/*
** 2001 September 15
**
** The author disclaims copyright to this source code.  In place of
** a legal notice, here is a blessing:
**
**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This header file defines the interface that the SQLite library
** presents to client programs.  If a C-function, structure, datatype,
** or constant definition does not appear in this file, then it is
** not a published API of SQLite, is subject to change without
** notice, and should not be referenced by programs that use SQLite.
**
** Some of the definitions that are in this file are marked as
** "experimental".  Experimental interfaces are normally new
** features recently added to SQLite.  We do not anticipate changes
** to experimental interfaces but reserve the right to make minor changes
** if experience from use "in the wild" suggest such changes are prudent.
**
** The official C-language API documentation for SQLite is derived
** from comments in this file.  This file is the authoritative source
** on how SQLite interfaces are suppose to operate.
**
** The name of this file under configuration management is "sqlite.h.in".
** The makefile makes some minor changes to this file (such as inserting
** the version number) and changes its name to "sqlite3.h" as
** part of the build process.
*/
#ifndef _SQLITE3_H_
#define _SQLITE3_H_
#include <stdarg.h>     /* Needed for the definition of va_list */

/*
** Make sure we can call this stuff from C++.
*/
#ifdef __cplusplus
extern "C" {
#endif


/*
** Add the ability to override 'extern'
*/
#ifndef SQLITE_EXTERN
# define SQLITE_EXTERN extern
#endif

#ifndef SQLITE_API
# define SQLITE_API
#endif


/*
** These no-op macros are used in front of interfaces to mark those
** interfaces as either deprecated or experimental.  New applications
** should not use deprecated interfaces - they are support for backwards
** compatibility only.  Application writers should be aware that
** experimental interfaces are subject to change in point releases.
**
** These macros used to resolve to various kinds of compiler magic that
** would generate warning messages when they were used.  But that
** compiler magic ended up generating such a flurry of bug reports
** that we have taken it all out and gone back to using simple
** noop macros.
*/
#define SQLITE_DEPRECATED
#define SQLITE_EXPERIMENTAL

/*
** Ensure these symbols were not defined by some previous header file.
*/
#ifdef SQLITE_VERSION
# undef SQLITE_VERSION
#endif
#ifdef SQLITE_VERSION_NUMBER
# undef SQLITE_VERSION_NUMBER
#endif

/*
** CAPI3REF: Compile-Time Library Version Numbers
**
** ^(The [SQLITE_VERSION] C preprocessor macro in the sqlite3.h header
** evaluates to a string literal that is the SQLite version in the
** format "X.Y.Z" where X is the major version number (always 3 for
** SQLite3) and Y is the minor version number and Z is the release number.)^
** ^(The [SQLITE_VERSION_NUMBER] C preprocessor macro resolves to an integer
** with the value (X*1000000 + Y*1000 + Z) where X, Y, and Z are the same
** numbers used in [SQLITE_VERSION].)^
** The SQLITE_VERSION_NUMBER for any given release of SQLite will also
** be larger than the release from which it is derived.  Either Y will
** be held constant and Z will be incremented or else Y will be incremented
** and Z will be reset to zero.
**
** Since version 3.6.18, SQLite source code has been stored in the
** <a href="http://www.fossil-scm.org/">Fossil configuration management
** system</a>.  ^The SQLITE_SOURCE_ID macro evaluates to
** a string which identifies a particular check-in of SQLite
** within its configuration management system.  ^The SQLITE_SOURCE_ID
** string contains the date and time of the check-in (UTC) and an SHA1
** hash of the entire source tree.
**
** See also: [sqlite3_libversion()],
** [sqlite3_libversion_number()], [sqlite3_sourceid()],
** [sqlite_version()] and [sqlite_source_id()].
*/
#define SQLITE_VERSION        "3.7.7.1"
#define SQLITE_VERSION_NUMBER 3007007
#define SQLITE_SOURCE_ID      "2011-06-28 17:39:05 af0d91adf497f5f36ec3813f04235a6e195a605f"

/*
** CAPI3REF: Run-Time Library Version Numbers
** KEYWORDS: sqlite3_version, sqlite3_sourceid
**
** These interfaces provide the same information as the [SQLITE_VERSION],
** [SQLITE_VERSION_NUMBER], and [SQLITE_SOURCE_ID] C preprocessor macros
** but are associated with the library instead of the header file.  ^(Cautious
** programmers might include assert() statements in their application to
** verify that values returned by these interfaces match the macros in
** the header, and thus insure that the application is
** compiled with matching library and header files.
**
** <blockquote><pre>
** assert( sqlite3_libversion_number()==SQLITE_VERSION_NUMBER );
** assert( strcmp(sqlite3_sourceid(),SQLITE_SOURCE_ID)==0 );
** assert( strcmp(sqlite3_libversion(),SQLITE_VERSION)==0 );
** </pre></blockquote>)^
**
** ^The sqlite3_version[] string constant contains the text of [SQLITE_VERSION]
** macro.  ^The sqlite3_libversion() function returns a pointer to the
** to the sqlite3_version[] string constant.  The sqlite3_libversion()
** function is provided for use in DLLs since DLL users usually do not have
** direct access to string constants within the DLL.  ^The
** sqlite3_libversion_number() function returns an integer equal to
** [SQLITE_VERSION_NUMBER].  ^The sqlite3_sourceid() function returns 
** a pointer to a string constant whose value is the same as the 
** [SQLITE_SOURCE_ID] C preprocessor macro.
**
** See also: [sqlite_version()] and [sqlite_source_id()].
*/
SQLITE_API SQLITE_EXTERN const char sqlite3_version[];
SQLITE_API const char *sqlite3_libversion(void);
SQLITE_API const char *sqlite3_sourceid(void);
SQLITE_API int sqlite3_libversion_number(void);

/*
** CAPI3REF: Run-Time Library Compilation Options Diagnostics
**
** ^The sqlite3_compileoption_used() function returns 0 or 1 
** indicating whether the specified option was defined at 
** compile time.  ^The SQLITE_ prefix may be omitted from the 
** option name passed to sqlite3_compileoption_used().  
**
** ^The sqlite3_compileoption_get() function allows iterating
** over the list of options that were defined at compile time by
** returning the N-th compile time option string.  ^If N is out of range,
** sqlite3_compileoption_get() returns a NULL pointer.  ^The SQLITE_ 
** prefix is omitted from any strings returned by 
** sqlite3_compileoption_get().
**
** ^Support for the diagnostic functions sqlite3_compileoption_used()
** and sqlite3_compileoption_get() may be omitted by specifying the 
** [SQLITE_OMIT_COMPILEOPTION_DIAGS] option at compile time.
**
** See also: SQL functions [sqlite_compileoption_used()] and
** [sqlite_compileoption_get()] and the [compile_options pragma].
*/
#ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS
SQLITE_API int sqlite3_compileoption_used(const char *zOptName);
SQLITE_API const char *sqlite3_compileoption_get(int N);
#endif

/*
** CAPI3REF: Test To See If The Library Is Threadsafe
**
** ^The sqlite3_threadsafe() function returns zero if and only if
** SQLite was compiled mutexing code omitted due to the
** [SQLITE_THREADSAFE] compile-time option being set to 0.
**
** SQLite can be compiled with or without mutexes.  When
** the [SQLITE_THREADSAFE] C preprocessor macro is 1 or 2, mutexes
** are enabled and SQLite is threadsafe.  When the
** [SQLITE_THREADSAFE] macro is 0, 
** the mutexes are omitted.  Without the mutexes, it is not safe
** to use SQLite concurrently from more than one thread.
**
** Enabling mutexes incurs a measurable performance penalty.
** So if speed is of utmost importance, it makes sense to disable
** the mutexes.  But for maximum safety, mutexes should be enabled.
** ^The default behavior is for mutexes to be enabled.
**
** This interface can be used by an application to make sure that the
** version of SQLite that it is linking against was compiled with
** the desired setting of the [SQLITE_THREADSAFE] macro.
**
** This interface only reports on the compile-time mutex setting
** of the [SQLITE_THREADSAFE] flag.  If SQLite is compiled with
** SQLITE_THREADSAFE=1 or =2 then mutexes are enabled by default but
** can be fully or partially disabled using a call to [sqlite3_config()]
** with the verbs [SQLITE_CONFIG_SINGLETHREAD], [SQLITE_CONFIG_MULTITHREAD],
** or [SQLITE_CONFIG_MUTEX].  ^(The return value of the
** sqlite3_threadsafe() function shows only the compile-time setting of
** thread safety, not any run-time changes to that setting made by
** sqlite3_config(). In other words, the return value from sqlite3_threadsafe()
** is unchanged by calls to sqlite3_config().)^
**
** See the [threading mode] documentation for additional information.
*/
SQLITE_API int sqlite3_threadsafe(void);

/*
** CAPI3REF: Database Connection Handle
** KEYWORDS: {database connection} {database connections}
**
** Each open SQLite database is represented by a pointer to an instance of
** the opaque structure named "sqlite3".  It is useful to think of an sqlite3
** pointer as an object.  The [sqlite3_open()], [sqlite3_open16()], and
** [sqlite3_open_v2()] interfaces are its constructors, and [sqlite3_close()]
** is its destructor.  There are many other interfaces (such as
** [sqlite3_prepare_v2()], [sqlite3_create_function()], and
** [sqlite3_busy_timeout()] to name but three) that are methods on an
** sqlite3 object.
*/
typedef struct sqlite3 sqlite3;

/*
** CAPI3REF: 64-Bit Integer Types
** KEYWORDS: sqlite_int64 sqlite_uint64
**
** Because there is no cross-platform way to specify 64-bit integer types
** SQLite includes typedefs for 64-bit signed and unsigned integers.
**
** The sqlite3_int64 and sqlite3_uint64 are the preferred type definitions.
** The sqlite_int64 and sqlite_uint64 types are supported for backwards
** compatibility only.
**
** ^The sqlite3_int64 and sqlite_int64 types can store integer values
** between -9223372036854775808 and +9223372036854775807 inclusive.  ^The
** sqlite3_uint64 and sqlite_uint64 types can store integer values 
** between 0 and +18446744073709551615 inclusive.
*/
#ifdef SQLITE_INT64_TYPE
  typedef SQLITE_INT64_TYPE sqlite_int64;
  typedef unsigned SQLITE_INT64_TYPE sqlite_uint64;
#elif defined(_MSC_VER) || defined(__BORLANDC__)
  typedef __int64 sqlite_int64;
  typedef unsigned __int64 sqlite_uint64;
#else
  typedef long long int sqlite_int64;
  typedef unsigned long long int sqlite_uint64;
#endif
typedef sqlite_int64 sqlite3_int64;
typedef sqlite_uint64 sqlite3_uint64;

/*
** If compiling for a processor that lacks floating point support,
** substitute integer for floating-point.
*/
#ifdef SQLITE_OMIT_FLOATING_POINT
# define double sqlite3_int64
#endif

/*
** CAPI3REF: Closing A Database Connection
**
** ^The sqlite3_close() routine is the destructor for the [sqlite3] object.
** ^Calls to sqlite3_close() return SQLITE_OK if the [sqlite3] object is
** successfully destroyed and all associated resources are deallocated.
**
** Applications must [sqlite3_finalize | finalize] all [prepared statements]
** and [sqlite3_blob_close | close] all [BLOB handles] associated with
** the [sqlite3] object prior to attempting to close the object.  ^If
** sqlite3_close() is called on a [database connection] that still has
** outstanding [prepared statements] or [BLOB handles], then it returns
** SQLITE_BUSY.
**
** ^If [sqlite3_close()] is invoked while a transaction is open,
** the transaction is automatically rolled back.
**
** The C parameter to [sqlite3_close(C)] must be either a NULL
** pointer or an [sqlite3] object pointer obtained
** from [sqlite3_open()], [sqlite3_open16()], or
** [sqlite3_open_v2()], and not previously closed.
** ^Calling sqlite3_close() with a NULL pointer argument is a 
** harmless no-op.
*/
SQLITE_API int sqlite3_close(sqlite3 *);

/*
** The type for a callback function.
** This is legacy and deprecated.  It is included for historical
** compatibility and is not documented.
*/
typedef int (*sqlite3_callback)(void*,int,char**, char**);

/*
** CAPI3REF: One-Step Query Execution Interface
**
** The sqlite3_exec() interface is a convenience wrapper around
** [sqlite3_prepare_v2()], [sqlite3_step()], and [sqlite3_finalize()],
** that allows an application to run multiple statements of SQL
** without having to use a lot of C code. 
**
** ^The sqlite3_exec() interface runs zero or more UTF-8 encoded,
** semicolon-separate SQL statements passed into its 2nd argument,
** in the context of the [database connection] passed in as its 1st
** argument.  ^If the callback function of the 3rd argument to
** sqlite3_exec() is not NULL, then it is invoked for each result row
** coming out of the evaluated SQL statements.  ^The 4th argument to
** sqlite3_exec() is relayed through to the 1st argument of each
** callback invocation.  ^If the callback pointer to sqlite3_exec()
** is NULL, then no callback is ever invoked and result rows are
** ignored.
**
** ^If an error occurs while evaluating the SQL statements passed into
** sqlite3_exec(), then execution of the current statement stops and
** subsequent statements are skipped.  ^If the 5th parameter to sqlite3_exec()
** is not NULL then any error message is written into memory obtained
** from [sqlite3_malloc()] and passed back through the 5th parameter.
** To avoid memory leaks, the application should invoke [sqlite3_free()]
** on error message strings returned through the 5th parameter of
** of sqlite3_exec() after the error message string is no longer needed.
** ^If the 5th parameter to sqlite3_exec() is not NULL and no errors
** occur, then sqlite3_exec() sets the pointer in its 5th parameter to
** NULL before returning.
**
** ^If an sqlite3_exec() callback returns non-zero, the sqlite3_exec()
** routine returns SQLITE_ABORT without invoking the callback again and
** without running any subsequent SQL statements.
**
** ^The 2nd argument to the sqlite3_exec() callback function is the
** number of columns in the result.  ^The 3rd argument to the sqlite3_exec()
** callback is an array of pointers to strings obtained as if from
** [sqlite3_column_text()], one for each column.  ^If an element of a
** result row is NULL then the corresponding string pointer for the
** sqlite3_exec() callback is a NULL pointer.  ^The 4th argument to the
** sqlite3_exec() callback is an array of pointers to strings where each
** entry represents the name of corresponding result column as obtained
** from [sqlite3_column_name()].
**
** ^If the 2nd parameter to sqlite3_exec() is a NULL pointer, a pointer
** to an empty string, or a pointer that contains only whitespace and/or 
** SQL comments, then no SQL statements are evaluated and the database
** is not changed.
**
** Restrictions:
**
** <ul>
** <li> The application must insure that the 1st parameter to sqlite3_exec()
**      is a valid and open [database connection].
** <li> The application must not close [database connection] specified by
**      the 1st parameter to sqlite3_exec() while sqlite3_exec() is running.
** <li> The application must not modify the SQL statement text passed into
**      the 2nd parameter of sqlite3_exec() while sqlite3_exec() is running.
** </ul>
*/
SQLITE_API int sqlite3_exec(
  sqlite3*,                                  /* An open database */
  const char *sql,                           /* SQL to be evaluated */
  int (*callback)(void*,int,char**,char**),  /* Callback function */
  void *,                                    /* 1st argument to callback */
  char **errmsg                              /* Error msg written here */
);

/*
** CAPI3REF: Result Codes
** KEYWORDS: SQLITE_OK {error code} {error codes}
** KEYWORDS: {result code} {result codes}
**
** Many SQLite functions return an integer result code from the set shown
** here in order to indicates success or failure.
**
** New error codes may be added in future versions of SQLite.
**
** See also: [SQLITE_IOERR_READ | extended result codes],
** [sqlite3_vtab_on_conflict()] [SQLITE_ROLLBACK | result codes].
*/
#define SQLITE_OK           0   /* Successful result */
/* beginning-of-error-codes */
#define SQLITE_ERROR        1   /* SQL error or missing database */
#define SQLITE_INTERNAL     2   /* Internal logic error in SQLite */
#define SQLITE_PERM         3   /* Access permission denied */
#define SQLITE_ABORT        4   /* Callback routine requested an abort */
#define SQLITE_BUSY         5   /* The database file is locked */
#define SQLITE_LOCKED       6   /* A table in the database is locked */
#define SQLITE_NOMEM        7   /* A malloc() failed */
#define SQLITE_READONLY     8   /* Attempt to write a readonly database */
#define SQLITE_INTERRUPT    9   /* Operation terminated by sqlite3_interrupt()*/
#define SQLITE_IOERR       10   /* Some kind of disk I/O error occurred */
#define SQLITE_CORRUPT     11   /* The database disk image is malformed */
#define SQLITE_NOTFOUND    12   /* Unknown opcode in sqlite3_file_control() */
#define SQLITE_FULL        13   /* Insertion failed because database is full */
#define SQLITE_CANTOPEN    14   /* Unable to open the database file */
#define SQLITE_PROTOCOL    15   /* Database lock protocol error */
#define SQLITE_EMPTY       16   /* Database is empty */
#define SQLITE_SCHEMA      17   /* The database schema changed */
#define SQLITE_TOOBIG      18   /* String or BLOB exceeds size limit */
#define SQLITE_CONSTRAINT  19   /* Abort due to constraint violation */
#define SQLITE_MISMATCH    20   /* Data type mismatch */
#define SQLITE_MISUSE      21   /* Library used incorrectly */
#define SQLITE_NOLFS       22   /* Uses OS features not supported on host */
#define SQLITE_AUTH        23   /* Authorization denied */
#define SQLITE_FORMAT      24   /* Auxiliary database format error */
#define SQLITE_RANGE       25   /* 2nd parameter to sqlite3_bind out of range */
#define SQLITE_NOTADB      26   /* File opened that is not a database file */
#define SQLITE_ROW         100  /* sqlite3_step() has another row ready */
#define SQLITE_DONE        101  /* sqlite3_step() has finished executing */
/* end-of-error-codes */

/*
** CAPI3REF: Extended Result Codes
** KEYWORDS: {extended error code} {extended error codes}
** KEYWORDS: {extended result code} {extended result codes}
**
** In its default configuration, SQLite API routines return one of 26 integer
** [SQLITE_OK | result codes].  However, experience has shown that many of
** these result codes are too coarse-grained.  They do not provide as
** much information about problems as programmers might like.  In an effort to
** address this, newer versions of SQLite (version 3.3.8 and later) include
** support for additional result codes that provide more detailed information
** about errors. The extended result codes are enabled or disabled
** on a per database connection basis using the
** [sqlite3_extended_result_codes()] API.
**
** Some of the available extended result codes are listed here.
** One may expect the number of extended result codes will be expand
** over time.  Software that uses extended result codes should expect
** to see new result codes in future releases of SQLite.
**
** The SQLITE_OK result code will never be extended.  It will always
** be exactly zero.
*/
#define SQLITE_IOERR_READ              (SQLITE_IOERR | (1<<8))
#define SQLITE_IOERR_SHORT_READ        (SQLITE_IOERR | (2<<8))
#define SQLITE_IOERR_WRITE             (SQLITE_IOERR | (3<<8))
#define SQLITE_IOERR_FSYNC             (SQLITE_IOERR | (4<<8))
#define SQLITE_IOERR_DIR_FSYNC         (SQLITE_IOERR | (5<<8))
#define SQLITE_IOERR_TRUNCATE          (SQLITE_IOERR | (6<<8))
#define SQLITE_IOERR_FSTAT             (SQLITE_IOERR | (7<<8))
#define SQLITE_IOERR_UNLOCK            (SQLITE_IOERR | (8<<8))
#define SQLITE_IOERR_RDLOCK            (SQLITE_IOERR | (9<<8))
#define SQLITE_IOERR_DELETE            (SQLITE_IOERR | (10<<8))
#define SQLITE_IOERR_BLOCKED           (SQLITE_IOERR | (11<<8))
#define SQLITE_IOERR_NOMEM             (SQLITE_IOERR | (12<<8))
#define SQLITE_IOERR_ACCESS            (SQLITE_IOERR | (13<<8))
#define SQLITE_IOERR_CHECKRESERVEDLOCK (SQLITE_IOERR | (14<<8))
#define SQLITE_IOERR_LOCK              (SQLITE_IOERR | (15<<8))
#define SQLITE_IOERR_CLOSE             (SQLITE_IOERR | (16<<8))
#define SQLITE_IOERR_DIR_CLOSE         (SQLITE_IOERR | (17<<8))
#define SQLITE_IOERR_SHMOPEN           (SQLITE_IOERR | (18<<8))
#define SQLITE_IOERR_SHMSIZE           (SQLITE_IOERR | (19<<8))
#define SQLITE_IOERR_SHMLOCK           (SQLITE_IOERR | (20<<8))
#define SQLITE_IOERR_SHMMAP            (SQLITE_IOERR | (21<<8))
#define SQLITE_IOERR_SEEK              (SQLITE_IOERR | (22<<8))
#define SQLITE_LOCKED_SHAREDCACHE      (SQLITE_LOCKED |  (1<<8))
#define SQLITE_BUSY_RECOVERY           (SQLITE_BUSY   |  (1<<8))
#define SQLITE_CANTOPEN_NOTEMPDIR      (SQLITE_CANTOPEN | (1<<8))
#define SQLITE_CORRUPT_VTAB            (SQLITE_CORRUPT | (1<<8))
#define SQLITE_READONLY_RECOVERY       (SQLITE_READONLY | (1<<8))
#define SQLITE_READONLY_CANTLOCK       (SQLITE_READONLY | (2<<8))

/*
** CAPI3REF: Flags For File Open Operations
**
** These bit values are intended for use in the
** 3rd parameter to the [sqlite3_open_v2()] interface and
** in the 4th parameter to the [sqlite3_vfs.xOpen] method.
*/
#define SQLITE_OPEN_READONLY         0x00000001  /* Ok for sqlite3_open_v2() */
#define SQLITE_OPEN_READWRITE        0x00000002  /* Ok for sqlite3_open_v2() */
#define SQLITE_OPEN_CREATE           0x00000004  /* Ok for sqlite3_open_v2() */
#define SQLITE_OPEN_DELETEONCLOSE    0x00000008  /* VFS only */
#define SQLITE_OPEN_EXCLUSIVE        0x00000010  /* VFS only */
#define SQLITE_OPEN_AUTOPROXY        0x00000020  /* VFS only */
#define SQLITE_OPEN_URI              0x00000040  /* Ok for sqlite3_open_v2() */
#define SQLITE_OPEN_MAIN_DB          0x00000100  /* VFS only */
#define SQLITE_OPEN_TEMP_DB          0x00000200  /* VFS only */
#define SQLITE_OPEN_TRANSIENT_DB     0x00000400  /* VFS only */
#define SQLITE_OPEN_MAIN_JOURNAL     0x00000800  /* VFS only */
#define SQLITE_OPEN_TEMP_JOURNAL     0x00001000  /* VFS only */
#define SQLITE_OPEN_SUBJOURNAL       0x00002000  /* VFS only */
#define SQLITE_OPEN_MASTER_JOURNAL   0x00004000  /* VFS only */
#define SQLITE_OPEN_NOMUTEX          0x00008000  /* Ok for sqlite3_open_v2() */
#define SQLITE_OPEN_FULLMUTEX        0x00010000  /* Ok for sqlite3_open_v2() */
#define SQLITE_OPEN_SHAREDCACHE      0x00020000  /* Ok for sqlite3_open_v2() */
#define SQLITE_OPEN_PRIVATECACHE     0x00040000  /* Ok for sqlite3_open_v2() */
#define SQLITE_OPEN_WAL              0x00080000  /* VFS only */

/* Reserved:                         0x00F00000 */

/*
** CAPI3REF: Device Characteristics
**
** The xDeviceCharacteristics method of the [sqlite3_io_methods]
** object returns an integer which is a vector of the these
** bit values expressing I/O characteristics of the mass storage
** device that holds the file that the [sqlite3_io_methods]
** refers to.
**
** The SQLITE_IOCAP_ATOMIC property means that all writes of
** any size are atomic.  The SQLITE_IOCAP_ATOMICnnn values
** mean that writes of blocks that are nnn bytes in size and
** are aligned to an address which is an integer multiple of
** nnn are atomic.  The SQLITE_IOCAP_SAFE_APPEND value means
** that when data is appended to a file, the data is appended
** first then the size of the file is extended, never the other
** way around.  The SQLITE_IOCAP_SEQUENTIAL property means that
** information is written to disk in the same order as calls
** to xWrite().
*/
#define SQLITE_IOCAP_ATOMIC                 0x00000001
#define SQLITE_IOCAP_ATOMIC512              0x00000002
#define SQLITE_IOCAP_ATOMIC1K               0x00000004
#define SQLITE_IOCAP_ATOMIC2K               0x00000008
#define SQLITE_IOCAP_ATOMIC4K               0x00000010
#define SQLITE_IOCAP_ATOMIC8K               0x00000020
#define SQLITE_IOCAP_ATOMIC16K              0x00000040
#define SQLITE_IOCAP_ATOMIC32K              0x00000080
#define SQLITE_IOCAP_ATOMIC64K              0x00000100
#define SQLITE_IOCAP_SAFE_APPEND            0x00000200
#define SQLITE_IOCAP_SEQUENTIAL             0x00000400
#define SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN  0x00000800

/*
** CAPI3REF: File Locking Levels
**
** SQLite uses one of these integer values as the second
** argument to calls it makes to the xLock() and xUnlock() methods
** of an [sqlite3_io_methods] object.
*/
#define SQLITE_LOCK_NONE          0
#define SQLITE_LOCK_SHARED        1
#define SQLITE_LOCK_RESERVED      2
#define SQLITE_LOCK_PENDING       3
#define SQLITE_LOCK_EXCLUSIVE     4

/*
** CAPI3REF: Synchronization Type Flags
**
** When SQLite invokes the xSync() method of an
** [sqlite3_io_methods] object it uses a combination of
** these integer values as the second argument.
**
** When the SQLITE_SYNC_DATAONLY flag is used, it means that the
** sync operation only needs to flush data to mass storage.  Inode
** information need not be flushed. If the lower four bits of the flag
** equal SQLITE_SYNC_NORMAL, that means to use normal fsync() semantics.
** If the lower four bits equal SQLITE_SYNC_FULL, that means
** to use Mac OS X style fullsync instead of fsync().
**
** Do not confuse the SQLITE_SYNC_NORMAL and SQLITE_SYNC_FULL flags
** with the [PRAGMA synchronous]=NORMAL and [PRAGMA synchronous]=FULL
** settings.  The [synchronous pragma] determines when calls to the
** xSync VFS method occur and applies uniformly across all platforms.
** The SQLITE_SYNC_NORMAL and SQLITE_SYNC_FULL flags determine how
** energetic or rigorous or forceful the sync operations are and
** only make a difference on Mac OSX for the default SQLite code.
** (Third-party VFS implementations might also make the distinction
** between SQLITE_SYNC_NORMAL and SQLITE_SYNC_FULL, but among the
** operating systems natively supported by SQLite, only Mac OSX
** cares about the difference.)
*/
#define SQLITE_SYNC_NORMAL        0x00002
#define SQLITE_SYNC_FULL          0x00003
#define SQLITE_SYNC_DATAONLY      0x00010

/*
** CAPI3REF: OS Interface Open File Handle
**
** An [sqlite3_file] object represents an open file in the 
** [sqlite3_vfs | OS interface layer].  Individual OS interface
** implementations will
** want to subclass this object by appending additional fields
** for their own use.  The pMethods entry is a pointer to an
** [sqlite3_io_methods] object that defines methods for performing
** I/O operations on the open file.
*/
typedef struct sqlite3_file sqlite3_file;
struct sqlite3_file {
  const struct sqlite3_io_methods *pMethods;  /* Methods for an open file */
};

/*
** CAPI3REF: OS Interface File Virtual Methods Object
**
** Every file opened by the [sqlite3_vfs.xOpen] method populates an
** [sqlite3_file] object (or, more commonly, a subclass of the
** [sqlite3_file] object) with a pointer to an instance of this object.
** This object defines the methods used to perform various operations
** against the open file represented by the [sqlite3_file] object.
**
** If the [sqlite3_vfs.xOpen] method sets the sqlite3_file.pMethods element 
** to a non-NULL pointer, then the sqlite3_io_methods.xClose method
** may be invoked even if the [sqlite3_vfs.xOpen] reported that it failed.  The
** only way to prevent a call to xClose following a failed [sqlite3_vfs.xOpen]
** is for the [sqlite3_vfs.xOpen] to set the sqlite3_file.pMethods element
** to NULL.
**
** The flags argument to xSync may be one of [SQLITE_SYNC_NORMAL] or
** [SQLITE_SYNC_FULL].  The first choice is the normal fsync().
** The second choice is a Mac OS X style fullsync.  The [SQLITE_SYNC_DATAONLY]
** flag may be ORed in to indicate that only the data of the file
** and not its inode needs to be synced.
**
** The integer values to xLock() and xUnlock() are one of
** <ul>
** <li> [SQLITE_LOCK_NONE],
** <li> [SQLITE_LOCK_SHARED],
** <li> [SQLITE_LOCK_RESERVED],
** <li> [SQLITE_LOCK_PENDING], or
** <li> [SQLITE_LOCK_EXCLUSIVE].
** </ul>
** xLock() increases the lock. xUnlock() decreases the lock.
** The xCheckReservedLock() method checks whether any database connection,
** either in this process or in some other process, is holding a RESERVED,
** PENDING, or EXCLUSIVE lock on the file.  It returns true
** if such a lock exists and false otherwise.
**
** The xFileControl() method is a generic interface that allows custom
** VFS implementations to directly control an open file using the
** [sqlite3_file_control()] interface.  The second "op" argument is an
** integer opcode.  The third argument is a generic pointer intended to
** point to a structure that may contain arguments or space in which to
** write return values.  Potential uses for xFileControl() might be
** functions to enable blocking locks with timeouts, to change the
** locking strategy (for example to use dot-file locks), to inquire
** about the status of a lock, or to break stale locks.  The SQLite
** core reserves all opcodes less than 100 for its own use.
** A [SQLITE_FCNTL_LOCKSTATE | list of opcodes] less than 100 is available.
** Applications that define a custom xFileControl method should use opcodes
** greater than 100 to avoid conflicts.  VFS implementations should
** return [SQLITE_NOTFOUND] for file control opcodes that they do not
** recognize.
**
** The xSectorSize() method returns the sector size of the
** device that underlies the file.  The sector size is the
** minimum write that can be performed without disturbing
** other bytes in the file.  The xDeviceCharacteristics()
** method returns a bit vector describing behaviors of the
** underlying device:
**
** <ul>
** <li> [SQLITE_IOCAP_ATOMIC]
** <li> [SQLITE_IOCAP_ATOMIC512]
** <li> [SQLITE_IOCAP_ATOMIC1K]
** <li> [SQLITE_IOCAP_ATOMIC2K]
** <li> [SQLITE_IOCAP_ATOMIC4K]
** <li> [SQLITE_IOCAP_ATOMIC8K]
** <li> [SQLITE_IOCAP_ATOMIC16K]
** <li> [SQLITE_IOCAP_ATOMIC32K]
** <li> [SQLITE_IOCAP_ATOMIC64K]
** <li> [SQLITE_IOCAP_SAFE_APPEND]
** <li> [SQLITE_IOCAP_SEQUENTIAL]
** </ul>
**
** The SQLITE_IOCAP_ATOMIC property means that all writes of
** any size are atomic.  The SQLITE_IOCAP_ATOMICnnn values
** mean that writes of blocks that are nnn bytes in size and
** are aligned to an address which is an integer multiple of
** nnn are atomic.  The SQLITE_IOCAP_SAFE_APPEND value means
** that when data is appended to a file, the data is appended
** first then the size of the file is extended, never the other
** way around.  The SQLITE_IOCAP_SEQUENTIAL property means that
** information is written to disk in the same order as calls
** to xWrite().
**
** If xRead() returns SQLITE_IOERR_SHORT_READ it must also fill
** in the unread portions of the buffer with zeros.  A VFS that
** fails to zero-fill short reads might seem to work.  However,
** failure to zero-fill short reads will eventually lead to
** database corruption.
*/
typedef struct sqlite3_io_methods sqlite3_io_methods;
struct sqlite3_io_methods {
  int iVersion;
  int (*xClose)(sqlite3_file*);
  int (*xRead)(sqlite3_file*, void*, int iAmt, sqlite3_int64 iOfst);
  int (*xWrite)(sqlite3_file*, const void*, int iAmt, sqlite3_int64 iOfst);
  int (*xTruncate)(sqlite3_file*, sqlite3_int64 size);
  int (*xSync)(sqlite3_file*, int flags);
  int (*xFileSize)(sqlite3_file*, sqlite3_int64 *pSize);
  int (*xLock)(sqlite3_file*, int);
  int (*xUnlock)(sqlite3_file*, int);
  int (*xCheckReservedLock)(sqlite3_file*, int *pResOut);
  int (*xFileControl)(sqlite3_file*, int op, void *pArg);
  int (*xSectorSize)(sqlite3_file*);
  int (*xDeviceCharacteristics)(sqlite3_file*);
  /* Methods above are valid for version 1 */
  int (*xShmMap)(sqlite3_file*, int iPg, int pgsz, int, void volatile**);
  int (*xShmLock)(sqlite3_file*, int offset, int n, int flags);
  void (*xShmBarrier)(sqlite3_file*);
  int (*xShmUnmap)(sqlite3_file*, int deleteFlag);
  /* Methods above are valid for version 2 */
  /* Additional methods may be added in future releases */
};

/*
** CAPI3REF: Standard File Control Opcodes
**
** These integer constants are opcodes for the xFileControl method
** of the [sqlite3_io_methods] object and for the [sqlite3_file_control()]
** interface.
**
** The [SQLITE_FCNTL_LOCKSTATE] opcode is used for debugging.  This
** opcode causes the xFileControl method to write the current state of
** the lock (one of [SQLITE_LOCK_NONE], [SQLITE_LOCK_SHARED],
** [SQLITE_LOCK_RESERVED], [SQLITE_LOCK_PENDING], or [SQLITE_LOCK_EXCLUSIVE])
** into an integer that the pArg argument points to. This capability
** is used during testing and only needs to be supported when SQLITE_TEST
** is defined.
**
** The [SQLITE_FCNTL_SIZE_HINT] opcode is used by SQLite to give the VFS
** layer a hint of how large the database file will grow to be during the
** current transaction.  This hint is not guaranteed to be accurate but it
** is often close.  The underlying VFS might choose to preallocate database
** file space based on this hint in order to help writes to the database
** file run faster.
**
** The [SQLITE_FCNTL_CHUNK_SIZE] opcode is used to request that the VFS
** extends and truncates the database file in chunks of a size specified
** by the user. The fourth argument to [sqlite3_file_control()] should 
** point to an integer (type int) containing the new chunk-size to use
** for the nominated database. Allocating database file space in large
** chunks (say 1MB at a time), may reduce file-system fragmentation and
** improve performance on some systems.
**
** The [SQLITE_FCNTL_FILE_POINTER] opcode is used to obtain a pointer
** to the [sqlite3_file] object associated with a particular database
** connection.  See the [sqlite3_file_control()] documentation for
** additional information.
**
** ^(The [SQLITE_FCNTL_SYNC_OMITTED] opcode is generated internally by
** SQLite and sent to all VFSes in place of a call to the xSync method
** when the database connection has [PRAGMA synchronous] set to OFF.)^
** Some specialized VFSes need this signal in order to operate correctly
** when [PRAGMA synchronous | PRAGMA synchronous=OFF] is set, but most 
** VFSes do not need this signal and should silently ignore this opcode.
** Applications should not call [sqlite3_file_control()] with this
** opcode as doing so may disrupt the operation of the specialized VFSes
** that do require it.  
*/
#define SQLITE_FCNTL_LOCKSTATE        1
#define SQLITE_GET_LOCKPROXYFILE      2
#define SQLITE_SET_LOCKPROXYFILE      3
#define SQLITE_LAST_ERRNO             4
#define SQLITE_FCNTL_SIZE_HINT        5
#define SQLITE_FCNTL_CHUNK_SIZE       6
#define SQLITE_FCNTL_FILE_POINTER     7
#define SQLITE_FCNTL_SYNC_OMITTED     8


/*
** CAPI3REF: Mutex Handle
**
** The mutex module within SQLite defines [sqlite3_mutex] to be an
** abstract type for a mutex object.  The SQLite core never looks
** at the internal representation of an [sqlite3_mutex].  It only
** deals with pointers to the [sqlite3_mutex] object.
**
** Mutexes are created using [sqlite3_mutex_alloc()].
*/
typedef struct sqlite3_mutex sqlite3_mutex;

