LuaYard/LuaEngine.cpp

#include "LuaEngine.h"
#include <iostream>
#include <string>
#include <thread>
#include <vector>
#include <cstdlib>
#include "SDL2/include/SDL.h"
#include "SDL2/include/SDL_mixer.h"
#include "SDL2/include/SDL_ttf.h"
#include "SDL2/include/SDL_image.h"
#include "PlatAPI.h"
using namespace std;

// Global single-thread unprotected event callback id counter
int callback_counter = 1;

bool LuaCompareType(lua_State* L, int index, const char* type, bool leave=false)
{
	int indexType = lua_getfield(L, index, "type");
	if (indexType == LUA_TSTRING)
	{
		if (strcmp(lua_tostring(L, -1), type) == 0)
		{
			if(!leave) lua_pop(L, 1);
			return true;
		}
		else
		{
			if (!leave) lua_pop(L, 1);
			return false;
		}
	}
	else
	{
		lua_pop(L, 1);
		if (leave) lua_pushstring(L, lua_typename(L, indexType));
		return false;
	}
}

void check(lua_State* L, const vector<int>& typearr, const vector<const char*>& userdata_type=vector<const char*>())
{
	int sz = typearr.size();
	int nextIndex = 0;
	int maxIndex = userdata_type.size();
	for (int i = 0; i < sz; i++)
	{
		int thisType = lua_type(L, i + 1);
		if (thisType != typearr[i])
		{
			luaL_error(L, "Bad argument #%d. %s expected, got %s", i + 1, lua_typename(L, typearr[i]), lua_typename(L, lua_type(L, i + 1)));
		}
		if (maxIndex && thisType == LUA_TUSERDATA)
		{
			if (nextIndex < maxIndex)
			{
				if (!LuaCompareType(L, i + 1, userdata_type[nextIndex], true))
				{
					luaL_error(L, "Bad argument #%d. %s expected, got %s", i + 1, userdata_type[nextIndex], lua_tostring(L, -1));
				}
				nextIndex++;
			}
			else
			{
				luaL_error(L, "Not enough userdata type string.");
			}
		}
	}
}

// Generate SDL error on lua stack.
// NOTE: Never returns. If this function is used in C++ context, you should compile Lua as C++.
void LuaSDLError(lua_State* L)
{
	luaL_error(L, "SDLError: %s", SDL_GetError());
}

void ConvertMusicAsyncImpl(const string& filename, const string& targetname, int ticket)
{
	string command = "bin\\ffmpeg.exe -y -loglevel error -hide_banner -i \""s + filename + "\" \"" + targetname + "\"";
	cout << command << endl;
	system(command.c_str());
	SDL_Event e;
	e.type = SDL_USEREVENT;
	e.user.code = 1002;  // General zero ret callback.
	e.user.data1 = new int(ticket);
	e.user.data2 = nullptr;
	SDL_PushEvent(&e);
}

static int ConvertMusicAsync(lua_State* L)
{
	check(L, { LUA_TSTRING, LUA_TSTRING, LUA_TFUNCTION });
	lua_pushfstring(L, "cb%d", callback_counter);
	lua_pushvalue(L, 3);
	lua_settable(L, LUA_REGISTRYINDEX);
	string filename(lua_tostring(L, 1));
	string targetname(lua_tostring(L, 2));
	thread td(ConvertMusicAsyncImpl, filename, targetname, callback_counter);
	td.detach();
	lua_pushnumber(L, callback_counter);
	callback_counter++;
	return 1;
}

struct LuaTimerCallbackData
{
	void* p;
	int id;
	int type; // 0=setTimeout, 1=setInterval
};

Uint32 LuaTimerCallbackGate(Uint32 interval, void* param)
{
	SDL_Event e;
	e.type = SDL_USEREVENT;
	e.user.code = 1001;
	e.user.data1 = param;
	SDL_PushEvent(&e);
	return ((LuaTimerCallbackData*)(param))->type ? interval : 0;
}

int GetMouseState(const char** output, Uint32 state)
{
	int i = 0;
	if (state & SDL_BUTTON_LMASK)
	{
		output[i++] = "left";
	}
	if (state & SDL_BUTTON_MMASK)
	{
		output[i++] = "middle";
	}
	if (state & SDL_BUTTON_RMASK)
	{
		output[i++] = "right";
	}
	if (state & SDL_BUTTON_X1MASK)
	{
		output[i++] = "x1";
	}
	if (state & SDL_BUTTON_X2MASK)
	{
		output[i++] = "x2";
	}
	return i;
}

#define setfn(L, cfunc, name) lua_pushcfunction(L, cfunc); lua_setfield(L, -2, name)

struct Window
{
	SDL_Window* wnd;

	static int close(lua_State* L)
	{
		check(L, { LUA_TUSERDATA });
		cout << "In Window::close" << endl;
		Window* p = (Window*)lua_touserdata(L, 1);
		if (p->wnd)
		{
			// release data table
			lua_pushlightuserdata(L, p);
			lua_pushnil(L);
			lua_settable(L, LUA_REGISTRYINDEX);
			SDL_DestroyWindow(p->wnd);
			p->wnd = nullptr;
		}
		return 0;
	}

	static int set_event_handler(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TSTRING, LUA_TFUNCTION }, { "window" });
		if (strcmp(lua_tostring(L, 2), "quit") == 0)  // quit<69>¼<EFBFBD><C2BC><EFBFBD><EFBFBD>⴦<EFBFBD><E2B4A6>
		{
			lua_pushlightuserdata(L, &StartEngine);
			lua_gettable(L, LUA_REGISTRYINDEX);
			lua_getfield(L, -1, "onquit");
			lua_pushvalue(L, 3);
			lua_setfield(L, -3, "onquit");
			return 1;  // return old callback.
		}

