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path: root/src/lua/CMakeLists.txt
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#
# Lua 5.1.x
#
cmake_minimum_required(VERSION 2.4 FATAL_ERROR)

project(lua C)

set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)

set(COMMON_CFLAGS)
set(COMMON_LDFLAGS)
set(LIBS)

if(APPLE)
	set(DEFAULT_POSIX TRUE)
	set(DEFAULT_DLOPEN ON)
	# use this on Mac OS X 10.3-
	option(LUA_USE_MACOSX "Mac OS X 10.3-" OFF)
elseif(CYGWIN)
	set(DEFAULT_POSIX TRUE)
elseif(UNIX)
	set(DEFAULT_POSIX TRUE)
elseif(WIN32)
	set(LUA_WIN TRUE)
	set(COMMON_CFLAGS "${COMMON_CFLAGS} -DLUA_BUILD_AS_DLL")
else()
	set(DEFAULT_ANSI TRUE)
endif()

if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
	set(COMMON_LDFLAGS "${COMMON_LDFLAGS} -Wl,-E -lm")
	set(DEFAULT_DLOPEN ON)
endif()

if(WIN32)
	#set(BUILD_STATIC OFF)
	set(BUILD_STATIC ON)
else()
	#option(BUILD_STATIC "build static library" ON)
	set(BUILD_STATIC ON)
endif()

if(DEFAULT_DLOPEN)
	option(LUA_USE_DLOPEN "Enable dlopen support." ON)
else()
	option(LUA_USE_DLOPEN "Enable dlopen support." OFF)
endif()
mark_as_advanced(LUA_USE_DLOPEN)

if(DEFAULT_POSIX)
else()
endif()

if(DEFAULT_ANSI)
	option(LUA_ANSI "Disable non-ansi features." ON)
else()
	option(LUA_ANSI "Disable non-ansi features." OFF)
endif()
mark_as_advanced(LUA_ANSI)

#
# Lua version
#
set(LUA_VERSION_MAJOR 5)
set(LUA_VERSION_MINOR 1)
set(LUA_VERSION_PATCH 4)
set(LUA_VERSION
				"${LUA_VERSION_MAJOR}.${LUA_VERSION_MINOR}.${LUA_VERSION_PATCH}")
set(LUA_SOVERSION
				"${LUA_VERSION_MAJOR}")

#
# libs & cflags
#
set(COMMON_LDFLAGS "${COMMON_LDFLAGS}")

# For "Mac OS X 10.3-"
if(LUA_USE_MACOSX)
	set(COMMON_CFLAGS "${COMMON_CFLAGS} -DLUA_USE_MACOSX")
	set(LUA_USE_DLOPEN FALSE)
endif(LUA_USE_MACOSX)

if(LUA_USE_DLOPEN)
	set(COMMON_CFLAGS "${COMMON_CFLAGS} -DLUA_USE_DLOPEN")
	if(NOT APPLE)
		set(COMMON_LDFLAGS "${COMMON_LDFLAGS} -ldl ")
	endif(NOT APPLE)
endif(LUA_USE_DLOPEN)

if(LUA_ANSI)
	set(COMMON_CFLAGS "${COMMON_CFLAGS} -DLUA_ANSI")
endif(LUA_ANSI)

#
# COMMON_CFLAGS has no effect without this line
#
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${COMMON_CFLAGS}")

#
# standard flags to use for each build type.
#
if(CMAKE_COMPILER_IS_GNUCC)
	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -pipe -Wall -Wextra -Wshadow -W -pedantic -std=gnu99")
	set(CMAKE_C_FLAGS_RELEASE        "${CMAKE_C_FLAGS_RELEASE}     -O2")
	set(CMAKE_C_FLAGS_DEBUG          "${CMAKE_C_FLAGS_DEBUG}       -O0 -g")
	set(CMAKE_C_FLAGS_PROFILE        "${CMAKE_C_FLAGS_PROFILE}     -O1 -g")
	set(CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_WITHDEBINFO} -O2 -g")
endif(CMAKE_COMPILER_IS_GNUCC)