/*
** CAPI3REF: OS Interface Object
**
** An instance of the sqlite3_vfs object defines the interface between
** the SQLite core and the underlying operating system.  The "vfs"
** in the name of the object stands for "virtual file system".  See
** the [VFS | VFS documentation] for further information.
**
** The value of the iVersion field is initially 1 but may be larger in
** future versions of SQLite.  Additional fields may be appended to this
** object when the iVersion value is increased.  Note that the structure
** of the sqlite3_vfs object changes in the transaction between
** SQLite version 3.5.9 and 3.6.0 and yet the iVersion field was not
** modified.
**
** The szOsFile field is the size of the subclassed [sqlite3_file]
** structure used by this VFS.  mxPathname is the maximum length of
** a pathname in this VFS.
**
** Registered sqlite3_vfs objects are kept on a linked list formed by
** the pNext pointer.  The [sqlite3_vfs_register()]
** and [sqlite3_vfs_unregister()] interfaces manage this list
** in a thread-safe way.  The [sqlite3_vfs_find()] interface
** searches the list.  Neither the application code nor the VFS
** implementation should use the pNext pointer.
**
** The pNext field is the only field in the sqlite3_vfs
** structure that SQLite will ever modify.  SQLite will only access
** or modify this field while holding a particular static mutex.
** The application should never modify anything within the sqlite3_vfs
** object once the object has been registered.
**
** The zName field holds the name of the VFS module.  The name must
** be unique across all VFS modules.
**
** [[sqlite3_vfs.xOpen]]
** ^SQLite guarantees that the zFilename parameter to xOpen
** is either a NULL pointer or string obtained
** from xFullPathname() with an optional suffix added.
** ^If a suffix is added to the zFilename parameter, it will
** consist of a single "-" character followed by no more than
** 10 alphanumeric and/or "-" characters.
** ^SQLite further guarantees that
** the string will be valid and unchanged until xClose() is
** called. Because of the previous sentence,
** the [sqlite3_file] can safely store a pointer to the
** filename if it needs to remember the filename for some reason.
** If the zFilename parameter to xOpen is a NULL pointer then xOpen
** must invent its own temporary name for the file.  ^Whenever the 
** xFilename parameter is NULL it will also be the case that the
** flags parameter will include [SQLITE_OPEN_DELETEONCLOSE].
**
** The flags argument to xOpen() includes all bits set in
** the flags argument to [sqlite3_open_v2()].  Or if [sqlite3_open()]
** or [sqlite3_open16()] is used, then flags includes at least
** [SQLITE_OPEN_READWRITE] | [SQLITE_OPEN_CREATE]. 
** If xOpen() opens a file read-only then it sets *pOutFlags to
** include [SQLITE_OPEN_READONLY].  Other bits in *pOutFlags may be set.
**
** ^(SQLite will also add one of the following flags to the xOpen()
** call, depending on the object being opened:
**
** <ul>
** <li>  [SQLITE_OPEN_MAIN_DB]
** <li>  [SQLITE_OPEN_MAIN_JOURNAL]
** <li>  [SQLITE_OPEN_TEMP_DB]
** <li>  [SQLITE_OPEN_TEMP_JOURNAL]
** <li>  [SQLITE_OPEN_TRANSIENT_DB]
** <li>  [SQLITE_OPEN_SUBJOURNAL]
** <li>  [SQLITE_OPEN_MASTER_JOURNAL]
** <li>  [SQLITE_OPEN_WAL]
** </ul>)^
**
** The file I/O implementation can use the object type flags to
** change the way it deals with files.  For example, an application
** that does not care about crash recovery or rollback might make
** the open of a journal file a no-op.  Writes to this journal would
** also be no-ops, and any attempt to read the journal would return
** SQLITE_IOERR.  Or the implementation might recognize that a database
** file will be doing page-aligned sector reads and writes in a random
** order and set up its I/O subsystem accordingly.
**
** SQLite might also add one of the following flags to the xOpen method:
**
** <ul>
** <li> [SQLITE_OPEN_DELETEONCLOSE]
** <li> [SQLITE_OPEN_EXCLUSIVE]
** </ul>
**
** The [SQLITE_OPEN_DELETEONCLOSE] flag means the file should be
** deleted when it is closed.  ^The [SQLITE_OPEN_DELETEONCLOSE]
** will be set for TEMP databases and their journals, transient
** databases, and subjournals.
**
** ^The [SQLITE_OPEN_EXCLUSIVE] flag is always used in conjunction
** with the [SQLITE_OPEN_CREATE] flag, which are both directly
** analogous to the O_EXCL and O_CREAT flags of the POSIX open()
** API.  The SQLITE_OPEN_EXCLUSIVE flag, when paired with the 
** SQLITE_OPEN_CREATE, is used to indicate that file should always
** be created, and that it is an error if it already exists.
** It is <i>not</i> used to indicate the file should be opened 
** for exclusive access.
**
** ^At least szOsFile bytes of memory are allocated by SQLite
** to hold the  [sqlite3_file] structure passed as the third
** argument to xOpen.  The xOpen method does not have to
** allocate the structure; it should just fill it in.  Note that
** the xOpen method must set the sqlite3_file.pMethods to either
** a valid [sqlite3_io_methods] object or to NULL.  xOpen must do
** this even if the open fails.  SQLite expects that the sqlite3_file.pMethods
** element will be valid after xOpen returns regardless of the success
** or failure of the xOpen call.
**
** [[sqlite3_vfs.xAccess]]
** ^The flags argument to xAccess() may be [SQLITE_ACCESS_EXISTS]
** to test for the existence of a file, or [SQLITE_ACCESS_READWRITE] to
** test whether a file is readable and writable, or [SQLITE_ACCESS_READ]
** to test whether a file is at least readable.   The file can be a
** directory.
**
** ^SQLite will always allocate at least mxPathname+1 bytes for the
** output buffer xFullPathname.  The exact size of the output buffer
** is also passed as a parameter to both  methods. If the output buffer
** is not large enough, [SQLITE_CANTOPEN] should be returned. Since this is
** handled as a fatal error by SQLite, vfs implementations should endeavor
** to prevent this by setting mxPathname to a sufficiently large value.
**
** The xRandomness(), xSleep(), xCurrentTime(), and xCurrentTimeInt64()
** interfaces are not strictly a part of the filesystem, but they are
** included in the VFS structure for completeness.
** The xRandomness() function attempts to return nBytes bytes
** of good-quality randomness into zOut.  The return value is
** the actual number of bytes of randomness obtained.
** The xSleep() method causes the calling thread to sleep for at
** least the number of microseconds given.  ^The xCurrentTime()
** method returns a Julian Day Number for the current date and time as
** a floating point value.
** ^The xCurrentTimeInt64() method returns, as an integer, the Julian
** Day Number multiplied by 86400000 (the number of milliseconds in 
** a 24-hour day).  
** ^SQLite will use the xCurrentTimeInt64() method to get the current
** date and time if that method is available (if iVersion is 2 or 
** greater and the function pointer is not NULL) and will fall back
** to xCurrentTime() if xCurrentTimeInt64() is unavailable.
**
** ^The xSetSystemCall(), xGetSystemCall(), and xNestSystemCall() interfaces
** are not used by the SQLite core.  These optional interfaces are provided
** by some VFSes to facilitate testing of the VFS code. By overriding 
** system calls with functions under its control, a test program can
** simulate faults and error conditions that would otherwise be difficult
** or impossible to induce.  The set of system calls that can be overridden
** varies from one VFS to another, and from one version of the same VFS to the
** next.  Applications that use these interfaces must be prepared for any
** or all of these interfaces to be NULL or for their behavior to change
** from one release to the next.  Applications must not attempt to access
** any of these methods if the iVersion of the VFS is less than 3.
*/
typedef struct sqlite3_vfs sqlite3_vfs;
typedef void (*sqlite3_syscall_ptr)(void);
struct sqlite3_vfs {
  int iVersion;            /* Structure version number (currently 3) */
  int szOsFile;            /* Size of subclassed sqlite3_file */
  int mxPathname;          /* Maximum file pathname length */
  sqlite3_vfs *pNext;      /* Next registered VFS */
  const char *zName;       /* Name of this virtual file system */
  void *pAppData;          /* Pointer to application-specific data */
  int (*xOpen)(sqlite3_vfs*, const char *zName, sqlite3_file*,
               int flags, int *pOutFlags);
  int (*xDelete)(sqlite3_vfs*, const char *zName, int syncDir);
  int (*xAccess)(sqlite3_vfs*, const char *zName, int flags, int *pResOut);
  int (*xFullPathname)(sqlite3_vfs*, const char *zName, int nOut, char *zOut);
  void *(*xDlOpen)(sqlite3_vfs*, const char *zFilename);
  void (*xDlError)(sqlite3_vfs*, int nByte, char *zErrMsg);
  void (*(*xDlSym)(sqlite3_vfs*,void*, const char *zSymbol))(void);
  void (*xDlClose)(sqlite3_vfs*, void*);
  int (*xRandomness)(sqlite3_vfs*, int nByte, char *zOut);
  int (*xSleep)(sqlite3_vfs*, int microseconds);
  int (*xCurrentTime)(sqlite3_vfs*, double*);
  int (*xGetLastError)(sqlite3_vfs*, int, char *);
  /*
  ** The methods above are in version 1 of the sqlite_vfs object
  ** definition.  Those that follow are added in version 2 or later
  */
  int (*xCurrentTimeInt64)(sqlite3_vfs*, sqlite3_int64*);
  /*
  ** The methods above are in versions 1 and 2 of the sqlite_vfs object.
  ** Those below are for version 3 and greater.
  */
  int (*xSetSystemCall)(sqlite3_vfs*, const char *zName, sqlite3_syscall_ptr);
  sqlite3_syscall_ptr (*xGetSystemCall)(sqlite3_vfs*, const char *zName);
  const char *(*xNextSystemCall)(sqlite3_vfs*, const char *zName);
  /*
  ** The methods above are in versions 1 through 3 of the sqlite_vfs object.
  ** New fields may be appended in figure versions.  The iVersion
  ** value will increment whenever this happens. 
  */
};

/*
** CAPI3REF: Flags for the xAccess VFS method
**
** These integer constants can be used as the third parameter to
** the xAccess method of an [sqlite3_vfs] object.  They determine
** what kind of permissions the xAccess method is looking for.
** With SQLITE_ACCESS_EXISTS, the xAccess method
** simply checks whether the file exists.
** With SQLITE_ACCESS_READWRITE, the xAccess method
** checks whether the named directory is both readable and writable
** (in other words, if files can be added, removed, and renamed within
** the directory).
** The SQLITE_ACCESS_READWRITE constant is currently used only by the
** [temp_store_directory pragma], though this could change in a future
** release of SQLite.
** With SQLITE_ACCESS_READ, the xAccess method
** checks whether the file is readable.  The SQLITE_ACCESS_READ constant is
** currently unused, though it might be used in a future release of
** SQLite.
*/
#define SQLITE_ACCESS_EXISTS    0
#define SQLITE_ACCESS_READWRITE 1   /* Used by PRAGMA temp_store_directory */
#define SQLITE_ACCESS_READ      2   /* Unused */

/*
** CAPI3REF: Flags for the xShmLock VFS method
**
** These integer constants define the various locking operations
** allowed by the xShmLock method of [sqlite3_io_methods].  The
** following are the only legal combinations of flags to the
** xShmLock method:
**
** <ul>
** <li>  SQLITE_SHM_LOCK | SQLITE_SHM_SHARED
** <li>  SQLITE_SHM_LOCK | SQLITE_SHM_EXCLUSIVE
** <li>  SQLITE_SHM_UNLOCK | SQLITE_SHM_SHARED
** <li>  SQLITE_SHM_UNLOCK | SQLITE_SHM_EXCLUSIVE
** </ul>
**
** When unlocking, the same SHARED or EXCLUSIVE flag must be supplied as
** was given no the corresponding lock.  
**
** The xShmLock method can transition between unlocked and SHARED or
** between unlocked and EXCLUSIVE.  It cannot transition between SHARED
** and EXCLUSIVE.
*/
#define SQLITE_SHM_UNLOCK       1
#define SQLITE_SHM_LOCK         2
#define SQLITE_SHM_SHARED       4
#define SQLITE_SHM_EXCLUSIVE    8

/*
** CAPI3REF: Maximum xShmLock index
**
** The xShmLock method on [sqlite3_io_methods] may use values
** between 0 and this upper bound as its "offset" argument.
** The SQLite core will never attempt to acquire or release a
** lock outside of this range
*/
#define SQLITE_SHM_NLOCK        8


/*
** CAPI3REF: Initialize The SQLite Library
**
** ^The sqlite3_initialize() routine initializes the
** SQLite library.  ^The sqlite3_shutdown() routine
** deallocates any resources that were allocated by sqlite3_initialize().
** These routines are designed to aid in process initialization and
** shutdown on embedded systems.  Workstation applications using
** SQLite normally do not need to invoke either of these routines.
**
** A call to sqlite3_initialize() is an "effective" call if it is
** the first time sqlite3_initialize() is invoked during the lifetime of
** the process, or if it is the first time sqlite3_initialize() is invoked
** following a call to sqlite3_shutdown().  ^(Only an effective call
** of sqlite3_initialize() does any initialization.  All other calls
** are harmless no-ops.)^
**
** A call to sqlite3_shutdown() is an "effective" call if it is the first
** call to sqlite3_shutdown() since the last sqlite3_initialize().  ^(Only
** an effective call to sqlite3_shutdown() does any deinitialization.
** All other valid calls to sqlite3_shutdown() are harmless no-ops.)^
**
** The sqlite3_initialize() interface is threadsafe, but sqlite3_shutdown()
** is not.  The sqlite3_shutdown() interface must only be called from a
** single thread.  All open [database connections] must be closed and all
** other SQLite resources must be deallocated prior to invoking
** sqlite3_shutdown().
**
** Among other things, ^sqlite3_initialize() will invoke
** sqlite3_os_init().  Similarly, ^sqlite3_shutdown()
** will invoke sqlite3_os_end().
**
** ^The sqlite3_initialize() routine returns [SQLITE_OK] on success.
** ^If for some reason, sqlite3_initialize() is unable to initialize
** the library (perhaps it is unable to allocate a needed resource such
** as a mutex) it returns an [error code] other than [SQLITE_OK].
**
** ^The sqlite3_initialize() routine is called internally by many other
** SQLite interfaces so that an application usually does not need to
** invoke sqlite3_initialize() directly.  For example, [sqlite3_open()]
** calls sqlite3_initialize() so the SQLite library will be automatically
** initialized when [sqlite3_open()] is called if it has not be initialized
** already.  ^However, if SQLite is compiled with the [SQLITE_OMIT_AUTOINIT]
** compile-time option, then the automatic calls to sqlite3_initialize()
** are omitted and the application must call sqlite3_initialize() directly
** prior to using any other SQLite interface.  For maximum portability,
** it is recommended that applications always invoke sqlite3_initialize()
** directly prior to using any other SQLite interface.  Future releases
** of SQLite may require this.  In other words, the behavior exhibited
** when SQLite is compiled with [SQLITE_OMIT_AUTOINIT] might become the
** default behavior in some future release of SQLite.
**
** The sqlite3_os_init() routine does operating-system specific
** initialization of the SQLite library.  The sqlite3_os_end()
** routine undoes the effect of sqlite3_os_init().  Typical tasks
** performed by these routines include allocation or deallocation
** of static resources, initialization of global variables,
** setting up a default [sqlite3_vfs] module, or setting up
** a default configuration using [sqlite3_config()].
**
** The application should never invoke either sqlite3_os_init()
** or sqlite3_os_end() directly.  The application should only invoke
** sqlite3_initialize() and sqlite3_shutdown().  The sqlite3_os_init()
** interface is called automatically by sqlite3_initialize() and
** sqlite3_os_end() is called by sqlite3_shutdown().  Appropriate
** implementations for sqlite3_os_init() and sqlite3_os_end()
** are built into SQLite when it is compiled for Unix, Windows, or OS/2.
** When [custom builds | built for other platforms]
** (using the [SQLITE_OS_OTHER=1] compile-time
** option) the application must supply a suitable implementation for
** sqlite3_os_init() and sqlite3_os_end().  An application-supplied
** implementation of sqlite3_os_init() or sqlite3_os_end()
** must return [SQLITE_OK] on success and some other [error code] upon
** failure.
*/
SQLITE_API int sqlite3_initialize(void);
SQLITE_API int sqlite3_shutdown(void);
SQLITE_API int sqlite3_os_init(void);
SQLITE_API int sqlite3_os_end(void);

/*
** CAPI3REF: Configuring The SQLite Library
**
** The sqlite3_config() interface is used to make global configuration
** changes to SQLite in order to tune SQLite to the specific needs of
** the application.  The default configuration is recommended for most
** applications and so this routine is usually not necessary.  It is
** provided to support rare applications with unusual needs.
**
** The sqlite3_config() interface is not threadsafe.  The application
** must insure that no other SQLite interfaces are invoked by other
** threads while sqlite3_config() is running.  Furthermore, sqlite3_config()
** may only be invoked prior to library initialization using
** [sqlite3_initialize()] or after shutdown by [sqlite3_shutdown()].
** ^If sqlite3_config() is called after [sqlite3_initialize()] and before
** [sqlite3_shutdown()] then it will return SQLITE_MISUSE.
** Note, however, that ^sqlite3_config() can be called as part of the
** implementation of an application-defined [sqlite3_os_init()].
**
** The first argument to sqlite3_config() is an integer
** [configuration option] that determines
** what property of SQLite is to be configured.  Subsequent arguments
** vary depending on the [configuration option]
** in the first argument.
**
** ^When a configuration option is set, sqlite3_config() returns [SQLITE_OK].
** ^If the option is unknown or SQLite is unable to set the option
** then this routine returns a non-zero [error code].
*/
SQLITE_API int sqlite3_config(int, ...);

/*
** CAPI3REF: Configure database connections
**
** The sqlite3_db_config() interface is used to make configuration
** changes to a [database connection].  The interface is similar to
** [sqlite3_config()] except that the changes apply to a single
** [database connection] (specified in the first argument).
**
** The second argument to sqlite3_db_config(D,V,...)  is the
** [SQLITE_DBCONFIG_LOOKASIDE | configuration verb] - an integer code 
** that indicates what aspect of the [database connection] is being configured.
** Subsequent arguments vary depending on the configuration verb.
**
** ^Calls to sqlite3_db_config() return SQLITE_OK if and only if
** the call is considered successful.
*/
SQLITE_API int sqlite3_db_config(sqlite3*, int op, ...);

/*
** CAPI3REF: Memory Allocation Routines
**
** An instance of this object defines the interface between SQLite
** and low-level memory allocation routines.
**
** This object is used in only one place in the SQLite interface.
** A pointer to an instance of this object is the argument to
** [sqlite3_config()] when the configuration option is
** [SQLITE_CONFIG_MALLOC] or [SQLITE_CONFIG_GETMALLOC].  
** By creating an instance of this object
** and passing it to [sqlite3_config]([SQLITE_CONFIG_MALLOC])
** during configuration, an application can specify an alternative
** memory allocation subsystem for SQLite to use for all of its
** dynamic memory needs.
**
** Note that SQLite comes with several [built-in memory allocators]
** that are perfectly adequate for the overwhelming majority of applications
** and that this object is only useful to a tiny minority of applications
** with specialized memory allocation requirements.  This object is
** also used during testing of SQLite in order to specify an alternative
** memory allocator that simulates memory out-of-memory conditions in
** order to verify that SQLite recovers gracefully from such
** conditions.
**
** The xMalloc and xFree methods must work like the
** malloc() and free() functions from the standard C library.
** The xRealloc method must work like realloc() from the standard C library
** with the exception that if the second argument to xRealloc is zero,
** xRealloc must be a no-op - it must not perform any allocation or
** deallocation.  ^SQLite guarantees that the second argument to
** xRealloc is always a value returned by a prior call to xRoundup.
** And so in cases where xRoundup always returns a positive number,
** xRealloc can perform exactly as the standard library realloc() and
** still be in compliance with this specification.
**
** xSize should return the allocated size of a memory allocation
** previously obtained from xMalloc or xRealloc.  The allocated size
** is always at least as big as the requested size but may be larger.
**
** The xRoundup method returns what would be the allocated size of
** a memory allocation given a particular requested size.  Most memory
** allocators round up memory allocations at least to the next multiple
** of 8.  Some allocators round up to a larger multiple or to a power of 2.
** Every memory allocation request coming in through [sqlite3_malloc()]
** or [sqlite3_realloc()] first calls xRoundup.  If xRoundup returns 0, 
** that causes the corresponding memory allocation to fail.
**
** The xInit method initializes the memory allocator.  (For example,
** it might allocate any require mutexes or initialize internal data
** structures.  The xShutdown method is invoked (indirectly) by
** [sqlite3_shutdown()] and should deallocate any resources acquired
** by xInit.  The pAppData pointer is used as the only parameter to
** xInit and xShutdown.
**
** SQLite holds the [SQLITE_MUTEX_STATIC_MASTER] mutex when it invokes
** the xInit method, so the xInit method need not be threadsafe.  The
** xShutdown method is only called from [sqlite3_shutdown()] so it does
** not need to be threadsafe either.  For all other methods, SQLite
** holds the [SQLITE_MUTEX_STATIC_MEM] mutex as long as the
** [SQLITE_CONFIG_MEMSTATUS] configuration option is turned on (which
** it is by default) and so the methods are automatically serialized.
** However, if [SQLITE_CONFIG_MEMSTATUS] is disabled, then the other
** methods must be threadsafe or else make their own arrangements for
** serialization.
**
** SQLite will never invoke xInit() more than once without an intervening
** call to xShutdown().
*/
typedef struct sqlite3_mem_methods sqlite3_mem_methods;
struct sqlite3_mem_methods {
  void *(*xMalloc)(int);         /* Memory allocation function */
  void (*xFree)(void*);          /* Free a prior allocation */
  void *(*xRealloc)(void*,int);  /* Resize an allocation */
  int (*xSize)(void*);           /* Return the size of an allocation */
  int (*xRoundup)(int);          /* Round up request size to allocation size */
  int (*xInit)(void*);           /* Initialize the memory allocator */
  void (*xShutdown)(void*);      /* Deinitialize the memory allocator */
  void *pAppData;                /* Argument to xInit() and xShutdown() */
};

/*
** CAPI3REF: Configuration Options
** KEYWORDS: {configuration option}
**
** These constants are the available integer configuration options that
** can be passed as the first argument to the [sqlite3_config()] interface.
**
** New configuration options may be added in future releases of SQLite.
** Existing configuration options might be discontinued.  Applications
** should check the return code from [sqlite3_config()] to make sure that
** the call worked.  The [sqlite3_config()] interface will return a
** non-zero [error code] if a discontinued or unsupported configuration option
** is invoked.
**
** <dl>
** [[SQLITE_CONFIG_SINGLETHREAD]] <dt>SQLITE_CONFIG_SINGLETHREAD</dt>
** <dd>There are no arguments to this option.  ^This option sets the
** [threading mode] to Single-thread.  In other words, it disables
** all mutexing and puts SQLite into a mode where it can only be used
** by a single thread.   ^If SQLite is compiled with
** the [SQLITE_THREADSAFE | SQLITE_THREADSAFE=0] compile-time option then
** it is not possible to change the [threading mode] from its default
** value of Single-thread and so [sqlite3_config()] will return 
** [SQLITE_ERROR] if called with the SQLITE_CONFIG_SINGLETHREAD
** configuration option.</dd>
**
** [[SQLITE_CONFIG_MULTITHREAD]] <dt>SQLITE_CONFIG_MULTITHREAD</dt>
** <dd>There are no arguments to this option.  ^This option sets the
** [threading mode] to Multi-thread.  In other words, it disables
** mutexing on [database connection] and [prepared statement] objects.
** The application is responsible for serializing access to
** [database connections] and [prepared statements].  But other mutexes
** are enabled so that SQLite will be safe to use in a multi-threaded
** environment as long as no two threads attempt to use the same
** [database connection] at the same time.  ^If SQLite is compiled with
** the [SQLITE_THREADSAFE | SQLITE_THREADSAFE=0] compile-time option then
** it is not possible to set the Multi-thread [threading mode] and
** [sqlite3_config()] will return [SQLITE_ERROR] if called with the
** SQLITE_CONFIG_MULTITHREAD configuration option.</dd>
**
** [[SQLITE_CONFIG_SERIALIZED]] <dt>SQLITE_CONFIG_SERIALIZED</dt>
** <dd>There are no arguments to this option.  ^This option sets the
** [threading mode] to Serialized. In other words, this option enables
** all mutexes including the recursive
** mutexes on [database connection] and [prepared statement] objects.
** In this mode (which is the default when SQLite is compiled with
** [SQLITE_THREADSAFE=1]) the SQLite library will itself serialize access
** to [database connections] and [prepared statements] so that the
** application is free to use the same [database connection] or the
** same [prepared statement] in different threads at the same time.
** ^If SQLite is compiled with
** the [SQLITE_THREADSAFE | SQLITE_THREADSAFE=0] compile-time option then
** it is not possible to set the Serialized [threading mode] and
** [sqlite3_config()] will return [SQLITE_ERROR] if called with the
** SQLITE_CONFIG_SERIALIZED configuration option.</dd>
**
** [[SQLITE_CONFIG_MALLOC]] <dt>SQLITE_CONFIG_MALLOC</dt>
** <dd> ^(This option takes a single argument which is a pointer to an
** instance of the [sqlite3_mem_methods] structure.  The argument specifies
** alternative low-level memory allocation routines to be used in place of
** the memory allocation routines built into SQLite.)^ ^SQLite makes
** its own private copy of the content of the [sqlite3_mem_methods] structure
** before the [sqlite3_config()] call returns.</dd>
**
** [[SQLITE_CONFIG_GETMALLOC]] <dt>SQLITE_CONFIG_GETMALLOC</dt>
** <dd> ^(This option takes a single argument which is a pointer to an
** instance of the [sqlite3_mem_methods] structure.  The [sqlite3_mem_methods]
** structure is filled with the currently defined memory allocation routines.)^
** This option can be used to overload the default memory allocation
** routines with a wrapper that simulations memory allocation failure or
** tracks memory usage, for example. </dd>
**
** [[SQLITE_CONFIG_MEMSTATUS]] <dt>SQLITE_CONFIG_MEMSTATUS</dt>
** <dd> ^This option takes single argument of type int, interpreted as a 
** boolean, which enables or disables the collection of memory allocation 
** statistics. ^(When memory allocation statistics are disabled, the 
** following SQLite interfaces become non-operational:
**   <ul>
**   <li> [sqlite3_memory_used()]
**   <li> [sqlite3_memory_highwater()]
**   <li> [sqlite3_soft_heap_limit64()]
**   <li> [sqlite3_status()]
**   </ul>)^
** ^Memory allocation statistics are enabled by default unless SQLite is
** compiled with [SQLITE_DEFAULT_MEMSTATUS]=0 in which case memory
** allocation statistics are disabled by default.
** </dd>
**
** [[SQLITE_CONFIG_SCRATCH]] <dt>SQLITE_CONFIG_SCRATCH</dt>
** <dd> ^This option specifies a static memory buffer that SQLite can use for
** scratch memory.  There are three arguments:  A pointer an 8-byte
** aligned memory buffer from which the scratch allocations will be
** drawn, the size of each scratch allocation (sz),
** and the maximum number of scratch allocations (N).  The sz
** argument must be a multiple of 16.
** The first argument must be a pointer to an 8-byte aligned buffer
** of at least sz*N bytes of memory.
** ^SQLite will use no more than two scratch buffers per thread.  So
** N should be set to twice the expected maximum number of threads.
** ^SQLite will never require a scratch buffer that is more than 6
** times the database page size. ^If SQLite needs needs additional
** scratch memory beyond what is provided by this configuration option, then 
** [sqlite3_malloc()] will be used to obtain the memory needed.</dd>
**
** [[SQLITE_CONFIG_PAGECACHE]] <dt>SQLITE_CONFIG_PAGECACHE</dt>
** <dd> ^This option specifies a static memory buffer that SQLite can use for
** the database page cache with the default page cache implementation.  
** This configuration should not be used if an application-define page
** cache implementation is loaded using the SQLITE_CONFIG_PCACHE option.
** There are three arguments to this option: A pointer to 8-byte aligned
** memory, the size of each page buffer (sz), and the number of pages (N).
** The sz argument should be the size of the largest database page
** (a power of two between 512 and 32768) plus a little extra for each
** page header.  ^The page header size is 20 to 40 bytes depending on
** the host architecture.  ^It is harmless, apart from the wasted memory,
** to make sz a little too large.  The first
** argument should point to an allocation of at least sz*N bytes of memory.
** ^SQLite will use the memory provided by the first argument to satisfy its
** memory needs for the first N pages that it adds to cache.  ^If additional
** page cache memory is needed beyond what is provided by this option, then
** SQLite goes to [sqlite3_malloc()] for the additional storage space.
** The pointer in the first argument must
** be aligned to an 8-byte boundary or subsequent behavior of SQLite
** will be undefined.</dd>
**
** [[SQLITE_CONFIG_HEAP]] <dt>SQLITE_CONFIG_HEAP</dt>
** <dd> ^This option specifies a static memory buffer that SQLite will use
** for all of its dynamic memory allocation needs beyond those provided
** for by [SQLITE_CONFIG_SCRATCH] and [SQLITE_CONFIG_PAGECACHE].
** There are three arguments: An 8-byte aligned pointer to the memory,
** the number of bytes in the memory buffer, and the minimum allocation size.
** ^If the first pointer (the memory pointer) is NULL, then SQLite reverts
** to using its default memory allocator (the system malloc() implementation),
** undoing any prior invocation of [SQLITE_CONFIG_MALLOC].  ^If the
** memory pointer is not NULL and either [SQLITE_ENABLE_MEMSYS3] or
** [SQLITE_ENABLE_MEMSYS5] are defined, then the alternative memory
** allocator is engaged to handle all of SQLites memory allocation needs.
** The first pointer (the memory pointer) must be aligned to an 8-byte
** boundary or subsequent behavior of SQLite will be undefined.
** The minimum allocation size is capped at 2^12. Reasonable values
** for the minimum allocation size are 2^5 through 2^8.</dd>
**
** [[SQLITE_CONFIG_MUTEX]] <dt>SQLITE_CONFIG_MUTEX</dt>
** <dd> ^(This option takes a single argument which is a pointer to an
** instance of the [sqlite3_mutex_methods] structure.  The argument specifies
** alternative low-level mutex routines to be used in place
** the mutex routines built into SQLite.)^  ^SQLite makes a copy of the
** content of the [sqlite3_mutex_methods] structure before the call to
** [sqlite3_config()] returns. ^If SQLite is compiled with
** the [SQLITE_THREADSAFE | SQLITE_THREADSAFE=0] compile-time option then
** the entire mutexing subsystem is omitted from the build and hence calls to
** [sqlite3_config()] with the SQLITE_CONFIG_MUTEX configuration option will
** return [SQLITE_ERROR].</dd>
**
** [[SQLITE_CONFIG_GETMUTEX]] <dt>SQLITE_CONFIG_GETMUTEX</dt>
** <dd> ^(This option takes a single argument which is a pointer to an
** instance of the [sqlite3_mutex_methods] structure.  The
** [sqlite3_mutex_methods]
** structure is filled with the currently defined mutex routines.)^
** This option can be used to overload the default mutex allocation
** routines with a wrapper used to track mutex usage for performance
** profiling or testing, for example.   ^If SQLite is compiled with
** the [SQLITE_THREADSAFE | SQLITE_THREADSAFE=0] compile-time option then
** the entire mutexing subsystem is omitted from the build and hence calls to
** [sqlite3_config()] with the SQLITE_CONFIG_GETMUTEX configuration option will
** return [SQLITE_ERROR].</dd>
**
** [[SQLITE_CONFIG_LOOKASIDE]] <dt>SQLITE_CONFIG_LOOKASIDE</dt>
** <dd> ^(This option takes two arguments that determine the default
** memory allocation for the lookaside memory allocator on each
** [database connection].  The first argument is the
** size of each lookaside buffer slot and the second is the number of
** slots allocated to each database connection.)^  ^(This option sets the
** <i>default</i> lookaside size. The [SQLITE_DBCONFIG_LOOKASIDE]
** verb to [sqlite3_db_config()] can be used to change the lookaside
** configuration on individual connections.)^ </dd>
**
** [[SQLITE_CONFIG_PCACHE]] <dt>SQLITE_CONFIG_PCACHE</dt>
** <dd> ^(This option takes a single argument which is a pointer to
** an [sqlite3_pcache_methods] object.  This object specifies the interface
** to a custom page cache implementation.)^  ^SQLite makes a copy of the
** object and uses it for page cache memory allocations.</dd>
**
** [[SQLITE_CONFIG_GETPCACHE]] <dt>SQLITE_CONFIG_GETPCACHE</dt>
** <dd> ^(This option takes a single argument which is a pointer to an
** [sqlite3_pcache_methods] object.  SQLite copies of the current
** page cache implementation into that object.)^ </dd>
**
** [[SQLITE_CONFIG_LOG]] <dt>SQLITE_CONFIG_LOG</dt>
** <dd> ^The SQLITE_CONFIG_LOG option takes two arguments: a pointer to a
** function with a call signature of void(*)(void*,int,const char*), 
** and a pointer to void. ^If the function pointer is not NULL, it is
** invoked by [sqlite3_log()] to process each logging event.  ^If the
** function pointer is NULL, the [sqlite3_log()] interface becomes a no-op.
** ^The void pointer that is the second argument to SQLITE_CONFIG_LOG is
** passed through as the first parameter to the application-defined logger
** function whenever that function is invoked.  ^The second parameter to
** the logger function is a copy of the first parameter to the corresponding
** [sqlite3_log()] call and is intended to be a [result code] or an
** [extended result code].  ^The third parameter passed to the logger is
** log message after formatting via [sqlite3_snprintf()].
** The SQLite logging interface is not reentrant; the logger function
** supplied by the application must not invoke any SQLite interface.
** In a multi-threaded application, the application-defined logger
** function must be threadsafe. </dd>
**
** [[SQLITE_CONFIG_URI]] <dt>SQLITE_CONFIG_URI
** <dd> This option takes a single argument of type int. If non-zero, then
** URI handling is globally enabled. If the parameter is zero, then URI handling
** is globally disabled. If URI handling is globally enabled, all filenames
** passed to [sqlite3_open()], [sqlite3_open_v2()], [sqlite3_open16()] or
** specified as part of [ATTACH] commands are interpreted as URIs, regardless
** of whether or not the [SQLITE_OPEN_URI] flag is set when the database
** connection is opened. If it is globally disabled, filenames are
** only interpreted as URIs if the SQLITE_OPEN_URI flag is set when the
** database connection is opened. By default, URI handling is globally
** disabled. The default value may be changed by compiling with the
** [SQLITE_USE_URI] symbol defined.
** </dl>
*/
#define SQLITE_CONFIG_SINGLETHREAD  1  /* nil */
#define SQLITE_CONFIG_MULTITHREAD   2  /* nil */
#define SQLITE_CONFIG_SERIALIZED    3  /* nil */
#define SQLITE_CONFIG_MALLOC        4  /* sqlite3_mem_methods* */
#define SQLITE_CONFIG_GETMALLOC     5  /* sqlite3_mem_methods* */
#define SQLITE_CONFIG_SCRATCH       6  /* void*, int sz, int N */
#define SQLITE_CONFIG_PAGECACHE     7  /* void*, int sz, int N */
#define SQLITE_CONFIG_HEAP          8  /* void*, int nByte, int min */
#define SQLITE_CONFIG_MEMSTATUS     9  /* boolean */
#define SQLITE_CONFIG_MUTEX        10  /* sqlite3_mutex_methods* */
#define SQLITE_CONFIG_GETMUTEX     11  /* sqlite3_mutex_methods* */
/* previously SQLITE_CONFIG_CHUNKALLOC 12 which is now unused. */ 
#define SQLITE_CONFIG_LOOKASIDE    13  /* int int */
#define SQLITE_CONFIG_PCACHE       14  /* sqlite3_pcache_methods* */
#define SQLITE_CONFIG_GETPCACHE    15  /* sqlite3_pcache_methods* */
#define SQLITE_CONFIG_LOG          16  /* xFunc, void* */
#define SQLITE_CONFIG_URI          17  /* int */

/*
** CAPI3REF: Database Connection Configuration Options
**
** These constants are the available integer configuration options that
** can be passed as the second argument to the [sqlite3_db_config()] interface.
**
** New configuration options may be added in future releases of SQLite.
** Existing configuration options might be discontinued.  Applications
** should check the return code from [sqlite3_db_config()] to make sure that
** the call worked.  ^The [sqlite3_db_config()] interface will return a
** non-zero [error code] if a discontinued or unsupported configuration option
** is invoked.
**
** <dl>
** <dt>SQLITE_DBCONFIG_LOOKASIDE</dt>
** <dd> ^This option takes three additional arguments that determine the 
** [lookaside memory allocator] configuration for the [database connection].
** ^The first argument (the third parameter to [sqlite3_db_config()] is a
** pointer to a memory buffer to use for lookaside memory.
** ^The first argument after the SQLITE_DBCONFIG_LOOKASIDE verb
** may be NULL in which case SQLite will allocate the
** lookaside buffer itself using [sqlite3_malloc()]. ^The second argument is the
** size of each lookaside buffer slot.  ^The third argument is the number of
** slots.  The size of the buffer in the first argument must be greater than
** or equal to the product of the second and third arguments.  The buffer
** must be aligned to an 8-byte boundary.  ^If the second argument to
** SQLITE_DBCONFIG_LOOKASIDE is not a multiple of 8, it is internally
** rounded down to the next smaller multiple of 8.  ^(The lookaside memory
** configuration for a database connection can only be changed when that
** connection is not currently using lookaside memory, or in other words
** when the "current value" returned by
** [sqlite3_db_status](D,[SQLITE_CONFIG_LOOKASIDE],...) is zero.
** Any attempt to change the lookaside memory configuration when lookaside
** memory is in use leaves the configuration unchanged and returns 
** [SQLITE_BUSY].)^</dd>
**
** <dt>SQLITE_DBCONFIG_ENABLE_FKEY</dt>
** <dd> ^This option is used to enable or disable the enforcement of
** [foreign key constraints].  There should be two additional arguments.
** The first argument is an integer which is 0 to disable FK enforcement,
** positive to enable FK enforcement or negative to leave FK enforcement
** unchanged.  The second parameter is a pointer to an integer into which
** is written 0 or 1 to indicate whether FK enforcement is off or on
** following this call.  The second parameter may be a NULL pointer, in
** which case the FK enforcement setting is not reported back. </dd>
**
** <dt>SQLITE_DBCONFIG_ENABLE_TRIGGER</dt>
** <dd> ^This option is used to enable or disable [CREATE TRIGGER | triggers].
** There should be two additional arguments.
** The first argument is an integer which is 0 to disable triggers,
** positive to enable triggers or negative to leave the setting unchanged.
** The second parameter is a pointer to an integer into which
** is written 0 or 1 to indicate whether triggers are disabled or enabled
** following this call.  The second parameter may be a NULL pointer, in
** which case the trigger setting is not reported back. </dd>
**
** </dl>
*/
#define SQLITE_DBCONFIG_LOOKASIDE       1001  /* void* int int */
#define SQLITE_DBCONFIG_ENABLE_FKEY     1002  /* int int* */
#define SQLITE_DBCONFIG_ENABLE_TRIGGER  1003  /* int int* */


