games/minimal/mods/default/textures/default_grass_side.png

/*
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_env.h"
#include "lua_api/l_internal.h"
#include "lua_api/l_nodemeta.h"
#include "lua_api/l_nodetimer.h"
#include "lua_api/l_noise.h"
#include "lua_api/l_vmanip.h"
#include "common/c_converter.h"
#include "common/c_content.h"
#include "scripting_game.h"
#include "environment.h"
#include "server.h"
#include "nodedef.h"
#include "daynightratio.h"
#include "util/pointedthing.h"
#include "content_sao.h"
#include "treegen.h"
#include "emerge.h"
#include "pathfinder.h"

struct EnumString ModApiEnvMod::es_ClearObjectsMode[] =
{
	{CLEAR_OBJECTS_MODE_FULL,  "full"},
	{CLEAR_OBJECTS_MODE_QUICK, "quick"},
	{0, NULL},
};

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


void LuaABM::trigger(ServerEnvironment *env, v3s16 p, MapNode n,
		u32 active_object_count, u32 active_object_count_wider)
{
	GameScripting *scriptIface = env->getScriptIface();
	scriptIface->realityCheck();

	lua_State *L = scriptIface->getStack();
	sanity_check(lua_checkstack(L, 20));
	StackUnroller stack_unroller(L);

	int error_handler = PUSH_ERROR_HANDLER(L);

	// Get registered_abms
	lua_getglobal(L, "core");
	lua_getfield(L, -1, "registered_abms");
	luaL_checktype(L, -1, LUA_TTABLE);
	lua_remove(L, -2); // Remove core

	// Get registered_abms[m_id]
	lua_pushnumber(L, m_id);
	lua_gettable(L, -2);
	if(lua_isnil(L, -1))
		FATAL_ERROR("");
	lua_remove(L, -2); // Remove registered_abms

	scriptIface->setOriginFromTable(-1);

	// Call action
	luaL_checktype(L, -1, LUA_TTABLE);
	lua_getfield(L, -1, "action");
	luaL_checktype(L, -1, LUA_TFUNCTION);
	lua_remove(L, -2); // Remove registered_abms[m_id]
	push_v3s16(L, p);
	pushnode(L, n, env->getGameDef()->ndef());
	lua_pushnumber(L, active_object_count);
	lua_pushnumber(L, active_object_count_wider);

	int result = lua_pcall(L, 4, 0, error_handler);
	if (result)
		scriptIface->scriptError(result, "LuaABM::trigger");

	lua_pop(L, 1); // Pop error handler
}

void LuaLBM::trigger(ServerEnvironment *env, v3s16 p, MapNode n)
{
	GameScripting *scriptIface = env->getScriptIface();
	scriptIface->realityCheck();

	lua_State *L = scriptIface->getStack();
	sanity_check(lua_checkstack(L, 20));
	StackUnroller stack_unroller(L);

	int error_handler = PUSH_ERROR_HANDLER(L);

	// Get registered_lbms
	lua_getglobal(L, "core");
	lua_getfield(L, -1, "registered_lbms");
	luaL_checktype(L, -1, LUA_TTABLE);
	lua_remove(L, -2); // Remove core

	// Get registered_lbms[m_id]
	lua_pushnumber(L, m_id);
	lua_gettable(L, -2);
	FATAL_ERROR_IF(lua_isnil(L, -1), "Entry with given id not found in registered_lbms table");
	lua_remove(L, -2); // Remove registered_lbms

	scriptIface->setOriginFromTable(-1);