#
# sub-folders
#
ADD_SUBDIRECTORY(src build)

#n205'>205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255
/*
Minetest
Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include "numeric.h"
#include "mathconstants.h"

#include "log.h"
#include "../constants.h" // BS, MAP_BLOCKSIZE
#include "../noise.h" // PseudoRandom, PcgRandom
#include "../threading/mutex_auto_lock.h"
#include <string.h>
#include <iostream>

UNORDERED_MAP<u16, std::vector<v3s16> > FacePositionCache::m_cache;
Mutex FacePositionCache::m_cache_mutex;
// Calculate the borders of a "d-radius" cube
// TODO: Make it work without mutex and data races, probably thread-local
std::vector<v3s16> FacePositionCache::getFacePositions(u16 d)
{
	MutexAutoLock cachelock(m_cache_mutex);
	if (m_cache.find(d) != m_cache.end())
		return m_cache[d];

	generateFacePosition(d);
	return m_cache[d];

}

void FacePositionCache::generateFacePosition(u16 d)
{
	m_cache[d] = std::vector<v3s16>();
	if(d == 0) {
		m_cache[d].push_back(v3s16(0,0,0));
		return;
	}
	if(d == 1) {
		/*
			This is an optimized sequence of coordinates.
		*/
		m_cache[d].push_back(v3s16( 0, 1, 0)); // top
		m_cache[d].push_back(v3s16( 0, 0, 1)); // back
		m_cache[d].push_back(v3s16(-1, 0, 0)); // left
		m_cache[d].push_back(v3s16( 1, 0, 0)); // right
		m_cache[d].push_back(v3s16( 0, 0,-1)); // front
		m_cache[d].push_back(v3s16( 0,-1, 0)); // bottom
		// 6
		m_cache[d].push_back(v3s16(-1, 0, 1)); // back left
		m_cache[d].push_back(v3s16( 1, 0, 1)); // back right
		m_cache[d].push_back(v3s16(-1, 0,-1)); // front left
		m_cache[d].push_back(v3s16( 1, 0,-1)); // front right
		m_cache[d].push_back(v3s16(-1,-1, 0)); // bottom left
		m_cache[d].push_back(v3s16( 1,-1, 0)); // bottom right
		m_cache[d].push_back(v3s16( 0,-1, 1)); // bottom back
		m_cache[d].push_back(v3s16( 0,-1,-1)); // bottom front
		m_cache[d].push_back(v3s16(-1, 1, 0)); // top left
		m_cache[d].push_back(v3s16( 1, 1, 0)); // top right
		m_cache[d].push_back(v3s16( 0, 1, 1)); // top back
		m_cache[d].push_back(v3s16( 0, 1,-1)); // top front
		// 18
		m_cache[d].push_back(v3s16(-1, 1, 1)); // top back-left
		m_cache[d].push_back(v3s16( 1, 1, 1)); // top back-right
		m_cache[d].push_back(v3s16(-1, 1,-1)); // top front-left
		m_cache[d].push_back(v3s16( 1, 1,-1)); // top front-right
		m_cache[d].push_back(v3s16(-1,-1, 1)); // bottom back-left
		m_cache[d].push_back(v3s16( 1,-1, 1)); // bottom back-right
		m_cache[d].push_back(v3s16(-1,-1,-1)); // bottom front-left
		m_cache[d].push_back(v3s16( 1,-1,-1)); // bottom front-right
		// 26
		return;
	}