		Window* p = (Window*)lua_touserdata(L, 1);
		if (p->wnd)
		{
			lua_pushlightuserdata(L, p->wnd);
			if (lua_gettable(L, LUA_REGISTRYINDEX) != LUA_TTABLE)
			{
				lua_pop(L, 1);

				lua_pushlightuserdata(L, p->wnd);

				lua_newtable(L);
				lua_pushfstring(L, "on%s", lua_tostring(L, 2));
				lua_pushvalue(L, 3);
				lua_settable(L, -3);

				lua_settable(L, LUA_REGISTRYINDEX);

				lua_pushnil(L);  // No old callback. Will return empty.
			}
			else
			{
				lua_pushfstring(L, "on%s", lua_tostring(L, 2));
				lua_pushvalue(L, -1);
				// window, eventName, callback, windowCBTable, onEvent, onEvent
				lua_gettable(L, -3);
				// window, eventName, callback, windowCBTable, onEvent, oldCallback
				lua_pushvalue(L, -2);
				lua_pushvalue(L, 3);
				// window, eventName, callback, windowCBTable, onEvent, oldCallback, onEvent, callback
				lua_settable(L, -5);
				// window, eventName, callback, windowCBTable, onEvent, oldCallback
			}
			return 1;
		}
		else
		{
			return luaL_error(L, "Unable to add event listener to null window.");
		}
	}

	static int showWindow(lua_State* L)
	{
		check(L, { LUA_TUSERDATA });
		Window* p = (Window*)lua_touserdata(L, 1);
		SDL_ShowWindow(p->wnd);

		return 0;
	}

	static int hideWindow(lua_State* L)
	{
		check(L, { LUA_TUSERDATA });
		Window* p = (Window*)lua_touserdata(L, 1);

		SDL_HideWindow(p->wnd);
		return 0;
	}
	
	static int create(lua_State* L)
	{
		check(L, { LUA_TSTRING, LUA_TNUMBER, LUA_TNUMBER });
		cout << "In Window::create" << endl;
		Window* p = (Window*) lua_newuserdata(L, sizeof(Window));
		// Data table (for storing lua values)
		lua_pushlightuserdata(L, p);
		lua_newtable(L);
		lua_settable(L, LUA_REGISTRYINDEX);
		// Metatable
		lua_getfield(L, LUA_REGISTRYINDEX, "__window_mt");
		if (lua_type(L, -1) == LUA_TNIL)
		{
			lua_pop(L, 1);
			lua_newtable(L);
			// GC
			lua_pushcfunction(L, close);
			lua_setfield(L, -2, "__gc");

			// Fields
			lua_newtable(L);
			lua_pushstring(L, "window"); lua_setfield(L, -2, "type");
			setfn(L, close, "close");
			setfn(L, set_event_handler, "on");
			setfn(L, showWindow, "show");
			setfn(L, hideWindow, "hide");

			// Binding
			lua_setfield(L, -2, "__index");
			
			lua_setfield(L, LUA_REGISTRYINDEX, "__window_mt");
			lua_getfield(L, LUA_REGISTRYINDEX, "__window_mt");
		}
		lua_setmetatable(L, -2);

		// Internal logic
		p->wnd = SDL_CreateWindow(lua_tostring(L, 1), SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, lua_tointeger(L, 2), lua_tointeger(L, 3), SDL_WINDOW_HIDDEN);
		return 1;
	}
};


struct Texture
{
	SDL_Texture* text;
	int w;
	int h;

	static int close(lua_State* L)
	{
		check(L, { LUA_TUSERDATA });
		cout << "In Texture::close" << endl;
		Texture* t = (Texture*)lua_touserdata(L, 1);
		if (t->text)
		{
			SDL_DestroyTexture(t->text);
			t->text = nullptr;
		}
		return 0;
	}

	static void create(lua_State* L) // -2, +1
	{
		// <20>˺<EFBFBD><CBBA><EFBFBD><EFBFBD><EFBFBD>Renderer<65><72>C<EFBFBD><43>ֱ<EFBFBD>ӵ<EFBFBD><D3B5><EFBFBD>. <20><><EFBFBD><EFBFBD>ǰ<EFBFBD><C7B0>Ҫ<EFBFBD>ȷ<EFBFBD>һ<EFBFBD><D2BB>renderer userdata<74><61>lightuserdata<74><61>ջ<EFBFBD><D5BB>, ֵ<><D6B5><EFBFBD>ǵ<EFBFBD>ǰ<EFBFBD><C7B0>SDL_Texture.
		// <20><><EFBFBD>ú<EFBFBD>ջ<EFBFBD>ϻ<EFBFBD><CFBB><EFBFBD><EFBFBD><EFBFBD>Texture<72><65>userdata.
		// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Lua<75><61>û<EFBFBD><C3BB>ֱ<EFBFBD>Ӵ<EFBFBD><D3B4><EFBFBD>Texture<72>ķ<EFBFBD><C4B7><EFBFBD>.
		cout << "In Texture::create" << endl;
		Texture* p = (Texture*)lua_newuserdata(L, sizeof(Texture));
		// Metatable
		lua_getfield(L, LUA_REGISTRYINDEX, "__texture_mt");
		if (lua_type(L, -1) == LUA_TNIL)
		{
			lua_pop(L, 1);
			lua_newtable(L);
			// GC
			lua_pushcfunction(L, close);
			lua_setfield(L, -2, "__gc");

			// Fields
			lua_newtable(L);
			lua_pushstring(L, "texture"); lua_setfield(L, -2, "type");
			setfn(L, close, "close");

			// Binding
			lua_setfield(L, -2, "__index");

			lua_setfield(L, LUA_REGISTRYINDEX, "__texture_mt");
			lua_getfield(L, LUA_REGISTRYINDEX, "__texture_mt");
		}
		lua_setmetatable(L, -2);
		p->text = (SDL_Texture * )lua_touserdata(L, -2);
		SDL_QueryTexture(p->text, NULL, NULL, &p->w, &p->h);
		lua_pushvalue(L, -3);
		lua_setuservalue(L, -2);   // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Rendere userdata

