minetest/src/script/cpp_api/s_entity.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 "cpp_api/s_entity.h"
#include "cpp_api/s_internal.h"
#include "log.h"
#include "object_properties.h"
#include "common/c_converter.h"
#include "common/c_content.h"
bool ScriptApiEntity::luaentity_Add(u16 id, const char *name)
{
SCRIPTAPI_PRECHECKHEADER
verbosestream<<"scriptapi_luaentity_add: id="<<id<<" name=\""
<<name<<"\""<<std::endl;
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// Get core.registered_entities[name]
lua_getglobal(L, "core");
lua_getfield(L, -1, "registered_entities");
luaL_checktype(L, -1, LUA_TTABLE);
lua_pushstring(L, name);
lua_gettable(L, -2);
// Should be a table, which we will use as a prototype
//luaL_checktype(L, -1, LUA_TTABLE);
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if (lua_type(L, -1) != LUA_TTABLE){
errorstream<<"LuaEntity name \""<<name<<"\" not defined"<<std::endl;
return false;
}
int prototype_table = lua_gettop(L);
//dump2(L, "prototype_table");
// Create entity object
lua_newtable(L);
int object = lua_gettop(L);
// Set object metatable
lua_pushvalue(L, prototype_table);
lua_setmetatable(L, -2);
// Add object reference
// This should be userdata with metatable ObjectRef
objectrefGet(L, id);
luaL_checktype(L, -1, LUA_TUSERDATA);
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if (!luaL_checkudata(L, -1, "ObjectRef"))
luaL_typerror(L, -1, "ObjectRef");
lua_setfield(L, -2, "object");
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// core.luaentities[id] = object
lua_getglobal(L, "core");
lua_getfield(L, -1, "luaentities");
luaL_checktype(L, -1, LUA_TTABLE);
lua_pushnumber(L, id); // Push id
lua_pushvalue(L, object); // Copy object to top of stack
lua_settable(L, -3);
return true;
}
void ScriptApiEntity::luaentity_Activate(u16 id,
const std::string &staticdata, u32 dtime_s)
{
SCRIPTAPI_PRECHECKHEADER
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verbosestream << "scriptapi_luaentity_activate: id=" << id << std::endl;
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// Get core.luaentities[id]
luaentity_get(L, id);
int object = lua_gettop(L);
// Get on_activate function
lua_getfield(L, -1, "on_activate");
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if (!lua_isnil(L, -1)) {
luaL_checktype(L, -1, LUA_TFUNCTION);
lua_pushvalue(L, object); // self
lua_pushlstring(L, staticdata.c_str(), staticdata.size());
lua_pushinteger(L, dtime_s);
setOriginFromTable(object);
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PCALL_RES(lua_pcall(L, 3, 0, m_errorhandler));
} else {
lua_pop(L, 1);
}
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lua_pop(L, 1); // Pop object
}
void ScriptApiEntity::luaentity_Remove(u16 id)
{
SCRIPTAPI_PRECHECKHEADER
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verbosestream << "scriptapi_luaentity_rm: id=" << id << std::endl;
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// Get core.luaentities table
lua_getglobal(L, "core");
lua_getfield(L, -1, "luaentities");
luaL_checktype(L, -1, LUA_TTABLE);
int objectstable = lua_gettop(L);
// Set luaentities[id] = nil
lua_pushnumber(L, id); // Push id
lua_pushnil(L);
lua_settable(L, objectstable);
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lua_pop(L, 2); // pop luaentities, core
}
std::string ScriptApiEntity::luaentity_GetStaticdata(u16 id)
{
SCRIPTAPI_PRECHECKHEADER
//infostream<<"scriptapi_luaentity_get_staticdata: id="<<id<<std::endl;
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// Get core.luaentities[id]
luaentity_get(L, id);
int object = lua_gettop(L);
// Get get_staticdata function
lua_getfield(L, -1, "get_staticdata");
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if (lua_isnil(L, -1)) {
lua_pop(L, 2); // Pop entity and get_staticdata
return "";
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}
luaL_checktype(L, -1, LUA_TFUNCTION);
lua_pushvalue(L, object); // self
setOriginFromTable(object);
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PCALL_RES(lua_pcall(L, 1, 1, m_errorhandler));
lua_remove(L, object); // Remove object
size_t len = 0;
const char *s = lua_tolstring(L, -1, &len);
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lua_pop(L, 1); // Pop static data
