src/script/lua_api/l_mapgen.cpp


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/*
Minetest
Copyright (C) 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 "lua_api/l_mapgen.h"
#include "lua_api/l_internal.h"
#include "lua_api/l_vmanip.h"
#include "common/c_converter.h"
#include "common/c_content.h"
#include "cpp_api/s_security.h"
#include "util/serialize.h"
#include "server.h"
#include "environment.h"
#include "emerge.h"
#include "mapgen/mg_biome.h"
#include "mapgen/mg_ore.h"
#include "mapgen/mg_decoration.h"
#include "mapgen/mg_schematic.h"
#include "mapgen/mapgen_v5.h"
#include "mapgen/mapgen_v7.h"
#include "filesys.h"
#include "settings.h"
#include "log.h"

struct EnumString ModApiMapgen::es_BiomeTerrainType[] =
{
	{BIOMETYPE_NORMAL, "normal"},
	{0, NULL},
};

struct EnumString ModApiMapgen::es_DecorationType[] =
{
	{DECO_SIMPLE,    "simple"},
	{DECO_SCHEMATIC, "schematic"},
	{DECO_LSYSTEM,   "lsystem"},
	{0, NULL},
};

struct EnumString ModApiMapgen::es_MapgenObject[] =
{
	{MGOBJ_VMANIP,    "voxelmanip"},
	{MGOBJ_HEIGHTMAP, "heightmap"},
	{MGOBJ_BIOMEMAP,  "biomemap"},
	{MGOBJ_HEATMAP,   "heatmap"},
	{MGOBJ_HUMIDMAP,  "humiditymap"},
	{MGOBJ_GENNOTIFY, "gennotify"},
	{0, NULL},
};

struct EnumString ModApiMapgen::es_OreType[] =
{
	{ORE_SCATTER, "scatter"},
	{ORE_SHEET,   "sheet"},
	{ORE_PUFF,    "puff"},
	{ORE_BLOB,    "blob"},
	{ORE_VEIN,    "vein"},
	{ORE_STRATUM, "stratum"},
	{0, NULL},
};

struct EnumString ModApiMapgen::es_Rotation[] =
{
	{ROTATE_0,    "0"},
	{ROTATE_90,   "90"},
	{ROTATE_180,  "180"},
	{ROTATE_270,  "270"},
	{ROTATE_RAND, "random"},
	{0, NULL},
};

struct EnumString ModApiMapgen::es_SchematicFormatType[] =
{
	{SCHEM_FMT_HANDLE, "handle"},
	{SCHEM_FMT_MTS,    "mts"},
	{SCHEM_FMT_LUA,    "lua"},
	{0, NULL},
};

ObjDef *get_objdef(lua_State *L, int index, ObjDefManager *objmgr);

Biome *get_or_load_biome(lua_State *L, int index,
	BiomeManager *biomemgr);
Biome *read_biome_def(lua_State *L, int index, const NodeDefManager *ndef);
size_t get_biome_list(lua_State *L, int index,
	BiomeManager *biomemgr, std::unordered_set<u8> *biome_id_list);

Schematic *get_or_load_schematic(lua_State *L, int index,
	SchematicManager *schemmgr, StringMap *replace_names);
Schematic *load_schematic(lua_State *L, int index, const NodeDefManager *ndef,
	StringMap *replace_names);
Schematic *load_schematic_from_def(lua_State *L, int index,
	const NodeDefManager *ndef, StringMap *replace_names);
bool read_schematic_def(lua_State *L, int index,
	Schematic *schem, std::vector<std::string> *names);

bool read_deco_simple(lua_State *L, DecoSimple *deco);
bool read_deco_schematic(lua_State *L, SchematicManager *schemmgr, DecoSchematic *deco);


///////////////////////////////////////////////////////////////////////////////

ObjDef *get_objdef(lua_State *L, int index, ObjDefManager *objmgr)
{
	if (index < 0)
		index = lua_gettop(L) + 1 + index;

	// If a number, assume this is a handle to an object def
	if (lua_isnumber(L, index))
		return objmgr->get(lua_tointeger(L, index));

	// If a string, assume a name is given instead
	if (lua_isstring(L, index))
		return objmgr->getByName(lua_tostring(L, index));

	return NULL;
}

///////////////////////////////////////////////////////////////////////////////

Schematic *get_or_load_schematic(lua_State *L, int index,
	SchematicManager *schemmgr, StringMap *replace_names)
{
	if (index < 0)
		index = lua_gettop(L) + 1 + index;

	Schematic *schem = (Schematic *)get_objdef(L, index, schemmgr);
	if (schem)
		return schem;

	schem = load_schematic(L, index, schemmgr->getNodeDef(),
		replace_names);
	if (!schem)
		return NULL;

	if (schemmgr->add(schem) == OBJDEF_INVALID_HANDLE) {
		delete schem;
		return NULL;
	}

	return schem;
}


Schematic *load_schematic(lua_State *L, int index, const NodeDefManager *ndef,
	StringMap *replace_names)
{
	if (index < 0)
		index = lua_gettop(L) + 1 + index;

	Schematic *schem = NULL;

	if (lua_istable(L, index)) {
		schem = load_schematic_from_def(L, index, ndef,
			replace_names);
		if (!schem) {
			delete schem;
			return NULL;
		}
	} else if (lua_isnumber(L, index)) {
		return NULL;
	} else if (lua_isstring(L, index)) {
		schem = SchematicManager::create(SCHEMATIC_NORMAL);

		std::string filepath = lua_tostring(L, index);
		if (!fs::IsPathAbsolute(filepath))
			filepath = ModApiBase::getCurrentModPath(L) + DIR_DELIM + filepath;

		if (!schem->loadSchematicFromFile(filepath, ndef,
				replace_names)) {
			delete schem;
			return NULL;
		}
	}

	return schem;
}


Schematic *load_schematic_from_def(lua_State *L, int index,
	const NodeDefManager *ndef, StringMap *replace_names)
{
	Schematic *schem = SchematicManager::create(SCHEMATIC_NORMAL);

	if (!read_schematic_def(L, index, schem, &schem->m_nodenames)) {
		delete schem;
		return NULL;
	}

	size_t num_nodes = schem->m_nodenames.size();

	schem->m_nnlistsizes.push_back(num_nodes);

	if (replace_names) {
		for (size_t i = 0; i != num_nodes; i++) {
			StringMap::iterator it = replace_names->find(schem->m_nodenames[i]);
			if (it != replace_names->end())
				schem->m_nodenames[i] = it->second;
		}
	}

	if (ndef)
		ndef->pendNodeResolve(schem);

	return schem;
}


bool read_schematic_def(lua_State *L, int index,
	Schematic *schem, std::vector<std::string> *names)
{
	if (!lua_istable(L, index))
		return false;

	//// Get schematic size
	lua_getfield(L, index, "size");
	v3s16 size = check_v3s16(L, -1);
	lua_pop(L, 1);

	schem->size = size;

	//// Get schematic data
	lua_getfield(L, index, "data");
	luaL_checktype(L, -1, LUA_TTABLE);

	u32 numnodes = size.X * size.Y * size.Z;
	schem->schemdata = new MapNode[numnodes];

	size_t names_base = names->size();
	std::unordered_map<std::string, content_t> name_id_map;

	u32 i = 0;
	for (lua_pushnil(L); lua_next(L, -2); i++, lua_pop(L, 1)) {
		if (i >= numnodes)
			continue;

		//// Read name
		std::string name;
		if (!getstringfield(L, -1, "name", name))
			throw LuaError("Schematic data definition with missing name field");