		// stack balance
		lua_remove(L, lua_gettop(L) - 1); // ɾ<><C9BE>lightuserdata
		lua_remove(L, lua_gettop(L) - 1); // ɾ<><C9BE>rendere userdata
	}
};

int LuaRectPointToRect(lua_State* L, int index, SDL_Rect& rect)
{
	if (lua_getfield(L, index, "type") != LUA_TSTRING)
	{
		lua_pop(L, 1);
		return -1;
	}

	const char* type = lua_tostring(L, -1);
	if (strcmp(type, "point") == 0)
	{
		lua_pop(L, 1);
		lua_getfield(L, index, "x");
		rect.x = lua_tointeger(L, -1);
		lua_pop(L, 1);
		lua_getfield(L, index, "y");
		rect.y = lua_tointeger(L, -1);
		lua_pop(L, 1);

		return 1;
	}
	else if (strcmp(type, "rect") == 0)
	{
		lua_pop(L, 1);
		lua_getfield(L, index, "x");
		rect.x = lua_tointeger(L, -1);
		lua_pop(L, 1);
		lua_getfield(L, index, "y");
		rect.y = lua_tointeger(L, -1);
		lua_pop(L, 1);
		lua_getfield(L, index, "w");
		rect.w = lua_tointeger(L, -1);
		lua_pop(L, 1);
		lua_getfield(L, index, "h");
		rect.h = lua_tointeger(L, -1);
		lua_pop(L, 1);

		return 0;
	}
	else
	{
		return -1;
	}
}

struct Surface
{
	SDL_Surface* surf;

	static int close(lua_State* L)
	{
		check(L, { LUA_TUSERDATA });
		cout << "In Surface::close" << endl;
		Surface* p = (Surface*)lua_touserdata(L, 1);
		if (p->surf)
		{
			SDL_FreeSurface(p->surf);
			p->surf = nullptr;
		}
		return 0;
	}

	static void create(lua_State* L) // -1, +1
	{
		cout << "In Surface::create" << endl;
		Surface* p = (Surface*)lua_newuserdata(L, sizeof(Surface));
		// Metatable
		lua_getfield(L, LUA_REGISTRYINDEX, "__surface_mt");
		if (lua_type(L, -1) == LUA_TNIL)
		{
			lua_pop(L, 1);
			lua_newtable(L);
			// GC
			lua_pushcfunction(L, close);
			lua_setfield(L, -2, "__gc");

			// Fields
			lua_newtable(L);
			lua_pushstring(L, "surface"); lua_setfield(L, -2, "type");
			setfn(L, close, "close");

			// Binding
			lua_setfield(L, -2, "__index");

			lua_setfield(L, LUA_REGISTRYINDEX, "__surface_mt");
			lua_getfield(L, LUA_REGISTRYINDEX, "__surface_mt");
		}
		lua_setmetatable(L, -2);
		p->surf = (SDL_Surface*)lua_touserdata(L, -2);

		// stack balance
		lua_remove(L, lua_gettop(L) - 1); // ɾ<><C9BE>lightuserdata
	}
};

struct Renderer
{
	SDL_Renderer* rnd;

	static int close(lua_State* L)
	{
		check(L, { LUA_TUSERDATA });
		cout << "In Renderer::close" << endl;
		Renderer* p = (Renderer*)lua_touserdata(L, 1);
		if (p->rnd)
		{
			SDL_DestroyRenderer(p->rnd);
			p->rnd = nullptr;
		}
		return 0;
	}

	static int update(lua_State* L)
	{
		check(L, { LUA_TUSERDATA });
		Renderer* p = (Renderer*)lua_touserdata(L, 1);
		SDL_RenderPresent(p->rnd);
		return 0;
	}

	static int clear(lua_State* L)
	{
		check(L, { LUA_TUSERDATA });
		Renderer* p = (Renderer*)lua_touserdata(L, 1);
		SDL_RenderClear(p->rnd);
		return 0;
	}

	static int loadTexture(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TSTRING });
		Renderer* p = (Renderer*)lua_touserdata(L, 1);
		const char* filepath = lua_tostring(L, 2);
		SDL_Texture* text = IMG_LoadTexture(p->rnd, filepath);
		lua_pushvalue(L, 1);
		lua_pushlightuserdata(L, text);
		Texture::create(L);
		return 1;
	}

	static int copy(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TUSERDATA, LUA_TTABLE, LUA_TTABLE });
		Renderer* r = (Renderer*)lua_touserdata(L, 1);
		Texture* t = (Texture*)lua_touserdata(L, 2);
		SDL_Rect src;
		int ret = LuaRectPointToRect(L, 3, src);
		if (ret <= 0)
		{
			luaL_error(L, "Bad argument #%d. Rect expected, got %s", 3, lua_typename(L, lua_type(L, 3)));
		}
		SDL_Rect dst;
		ret = LuaRectPointToRect(L, 4, dst);
		if (ret <= 0)
		{
			luaL_error(L, "Bad argument #%d. Rect expected, got %s", 4, lua_typename(L, lua_type(L, 4)));
		}
		SDL_RenderCopy(r->rnd, t->text, &src, &dst);
		return 0;
	}

	static int copyTo(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TUSERDATA, LUA_TTABLE });
		Renderer* r = (Renderer*)lua_touserdata(L, 1);
		Texture* t = (Texture*)lua_touserdata(L, 2);
		SDL_Rect rect;
		int ret = LuaRectPointToRect(L, 3, rect);
		if (ret < 0)
		{
			luaL_error(L, "Bad argument #%d. Point or Rect expected, got %s", 3, lua_typename(L, lua_type(L, 3)));
		}
		if (ret == 1)
		{
			rect.w = t->w;
			rect.h = t->h;
		}
		SDL_RenderCopy(r->rnd, t->text, NULL, &rect);
		return 0;
	}

	static int copyFill(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TUSERDATA, LUA_TTABLE });
		Renderer* r = (Renderer*)lua_touserdata(L, 1);
		Texture* t = (Texture*)lua_touserdata(L, 2);
		SDL_Rect rect;
		int ret = LuaRectPointToRect(L, 3, rect);
		if (ret < 0)
		{
			luaL_error(L, "Bad argument #%d. Point or Rect expected, got %s", 3, lua_typename(L, lua_type(L, 3)));
		}
		if (ret == 1)
		{
			rect.w = t->w;
			rect.h = t->h;
		}
		SDL_RenderCopy(r->rnd, t->text, &rect, NULL);
		return 0;
	}

	static int create(lua_State* L)
	{
		check(L, { LUA_TUSERDATA });
		cout << "In Renderer::create" << endl;
		Renderer* p = (Renderer*)lua_newuserdata(L, sizeof(Renderer));
		lua_getfield(L, LUA_REGISTRYINDEX, "__renderer_mt");
		if (lua_type(L, -1) == LUA_TNIL)
		{
			lua_pop(L, 1);
			lua_newtable(L);
			// GC
			lua_pushcfunction(L, close);
			lua_setfield(L, -2, "__gc");