	// Call action
	luaL_checktype(L, -1, LUA_TTABLE);
	lua_getfield(L, -1, "action");
	luaL_checktype(L, -1, LUA_TFUNCTION);
	lua_remove(L, -2); // Remove registered_lbms[m_id]
	push_v3s16(L, p);
	pushnode(L, n, env->getGameDef()->ndef());

	int result = lua_pcall(L, 2, 0, error_handler);
	if (result)
		scriptIface->scriptError(result, "LuaLBM::trigger");

	lua_pop(L, 1); // Pop error handler
}

void LuaEmergeAreaCallback(v3s16 blockpos, EmergeAction action, void *param)
{
	ScriptCallbackState *state = (ScriptCallbackState *)param;
	assert(state != NULL);
	assert(state->script != NULL);
	assert(state->refcount > 0);

	state->refcount--;

	state->script->on_emerge_area_completion(blockpos, action, state);

	if (state->refcount == 0)
		delete state;
}

// Exported functions

// set_node(pos, node)
// pos = {x=num, y=num, z=num}
int ModApiEnvMod::l_set_node(lua_State *L)
{
	GET_ENV_PTR;

	INodeDefManager *ndef = env->getGameDef()->ndef();
	// parameters
	v3s16 pos = read_v3s16(L, 1);
	MapNode n = readnode(L, 2, ndef);
	// Do it
	bool succeeded = env->setNode(pos, n);
	lua_pushboolean(L, succeeded);
	return 1;
}

int ModApiEnvMod::l_add_node(lua_State *L)
{
	return l_set_node(L);
}

// remove_node(pos)
// pos = {x=num, y=num, z=num}
int ModApiEnvMod::l_remove_node(lua_State *L)
{
	GET_ENV_PTR;

	// parameters
	v3s16 pos = read_v3s16(L, 1);
	// Do it
	bool succeeded = env->removeNode(pos);
	lua_pushboolean(L, succeeded);
	return 1;
}

// swap_node(pos, node)
// pos = {x=num, y=num, z=num}
int ModApiEnvMod::l_swap_node(lua_State *L)
{
	GET_ENV_PTR;

	INodeDefManager *ndef = env->getGameDef()->ndef();
	// parameters
	v3s16 pos = read_v3s16(L, 1);
	MapNode n = readnode(L, 2, ndef);
	// Do it
	bool succeeded = env->swapNode(pos, n);
	lua_pushboolean(L, succeeded);
	return 1;
}

// get_node(pos)
// pos = {x=num, y=num, z=num}
int ModApiEnvMod::l_get_node(lua_State *L)
{
	GET_ENV_PTR;

	// pos
	v3s16 pos = read_v3s16(L, 1);
	// Do it
	MapNode n = env->getMap().getNodeNoEx(pos);
	// Return node
	pushnode(L, n, env->getGameDef()->ndef());
	return 1;
}

// get_node_or_nil(pos)
// pos = {x=num, y=num, z=num}
int ModApiEnvMod::l_get_node_or_nil(lua_State *L)
{
	GET_ENV_PTR;

	// pos
	v3s16 pos = read_v3s16(L, 1);
	// Do it
	bool pos_ok;
	MapNode n = env->getMap().getNodeNoEx(pos, &pos_ok);
	if (pos_ok) {
		// Return node
		pushnode(L, n, env->getGameDef()->ndef());
	} else {
		lua_pushnil(L);
	}
	return 1;
}

// get_node_light(pos, timeofday)
// pos = {x=num, y=num, z=num}
// timeofday: nil = current time, 0 = night, 0.5 = day
int ModApiEnvMod::l_get_node_light(lua_State *L)
{
	GET_ENV_PTR;

	// Do it
	v3s16 pos = read_v3s16(L, 1);
	u32 time_of_day = env->getTimeOfDay();
	if(lua_isnumber(L, 2))
		time_of_day = 24000.0 * lua_tonumber(L, 2);
	time_of_day %= 24000;
	u32 dnr = time_to_daynight_ratio(time_of_day, true);

	bool is_position_ok;
	MapNode n = env->getMap().getNodeNoEx(pos, &is_position_ok);
	if (is_position_ok) {
		INodeDefManager *ndef = env->getGameDef()->ndef();
		lua_pushinteger(L, n.getLightBlend(dnr, ndef));
	} else {
		lua_pushnil(L);
	}
	return 1;
}

// place_node(pos, node)
// pos = {x=num, y=num, z=num}
int ModApiEnvMod::l_place_node(lua_State *L)
{
	GET_ENV_PTR;