return std::string(s, len);
}
void ScriptApiEntity::luaentity_GetProperties(u16 id,
ObjectProperties *prop)
{
SCRIPTAPI_PRECHECKHEADER
//infostream<<"scriptapi_luaentity_get_properties: id="<<id<<std::endl;
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// Get core.luaentities[id]
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luaentity_get(L, id);
// Set default values that differ from ObjectProperties defaults
prop->hp_max = 10;
/* Read stuff */
prop->hp_max = getintfield_default(L, -1, "hp_max", 10);
getboolfield(L, -1, "physical", prop->physical);
getboolfield(L, -1, "collide_with_objects", prop->collideWithObjects);
getfloatfield(L, -1, "weight", prop->weight);
lua_getfield(L, -1, "collisionbox");
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if (lua_istable(L, -1))
prop->collisionbox = read_aabb3f(L, -1, 1.0);
lua_pop(L, 1);
getstringfield(L, -1, "visual", prop->visual);
getstringfield(L, -1, "mesh", prop->mesh);
// Deprecated: read object properties directly
read_object_properties(L, -1, prop);
// Read initial_properties
lua_getfield(L, -1, "initial_properties");
read_object_properties(L, -1, prop);
lua_pop(L, 1);
}
void ScriptApiEntity::luaentity_Step(u16 id, float dtime)
{
SCRIPTAPI_PRECHECKHEADER
//infostream<<"scriptapi_luaentity_step: id="<<id<<std::endl;
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// Get core.luaentities[id]
luaentity_get(L, id);
int object = lua_gettop(L);
// State: object is at top of stack
// Get step function
lua_getfield(L, -1, "on_step");
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if (lua_isnil(L, -1)) {
lua_pop(L, 2); // Pop on_step and entity
return;
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}
luaL_checktype(L, -1, LUA_TFUNCTION);
lua_pushvalue(L, object); // self
lua_pushnumber(L, dtime); // dtime
setOriginFromTable(object);
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PCALL_RES(lua_pcall(L, 2, 0, m_errorhandler));
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lua_pop(L, 1); // Pop object
}
// Calls entity:on_punch(ObjectRef puncher, time_from_last_punch,
// tool_capabilities, direction)
void ScriptApiEntity::luaentity_Punch(u16 id,
ServerActiveObject *puncher, float time_from_last_punch,
const ToolCapabilities *toolcap, v3f dir)
{
SCRIPTAPI_PRECHECKHEADER
//infostream<<"scriptapi_luaentity_step: id="<<id<<std::endl;
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// Get core.luaentities[id]
luaentity_get(L,id);
int object = lua_gettop(L);
// State: object is at top of stack
// Get function
lua_getfield(L, -1, "on_punch");
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if (lua_isnil(L, -1)) {
lua_pop(L, 2); // Pop on_punch and entitu
return;
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}
luaL_checktype(L, -1, LUA_TFUNCTION);
lua_pushvalue(L, object); // self
objectrefGetOrCreate(L, puncher); // Clicker reference
lua_pushnumber(L, time_from_last_punch);
push_tool_capabilities(L, *toolcap);
push_v3f(L, dir);
setOriginFromTable(object);
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PCALL_RES(lua_pcall(L, 5, 0, m_errorhandler));
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lua_pop(L, 1); // Pop object
}
// Calls entity:on_rightclick(ObjectRef clicker)
void ScriptApiEntity::luaentity_Rightclick(u16 id,
ServerActiveObject *clicker)
{
SCRIPTAPI_PRECHECKHEADER
//infostream<<"scriptapi_luaentity_step: id="<<id<<std::endl;
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// Get core.luaentities[id]
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luaentity_get(L, id);
int object = lua_gettop(L);
// State: object is at top of stack
// Get function
lua_getfield(L, -1, "on_rightclick");
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if (lua_isnil(L, -1)) {
lua_pop(L, 2); // Pop on_rightclick and entity
return;
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}
luaL_checktype(L, -1, LUA_TFUNCTION);
lua_pushvalue(L, object); // self
objectrefGetOrCreate(L, clicker); // Clicker reference
setOriginFromTable(object);
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PCALL_RES(lua_pcall(L, 2, 0, m_errorhandler));
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lua_pop(L, 1); // Pop object
}