			// Fields
			lua_newtable(L);
			lua_pushstring(L, "renderer"); lua_setfield(L, -2, "type");
			setfn(L, close, "close");
			setfn(L, update, "update");
			setfn(L, clear, "clear");
			setfn(L, loadTexture, "loadTexture");
			setfn(L, copy, "copy");
			setfn(L, copyTo, "copyTo");

			// Set __index of metatable.
			lua_setfield(L, -2, "__index");

			lua_setfield(L, LUA_REGISTRYINDEX, "__renderer_mt");
			lua_getfield(L, LUA_REGISTRYINDEX, "__renderer_mt");
		}
		lua_setmetatable(L, -2);
		// <20>󶨵<EFBFBD>ǰRenderer<65>Ķ<EFBFBD><C4B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>, <20><>ֹSDL_Window<6F><77><EFBFBD><EFBFBD>ǰ<EFBFBD><C7B0><EFBFBD><EFBFBD>.
		lua_pushvalue(L, 1);
		lua_setuservalue(L, -2);
		// Internal logic
		p->rnd = SDL_CreateRenderer(static_cast<Window*>(lua_touserdata(L, 1))->wnd, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC | SDL_RENDERER_TARGETTEXTURE);
		return 1;
	}
};

int LuaColorToColor(lua_State* L, int index, SDL_Color& c)
{
	if (lua_getfield(L, index, "type") != LUA_TSTRING)
	{
		lua_pop(L, 1);
		return -1;
	}

	const char* type = lua_tostring(L, -1);
	if (strcmp(type, "color") == 0)
	{
		lua_pop(L, 1);
		lua_getfield(L, index, "r");
		c.r = lua_tointeger(L, -1);
		lua_pop(L, 1);
		lua_getfield(L, index, "g");
		c.g = lua_tointeger(L, -1);
		lua_pop(L, 1);
		lua_getfield(L, index, "b");
		c.b = lua_tointeger(L, -1);
		lua_pop(L, 1);
		lua_getfield(L, index, "a");
		c.a = lua_tointeger(L, -1);
		lua_pop(L, 1);

		return 0;
	}
	else
	{
		return -1;
	}
}

struct Font
{
	TTF_Font* font;

	static int close(lua_State* L)
	{
		check(L, { LUA_TUSERDATA });
		cout << "In Font::close" << endl;
		Font* f = (Font*)lua_touserdata(L, 1);
		if (f->font)
		{
			TTF_CloseFont(f->font);
			f->font = nullptr;
		}
		return 0;
	}

	static int renderText(lua_State* L)
	{
		Renderer* r = nullptr;
		Font* f = nullptr;
		const char* text = nullptr;
		SDL_Color c;
		if (lua_gettop(L) >= 4)
		{
			check(L, { LUA_TUSERDATA, LUA_TUSERDATA, LUA_TSTRING, LUA_TTABLE });
			f = (Font*)lua_touserdata(L, 1);
			r = (Renderer*)lua_touserdata(L, 2);
			text = lua_tostring(L, 3);
			if (LuaColorToColor(L, 4, c) < 0)
			{
				luaL_error(L, "Bad argument #%d. Color expected, got %s", 4, lua_typename(L, lua_type(L, 4)));
			}
		}
		else
		{
			check(L, { LUA_TUSERDATA, LUA_TSTRING, LUA_TTABLE });
			f = (Font*)lua_touserdata(L, 1);
			text = lua_tostring(L, 3);
			if (LuaColorToColor(L, 4, c) < 0)
			{
				luaL_error(L, "Bad argument #%d. Color expected, got %s", 4, lua_typename(L, lua_type(L, 4)));
			}
		}

		SDL_Surface* surf = TTF_RenderText_Blended(f->font, text, c);

		if (r)
		{
			SDL_Texture* text = SDL_CreateTextureFromSurface(r->rnd, surf);
			SDL_FreeSurface(surf);
			lua_pushvalue(L, 2);
			lua_pushlightuserdata(L, text);
			Texture::create(L);
		}
		else
		{
			lua_pushlightuserdata(L, surf);
			Surface::create(L);
		}
		return 1;
	}

	static int create(lua_State* L)
	{
		check(L, { LUA_TSTRING, LUA_TNUMBER });
		cout << "In Font::create" << endl;
		Font* f = (Font*)lua_newuserdata(L, sizeof(Font));
		lua_getfield(L, LUA_REGISTRYINDEX, "__font_mt");
		if (lua_type(L, -1) == LUA_TNIL)
		{
			lua_pop(L, 1);
			lua_newtable(L);
			// GC
			lua_pushcfunction(L, close);
			lua_setfield(L, -2, "__gc");

			// Fields
			lua_newtable(L);
			lua_pushstring(L, "font"); lua_setfield(L, -2, "type");
			setfn(L, close, "close");
			setfn(L, renderText, "renderText");

			// Set __index of metatable.
			lua_setfield(L, -2, "__index");

			lua_setfield(L, LUA_REGISTRYINDEX, "__font_mt");
			lua_getfield(L, LUA_REGISTRYINDEX, "__font_mt");
		}
		lua_setmetatable(L, -2);
		const char* filename = lua_tostring(L, 1);
		int fontsz = lua_tointeger(L, 2);
		f->font = TTF_OpenFont(filename, fontsz);

		return 1;
	}
};