	// Take blocks in all sides, starting from y=0 and going +-y
	for(s16 y=0; y<=d-1; y++) {
		// Left and right side, including borders
		for(s16 z=-d; z<=d; z++) {
			m_cache[d].push_back(v3s16(d,y,z));
			m_cache[d].push_back(v3s16(-d,y,z));
			if(y != 0) {
				m_cache[d].push_back(v3s16(d,-y,z));
				m_cache[d].push_back(v3s16(-d,-y,z));
			}
		}
		// Back and front side, excluding borders
		for(s16 x=-d+1; x<=d-1; x++) {
			m_cache[d].push_back(v3s16(x,y,d));
			m_cache[d].push_back(v3s16(x,y,-d));
			if(y != 0) {
				m_cache[d].push_back(v3s16(x,-y,d));
				m_cache[d].push_back(v3s16(x,-y,-d));
			}
		}
	}

	// Take the bottom and top face with borders
	// -d<x<d, y=+-d, -d<z<d
	for(s16 x=-d; x<=d; x++)
	for(s16 z=-d; z<=d; z++) {
		m_cache[d].push_back(v3s16(x,-d,z));
		m_cache[d].push_back(v3s16(x,d,z));
	}
}

/*
    myrand
*/

PcgRandom g_pcgrand;

u32 myrand()
{
	return g_pcgrand.next();
}

void mysrand(unsigned int seed)
{
	g_pcgrand.seed(seed);
}

void myrand_bytes(void *out, size_t len)
{
	g_pcgrand.bytes(out, len);
}

int myrand_range(int min, int max)
{
	return g_pcgrand.range(min, max);
}


/*
	64-bit unaligned version of MurmurHash
*/
u64 murmur_hash_64_ua(const void *key, int len, unsigned int seed)
{
	const u64 m = 0xc6a4a7935bd1e995ULL;
	const int r = 47;
	u64 h = seed ^ (len * m);

	const u64 *data = (const u64 *)key;
	const u64 *end = data + (len / 8);

	while (data != end) {
		u64 k;
		memcpy(&k, data, sizeof(u64));
		data++;

		k *= m;
		k ^= k >> r;
		k *= m;

		h ^= k;
		h *= m;
	}

	const unsigned char *data2 = (const unsigned char *)data;
	switch (len & 7) {
		case 7: h ^= (u64)data2[6] << 48;
		case 6: h ^= (u64)data2[5] << 40;
		case 5: h ^= (u64)data2[4] << 32;
		case 4: h ^= (u64)data2[3] << 24;
		case 3: h ^= (u64)data2[2] << 16;
		case 2: h ^= (u64)data2[1] << 8;
		case 1: h ^= (u64)data2[0];
				h *= m;
	}

	h ^= h >> r;
	h *= m;
	h ^= h >> r;

	return h;
}

/*
	blockpos_b: position of block in block coordinates
	camera_pos: position of camera in nodes
	camera_dir: an unit vector pointing to camera direction
	range: viewing range
	distance_ptr: return location for distance from the camera
*/
bool isBlockInSight(v3s16 blockpos_b, v3f camera_pos, v3f camera_dir,
		f32 camera_fov, f32 range, f32 *distance_ptr)
{
	// Maximum radius of a block.  The magic number is
	// sqrt(3.0) / 2.0 in literal form.
	const f32 block_max_radius = 0.866025403784 * MAP_BLOCKSIZE * BS;

	v3s16 blockpos_nodes = blockpos_b * MAP_BLOCKSIZE;

	// Block center position
	v3f blockpos(
			((float)blockpos_nodes.X + MAP_BLOCKSIZE/2) * BS,
			((float)blockpos_nodes.Y + MAP_BLOCKSIZE/2) * BS,
			((float)blockpos_nodes.Z + MAP_BLOCKSIZE/2) * BS
	);

	// Block position relative to camera
	v3f blockpos_relative = blockpos - camera_pos;

	// Total distance
	f32 d = MYMAX(0, blockpos_relative.getLength() - block_max_radius);

	if(distance_ptr)
		*distance_ptr = d;

	// If block is far away, it's not in sight
	if(d > range)
		return false;

	// If block is (nearly) touching the camera, don't
	// bother validating further (that is, render it anyway)
	if(d == 0)
		return true;