/*
** CAPI3REF: Enable Or Disable Extended Result Codes
**
** ^The sqlite3_extended_result_codes() routine enables or disables the
** [extended result codes] feature of SQLite. ^The extended result
** codes are disabled by default for historical compatibility.
*/
SQLITE_API int sqlite3_extended_result_codes(sqlite3*, int onoff);

/*
** CAPI3REF: Last Insert Rowid
**
** ^Each entry in an SQLite table has a unique 64-bit signed
** integer key called the [ROWID | "rowid"]. ^The rowid is always available
** as an undeclared column named ROWID, OID, or _ROWID_ as long as those
** names are not also used by explicitly declared columns. ^If
** the table has a column of type [INTEGER PRIMARY KEY] then that column
** is another alias for the rowid.
**
** ^This routine returns the [rowid] of the most recent
** successful [INSERT] into the database from the [database connection]
** in the first argument.  ^As of SQLite version 3.7.7, this routines
** records the last insert rowid of both ordinary tables and [virtual tables].
** ^If no successful [INSERT]s
** have ever occurred on that database connection, zero is returned.
**
** ^(If an [INSERT] occurs within a trigger or within a [virtual table]
** method, then this routine will return the [rowid] of the inserted
** row as long as the trigger or virtual table method is running.
** But once the trigger or virtual table method ends, the value returned 
** by this routine reverts to what it was before the trigger or virtual
** table method began.)^
**
** ^An [INSERT] that fails due to a constraint violation is not a
** successful [INSERT] and does not change the value returned by this
** routine.  ^Thus INSERT OR FAIL, INSERT OR IGNORE, INSERT OR ROLLBACK,
** and INSERT OR ABORT make no changes to the return value of this
** routine when their insertion fails.  ^(When INSERT OR REPLACE
** encounters a constraint violation, it does not fail.  The
** INSERT continues to completion after deleting rows that caused
** the constraint problem so INSERT OR REPLACE will always change
** the return value of this interface.)^
**
** ^For the purposes of this routine, an [INSERT] is considered to
** be successful even if it is subsequently rolled back.
**
** This function is accessible to SQL statements via the
** [last_insert_rowid() SQL function].
**
** If a separate thread performs a new [INSERT] on the same
** database connection while the [sqlite3_last_insert_rowid()]
** function is running and thus changes the last insert [rowid],
** then the value returned by [sqlite3_last_insert_rowid()] is
** unpredictable and might not equal either the old or the new
** last insert [rowid].
*/
SQLITE_API sqlite3_int64 sqlite3_last_insert_rowid(sqlite3*);

/*
** CAPI3REF: Count The Number Of Rows Modified
**
** ^This function returns the number of database rows that were changed
** or inserted or deleted by the most recently completed SQL statement
** on the [database connection] specified by the first parameter.
** ^(Only changes that are directly specified by the [INSERT], [UPDATE],
** or [DELETE] statement are counted.  Auxiliary changes caused by
** triggers or [foreign key actions] are not counted.)^ Use the
** [sqlite3_total_changes()] function to find the total number of changes
** including changes caused by triggers and foreign key actions.
**
** ^Changes to a view that are simulated by an [INSTEAD OF trigger]
** are not counted.  Only real table changes are counted.
**
** ^(A "row change" is a change to a single row of a single table
** caused by an INSERT, DELETE, or UPDATE statement.  Rows that
** are changed as side effects of [REPLACE] constraint resolution,
** rollback, ABORT processing, [DROP TABLE], or by any other
** mechanisms do not count as direct row changes.)^
**
** A "trigger context" is a scope of execution that begins and
** ends with the script of a [CREATE TRIGGER | trigger]. 
** Most SQL statements are
** evaluated outside of any trigger.  This is the "top level"
** trigger context.  If a trigger fires from the top level, a
** new trigger context is entered for the duration of that one
** trigger.  Subtriggers create subcontexts for their duration.
**
** ^Calling [sqlite3_exec()] or [sqlite3_step()] recursively does
** not create a new trigger context.
**
** ^This function returns the number of direct row changes in the
** most recent INSERT, UPDATE, or DELETE statement within the same
** trigger context.
**
** ^Thus, when called from the top level, this function returns the
** number of changes in the most recent INSERT, UPDATE, or DELETE
** that also occurred at the top level.  ^(Within the body of a trigger,
** the sqlite3_changes() interface can be called to find the number of
** changes in the most recently completed INSERT, UPDATE, or DELETE
** statement within the body of the same trigger.
** However, the number returned does not include changes
** caused by subtriggers since those have their own context.)^
**
** See also the [sqlite3_total_changes()] interface, the
** [count_changes pragma], and the [changes() SQL function].
**
** If a separate thread makes changes on the same database connection
** while [sqlite3_changes()] is running then the value returned
** is unpredictable and not meaningful.
*/
SQLITE_API int sqlite3_changes(sqlite3*);

/*
** CAPI3REF: Total Number Of Rows Modified
**
** ^This function returns the number of row changes caused by [INSERT],
** [UPDATE] or [DELETE] statements since the [database connection] was opened.
** ^(The count returned by sqlite3_total_changes() includes all changes
** from all [CREATE TRIGGER | trigger] contexts and changes made by
** [foreign key actions]. However,
** the count does not include changes used to implement [REPLACE] constraints,
** do rollbacks or ABORT processing, or [DROP TABLE] processing.  The
** count does not include rows of views that fire an [INSTEAD OF trigger],
** though if the INSTEAD OF trigger makes changes of its own, those changes 
** are counted.)^
** ^The sqlite3_total_changes() function counts the changes as soon as
** the statement that makes them is completed (when the statement handle
** is passed to [sqlite3_reset()] or [sqlite3_finalize()]).
**
** See also the [sqlite3_changes()] interface, the
** [count_changes pragma], and the [total_changes() SQL function].
**
** If a separate thread makes changes on the same database connection
** while [sqlite3_total_changes()] is running then the value
** returned is unpredictable and not meaningful.
*/
SQLITE_API int sqlite3_total_changes(sqlite3*);

/*
** CAPI3REF: Interrupt A Long-Running Query
**
** ^This function causes any pending database operation to abort and
** return at its earliest opportunity. This routine is typically
** called in response to a user action such as pressing "Cancel"
** or Ctrl-C where the user wants a long query operation to halt
** immediately.
**
** ^It is safe to call this routine from a thread different from the
** thread that is currently running the database operation.  But it
** is not safe to call this routine with a [database connection] that
** is closed or might close before sqlite3_interrupt() returns.
**
** ^If an SQL operation is very nearly finished at the time when
** sqlite3_interrupt() is called, then it might not have an opportunity
** to be interrupted and might continue to completion.
**
** ^An SQL operation that is interrupted will return [SQLITE_INTERRUPT].
** ^If the interrupted SQL operation is an INSERT, UPDATE, or DELETE
** that is inside an explicit transaction, then the entire transaction
** will be rolled back automatically.
**
** ^The sqlite3_interrupt(D) call is in effect until all currently running
** SQL statements on [database connection] D complete.  ^Any new SQL statements
** that are started after the sqlite3_interrupt() call and before the 
** running statements reaches zero are interrupted as if they had been
** running prior to the sqlite3_interrupt() call.  ^New SQL statements
** that are started after the running statement count reaches zero are
** not effected by the sqlite3_interrupt().
** ^A call to sqlite3_interrupt(D) that occurs when there are no running
** SQL statements is a no-op and has no effect on SQL statements
** that are started after the sqlite3_interrupt() call returns.
**
** If the database connection closes while [sqlite3_interrupt()]
** is running then bad things will likely happen.
*/
SQLITE_API void sqlite3_interrupt(sqlite3*);

/*
** CAPI3REF: Determine If An SQL Statement Is Complete
**
** These routines are useful during command-line input to determine if the
** currently entered text seems to form a complete SQL statement or
** if additional input is needed before sending the text into
** SQLite for parsing.  ^These routines return 1 if the input string
** appears to be a complete SQL statement.  ^A statement is judged to be
** complete if it ends with a semicolon token and is not a prefix of a
** well-formed CREATE TRIGGER statement.  ^Semicolons that are embedded within
** string literals or quoted identifier names or comments are not
** independent tokens (they are part of the token in which they are
** embedded) and thus do not count as a statement terminator.  ^Whitespace
** and comments that follow the final semicolon are ignored.
**
** ^These routines return 0 if the statement is incomplete.  ^If a
** memory allocation fails, then SQLITE_NOMEM is returned.
**
** ^These routines do not parse the SQL statements thus
** will not detect syntactically incorrect SQL.
**
** ^(If SQLite has not been initialized using [sqlite3_initialize()] prior 
** to invoking sqlite3_complete16() then sqlite3_initialize() is invoked
** automatically by sqlite3_complete16().  If that initialization fails,
** then the return value from sqlite3_complete16() will be non-zero
** regardless of whether or not the input SQL is complete.)^
**
** The input to [sqlite3_complete()] must be a zero-terminated
** UTF-8 string.
**
** The input to [sqlite3_complete16()] must be a zero-terminated
** UTF-16 string in native byte order.
*/
SQLITE_API int sqlite3_complete(const char *sql);
SQLITE_API int sqlite3_complete16(const void *sql);

/*
** CAPI3REF: Register A Callback To Handle SQLITE_BUSY Errors
**
** ^This routine sets a callback function that might be invoked whenever
** an attempt is made to open a database table that another thread
** or process has locked.
**
** ^If the busy callback is NULL, then [SQLITE_BUSY] or [SQLITE_IOERR_BLOCKED]
** is returned immediately upon encountering the lock.  ^If the busy callback
** is not NULL, then the callback might be invoked with two arguments.
**
** ^The first argument to the busy handler is a copy of the void* pointer which
** is the third argument to sqlite3_busy_handler().  ^The second argument to
** the busy handler callback is the number of times that the busy handler has
** been invoked for this locking event.  ^If the
** busy callback returns 0, then no additional attempts are made to
** access the database and [SQLITE_BUSY] or [SQLITE_IOERR_BLOCKED] is returned.
** ^If the callback returns non-zero, then another attempt
** is made to open the database for reading and the cycle repeats.
**
** The presence of a busy handler does not guarantee that it will be invoked
** when there is lock contention. ^If SQLite determines that invoking the busy
** handler could result in a deadlock, it will go ahead and return [SQLITE_BUSY]
** or [SQLITE_IOERR_BLOCKED] instead of invoking the busy handler.
** Consider a scenario where one process is holding a read lock that
** it is trying to promote to a reserved lock and
** a second process is holding a reserved lock that it is trying
** to promote to an exclusive lock.  The first process cannot proceed
** because it is blocked by the second and the second process cannot
** proceed because it is blocked by the first.  If both processes
** invoke the busy handlers, neither will make any progress.  Therefore,
** SQLite returns [SQLITE_BUSY] for the first process, hoping that this
** will induce the first process to release its read lock and allow
** the second process to proceed.
**
** ^The default busy callback is NULL.
**
** ^The [SQLITE_BUSY] error is converted to [SQLITE_IOERR_BLOCKED]
** when SQLite is in the middle of a large transaction where all the
** changes will not fit into the in-memory cache.  SQLite will
** already hold a RESERVED lock on the database file, but it needs
** to promote this lock to EXCLUSIVE so that it can spill cache
** pages into the database file without harm to concurrent
** readers.  ^If it is unable to promote the lock, then the in-memory
** cache will be left in an inconsistent state and so the error
** code is promoted from the relatively benign [SQLITE_BUSY] to
** the more severe [SQLITE_IOERR_BLOCKED].  ^This error code promotion
** forces an automatic rollback of the changes.  See the
** <a href="/cvstrac/wiki?p=CorruptionFollowingBusyError">
** CorruptionFollowingBusyError</a> wiki page for a discussion of why
** this is important.
**
** ^(There can only be a single busy handler defined for each
** [database connection].  Setting a new busy handler clears any
** previously set handler.)^  ^Note that calling [sqlite3_busy_timeout()]
** will also set or clear the busy handler.
**
** The busy callback should not take any actions which modify the
** database connection that invoked the busy handler.  Any such actions
** result in undefined behavior.
** 
** A busy handler must not close the database connection
** or [prepared statement] that invoked the busy handler.
*/
SQLITE_API int sqlite3_busy_handler(sqlite3*, int(*)(void*,int), void*);

/*
** CAPI3REF: Set A Busy Timeout
**
** ^This routine sets a [sqlite3_busy_handler | busy handler] that sleeps
** for a specified amount of time when a table is locked.  ^The handler
** will sleep multiple times until at least "ms" milliseconds of sleeping
** have accumulated.  ^After at least "ms" milliseconds of sleeping,
** the handler returns 0 which causes [sqlite3_step()] to return
** [SQLITE_BUSY] or [SQLITE_IOERR_BLOCKED].
**
** ^Calling this routine with an argument less than or equal to zero
** turns off all busy handlers.
**
** ^(There can only be a single busy handler for a particular
** [database connection] any any given moment.  If another busy handler
** was defined  (using [sqlite3_busy_handler()]) prior to calling
** this routine, that other busy handler is cleared.)^
*/
SQLITE_API int sqlite3_busy_timeout(sqlite3*, int ms);

/*
** CAPI3REF: Convenience Routines For Running Queries
**
** This is a legacy interface that is preserved for backwards compatibility.
** Use of this interface is not recommended.
**
** Definition: A <b>result table</b> is memory data structure created by the
** [sqlite3_get_table()] interface.  A result table records the
** complete query results from one or more queries.
**
** The table conceptually has a number of rows and columns.  But
** these numbers are not part of the result table itself.  These
** numbers are obtained separately.  Let N be the number of rows
** and M be the number of columns.
**
** A result table is an array of pointers to zero-terminated UTF-8 strings.
** There are (N+1)*M elements in the array.  The first M pointers point
** to zero-terminated strings that  contain the names of the columns.
** The remaining entries all point to query results.  NULL values result
** in NULL pointers.  All other values are in their UTF-8 zero-terminated
** string representation as returned by [sqlite3_column_text()].
**
** A result table might consist of one or more memory allocations.
** It is not safe to pass a result table directly to [sqlite3_free()].
** A result table should be deallocated using [sqlite3_free_table()].
**
** ^(As an example of the result table format, suppose a query result
** is as follows:
**
** <blockquote><pre>
**        Name        | Age
**        -----------------------
**        Alice       | 43
**        Bob         | 28
**        Cindy       | 21
** </pre></blockquote>
**
** There are two column (M==2) and three rows (N==3).  Thus the
** result table has 8 entries.  Suppose the result table is stored
** in an array names azResult.  Then azResult holds this content:
**
** <blockquote><pre>
**        azResult&#91;0] = "Name";
**        azResult&#91;1] = "Age";
**        azResult&#91;2] = "Alice";
**        azResult&#91;3] = "43";
**        azResult&#91;4] = "Bob";
**        azResult&#91;5] = "28";
**        azResult&#91;6] = "Cindy";
**        azResult&#91;7] = "21";
** </pre></blockquote>)^
**
** ^The sqlite3_get_table() function evaluates one or more
** semicolon-separated SQL statements in the zero-terminated UTF-8
** string of its 2nd parameter and returns a result table to the
** pointer given in its 3rd parameter.
**
** After the application has finished with the result from sqlite3_get_table(),
** it must pass the result table pointer to sqlite3_free_table() in order to
** release the memory that was malloced.  Because of the way the
** [sqlite3_malloc()] happens within sqlite3_get_table(), the calling
** function must not try to call [sqlite3_free()] directly.  Only
** [sqlite3_free_table()] is able to release the memory properly and safely.
**
** The sqlite3_get_table() interface is implemented as a wrapper around
** [sqlite3_exec()].  The sqlite3_get_table() routine does not have access
** to any internal data structures of SQLite.  It uses only the public
** interface defined here.  As a consequence, errors that occur in the
** wrapper layer outside of the internal [sqlite3_exec()] call are not
** reflected in subsequent calls to [sqlite3_errcode()] or
** [sqlite3_errmsg()].
*/
SQLITE_API int sqlite3_get_table(
  sqlite3 *db,          /* An open database */
  const char *zSql,     /* SQL to be evaluated */
  char ***pazResult,    /* Results of the query */
  int *pnRow,           /* Number of result rows written here */
  int *pnColumn,        /* Number of result columns written here */
  char **pzErrmsg       /* Error msg written here */
);
SQLITE_API void sqlite3_free_table(char **result);

/*
** CAPI3REF: Formatted String Printing Functions
**
** These routines are work-alikes of the "printf()" family of functions
** from the standard C library.
**
** ^The sqlite3_mprintf() and sqlite3_vmprintf() routines write their
** results into memory obtained from [sqlite3_malloc()].
** The strings returned by these two routines should be
** released by [sqlite3_free()].  ^Both routines return a
** NULL pointer if [sqlite3_malloc()] is unable to allocate enough
** memory to hold the resulting string.
**
** ^(The sqlite3_snprintf() routine is similar to "snprintf()" from
** the standard C library.  The result is written into the
** buffer supplied as the second parameter whose size is given by
** the first parameter. Note that the order of the
** first two parameters is reversed from snprintf().)^  This is an
** historical accident that cannot be fixed without breaking
** backwards compatibility.  ^(Note also that sqlite3_snprintf()
** returns a pointer to its buffer instead of the number of
** characters actually written into the buffer.)^  We admit that
** the number of characters written would be a more useful return
** value but we cannot change the implementation of sqlite3_snprintf()
** now without breaking compatibility.
**
** ^As long as the buffer size is greater than zero, sqlite3_snprintf()
** guarantees that the buffer is always zero-terminated.  ^The first
** parameter "n" is the total size of the buffer, including space for
** the zero terminator.  So the longest string that can be completely
** written will be n-1 characters.
**
** ^The sqlite3_vsnprintf() routine is a varargs version of sqlite3_snprintf().
**
** These routines all implement some additional formatting
** options that are useful for constructing SQL statements.
** All of the usual printf() formatting options apply.  In addition, there
** is are "%q", "%Q", and "%z" options.
**
** ^(The %q option works like %s in that it substitutes a null-terminated
** string from the argument list.  But %q also doubles every '\'' character.
** %q is designed for use inside a string literal.)^  By doubling each '\''
** character it escapes that character and allows it to be inserted into
** the string.
**
** For example, assume the string variable zText contains text as follows:
**
** <blockquote><pre>
**  char *zText = "It's a happy day!";
** </pre></blockquote>
**
** One can use this text in an SQL statement as follows:
**
** <blockquote><pre>
**  char *zSQL = sqlite3_mprintf("INSERT INTO table VALUES('%q')", zText);
**  sqlite3_exec(db, zSQL, 0, 0, 0);
**  sqlite3_free(zSQL);
** </pre></blockquote>
**
** Because the %q format string is used, the '\'' character in zText
** is escaped and the SQL generated is as follows:
**
** <blockquote><pre>
**  INSERT INTO table1 VALUES('It''s a happy day!')
** </pre></blockquote>
**
** This is correct.  Had we used %s instead of %q, the generated SQL
** would have looked like this:
**
** <blockquote><pre>
**  INSERT INTO table1 VALUES('It's a happy day!');
** </pre></blockquote>
**
** This second example is an SQL syntax error.  As a general rule you should
** always use %q instead of %s when inserting text into a string literal.
**
** ^(The %Q option works like %q except it also adds single quotes around
** the outside of the total string.  Additionally, if the parameter in the
** argument list is a NULL pointer, %Q substitutes the text "NULL" (without
** single quotes).)^  So, for example, one could say:
**
** <blockquote><pre>
**  char *zSQL = sqlite3_mprintf("INSERT INTO table VALUES(%Q)", zText);
**  sqlite3_exec(db, zSQL, 0, 0, 0);
**  sqlite3_free(zSQL);
** </pre></blockquote>
**
** The code above will render a correct SQL statement in the zSQL
** variable even if the zText variable is a NULL pointer.
**
** ^(The "%z" formatting option works like "%s" but with the
** addition that after the string has been read and copied into
** the result, [sqlite3_free()] is called on the input string.)^
*/
SQLITE_API char *sqlite3_mprintf(const char*,...);
SQLITE_API char *sqlite3_vmprintf(const char*, va_list);
SQLITE_API char *sqlite3_snprintf(int,char*,const char*, ...);
SQLITE_API char *sqlite3_vsnprintf(int,char*,const char*, va_list);

/*
** CAPI3REF: Memory Allocation Subsystem
**
** The SQLite core uses these three routines for all of its own
** internal memory allocation needs. "Core" in the previous sentence
** does not include operating-system specific VFS implementation.  The
** Windows VFS uses native malloc() and free() for some operations.
**
** ^The sqlite3_malloc() routine returns a pointer to a block
** of memory at least N bytes in length, where N is the parameter.
** ^If sqlite3_malloc() is unable to obtain sufficient free
** memory, it returns a NULL pointer.  ^If the parameter N to
** sqlite3_malloc() is zero or negative then sqlite3_malloc() returns
** a NULL pointer.
**
** ^Calling sqlite3_free() with a pointer previously returned
** by sqlite3_malloc() or sqlite3_realloc() releases that memory so
** that it might be reused.  ^The sqlite3_free() routine is
** a no-op if is called with a NULL pointer.  Passing a NULL pointer
** to sqlite3_free() is harmless.  After being freed, memory
** should neither be read nor written.  Even reading previously freed
** memory might result in a segmentation fault or other severe error.
** Memory corruption, a segmentation fault, or other severe error
** might result if sqlite3_free() is called with a non-NULL pointer that
** was not obtained from sqlite3_malloc() or sqlite3_realloc().
**
** ^(The sqlite3_realloc() interface attempts to resize a
** prior memory allocation to be at least N bytes, where N is the
** second parameter.  The memory allocation to be resized is the first
** parameter.)^ ^ If the first parameter to sqlite3_realloc()
** is a NULL pointer then its behavior is identical to calling
** sqlite3_malloc(N) where N is the second parameter to sqlite3_realloc().
** ^If the second parameter to sqlite3_realloc() is zero or
** negative then the behavior is exactly the same as calling
** sqlite3_free(P) where P is the first parameter to sqlite3_realloc().
** ^sqlite3_realloc() returns a pointer to a memory allocation
** of at least N bytes in size or NULL if sufficient memory is unavailable.
** ^If M is the size of the prior allocation, then min(N,M) bytes
** of the prior allocation are copied into the beginning of buffer returned
** by sqlite3_realloc() and the prior allocation is freed.
** ^If sqlite3_realloc() returns NULL, then the prior allocation
** is not freed.
**
** ^The memory returned by sqlite3_malloc() and sqlite3_realloc()
** is always aligned to at least an 8 byte boundary, or to a
** 4 byte boundary if the [SQLITE_4_BYTE_ALIGNED_MALLOC] compile-time
** option is used.
**
** In SQLite version 3.5.0 and 3.5.1, it was possible to define
** the SQLITE_OMIT_MEMORY_ALLOCATION which would cause the built-in
** implementation of these routines to be omitted.  That capability
** is no longer provided.  Only built-in memory allocators can be used.
**
** The Windows OS interface layer calls
** the system malloc() and free() directly when converting
** filenames between the UTF-8 encoding used by SQLite
** and whatever filename encoding is used by the particular Windows
** installation.  Memory allocation errors are detected, but
** they are reported back as [SQLITE_CANTOPEN] or
** [SQLITE_IOERR] rather than [SQLITE_NOMEM].
**
** The pointer arguments to [sqlite3_free()] and [sqlite3_realloc()]
** must be either NULL or else pointers obtained from a prior
** invocation of [sqlite3_malloc()] or [sqlite3_realloc()] that have
** not yet been released.
**
** The application must not read or write any part of
** a block of memory after it has been released using
** [sqlite3_free()] or [sqlite3_realloc()].
*/
SQLITE_API void *sqlite3_malloc(int);
SQLITE_API void *sqlite3_realloc(void*, int);
SQLITE_API void sqlite3_free(void*);

/*
** CAPI3REF: Memory Allocator Statistics
**
** SQLite provides these two interfaces for reporting on the status
** of the [sqlite3_malloc()], [sqlite3_free()], and [sqlite3_realloc()]
** routines, which form the built-in memory allocation subsystem.
**
** ^The [sqlite3_memory_used()] routine returns the number of bytes
** of memory currently outstanding (malloced but not freed).
** ^The [sqlite3_memory_highwater()] routine returns the maximum
** value of [sqlite3_memory_used()] since the high-water mark
** was last reset.  ^The values returned by [sqlite3_memory_used()] and
** [sqlite3_memory_highwater()] include any overhead
** added by SQLite in its implementation of [sqlite3_malloc()],
** but not overhead added by the any underlying system library
** routines that [sqlite3_malloc()] may call.
**
** ^The memory high-water mark is reset to the current value of
** [sqlite3_memory_used()] if and only if the parameter to
** [sqlite3_memory_highwater()] is true.  ^The value returned
** by [sqlite3_memory_highwater(1)] is the high-water mark
** prior to the reset.
*/
SQLITE_API sqlite3_int64 sqlite3_memory_used(void);
SQLITE_API sqlite3_int64 sqlite3_memory_highwater(int resetFlag);

/*
** CAPI3REF: Pseudo-Random Number Generator
**
** SQLite contains a high-quality pseudo-random number generator (PRNG) used to
** select random [ROWID | ROWIDs] when inserting new records into a table that
** already uses the largest possible [ROWID].  The PRNG is also used for
** the build-in random() and randomblob() SQL functions.  This interface allows
** applications to access the same PRNG for other purposes.
**
** ^A call to this routine stores N bytes of randomness into buffer P.
**
** ^The first time this routine is invoked (either internally or by
** the application) the PRNG is seeded using randomness obtained
** from the xRandomness method of the default [sqlite3_vfs] object.
** ^On all subsequent invocations, the pseudo-randomness is generated
** internally and without recourse to the [sqlite3_vfs] xRandomness
** method.
*/
SQLITE_API void sqlite3_randomness(int N, void *P);

/*
** CAPI3REF: Compile-Time Authorization Callbacks
**
** ^This routine registers an authorizer callback with a particular
** [database connection], supplied in the first argument.
** ^The authorizer callback is invoked as SQL statements are being compiled
** by [sqlite3_prepare()] or its variants [sqlite3_prepare_v2()],
** [sqlite3_prepare16()] and [sqlite3_prepare16_v2()].  ^At various
** points during the compilation process, as logic is being created
** to perform various actions, the authorizer callback is invoked to
** see if those actions are allowed.  ^The authorizer callback should
** return [SQLITE_OK] to allow the action, [SQLITE_IGNORE] to disallow the
** specific action but allow the SQL statement to continue to be
** compiled, or [SQLITE_DENY] to cause the entire SQL statement to be
** rejected with an error.  ^If the authorizer callback returns
** any value other than [SQLITE_IGNORE], [SQLITE_OK], or [SQLITE_DENY]
** then the [sqlite3_prepare_v2()] or equivalent call that triggered
** the authorizer will fail with an error message.
**
** When the callback returns [SQLITE_OK], that means the operation
** requested is ok.  ^When the callback returns [SQLITE_DENY], the
** [sqlite3_prepare_v2()] or equivalent call that triggered the
** authorizer will fail with an error message explaining that
** access is denied. 
**
** ^The first parameter to the authorizer callback is a copy of the third
** parameter to the sqlite3_set_authorizer() interface. ^The second parameter
** to the callback is an integer [SQLITE_COPY | action code] that specifies
** the particular action to be authorized. ^The third through sixth parameters
** to the callback are zero-terminated strings that contain additional
** details about the action to be authorized.
**
** ^If the action code is [SQLITE_READ]
** and the callback returns [SQLITE_IGNORE] then the
** [prepared statement] statement is constructed to substitute
** a NULL value in place of the table column that would have
** been read if [SQLITE_OK] had been returned.  The [SQLITE_IGNORE]
** return can be used to deny an untrusted user access to individual
** columns of a table.
** ^If the action code is [SQLITE_DELETE] and the callback returns
** [SQLITE_IGNORE] then the [DELETE] operation proceeds but the
** [truncate optimization] is disabled and all rows are deleted individually.
**
** An authorizer is used when [sqlite3_prepare | preparing]
** SQL statements from an untrusted source, to ensure that the SQL statements
** do not try to access data they are not allowed to see, or that they do not
** try to execute malicious statements that damage the database.  For
** example, an application may allow a user to enter arbitrary
** SQL queries for evaluation by a database.  But the application does
** not want the user to be able to make arbitrary changes to the
** database.  An authorizer could then be put in place while the
** user-entered SQL is being [sqlite3_prepare | prepared] that
** disallows everything except [SELECT] statements.
**
** Applications that need to process SQL from untrusted sources
** might also consider lowering resource limits using [sqlite3_limit()]
** and limiting database size using the [max_page_count] [PRAGMA]
** in addition to using an authorizer.
**
** ^(Only a single authorizer can be in place on a database connection
** at a time.  Each call to sqlite3_set_authorizer overrides the
** previous call.)^  ^Disable the authorizer by installing a NULL callback.
** The authorizer is disabled by default.
**
** The authorizer callback must not do anything that will modify
** the database connection that invoked the authorizer callback.
** Note that [sqlite3_prepare_v2()] and [sqlite3_step()] both modify their
** database connections for the meaning of "modify" in this paragraph.
**
** ^When [sqlite3_prepare_v2()] is used to prepare a statement, the
** statement might be re-prepared during [sqlite3_step()] due to a 
** schema change.  Hence, the application should ensure that the
** correct authorizer callback remains in place during the [sqlite3_step()].
**
** ^Note that the authorizer callback is invoked only during
** [sqlite3_prepare()] or its variants.  Authorization is not
** performed during statement evaluation in [sqlite3_step()], unless
** as stated in the previous paragraph, sqlite3_step() invokes
** sqlite3_prepare_v2() to reprepare a statement after a schema change.
*/
SQLITE_API int sqlite3_set_authorizer(
  sqlite3*,
  int (*xAuth)(void*,int,const char*,const char*,const char*,const char*),
  void *pUserData
);

/*
** CAPI3REF: Authorizer Return Codes
**
** The [sqlite3_set_authorizer | authorizer callback function] must
** return either [SQLITE_OK] or one of these two constants in order
** to signal SQLite whether or not the action is permitted.  See the
** [sqlite3_set_authorizer | authorizer documentation] for additional
** information.
**
** Note that SQLITE_IGNORE is also used as a [SQLITE_ROLLBACK | return code]
** from the [sqlite3_vtab_on_conflict()] interface.
*/
#define SQLITE_DENY   1   /* Abort the SQL statement with an error */
#define SQLITE_IGNORE 2   /* Don't allow access, but don't generate an error */

/*
** CAPI3REF: Authorizer Action Codes
**
** The [sqlite3_set_authorizer()] interface registers a callback function
** that is invoked to authorize certain SQL statement actions.  The
** second parameter to the callback is an integer code that specifies
** what action is being authorized.  These are the integer action codes that
** the authorizer callback may be passed.
**
** These action code values signify what kind of operation is to be
** authorized.  The 3rd and 4th parameters to the authorization
** callback function will be parameters or NULL depending on which of these
** codes is used as the second parameter.  ^(The 5th parameter to the
** authorizer callback is the name of the database ("main", "temp",
** etc.) if applicable.)^  ^The 6th parameter to the authorizer callback
** is the name of the inner-most trigger or view that is responsible for
** the access attempt or NULL if this access attempt is directly from
** top-level SQL code.
*/
/******************************************* 3rd ************ 4th ***********/
#define SQLITE_CREATE_INDEX          1   /* Index Name      Table Name      */
#define SQLITE_CREATE_TABLE          2   /* Table Name      NULL            */
#define SQLITE_CREATE_TEMP_INDEX     3   /* Index Name      Table Name      */
#define SQLITE_CREATE_TEMP_TABLE     4   /* Table Name      NULL            */
#define SQLITE_CREATE_TEMP_TRIGGER   5   /* Trigger Name    Table Name      */
#define SQLITE_CREATE_TEMP_VIEW      6   /* View Name       NULL            */
#define SQLITE_CREATE_TRIGGER        7   /* Trigger Name    Table Name      */
#define SQLITE_CREATE_VIEW           8   /* View Name       NULL            */
#define SQLITE_DELETE                9   /* Table Name      NULL            */
#define SQLITE_DROP_INDEX           10   /* Index Name      Table Name      */
#define SQLITE_DROP_TABLE           11   /* Table Name      NULL            */
#define SQLITE_DROP_TEMP_INDEX      12   /* Index Name      Table Name      */
#define SQLITE_DROP_TEMP_TABLE      13   /* Table Name      NULL            */
#define SQLITE_DROP_TEMP_TRIGGER    14   /* Trigger Name    Table Name      */
#define SQLITE_DROP_TEMP_VIEW       15   /* View Name       NULL            */
#define SQLITE_DROP_TRIGGER         16   /* Trigger Name    Table Name      */
#define SQLITE_DROP_VIEW            17   /* View Name       NULL            */
#define SQLITE_INSERT               18   /* Table Name      NULL            */
#define SQLITE_PRAGMA               19   /* Pragma Name     1st arg or NULL */
#define SQLITE_READ                 20   /* Table Name      Column Name     */
#define SQLITE_SELECT               21   /* NULL            NULL            */
#define SQLITE_TRANSACTION          22   /* Operation       NULL            */
#define SQLITE_UPDATE               23   /* Table Name      Column Name     */
#define SQLITE_ATTACH               24   /* Filename        NULL            */
#define SQLITE_DETACH               25   /* Database Name   NULL            */
#define SQLITE_ALTER_TABLE          26   /* Database Name   Table Name      */
#define SQLITE_REINDEX              27   /* Index Name      NULL            */
#define SQLITE_ANALYZE              28   /* Table Name      NULL            */
#define SQLITE_CREATE_VTABLE        29   /* Table Name      Module Name     */
#define SQLITE_DROP_VTABLE          30   /* Table Name      Module Name     */
#define SQLITE_FUNCTION             31   /* NULL            Function Name   */
#define SQLITE_SAVEPOINT            32   /* Operation       Savepoint Name  */
#define SQLITE_COPY                  0   /* No longer used */

/*
** CAPI3REF: Tracing And Profiling Functions
**
** These routines register callback functions that can be used for
** tracing and profiling the execution of SQL statements.
**
** ^The callback function registered by sqlite3_trace() is invoked at
** various times when an SQL statement is being run by [sqlite3_step()].
** ^The sqlite3_trace() callback is invoked with a UTF-8 rendering of the
** SQL statement text as the statement first begins executing.
** ^(Additional sqlite3_trace() callbacks might occur
** as each triggered subprogram is entered.  The callbacks for triggers
** contain a UTF-8 SQL comment that identifies the trigger.)^
**
** ^The callback function registered by sqlite3_profile() is invoked
** as each SQL statement finishes.  ^The profile callback contains
** the original statement text and an estimate of wall-clock time
** of how long that statement took to run.  ^The profile callback
** time is in units of nanoseconds, however the current implementation
** is only capable of millisecond resolution so the six least significant
** digits in the time are meaningless.  Future versions of SQLite
** might provide greater resolution on the profiler callback.  The
** sqlite3_profile() function is considered experimental and is
** subject to change in future versions of SQLite.
*/
SQLITE_API void *sqlite3_trace(sqlite3*, void(*xTrace)(void*,const char*), void*);
SQLITE_API SQLITE_EXPERIMENTAL void *sqlite3_profile(sqlite3*,
   void(*xProfile)(void*,const char*,sqlite3_uint64), void*);

/*
** CAPI3REF: Query Progress Callbacks
**
** ^The sqlite3_progress_handler(D,N,X,P) interface causes the callback
** function X to be invoked periodically during long running calls to
** [sqlite3_exec()], [sqlite3_step()] and [sqlite3_get_table()] for
** database connection D.  An example use for this
** interface is to keep a GUI updated during a large query.
**
** ^The parameter P is passed through as the only parameter to the 
** callback function X.  ^The parameter N is the number of 
** [virtual machine instructions] that are evaluated between successive
** invocations of the callback X.
**
** ^Only a single progress handler may be defined at one time per
** [database connection]; setting a new progress handler cancels the
** old one.  ^Setting parameter X to NULL disables the progress handler.
** ^The progress handler is also disabled by setting N to a value less
** than 1.
**
** ^If the progress callback returns non-zero, the operation is
** interrupted.  This feature can be used to implement a
** "Cancel" button on a GUI progress dialog box.
**
** The progress handler callback must not do anything that will modify
** the database connection that invoked the progress handler.
** Note that [sqlite3_prepare_v2()] and [sqlite3_step()] both modify their
** database connections for the meaning of "modify" in this paragraph.
**
*/
SQLITE_API void sqlite3_progress_handler(sqlite3*, int, int(*)(void*), void*);