Mix_Chunk* Mix_LoadWAVEx(const char* filepath)
{
	SDL_RWops* fileData = SDL_RWFromFile(filepath, "rb");
	if (!fileData)
	{
		std::cout << "Mix_LoadWAVEx() failed to call SDL_RWFromFile().\n\t\"" << SDL_GetError() << "\"" << std::endl;
		return NULL;
	}

	Mix_Chunk* chunk = Mix_LoadWAV_RW(fileData, 1);
	if (!chunk)
	{
		std::cout << "Mix_LoadWAVEx() failed to call Mix_LoadWAV_RW().\n\t\"" << SDL_GetError() << "\"" << std::endl;
		return NULL;
	}

	return chunk;
}

struct Chunk
{
	Mix_Chunk* chunk;

	static int close(lua_State* L)
	{
		check(L, { LUA_TUSERDATA });
		cout << "In Chunk::close" << endl;

		Chunk* c = (Chunk*)lua_touserdata(L, 1);
		if (c->chunk)
		{
			Mix_FreeChunk(c->chunk);
			c->chunk = nullptr;
		}

		return 0;
	}

	static int setVolume(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TNUMBER });
		Chunk* c = (Chunk*)lua_touserdata(L, 1);
		Mix_VolumeChunk(c->chunk, lua_tointeger(L, 2));
		return 0;
	}

	static int create(lua_State* L)
	{
		check(L, { LUA_TSTRING });
		cout << "In Chunk::create" << endl;

		Chunk* c = (Chunk*)lua_newuserdata(L, sizeof(Chunk));
		lua_getfield(L, LUA_REGISTRYINDEX, "__chunk_mt");
		if (lua_type(L, -1) == LUA_TNIL)
		{
			lua_pop(L, 1);
			lua_newtable(L);
			// GC
			lua_pushcfunction(L, close);
			lua_setfield(L, -2, "__gc");

			// Fields
			lua_newtable(L);
			lua_pushstring(L, "chunk"); lua_setfield(L, -2, "type");
			setfn(L, close, "close");
			setfn(L, setVolume, "setVolumne");

			// Set __index of metatable.
			lua_setfield(L, -2, "__index");

			lua_setfield(L, LUA_REGISTRYINDEX, "__chunk_mt");
			lua_getfield(L, LUA_REGISTRYINDEX, "__chunk_mt");
		}
		lua_setmetatable(L, -2);

		const char* filename = lua_tostring(L, 1);
		cout << "LoadWAV: " << filename << endl;
		c->chunk = Mix_LoadWAVEx(filename);
		cout << "Load chunk error: " << SDL_GetError() << endl;

		return 1;
	}
};

struct Music
{
	Mix_Music* music;

	static int close(lua_State* L)
	{
		check(L, { LUA_TUSERDATA });
		cout << "In Music::close" << endl;

		Music* m = (Music*)lua_touserdata(L, 1);
		if (m->music)
		{
			Mix_FreeMusic(m->music);
			m->music = nullptr;
		}
		return 0;
	}

	static int create(lua_State* L)
	{
		check(L, { LUA_TSTRING });
		cout << "In Music::create" << endl;

		Music* m = (Music*)lua_newuserdata(L, sizeof(Music));
		lua_getfield(L, LUA_REGISTRYINDEX, "__music_mt");
		if (lua_type(L, -1) == LUA_TNIL)
		{
			lua_pop(L, 1);
			lua_newtable(L);
			// GC
			lua_pushcfunction(L, close);
			lua_setfield(L, -2, "__gc");

			// Fields
			lua_newtable(L);
			lua_pushstring(L, "music"); lua_setfield(L, -2, "type");
			setfn(L, close, "close");

			// Set __index of metatable.
			lua_setfield(L, -2, "__index");

			lua_setfield(L, LUA_REGISTRYINDEX, "__music_mt");
			lua_getfield(L, LUA_REGISTRYINDEX, "__music_mt");
		}
		lua_setmetatable(L, -2);

		const char* filename = lua_tostring(L, 1);
		m->music = Mix_LoadMUS(filename);
		cout << "Load music error: " << SDL_GetError() << endl;

		return 1;
	}
};

struct MusicPlayer
{
	static int close(lua_State* L)
	{
		check(L, { LUA_TUSERDATA });
		cout << "In MusicPlayer::close" << endl;

		return 0;
	}

	static int playMusic(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TUSERDATA });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		Music* m = (Music*)lua_touserdata(L, 2);
		cout << "Play music ret: " << Mix_PlayMusic(m->music, 1) << " " << SDL_GetError() << endl;
		return 0;
	}

	static int resumeMusic(lua_State* L)
	{
		check(L, { LUA_TUSERDATA });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		Mix_ResumeMusic();
		return 0;
	}

	static int stopMusic(lua_State* L)
	{
		check(L, { LUA_TUSERDATA });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		Mix_HaltMusic();
		return 0;
	}

	static int pauseMusic(lua_State* L)
	{
		check(L, { LUA_TUSERDATA });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		Mix_PauseMusic();
		return 0;
	}

	static int rewindMusic(lua_State* L)
	{
		check(L, { LUA_TUSERDATA });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		Mix_RewindMusic();
		return 0;
	}

	static int fadeInMusic(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TUSERDATA , LUA_TNUMBER });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		Music* m = (Music*)lua_touserdata(L, 2);
		cout << "Fade in music ret: " << Mix_FadeInMusic(m->music, 1, lua_tointeger(L, 3)) << " " << SDL_GetError() << endl;
		return 0;
	}

	static int fadeInMusicPos(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TUSERDATA , LUA_TNUMBER, LUA_TNUMBER });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		Music* m = (Music*)lua_touserdata(L, 2);
		cout << "Fade in music ret: " << Mix_FadeInMusicPos(m->music, 1, lua_tointeger(L, 3), lua_tonumber(L, 4)) << " " << SDL_GetError() << endl;
		return 0;
	}

	static int fadeOutMusic(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TNUMBER });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		cout << "Fade out music ret: " << Mix_FadeOutMusic(lua_tointeger(L, 2)) << " " << SDL_GetError() << endl;
		return 0;
	}

