minetest/src/scriptapi_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 "scriptapi.h"
#include "scriptapi_entity.h"
extern "C" {
#include <lauxlib.h>
}
#include "log.h"
#include "script.h"
#include "scriptapi_types.h"
#include "scriptapi_object.h"
#include "scriptapi_common.h"
void luaentity_get(lua_State *L, u16 id)
{
// Get minetest.luaentities[i]
lua_getglobal(L, "minetest");
lua_getfield(L, -1, "luaentities");
luaL_checktype(L, -1, LUA_TTABLE);
lua_pushnumber(L, id);
lua_gettable(L, -2);
lua_remove(L, -2); // luaentities
lua_remove(L, -2); // minetest
}
/*
luaentity
*/
bool scriptapi_luaentity_add(lua_State *L, u16 id, const char *name)
{
realitycheck(L);
assert(lua_checkstack(L, 20));
verbosestream<<"scriptapi_luaentity_add: id="<<id<<" name=\""
<<name<<"\""<<std::endl;
StackUnroller stack_unroller(L);
// Get minetest.registered_entities[name]
lua_getglobal(L, "minetest");
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);
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
objectref_get(L, id);
luaL_checktype(L, -1, LUA_TUSERDATA);
if(!luaL_checkudata(L, -1, "ObjectRef"))
luaL_typerror(L, -1, "ObjectRef");
lua_setfield(L, -2, "object");
// minetest.luaentities[id] = object
lua_getglobal(L, "minetest");
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 scriptapi_luaentity_activate(lua_State *L, u16 id,
const std::string &staticdata, u32 dtime_s)
{
realitycheck(L);
assert(lua_checkstack(L, 20));
verbosestream<<"scriptapi_luaentity_activate: id="<<id<<std::endl;
StackUnroller stack_unroller(L);
// Get minetest.luaentities[id]
luaentity_get(L, id);
int object = lua_gettop(L);
// Get on_activate function
lua_pushvalue(L, object);
lua_getfield(L, -1, "on_activate");
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);
// Call with 3 arguments, 0 results
if(lua_pcall(L, 3, 0, 0))
script_error(L, "error running function on_activate: %s\n",
lua_tostring(L, -1));
}
}
void scriptapi_luaentity_rm(lua_State *L, u16 id)
{
realitycheck(L);
assert(lua_checkstack(L, 20));
verbosestream<<"scriptapi_luaentity_rm: id="<<id<<std::endl;
// Get minetest.luaentities table
lua_getglobal(L, "minetest");
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);
lua_pop(L, 2); // pop luaentities, minetest
}
std::string scriptapi_luaentity_get_staticdata(lua_State *L, u16 id)
{
realitycheck(L);
assert(lua_checkstack(L, 20));
//infostream<<"scriptapi_luaentity_get_staticdata: id="<<id<<std::endl;
StackUnroller stack_unroller(L);
// Get minetest.luaentities[id]
luaentity_get(L, id);
int object = lua_gettop(L);
// Get get_staticdata function
lua_pushvalue(L, object);
lua_getfield(L, -1, "get_staticdata");
if(lua_isnil(L, -1))
return "";
luaL_checktype(L, -1, LUA_TFUNCTION);
lua_pushvalue(L, object); // self
// Call with 1 arguments, 1 results
if(lua_pcall(L, 1, 1, 0))
script_error(L, "error running function get_staticdata: %s\n",
lua_tostring(L, -1));
size_t len=0;
const char *s = lua_tolstring(L, -1, &len);
return std::string(s, len);
}
void scriptapi_luaentity_get_properties(lua_State *L, u16 id,
ObjectProperties *prop)
{
realitycheck(L);
assert(lua_checkstack(L, 20));
//infostream<<"scriptapi_luaentity_get_properties: id="<<id<<std::endl;
StackUnroller stack_unroller(L);
// Get minetest.luaentities[id]
luaentity_get(L, id);
//int object = lua_gettop(L);
// 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);
getfloatfield(L, -1, "weight", prop->weight);
lua_getfield(L, -1, "collisionbox");
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 scriptapi_luaentity_step(lua_State *L, u16 id, float dtime)
{
realitycheck(L);
assert(lua_checkstack(L, 20));
//infostream<<"scriptapi_luaentity_step: id="<<id<<std::endl;
StackUnroller stack_unroller(L);
// Get minetest.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");
if(lua_isnil(L, -1))
return;
luaL_checktype(L, -1, LUA_TFUNCTION);
lua_pushvalue(L, object); // self
lua_pushnumber(L, dtime); // dtime
// Call with 2 arguments, 0 results
if(lua_pcall(L, 2, 0, 0))
script_error(L, "error running function 'on_step': %s\n", lua_tostring(L, -1));
}
// Calls entity:on_punch(ObjectRef puncher, time_from_last_punch,
// tool_capabilities, direction)
void scriptapi_luaentity_punch(lua_State *L, u16 id,
ServerActiveObject *puncher, float time_from_last_punch,
const ToolCapabilities *toolcap, v3f dir)
{
realitycheck(L);
assert(lua_checkstack(L, 20));
//infostream<<"scriptapi_luaentity_step: id="<<id<<std::endl;
StackUnroller stack_unroller(L);
// Get minetest.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");
if(lua_isnil(L, -1))
return;
luaL_checktype(L, -1, LUA_TFUNCTION);
lua_pushvalue(L, object); // self
objectref_get_or_create(L, puncher); // Clicker reference
lua_pushnumber(L, time_from_last_punch);
push_tool_capabilities(L, *toolcap);
push_v3f(L, dir);
// Call with 5 arguments, 0 results
if(lua_pcall(L, 5, 0, 0))
script_error(L, "error running function 'on_punch': %s\n", lua_tostring(L, -1));
}
// Calls entity:on_rightclick(ObjectRef clicker)
void scriptapi_luaentity_rightclick(lua_State *L, u16 id,
ServerActiveObject *clicker)
{
realitycheck(L);
assert(lua_checkstack(L, 20));
//infostream<<"scriptapi_luaentity_step: id="<<id<<std::endl;
StackUnroller stack_unroller(L);
// Get minetest.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_rightclick");
if(lua_isnil(L, -1))
return;
luaL_checktype(L, -1, LUA_TFUNCTION);
lua_pushvalue(L, object); // self
objectref_get_or_create(L, clicker); // Clicker reference
// Call with 2 arguments, 0 results
if(lua_pcall(L, 2, 0, 0))
script_error(L, "error running function 'on_rightclick': %s\n", lua_tostring(L, -1));
}