/*
** CAPI3REF: Opening A New Database Connection
**
** ^These routines open an SQLite database file as specified by the 
** filename argument. ^The filename argument is interpreted as UTF-8 for
** sqlite3_open() and sqlite3_open_v2() and as UTF-16 in the native byte
** order for sqlite3_open16(). ^(A [database connection] handle is usually
** returned in *ppDb, even if an error occurs.  The only exception is that
** if SQLite is unable to allocate memory to hold the [sqlite3] object,
** a NULL will be written into *ppDb instead of a pointer to the [sqlite3]
** object.)^ ^(If the database is opened (and/or created) successfully, then
** [SQLITE_OK] is returned.  Otherwise an [error code] is returned.)^ ^The
** [sqlite3_errmsg()] or [sqlite3_errmsg16()] routines can be used to obtain
** an English language description of the error following a failure of any
** of the sqlite3_open() routines.
**
** ^The default encoding for the database will be UTF-8 if
** sqlite3_open() or sqlite3_open_v2() is called and
** UTF-16 in the native byte order if sqlite3_open16() is used.
**
** Whether or not an error occurs when it is opened, resources
** associated with the [database connection] handle should be released by
** passing it to [sqlite3_close()] when it is no longer required.
**
** The sqlite3_open_v2() interface works like sqlite3_open()
** except that it accepts two additional parameters for additional control
** over the new database connection.  ^(The flags parameter to
** sqlite3_open_v2() can take one of
** the following three values, optionally combined with the 
** [SQLITE_OPEN_NOMUTEX], [SQLITE_OPEN_FULLMUTEX], [SQLITE_OPEN_SHAREDCACHE],
** [SQLITE_OPEN_PRIVATECACHE], and/or [SQLITE_OPEN_URI] flags:)^
**
** <dl>
** ^(<dt>[SQLITE_OPEN_READONLY]</dt>
** <dd>The database is opened in read-only mode.  If the database does not
** already exist, an error is returned.</dd>)^
**
** ^(<dt>[SQLITE_OPEN_READWRITE]</dt>
** <dd>The database is opened for reading and writing if possible, or reading
** only if the file is write protected by the operating system.  In either
** case the database must already exist, otherwise an error is returned.</dd>)^
**
** ^(<dt>[SQLITE_OPEN_READWRITE] | [SQLITE_OPEN_CREATE]</dt>
** <dd>The database is opened for reading and writing, and is created if
** it does not already exist. This is the behavior that is always used for
** sqlite3_open() and sqlite3_open16().</dd>)^
** </dl>
**
** If the 3rd parameter to sqlite3_open_v2() is not one of the
** combinations shown above optionally combined with other
** [SQLITE_OPEN_READONLY | SQLITE_OPEN_* bits]
** then the behavior is undefined.
**
** ^If the [SQLITE_OPEN_NOMUTEX] flag is set, then the database connection
** opens in the multi-thread [threading mode] as long as the single-thread
** mode has not been set at compile-time or start-time.  ^If the
** [SQLITE_OPEN_FULLMUTEX] flag is set then the database connection opens
** in the serialized [threading mode] unless single-thread was
** previously selected at compile-time or start-time.
** ^The [SQLITE_OPEN_SHAREDCACHE] flag causes the database connection to be
** eligible to use [shared cache mode], regardless of whether or not shared
** cache is enabled using [sqlite3_enable_shared_cache()].  ^The
** [SQLITE_OPEN_PRIVATECACHE] flag causes the database connection to not
** participate in [shared cache mode] even if it is enabled.
**
** ^The fourth parameter to sqlite3_open_v2() is the name of the
** [sqlite3_vfs] object that defines the operating system interface that
** the new database connection should use.  ^If the fourth parameter is
** a NULL pointer then the default [sqlite3_vfs] object is used.
**
** ^If the filename is ":memory:", then a private, temporary in-memory database
** is created for the connection.  ^This in-memory database will vanish when
** the database connection is closed.  Future versions of SQLite might
** make use of additional special filenames that begin with the ":" character.
** It is recommended that when a database filename actually does begin with
** a ":" character you should prefix the filename with a pathname such as
** "./" to avoid ambiguity.
**
** ^If the filename is an empty string, then a private, temporary
** on-disk database will be created.  ^This private database will be
** automatically deleted as soon as the database connection is closed.
**
** [[URI filenames in sqlite3_open()]] <h3>URI Filenames</h3>
**
** ^If [URI filename] interpretation is enabled, and the filename argument
** begins with "file:", then the filename is interpreted as a URI. ^URI
** filename interpretation is enabled if the [SQLITE_OPEN_URI] flag is
** set in the fourth argument to sqlite3_open_v2(), or if it has
** been enabled globally using the [SQLITE_CONFIG_URI] option with the
** [sqlite3_config()] method or by the [SQLITE_USE_URI] compile-time option.
** As of SQLite version 3.7.7, URI filename interpretation is turned off
** by default, but future releases of SQLite might enable URI filename
** interpretation by default.  See "[URI filenames]" for additional
** information.
**
** URI filenames are parsed according to RFC 3986. ^If the URI contains an
** authority, then it must be either an empty string or the string 
** "localhost". ^If the authority is not an empty string or "localhost", an 
** error is returned to the caller. ^The fragment component of a URI, if 
** present, is ignored.
**
** ^SQLite uses the path component of the URI as the name of the disk file
** which contains the database. ^If the path begins with a '/' character, 
** then it is interpreted as an absolute path. ^If the path does not begin 
** with a '/' (meaning that the authority section is omitted from the URI)
** then the path is interpreted as a relative path. 
** ^On windows, the first component of an absolute path 
** is a drive specification (e.g. "C:").
**
** [[core URI query parameters]]
** The query component of a URI may contain parameters that are interpreted
** either by SQLite itself, or by a [VFS | custom VFS implementation].
** SQLite interprets the following three query parameters:
**
** <ul>
**   <li> <b>vfs</b>: ^The "vfs" parameter may be used to specify the name of
**     a VFS object that provides the operating system interface that should
**     be used to access the database file on disk. ^If this option is set to
**     an empty string the default VFS object is used. ^Specifying an unknown
**     VFS is an error. ^If sqlite3_open_v2() is used and the vfs option is
**     present, then the VFS specified by the option takes precedence over
**     the value passed as the fourth parameter to sqlite3_open_v2().
**
**   <li> <b>mode</b>: ^(The mode parameter may be set to either "ro", "rw" or
**     "rwc". Attempting to set it to any other value is an error)^. 
**     ^If "ro" is specified, then the database is opened for read-only 
**     access, just as if the [SQLITE_OPEN_READONLY] flag had been set in the 
**     third argument to sqlite3_prepare_v2(). ^If the mode option is set to 
**     "rw", then the database is opened for read-write (but not create) 
**     access, as if SQLITE_OPEN_READWRITE (but not SQLITE_OPEN_CREATE) had 
**     been set. ^Value "rwc" is equivalent to setting both 
**     SQLITE_OPEN_READWRITE and SQLITE_OPEN_CREATE. ^If sqlite3_open_v2() is 
**     used, it is an error to specify a value for the mode parameter that is 
**     less restrictive than that specified by the flags passed as the third 
**     parameter.
**
**   <li> <b>cache</b>: ^The cache parameter may be set to either "shared" or
**     "private". ^Setting it to "shared" is equivalent to setting the
**     SQLITE_OPEN_SHAREDCACHE bit in the flags argument passed to
**     sqlite3_open_v2(). ^Setting the cache parameter to "private" is 
**     equivalent to setting the SQLITE_OPEN_PRIVATECACHE bit.
**     ^If sqlite3_open_v2() is used and the "cache" parameter is present in
**     a URI filename, its value overrides any behaviour requested by setting
**     SQLITE_OPEN_PRIVATECACHE or SQLITE_OPEN_SHAREDCACHE flag.
** </ul>
**
** ^Specifying an unknown parameter in the query component of a URI is not an
** error.  Future versions of SQLite might understand additional query
** parameters.  See "[query parameters with special meaning to SQLite]" for
** additional information.
**
** [[URI filename examples]] <h3>URI filename examples</h3>
**
** <table border="1" align=center cellpadding=5>
** <tr><th> URI filenames <th> Results
** <tr><td> file:data.db <td> 
**          Open the file "data.db" in the current directory.
** <tr><td> file:/home/fred/data.db<br>
**          file:///home/fred/data.db <br> 
**          file://localhost/home/fred/data.db <br> <td> 
**          Open the database file "/home/fred/data.db".
** <tr><td> file://darkstar/home/fred/data.db <td> 
**          An error. "darkstar" is not a recognized authority.
** <tr><td style="white-space:nowrap"> 
**          file:///C:/Documents%20and%20Settings/fred/Desktop/data.db
**     <td> Windows only: Open the file "data.db" on fred's desktop on drive
**          C:. Note that the %20 escaping in this example is not strictly 
**          necessary - space characters can be used literally
**          in URI filenames.
** <tr><td> file:data.db?mode=ro&cache=private <td> 
**          Open file "data.db" in the current directory for read-only access.
**          Regardless of whether or not shared-cache mode is enabled by
**          default, use a private cache.
** <tr><td> file:/home/fred/data.db?vfs=unix-nolock <td>
**          Open file "/home/fred/data.db". Use the special VFS "unix-nolock".
** <tr><td> file:data.db?mode=readonly <td> 
**          An error. "readonly" is not a valid option for the "mode" parameter.
** </table>
**
** ^URI hexadecimal escape sequences (%HH) are supported within the path and
** query components of a URI. A hexadecimal escape sequence consists of a
** percent sign - "%" - followed by exactly two hexadecimal digits 
** specifying an octet value. ^Before the path or query components of a
** URI filename are interpreted, they are encoded using UTF-8 and all 
** hexadecimal escape sequences replaced by a single byte containing the
** corresponding octet. If this process generates an invalid UTF-8 encoding,
** the results are undefined.
**
** <b>Note to Windows users:</b>  The encoding used for the filename argument
** of sqlite3_open() and sqlite3_open_v2() must be UTF-8, not whatever
** codepage is currently defined.  Filenames containing international
** characters must be converted to UTF-8 prior to passing them into
** sqlite3_open() or sqlite3_open_v2().
*/
SQLITE_API int sqlite3_open(
  const char *filename,   /* Database filename (UTF-8) */
  sqlite3 **ppDb          /* OUT: SQLite db handle */
);
SQLITE_API int sqlite3_open16(
  const void *filename,   /* Database filename (UTF-16) */
  sqlite3 **ppDb          /* OUT: SQLite db handle */
);
SQLITE_API int sqlite3_open_v2(
  const char *filename,   /* Database filename (UTF-8) */
  sqlite3 **ppDb,         /* OUT: SQLite db handle */
  int flags,              /* Flags */
  const char *zVfs        /* Name of VFS module to use */
);

/*
** CAPI3REF: Obtain Values For URI Parameters
**
** This is a utility routine, useful to VFS implementations, that checks
** to see if a database file was a URI that contained a specific query 
** parameter, and if so obtains the value of the query parameter.
**
** The zFilename argument is the filename pointer passed into the xOpen()
** method of a VFS implementation.  The zParam argument is the name of the
** query parameter we seek.  This routine returns the value of the zParam
** parameter if it exists.  If the parameter does not exist, this routine
** returns a NULL pointer.
**
** If the zFilename argument to this function is not a pointer that SQLite
** passed into the xOpen VFS method, then the behavior of this routine
** is undefined and probably undesirable.
*/
SQLITE_API const char *sqlite3_uri_parameter(const char *zFilename, const char *zParam);


/*
** CAPI3REF: Error Codes And Messages
**
** ^The sqlite3_errcode() interface returns the numeric [result code] or
** [extended result code] for the most recent failed sqlite3_* API call
** associated with a [database connection]. If a prior API call failed
** but the most recent API call succeeded, the return value from
** sqlite3_errcode() is undefined.  ^The sqlite3_extended_errcode()
** interface is the same except that it always returns the 
** [extended result code] even when extended result codes are
** disabled.
**
** ^The sqlite3_errmsg() and sqlite3_errmsg16() return English-language
** text that describes the error, as either UTF-8 or UTF-16 respectively.
** ^(Memory to hold the error message string is managed internally.
** The application does not need to worry about freeing the result.
** However, the error string might be overwritten or deallocated by
** subsequent calls to other SQLite interface functions.)^
**
** When the serialized [threading mode] is in use, it might be the
** case that a second error occurs on a separate thread in between
** the time of the first error and the call to these interfaces.
** When that happens, the second error will be reported since these
** interfaces always report the most recent result.  To avoid
** this, each thread can obtain exclusive use of the [database connection] D
** by invoking [sqlite3_mutex_enter]([sqlite3_db_mutex](D)) before beginning
** to use D and invoking [sqlite3_mutex_leave]([sqlite3_db_mutex](D)) after
** all calls to the interfaces listed here are completed.
**
** If an interface fails with SQLITE_MISUSE, that means the interface
** was invoked incorrectly by the application.  In that case, the
** error code and message may or may not be set.
*/
SQLITE_API int sqlite3_errcode(sqlite3 *db);
SQLITE_API int sqlite3_extended_errcode(sqlite3 *db);
SQLITE_API const char *sqlite3_errmsg(sqlite3*);
SQLITE_API const void *sqlite3_errmsg16(sqlite3*);

/*
** CAPI3REF: SQL Statement Object
** KEYWORDS: {prepared statement} {prepared statements}
**
** An instance of this object represents a single SQL statement.
** This object is variously known as a "prepared statement" or a
** "compiled SQL statement" or simply as a "statement".
**
** The life of a statement object goes something like this:
**
** <ol>
** <li> Create the object using [sqlite3_prepare_v2()] or a related
**      function.
** <li> Bind values to [host parameters] using the sqlite3_bind_*()
**      interfaces.
** <li> Run the SQL by calling [sqlite3_step()] one or more times.
** <li> Reset the statement using [sqlite3_reset()] then go back
**      to step 2.  Do this zero or more times.
** <li> Destroy the object using [sqlite3_finalize()].
** </ol>
**
** Refer to documentation on individual methods above for additional
** information.
*/
typedef struct sqlite3_stmt sqlite3_stmt;

/*
** CAPI3REF: Run-time Limits
**
** ^(This interface allows the size of various constructs to be limited
** on a connection by connection basis.  The first parameter is the
** [database connection] whose limit is to be set or queried.  The
** second parameter is one of the [limit categories] that define a
** class of constructs to be size limited.  The third parameter is the
** new limit for that construct.)^
**
** ^If the new limit is a negative number, the limit is unchanged.
** ^(For each limit category SQLITE_LIMIT_<i>NAME</i> there is a 
** [limits | hard upper bound]
** set at compile-time by a C preprocessor macro called
** [limits | SQLITE_MAX_<i>NAME</i>].
** (The "_LIMIT_" in the name is changed to "_MAX_".))^
** ^Attempts to increase a limit above its hard upper bound are
** silently truncated to the hard upper bound.
**
** ^Regardless of whether or not the limit was changed, the 
** [sqlite3_limit()] interface returns the prior value of the limit.
** ^Hence, to find the current value of a limit without changing it,
** simply invoke this interface with the third parameter set to -1.
**
** Run-time limits are intended for use in applications that manage
** both their own internal database and also databases that are controlled
** by untrusted external sources.  An example application might be a
** web browser that has its own databases for storing history and
** separate databases controlled by JavaScript applications downloaded
** off the Internet.  The internal databases can be given the
** large, default limits.  Databases managed by external sources can
** be given much smaller limits designed to prevent a denial of service
** attack.  Developers might also want to use the [sqlite3_set_authorizer()]
** interface to further control untrusted SQL.  The size of the database
** created by an untrusted script can be contained using the
** [max_page_count] [PRAGMA]</span>
		corner_levels<span class="hl opt">[</span>k<span class="hl opt">][</span>i<span class="hl opt">] =</span> <span class="hl kwd">getCornerLevel</span><span class="hl opt">(</span>i<span class="hl opt">,</span> k<span class="hl opt">);</span>
<span class="hl opt">}</span>

f32 <span class="hl kwc">MapblockMeshGenerator</span><span class="hl opt">::</span><span class="hl kwd">getCornerLevel</span><span class="hl opt">(</span><span class="hl kwb">int</span> i<span class="hl opt">,</span> <span class="hl kwb">int</span> k<span class="hl opt">)</span>
<span class="hl opt">{</span>
	<span class="hl kwb">float</span> sum <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span>
	<span class="hl kwb">int</span> count <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span>
	<span class="hl kwb">int</span> air_count <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span>
	<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> dk <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> dk <span class="hl opt">&lt;</span> <span class="hl num">2</span><span class="hl opt">;</span> dk<span class="hl opt">++)</span>
	<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> di <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> di <span class="hl opt">&lt;</span> <span class="hl num">2</span><span class="hl opt">;</span> di<span class="hl opt">++) {</span>
		NeighborData <span class="hl opt">&amp;</span>neighbor_data <span class="hl opt">=</span> liquid_neighbors<span class="hl opt">[</span>k <span class="hl opt">+</span> dk<span class="hl opt">][</span>i <span class="hl opt">+</span> di<span class="hl opt">];</span>
		content_t content <span class="hl opt">=</span> neighbor_data<span class="hl opt">.</span>content<span class="hl opt">;</span>

		<span class="hl slc">// If top is liquid, draw starting from top of node</span>
		<span class="hl kwa">if</span> <span class="hl opt">(</span>neighbor_data<span class="hl opt">.</span>top_is_same_liquid<span class="hl opt">)</span>
			<span class="hl kwa">return</span> <span class="hl num">0.5</span> <span class="hl opt">*</span> BS<span class="hl opt">;</span>

		<span class="hl slc">// Source always has the full height</span>
		<span class="hl kwa">if</span> <span class="hl opt">(</span>content <span class="hl opt">==</span> c_source<span class="hl opt">)</span>
			<span class="hl kwa">return</span> <span class="hl num">0.5</span> <span class="hl opt">*</span> BS<span class="hl opt">;</span>

		<span class="hl slc">// Flowing liquid has level information</span>
		<span class="hl kwa">if</span> <span class="hl opt">(</span>content <span class="hl opt">==</span> c_flowing<span class="hl opt">) {</span>
			sum <span class="hl opt">+=</span> neighbor_data<span class="hl opt">.</span>level<span class="hl opt">;</span>
			count<span class="hl opt">++;</span>
		<span class="hl opt">}</span> <span class="hl kwa">else if</span> <span class="hl opt">(</span>content <span class="hl opt">==</span> CONTENT_AIR<span class="hl opt">) {</span>
			air_count<span class="hl opt">++;</span>
			<span class="hl kwa">if</span> <span class="hl opt">(</span>air_count <span class="hl opt">&gt;=</span> <span class="hl num">2</span><span class="hl opt">)</span>
				<span class="hl kwa">return</span> <span class="hl opt">-</span><span class="hl num">0.5</span> <span class="hl opt">*</span> BS <span class="hl opt">+</span> <span class="hl num">0.2</span><span class="hl opt">;</span>
		<span class="hl opt">}</span>
	<span class="hl opt">}</span>
	<span class="hl kwa">if</span> <span class="hl opt">(</span>count <span class="hl opt">&gt;</span> <span class="hl num">0</span><span class="hl opt">)</span>
		<span class="hl kwa">return</span> sum <span class="hl opt">/</span> count<span class="hl opt">;</span>
	<span class="hl kwa">return</span> <span class="hl num">0</span><span class="hl opt">;</span>
<span class="hl opt">}</span>

<span class="hl kwb">void</span> <span class="hl kwc">MapblockMeshGenerator</span><span class="hl opt">::</span><span class="hl kwd">drawLiquidSides</span><span class="hl opt">()</span>
<span class="hl opt">{</span>
	<span class="hl kwb">struct</span> LiquidFaceDesc <span class="hl opt">{</span>
		v3s16 dir<span class="hl opt">;</span> <span class="hl slc">// XZ</span>
		v3s16 p<span class="hl opt">[</span><span class="hl num">2</span><span class="hl opt">];</span> <span class="hl slc">// XZ only; 1 means +, 0 means -</span>
	<span class="hl opt">};</span>
	<span class="hl kwb">struct</span> UV <span class="hl opt">{</span>
		<span class="hl kwb">int</span> u<span class="hl opt">,</span> v<span class="hl opt">;</span>
	<span class="hl opt">};</span>
	<span class="hl kwb">static const</span> LiquidFaceDesc base_faces<span class="hl opt">[</span><span class="hl num">4</span><span class="hl opt">] = {</span>
		<span class="hl opt">{</span><span class="hl kwd">v3s16</span><span class="hl opt">(</span> <span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span>  <span class="hl num">0</span><span class="hl opt">), {</span><span class="hl kwd">v3s16</span><span class="hl opt">(</span><span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">),</span> <span class="hl kwd">v3s16</span><span class="hl opt">(</span><span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">)}},</span>
		<span class="hl opt">{</span><span class="hl kwd">v3s16</span><span class="hl opt">(-</span><span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span>  <span class="hl num">0</span><span class="hl opt">), {</span><span class="hl kwd">v3s16</span><span class="hl opt">(</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">),</span> <span class="hl kwd">v3s16</span><span class="hl opt">(</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">)}},</span>
		<span class="hl opt">{</span><span class="hl kwd">v3s16</span><span class="hl opt">(</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span>  <span class="hl num">1</span><span class="hl opt">), {</span><span class="hl kwd">v3s16</span><span class="hl opt">(</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">),</span> <span class="hl kwd">v3s16</span><span class="hl opt">(</span><span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">)}},</span>
		<span class="hl opt">{</span><span class="hl kwd">v3s16</span><span class="hl opt">(</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">, -</span><span class="hl num">1</span><span class="hl opt">), {</span><span class="hl kwd">v3s16</span><span class="hl opt">(</span><span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">),</span> <span class="hl kwd">v3s16</span><span class="hl opt">(</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">)}},</span>
	<span class="hl opt">};</span>
	<span class="hl kwb">static const</span> UV base_vertices<span class="hl opt">[</span><span class="hl num">4</span><span class="hl opt">] = {</span>
		<span class="hl opt">{</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">},</span>
		<span class="hl opt">{</span><span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">},</span>
		<span class="hl opt">{</span><span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">},</span>
		<span class="hl opt">{</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">}</span>
	<span class="hl opt">};</span>
	<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> i <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> i <span class="hl opt">&lt;</span> <span class="hl num">4</span><span class="hl opt">;</span> i<span class="hl opt">++) {</span>
		<span class="hl kwb">const</span> LiquidFaceDesc <span class="hl opt">&amp;</span>face <span class="hl opt">=</span> base_faces<span class="hl opt">[</span>i<span class="hl opt">];</span>
		<span class="hl kwb">const</span> NeighborData <span class="hl opt">&amp;</span>neighbor <span class="hl opt">=</span> liquid_neighbors<span class="hl opt">[</span>face<span class="hl opt">.</span>dir<span class="hl opt">.</span>Z <span class="hl opt">+</span> <span class="hl num">1</span><span class="hl opt">][</span>face<span class="hl opt">.</span>dir<span class="hl opt">.</span>X <span class="hl opt">+</span> <span class="hl num">1</span><span class="hl opt">];</span>

		<span class="hl slc">// No face between nodes of the same liquid, unless there is node</span>
		<span class="hl slc">// at the top to which it should be connected. Again, unless the face</span>
		<span class="hl slc">// there would be inside the liquid</span>
		<span class="hl kwa">if</span> <span class="hl opt">(</span>neighbor<span class="hl opt">.</span>is_same_liquid<span class="hl opt">) {</span>
			<span class="hl kwa">if</span> <span class="hl opt">(!</span>top_is_same_liquid<span class="hl opt">)</span>
				<span class="hl kwa">continue</span><span class="hl opt">;</span>
			<span class="hl kwa">if</span> <span class="hl opt">(</span>neighbor<span class="hl opt">.</span>top_is_same_liquid<span class="hl opt">)</span>
				<span class="hl kwa">continue</span><span class="hl opt">;</span>
		<span class="hl opt">}</span>

		<span class="hl kwb">const</span> ContentFeatures <span class="hl opt">&amp;</span>neighbor_features <span class="hl opt">=</span> nodedef<span class="hl opt">-&gt;</span><span class="hl kwd">get</span><span class="hl opt">(</span>neighbor<span class="hl opt">.</span>content<span class="hl opt">);</span>
		<span class="hl slc">// Don&apos;t draw face if neighbor is blocking the view</span>
		<span class="hl kwa">if</span> <span class="hl opt">(</span>neighbor_features<span class="hl opt">.</span>solidness <span class="hl opt">==</span> <span class="hl num">2</span><span class="hl opt">)</span>
			<span class="hl kwa">continue</span><span class="hl opt">;</span>

		<span class="hl kwc">video</span><span class="hl opt">::</span>S3DVertex vertices<span class="hl opt">[</span><span class="hl num">4</span><span class="hl opt">];</span>
		<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> j <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> j <span class="hl opt">&lt;</span> <span class="hl num">4</span><span class="hl opt">;</span> j<span class="hl opt">++) {</span>
			<span class="hl kwb">const</span> UV <span class="hl opt">&amp;</span>vertex <span class="hl opt">=</span> base_vertices<span class="hl opt">[</span>j<span class="hl opt">];</span>
			<span class="hl kwb">const</span> v3s16 <span class="hl opt">&amp;</span>base <span class="hl opt">=</span> face<span class="hl opt">.</span>p<span class="hl opt">[</span>vertex<span class="hl opt">.</span>u<span class="hl opt">];</span>
			v3f pos<span class="hl opt">;</span>
			pos<span class="hl opt">.</span>X <span class="hl opt">= (</span>base<span class="hl opt">.</span>X <span class="hl opt">-</span> <span class="hl num">0.5</span><span class="hl opt">) *</span> BS<span class="hl opt">;</span>
			pos<span class="hl opt">.</span>Z <span class="hl opt">= (</span>base<span class="hl opt">.</span>Z <span class="hl opt">-</span> <span class="hl num">0.5</span><span class="hl opt">) *</span> BS<span class="hl opt">;</span>
			<span class="hl kwa">if</span> <span class="hl opt">(</span>vertex<span class="hl opt">.</span>v<span class="hl opt">)</span>
				pos<span class="hl opt">.</span>Y <span class="hl opt">=</span> neighbor<span class="hl opt">.</span>is_same_liquid <span class="hl opt">?</span> corner_levels<span class="hl opt">[</span>base<span class="hl opt">.</span>Z<span class="hl opt">][</span>base<span class="hl opt">.</span>X<span class="hl opt">] : -</span><span class="hl num">0.5</span> <span class="hl opt">*</span> BS<span class="hl opt">;</span>
			<span class="hl kwa">else</span>
				pos<span class="hl opt">.</span>Y <span class="hl opt">=     !</span>top_is_same_liquid <span class="hl opt">?</span> corner_levels<span class="hl opt">[</span>base<span class="hl opt">.</span>Z<span class="hl opt">][</span>base<span class="hl opt">.</span>X<span class="hl opt">] :</span>  <span class="hl num">0.5</span> <span class="hl opt">*</span> BS<span class="hl opt">;</span>
			<span class="hl kwa">if</span> <span class="hl opt">(</span>data<span class="hl opt">-&gt;</span>m_smooth_lighting<span class="hl opt">)</span>
				color <span class="hl opt">=</span> <span class="hl kwd">blendLightColor</span><span class="hl opt">(</span>pos<span class="hl opt">);</span>
			pos <span class="hl opt">+=</span> origin<span class="hl opt">;</span>
			vertices<span class="hl opt">[</span>j<span class="hl opt">] =</span> <span class="hl kwc">video</span><span class="hl opt">::</span><span class="hl kwd">S3DVertex</span><span class="hl opt">(</span>pos<span class="hl opt">.</span>X<span class="hl opt">,</span> pos<span class="hl opt">.</span>Y<span class="hl opt">,</span> pos<span class="hl opt">.</span>Z<span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> color<span class="hl opt">,</span> vertex<span class="hl opt">.</span>u<span class="hl opt">,</span> vertex<span class="hl opt">.</span>v<span class="hl opt">);</span>
		<span class="hl opt">};</span>
		collector<span class="hl opt">-&gt;</span><span class="hl kwd">append</span><span class="hl opt">(</span>tile_liquid<span class="hl opt">,</span> vertices<span class="hl opt">,</span> <span class="hl num">4</span><span class="hl opt">,</span> quad_indices<span class="hl opt">,</span> <span class="hl num">6</span><span class="hl opt">);</span>
	<span class="hl opt">}</span>
<span class="hl opt">}</span>

<span class="hl kwb">void</span> <span class="hl kwc">MapblockMeshGenerator</span><span class="hl opt">::</span><span class="hl kwd">drawLiquidTop</span><span class="hl opt">()</span>
<span class="hl opt">{</span>
	<span class="hl slc">// To get backface culling right, the vertices need to go</span>
	<span class="hl slc">// clockwise around the front of the face. And we happened to</span>
	<span class="hl slc">// calculate corner levels in exact reverse order.</span>
	<span class="hl kwb">static const int</span> corner_resolve<span class="hl opt">[</span><span class="hl num">4</span><span class="hl opt">][</span><span class="hl num">2</span><span class="hl opt">] = {{</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">}, {</span><span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">}, {</span><span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">}, {</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">}};</span>

	<span class="hl kwc">video</span><span class="hl opt">::</span>S3DVertex vertices<span class="hl opt">[</span><span class="hl num">4</span><span class="hl opt">] = {</span>
		<span class="hl kwc">video</span><span class="hl opt">::</span><span class="hl kwd">S3DVertex</span><span class="hl opt">(-</span>BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span>  BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> color_liquid_top<span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">),</span>
		<span class="hl kwc">video</span><span class="hl opt">::</span><span class="hl kwd">S3DVertex</span><span class="hl opt">(</span> BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span>  BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> color_liquid_top<span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">),</span>
		<span class="hl kwc">video</span><span class="hl opt">::</span><span class="hl kwd">S3DVertex</span><span class="hl opt">(</span> BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> color_liquid_top<span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">),</span>
		<span class="hl kwc">video</span><span class="hl opt">::</span><span class="hl kwd">S3DVertex</span><span class="hl opt">(-</span>BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> color_liquid_top<span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">),</span>
	<span class="hl opt">};</span>

	<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> i <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> i <span class="hl opt">&lt;</span> <span class="hl num">4</span><span class="hl opt">;</span> i<span class="hl opt">++) {</span>
		<span class="hl kwb">int</span> u <span class="hl opt">=</span> corner_resolve<span class="hl opt">[</span>i<span class="hl opt">][</span><span class="hl num">0</span><span class="hl opt">];</span>
		<span class="hl kwb">int</span> w <span class="hl opt">=</span> corner_resolve<span class="hl opt">[</span>i<span class="hl opt">][</span><span class="hl num">1</span><span class="hl opt">];</span>
		vertices<span class="hl opt">[</span>i<span class="hl opt">].</span>Pos<span class="hl opt">.</span>Y <span class="hl opt">+=</span> corner_levels<span class="hl opt">[</span>w<span class="hl opt">][</span>u<span class="hl opt">];</span>
		<span class="hl kwa">if</span> <span class="hl opt">(</span>data<span class="hl opt">-&gt;</span>m_smooth_lighting<span class="hl opt">)</span>
			vertices<span class="hl opt">[</span>i<span class="hl opt">].</span>Color <span class="hl opt">=</span> <span class="hl kwd">blendLightColor</span><span class="hl opt">(</span>vertices<span class="hl opt">[</span>i<span class="hl opt">].</span>Pos<span class="hl opt">);</span>
		vertices<span class="hl opt">[</span>i<span class="hl opt">].</span>Pos <span class="hl opt">+=</span> origin<span class="hl opt">;</span>
	<span class="hl opt">}</span>

	<span class="hl slc">// Default downwards-flowing texture animation goes from</span>
	<span class="hl slc">// -Z towards +Z, thus the direction is +Z.</span>
	<span class="hl slc">// Rotate texture to make animation go in flow direction</span>
	<span class="hl slc">// Positive if liquid moves towards +Z</span>
	f32 dz <span class="hl opt">= (</span>corner_levels<span class="hl opt">[</span><span class="hl num">0</span><span class="hl opt">][</span><span class="hl num">0</span><span class="hl opt">] +</span> corner_levels<span class="hl opt">[</span><span class="hl num">0</span><span class="hl opt">][</span><span class="hl num">1</span><span class="hl opt">]) -</span>
	         <span class="hl opt">(</span>corner_levels<span class="hl opt">[</span><span class="hl num">1</span><span class="hl opt">][</span><span class="hl num">0</span><span class="hl opt">] +</span> corner_levels<span class="hl opt">[</span><span class="hl num">1</span><span class="hl opt">][</span><span class="hl num">1</span><span class="hl opt">]);</span>
	<span class="hl slc">// Positive if liquid moves towards +X</span>
	f32 dx <span class="hl opt">= (</span>corner_levels<span class="hl opt">[</span><span class="hl num">0</span><span class="hl opt">][</span><span class="hl num">0</span><span class="hl opt">] +</span> corner_levels<span class="hl opt">[</span><span class="hl num">1</span><span class="hl opt">][</span><span class="hl num">0</span><span class="hl opt">]) -</span>
	         <span class="hl opt">(</span>corner_levels<span class="hl opt">[</span><span class="hl num">0</span><span class="hl opt">][</span><span class="hl num">1</span><span class="hl opt">] +</span> corner_levels<span class="hl opt">[</span><span class="hl num">1</span><span class="hl opt">][</span><span class="hl num">1</span><span class="hl opt">]);</span>
	f32 tcoord_angle <span class="hl opt">=</span> <span class="hl kwd">atan2</span><span class="hl opt">(</span>dz<span class="hl opt">,</span> dx<span class="hl opt">) *</span> <span class="hl kwc">core</span><span class="hl opt">::</span>RADTODEG<span class="hl opt">;</span>
	v2f <span class="hl kwd">tcoord_center</span><span class="hl opt">(</span><span class="hl num">0.5</span><span class="hl opt">,</span> <span class="hl num">0.5</span><span class="hl opt">);</span>
	v2f <span class="hl kwd">tcoord_translate</span><span class="hl opt">(</span>blockpos_nodes<span class="hl opt">.</span>Z <span class="hl opt">+</span> p<span class="hl opt">.</span>Z<span class="hl opt">,</span> blockpos_nodes<span class="hl opt">.</span>X <span class="hl opt">+</span> p<span class="hl opt">.</span>X<span class="hl opt">);</span>
	tcoord_translate<span class="hl opt">.</span><span class="hl kwd">rotateBy</span><span class="hl opt">(</span>tcoord_angle<span class="hl opt">);</span>
	tcoord_translate<span class="hl opt">.</span>X <span class="hl opt">-=</span> <span class="hl kwd">floor</span><span class="hl opt">(</span>tcoord_translate<span class="hl opt">.</span>X<span class="hl opt">);</span>
	tcoord_translate<span class="hl opt">.</span>Y <span class="hl opt">-=</span> <span class="hl kwd">floor</span><span class="hl opt">(</span>tcoord_translate<span class="hl opt">.</span>Y<span class="hl opt">);</span>

	<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> i <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> i <span class="hl opt">&lt;</span> <span class="hl num">4</span><span class="hl opt">;</span> i<span class="hl opt">++) {</span>
		vertices<span class="hl opt">[</span>i<span class="hl opt">].</span>TCoords<span class="hl opt">.</span><span class="hl kwd">rotateBy</span><span class="hl opt">(</span>tcoord_angle<span class="hl opt">,</span> tcoord_center<span class="hl opt">);</span>
		vertices<span class="hl opt">[</span>i<span class="hl opt">].</span>TCoords <span class="hl opt">+=</span> tcoord_translate<span class="hl opt">;</span>
	<span class="hl opt">}</span>

	<span class="hl kwc">std</span><span class="hl opt">::</span><span class="hl kwd">swap</span><span class="hl opt">(</span>vertices<span class="hl opt">[</span><span class="hl num">0</span><span class="hl opt">].</span>TCoords<span class="hl opt">,</span> vertices<span class="hl opt">[</span><span class="hl num">2</span><span class="hl opt">].</span>TCoords<span class="hl opt">);</span>

	collector<span class="hl opt">-&gt;</span><span class="hl kwd">append</span><span class="hl opt">(</span>tile_liquid_top<span class="hl opt">,</span> vertices<span class="hl opt">,</span> <span class="hl num">4</span><span class="hl opt">,</span> quad_indices<span class="hl opt">,</span> <span class="hl num">6</span><span class="hl opt">);</span>
<span class="hl opt">}</span>

<span class="hl kwb">void</span> <span class="hl kwc">MapblockMeshGenerator</span><span class="hl opt">::</span><span class="hl kwd">drawLiquidNode</span><span class="hl opt">()</span>
<span class="hl opt">{</span>
	<span class="hl kwd">prepareLiquidNodeDrawing</span><span class="hl opt">();</span>
	<span class="hl kwd">getLiquidNeighborhood</span><span class="hl opt">();</span>
	<span class="hl kwd">calculateCornerLevels</span><span class="hl opt">();</span>
	<span class="hl kwd">drawLiquidSides</span><span class="hl opt">();</span>
	<span class="hl kwa">if</span> <span class="hl opt">(!</span>top_is_same_liquid<span class="hl opt">)</span>
		<span class="hl kwd">drawLiquidTop</span><span class="hl opt">();</span>
<span class="hl opt">}</span>