	static int setMusicVolume(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TNUMBER });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		Mix_VolumeMusic(lua_tointeger(L, 2));
		return 0;
	}

	static int setMusicPos(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TNUMBER });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		Mix_SetMusicPosition(lua_tonumber(L, 2));
		return 0;
	}

	static int isPlayingMusic(lua_State* L)
	{
		check(L, { LUA_TUSERDATA });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		lua_pushboolean(L, Mix_PlayingMusic());
		return 1;
	}

	static int isPausedMusic(lua_State* L)
	{
		check(L, { LUA_TUSERDATA });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		lua_pushboolean(L, Mix_PausedMusic());
		return 1;
	}

	static int isFadingMusic(lua_State* L)
	{
		check(L, { LUA_TUSERDATA });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		int ret = 0;
		switch (Mix_FadingMusic())
		{
		case MIX_NO_FADING:
			ret = 0;
			break;
		case MIX_FADING_OUT:
			ret = -1;
			break;
		case MIX_FADING_IN:
			return 1;
		}
		lua_pushinteger(L, ret);
		return 1;
	}

	static int playChannel(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TUSERDATA, LUA_TNUMBER, LUA_TNUMBER});
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		Chunk* c = (Chunk*)lua_touserdata(L, 2);
		cout << "Play channel ret: " << Mix_PlayChannel(lua_tointeger(L, 3), c->chunk, lua_tointeger(L, 4)) << " " << SDL_GetError() << endl;
		return 0;
	}

	static int fadeInChannel(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TUSERDATA, LUA_TNUMBER, LUA_TNUMBER, LUA_TNUMBER });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		Chunk* c = (Chunk*)lua_touserdata(L, 2);
		Mix_FadeInChannel(lua_tointeger(L, 3), c->chunk, lua_tointeger(L, 4), lua_tointeger(L, 5));
		return 0;
	}

	static int fadeOutChannel(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TNUMBER, LUA_TNUMBER });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		Mix_FadeOutChannel(lua_tointeger(L, 2), lua_tointeger(L, 3));
		return 0;
	}

	static int stopChannel(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TNUMBER });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		Mix_HaltChannel(lua_tointeger(L, 2));
		return 0;
	}

	static int resumeChannel(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TNUMBER });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		Mix_Resume(lua_tointeger(L, 2));
		return 0;
	}

	static int pauseChannel(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TNUMBER });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		Mix_Pause(lua_tointeger(L, 2));
		return 0;
	}

	static int isPlayingChannel(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TNUMBER });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		lua_pushinteger(L, Mix_Playing(lua_tointeger(L, 2)));
		return 1;
	}

	static int isPausedChannel(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TNUMBER });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		lua_pushinteger(L, Mix_Paused(lua_tointeger(L, 2)));
		return 1;
	}

	static int isFadingChannel(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TNUMBER });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		int ret = 0;
		switch (Mix_FadingChannel(lua_tointeger(L, 2)))
		{
		case MIX_NO_FADING:
			ret = 0;
			break;
		case MIX_FADING_OUT:
			ret = -1;
			break;
		case MIX_FADING_IN:
			return 1;
		}
		lua_pushinteger(L, ret);
		return 1;
	}

	static int setChannelVolume(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TNUMBER, LUA_TNUMBER });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		Mix_Volume(lua_tointeger(L, 2), lua_tointeger(L, 3));
		return 0;
	}

	static int setChannelDistance(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TNUMBER, LUA_TNUMBER });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		Mix_SetDistance(lua_tointeger(L, 2), lua_tointeger(L, 3));
		return 0;
	}

	static int setChannelPosition(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TNUMBER, LUA_TNUMBER, LUA_TNUMBER });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		Mix_SetPosition(lua_tointeger(L, 2), lua_tointeger(L, 3), lua_tointeger(L, 4));
		return 0;
	}

	static int setChannelPanning(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TNUMBER, LUA_TNUMBER, LUA_TNUMBER });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		Mix_SetPanning(lua_tointeger(L, 2), lua_tointeger(L, 3), lua_tointeger(L, 4));
		return 0;
	}

	static int setTotalChannel(lua_State* L)
	{
		check(L, { LUA_TUSERDATA, LUA_TNUMBER });
		MusicPlayer* p = (MusicPlayer*)lua_touserdata(L, 1);
		Mix_AllocateChannels(lua_tointeger(L, 2));
		return 0;
	}

	static int create(lua_State* L)
	{
		cout << "In MusicPlayer::create" << endl;

		MusicPlayer* m = (MusicPlayer*)lua_newuserdata(L, sizeof(MusicPlayer));
		lua_getfield(L, LUA_REGISTRYINDEX, "__musicplayer_mt");
		if (lua_type(L, -1) == LUA_TNIL)
		{
			lua_pop(L, 1);
			lua_newtable(L);
			// GC
			lua_pushcfunction(L, close);
			lua_setfield(L, -2, "__gc");

			// Fields
			lua_newtable(L);
			lua_pushstring(L, "musicplayer"); lua_setfield(L, -2, "type");
			setfn(L, close, "close");
			setfn(L, playMusic, "playMusic");
			setfn(L, resumeMusic, "resumeMusic");
			setfn(L, pauseMusic, "pauseMusic");
			setfn(L, stopMusic, "stopMusic");
			setfn(L, rewindMusic, "rewindMusic");
			setfn(L, fadeInMusic, "fadeInMusic");
			setfn(L, fadeOutMusic, "fadeOutMusic");
			setfn(L, fadeInMusicPos, "fadeInMusicPos");

			setfn(L, setMusicVolume, "setMusicVolume");
			setfn(L, setMusicPos, "setMusicPos");

			setfn(L, isPlayingMusic, "isPlayingMusic");
			setfn(L, isPausedMusic, "isPausedMusic");
			setfn(L, isFadingMusic, "isFadingMusic");

			setfn(L, playChannel, "playChannel");
			setfn(L, resumeChannel, "resumeChannel");
			setfn(L, pauseChannel, "pauseChannel");
			setfn(L, stopChannel, "stopChannel");
			setfn(L, fadeInChannel, "fadeInChannel");
			setfn(L, fadeOutChannel, "fadeOutChannel");

			setfn(L, setChannelVolume, "setChannelVolume");
			setfn(L, setChannelDistance, "setChannelDistance");
			setfn(L, setChannelPosition, "setChannelPosition");
			setfn(L, setChannelPanning, "setChannelPanning");
			setfn(L, setTotalChannel, "setTotalChannel");

			setfn(L, isPlayingChannel, "isPlayingChannel");
			setfn(L, isPausedChannel, "isPausedChannel");
			setfn(L, isFadingChannel, "isFadingChannel");