	ScriptApiItem *scriptIfaceItem = getScriptApi<ScriptApiItem>(L);
	Server *server = getServer(L);
	INodeDefManager *ndef = server->ndef();
	IItemDefManager *idef = server->idef();

	v3s16 pos = read_v3s16(L, 1);
	MapNode n = readnode(L, 2, ndef);

	// Don't attempt to load non-loaded area as of now
	MapNode n_old = env->getMap().getNodeNoEx(pos);
	if(n_old.getContent() == CONTENT_IGNORE){
		lua_pushboolean(L, false);
		return 1;
	}
	// Create item to place
	ItemStack item(ndef->get(n).name, 1, 0, "", idef);
	// Make pointed position
	PointedThing pointed;
	pointed.type = POINTEDTHING_NODE;
	pointed.node_abovesurface = pos;
	pointed.node_undersurface = pos + v3s16(0,-1,0);
	// Place it with a NULL placer (appears in Lua as a non-functional
	// ObjectRef)
	bool success = scriptIfaceItem->item_OnPlace(item, NULL, pointed);
	lua_pushboolean(L, success);
	return 1;
}

// dig_node(pos)
// pos = {x=num, y=num, z=num}
int ModApiEnvMod::l_dig_node(lua_State *L)
{
	GET_ENV_PTR;

	ScriptApiNode *scriptIfaceNode = getScriptApi<ScriptApiNode>(L);

	v3s16 pos = read_v3s16(L, 1);

	// Don't attempt to load non-loaded area as of now
	MapNode n = env->getMap().getNodeNoEx(pos);
	if(n.getContent() == CONTENT_IGNORE){
		lua_pushboolean(L, false);
		return 1;
	}
	// Dig it out with a NULL digger (appears in Lua as a
	// non-functional ObjectRef)
	bool success = scriptIfaceNode->node_on_dig(pos, n, NULL);
	lua_pushboolean(L, success);
	return 1;
}

// punch_node(pos)
// pos = {x=num, y=num, z=num}
int ModApiEnvMod::l_punch_node(lua_State *L)
{
	GET_ENV_PTR;

	ScriptApiNode *scriptIfaceNode = getScriptApi<ScriptApiNode>(L);

	v3s16 pos = read_v3s16(L, 1);

	// Don't attempt to load non-loaded area as of now
	MapNode n = env->getMap().getNodeNoEx(pos);
	if(n.getContent() == CONTENT_IGNORE){
		lua_pushboolean(L, false);
		return 1;
	}
	// Punch it with a NULL puncher (appears in Lua as a non-functional
	// ObjectRef)
	bool success = scriptIfaceNode->node_on_punch(pos, n, NULL, PointedThing());
	lua_pushboolean(L, success);
	return 1;
}

// get_node_max_level(pos)
// pos = {x=num, y=num, z=num}
int ModApiEnvMod::l_get_node_max_level(lua_State *L)
{
	GET_ENV_PTR;

	v3s16 pos = read_v3s16(L, 1);
	MapNode n = env->getMap().getNodeNoEx(pos);
	lua_pushnumber(L, n.getMaxLevel(env->getGameDef()->ndef()));
	return 1;
}

// get_node_level(pos)
// pos = {x=num, y=num, z=num}
int ModApiEnvMod::l_get_node_level(lua_State *L)
{
	GET_ENV_PTR;

	v3s16 pos = read_v3s16(L, 1);
	MapNode n = env->getMap().getNodeNoEx(pos);
	lua_pushnumber(L, n.getLevel(env->getGameDef()->ndef()));
	return 1;
}

// set_node_level(pos, level)
// pos = {x=num, y=num, z=num}
// level: 0..63
int ModApiEnvMod::l_set_node_level(lua_State *L)
{
	GET_ENV_PTR;

	v3s16 pos = read_v3s16(L, 1);
	u8 level = 1;
	if(lua_isnumber(L, 2))
		level = lua_tonumber(L, 2);
	MapNode n = env->getMap().getNodeNoEx(pos);
	lua_pushnumber(L, n.setLevel(env->getGameDef()->ndef(), level));
	env->setNode(pos, n);
	return 1;
}