<span class="hl kwb">void</span> <span class="hl kwc">MapblockMeshGenerator</span><span class="hl opt">::</span><span class="hl kwd">drawGlasslikeNode</span><span class="hl opt">()</span>
<span class="hl opt">{</span>
	<span class="hl kwd">useTile</span><span class="hl opt">(</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">);</span>

	<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> face <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> face <span class="hl opt">&lt;</span> <span class="hl num">6</span><span class="hl opt">;</span> face<span class="hl opt">++) {</span>
		<span class="hl slc">// Check this neighbor</span>
		v3s16 dir <span class="hl opt">=</span> g_6dirs<span class="hl opt">[</span>face<span class="hl opt">];</span>
		v3s16 neighbor_pos <span class="hl opt">=</span> blockpos_nodes <span class="hl opt">+</span> p <span class="hl opt">+</span> dir<span class="hl opt">;</span>
		MapNode neighbor <span class="hl opt">=</span> data<span class="hl opt">-&gt;</span>m_vmanip<span class="hl opt">.</span><span class="hl kwd">getNodeNoExNoEmerge</span><span class="hl opt">(</span>neighbor_pos<span class="hl opt">);</span>
		<span class="hl slc">// Don&apos;t make face if neighbor is of same type</span>
		<span class="hl kwa">if</span> <span class="hl opt">(</span>neighbor<span class="hl opt">.</span><span class="hl kwd">getContent</span><span class="hl opt">() ==</span> n<span class="hl opt">.</span><span class="hl kwd">getContent</span><span class="hl opt">())</span>
			<span class="hl kwa">continue</span><span class="hl opt">;</span>
		<span class="hl slc">// Face at Z-</span>
		v3f vertices<span class="hl opt">[</span><span class="hl num">4</span><span class="hl opt">] = {</span>
			<span class="hl kwd">v3f</span><span class="hl opt">(-</span>BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">,</span>  BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">),</span>
			<span class="hl kwd">v3f</span><span class="hl opt">(</span> BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">,</span>  BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">),</span>
			<span class="hl kwd">v3f</span><span class="hl opt">(</span> BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">),</span>
			<span class="hl kwd">v3f</span><span class="hl opt">(-</span>BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">),</span>
		<span class="hl opt">};</span>
		<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> i <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> i <span class="hl opt">&lt;</span> <span class="hl num">4</span><span class="hl opt">;</span> i<span class="hl opt">++) {</span>
			<span class="hl kwa">switch</span> <span class="hl opt">(</span>face<span class="hl opt">) {</span>
				<span class="hl kwa">case</span> D6D_ZP<span class="hl opt">:</span> vertices<span class="hl opt">[</span>i<span class="hl opt">].</span><span class="hl kwd">rotateXZBy</span><span class="hl opt">(</span><span class="hl num">180</span><span class="hl opt">);</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
				<span class="hl kwa">case</span> D6D_YP<span class="hl opt">:</span> vertices<span class="hl opt">[</span>i<span class="hl opt">].</span><span class="hl kwd">rotateYZBy</span><span class="hl opt">(</span> <span class="hl num">90</span><span class="hl opt">);</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
				<span class="hl kwa">case</span> D6D_XP<span class="hl opt">:</span> vertices<span class="hl opt">[</span>i<span class="hl opt">].</span><span class="hl kwd">rotateXZBy</span><span class="hl opt">(</span> <span class="hl num">90</span><span class="hl opt">);</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
				<span class="hl kwa">case</span> D6D_ZN<span class="hl opt">:</span> vertices<span class="hl opt">[</span>i<span class="hl opt">].</span><span class="hl kwd">rotateXZBy</span><span class="hl opt">(</span>  <span class="hl num">0</span><span class="hl opt">);</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
				<span class="hl kwa">case</span> D6D_YN<span class="hl opt">:</span> vertices<span class="hl opt">[</span>i<span class="hl opt">].</span><span class="hl kwd">rotateYZBy</span><span class="hl opt">(-</span><span class="hl num">90</span><span class="hl opt">);</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
				<span class="hl kwa">case</span> D6D_XN<span class="hl opt">:</span> vertices<span class="hl opt">[</span>i<span class="hl opt">].</span><span class="hl kwd">rotateXZBy</span><span class="hl opt">(-</span><span class="hl num">90</span><span class="hl opt">);</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
			<span class="hl opt">}</span>
		<span class="hl opt">}</span>
		<span class="hl kwd">drawQuad</span><span class="hl opt">(</span>vertices<span class="hl opt">,</span> dir<span class="hl opt">);</span>
	<span class="hl opt">}</span>
<span class="hl opt">}</span>

<span class="hl kwb">void</span> <span class="hl kwc">MapblockMeshGenerator</span><span class="hl opt">::</span><span class="hl kwd">drawGlasslikeFramedNode</span><span class="hl opt">()</span>
<span class="hl opt">{</span>
	TileSpec tiles<span class="hl opt">[</span><span class="hl num">6</span><span class="hl opt">];</span>
	<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> face <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> face <span class="hl opt">&lt;</span> <span class="hl num">6</span><span class="hl opt">;</span> face<span class="hl opt">++)</span>
		<span class="hl kwd">getTile</span><span class="hl opt">(</span>g_6dirs<span class="hl opt">[</span>face<span class="hl opt">], &amp;</span>tiles<span class="hl opt">[</span>face<span class="hl opt">]);</span>

	TileSpec glass_tiles<span class="hl opt">[</span><span class="hl num">6</span><span class="hl opt">];</span>
	<span class="hl kwa">if</span> <span class="hl opt">(</span>tiles<span class="hl opt">[</span><span class="hl num">1</span><span class="hl opt">].</span>layers<span class="hl opt">[</span><span class="hl num">0</span><span class="hl opt">].</span>texture <span class="hl opt">&amp;&amp;</span>
			tiles<span class="hl opt">[</span><span class="hl num">2</span><span class="hl opt">].</span>layers<span class="hl opt">[</span><span class="hl num">0</span><span class="hl opt">].</span>texture <span class="hl opt">&amp;&amp;</span>
			tiles<span class="hl opt">[</span><span class="hl num">3</span><span class="hl opt">].</span>layers<span class="hl opt">[</span><span class="hl num">0</span><span class="hl opt">].</span>texture<span class="hl opt">) {</span>
		glass_tiles<span class="hl opt">[</span><span class="hl num">0</span><span class="hl opt">] =</span> tiles<span class="hl opt">[</span><span class="hl num">4</span><span class="hl opt">];</span>
		glass_tiles<span class="hl opt">[</span><span class="hl num">1</span><span class="hl opt">] =</span> tiles<span class="hl opt">[</span><span class="hl num">0</span><span class="hl opt">];</span>
		glass_tiles<span class="hl opt">[</span><span class="hl num">2</span><span class="hl opt">] =</span> tiles<span class="hl opt">[</span><span class="hl num">4</span><span class="hl opt">];</span>
		glass_tiles<span class="hl opt">[</span><span class="hl num">3</span><span class="hl opt">] =</span> tiles<span class="hl opt">[</span><span class="hl num">4</span><span class="hl opt">];</span>
		glass_tiles<span class="hl opt">[</span><span class="hl num">4</span><span class="hl opt">] =</span> tiles<span class="hl opt">[</span><span class="hl num">3</span><span class="hl opt">];</span>
		glass_tiles<span class="hl opt">[</span><span class="hl num">5</span><span class="hl opt">] =</span> tiles<span class="hl opt">[</span><span class="hl num">4</span><span class="hl opt">];</span>
	<span class="hl opt">}</span> <span class="hl kwa">else</span> <span class="hl opt">{</span>
		<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> face <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> face <span class="hl opt">&lt;</span> <span class="hl num">6</span><span class="hl opt">;</span> face<span class="hl opt">++)</span>
			glass_tiles<span class="hl opt">[</span>face<span class="hl opt">] =</span> tiles<span class="hl opt">[</span><span class="hl num">4</span><span class="hl opt">];</span>
	<span class="hl opt">}</span>

	u8 param2 <span class="hl opt">=</span> n<span class="hl opt">.</span><span class="hl kwd">getParam2</span><span class="hl opt">();</span>
	<span class="hl kwb">bool</span> H_merge <span class="hl opt">= !(</span>param2 <span class="hl opt">&amp;</span> <span class="hl num">128</span><span class="hl opt">);</span>
	<span class="hl kwb">bool</span> V_merge <span class="hl opt">= !(</span>param2 <span class="hl opt">&amp;</span> <span class="hl num">64</span><span class="hl opt">);</span>
	param2 <span class="hl opt">&amp;=</span> <span class="hl num">63</span><span class="hl opt">;</span>

	<span class="hl kwb">static const float</span> a <span class="hl opt">=</span> BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">;</span>
	<span class="hl kwb">static const float</span> g <span class="hl opt">=</span> a <span class="hl opt">-</span> <span class="hl num">0.003</span><span class="hl opt">;</span>
	<span class="hl kwb">static const float</span> b <span class="hl opt">=</span> <span class="hl num">.876</span> <span class="hl opt">* (</span> BS <span class="hl opt">/</span> <span class="hl num">2</span> <span class="hl opt">);</span>

	<span class="hl kwb">static const</span> aabb3f frame_edges<span class="hl opt">[</span>FRAMED_EDGE_COUNT<span class="hl opt">] = {</span>
		<span class="hl kwd">aabb3f</span><span class="hl opt">(</span> b<span class="hl opt">,</span>  b<span class="hl opt">, -</span>a<span class="hl opt">,</span>  a<span class="hl opt">,</span>  a<span class="hl opt">,</span>  a<span class="hl opt">),</span> <span class="hl slc">// y+</span>
		<span class="hl kwd">aabb3f</span><span class="hl opt">(-</span>a<span class="hl opt">,</span>  b<span class="hl opt">, -</span>a<span class="hl opt">, -</span>b<span class="hl opt">,</span>  a<span class="hl opt">,</span>  a<span class="hl opt">),</span> <span class="hl slc">// y+</span>
		<span class="hl kwd">aabb3f</span><span class="hl opt">(</span> b<span class="hl opt">, -</span>a<span class="hl opt">, -</span>a<span class="hl opt">,</span>  a<span class="hl opt">, -</span>b<span class="hl opt">,</span>  a<span class="hl opt">),</span> <span class="hl slc">// y-</span>
		<span class="hl kwd">aabb3f</span><span class="hl opt">(-</span>a<span class="hl opt">, -</span>a<span class="hl opt">, -</span>a<span class="hl opt">, -</span>b<span class="hl opt">, -</span>b<span class="hl opt">,</span>  a<span class="hl opt">),</span> <span class="hl slc">// y-</span>
		<span class="hl kwd">aabb3f</span><span class="hl opt">(</span> b<span class="hl opt">, -</span>a<span class="hl opt">,</span>  b<span class="hl opt">,</span>  a<span class="hl opt">,</span>  a<span class="hl opt">,</span>  a<span class="hl opt">),</span> <span class="hl slc">// x+</span>
		<span class="hl kwd">aabb3f</span><span class="hl opt">(</span> b<span class="hl opt">, -</span>a<span class="hl opt">, -</span>a<span class="hl opt">,</span>  a<span class="hl opt">,</span>  a<span class="hl opt">, -</span>b<span class="hl opt">),</span> <span class="hl slc">// x+</span>
		<span class="hl kwd">aabb3f</span><span class="hl opt">(-</span>a<span class="hl opt">, -</span>a<span class="hl opt">,</span>  b<span class="hl opt">, -</span>b<span class="hl opt">,</span>  a<span class="hl opt">,</span>  a<span class="hl opt">),</span> <span class="hl slc">// x-</span>
		<span class="hl kwd">aabb3f</span><span class="hl opt">(-</span>a<span class="hl opt">, -</span>a<span class="hl opt">, -</span>a<span class="hl opt">, -</span>b<span class="hl opt">,</span>  a<span class="hl opt">, -</span>b<span class="hl opt">),</span> <span class="hl slc">// x-</span>
		<span class="hl kwd">aabb3f</span><span class="hl opt">(-</span>a<span class="hl opt">,</span>  b<span class="hl opt">,</span>  b<span class="hl opt">,</span>  a<span class="hl opt">,</span>  a<span class="hl opt">,</span>  a<span class="hl opt">),</span> <span class="hl slc">// z+</span>
		<span class="hl kwd">aabb3f</span><span class="hl opt">(-</span>a<span class="hl opt">, -</span>a<span class="hl opt">,</span>  b<span class="hl opt">,</span>  a<span class="hl opt">, -</span>b<span class="hl opt">,</span>  a<span class="hl opt">),</span> <span class="hl slc">// z+</span>
		<span class="hl kwd">aabb3f</span><span class="hl opt">(-</span>a<span class="hl opt">, -</span>a<span class="hl opt">, -</span>a<span class="hl opt">,</span>  a<span class="hl opt">, -</span>b<span class="hl opt">, -</span>b<span class="hl opt">),</span> <span class="hl slc">// z-</span>
		<span class="hl kwd">aabb3f</span><span class="hl opt">(-</span>a<span class="hl opt">,</span>  b<span class="hl opt">, -</span>a<span class="hl opt">,</span>  a<span class="hl opt">,</span>  a<span class="hl opt">, -</span>b<span class="hl opt">),</span> <span class="hl slc">// z-</span>
	<span class="hl opt">};</span>
	<span class="hl kwb">static const</span> aabb3f glass_faces<span class="hl opt">[</span><span class="hl num">6</span><span class="hl opt">] = {</span>
		<span class="hl kwd">aabb3f</span><span class="hl opt">(-</span>g<span class="hl opt">, -</span>g<span class="hl opt">,</span>  g<span class="hl opt">,</span>  g<span class="hl opt">,</span>  g<span class="hl opt">,</span>  g<span class="hl opt">),</span> <span class="hl slc">// z+</span>
		<span class="hl kwd">aabb3f</span><span class="hl opt">(-</span>g<span class="hl opt">,</span>  g<span class="hl opt">, -</span>g<span class="hl opt">,</span>  g<span class="hl opt">,</span>  g<span class="hl opt">,</span>  g<span class="hl opt">),</span> <span class="hl slc">// y+</span>
		<span class="hl kwd">aabb3f</span><span class="hl opt">(</span> g<span class="hl opt">, -</span>g<span class="hl opt">, -</span>g<span class="hl opt">,</span>  g<span class="hl opt">,</span>  g<span class="hl opt">,</span>  g<span class="hl opt">),</span> <span class="hl slc">// x+</span>
		<span class="hl kwd">aabb3f</span><span class="hl opt">(-</span>g<span class="hl opt">, -</span>g<span class="hl opt">, -</span>g<span class="hl opt">,</span>  g<span class="hl opt">,</span>  g<span class="hl opt">, -</span>g<span class="hl opt">),</span> <span class="hl slc">// z-</span>
		<span class="hl kwd">aabb3f</span><span class="hl opt">(-</span>g<span class="hl opt">, -</span>g<span class="hl opt">, -</span>g<span class="hl opt">,</span>  g<span class="hl opt">, -</span>g<span class="hl opt">,</span>  g<span class="hl opt">),</span> <span class="hl slc">// y-</span>
		<span class="hl kwd">aabb3f</span><span class="hl opt">(-</span>g<span class="hl opt">, -</span>g<span class="hl opt">, -</span>g<span class="hl opt">, -</span>g<span class="hl opt">,</span>  g<span class="hl opt">,</span>  g<span class="hl opt">),</span> <span class="hl slc">// x-</span>
	<span class="hl opt">};</span>

	<span class="hl slc">// tables of neighbour (connect if same type and merge allowed),</span>
	<span class="hl slc">// checked with g_26dirs</span>

	<span class="hl slc">// 1 = connect, 0 = face visible</span>
	<span class="hl kwb">bool</span> nb<span class="hl opt">[</span>FRAMED_NEIGHBOR_COUNT<span class="hl opt">] = {</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">};</span>

	<span class="hl slc">// 1 = check</span>
	<span class="hl kwb">static const bool</span> check_nb_vertical   <span class="hl opt">[</span>FRAMED_NEIGHBOR_COUNT<span class="hl opt">] = {</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">1</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">1</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">};</span>
	<span class="hl kwb">static const bool</span> check_nb_horizontal <span class="hl opt">[</span>FRAMED_NEIGHBOR_COUNT<span class="hl opt">] = {</span><span class="hl num">1</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">1</span><span class="hl opt">,</span><span class="hl num">1</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">,</span><span class="hl num">1</span><span class="hl opt">,</span><span class="hl num">1</span><span class="hl opt">,</span><span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">,</span><span class="hl num">0</span><span class="hl opt">};</span>
	<span class="hl kwb">static const bool</span> check_nb_all        <span class="hl opt">[</span>FRAMED_NEIGHBOR_COUNT<span class="hl opt">] = {</span><span class="hl num">1</span><span class="hl opt">,</span><span class="hl num">1</span><span class="hl opt">,</span><span class="hl num">1</span><span class="hl opt">,</span><span class="hl num">1</span><span class="hl opt">,</span><span class="hl num">1</span><span class="hl opt">,</span><span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">,</span><span class="hl num">1</span><span class="hl opt">,</span><span class="hl num">1</span><span class="hl opt">,</span><span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">,</span><span class="hl num">1</span><span class="hl opt">,</span><span class="hl num">1</span><span class="hl opt">,</span><span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">,</span><span class="hl num">1</span><span class="hl opt">,</span><span class="hl num">1</span><span class="hl opt">,</span><span class="hl num">1</span><span class="hl opt">};</span>
	<span class="hl kwb">const bool</span> <span class="hl opt">*</span>check_nb <span class="hl opt">=</span> check_nb_all<span class="hl opt">;</span>

	<span class="hl slc">// neighbours checks for frames visibility</span>
	<span class="hl kwa">if</span> <span class="hl opt">(</span>H_merge <span class="hl opt">||</span> V_merge<span class="hl opt">) {</span>
		<span class="hl kwa">if</span> <span class="hl opt">(!</span>H_merge<span class="hl opt">)</span>
			check_nb <span class="hl opt">=</span> check_nb_vertical<span class="hl opt">;</span> <span class="hl slc">// vertical-only merge</span>
		<span class="hl kwa">if</span> <span class="hl opt">(!</span>V_merge<span class="hl opt">)</span>
			check_nb <span class="hl opt">=</span> check_nb_horizontal<span class="hl opt">;</span> <span class="hl slc">// horizontal-only merge</span>
		content_t current <span class="hl opt">=</span> n<span class="hl opt">.</span><span class="hl kwd">getContent</span><span class="hl opt">();</span>
		<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> i <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> i <span class="hl opt">&lt;</span> FRAMED_NEIGHBOR_COUNT<span class="hl opt">;</span> i<span class="hl opt">++) {</span>
			<span class="hl kwa">if</span> <span class="hl opt">(!</span>check_nb<span class="hl opt">[</span>i<span class="hl opt">])</span>
				<span class="hl kwa">continue</span><span class="hl opt">;</span>
			v3s16 n2p <span class="hl opt">=</span> blockpos_nodes <span class="hl opt">+</span> p <span class="hl opt">+</span> g_26dirs<span class="hl opt">[</span>i<span class="hl opt">];</span>
			MapNode n2 <span class="hl opt">=</span> data<span class="hl opt">-&gt;</span>m_vmanip<span class="hl opt">.</span><span class="hl kwd">getNodeNoEx</span><span class="hl opt">(</span>n2p<span class="hl opt">);</span>
			content_t n2c <span class="hl opt">=</span> n2<span class="hl opt">.</span><span class="hl kwd">getContent</span><span class="hl opt">();</span>
			<span class="hl kwa">if</span> <span class="hl opt">(</span>n2c <span class="hl opt">==</span> current <span class="hl opt">||</span> n2c <span class="hl opt">==</span> CONTENT_IGNORE<span class="hl opt">)</span>
				nb<span class="hl opt">[</span>i<span class="hl opt">] =</span> <span class="hl num">1</span><span class="hl opt">;</span>
		<span class="hl opt">}</span>
	<span class="hl opt">}</span>

	<span class="hl slc">// edge visibility</span>

	<span class="hl kwb">static const</span> u8 nb_triplet<span class="hl opt">[</span>FRAMED_EDGE_COUNT<span class="hl opt">][</span><span class="hl num">3</span><span class="hl opt">] = {</span>
		<span class="hl opt">{</span><span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">2</span><span class="hl opt">,</span>  <span class="hl num">7</span><span class="hl opt">}, {</span><span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">5</span><span class="hl opt">,</span>  <span class="hl num">6</span><span class="hl opt">}, {</span><span class="hl num">4</span><span class="hl opt">,</span> <span class="hl num">2</span><span class="hl opt">,</span> <span class="hl num">15</span><span class="hl opt">}, {</span><span class="hl num">4</span><span class="hl opt">,</span> <span class="hl num">5</span><span class="hl opt">,</span> <span class="hl num">14</span><span class="hl opt">},</span>
		<span class="hl opt">{</span><span class="hl num">2</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">11</span><span class="hl opt">}, {</span><span class="hl num">2</span><span class="hl opt">,</span> <span class="hl num">3</span><span class="hl opt">,</span> <span class="hl num">13</span><span class="hl opt">}, {</span><span class="hl num">5</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">10</span><span class="hl opt">}, {</span><span class="hl num">5</span><span class="hl opt">,</span> <span class="hl num">3</span><span class="hl opt">,</span> <span class="hl num">12</span><span class="hl opt">},</span>
		<span class="hl opt">{</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">,</span>  <span class="hl num">8</span><span class="hl opt">}, {</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">4</span><span class="hl opt">,</span> <span class="hl num">16</span><span class="hl opt">}, {</span><span class="hl num">3</span><span class="hl opt">,</span> <span class="hl num">4</span><span class="hl opt">,</span> <span class="hl num">17</span><span class="hl opt">}, {</span><span class="hl num">3</span><span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">,</span>  <span class="hl num">9</span><span class="hl opt">},</span>
	<span class="hl opt">};</span>

	tile <span class="hl opt">=</span> tiles<span class="hl opt">[</span><span class="hl num">1</span><span class="hl opt">];</span>
	<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> edge <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> edge <span class="hl opt">&lt;</span> FRAMED_EDGE_COUNT<span class="hl opt">;</span> edge<span class="hl opt">++) {</span>
		<span class="hl kwb">bool</span> edge_invisible<span class="hl opt">;</span>
		<span class="hl kwa">if</span> <span class="hl opt">(</span>nb<span class="hl opt">[</span>nb_triplet<span class="hl opt">[</span>edge<span class="hl opt">][</span><span class="hl num">2</span><span class="hl opt">]])</span>
			edge_invisible <span class="hl opt">=</span> nb<span class="hl opt">[</span>nb_triplet<span class="hl opt">[</span>edge<span class="hl opt">][</span><span class="hl num">0</span><span class="hl opt">]] &amp;</span> nb<span class="hl opt">[</span>nb_triplet<span class="hl opt">[</span>edge<span class="hl opt">][</span><span class="hl num">1</span><span class="hl opt">]];</span>
		<span class="hl kwa">else</span>
			edge_invisible <span class="hl opt">=</span> nb<span class="hl opt">[</span>nb_triplet<span class="hl opt">[</span>edge<span class="hl opt">][</span><span class="hl num">0</span><span class="hl opt">]] ^</span> nb<span class="hl opt">[</span>nb_triplet<span class="hl opt">[</span>edge<span class="hl opt">][</span><span class="hl num">1</span><span class="hl opt">]];</span>
		<span class="hl kwa">if</span> <span class="hl opt">(</span>edge_invisible<span class="hl opt">)</span>
			<span class="hl kwa">continue</span><span class="hl opt">;</span>
		<span class="hl kwd">drawAutoLightedCuboid</span><span class="hl opt">(</span>frame_edges<span class="hl opt">[</span>edge<span class="hl opt">]);</span>
	<span class="hl opt">}</span>

	<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> face <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> face <span class="hl opt">&lt;</span> <span class="hl num">6</span><span class="hl opt">;</span> face<span class="hl opt">++) {</span>
		<span class="hl kwa">if</span> <span class="hl opt">(</span>nb<span class="hl opt">[</span>face<span class="hl opt">])</span>
			<span class="hl kwa">continue</span><span class="hl opt">;</span>
		tile <span class="hl opt">=</span> glass_tiles<span class="hl opt">[</span>face<span class="hl opt">];</span>
		<span class="hl kwd">drawAutoLightedCuboid</span><span class="hl opt">(</span>glass_faces<span class="hl opt">[</span>face<span class="hl opt">]);</span>
	<span class="hl opt">}</span>

	<span class="hl slc">// Optionally render internal liquid level defined by param2</span>
	<span class="hl slc">// Liquid is textured with 1 tile defined in nodedef &apos;special_tiles&apos;</span>
	<span class="hl kwa">if</span> <span class="hl opt">(</span>param2 <span class="hl opt">&gt;</span> <span class="hl num">0</span> <span class="hl opt">&amp;&amp;</span> f<span class="hl opt">-&gt;</span>param_type_2 <span class="hl opt">==</span> CPT2_GLASSLIKE_LIQUID_LEVEL <span class="hl opt">&amp;&amp;</span>
			f<span class="hl opt">-&gt;</span>special_tiles<span class="hl opt">[</span><span class="hl num">0</span><span class="hl opt">].</span>layers<span class="hl opt">[</span><span class="hl num">0</span><span class="hl opt">].</span>texture<span class="hl opt">) {</span>
		<span class="hl slc">// Internal liquid level has param2 range 0 .. 63,</span>
		<span class="hl slc">// convert it to -0.5 .. 0.5</span>
		<span class="hl kwb">float</span> vlev <span class="hl opt">= (</span>param2 <span class="hl opt">/</span> <span class="hl num">63.0</span><span class="hl opt">) *</span> <span class="hl num">2.0</span> <span class="hl opt">-</span> <span class="hl num">1.0</span><span class="hl opt">;</span>
		<span class="hl kwd">getSpecialTile</span><span class="hl opt">(</span><span class="hl num">0</span><span class="hl opt">, &amp;</span>tile<span class="hl opt">);</span>
		<span class="hl kwd">drawAutoLightedCuboid</span><span class="hl opt">(</span><span class="hl kwd">aabb3f</span><span class="hl opt">(-(</span>nb<span class="hl opt">[</span><span class="hl num">5</span><span class="hl opt">] ?</span> g <span class="hl opt">:</span> b<span class="hl opt">),</span>
		                             <span class="hl opt">-(</span>nb<span class="hl opt">[</span><span class="hl num">4</span><span class="hl opt">] ?</span> g <span class="hl opt">:</span> b<span class="hl opt">),</span>
		                             <span class="hl opt">-(</span>nb<span class="hl opt">[</span><span class="hl num">3</span><span class="hl opt">] ?</span> g <span class="hl opt">:</span> b<span class="hl opt">),</span>
		                              <span class="hl opt">(</span>nb<span class="hl opt">[</span><span class="hl num">2</span><span class="hl opt">] ?</span> g <span class="hl opt">:</span> b<span class="hl opt">),</span>
		                              <span class="hl opt">(</span>nb<span class="hl opt">[</span><span class="hl num">1</span><span class="hl opt">] ?</span> g <span class="hl opt">:</span> b<span class="hl opt">) *</span> vlev<span class="hl opt">,</span>
		                              <span class="hl opt">(</span>nb<span class="hl opt">[</span><span class="hl num">0</span><span class="hl opt">] ?</span> g <span class="hl opt">:</span> b<span class="hl opt">)));</span>
	<span class="hl opt">}</span>
<span class="hl opt">}</span>

<span class="hl kwb">void</span> <span class="hl kwc">MapblockMeshGenerator</span><span class="hl opt">::</span><span class="hl kwd">drawAllfacesNode</span><span class="hl opt">()</span>
<span class="hl opt">{</span>
	<span class="hl kwb">static const</span> aabb3f <span class="hl kwd">box</span><span class="hl opt">(-</span>BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">,</span> BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">,</span> BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">,</span> BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">);</span>
	<span class="hl kwd">useTile</span><span class="hl opt">(</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">);</span>
	<span class="hl kwd">drawAutoLightedCuboid</span><span class="hl opt">(</span>box<span class="hl opt">);</span>
<span class="hl opt">}</span>

<span class="hl kwb">void</span> <span class="hl kwc">MapblockMeshGenerator</span><span class="hl opt">::</span><span class="hl kwd">drawTorchlikeNode</span><span class="hl opt">()</span>
<span class="hl opt">{</span>
	u8 wall <span class="hl opt">=</span> n<span class="hl opt">.</span><span class="hl kwd">getWallMounted</span><span class="hl opt">(</span>nodedef<span class="hl opt">);</span>
	u8 tileindex <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span>
	<span class="hl kwa">switch</span> <span class="hl opt">(</span>wall<span class="hl opt">) {</span>
		<span class="hl kwa">case</span> DWM_YP<span class="hl opt">:</span> tileindex <span class="hl opt">=</span> <span class="hl num">1</span><span class="hl opt">;</span> <span class="hl kwa">break</span><span class="hl opt">;</span> <span class="hl slc">// ceiling</span>
		<span class="hl kwa">case</span> DWM_YN<span class="hl opt">:</span> tileindex <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> <span class="hl kwa">break</span><span class="hl opt">;</span> <span class="hl slc">// floor</span>
		<span class="hl kwa">default</span><span class="hl opt">:</span>     tileindex <span class="hl opt">=</span> <span class="hl num">2</span><span class="hl opt">;</span> <span class="hl slc">// side (or invalid—should we care?)</span>
	<span class="hl opt">}</span>
	<span class="hl kwd">useTile</span><span class="hl opt">(</span>tileindex<span class="hl opt">,</span> MATERIAL_FLAG_CRACK_OVERLAY<span class="hl opt">,</span> MATERIAL_FLAG_BACKFACE_CULLING<span class="hl opt">);</span>

	<span class="hl kwb">float</span> size <span class="hl opt">=</span> BS <span class="hl opt">/</span> <span class="hl num">2</span> <span class="hl opt">*</span> f<span class="hl opt">-&gt;</span>visual_scale<span class="hl opt">;</span>
	v3f vertices<span class="hl opt">[</span><span class="hl num">4</span><span class="hl opt">] = {</span>
		<span class="hl kwd">v3f</span><span class="hl opt">(-</span>size<span class="hl opt">,</span>  size<span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">),</span>
		<span class="hl kwd">v3f</span><span class="hl opt">(</span> size<span class="hl opt">,</span>  size<span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">),</span>
		<span class="hl kwd">v3f</span><span class="hl opt">(</span> size<span class="hl opt">, -</span>size<span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">),</span>
		<span class="hl kwd">v3f</span><span class="hl opt">(-</span>size<span class="hl opt">, -</span>size<span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">),</span>
	<span class="hl opt">};</span>
	<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> i <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> i <span class="hl opt">&lt;</span> <span class="hl num">4</span><span class="hl opt">;</span> i<span class="hl opt">++) {</span>
		<span class="hl kwa">switch</span> <span class="hl opt">(</span>wall<span class="hl opt">) {</span>
			<span class="hl kwa">case</span> DWM_YP<span class="hl opt">:</span> vertices<span class="hl opt">[</span>i<span class="hl opt">].</span><span class="hl kwd">rotateXZBy</span><span class="hl opt">(-</span><span class="hl num">45</span><span class="hl opt">);</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
			<span class="hl kwa">case</span> DWM_YN<span class="hl opt">:</span> vertices<span class="hl opt">[</span>i<span class="hl opt">].</span><span class="hl kwd">rotateXZBy</span><span class="hl opt">(</span> <span class="hl num">45</span><span class="hl opt">);</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
			<span class="hl kwa">case</span> DWM_XP<span class="hl opt">:</span> vertices<span class="hl opt">[</span>i<span class="hl opt">].</span><span class="hl kwd">rotateXZBy</span><span class="hl opt">(</span>  <span class="hl num">0</span><span class="hl opt">);</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
			<span class="hl kwa">case</span> DWM_XN<span class="hl opt">:</span> vertices<span class="hl opt">[</span>i<span class="hl opt">].</span><span class="hl kwd">rotateXZBy</span><span class="hl opt">(</span><span class="hl num">180</span><span class="hl opt">);</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
			<span class="hl kwa">case</span> DWM_ZP<span class="hl opt">:</span> vertices<span class="hl opt">[</span>i<span class="hl opt">].</span><span class="hl kwd">rotateXZBy</span><span class="hl opt">(</span> <span class="hl num">90</span><span class="hl opt">);</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
			<span class="hl kwa">case</span> DWM_ZN<span class="hl opt">:</span> vertices<span class="hl opt">[</span>i<span class="hl opt">].</span><span class="hl kwd">rotateXZBy</span><span class="hl opt">(-</span><span class="hl num">90</span><span class="hl opt">);</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
		<span class="hl opt">}</span>
	<span class="hl opt">}</span>
	<span class="hl kwd">drawQuad</span><span class="hl opt">(</span>vertices<span class="hl opt">);</span>
<span class="hl opt">}</span>

<span class="hl kwb">void</span> <span class="hl kwc">MapblockMeshGenerator</span><span class="hl opt">::</span><span class="hl kwd">drawSignlikeNode</span><span class="hl opt">()</span>
<span class="hl opt">{</span>
	u8 wall <span class="hl opt">=</span> n<span class="hl opt">.</span><span class="hl kwd">getWallMounted</span><span class="hl opt">(</span>nodedef<span class="hl opt">);</span>
	<span class="hl kwd">useTile</span><span class="hl opt">(</span><span class="hl num">0</span><span class="hl opt">,</span> MATERIAL_FLAG_CRACK_OVERLAY<span class="hl opt">,</span> MATERIAL_FLAG_BACKFACE_CULLING<span class="hl opt">);</span>
	<span class="hl kwb">static const float</span> offset <span class="hl opt">=</span> BS <span class="hl opt">/</span> <span class="hl num">16</span><span class="hl opt">;</span>
	<span class="hl kwb">float</span> size <span class="hl opt">=</span> BS <span class="hl opt">/</span> <span class="hl num">2</span> <span class="hl opt">*</span> f<span class="hl opt">-&gt;</span>visual_scale<span class="hl opt">;</span>
	<span class="hl slc">// Wall at X+ of node</span>
	v3f vertices<span class="hl opt">[</span><span class="hl num">4</span><span class="hl opt">] = {</span>
		<span class="hl kwd">v3f</span><span class="hl opt">(</span>BS <span class="hl opt">/</span> <span class="hl num">2</span> <span class="hl opt">-</span> offset<span class="hl opt">,</span>  size<span class="hl opt">,</span>  size<span class="hl opt">),</span>
		<span class="hl kwd">v3f</span><span class="hl opt">(</span>BS <span class="hl opt">/</span> <span class="hl num">2</span> <span class="hl opt">-</span> offset<span class="hl opt">,</span>  size<span class="hl opt">, -</span>size<span class="hl opt">),</span>
		<span class="hl kwd">v3f</span><span class="hl opt">(</span>BS <span class="hl opt">/</span> <span class="hl num">2</span> <span class="hl opt">-</span> offset<span class="hl opt">, -</span>size<span class="hl opt">, -</span>size<span class="hl opt">),</span>
		<span class="hl kwd">v3f</span><span class="hl opt">(</span>BS <span class="hl opt">/</span> <span class="hl num">2</span> <span class="hl opt">-</span> offset<span class="hl opt">, -</span>size<span class="hl opt">,</span>  size<span class="hl opt">),</span>
	<span class="hl opt">};</span>
	<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> i <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> i <span class="hl opt">&lt;</span> <span class="hl num">4</span><span class="hl opt">;</span> i<span class="hl opt">++) {</span>
		<span class="hl kwa">switch</span> <span class="hl opt">(</span>wall<span class="hl opt">) {</span>
			<span class="hl kwa">case</span> DWM_YP<span class="hl opt">:</span> vertices<span class="hl opt">[</span>i<span class="hl opt">].</span><span class="hl kwd">rotateXYBy</span><span class="hl opt">(</span> <span class="hl num">90</span><span class="hl opt">);</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
			<span class="hl kwa">case</span> DWM_YN<span class="hl opt">:</span> vertices<span class="hl opt">[</span>i<span class="hl opt">].</span><span class="hl kwd">rotateXYBy</span><span class="hl opt">(-</span><span class="hl num">90</span><span class="hl opt">);</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
			<span class="hl kwa">case</span> DWM_XP<span class="hl opt">:</span> vertices<span class="hl opt">[</span>i<span class="hl opt">].</span><span class="hl kwd">rotateXZBy</span><span class="hl opt">(</span>  <span class="hl num">0</span><span class="hl opt">);</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
			<span class="hl kwa">case</span> DWM_XN<span class="hl opt">:</span> vertices<span class="hl opt">[</span>i<span class="hl opt">].</span><span class="hl kwd">rotateXZBy</span><span class="hl opt">(</span><span class="hl num">180</span><span class="hl opt">);</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
			<span class="hl kwa">case</span> DWM_ZP<span class="hl opt">:</span> vertices<span class="hl opt">[</span>i<span class="hl opt">].</span><span class="hl kwd">rotateXZBy</span><span class="hl opt">(</span> <span class="hl num">90</span><span class="hl opt">);</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
			<span class="hl kwa">case</span> DWM_ZN<span class="hl opt">:</span> vertices<span class="hl opt">[</span>i<span class="hl opt">].</span><span class="hl kwd">rotateXZBy</span><span class="hl opt">(-</span><span class="hl num">90</span><span class="hl opt">);</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
		<span class="hl opt">}</span>
	<span class="hl opt">}</span>
	<span class="hl kwd">drawQuad</span><span class="hl opt">(</span>vertices<span class="hl opt">);</span>
<span class="hl opt">}</span>