			// Set __index of metatable.
			lua_setfield(L, -2, "__index");

			lua_setfield(L, LUA_REGISTRYINDEX, "__musicplayer_mt");
			lua_getfield(L, LUA_REGISTRYINDEX, "__musicplayer_mt");
		}
		lua_setmetatable(L, -2);

		return 1;
	}
};

struct LibFS
{
	static int listdir(lua_State* L)
	{
		check(L, { LUA_TSTRING });
		vector<FileInfo> vec = ListDir(lua_tostring(L, 1));
		int sz = vec.size();
		lua_newtable(L);
		for (lua_Integer i = 0; i < sz; i++)
		{
			const FileInfo& info = vec[i];
			lua_newtable(L);
			lua_pushstring(L, info.name.c_str());
			lua_setfield(L, -2, "name");
			lua_pushstring(L, info.type ? "dir" : "file");
			lua_setfield(L, -2, "type");
			lua_pushinteger(L, info.size);
			lua_setfield(L, -2, "size");
			lua_seti(L, -2, i + 1);
		}
		return 1;
	}
	static int create(lua_State* L)
	{
		lua_newtable(L);
		setfn(L, listdir, "listdir");

		return 1;
	}
};

#define reg_in_lua(L, cfunc, name) lua_pushcfunction(L, cfunc); lua_setglobal(L, name)

void check_init(lua_State* L, const char* name, int ret, int expected = 0)
{
	if (ret != expected)
	{
		luaL_error(L, "Failed to initialize %s. ret: %d. expected: %d. SDLError: %s", name, ret, expected, SDL_GetError());
	}
}

void _Global_On_Music_Finished()
{
	SDL_Event e;
	e.type = SDL_USEREVENT;
	e.user.code = 1003;
	SDL_PushEvent(&e);
}

void _Global_On_Channel_Finished(int channel)
{
	SDL_Event e;
	e.type = SDL_USEREVENT;
	e.user.code = 1004;
	e.user.data1 = new int(channel);
	SDL_PushEvent(&e);
}

static int setTimeout(lua_State* L)
{
	check(L, { LUA_TFUNCTION, LUA_TNUMBER }); // setTimeout(cb: function, ms: number)

	LuaTimerCallbackData* pd = new LuaTimerCallbackData();
	pd->p = nullptr;
	pd->type = 0;
	pd->id = SDL_AddTimer(lua_tointeger(L, 2), LuaTimerCallbackGate, pd);

	lua_pushlightuserdata(L, &setTimeout);
	if (lua_gettable(L, LUA_REGISTRYINDEX) != LUA_TTABLE)
	{
		lua_pop(L, 1);

		lua_pushlightuserdata(L, &setTimeout);
		lua_newtable(L);
		lua_pushvalue(L, 1);
		lua_seti(L, -2, pd->id);  // { [timerID] = callback }

		lua_settable(L, LUA_REGISTRYINDEX);  // registry[&setTimeout] = timerCallbackTable
	}
	else
	{
		lua_pushvalue(L, 1);
		lua_seti(L, -2, pd->id);  // timerCallbackTable[timerID] = callback
	}
	return 0;
}

static int setInterval(lua_State* L)
{
	check(L, { LUA_TFUNCTION, LUA_TNUMBER }); // setTimeout(cb: function, ms: number)

	LuaTimerCallbackData* pd = new LuaTimerCallbackData();
	pd->p = nullptr;
	pd->type = 1;
	pd->id = SDL_AddTimer(lua_tointeger(L, 2), LuaTimerCallbackGate, pd);

	lua_pushlightuserdata(L, &setTimeout);
	if (lua_gettable(L, LUA_REGISTRYINDEX) != LUA_TTABLE)
	{
		lua_newtable(L);
		lua_pushvalue(L, 1);
		lua_seti(L, -2, pd->id);  // { [timerID] = callback }

		lua_pushlightuserdata(L, &setTimeout);
		lua_settable(L, LUA_REGISTRYINDEX);  // registry[&setTimeout] = timerCallbackTable
	}
	else
	{
		lua_pushvalue(L, 1);
		lua_seti(L, -2, pd->id);  // timerCallbackTable[timerID] = callback
	}
	return 0;
}

int InitEngine(lua_State* L)
{
	int ret;
	ret = SDL_Init(SDL_INIT_EVERYTHING);
	check_init(L, "SDL", ret);
	ret = IMG_Init(IMG_INIT_JPG | IMG_INIT_PNG);
	check_init(L, "IMG", ret, IMG_INIT_JPG | IMG_INIT_PNG);
	ret = TTF_Init();
	check_init(L, "TTF", ret);
	ret = Mix_Init(MIX_INIT_MP3 | MIX_INIT_MOD | MIX_INIT_OGG );
	check_init(L, "MIX", ret, MIX_INIT_MP3 | MIX_INIT_MOD | MIX_INIT_OGG);

	ret = Mix_OpenAudio(44100, MIX_DEFAULT_FORMAT, 2, 512);
	check_init(L, "AUDIO", ret);
	Mix_AllocateChannels(16);
	Mix_HookMusicFinished(_Global_On_Music_Finished);
	Mix_ChannelFinished(_Global_On_Channel_Finished);

	reg_in_lua(L, Window::create, "Window");
	reg_in_lua(L, Renderer::create, "Renderer");
	reg_in_lua(L, Font::create, "Font");
	reg_in_lua(L, Chunk::create, "Chunk");
	reg_in_lua(L, Music::create, "Music");
	reg_in_lua(L, MusicPlayer::create, "MusicPlayer");