// add_node_level(pos, level)
// pos = {x=num, y=num, z=num}
// level: 0..63
int ModApiEnvMod::l_add_node_level(lua_State *L)
{
	GET_ENV_PTR;

	v3s16 pos = read_v3s16(L, 1);
	u8 level = 1;
	if(lua_isnumber(L, 2))
		level = lua_tonumber(L, 2);
	MapNode n = env->getMap().getNodeNoEx(pos);
	lua_pushnumber(L, n.addLevel(env->getGameDef()->ndef(), level));
	env->setNode(pos, n);
	return 1;
}

// find_nodes_with_meta(pos1, pos2)
int ModApiEnvMod::l_find_nodes_with_meta(lua_State *L)
{
	GET_ENV_PTR;

	std::vector<v3s16> positions = env->getMap().findNodesWithMetadata(
		check_v3s16(L, 1), check_v3s16(L, 2));

	lua_newtable(L);
	for (size_t i = 0; i != positions.size(); i++) {
		push_v3s16(L, positions[i]);
		lua_rawseti(L, -2, i + 1);
	}

	return 1;
}

// get_meta(pos)
int ModApiEnvMod::l_get_meta(lua_State *L)
{
	GET_ENV_PTR;

	// Do it
	v3s16 p = read_v3s16(L, 1);
	NodeMetaRef::create(L, p, env);
	return 1;
}

// get_node_timer(pos)
int ModApiEnvMod::l_get_node_timer(lua_State *L)
{
	GET_ENV_PTR;

	// Do it
	v3s16 p = read_v3s16(L, 1);
	NodeTimerRef::create(L, p, env);
	return 1;
}

// add_entity(pos, entityname) -> ObjectRef or nil
// pos = {x=num, y=num, z=num}
int ModApiEnvMod::l_add_entity(lua_State *L)
{
	GET_ENV_PTR;

	// pos
	v3f pos = checkFloatPos(L, 1);
	// content
	const char *name = luaL_checkstring(L, 2);
	// Do it
	ServerActiveObject *obj = new LuaEntitySAO(env, pos, name, "");
	int objectid = env->addActiveObject(obj);
	// If failed to add, return nothing (reads as nil)
	if(objectid == 0)
		return 0;
	// Return ObjectRef
	getScriptApiBase(L)->objectrefGetOrCreate(L, obj);
	return 1;
}

// add_item(pos, itemstack or itemstring or table) -> ObjectRef or nil
// pos = {x=num, y=num, z=num}
int ModApiEnvMod::l_add_item(lua_State *L)
{
	GET_ENV_PTR;

	// pos
	//v3f pos = checkFloatPos(L, 1);
	// item
	ItemStack item = read_item(L, 2,getServer(L));
	if(item.empty() || !item.isKnown(getServer(L)->idef()))
		return 0;

	int error_handler = PUSH_ERROR_HANDLER(L);

	// Use spawn_item to spawn a __builtin:item
	lua_getglobal(L, "core");
	lua_getfield(L, -1, "spawn_item");
	lua_remove(L, -2); // Remove core
	if(lua_isnil(L, -1))
		return 0;
	lua_pushvalue(L, 1);
	lua_pushstring(L, item.getItemString().c_str());

	PCALL_RESL(L, lua_pcall(L, 2, 1, error_handler));

	lua_remove(L, error_handler);
	return 1;
}

// get_player_by_name(name)
int ModApiEnvMod::l_get_player_by_name(lua_State *L)
{
	GET_ENV_PTR;

	// Do it
	const char *name = luaL_checkstring(L, 1);
	Player *player = env->getPlayer(name);
	if(player == NULL){
		lua_pushnil(L);
		return 1;
	}
	PlayerSAO *sao = player->getPlayerSAO();
	if(sao == NULL){
		lua_pushnil(L);
		return 1;
	}
	// Put player on stack
	getScriptApiBase(L)->objectrefGetOrCreate(L, sao);
	return 1;
}