<span class="hl kwb">void</span> <span class="hl kwc">MapblockMeshGenerator</span><span class="hl opt">::</span><span class="hl kwd">drawPlantlikeQuad</span><span class="hl opt">(</span><span class="hl kwb">float</span> rotation<span class="hl opt">,</span> <span class="hl kwb">float</span> quad_offset<span class="hl opt">,</span>
	<span class="hl kwb">bool</span> offset_top_only<span class="hl opt">)</span>
<span class="hl opt">{</span>
	v3f vertices<span class="hl opt">[</span><span class="hl num">4</span><span class="hl opt">] = {</span>
		<span class="hl kwd">v3f</span><span class="hl opt">(-</span>scale<span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">2</span> <span class="hl opt">+</span> <span class="hl num">2.0</span> <span class="hl opt">*</span> scale <span class="hl opt">*</span> plant_height<span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">),</span>
		<span class="hl kwd">v3f</span><span class="hl opt">(</span> scale<span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">2</span> <span class="hl opt">+</span> <span class="hl num">2.0</span> <span class="hl opt">*</span> scale <span class="hl opt">*</span> plant_height<span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">),</span>
		<span class="hl kwd">v3f</span><span class="hl opt">(</span> scale<span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">),</span>
		<span class="hl kwd">v3f</span><span class="hl opt">(-</span>scale<span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">),</span>
	<span class="hl opt">};</span>
	<span class="hl kwa">if</span> <span class="hl opt">(</span>random_offset_Y<span class="hl opt">) {</span>
		PseudoRandom <span class="hl kwd">yrng</span><span class="hl opt">(</span>face_num<span class="hl opt">++ |</span> p<span class="hl opt">.</span>X <span class="hl opt">&lt;&lt;</span> <span class="hl num">16</span> <span class="hl opt">|</span> p<span class="hl opt">.</span>Z <span class="hl opt">&lt;&lt;</span> <span class="hl num">8</span> <span class="hl opt">|</span> p<span class="hl opt">.</span>Y <span class="hl opt">&lt;&lt;</span> <span class="hl num">24</span><span class="hl opt">);</span>
		offset<span class="hl opt">.</span>Y <span class="hl opt">= -</span>BS <span class="hl opt">* ((</span>yrng<span class="hl opt">.</span><span class="hl kwd">next</span><span class="hl opt">() %</span> <span class="hl num">16</span> <span class="hl opt">/</span> <span class="hl num">16.0</span><span class="hl opt">) *</span> <span class="hl num">0.125</span><span class="hl opt">);</span>
	<span class="hl opt">}</span>
	<span class="hl kwb">int</span> offset_count <span class="hl opt">=</span> offset_top_only <span class="hl opt">?</span> <span class="hl num">2</span> <span class="hl opt">:</span> <span class="hl num">4</span><span class="hl opt">;</span>
	<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> i <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> i <span class="hl opt">&lt;</span> offset_count<span class="hl opt">;</span> i<span class="hl opt">++)</span>
		vertices<span class="hl opt">[</span>i<span class="hl opt">].</span>Z <span class="hl opt">+=</span> quad_offset<span class="hl opt">;</span>
	<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> i <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> i <span class="hl opt">&lt;</span> <span class="hl num">4</span><span class="hl opt">;</span> i<span class="hl opt">++) {</span>
		vertices<span class="hl opt">[</span>i<span class="hl opt">].</span><span class="hl kwd">rotateXZBy</span><span class="hl opt">(</span>rotation <span class="hl opt">+</span> rotate_degree<span class="hl opt">);</span>
		vertices<span class="hl opt">[</span>i<span class="hl opt">] +=</span> offset<span class="hl opt">;</span>
	<span class="hl opt">}</span>
	<span class="hl kwd">drawQuad</span><span class="hl opt">(</span>vertices<span class="hl opt">,</span> <span class="hl kwd">v3s16</span><span class="hl opt">(</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">),</span> plant_height<span class="hl opt">);</span>
<span class="hl opt">}</span>

<span class="hl kwb">void</span> <span class="hl kwc">MapblockMeshGenerator</span><span class="hl opt">::</span><span class="hl kwd">drawPlantlike</span><span class="hl opt">()</span>
<span class="hl opt">{</span>
	draw_style <span class="hl opt">=</span> PLANT_STYLE_CROSS<span class="hl opt">;</span>
	scale <span class="hl opt">=</span> BS <span class="hl opt">/</span> <span class="hl num">2</span> <span class="hl opt">*</span> f<span class="hl opt">-&gt;</span>visual_scale<span class="hl opt">;</span>
	offset <span class="hl opt">=</span> <span class="hl kwd">v3f</span><span class="hl opt">(</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">);</span>
	rotate_degree <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span>
	random_offset_Y <span class="hl opt">=</span> <span class="hl kwa">false</span><span class="hl opt">;</span>
	face_num <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span>
	plant_height <span class="hl opt">=</span> <span class="hl num">1.0</span><span class="hl opt">;</span>

	<span class="hl kwa">switch</span> <span class="hl opt">(</span>f<span class="hl opt">-&gt;</span>param_type_2<span class="hl opt">) {</span>
	<span class="hl kwa">case</span> CPT2_MESHOPTIONS<span class="hl opt">:</span>
		draw_style <span class="hl opt">=</span> <span class="hl kwd">PlantlikeStyle</span><span class="hl opt">(</span>n<span class="hl opt">.</span>param2 <span class="hl opt">&amp;</span> MO_MASK_STYLE<span class="hl opt">);</span>
		<span class="hl kwa">if</span> <span class="hl opt">(</span>n<span class="hl opt">.</span>param2 <span class="hl opt">&amp;</span> MO_BIT_SCALE_SQRT2<span class="hl opt">)</span>
			scale <span class="hl opt">*=</span> <span class="hl num">1.41421</span><span class="hl opt">;</span>
		<span class="hl kwa">if</span> <span class="hl opt">(</span>n<span class="hl opt">.</span>param2 <span class="hl opt">&amp;</span> MO_BIT_RANDOM_OFFSET<span class="hl opt">) {</span>
			PseudoRandom <span class="hl kwd">rng</span><span class="hl opt">(</span>p<span class="hl opt">.</span>X <span class="hl opt">&lt;&lt;</span> <span class="hl num">8</span> <span class="hl opt">|</span> p<span class="hl opt">.</span>Z <span class="hl opt">|</span> p<span class="hl opt">.</span>Y <span class="hl opt">&lt;&lt;</span> <span class="hl num">16</span><span class="hl opt">);</span>
			offset<span class="hl opt">.</span>X <span class="hl opt">=</span> BS <span class="hl opt">* ((</span>rng<span class="hl opt">.</span><span class="hl kwd">next</span><span class="hl opt">() %</span> <span class="hl num">16</span> <span class="hl opt">/</span> <span class="hl num">16.0</span><span class="hl opt">) *</span> <span class="hl num">0.29</span> <span class="hl opt">-</span> <span class="hl num">0.145</span><span class="hl opt">);</span>
			offset<span class="hl opt">.</span>Z <span class="hl opt">=</span> BS <span class="hl opt">* ((</span>rng<span class="hl opt">.</span><span class="hl kwd">next</span><span class="hl opt">() %</span> <span class="hl num">16</span> <span class="hl opt">/</span> <span class="hl num">16.0</span><span class="hl opt">) *</span> <span class="hl num">0.29</span> <span class="hl opt">-</span> <span class="hl num">0.145</span><span class="hl opt">);</span>
		<span class="hl opt">}</span>
		<span class="hl kwa">if</span> <span class="hl opt">(</span>n<span class="hl opt">.</span>param2 <span class="hl opt">&amp;</span> MO_BIT_RANDOM_OFFSET_Y<span class="hl opt">)</span>
			random_offset_Y <span class="hl opt">=</span> <span class="hl kwa">true</span><span class="hl opt">;</span>
		<span class="hl kwa">break</span><span class="hl opt">;</span>

	<span class="hl kwa">case</span> CPT2_DEGROTATE<span class="hl opt">:</span>
		rotate_degree <span class="hl opt">=</span> n<span class="hl opt">.</span>param2 <span class="hl opt">*</span> <span class="hl num">2</span><span class="hl opt">;</span>
		<span class="hl kwa">break</span><span class="hl opt">;</span>

	<span class="hl kwa">case</span> CPT2_LEVELED<span class="hl opt">:</span>
		plant_height <span class="hl opt">=</span> n<span class="hl opt">.</span>param2 <span class="hl opt">/</span> <span class="hl num">16.0</span><span class="hl opt">;</span>
		<span class="hl kwa">break</span><span class="hl opt">;</span>

	<span class="hl kwa">default</span><span class="hl opt">:</span>
		<span class="hl kwa">break</span><span class="hl opt">;</span>
	<span class="hl opt">}</span>

	<span class="hl kwa">switch</span> <span class="hl opt">(</span>draw_style<span class="hl opt">) {</span>
	<span class="hl kwa">case</span> PLANT_STYLE_CROSS<span class="hl opt">:</span>
		<span class="hl kwd">drawPlantlikeQuad</span><span class="hl opt">(</span><span class="hl num">46</span><span class="hl opt">);</span>
		<span class="hl kwd">drawPlantlikeQuad</span><span class="hl opt">(-</span><span class="hl num">44</span><span class="hl opt">);</span>
		<span class="hl kwa">break</span><span class="hl opt">;</span>

	<span class="hl kwa">case</span> PLANT_STYLE_CROSS2<span class="hl opt">:</span>
		<span class="hl kwd">drawPlantlikeQuad</span><span class="hl opt">(</span><span class="hl num">91</span><span class="hl opt">);</span>
		<span class="hl kwd">drawPlantlikeQuad</span><span class="hl opt">(</span><span class="hl num">1</span><span class="hl opt">);</span>
		<span class="hl kwa">break</span><span class="hl opt">;</span>

	<span class="hl kwa">case</span> PLANT_STYLE_STAR<span class="hl opt">:</span>
		<span class="hl kwd">drawPlantlikeQuad</span><span class="hl opt">(</span><span class="hl num">121</span><span class="hl opt">);</span>
		<span class="hl kwd">drawPlantlikeQuad</span><span class="hl opt">(</span><span class="hl num">241</span><span class="hl opt">);</span>
		<span class="hl kwd">drawPlantlikeQuad</span><span class="hl opt">(</span><span class="hl num">1</span><span class="hl opt">);</span>
		<span class="hl kwa">break</span><span class="hl opt">;</span>

	<span class="hl kwa">case</span> PLANT_STYLE_HASH<span class="hl opt">:</span>
		<span class="hl kwd">drawPlantlikeQuad</span><span class="hl opt">(</span>  <span class="hl num">1</span><span class="hl opt">,</span> BS <span class="hl opt">/</span> <span class="hl num">4</span><span class="hl opt">);</span>
		<span class="hl kwd">drawPlantlikeQuad</span><span class="hl opt">(</span> <span class="hl num">91</span><span class="hl opt">,</span> BS <span class="hl opt">/</span> <span class="hl num">4</span><span class="hl opt">);</span>
		<span class="hl kwd">drawPlantlikeQuad</span><span class="hl opt">(</span><span class="hl num">181</span><span class="hl opt">,</span> BS <span class="hl opt">/</span> <span class="hl num">4</span><span class="hl opt">);</span>
		<span class="hl kwd">drawPlantlikeQuad</span><span class="hl opt">(</span><span class="hl num">271</span><span class="hl opt">,</span> BS <span class="hl opt">/</span> <span class="hl num">4</span><span class="hl opt">);</span>
		<span class="hl kwa">break</span><span class="hl opt">;</span>

	<span class="hl kwa">case</span> PLANT_STYLE_HASH2<span class="hl opt">:</span>
		<span class="hl kwd">drawPlantlikeQuad</span><span class="hl opt">(</span>  <span class="hl num">1</span><span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">,</span> <span class="hl kwa">true</span><span class="hl opt">);</span>
		<span class="hl kwd">drawPlantlikeQuad</span><span class="hl opt">(</span> <span class="hl num">91</span><span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">,</span> <span class="hl kwa">true</span><span class="hl opt">);</span>
		<span class="hl kwd">drawPlantlikeQuad</span><span class="hl opt">(</span><span class="hl num">181</span><span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">,</span> <span class="hl kwa">true</span><span class="hl opt">);</span>
		<span class="hl kwd">drawPlantlikeQuad</span><span class="hl opt">(</span><span class="hl num">271</span><span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">,</span> <span class="hl kwa">true</span><span class="hl opt">);</span>
		<span class="hl kwa">break</span><span class="hl opt">;</span>
	<span class="hl opt">}</span>
<span class="hl opt">}</span>

<span class="hl kwb">void</span> <span class="hl kwc">MapblockMeshGenerator</span><span class="hl opt">::</span><span class="hl kwd">drawPlantlikeNode</span><span class="hl opt">()</span>
<span class="hl opt">{</span>
	<span class="hl kwd">useTile</span><span class="hl opt">();</span>
	<span class="hl kwd">drawPlantlike</span><span class="hl opt">();</span>
<span class="hl opt">}</span>

<span class="hl kwb">void</span> <span class="hl kwc">MapblockMeshGenerator</span><span class="hl opt">::</span><span class="hl kwd">drawPlantlikeRootedNode</span><span class="hl opt">()</span>
<span class="hl opt">{</span>
	<span class="hl kwd">useTile</span><span class="hl opt">(</span><span class="hl num">0</span><span class="hl opt">,</span> MATERIAL_FLAG_CRACK_OVERLAY<span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl kwa">true</span><span class="hl opt">);</span>
	origin <span class="hl opt">+=</span> <span class="hl kwd">v3f</span><span class="hl opt">(</span><span class="hl num">0.0</span><span class="hl opt">,</span> BS<span class="hl opt">,</span> <span class="hl num">0.0</span><span class="hl opt">);</span>
	p<span class="hl opt">.</span>Y<span class="hl opt">++;</span>
	<span class="hl kwa">if</span> <span class="hl opt">(</span>data<span class="hl opt">-&gt;</span>m_smooth_lighting<span class="hl opt">) {</span>
		<span class="hl kwd">getSmoothLightFrame</span><span class="hl opt">();</span>
	<span class="hl opt">}</span> <span class="hl kwa">else</span> <span class="hl opt">{</span>
		MapNode ntop <span class="hl opt">=</span> data<span class="hl opt">-&gt;</span>m_vmanip<span class="hl opt">.</span><span class="hl kwd">getNodeNoEx</span><span class="hl opt">(</span>blockpos_nodes <span class="hl opt">+</span> p<span class="hl opt">);</span>
		light <span class="hl opt">=</span> <span class="hl kwd">getInteriorLight</span><span class="hl opt">(</span>ntop<span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">,</span> nodedef<span class="hl opt">);</span>
	<span class="hl opt">}</span>
	<span class="hl kwd">drawPlantlike</span><span class="hl opt">();</span>
	p<span class="hl opt">.</span>Y<span class="hl opt">--;</span>
<span class="hl opt">}</span>

<span class="hl kwb">void</span> <span class="hl kwc">MapblockMeshGenerator</span><span class="hl opt">::</span><span class="hl kwd">drawFirelikeQuad</span><span class="hl opt">(</span><span class="hl kwb">float</span> rotation<span class="hl opt">,</span> <span class="hl kwb">float</span> opening_angle<span class="hl opt">,</span>
	<span class="hl kwb">float</span> offset_h<span class="hl opt">,</span> <span class="hl kwb">float</span> offset_v<span class="hl opt">)</span>
<span class="hl opt">{</span>
	v3f vertices<span class="hl opt">[</span><span class="hl num">4</span><span class="hl opt">] = {</span>
		<span class="hl kwd">v3f</span><span class="hl opt">(-</span>scale<span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">2</span> <span class="hl opt">+</span> scale <span class="hl opt">*</span> <span class="hl num">2</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">),</span>
		<span class="hl kwd">v3f</span><span class="hl opt">(</span> scale<span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">2</span> <span class="hl opt">+</span> scale <span class="hl opt">*</span> <span class="hl num">2</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">),</span>
		<span class="hl kwd">v3f</span><span class="hl opt">(</span> scale<span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">),</span>
		<span class="hl kwd">v3f</span><span class="hl opt">(-</span>scale<span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">),</span>
	<span class="hl opt">};</span>
	<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> i <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> i <span class="hl opt">&lt;</span> <span class="hl num">4</span><span class="hl opt">;</span> i<span class="hl opt">++) {</span>
		vertices<span class="hl opt">[</span>i<span class="hl opt">].</span><span class="hl kwd">rotateYZBy</span><span class="hl opt">(</span>opening_angle<span class="hl opt">);</span>
		vertices<span class="hl opt">[</span>i<span class="hl opt">].</span>Z <span class="hl opt">+=</span> offset_h<span class="hl opt">;</span>
		vertices<span class="hl opt">[</span>i<span class="hl opt">].</span><span class="hl kwd">rotateXZBy</span><span class="hl opt">(</span>rotation<span class="hl opt">);</span>
		vertices<span class="hl opt">[</span>i<span class="hl opt">].</span>Y <span class="hl opt">+=</span> offset_v<span class="hl opt">;</span>
	<span class="hl opt">}</span>
	<span class="hl kwd">drawQuad</span><span class="hl opt">(</span>vertices<span class="hl opt">);</span>
<span class="hl opt">}</span>

<span class="hl kwb">void</span> <span class="hl kwc">MapblockMeshGenerator</span><span class="hl opt">::</span><span class="hl kwd">drawFirelikeNode</span><span class="hl opt">()</span>
<span class="hl opt">{</span>
	<span class="hl kwd">useTile</span><span class="hl opt">();</span>
	scale <span class="hl opt">=</span> BS <span class="hl opt">/</span> <span class="hl num">2</span> <span class="hl opt">*</span> f<span class="hl opt">-&gt;</span>visual_scale<span class="hl opt">;</span>

	<span class="hl slc">// Check for adjacent nodes</span>
	<span class="hl kwb">bool</span> neighbors <span class="hl opt">=</span> <span class="hl kwa">false</span><span class="hl opt">;</span>
	<span class="hl kwb">bool</span> neighbor<span class="hl opt">[</span><span class="hl num">6</span><span class="hl opt">] = {</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">};</span>
	content_t current <span class="hl opt">=</span> n<span class="hl opt">.</span><span class="hl kwd">getContent</span><span class="hl opt">();</span>
	<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> i <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> i <span class="hl opt">&lt;</span> <span class="hl num">6</span><span class="hl opt">;</span> i<span class="hl opt">++) {</span>
		v3s16 n2p <span class="hl opt">=</span> blockpos_nodes <span class="hl opt">+</span> p <span class="hl opt">+</span> g_6dirs<span class="hl opt">[</span>i<span class="hl opt">];</span>
		MapNode n2 <span class="hl opt">=</span> data<span class="hl opt">-&gt;</span>m_vmanip<span class="hl opt">.</span><span class="hl kwd">getNodeNoEx</span><span class="hl opt">(</span>n2p<span class="hl opt">);</span>
		content_t n2c <span class="hl opt">=</span> n2<span class="hl opt">.</span><span class="hl kwd">getContent</span><span class="hl opt">();</span>
		<span class="hl kwa">if</span> <span class="hl opt">(</span>n2c <span class="hl opt">!=</span> CONTENT_IGNORE <span class="hl opt">&amp;&amp;</span> n2c <span class="hl opt">!=</span> CONTENT_AIR <span class="hl opt">&amp;&amp;</span> n2c <span class="hl opt">!=</span> current<span class="hl opt">) {</span>
			neighbor<span class="hl opt">[</span>i<span class="hl opt">] =</span> <span class="hl kwa">true</span><span class="hl opt">;</span>
			neighbors <span class="hl opt">=</span> <span class="hl kwa">true</span><span class="hl opt">;</span>
		<span class="hl opt">}</span>
	<span class="hl opt">}</span>
	<span class="hl kwb">bool</span> drawBasicFire <span class="hl opt">=</span> neighbor<span class="hl opt">[</span>D6D_YN<span class="hl opt">] || !</span>neighbors<span class="hl opt">;</span>
	<span class="hl kwb">bool</span> drawBottomFire <span class="hl opt">=</span> neighbor<span class="hl opt">[</span>D6D_YP<span class="hl opt">];</span>

	<span class="hl kwa">if</span> <span class="hl opt">(</span>drawBasicFire <span class="hl opt">||</span> neighbor<span class="hl opt">[</span>D6D_ZP<span class="hl opt">])</span>
		<span class="hl kwd">drawFirelikeQuad</span><span class="hl opt">(</span><span class="hl num">0</span><span class="hl opt">, -</span><span class="hl num">10</span><span class="hl opt">,</span> <span class="hl num">0.4</span> <span class="hl opt">*</span> BS<span class="hl opt">);</span>
	<span class="hl kwa">else if</span> <span class="hl opt">(</span>drawBottomFire<span class="hl opt">)</span>
		<span class="hl kwd">drawFirelikeQuad</span><span class="hl opt">(</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">70</span><span class="hl opt">,</span> <span class="hl num">0.47</span> <span class="hl opt">*</span> BS<span class="hl opt">,</span> <span class="hl num">0.484</span> <span class="hl opt">*</span> BS<span class="hl opt">);</span>

	<span class="hl kwa">if</span> <span class="hl opt">(</span>drawBasicFire <span class="hl opt">||</span> neighbor<span class="hl opt">[</span>D6D_XN<span class="hl opt">])</span>
		<span class="hl kwd">drawFirelikeQuad</span><span class="hl opt">(</span><span class="hl num">90</span><span class="hl opt">, -</span><span class="hl num">10</span><span class="hl opt">,</span> <span class="hl num">0.4</span> <span class="hl opt">*</span> BS<span class="hl opt">);</span>
	<span class="hl kwa">else if</span> <span class="hl opt">(</span>drawBottomFire<span class="hl opt">)</span>
		<span class="hl kwd">drawFirelikeQuad</span><span class="hl opt">(</span><span class="hl num">90</span><span class="hl opt">,</span> <span class="hl num">70</span><span class="hl opt">,</span> <span class="hl num">0.47</span> <span class="hl opt">*</span> BS<span class="hl opt">,</span> <span class="hl num">0.484</span> <span class="hl opt">*</span> BS<span class="hl opt">);</span>

	<span class="hl kwa">if</span> <span class="hl opt">(</span>drawBasicFire <span class="hl opt">||</span> neighbor<span class="hl opt">[</span>D6D_ZN<span class="hl opt">])</span>
		<span class="hl kwd">drawFirelikeQuad</span><span class="hl opt">(</span><span class="hl num">180</span><span class="hl opt">, -</span><span class="hl num">10</span><span class="hl opt">,</span> <span class="hl num">0.4</span> <span class="hl opt">*</span> BS<span class="hl opt">);</span>
	<span class="hl kwa">else if</span> <span class="hl opt">(</span>drawBottomFire<span class="hl opt">)</span>
		<span class="hl kwd">drawFirelikeQuad</span><span class="hl opt">(</span><span class="hl num">180</span><span class="hl opt">,</span> <span class="hl num">70</span><span class="hl opt">,</span> <span class="hl num">0.47</span> <span class="hl opt">*</span> BS<span class="hl opt">,</span> <span class="hl num">0.484</span> <span class="hl opt">*</span> BS<span class="hl opt">);</span>

	<span class="hl kwa">if</span> <span class="hl opt">(</span>drawBasicFire <span class="hl opt">||</span> neighbor<span class="hl opt">[</span>D6D_XP<span class="hl opt">])</span>
		<span class="hl kwd">drawFirelikeQuad</span><span class="hl opt">(</span><span class="hl num">270</span><span class="hl opt">, -</span><span class="hl num">10</span><span class="hl opt">,</span> <span class="hl num">0.4</span> <span class="hl opt">*</span> BS<span class="hl opt">);</span>
	<span class="hl kwa">else if</span> <span class="hl opt">(</span>drawBottomFire<span class="hl opt">)</span>
		<span class="hl kwd">drawFirelikeQuad</span><span class="hl opt">(</span><span class="hl num">270</span><span class="hl opt">,</span> <span class="hl num">70</span><span class="hl opt">,</span> <span class="hl num">0.47</span> <span class="hl opt">*</span> BS<span class="hl opt">,</span> <span class="hl num">0.484</span> <span class="hl opt">*</span> BS<span class="hl opt">);</span>

	<span class="hl kwa">if</span> <span class="hl opt">(</span>drawBasicFire<span class="hl opt">) {</span>
		<span class="hl kwd">drawFirelikeQuad</span><span class="hl opt">(</span><span class="hl num">45</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0.0</span><span class="hl opt">);</span>
		<span class="hl kwd">drawFirelikeQuad</span><span class="hl opt">(-</span><span class="hl num">45</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0.0</span><span class="hl opt">);</span>
	<span class="hl opt">}</span>
<span class="hl opt">}</span>

<span class="hl kwb">void</span> <span class="hl kwc">MapblockMeshGenerator</span><span class="hl opt">::</span><span class="hl kwd">drawFencelikeNode</span><span class="hl opt">()</span>
<span class="hl opt">{</span>
	<span class="hl kwd">useTile</span><span class="hl opt">(</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">);</span>
	TileSpec tile_nocrack <span class="hl opt">=</span> tile<span class="hl opt">;</span>
	<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> layer <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> layer <span class="hl opt">&lt;</span> MAX_TILE_LAYERS<span class="hl opt">;</span> layer<span class="hl opt">++)</span>
		tile_nocrack<span class="hl opt">.</span>layers<span class="hl opt">[</span>layer<span class="hl opt">].</span>material_flags <span class="hl opt">&amp;= ~</span>MATERIAL_FLAG_CRACK<span class="hl opt">;</span>

	<span class="hl slc">// Put wood the right way around in the posts</span>
	TileSpec tile_rot <span class="hl opt">=</span> tile<span class="hl opt">;</span>
	tile_rot<span class="hl opt">.</span>rotation <span class="hl opt">=</span> <span class="hl num">1</span><span class="hl opt">;</span>

	<span class="hl kwb">static const</span> f32 post_rad <span class="hl opt">=</span> BS <span class="hl opt">/</span> <span class="hl num">8</span><span class="hl opt">;</span>
	<span class="hl kwb">static const</span> f32 bar_rad  <span class="hl opt">=</span> BS <span class="hl opt">/</span> <span class="hl num">16</span><span class="hl opt">;</span>
	<span class="hl kwb">static const</span> f32 bar_len  <span class="hl opt">=</span> BS <span class="hl opt">/</span> <span class="hl num">2</span> <span class="hl opt">-</span> post_rad<span class="hl opt">;</span>

	<span class="hl slc">// The post - always present</span>
	<span class="hl kwb">static const</span> aabb3f <span class="hl kwd">post</span><span class="hl opt">(-</span>post_rad<span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">, -</span>post_rad<span class="hl opt">,</span>
	                          post_rad<span class="hl opt">,</span>  BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">,</span>  post_rad<span class="hl opt">);</span>
	<span class="hl kwb">static const</span> f32 postuv<span class="hl opt">[</span><span class="hl num">24</span><span class="hl opt">] = {</span>
		<span class="hl num">0.375</span><span class="hl opt">,</span> <span class="hl num">0.375</span><span class="hl opt">,</span> <span class="hl num">0.625</span><span class="hl opt">,</span> <span class="hl num">0.625</span><span class="hl opt">,</span>
		<span class="hl num">0.375</span><span class="hl opt">,</span> <span class="hl num">0.375</span><span class="hl opt">,</span> <span class="hl num">0.625</span><span class="hl opt">,</span> <span class="hl num">0.625</span><span class="hl opt">,</span>
		<span class="hl num">0.000</span><span class="hl opt">,</span> <span class="hl num">0.000</span><span class="hl opt">,</span> <span class="hl num">0.250</span><span class="hl opt">,</span> <span class="hl num">1.000</span><span class="hl opt">,</span>
		<span class="hl num">0.250</span><span class="hl opt">,</span> <span class="hl num">0.000</span><span class="hl opt">,</span> <span class="hl num">0.500</span><span class="hl opt">,</span> <span class="hl num">1.000</span><span class="hl opt">,</span>
		<span class="hl num">0.500</span><span class="hl opt">,</span> <span class="hl num">0.000</span><span class="hl opt">,</span> <span class="hl num">0.750</span><span class="hl opt">,</span> <span class="hl num">1.000</span><span class="hl opt">,</span>
		<span class="hl num">0.750</span><span class="hl opt">,</span> <span class="hl num">0.000</span><span class="hl opt">,</span> <span class="hl num">1.000</span><span class="hl opt">,</span> <span class="hl num">1.000</span><span class="hl opt">,</span>
	<span class="hl opt">};</span>
	tile <span class="hl opt">=</span> tile_rot<span class="hl opt">;</span>
	<span class="hl kwd">drawAutoLightedCuboid</span><span class="hl opt">(</span>post<span class="hl opt">,</span> postuv<span class="hl opt">);</span>

	tile <span class="hl opt">=</span> tile_nocrack<span class="hl opt">;</span>

	<span class="hl slc">// Now a section of fence, +X, if there&apos;s a post there</span>
	v3s16 p2 <span class="hl opt">=</span> p<span class="hl opt">;</span>
	p2<span class="hl opt">.</span>X<span class="hl opt">++;</span>
	MapNode n2 <span class="hl opt">=</span> data<span class="hl opt">-&gt;</span>m_vmanip<span class="hl opt">.</span><span class="hl kwd">getNodeNoEx</span><span class="hl opt">(</span>blockpos_nodes <span class="hl opt">+</span> p2<span class="hl opt">);</span>
	<span class="hl kwb">const</span> ContentFeatures <span class="hl opt">*</span>f2 <span class="hl opt">= &amp;</span>nodedef<span class="hl opt">-&gt;</span><span class="hl kwd">get</span><span class="hl opt">(</span>n2<span class="hl opt">);</span>
	<span class="hl kwa">if</span> <span class="hl opt">(</span>f2<span class="hl opt">-&gt;</span>drawtype <span class="hl opt">==</span> NDT_FENCELIKE<span class="hl opt">) {</span>
		<span class="hl kwb">static const</span> aabb3f <span class="hl kwd">bar_x1</span><span class="hl opt">(</span>BS <span class="hl opt">/</span> <span class="hl num">2</span> <span class="hl opt">-</span> bar_len<span class="hl opt">,</span>  BS <span class="hl opt">/</span> <span class="hl num">4</span> <span class="hl opt">-</span> bar_rad<span class="hl opt">, -</span>bar_rad<span class="hl opt">,</span>
		                           BS <span class="hl opt">/</span> <span class="hl num">2</span> <span class="hl opt">+</span> bar_len<span class="hl opt">,</span>  BS <span class="hl opt">/</span> <span class="hl num">4</span> <span class="hl opt">+</span> bar_rad<span class="hl opt">,</span>  bar_rad<span class="hl opt">);</span>
		<span class="hl kwb">static const</span> aabb3f <span class="hl kwd">bar_x2</span><span class="hl opt">(</span>BS <span class="hl opt">/</span> <span class="hl num">2</span> <span class="hl opt">-</span> bar_len<span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">4</span> <span class="hl opt">-</span> bar_rad<span class="hl opt">, -</span>bar_rad<span class="hl opt">,</span>
		                           BS <span class="hl opt">/</span> <span class="hl num">2</span> <span class="hl opt">+</span> bar_len<span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">4</span> <span class="hl opt">+</span> bar_rad<span class="hl opt">,</span>  bar_rad<span class="hl opt">);</span>
		<span class="hl kwb">static const</span> f32 xrailuv<span class="hl opt">[</span><span class="hl num">24</span><span class="hl opt">] = {</span>
			<span class="hl num">0.000</span><span class="hl opt">,</span> <span class="hl num">0.125</span><span class="hl opt">,</span> <span class="hl num">1.000</span><span class="hl opt">,</span> <span class="hl num">0.250</span><span class="hl opt">,</span>
			<span class="hl num">0.000</span><span class="hl opt">,</span> <span class="hl num">0.250</span><span class="hl opt">,</span> <span class="hl num">1.000</span><span class="hl opt">,</span> <span class="hl num">0.375</span><span class="hl opt">,</span>
			<span class="hl num">0.375</span><span class="hl opt">,</span> <span class="hl num">0.375</span><span class="hl opt">,</span> <span class="hl num">0.500</span><span class="hl opt">,</span> <span class="hl num">0.500</span><span class="hl opt">,</span>
			<span class="hl num">0.625</span><span class="hl opt">,</span> <span class="hl num">0.625</span><span class="hl opt">,</span> <span class="hl num">0.750</span><span class="hl opt">,</span> <span class="hl num">0.750</span><span class="hl opt">,</span>
			<span class="hl num">0.000</span><span class="hl opt">,</span> <span class="hl num">0.500</span><span class="hl opt">,</span> <span class="hl num">1.000</span><span class="hl opt">,</span> <span class="hl num">0.625</span><span class="hl opt">,</span>
			<span class="hl num">0.000</span><span class="hl opt">,</span> <span class="hl num">0.875</span><span class="hl opt">,</span> <span class="hl num">1.000</span><span class="hl opt">,</span> <span class="hl num">1.000</span><span class="hl opt">,</span>
		<span class="hl opt">};</span>
		<span class="hl kwd">drawAutoLightedCuboid</span><span class="hl opt">(</span>bar_x1<span class="hl opt">,</span> xrailuv<span class="hl opt">);</span>
		<span class="hl kwd">drawAutoLightedCuboid</span><span class="hl opt">(</span>bar_x2<span class="hl opt">,</span> xrailuv<span class="hl opt">);</span>
	<span class="hl opt">}</span>

	<span class="hl slc">// Now a section of fence, +Z, if there&apos;s a post there</span>
	p2 <span class="hl opt">=</span> p<span class="hl opt">;</span>
	p2<span class="hl opt">.</span>Z<span class="hl opt">++;</span>
	n2 <span class="hl opt">=</span> data<span class="hl opt">-&gt;</span>m_vmanip<span class="hl opt">.</span><span class="hl kwd">getNodeNoEx</span><span class="hl opt">(</span>blockpos_nodes <span class="hl opt">+</span> p2<span class="hl opt">);</span>
	f2 <span class="hl opt">= &amp;</span>nodedef<span class="hl opt">-&gt;</span><span class="hl kwd">get</span><span class="hl opt">(</span>n2<span class="hl opt">);</span>
	<span class="hl kwa">if</span> <span class="hl opt">(</span>f2<span class="hl opt">-&gt;</span>drawtype <span class="hl opt">==</span> NDT_FENCELIKE<span class="hl opt">) {</span>
		<span class="hl kwb">static const</span> aabb3f <span class="hl kwd">bar_z1</span><span class="hl opt">(-</span>bar_rad<span class="hl opt">,</span>  BS <span class="hl opt">/</span> <span class="hl num">4</span> <span class="hl opt">-</span> bar_rad<span class="hl opt">,</span> BS <span class="hl opt">/</span> <span class="hl num">2</span> <span class="hl opt">-</span> bar_len<span class="hl opt">,</span>
		                            bar_rad<span class="hl opt">,</span>  BS <span class="hl opt">/</span> <span class="hl num">4</span> <span class="hl opt">+</span> bar_rad<span class="hl opt">,</span> BS <span class="hl opt">/</span> <span class="hl num">2</span> <span class="hl opt">+</span> bar_len<span class="hl opt">);</span>
		<span class="hl kwb">static const</span> aabb3f <span class="hl kwd">bar_z2</span><span class="hl opt">(-</span>bar_rad<span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">4</span> <span class="hl opt">-</span> bar_rad<span class="hl opt">,</span> BS <span class="hl opt">/</span> <span class="hl num">2</span> <span class="hl opt">-</span> bar_len<span class="hl opt">,</span>
		                            bar_rad<span class="hl opt">, -</span>BS <span class="hl opt">/</span> <span class="hl num">4</span> <span class="hl opt">+</span> bar_rad<span class="hl opt">,</span> BS <span class="hl opt">/</span> <span class="hl num">2</span> <span class="hl opt">+</span> bar_len<span class="hl opt">);</span>
		<span class="hl kwb">static const</span> f32 zrailuv<span class="hl opt">[</span><span class="hl num">24</span><span class="hl opt">] = {</span>
			<span class="hl num">0.1875</span><span class="hl opt">,</span> <span class="hl num">0.0625</span><span class="hl opt">,</span> <span class="hl num">0.3125</span><span class="hl opt">,</span> <span class="hl num">0.3125</span><span class="hl opt">,</span> <span class="hl slc">// cannot rotate; stretch</span>
			<span class="hl num">0.2500</span><span class="hl opt">,</span> <span class="hl num">0.0625</span><span class="hl opt">,</span> <span class="hl num">0.3750</span><span class="hl opt">,</span> <span class="hl num">0.3125</span><span class="hl opt">,</span> <span class="hl slc">// for wood texture instead</span>
			<span class="hl num">0.0000</span><span class="hl opt">,</span> <span class="hl num">0.5625</span><span class="hl opt">,</span> <span class="hl num">1.0000</span><span class="hl opt">,</span> <span class="hl num">0.6875</span><span class="hl opt">,</span>
			<span class="hl num">0.0000</span><span class="hl opt">,</span> <span class="hl num">0.3750</span><span class="hl opt">,</span> <span class="hl num">1.0000</span><span class="hl opt">,</span> <span class="hl num">0.5000</span><span class="hl opt">,</span>
			<span class="hl num">0.3750</span><span class="hl opt">,</span> <span class="hl num">0.3750</span><span class="hl opt">,</span> <span class="hl num">0.5000</span><span class="hl opt">,</span> <span class="hl num">0.5000</span><span class="hl opt">,</span>
			<span class="hl num">0.6250</span><span class="hl opt">,</span> <span class="hl num">0.6250</span><span class="hl opt">,</span> <span class="hl num">0.7500</span><span class="hl opt">,</span> <span class="hl num">0.7500</span><span class="hl opt">,</span>
		<span class="hl opt">};</span>
		<span class="hl kwd">drawAutoLightedCuboid</span><span class="hl opt">(</span>bar_z1<span class="hl opt">,</span> zrailuv<span class="hl opt">);</span>
		<span class="hl kwd">drawAutoLightedCuboid</span><span class="hl opt">(</span>bar_z2<span class="hl opt">,</span> zrailuv<span class="hl opt">);</span>
	<span class="hl opt">}</span>
<span class="hl opt">}</span>

<span class="hl kwb">bool</span> <span class="hl kwc">MapblockMeshGenerator</span><span class="hl opt">::</span><span class="hl kwd">isSameRail</span><span class="hl opt">(</span>v3s16 dir<span class="hl opt">)</span>
<span class="hl opt">{</span>
	MapNode node2 <span class="hl opt">=</span> data<span class="hl opt">-&gt;</span>m_vmanip<span class="hl opt">.</span><span class="hl kwd">getNodeNoEx</span><span class="hl opt">(</span>blockpos_nodes <span class="hl opt">+</span> p <span class="hl opt">+</span> dir<span class="hl opt">);</span>
	<span class="hl kwa">if</span> <span class="hl opt">(</span>node2<span class="hl opt">.</span><span class="hl kwd">getContent</span><span class="hl opt">() ==</span> n<span class="hl opt">.</span><span class="hl kwd">getContent</span><span class="hl opt">())</span>
		<span class="hl kwa">return true</span><span class="hl opt">;</span>
	<span class="hl kwb">const</span> ContentFeatures <span class="hl opt">&amp;</span>def2 <span class="hl opt">=</span> nodedef<span class="hl opt">-&gt;</span><span class="hl kwd">get</span><span class="hl opt">(</span>node2<span class="hl opt">);</span>
	<span class="hl kwa">return</span> <span class="hl opt">((</span>def2<span class="hl opt">.</span>drawtype <span class="hl opt">==</span> NDT_RAILLIKE<span class="hl opt">) &amp;&amp;</span>
		<span class="hl opt">(</span>def2<span class="hl opt">.</span><span class="hl kwd">getGroup</span><span class="hl opt">(</span>raillike_groupname<span class="hl opt">) ==</span> raillike_group<span class="hl opt">));</span>
<span class="hl opt">}</span>

<span class="hl kwb">void</span> <span class="hl kwc">MapblockMeshGenerator</span><span class="hl opt">::</span><span class="hl kwd">drawRaillikeNode</span><span class="hl opt">()</span>
<span class="hl opt">{</span>
	<span class="hl kwb">static const</span> v3s16 direction<span class="hl opt">[</span><span class="hl num">4</span><span class="hl opt">] = {</span>
		<span class="hl kwd">v3s16</span><span class="hl opt">(</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span>  <span class="hl num">1</span><span class="hl opt">),</span>
		<span class="hl kwd">v3s16</span><span class="hl opt">(</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">, -</span><span class="hl num">1</span><span class="hl opt">),</span>
		<span class="hl kwd">v3s16</span><span class="hl opt">(-</span><span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span>  <span class="hl num">0</span><span class="hl opt">),</span>
		<span class="hl kwd">v3s16</span><span class="hl opt">(</span> <span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span>  <span class="hl num">0</span><span class="hl opt">),</span>
	<span class="hl opt">};</span>
	<span class="hl kwb">static const int</span> slope_angle<span class="hl opt">[</span><span class="hl num">4</span><span class="hl opt">] = {</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">180</span><span class="hl opt">,</span> <span class="hl num">90</span><span class="hl opt">, -</span><span class="hl num">90</span><span class="hl opt">};</span>

	<span class="hl kwb">enum</span> RailTile <span class="hl opt">{</span>
		straight<span class="hl opt">,</span>
		curved<span class="hl opt">,</span>
		junction<span class="hl opt">,</span>
		cross<span class="hl opt">,</span>
	<span class="hl opt">};</span>
	<span class="hl kwb">struct</span> RailDesc <span class="hl opt">{</span>
		<span class="hl kwb">int</span> tile_index<span class="hl opt">;</span>
		<span class="hl kwb">int</span> angle<span class="hl opt">;</span>
	<span class="hl opt">};</span>
	<span class="hl kwb">static const</span> RailDesc rail_kinds<span class="hl opt">[</span><span class="hl num">16</span><span class="hl opt">] = {</span>
		                   <span class="hl slc">// +x -x -z +z</span>
		                   <span class="hl slc">//-------------</span>
		<span class="hl opt">{</span>straight<span class="hl opt">,</span>   <span class="hl num">0</span><span class="hl opt">},</span> <span class="hl slc">//  .  .  .  .</span>
		<span class="hl opt">{</span>straight<span class="hl opt">,</span>   <span class="hl num">0</span><span class="hl opt">},</span> <span class="hl slc">//  .  .  . +Z</span>
		<span class="hl opt">{</span>straight<span class="hl opt">,</span>   <span class="hl num">0</span><span class="hl opt">},</span> <span class="hl slc">//  .  . -Z  .</span>
		<span class="hl opt">{</span>straight<span class="hl opt">,</span>   <span class="hl num">0</span><span class="hl opt">},</span> <span class="hl slc">//  .  . -Z +Z</span>
		<span class="hl opt">{</span>straight<span class="hl opt">,</span>  <span class="hl num">90</span><span class="hl opt">},</span> <span class="hl slc">//  . -X  .  .</span>
		<span class="hl opt">{</span>  curved<span class="hl opt">,</span> <span class="hl num">180</span><span class="hl opt">},</span> <span class="hl slc">//  . -X  . +Z</span>
		<span class="hl opt">{</span>  curved<span class="hl opt">,</span> <span class="hl num">270</span><span class="hl opt">},</span> <span class="hl slc">//  . -X -Z  .</span>
		<span class="hl opt">{</span>junction<span class="hl opt">,</span> <span class="hl num">180</span><span class="hl opt">},</span> <span class="hl slc">//  . -X -Z +Z</span>
		<span class="hl opt">{</span>straight<span class="hl opt">,</span>  <span class="hl num">90</span><span class="hl opt">},</span> <span class="hl slc">// +X  .  .  .</span>
		<span class="hl opt">{</span>  curved<span class="hl opt">,</span>  <span class="hl num">90</span><span class="hl opt">},</span> <span class="hl slc">// +X  .  . +Z</span>
		<span class="hl opt">{</span>  curved<span class="hl opt">,</span>   <span class="hl num">0</span><span class="hl opt">},</span> <span class="hl slc">// +X  . -Z  .</span>
		<span class="hl opt">{</span>junction<span class="hl opt">,</span>   <span class="hl num">0</span><span class="hl opt">},</span> <span class="hl slc">// +X  . -Z +Z</span>
		<span class="hl opt">{</span>straight<span class="hl opt">,</span>  <span class="hl num">90</span><span class="hl opt">},</span> <span class="hl slc">// +X -X  .  .</span>
		<span class="hl opt">{</span>junction<span class="hl opt">,</span>  <span class="hl num">90</span><span class="hl opt">},</span> <span class="hl slc">// +X -X  . +Z</span>
		<span class="hl opt">{</span>junction<span class="hl opt">,</span> <span class="hl num">270</span><span class="hl opt">},</span> <span class="hl slc">// +X -X -Z  .</span>
		<span class="hl opt">{</span>   cross<span class="hl opt">,</span>   <span class="hl num">0</span><span class="hl opt">},</span> <span class="hl slc">// +X -X -Z +Z</span>
	<span class="hl opt">};</span>

	raillike_group <span class="hl opt">=</span> nodedef<span class="hl opt">-&gt;</span><span class="hl kwd">get</span><span class="hl opt">(</span>n<span class="hl opt">).</span><span class="hl kwd">getGroup</span><span class="hl opt">(</span>raillike_groupname<span class="hl opt">);</span>

	<span class="hl kwb">int</span> code <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span>
	<span class="hl kwb">int</span> angle<span class="hl opt">;</span>
	<span class="hl kwb">int</span> tile_index<span class="hl opt">;</span>
	<span class="hl kwb">bool</span> sloped <span class="hl opt">=</span> <span class="hl kwa">false</span><span class="hl opt">;</span>
	<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> dir <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> dir <span class="hl opt">&lt;</span> <span class="hl num">4</span><span class="hl opt">;</span> dir<span class="hl opt">++) {</span>
		<span class="hl kwb">bool</span> rail_above <span class="hl opt">=</span> <span class="hl kwd">isSameRail</span><span class="hl opt">(</span>direction<span class="hl opt">[</span>dir<span class="hl opt">] +</span> <span class="hl kwd">v3s16</span><span class="hl opt">(</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">));</span>
		<span class="hl kwa">if</span> <span class="hl opt">(</span>rail_above<span class="hl opt">) {</span>
			sloped <span class="hl opt">=</span> <span class="hl kwa">true</span><span class="hl opt">;</span>
			angle <span class="hl opt">=</span> slope_angle<span class="hl opt">[</span>dir<span class="hl opt">];</span>
		<span class="hl opt">}</span>
		<span class="hl kwa">if</span> <span class="hl opt">(</span>rail_above <span class="hl opt">||</span>
				<span class="hl kwd">isSameRail</span><span class="hl opt">(</span>direction<span class="hl opt">[</span>dir<span class="hl opt">]) ||</span>
				<span class="hl kwd">isSameRail</span><span class="hl opt">(</span>direction<span class="hl opt">[</span>dir<span class="hl opt">] +</span> <span class="hl kwd">v3s16</span><span class="hl opt">(</span><span class="hl num">0</span><span class="hl opt">, -</span><span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">)))</span>
			code <span class="hl opt">|=</span> <span class="hl num">1</span> <span class="hl opt">&lt;&lt;</span> dir<span class="hl opt">;</span>
	<span class="hl opt">}</span>

	<span class="hl kwa">if</span> <span class="hl opt">(</span>sloped<span class="hl opt">) {</span>
		tile_index <span class="hl opt">=</span> straight<span class="hl opt">;</span>
	<span class="hl opt">}</span> <span class="hl kwa">else</span> <span class="hl opt">{</span>
		tile_index <span class="hl opt">=</span> rail_kinds<span class="hl opt">[</span>code<span class="hl opt">].</span>tile_index<span class="hl opt">;</span>
		angle <span class="hl opt">=</span> rail_kinds<span class="hl opt">[</span>code<span class="hl opt">].</span>angle<span class="hl opt">;</span>
	<span class="hl opt">}</span>

	<span class="hl kwd">useTile</span><span class="hl opt">(</span>tile_index<span class="hl opt">,</span> MATERIAL_FLAG_CRACK_OVERLAY<span class="hl opt">,</span> MATERIAL_FLAG_BACKFACE_CULLING<span class="hl opt">);</span>

	<span class="hl kwb">static const float</span> offset <span class="hl opt">=</span> BS <span class="hl opt">/</span> <span class="hl num">64</span><span class="hl opt">;</span>
	<span class="hl kwb">static const float</span> size   <span class="hl opt">=</span> BS <span class="hl opt">/</span> <span class="hl num">2</span><span class="hl opt">;</span>
	<span class="hl kwb">float</span> y2 <span class="hl opt">=</span> sloped <span class="hl opt">?</span> size <span class="hl opt">: -</span>size<span class="hl opt">;</span>
	v3f vertices<span class="hl opt">[</span><span class="hl num">4</span><span class="hl opt">] = {</span>
		<span class="hl kwd">v3f</span><span class="hl opt">(-</span>size<span class="hl opt">,</span>    y2 <span class="hl opt">+</span> offset<span class="hl opt">,</span>  size<span class="hl opt">),</span>
		<span class="hl kwd">v3f</span><span class="hl opt">(</span> size<span class="hl opt">,</span>    y2 <span class="hl opt">+</span> offset<span class="hl opt">,</span>  size<span class="hl opt">),</span>
		<span class="hl kwd">v3f</span><span class="hl opt">(</span> size<span class="hl opt">, -</span>size <span class="hl opt">+</span> offset<span class="hl opt">, -</span>size<span class="hl opt">),</span>
		<span class="hl kwd">v3f</span><span class="hl opt">(-</span>size<span class="hl opt">, -</span>size <span class="hl opt">+</span> offset<span class="hl opt">, -</span>size<span class="hl opt">),</span>
	<span class="hl opt">};</span>
	<span class="hl kwa">if</span> <span class="hl opt">(</span>angle<span class="hl opt">)</span>
		<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> i <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> i <span class="hl opt">&lt;</span> <span class="hl num">4</span><span class="hl opt">;</span> i<span class="hl opt">++)</span>
			vertices<span class="hl opt">[</span>i<span class="hl opt">].</span><span class="hl kwd">rotateXZBy</span><span class="hl opt">(</span>angle<span class="hl opt">);</span>
	<span class="hl kwd">drawQuad</span><span class="hl opt">(</span>vertices<span class="hl opt">);</span>
<span class="hl opt">}</span>

<span class="hl kwb">void</span> <span class="hl kwc">MapblockMeshGenerator</span><span class="hl opt">::</span><span class="hl kwd">drawNodeboxNode</span><span class="hl opt">()</span>
<span class="hl opt">{</span>
	<span class="hl kwb">static const</span> v3s16 tile_dirs<span class="hl opt">[</span><span class="hl num">6</span><span class="hl opt">] = {</span>
		<span class="hl kwd">v3s16</span><span class="hl opt">(</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">),</span>
		<span class="hl kwd">v3s16</span><span class="hl opt">(</span><span class="hl num">0</span><span class="hl opt">, -</span><span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">),</span>
		<span class="hl kwd">v3s16</span><span class="hl opt">(</span><span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">),</span>
		<span class="hl kwd">v3s16</span><span class="hl opt">(-</span><span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">),</span>
		<span class="hl kwd">v3s16</span><span class="hl opt">(</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">),</span>
		<span class="hl kwd">v3s16</span><span class="hl opt">(</span><span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">, -</span><span class="hl num">1</span><span class="hl opt">)</span>
	<span class="hl opt">};</span>

	<span class="hl slc">// we have this order for some reason...</span>
	<span class="hl kwb">static const</span> v3s16 connection_dirs<span class="hl opt">[</span><span class="hl num">6</span><span class="hl opt">] = {</span>
		<span class="hl kwd">v3s16</span><span class="hl opt">(</span> <span class="hl num">0</span><span class="hl opt">,</span>  <span class="hl num">1</span><span class="hl opt">,</span>  <span class="hl num">0</span><span class="hl opt">),</span> <span class="hl slc">// top</span>
		<span class="hl kwd">v3s16</span><span class="hl opt">(</span> <span class="hl num">0</span><span class="hl opt">, -</span><span class="hl num">1</span><span class="hl opt">,</span>  <span class="hl num">0</span><span class="hl opt">),</span> <span class="hl slc">// bottom</span>
		<span class="hl kwd">v3s16</span><span class="hl opt">(</span> <span class="hl num">0</span><span class="hl opt">,</span>  <span class="hl num">0</span><span class="hl opt">, -</span><span class="hl num">1</span><span class="hl opt">),</span> <span class="hl slc">// front</span>
		<span class="hl kwd">v3s16</span><span class="hl opt">(-</span><span class="hl num">1</span><span class="hl opt">,</span>  <span class="hl num">0</span><span class="hl opt">,</span>  <span class="hl num">0</span><span class="hl opt">),</span> <span class="hl slc">// left</span>
		<span class="hl kwd">v3s16</span><span class="hl opt">(</span> <span class="hl num">0</span><span class="hl opt">,</span>  <span class="hl num">0</span><span class="hl opt">,</span>  <span class="hl num">1</span><span class="hl opt">),</span> <span class="hl slc">// back</span>
		<span class="hl kwd">v3s16</span><span class="hl opt">(</span> <span class="hl num">1</span><span class="hl opt">,</span>  <span class="hl num">0</span><span class="hl opt">,</span>  <span class="hl num">0</span><span class="hl opt">),</span> <span class="hl slc">// right</span>
	<span class="hl opt">};</span>

	TileSpec tiles<span class="hl opt">[</span><span class="hl num">6</span><span class="hl opt">];</span>
	<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> face <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> face <span class="hl opt">&lt;</span> <span class="hl num">6</span><span class="hl opt">;</span> face<span class="hl opt">++) {</span>
		<span class="hl slc">// Handles facedir rotation for textures</span>
		<span class="hl kwd">getTile</span><span class="hl opt">(</span>tile_dirs<span class="hl opt">[</span>face<span class="hl opt">], &amp;</span>tiles<span class="hl opt">[</span>face<span class="hl opt">]);</span>
	<span class="hl opt">}</span>

	<span class="hl slc">// locate possible neighboring nodes to connect to</span>
	<span class="hl kwb">int</span> neighbors_set <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span>
	<span class="hl kwa">if</span> <span class="hl opt">(</span>f<span class="hl opt">-&gt;</span>node_box<span class="hl opt">.</span>type <span class="hl opt">==</span> NODEBOX_CONNECTED<span class="hl opt">) {</span>
		<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> dir <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> dir <span class="hl opt">!=</span> <span class="hl num">6</span><span class="hl opt">;</span> dir<span class="hl opt">++) {</span>
			<span class="hl kwb">int</span> flag <span class="hl opt">=</span> <span class="hl num">1</span> <span class="hl opt">&lt;&lt;</span> dir<span class="hl opt">;</span>
			v3s16 p2 <span class="hl opt">=</span> blockpos_nodes <span class="hl opt">+</span> p <span class="hl opt">+</span> connection_dirs<span class="hl opt">[</span>dir<span class="hl opt">];</span>
			MapNode n2 <span class="hl opt">=</span> data<span class="hl opt">-&gt;</span>m_vmanip<span class="hl opt">.</span><span class="hl kwd">getNodeNoEx</span><span class="hl opt">(</span>p2<span class="hl opt">);</span>
			<span class="hl kwa">if</span> <span class="hl opt">(</span>nodedef<span class="hl opt">-&gt;</span><span class="hl kwd">nodeboxConnects</span><span class="hl opt">(</span>n<span class="hl opt">,</span> n2<span class="hl opt">,</span> flag<span class="hl opt">))</span>
				neighbors_set <span class="hl opt">|=</span> flag<span class="hl opt">;</span>
		<span class="hl opt">}</span>
	<span class="hl opt">}</span>

	<span class="hl kwc">std</span><span class="hl opt">::</span>vector<span class="hl opt">&lt;</span>aabb3f<span class="hl opt">&gt;</span> boxes<span class="hl opt">;</span>
	n<span class="hl opt">.</span><span class="hl kwd">getNodeBoxes</span><span class="hl opt">(</span>nodedef<span class="hl opt">, &amp;</span>boxes<span class="hl opt">,</span> neighbors_set<span class="hl opt">);</span>
	<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwc">std</span><span class="hl opt">::</span>vector<span class="hl opt">&lt;</span>aabb3f<span class="hl opt">&gt;::</span>iterator i <span class="hl opt">=</span> boxes<span class="hl opt">.</span><span class="hl kwd">begin</span><span class="hl opt">();</span> i <span class="hl opt">!=</span> boxes<span class="hl opt">.</span><span class="hl kwd">end</span><span class="hl opt">(); ++</span>i<span class="hl opt">)</span>
		<span class="hl kwd">drawAutoLightedCuboid</span><span class="hl opt">(*</span>i<span class="hl opt">,</span> NULL<span class="hl opt">,</span> tiles<span class="hl opt">,</span> <span class="hl num">6</span><span class="hl opt">);</span>
<span class="hl opt">}</span>

<span class="hl kwb">void</span> <span class="hl kwc">MapblockMeshGenerator</span><span class="hl opt">::</span><span class="hl kwd">drawMeshNode</span><span class="hl opt">()</span>
<span class="hl opt">{</span>
	u8 facedir <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span>
	<span class="hl kwc">scene</span><span class="hl opt">::</span>IMesh<span class="hl opt">*</span> mesh<span class="hl opt">;</span>
	<span class="hl kwb">bool</span> private_mesh<span class="hl opt">;</span> <span class="hl slc">// as a grab/drop pair is not thread-safe</span>

	<span class="hl kwa">if</span> <span class="hl opt">(</span>f<span class="hl opt">-&gt;</span>param_type_2 <span class="hl opt">==</span> CPT2_FACEDIR <span class="hl opt">||</span>
			f<span class="hl opt">-&gt;</span>param_type_2 <span class="hl opt">==</span> CPT2_COLORED_FACEDIR<span class="hl opt">) {</span>
		facedir <span class="hl opt">=</span> n<span class="hl opt">.</span><span class="hl kwd">getFaceDir</span><span class="hl opt">(</span>nodedef<span class="hl opt">);</span>
	<span class="hl opt">}</span> <span class="hl kwa">else if</span> <span class="hl opt">(</span>f<span class="hl opt">-&gt;</span>param_type_2 <span class="hl opt">==</span> CPT2_WALLMOUNTED <span class="hl opt">||</span>
			f<span class="hl opt">-&gt;</span>param_type_2 <span class="hl opt">==</span> CPT2_COLORED_WALLMOUNTED<span class="hl opt">) {</span>
		<span class="hl slc">// Convert wallmounted to 6dfacedir.</span>
		<span class="hl slc">// When cache enabled, it is already converted.</span>
		facedir <span class="hl opt">=</span> n<span class="hl opt">.</span><span class="hl kwd">getWallMounted</span><span class="hl opt">(</span>nodedef<span class="hl opt">);</span>
		<span class="hl kwa">if</span> <span class="hl opt">(!</span>enable_mesh_cache<span class="hl opt">) {</span>
			<span class="hl kwb">static const</span> u8 wm_to_6d<span class="hl opt">[</span><span class="hl num">6</span><span class="hl opt">] = {</span><span class="hl num">20</span><span class="hl opt">,</span> <span class="hl num">0</span><span class="hl opt">,</span> <span class="hl num">16</span> <span class="hl opt">+</span> <span class="hl num">1</span><span class="hl opt">,</span> <span class="hl num">12</span> <span class="hl opt">+</span> <span class="hl num">3</span><span class="hl opt">,</span> <span class="hl num">8</span><span class="hl opt">,</span> <span class="hl num">4</span> <span class="hl opt">+</span> <span class="hl num">2</span><span class="hl opt">};</span>
			facedir <span class="hl opt">=</span> wm_to_6d<span class="hl opt">[</span>facedir<span class="hl opt">];</span>
		<span class="hl opt">}</span>
	<span class="hl opt">}</span>

	<span class="hl kwa">if</span> <span class="hl opt">(!</span>data<span class="hl opt">-&gt;</span>m_smooth_lighting <span class="hl opt">&amp;&amp;</span> f<span class="hl opt">-&gt;</span>mesh_ptr<span class="hl opt">[</span>facedir<span class="hl opt">]) {</span>
		<span class="hl slc">// use cached meshes</span>
		private_mesh <span class="hl opt">=</span> <span class="hl kwa">false</span><span class="hl opt">;</span>
		mesh <span class="hl opt">=</span> f<span class="hl opt">-&gt;</span>mesh_ptr<span class="hl opt">[</span>facedir<span class="hl opt">];</span>
	<span class="hl opt">}</span> <span class="hl kwa">else if</span> <span class="hl opt">(</span>f<span class="hl opt">-&gt;</span>mesh_ptr<span class="hl opt">[</span><span class="hl num">0</span><span class="hl opt">]) {</span>
		<span class="hl slc">// no cache, clone and rotate mesh</span>
		private_mesh <span class="hl opt">=</span> <span class="hl kwa">true</span><span class="hl opt">;</span>
		mesh <span class="hl opt">=</span> <span class="hl kwd">cloneMesh</span><span class="hl opt">(</span>f<span class="hl opt">-&gt;</span>mesh_ptr<span class="hl opt">[</span><span class="hl num">0</span><span class="hl opt">]);</span>
		<span class="hl kwd">rotateMeshBy6dFacedir</span><span class="hl opt">(</span>mesh<span class="hl opt">,</span> facedir<span class="hl opt">);</span>
		<span class="hl kwd">recalculateBoundingBox</span><span class="hl opt">(</span>mesh<span class="hl opt">);</span>
		meshmanip<span class="hl opt">-&gt;</span><span class="hl kwd">recalculateNormals</span><span class="hl opt">(</span>mesh<span class="hl opt">,</span> <span class="hl kwa">true</span><span class="hl opt">,</span> <span class="hl kwa">false</span><span class="hl opt">);</span>
	<span class="hl opt">}</span> <span class="hl kwa">else</span>
		<span class="hl kwa">return</span><span class="hl opt">;</span>

	<span class="hl kwb">int</span> mesh_buffer_count <span class="hl opt">=</span> mesh<span class="hl opt">-&gt;</span><span class="hl kwd">getMeshBufferCount</span><span class="hl opt">();</span>
	<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> j <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> j <span class="hl opt">&lt;</span> mesh_buffer_count<span class="hl opt">;</span> j<span class="hl opt">++) {</span>
		<span class="hl kwd">useTile</span><span class="hl opt">(</span>j<span class="hl opt">);</span>
		<span class="hl kwc">scene</span><span class="hl opt">::</span>IMeshBuffer <span class="hl opt">*</span>buf <span class="hl opt">=</span> mesh<span class="hl opt">-&gt;</span><span class="hl kwd">getMeshBuffer</span><span class="hl opt">(</span>j<span class="hl opt">);</span>
		<span class="hl kwc">video</span><span class="hl opt">::</span>S3DVertex <span class="hl opt">*</span>vertices <span class="hl opt">= (</span><span class="hl kwc">video</span><span class="hl opt">::</span>S3DVertex <span class="hl opt">*)</span>buf<span class="hl opt">-&gt;</span><span class="hl kwd">getVertices</span><span class="hl opt">();</span>
		<span class="hl kwb">int</span> vertex_count <span class="hl opt">=</span> buf<span class="hl opt">-&gt;</span><span class="hl kwd">getVertexCount</span><span class="hl opt">();</span>

		<span class="hl kwa">if</span> <span class="hl opt">(</span>data<span class="hl opt">-&gt;</span>m_smooth_lighting<span class="hl opt">) {</span>
			<span class="hl slc">// Mesh is always private here. So the lighting is applied to each</span>
			<span class="hl slc">// vertex right here.</span>
			<span class="hl kwa">for</span> <span class="hl opt">(</span><span class="hl kwb">int</span> k <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> k <span class="hl opt">&lt;</span> vertex_count<span class="hl opt">;</span> k<span class="hl opt">++) {</span>
				<span class="hl kwc">video</span><span class="hl opt">::</span>S3DVertex <span class="hl opt">&amp;</span>vertex <span class="hl opt">=</span> vertices<span class="hl opt">[</span>k<span class="hl opt">];</span>
				vertex<span class="hl opt">.</span>Color <span class="hl opt">=</span> <span class="hl kwd">blendLightColor</span><span class="hl opt">(</span>vertex<span class="hl opt">.</span>Pos<span class="hl opt">,</span> vertex<span class="hl opt">.</span>Normal<span class="hl opt">);</span>
				vertex<span class="hl opt">.</span>Pos <span class="hl opt">+=</span> origin<span class="hl opt">;</span>
			<span class="hl opt">}</span>
			collector<span class="hl opt">-&gt;</span><span class="hl kwd">append</span><span class="hl opt">(</span>tile<span class="hl opt">,</span> vertices<span class="hl opt">,</span> vertex_count<span class="hl opt">,</span>
				buf<span class="hl opt">-&gt;</span><span class="hl kwd">getIndices</span><span class="hl opt">(),</span> buf<span class="hl opt">-&gt;</span><span class="hl kwd">getIndexCount</span><span class="hl opt">());</span>
		<span class="hl opt">}</span> <span class="hl kwa">else</span> <span class="hl opt">{</span>
			<span class="hl slc">// Don&apos;t modify the mesh, it may not be private here.</span>
			<span class="hl slc">// Instead, let the collector process colors, etc.</span>
			collector<span class="hl opt">-&gt;</span><span class="hl kwd">append</span><span class="hl opt">(</span>tile<span class="hl opt">,</span> vertices<span class="hl opt">,</span> vertex_count<span class="hl opt">,</span>
				buf<span class="hl opt">-&gt;</span><span class="hl kwd">getIndices</span><span class="hl opt">(),</span> buf<span class="hl opt">-&gt;</span><span class="hl kwd">getIndexCount</span><span class="hl opt">(),</span> origin<span class="hl opt">,</span>
				color<span class="hl opt">,</span> f<span class="hl opt">-&gt;</span>light_source<span class="hl opt">);</span>
		<span class="hl opt">}</span>
	<span class="hl opt">}</span>
	<span class="hl kwa">if</span> <span class="hl opt">(</span>private_mesh<span class="hl opt">)</span>
		mesh<span class="hl opt">-&gt;</span><span class="hl kwd">drop</span><span class="hl opt">();</span>
<span class="hl opt">}</span>

<span class="hl slc">// also called when the drawtype is known but should have been pre-converted</span>
<span class="hl kwb">void</span> <span class="hl kwc">MapblockMeshGenerator</span><span class="hl opt">::</span><span class="hl kwd">errorUnknownDrawtype</span><span class="hl opt">()</span>
<span class="hl opt">{</span>
	infostream <span class="hl opt">&lt;&lt;</span> <span class="hl str">&quot;Got drawtype &quot;</span> <span class="hl opt">&lt;&lt;</span> f<span class="hl opt">-&gt;</span>drawtype <span class="hl opt">&lt;&lt;</span> <span class="hl kwc">std</span><span class="hl opt">::</span>endl<span class="hl opt">;</span>
	<span class="hl kwd">FATAL_ERROR</span><span class="hl opt">(</span><span class="hl str">&quot;Unknown drawtype&quot;</span><span class="hl opt">);</span>
<span class="hl opt">}</span>

<span class="hl kwb">void</span> <span class="hl kwc">MapblockMeshGenerator</span><span class="hl opt">::</span><span class="hl kwd">drawNode</span><span class="hl opt">()</span>
<span class="hl opt">{</span>
	<span class="hl slc">// skip some drawtypes early</span>
	<span class="hl kwa">switch</span> <span class="hl opt">(</span>f<span class="hl opt">-&gt;</span>drawtype<span class="hl opt">) {</span>
		<span class="hl kwa">case</span> NDT_NORMAL<span class="hl opt">:</span>   <span class="hl slc">// Drawn by MapBlockMesh</span>
		<span class="hl kwa">case</span> NDT_AIRLIKE<span class="hl opt">:</span>  <span class="hl slc">// Not drawn at all</span>
		<span class="hl kwa">case</span> NDT_LIQUID<span class="hl opt">:</span>   <span class="hl slc">// Drawn by MapBlockMesh</span>
			<span class="hl kwa">return</span><span class="hl opt">;</span>
		<span class="hl kwa">default</span><span class="hl opt">:</span>
			<span class="hl kwa">break</span><span class="hl opt">;</span>
	<span class="hl opt">}</span>
	origin <span class="hl opt">=</span> <span class="hl kwd">intToFloat</span><span class="hl opt">(</span>p<span class="hl opt">,</span> BS<span class="hl opt">);</span>
	<span class="hl kwa">if</span> <span class="hl opt">(</span>data<span class="hl opt">-&gt;</span>m_smooth_lighting<span class="hl opt">)</span>
		<span class="hl kwd">getSmoothLightFrame</span><span class="hl opt">();</span>
	<span class="hl kwa">else</span>
		light <span class="hl opt">=</span> <span class="hl kwd">getInteriorLight</span><span class="hl opt">(</span>n<span class="hl opt">,</span> <span class="hl num">1</span><span class="hl opt">,</span> nodedef<span class="hl opt">);</span>
	<span class="hl kwa">switch</span> <span class="hl opt">(</span>f<span class="hl opt">-&gt;</span>drawtype<span class="hl opt">) {</span>
		<span class="hl kwa">case</span> NDT_FLOWINGLIQUID<span class="hl opt">:</span>     <span class="hl kwd">drawLiquidNode</span><span class="hl opt">();</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
		<span class="hl kwa">case</span> NDT_GLASSLIKE<span class="hl opt">:</span>         <span class="hl kwd">drawGlasslikeNode</span><span class="hl opt">();</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
		<span class="hl kwa">case</span> NDT_GLASSLIKE_FRAMED<span class="hl opt">:</span>  <span class="hl kwd">drawGlasslikeFramedNode</span><span class="hl opt">();</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
		<span class="hl kwa">case</span> NDT_ALLFACES<span class="hl opt">:</span>          <span class="hl kwd">drawAllfacesNode</span><span class="hl opt">();</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
		<span class="hl kwa">case</span> NDT_TORCHLIKE<span class="hl opt">:</span>         <span class="hl kwd">drawTorchlikeNode</span><span class="hl opt">();</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
		<span class="hl kwa">case</span> NDT_SIGNLIKE<span class="hl opt">:</span>          <span class="hl kwd">drawSignlikeNode</span><span class="hl opt">();</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
		<span class="hl kwa">case</span> NDT_PLANTLIKE<span class="hl opt">:</span>         <span class="hl kwd">drawPlantlikeNode</span><span class="hl opt">();</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
		<span class="hl kwa">case</span> NDT_PLANTLIKE_ROOTED<span class="hl opt">:</span>  <span class="hl kwd">drawPlantlikeRootedNode</span><span class="hl opt">();</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
		<span class="hl kwa">case</span> NDT_FIRELIKE<span class="hl opt">:</span>          <span class="hl kwd">drawFirelikeNode</span><span class="hl opt">();</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
		<span class="hl kwa">case</span> NDT_FENCELIKE<span class="hl opt">:</span>         <span class="hl kwd">drawFencelikeNode</span><span class="hl opt">();</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
		<span class="hl kwa">case</span> NDT_RAILLIKE<span class="hl opt">:</span>          <span class="hl kwd">drawRaillikeNode</span><span class="hl opt">();</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
		<span class="hl kwa">case</span> NDT_NODEBOX<span class="hl opt">:</span>           <span class="hl kwd">drawNodeboxNode</span><span class="hl opt">();</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
		<span class="hl kwa">case</span> NDT_MESH<span class="hl opt">:</span>              <span class="hl kwd">drawMeshNode</span><span class="hl opt">();</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
		<span class="hl kwa">default</span><span class="hl opt">:</span>                    <span class="hl kwd">errorUnknownDrawtype</span><span class="hl opt">();</span> <span class="hl kwa">break</span><span class="hl opt">;</span>
	<span class="hl opt">}</span>
<span class="hl opt">}</span>

<span class="hl com">/*</span>
<span class="hl com">	TODO: Fix alpha blending for special nodes</span>
<span class="hl com">	Currently only the last element rendered is blended correct</span>
<span class="hl com">*/</span>
<span class="hl kwb">void</span> <span class="hl kwc">MapblockMeshGenerator</span><span class="hl opt">::</span><span class="hl kwd">generate</span><span class="hl opt">()</span>
<span class="hl opt">{</span>
	<span class="hl kwa">for</span> <span class="hl opt">(</span>p<span class="hl opt">.</span>Z <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> p<span class="hl opt">.</span>Z <span class="hl opt">&lt;</span> MAP_BLOCKSIZE<span class="hl opt">;</span> p<span class="hl opt">.</span>Z<span class="hl opt">++)</span>
	<span class="hl kwa">for</span> <span class="hl opt">(</span>p<span class="hl opt">.</span>Y <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> p<span class="hl opt">.</span>Y <span class="hl opt">&lt;</span> MAP_BLOCKSIZE<span class="hl opt">;</span> p<span class="hl opt">.</span>Y<span class="hl opt">++)</span>
	<span class="hl kwa">for</span> <span class="hl opt">(</span>p<span class="hl opt">.</span>X <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span> p<span class="hl opt">.</span>X <span class="hl opt">&lt;</span> MAP_BLOCKSIZE<span class="hl opt">;</span> p<span class="hl opt">.</span>X<span class="hl opt">++) {</span>
		n <span class="hl opt">=</span> data<span class="hl opt">-&gt;</span>m_vmanip<span class="hl opt">.</span><span class="hl kwd">getNodeNoEx</span><span class="hl opt">(</span>blockpos_nodes <span class="hl opt">+</span> p<span class="hl opt">);</span>
		f <span class="hl opt">= &amp;</span>nodedef<span class="hl opt">-&gt;</span><span class="hl kwd">get</span><span class="hl opt">(</span>n<span class="hl opt">);</span>
		<span class="hl kwd">drawNode</span><span class="hl opt">();</span>
	<span class="hl opt">}</span>
<span class="hl opt">}</span>
</code></pre></td></tr></table>
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s opaque.  It is implemented by
** the pluggable module.  The SQLite core has no knowledge of
** its size or internal structure and never deals with the
** sqlite3_pcache object except by holding and passing pointers
** to the object.
**
** See [sqlite3_pcache_methods] for additional information.
*/
typedef struct sqlite3_pcache sqlite3_pcache;