// get_objects_inside_radius(pos, radius)
int ModApiEnvMod::l_get_objects_inside_radius(lua_State *L)
{
	GET_ENV_PTR;

	// Do it
	v3f pos = checkFloatPos(L, 1);
	float radius = luaL_checknumber(L, 2) * BS;
	std::vector<u16> ids;
	env->getObjectsInsideRadius(ids, pos, radius);
	ScriptApiBase *script = getScriptApiBase(L);
	lua_createtable(L, ids.size(), 0);
	std::vector<u16>::const_iterator iter = ids.begin();
	for(u32 i = 0; iter != ids.end(); iter++) {
		ServerActiveObject *obj = env->getActiveObject(*iter);
		// Insert object reference into table
		script->objectrefGetOrCreate(L, obj);
		lua_rawseti(L, -2, ++i);
	}
	return 1;
}

// set_timeofday(val)
// val = 0...1
int ModApiEnvMod::l_set_timeofday(lua_State *L)
{
	GET_ENV_PTR;

	// Do it
	float timeofday_f = luaL_checknumber(L, 1);
	sanity_check(timeofday_f >= 0.0 && timeofday_f <= 1.0);
	int timeofday_mh = (int)(timeofday_f * 24000.0);
	// This should be set directly in the environment but currently
	// such changes aren't immediately sent to the clients, so call
	// the server instead.
	//env->setTimeOfDay(timeofday_mh);
	getServer(L)->setTimeOfDay(timeofday_mh);
	return 0;
}

// get_timeofday() -> 0...1
int ModApiEnvMod::l_get_timeofday(lua_State *L)
{
	GET_ENV_PTR;

	// Do it
	int timeofday_mh = env->getTimeOfDay();
	float timeofday_f = (float)timeofday_mh / 24000.0;
	lua_pushnumber(L, timeofday_f);
	return 1;
}

// get_day_count() -> int
int ModApiEnvMod::l_get_day_count(lua_State *L)
{
	GET_ENV_PTR;

	lua_pushnumber(L, env->getDayCount());
	return 1;
}

// get_gametime()
int ModApiEnvMod::l_get_gametime(lua_State *L)
{
	GET_ENV_PTR;

	int game_time = env->getGameTime();
	lua_pushnumber(L, game_time);
	return 1;
}


// find_node_near(pos, radius, nodenames) -> pos or nil
// nodenames: eg. {"ignore", "group:tree"} or "default:dirt"
int ModApiEnvMod::l_find_node_near(lua_State *L)
{
	GET_ENV_PTR;

	INodeDefManager *ndef = getServer(L)->ndef();
	v3s16 pos = read_v3s16(L, 1);
	int radius = luaL_checkinteger(L, 2);
	std::set<content_t> filter;
	if(lua_istable(L, 3)){
		int table = 3;
		lua_pushnil(L);
		while(lua_next(L, table) != 0){
			// key at index -2 and value at index -1
			luaL_checktype(L, -1, LUA_TSTRING);
			ndef->getIds(lua_tostring(L, -1), filter);
			// removes value, keeps key for next iteration
			lua_pop(L, 1);
		}
	} else if(lua_isstring(L, 3)){
		ndef->getIds(lua_tostring(L, 3), filter);
	}

	for(int d=1; d<=radius; d++){
		std::vector<v3s16> list = FacePositionCache::getFacePositions(d);
		for(std::vector<v3s16>::iterator i = list.begin();
				i != list.end(); ++i){
			v3s16 p = pos + (*i);
			content_t c = env->getMap().getNodeNoEx(p).getContent();
			if(filter.count(c) != 0){
				push_v3s16(L, p);
				return 1;
			}
		}
	}
	return 0;
}