/*
** CAPI3REF: Application Defined Page Cache.
** KEYWORDS: {page cache}
**
** ^(The [sqlite3_config]([SQLITE_CONFIG_PCACHE], ...) interface can
** register an alternative page cache implementation by passing in an 
** instance of the sqlite3_pcache_methods structure.)^
** In many applications, most of the heap memory allocated by 
** SQLite is used for the page cache.
** By implementing a 
** custom page cache using this API, an application can better control
** the amount of memory consumed by SQLite, the way in which 
** that memory is allocated and released, and the policies used to 
** determine exactly which parts of a database file are cached and for 
** how long.
**
** The alternative page cache mechanism is an
** extreme measure that is only needed by the most demanding applications.
** The built-in page cache is recommended for most uses.
**
** ^(The contents of the sqlite3_pcache_methods structure are copied to an
** internal buffer by SQLite within the call to [sqlite3_config].  Hence
** the application may discard the parameter after the call to
** [sqlite3_config()] returns.)^
**
** [[the xInit() page cache method]]
** ^(The xInit() method is called once for each effective 
** call to [sqlite3_initialize()])^
** (usually only once during the lifetime of the process). ^(The xInit()
** method is passed a copy of the sqlite3_pcache_methods.pArg value.)^
** The intent of the xInit() method is to set up global data structures 
** required by the custom page cache implementation. 
** ^(If the xInit() method is NULL, then the 
** built-in default page cache is used instead of the application defined
** page cache.)^
**
** [[the xShutdown() page cache method]]
** ^The xShutdown() method is called by [sqlite3_shutdown()].
** It can be used to clean up 
** any outstanding resources before process shutdown, if required.
** ^The xShutdown() method may be NULL.
**
** ^SQLite automatically serializes calls to the xInit method,
** so the xInit method need not be threadsafe.  ^The
** xShutdown method is only called from [sqlite3_shutdown()] so it does
** not need to be threadsafe either.  All other methods must be threadsafe
** in multithreaded applications.
**
** ^SQLite will never invoke xInit() more than once without an intervening
** call to xShutdown().
**
** [[the xCreate() page cache methods]]
** ^SQLite invokes the xCreate() method to construct a new cache instance.
** SQLite will typically create one cache instance for each open database file,
** though this is not guaranteed. ^The
** first parameter, szPage, is the size in bytes of the pages that must
** be allocated by the cache.  ^szPage will not be a power of two.  ^szPage
** will the page size of the database file that is to be cached plus an
** increment (here called "R") of less than 250.  SQLite will use the
** extra R bytes on each page to store metadata about the underlying
** database page on disk.  The value of R depends
** on the SQLite version, the target platform, and how SQLite was compiled.
** ^(R is constant for a particular build of SQLite. Except, there are two
** distinct values of R when SQLite is compiled with the proprietary
** ZIPVFS extension.)^  ^The second argument to
** xCreate(), bPurgeable, is true if the cache being created will
** be used to cache database pages of a file stored on disk, or
** false if it is used for an in-memory database. The cache implementation
** does not have to do anything special based with the value of bPurgeable;
** it is purely advisory.  ^On a cache where bPurgeable is false, SQLite will
** never invoke xUnpin() except to deliberately delete a page.
** ^In other words, calls to xUnpin() on a cache with bPurgeable set to
** false will always have the "discard" flag set to true.  
** ^Hence, a cache created with bPurgeable false will
** never contain any unpinned pages.
**
** [[the xCachesize() page cache method]]
** ^(The xCachesize() method may be called at any time by SQLite to set the
** suggested maximum cache-size (number of pages stored by) the cache
** instance passed as the first argument. This is the value configured using
** the SQLite "[PRAGMA cache_size]" command.)^  As with the bPurgeable
** parameter, the implementation is not required to do anything with this
** value; it is advisory only.
**
** [[the xPagecount() page cache methods]]
** The xPagecount() method must return the number of pages currently
** stored in the cache, both pinned and unpinned.
** 
** [[the xFetch() page cache methods]]
** The xFetch() method locates a page in the cache and returns a pointer to 
** the page, or a NULL pointer.
** A "page", in this context, means a buffer of szPage bytes aligned at an
** 8-byte boundary. The page to be fetched is determined by the key. ^The
** minimum key value is 1.  After it has been retrieved using xFetch, the page 
** is considered to be "pinned".
**
** If the requested page is already in the page cache, then the page cache
** implementation must return a pointer to the page buffer with its content
** intact.  If the requested page is not already in the cache, then the
** cache implementation should use the value of the createFlag
** parameter to help it determined what action to take:
**
** <table border=1 width=85% align=center>
** <tr><th> createFlag <th> Behaviour when page is not already in cache
** <tr><td> 0 <td> Do not allocate a new page.  Return NULL.
** <tr><td> 1 <td> Allocate a new page if it easy and convenient to do so.
**                 Otherwise return NULL.
** <tr><td> 2 <td> Make every effort to allocate a new page.  Only return
**                 NULL if allocating a new page is effectively impossible.
** </table>
**
** ^(SQLite will normally invoke xFetch() with a createFlag of 0 or 1.  SQLite
** will only use a createFlag of 2 after a prior call with a createFlag of 1
** failed.)^  In between the to xFetch() calls, SQLite may
** attempt to unpin one or more cache pages by spilling the content of
** pinned pages to disk and synching the operating system disk cache.
**
** [[the xUnpin() page cache method]]
** ^xUnpin() is called by SQLite with a pointer to a currently pinned page
** as its second argument.  If the third parameter, discard, is non-zero,
** then the page must be evicted from the cache.
** ^If the discard parameter is
** zero, then the page may be discarded or retained at the discretion of
** page cache implementation. ^The page cache implementation
** may choose to evict unpinned pages at any time.
**
** The cache must not perform any reference counting. A single 
** call to xUnpin() unpins the page regardless of the number of prior calls 
** to xFetch().
**
** [[the xRekey() page cache methods]]
** The xRekey() method is used to change the key value associated with the
** page passed as the second argument. If the cache
** previously contains an entry associated with newKey, it must be
** discarded. ^Any prior cache entry associated with newKey is guaranteed not
** to be pinned.
**
** When SQLite calls the xTruncate() method, the cache must discard all
** existing cache entries with page numbers (keys) greater than or equal
** to the value of the iLimit parameter passed to xTruncate(). If any
** of these pages are pinned, they are implicitly unpinned, meaning that
** they can be safely discarded.
**
** [[the xDestroy() page cache method]]
** ^The xDestroy() method is used to delete a cache allocated by xCreate().
** All resources associated with the specified cache should be freed. ^After
** calling the xDestroy() method, SQLite considers the [sqlite3_pcache*]
** handle invalid, and will not use it with any other sqlite3_pcache_methods
** functions.
*/
typedef struct sqlite3_pcache_methods sqlite3_pcache_methods;
struct sqlite3_pcache_methods {
  void *pArg;
  int (*xInit)(void*);
  void (*xShutdown)(void*);
  sqlite3_pcache *(*xCreate)(int szPage, int bPurgeable);
  void (*xCachesize)(sqlite3_pcache*, int nCachesize);
  int (*xPagecount)(sqlite3_pcache*);
  void *(*xFetch)(sqlite3_pcache*, unsigned key, int createFlag);
  void (*xUnpin)(sqlite3_pcache*, void*, int discard);
  void (*xRekey)(sqlite3_pcache*, void*, unsigned oldKey, unsigned newKey);
  void (*xTruncate)(sqlite3_pcache*, unsigned iLimit);
  void (*xDestroy)(sqlite3_pcache*);
};

/*
** CAPI3REF: Online Backup Object
**
** The sqlite3_backup object records state information about an ongoing
** online backup operation.  ^The sqlite3_backup object is created by
** a call to [sqlite3_backup_init()] and is destroyed by a call to
** [sqlite3_backup_finish()].
**
** See Also: [Using the SQLite Online Backup API]
*/
typedef struct sqlite3_backup sqlite3_backup;

/*
** CAPI3REF: Online Backup API.
**
** The backup API copies the content of one database into another.
** It is useful either for creating backups of databases or
** for copying in-memory databases to or from persistent files. 
**
** See Also: [Using the SQLite Online Backup API]
**
** ^SQLite holds a write transaction open on the destination database file
** for the duration of the backup operation.
** ^The source database is read-locked only while it is being read;
** it is not locked continuously for the entire backup operation.
** ^Thus, the backup may be performed on a live source database without
** preventing other database connections from
** reading or writing to the source database while the backup is underway.
** 
** ^(To perform a backup operation: 
**   <ol>
**     <li><b>sqlite3_backup_init()</b> is called once to initialize the
**         backup, 
**     <li><b>sqlite3_backup_step()</b> is called one or more times to transfer 
**         the data between the two databases, and finally
**     <li><b>sqlite3_backup_finish()</b> is called to release all resources 
**         associated with the backup operation. 
**   </ol>)^
** There should be exactly one call to sqlite3_backup_finish() for each
** successful call to sqlite3_backup_init().
**
** [[sqlite3_backup_init()]] <b>sqlite3_backup_init()</b>
**
** ^The D and N arguments to sqlite3_backup_init(D,N,S,M) are the 
** [database connection] associated with the destination database 
** and the database name, respectively.
** ^The database name is "main" for the main database, "temp" for the
** temporary database, or the name specified after the AS keyword in
** an [ATTACH] statement for an attached database.
** ^The S and M arguments passed to 
** sqlite3_backup_init(D,N,S,M) identify the [database connection]
** and database name of the source database, respectively.
** ^The source and destination [database connections] (parameters S and D)
** must be different or else sqlite3_backup_init(D,N,S,M) will fail with
** an error.
**
** ^If an error occurs within sqlite3_backup_init(D,N,S,M), then NULL is
** returned and an error code and error message are stored in the
** destination [database connection] D.
** ^The error code and message for the failed call to sqlite3_backup_init()
** can be retrieved using the [sqlite3_errcode()], [sqlite3_errmsg()], and/or
** [sqlite3_errmsg16()] functions.
** ^A successful call to sqlite3_backup_init() returns a pointer to an
** [sqlite3_backup] object.
** ^The [sqlite3_backup] object may be used with the sqlite3_backup_step() and
** sqlite3_backup_finish() functions to perform the specified backup 
** operation.
**
** [[sqlite3_backup_step()]] <b>sqlite3_backup_step()</b>
**
** ^Function sqlite3_backup_step(B,N) will copy up to N pages between 
** the source and destination databases specified by [sqlite3_backup] object B.
** ^If N is negative, all remaining source pages are copied. 
** ^If sqlite3_backup_step(B,N) successfully copies N pages and there
** are still more pages to be copied, then the function returns [SQLITE_OK].
** ^If sqlite3_backup_step(B,N) successfully finishes copying all pages
** from source to destination, then it returns [SQLITE_DONE].
** ^If an error occurs while running sqlite3_backup_step(B,N),
** then an [error code] is returned. ^As well as [SQLITE_OK] and
** [SQLITE_DONE], a call to sqlite3_backup_step() may return [SQLITE_READONLY],
** [SQLITE_NOMEM], [SQLITE_BUSY], [SQLITE_LOCKED], or an
** [SQLITE_IOERR_ACCESS | SQLITE_IOERR_XXX] extended error code.
**
** ^(The sqlite3_backup_step() might return [SQLITE_READONLY] if
** <ol>
** <li> the destination database was opened read-only, or
** <li> the destination database is using write-ahead-log journaling
** and the destination and source page sizes differ, or
** <li> the destination database is an in-memory database and the
** destination and source page sizes differ.
** </ol>)^
**
** ^If sqlite3_backup_step() cannot obtain a required file-system lock, then
** the [sqlite3_busy_handler | busy-handler function]
** is invoked (if one is specified). ^If the 
** busy-handler returns non-zero before the lock is available, then 
** [SQLITE_BUSY] is returned to the caller. ^In this case the call to
** sqlite3_backup_step() can be retried later. ^If the source
** [database connection]
** is being used to write to the source database when sqlite3_backup_step()
** is called, then [SQLITE_LOCKED] is returned immediately. ^Again, in this
** case the call to sqlite3_backup_step() can be retried later on. ^(If
** [SQLITE_IOERR_ACCESS | SQLITE_IOERR_XXX], [SQLITE_NOMEM], or
** [SQLITE_READONLY] is returned, then 
** there is no point in retrying the call to sqlite3_backup_step(). These 
** errors are considered fatal.)^  The application must accept 
** that the backup operation has failed and pass the backup operation handle 
** to the sqlite3_backup_finish() to release associated resources.
**
** ^The first call to sqlite3_backup_step() obtains an exclusive lock
** on the destination file. ^The exclusive lock is not released until either 
** sqlite3_backup_finish() is called or the backup operation is complete 
** and sqlite3_backup_step() returns [SQLITE_DONE].  ^Every call to
** sqlite3_backup_step() obtains a [shared lock] on the source database that
** lasts for the duration of the sqlite3_backup_step() call.
** ^Because the source database is not locked between calls to
** sqlite3_backup_step(), the source database may be modified mid-way
** through the backup process.  ^If the source database is modified by an
** external process or via a database connection other than the one being
** used by the backup operation, then the backup will be automatically
** restarted by the next call to sqlite3_backup_step(). ^If the source 
** database is modified by the using the same database connection as is used
** by the backup operation, then the backup database is automatically
** updated at the same time.
**
** [[sqlite3_backup_finish()]] <b>sqlite3_backup_finish()</b>
**
** When sqlite3_backup_step() has returned [SQLITE_DONE], or when the 
** application wishes to abandon the backup operation, the application
** should destroy the [sqlite3_backup] by passing it to sqlite3_backup_finish().
** ^The sqlite3_backup_finish() interfaces releases all
** resources associated with the [sqlite3_backup] object. 
** ^If sqlite3_backup_step() has not yet returned [SQLITE_DONE], then any
** active write-transaction on the destination database is rolled back.
** The [sqlite3_backup] object is invalid
** and may not be used following a call to sqlite3_backup_finish().
**
** ^The value returned by sqlite3_backup_finish is [SQLITE_OK] if no
** sqlite3_backup_step() errors occurred, regardless or whether or not
** sqlite3_backup_step() completed.
** ^If an out-of-memory condition or IO error occurred during any prior
** sqlite3_backup_step() call on the same [sqlite3_backup] object, then
** sqlite3_backup_finish() returns the corresponding [error code].
**
** ^A return of [SQLITE_BUSY] or [SQLITE_LOCKED] from sqlite3_backup_step()
** is not a permanent error and does not affect the return value of
** sqlite3_backup_finish().
**
** [[sqlite3_backup__remaining()]] [[sqlite3_backup_pagecount()]]
** <b>sqlite3_backup_remaining() and sqlite3_backup_pagecount()</b>
**
** ^Each call to sqlite3_backup_step() sets two values inside
** the [sqlite3_backup] object: the number of pages still to be backed
** up and the total number of pages in the source database file.
** The sqlite3_backup_remaining() and sqlite3_backup_pagecount() interfaces
** retrieve these two values, respectively.
**
** ^The values returned by these functions are only updated by
** sqlite3_backup_step(). ^If the source database is modified during a backup
** operation, then the values are not updated to account for any extra
** pages that need to be updated or the size of the source database file
** changing.
**
** <b>Concurrent Usage of Database Handles</b>
**
** ^The source [database connection] may be used by the application for other
** purposes while a backup operation is underway or being initialized.
** ^If SQLite is compiled and configured to support threadsafe database
** connections, then the source database connection may be used concurrently
** from within other threads.
**
** However, the application must guarantee that the destination 
** [database connection] is not passed to any other API (by any thread) after 
** sqlite3_backup_init() is called and before the corresponding call to
** sqlite3_backup_finish().  SQLite does not currently check to see
** if the application incorrectly accesses the destination [database connection]
** and so no error code is reported, but the operations may malfunction
** nevertheless.  Use of the destination database connection while a
** backup is in progress might also also cause a mutex deadlock.
**
** If running in [shared cache mode], the application must
** guarantee that the shared cache used by the destination database
** is not accessed while the backup is running. In practice this means
** that the application must guarantee that the disk file being 
** backed up to is not accessed by any connection within the process,
** not just the specific connection that was passed to sqlite3_backup_init().
**
** The [sqlite3_backup] object itself is partially threadsafe. Multiple 
** threads may safely make multiple concurrent calls to sqlite3_backup_step().
** However, the sqlite3_backup_remaining() and sqlite3_backup_pagecount()
** APIs are not strictly speaking threadsafe. If they are invoked at the
** same time as another thread is invoking sqlite3_backup_step() it is
** possible that they return invalid values.
*/
SQLITE_API sqlite3_backup *sqlite3_backup_init(
  sqlite3 *pDest,                        /* Destination database handle */
  const char *zDestName,                 /* Destination database name */
  sqlite3 *pSource,                      /* Source database handle */
  const char *zSourceName                /* Source database name */
);
SQLITE_API int sqlite3_backup_step(sqlite3_backup *p, int nPage);
SQLITE_API int sqlite3_backup_finish(sqlite3_backup *p);
SQLITE_API int sqlite3_backup_remaining(sqlite3_backup *p);
SQLITE_API int sqlite3_backup_pagecount(sqlite3_backup *p);

/*
** CAPI3REF: Unlock Notification
**
** ^When running in shared-cache mode, a database operation may fail with
** an [SQLITE_LOCKED] error if the required locks on the shared-cache or
** individual tables within the shared-cache cannot be obtained. See
** [SQLite Shared-Cache Mode] for a description of shared-cache locking. 
** ^This API may be used to register a callback that SQLite will invoke 
** when the connection currently holding the required lock relinquishes it.
** ^This API is only available if the library was compiled with the
** [SQLITE_ENABLE_UNLOCK_NOTIFY] C-preprocessor symbol defined.
**
** See Also: [Using the SQLite Unlock Notification Feature].
**
** ^Shared-cache locks are released when a database connection concludes
** its current transaction, either by committing it or rolling it back. 
**
** ^When a connection (known as the blocked connection) fails to obtain a
** shared-cache lock and SQLITE_LOCKED is returned to the caller, the
** identity of the database connection (the blocking connection) that
** has locked the required resource is stored internally. ^After an 
** application receives an SQLITE_LOCKED error, it may call the
** sqlite3_unlock_notify() method with the blocked connection handle as 
** the first argument to register for a callback that will be invoked
** when the blocking connections current transaction is concluded. ^The
** callback is invoked from within the [sqlite3_step] or [sqlite3_close]
** call that concludes the blocking connections transaction.
**
** ^(If sqlite3_unlock_notify() is called in a multi-threaded application,
** there is a chance that the blocking connection will have already
** concluded its transaction by the time sqlite3_unlock_notify() is invoked.
** If this happens, then the specified callback is invoked immediately,
** from within the call to sqlite3_unlock_notify().)^
**
** ^If the blocked connection is attempting to obtain a write-lock on a
** shared-cache table, and more than one other connection currently holds
** a read-lock on the same table, then SQLite arbitrarily selects one of 
** the other connections to use as the blocking connection.
**
** ^(There may be at most one unlock-notify callback registered by a 
** blocked connection. If sqlite3_unlock_notify() is called when the
** blocked connection already has a registered unlock-notify callback,
** then the new callback replaces the old.)^ ^If sqlite3_unlock_notify() is
** called with a NULL pointer as its second argument, then any existing
** unlock-notify callback is canceled. ^The blocked connections 
** unlock-notify callback may also be canceled by closing the blocked
** connection using [sqlite3_close()].
**
** The unlock-notify callback is not reentrant. If an application invokes
** any sqlite3_xxx API functions from within an unlock-notify callback, a
** crash or deadlock may be the result.
**
** ^Unless deadlock is detected (see below), sqlite3_unlock_notify() always
** returns SQLITE_OK.
**
** <b>Callback Invocation Details</b>
**
** When an unlock-notify callback is registered, the application provides a 
** single void* pointer that is passed to the callback when it is invoked.
** However, the signature of the callback function allows SQLite to pass
** it an array of void* context pointers. The first argument passed to
** an unlock-notify callback is a pointer to an array of void* pointers,
** and the second is the number of entries in the array.
**
** When a blocking connections transaction is concluded, there may be
** more than one blocked connection that has registered for an unlock-notify
** callback. ^If two or more such blocked connections have specified the
** same callback function, then instead of invoking the callback function
** multiple times, it is invoked once with the set of void* context pointers
** specified by the blocked connections bundled together into an array.
** This gives the application an opportunity to prioritize any actions 
** related to the set of unblocked database connections.
**
** <b>Deadlock Detection</b>
**
** Assuming that after registering for an unlock-notify callback a 
** database waits for the callback to be issued before taking any further
** action (a reasonable assumption), then using this API may cause the
** application to deadlock. For example, if connection X is waiting for
** connection Y's transaction to be concluded, and similarly connection
** Y is waiting on connection X's transaction, then neither connection
** will proceed and the system may remain deadlocked indefinitely.
**
** To avoid this scenario, the sqlite3_unlock_notify() performs deadlock
** detection. ^If a given call to sqlite3_unlock_notify() would put the
** system in a deadlocked state, then SQLITE_LOCKED is returned and no
** unlock-notify callback is registered. The system is said to be in
** a deadlocked state if connection A has registered for an unlock-notify
** callback on the conclusion of connection B's transaction, and connection
** B has itself registered for an unlock-notify callback when connection
** A's transaction is concluded. ^Indirect deadlock is also detected, so
** the system is also considered to be deadlocked if connection B has
** registered for an unlock-notify callback on the conclusion of connection
** C's transaction, where connection C is waiting on connection A. ^Any
** number of levels of indirection are allowed.
**
** <b>The "DROP TABLE" Exception</b>
**
** When a call to [sqlite3_step()] returns SQLITE_LOCKED, it is almost 
** always appropriate to call sqlite3_unlock_notify(). There is however,
** one exception. When executing a "DROP TABLE" or "DROP INDEX" statement,
** SQLite checks if there are any currently executing SELECT statements
** that belong to the same connection. If there are, SQLITE_LOCKED is
** returned. In this case there is no "blocking connection", so invoking
** sqlite3_unlock_notify() results in the unlock-notify callback being
** invoked immediately. If the application then re-attempts the "DROP TABLE"
** or "DROP INDEX" query, an infinite loop might be the result.
**
** One way around this problem is to check the extended error code returned
** by an sqlite3_step() call. ^(If there is a blocking connection, then the
** extended error code is set to SQLITE_LOCKED_SHAREDCACHE. Otherwise, in
** the special "DROP TABLE/INDEX" case, the extended error code is just 
** SQLITE_LOCKED.)^
*/
SQLITE_API int sqlite3_unlock_notify(
  sqlite3 *pBlocked,                          /* Waiting connection */
  void (*xNotify)(void **apArg, int nArg),    /* Callback function to invoke */
  void *pNotifyArg                            /* Argument to pass to xNotify */
);


/*
** CAPI3REF: String Comparison
**
** ^The [sqlite3_strnicmp()] API allows applications and extensions to
** compare the contents of two buffers containing UTF-8 strings in a
** case-independent fashion, using the same definition of case independence 
** that SQLite uses internally when comparing identifiers.
*/
SQLITE_API int sqlite3_strnicmp(const char *, const char *, int);

/*
** CAPI3REF: Error Logging Interface
**
** ^The [sqlite3_log()] interface writes a message into the error log
** established by the [SQLITE_CONFIG_LOG] option to [sqlite3_config()].
** ^If logging is enabled, the zFormat string and subsequent arguments are
** used with [sqlite3_snprintf()] to generate the final output string.
**
** The sqlite3_log() interface is intended for use by extensions such as
** virtual tables, collating functions, and SQL functions.  While there is
** nothing to prevent an application from calling sqlite3_log(), doing so
** is considered bad form.
**
** The zFormat string must not be NULL.
**
** To avoid deadlocks and other threading problems, the sqlite3_log() routine
** will not use dynamically allocated memory.  The log message is stored in
** a fixed-length buffer on the stack.  If the log message is longer than
** a few hundred characters, it will be truncated to the length of the
** buffer.
*/
SQLITE_API void sqlite3_log(int iErrCode, const char *zFormat, ...);

/*
** CAPI3REF: Write-Ahead Log Commit Hook
**
** ^The [sqlite3_wal_hook()] function is used to register a callback that
** will be invoked each time a database connection commits data to a
** [write-ahead log] (i.e. whenever a transaction is committed in
** [journal_mode | journal_mode=WAL mode]). 
**
** ^The callback is invoked by SQLite after the commit has taken place and 
** the associated write-lock on the database released, so the implementation 
** may read, write or [checkpoint] the database as required.
**
** ^The first parameter passed to the callback function when it is invoked
** is a copy of the third parameter passed to sqlite3_wal_hook() when
** registering the callback. ^The second is a copy of the database handle.
** ^The third parameter is the name of the database that was written to -
** either "main" or the name of an [ATTACH]-ed database. ^The fourth parameter
** is the number of pages currently in the write-ahead log file,
** including those that were just committed.
**
** The callback function should normally return [SQLITE_OK].  ^If an error
** code is returned, that error will propagate back up through the
** SQLite code base to cause the statement that provoked the callback
** to report an error, though the commit will have still occurred. If the
** callback returns [SQLITE_ROW] or [SQLITE_DONE], or if it returns a value
** that does not correspond to any valid SQLite error code, the results
** are undefined.
**
** A single database handle may have at most a single write-ahead log callback 
** registered at one time. ^Calling [sqlite3_wal_hook()] replaces any
** previously registered write-ahead log callback. ^Note that the
** [sqlite3_wal_autocheckpoint()] interface and the
** [wal_autocheckpoint pragma] both invoke [sqlite3_wal_hook()] and will
** those overwrite any prior [sqlite3_wal_hook()] settings.
*/
SQLITE_API void *sqlite3_wal_hook(
  sqlite3*, 
  int(*)(void *,sqlite3*,const char*,int),
  void*
);

/*
** CAPI3REF: Configure an auto-checkpoint
**
** ^The [sqlite3_wal_autocheckpoint(D,N)] is a wrapper around
** [sqlite3_wal_hook()] that causes any database on [database connection] D
** to automatically [checkpoint]
** after committing a transaction if there are N or
** more frames in the [write-ahead log] file.  ^Passing zero or 
** a negative value as the nFrame parameter disables automatic
** checkpoints entirely.
**
** ^The callback registered by this function replaces any existing callback
** registered using [sqlite3_wal_hook()].  ^Likewise, registering a callback
** using [sqlite3_wal_hook()] disables the automatic checkpoint mechanism
** configured by this function.
**
** ^The [wal_autocheckpoint pragma] can be used to invoke this interface
** from SQL.
**
** ^Every new [database connection] defaults to having the auto-checkpoint
** enabled with a threshold of 1000 or [SQLITE_DEFAULT_WAL_AUTOCHECKPOINT]
** pages.  The use of this interface
** is only necessary if the default setting is found to be suboptimal
** for a particular application.
*/
SQLITE_API int sqlite3_wal_autocheckpoint(sqlite3 *db, int N);

/*
** CAPI3REF: Checkpoint a database
**
** ^The [sqlite3_wal_checkpoint(D,X)] interface causes database named X
** on [database connection] D to be [checkpointed].  ^If X is NULL or an
** empty string, then a checkpoint is run on all databases of
** connection D.  ^If the database connection D is not in
** [WAL | write-ahead log mode] then this interface is a harmless no-op.
**
** ^The [wal_checkpoint pragma] can be used to invoke this interface
** from SQL.  ^The [sqlite3_wal_autocheckpoint()] interface and the
** [wal_autocheckpoint pragma] can be used to cause this interface to be
** run whenever the WAL reaches a certain size threshold.
**
** See also: [sqlite3_wal_checkpoint_v2()]
*/
SQLITE_API int sqlite3_wal_checkpoint(sqlite3 *db, const char *zDb);

/*
** CAPI3REF: Checkpoint a database
**
** Run a checkpoint operation on WAL database zDb attached to database 
** handle db. The specific operation is determined by the value of the 
** eMode parameter:
**
** <dl>
** <dt>SQLITE_CHECKPOINT_PASSIVE<dd>
**   Checkpoint as many frames as possible without waiting for any database 
**   readers or writers to finish. Sync the db file if all frames in the log
**   are checkpointed. This mode is the same as calling 
**   sqlite3_wal_checkpoint(). The busy-handler callback is never invoked.
**
** <dt>SQLITE_CHECKPOINT_FULL<dd>
**   This mode blocks (calls the busy-handler callback) until there is no
**   database writer and all readers are reading from the most recent database
**   snapshot. It then checkpoints all frames in the log file and syncs the
**   database file. This call blocks database writers while it is running,
**   but not database readers.
**
** <dt>SQLITE_CHECKPOINT_RESTART<dd>
**   This mode works the same way as SQLITE_CHECKPOINT_FULL, except after 
**   checkpointing the log file it blocks (calls the busy-handler callback)
**   until all readers are reading from the database file only. This ensures 
**   that the next client to write to the database file restarts the log file 
**   from the beginning. This call blocks database writers while it is running,
**   but not database readers.
** </dl>
**
** If pnLog is not NULL, then *pnLog is set to the total number of frames in
** the log file before returning. If pnCkpt is not NULL, then *pnCkpt is set to
** the total number of checkpointed frames (including any that were already
** checkpointed when this function is called). *pnLog and *pnCkpt may be
** populated even if sqlite3_wal_checkpoint_v2() returns other than SQLITE_OK.
** If no values are available because of an error, they are both set to -1
** before returning to communicate this to the caller.
**
** All calls obtain an exclusive "checkpoint" lock on the database file. If
** any other process is running a checkpoint operation at the same time, the 
** lock cannot be obtained and SQLITE_BUSY is returned. Even if there is a 
** busy-handler configured, it will not be invoked in this case.
**
** The SQLITE_CHECKPOINT_FULL and RESTART modes also obtain the exclusive 
** "writer" lock on the database file. If the writer lock cannot be obtained
** immediately, and a busy-handler is configured, it is invoked and the writer
** lock retried until either the busy-handler returns 0 or the lock is
** successfully obtained. The busy-handler is also invoked while waiting for
** database readers as described above. If the busy-handler returns 0 before
** the writer lock is obtained or while waiting for database readers, the
** checkpoint operation proceeds from that point in the same way as 
** SQLITE_CHECKPOINT_PASSIVE - checkpointing as many frames as possible 
** without blocking any further. SQLITE_BUSY is returned in this case.
**
** If parameter zDb is NULL or points to a zero length string, then the
** specified operation is attempted on all WAL databases. In this case the
** values written to output parameters *pnLog and *pnCkpt are undefined. If 
** an SQLITE_BUSY error is encountered when processing one or more of the 
** attached WAL databases, the operation is still attempted on any remaining 
** attached databases and SQLITE_BUSY is returned to the caller. If any other 
** error occurs while processing an attached database, processing is abandoned 
** and the error code returned to the caller immediately. If no error 
** (SQLITE_BUSY or otherwise) is encountered while processing the attached 
** databases, SQLITE_OK is returned.
**
** If database zDb is the name of an attached database that is not in WAL
** mode, SQLITE_OK is returned and both *pnLog and *pnCkpt set to -1. If
** zDb is not NULL (or a zero length string) and is not the name of any
** attached database, SQLITE_ERROR is returned to the caller.
*/
SQLITE_API int sqlite3_wal_checkpoint_v2(
  sqlite3 *db,                    /* Database handle */
  const char *zDb,                /* Name of attached database (or NULL) */
  int eMode,                      /* SQLITE_CHECKPOINT_* value */
  int *pnLog,                     /* OUT: Size of WAL log in frames */
  int *pnCkpt                     /* OUT: Total number of frames checkpointed */
);

/*
** CAPI3REF: Checkpoint operation parameters
**
** These constants can be used as the 3rd parameter to
** [sqlite3_wal_checkpoint_v2()].  See the [sqlite3_wal_checkpoint_v2()]
** documentation for additional information about the meaning and use of
** each of these values.
*/
#define SQLITE_CHECKPOINT_PASSIVE 0
#define SQLITE_CHECKPOINT_FULL    1
#define SQLITE_CHECKPOINT_RESTART 2

/*
** CAPI3REF: Virtual Table Interface Configuration
**
** This function may be called by either the [xConnect] or [xCreate] method
** of a [virtual table] implementation to configure
** various facets of the virtual table interface.
**
** If this interface is invoked outside the context of an xConnect or
** xCreate virtual table method then the behavior is undefined.
**
** At present, there is only one option that may be configured using
** this function. (See [SQLITE_VTAB_CONSTRAINT_SUPPORT].)  Further options
** may be added in the future.
*/
SQLITE_API int sqlite3_vtab_config(sqlite3*, int op, ...);

/*
** CAPI3REF: Virtual Table Configuration Options
**
** These macros define the various options to the
** [sqlite3_vtab_config()] interface that [virtual table] implementations
** can use to customize and optimize their behavior.
**
** <dl>
** <dt>SQLITE_VTAB_CONSTRAINT_SUPPORT
** <dd>Calls of the form
** [sqlite3_vtab_config](db,SQLITE_VTAB_CONSTRAINT_SUPPORT,X) are supported,
** where X is an integer.  If X is zero, then the [virtual table] whose
** [xCreate] or [xConnect] method invoked [sqlite3_vtab_config()] does not
** support constraints.  In this configuration (which is the default) if
** a call to the [xUpdate] method returns [SQLITE_CONSTRAINT], then the entire
** statement is rolled back as if [ON CONFLICT | OR ABORT] had been
** specified as part of the users SQL statement, regardless of the actual
** ON CONFLICT mode specified.
**
** If X is non-zero, then the virtual table implementation guarantees
** that if [xUpdate] returns [SQLITE_CONSTRAINT], it will do so before
** any modifications to internal or persistent data structures have been made.
** If the [ON CONFLICT] mode is ABORT, FAIL, IGNORE or ROLLBACK, SQLite 
** is able to roll back a statement or database transaction, and abandon
** or continue processing the current SQL statement as appropriate. 
** If the ON CONFLICT mode is REPLACE and the [xUpdate] method returns
** [SQLITE_CONSTRAINT], SQLite handles this as if the ON CONFLICT mode
** had been ABORT.
**
** Virtual table implementations that are required to handle OR REPLACE
** must do so within the [xUpdate] method. If a call to the 
** [sqlite3_vtab_on_conflict()] function indicates that the current ON 
** CONFLICT policy is REPLACE, the virtual table implementation should 
** silently replace the appropriate rows within the xUpdate callback and
** return SQLITE_OK. Or, if this is not possible, it may return
** SQLITE_CONSTRAINT, in which case SQLite falls back to OR ABORT 
** constraint handling.
** </dl>
*/
#define SQLITE_VTAB_CONSTRAINT_SUPPORT 1

/*
** CAPI3REF: Determine The Virtual Table Conflict Policy
**
** This function may only be called from within a call to the [xUpdate] method
** of a [virtual table] implementation for an INSERT or UPDATE operation. ^The
** value returned is one of [SQLITE_ROLLBACK], [SQLITE_IGNORE], [SQLITE_FAIL],
** [SQLITE_ABORT], or [SQLITE_REPLACE], according to the [ON CONFLICT] mode
** of the SQL statement that triggered the call to the [xUpdate] method of the
** [virtual table].
*/
SQLITE_API int sqlite3_vtab_on_conflict(sqlite3 *);

/*
** CAPI3REF: Conflict resolution modes
**
** These constants are returned by [sqlite3_vtab_on_conflict()] to
** inform a [virtual table] implementation what the [ON CONFLICT] mode
** is for the SQL statement being evaluated.
**
** Note that the [SQLITE_IGNORE] constant is also used as a potential
** return value from the [sqlite3_set_authorizer()] callback and that
** [SQLITE_ABORT] is also a [result code].
*/
#define SQLITE_ROLLBACK 1
/* #define SQLITE_IGNORE 2 // Also used by sqlite3_authorizer() callback */
#define SQLITE_FAIL     3
/* #define SQLITE_ABORT 4  // Also an error code */
#define SQLITE_REPLACE  5



/*
** Undo the hack that converts floating point types to integer for
** builds on processors without floating point support.
*/
#ifdef SQLITE_OMIT_FLOATING_POINT
# undef double
#endif

#ifdef __cplusplus
}  /* End of the 'extern "C"' block */
#endif
#endif

/*
** 2010 August 30
**
** The author disclaims copyright to this source code.  In place of
** a legal notice, here is a blessing:
**
**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
*/

#ifndef _SQLITE3RTREE_H_
#define _SQLITE3RTREE_H_


#ifdef __cplusplus
extern "C" {
#endif

typedef struct sqlite3_rtree_geometry sqlite3_rtree_geometry;

/*
** Register a geometry callback named zGeom that can be used as part of an
** R-Tree geometry query as follows:
**
**   SELECT ... FROM <rtree> WHERE <rtree col> MATCH $zGeom(... params ...)
*/
SQLITE_API int sqlite3_rtree_geometry_callback(
  sqlite3 *db,
  const char *zGeom,
  int (*xGeom)(sqlite3_rtree_geometry *, int nCoord, double *aCoord, int *pRes),
  void *pContext
);


/*
** A pointer to a structure of the following type is passed as the first
** argument to callbacks registered using rtree_geometry_callback().
*/
struct sqlite3_rtree_geometry {
  void *pContext;                 /* Copy of pContext passed to s_r_g_c() */
  int nParam;                     /* Size of array aParam[] */
  double *aParam;                 /* Parameters passed to SQL geom function */
  void *pUser;                    /* Callback implementation user data */
  void (*xDelUser)(void *);       /* Called by SQLite to clean up pUser */
};


#ifdef __cplusplus
}  /* end of the 'extern "C"' block */
#endif

#endif  /* ifndef _SQLITE3RTREE_H_ */