// find_nodes_in_area(minp, maxp, nodenames) -> list of positions
// nodenames: eg. {"ignore", "group:tree"} or "default:dirt"
int ModApiEnvMod::l_find_nodes_in_area(lua_State *L)
{
	GET_ENV_PTR;

	INodeDefManager *ndef = getServer(L)->ndef();
	v3s16 minp = read_v3s16(L, 1);
	v3s16 maxp = read_v3s16(L, 2);
	std::set<content_t> filter;
	if(lua_istable(L, 3)) {
		int table = 3;
		lua_pushnil(L);
		while(lua_next(L, table) != 0) {
			// key at index -2 and value at index -1
			luaL_checktype(L, -1, LUA_TSTRING);
			ndef->getIds(lua_tostring(L, -1), filter);
			// removes value, keeps key for next iteration
			lua_pop(L, 1);
		}
	} else if(lua_isstring(L, 3)) {
		ndef->getIds(lua_tostring(L, 3), filter);
	}

	std::map<content_t, u16> individual_count;

	lua_newtable(L);
	u64 i = 0;
	for (s16 x = minp.X; x <= maxp.X; x++)
		for (s16 y = minp.Y; y <= maxp.Y; y++)
			for (s16 z = minp.Z; z <= maxp.Z; z++) {
				v3s16 p(x, y, z);
				content_t c = env->getMap().getNodeNoEx(p).getContent();
				if (filter.count(c) != 0) {
					push_v3s16(L, p);
					lua_rawseti(L, -2, ++i);
					individual_count[c]++;
				}
	}
	lua_newtable(L);
	for (std::set<content_t>::iterator it = filter.begin();
			it != filter.end(); ++it) {
		lua_pushnumber(L, individual_count[*it]);
		lua_setfield(L, -2, ndef->get(*it).name.c_str());
	}
	return 2;
}

// find_nodes_in_area_under_air(minp, maxp, nodenames) -> list of positions
// nodenames: e.g. {"ignore", "group:tree"} or "default:dirt"
int ModApiEnvMod::l_find_nodes_in_area_under_air(lua_State *L)
{
	/* Note: A similar but generalized (and therefore slower) version of this
	 * function could be created -- e.g. find_nodes_in_area_under -- which
	 * would accept a node name (or ID?) or list of names that the "above node"
	 * should be.
	 * TODO
	 */

	GET_ENV_PTR;

	INodeDefManager *ndef = getServer(L)->ndef();
	v3s16 minp = read_v3s16(L, 1);
	v3s16 maxp = read_v3s16(L, 2);
	std::set<content_t> filter;

	if (lua_istable(L, 3)) {
		int table = 3;
		lua_pushnil(L);
		while(lua_next(L, table) != 0) {
			// key at index -2 and value at index -1
			luaL_checktype(L, -1, LUA_TSTRING);
			ndef->getIds(lua_tostring(L, -1), filter);
			// removes value, keeps key for next iteration
			lua_pop(L, 1);
		}
	} else if (lua_isstring(L, 3)) {
		ndef->getIds(lua_tostring(L, 3), filter);
	}

	lua_newtable(L);
	u64 i = 0;
	for (s16 x = minp.X; x <= maxp.X; x++)
	for (s16 z = minp.Z; z <= maxp.Z; z++) {
ofs	hex dump	ascii
0000	89 50 4e 47 0d 0a 1a 0a 00 00 00 0d 49 48 44 52 00 00 00 10 00 00 00 10 08 06 00 00 00 1f f3 ff	.PNG........IHDR................
0020	61 00 00 00 01 73 52 47 42 00 ae ce 1c e9 00 00 00 06 62 4b 47 44 00 ff 00 ff 00 ff a0 bd a7 93	a....sRGB.........bKGD..........
0040	00 00 00 09 70 48 59 73 00 00 0b 13 00 00 0b 13 01 00 9a 9c 18 00 00 00 07 74 49 4d 45 07 db 02	....pHYs.................tIME...
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0360	1a 11 00 00 00 00 49 45 4e 44 ae 42 60 82	......IEND.B`.