	// Global functions
	reg_in_lua(L, ConvertMusicAsync, "ConvertMusic");
	reg_in_lua(L, setTimeout, "SetTimeout");
	reg_in_lua(L, setInterval, "SetInterval");
	
	// Global Library
	LibFS::create(L); lua_setglobal(L, "fs");

	// Registry table
	lua_pushlightuserdata(L, &StartEngine);
	lua_newtable(L);
	lua_settable(L, LUA_REGISTRYINDEX);

	return 0;
}

int LuaRunCallback(lua_State* L, int nargs, int nresults = LUA_MULTRET)
{
	int ret = lua_pcall(L, nargs, nresults, 0);
	if (ret)
	{
		switch (ret)
		{
		case LUA_ERRRUN:
			cout << "LuaRunError: " << lua_tostring(L, -1) << endl;
			break;
		case LUA_ERRMEM:
			cout << "LuaMemError: " << lua_tostring(L, -1) << endl;
			break;
		case LUA_ERRERR:
			cout << "LuaRecursiveError: " << lua_tostring(L, -1) << endl;
			break;
		case LUA_ERRGCMM:
			cout << "LuaGCError: " << lua_tostring(L, -1) << endl;
			break;
		default:
			cout << "LuaError: " << lua_tostring(L, -1) << endl;
			break;
		}
		lua_pop(L, 1);
		return -1;
	}
	return 0;
}

int StartEngine(lua_State* L)
{
	// The Event Loop
	bool running = true;

	SDL_Event e;
	while (running && SDL_WaitEvent(&e))
	{
		switch (e.type)
		{
			case SDL_MOUSEBUTTONDOWN:
			{
				lua_pushlightuserdata(L, SDL_GetWindowFromID(e.button.windowID));
				lua_gettable(L, LUA_REGISTRYINDEX);
				if (lua_getfield(L, -1, "onmousedown") != LUA_TNIL)
				{
					lua_pushnumber(L, e.button.x);
					lua_pushnumber(L, e.button.y);
					lua_pushnumber(L, e.button.button);
					const char* arr[8];
					int ret = GetMouseState(arr, e.button.state);
					lua_newtable(L);
					for (int i = 0; i < ret; i++)
					{
						lua_pushboolean(L, 1);
						lua_setfield(L, -2, arr[i]);
					}
					LuaRunCallback(L, 4);
				}
				else lua_pop(L, 1);
				lua_pop(L, 1);
				break;
			}
			case SDL_MOUSEBUTTONUP:
			{
				lua_pushlightuserdata(L, SDL_GetWindowFromID(e.button.windowID));
				lua_gettable(L, LUA_REGISTRYINDEX);
				if (lua_getfield(L, -1, "onmouseup") != LUA_TNIL)
				{
					lua_pushnumber(L, e.button.x);
					lua_pushnumber(L, e.button.y);
					lua_pushnumber(L, e.button.button);
					const char* arr[8];
					int ret = GetMouseState(arr, e.button.state);
					lua_newtable(L);
					for (int i = 0; i < ret; i++)
					{
						lua_pushboolean(L, 1);
						lua_setfield(L, -2, arr[i]);
					}
					LuaRunCallback(L, 4);
				}
				else lua_pop(L, 1);
				lua_pop(L, 1);
				break;
			}
			case SDL_MOUSEMOTION:
			{
				lua_pushlightuserdata(L, SDL_GetWindowFromID(e.motion.windowID));
				lua_gettable(L, LUA_REGISTRYINDEX);
				if (lua_getfield(L, -1, "onmousemove") != LUA_TNIL)
				{
					lua_pushnumber(L, e.motion.x);
					lua_pushnumber(L, e.motion.y);
					lua_pushnumber(L, e.motion.xrel);
					lua_pushnumber(L, e.motion.yrel);
					const char* arr[8];
					int ret = GetMouseState(arr, e.button.state);
					lua_newtable(L);
					for (int i = 0; i < ret; i++)
					{
						lua_pushboolean(L, 1);
						lua_setfield(L, -2, arr[i]);
					}
					LuaRunCallback(L, 5);
				}
				else lua_pop(L, 1);
				lua_pop(L, 1);
				break;
			}
			case SDL_QUIT:
			{
				running = 0;

				lua_pushlightuserdata(L, &StartEngine);
				lua_gettable(L, LUA_REGISTRYINDEX);

				if (lua_getfield(L, -1, "onquit") != LUA_TNIL)
				{
					if (!LuaRunCallback(L, 0, 1))
					{
						if (lua_type(L, -1) == LUA_TBOOLEAN && !lua_toboolean(L, -1))
						{
							running = 1;
						}
						lua_pop(L, 1);
					}
				}
				else lua_pop(L, 1);

				lua_pop(L, 1);
				break;
			}
			case SDL_KEYDOWN:
			{
				lua_pushlightuserdata(L, SDL_GetWindowFromID(e.key.windowID));
				lua_gettable(L, LUA_REGISTRYINDEX);
				if (lua_getfield(L, -1, "onkeydown") != LUA_TNIL)
				{
					lua_pushnumber(L, e.key.keysym.sym);
					LuaRunCallback(L, 1);
				}
				else lua_pop(L, 1);
				lua_pop(L, 1);
				break;
			}
			case SDL_KEYUP:
			{
				lua_pushlightuserdata(L, SDL_GetWindowFromID(e.key.windowID));
				lua_gettable(L, LUA_REGISTRYINDEX);
				if (lua_getfield(L, -1, "onkeyup") != LUA_TNIL)
				{
					lua_pushnumber(L, e.key.keysym.sym);
					LuaRunCallback(L, 1);
				}
				else lua_pop(L, 1);
				lua_pop(L, 1);
				break;
			}
			case SDL_USEREVENT:
			{
				switch (e.user.code)
				{
				case 1001:
				{
					// <20><>ʱ<EFBFBD><CAB1><EFBFBD>ص<EFBFBD>
					LuaTimerCallbackData* pd = (LuaTimerCallbackData*)e.user.data1;
					lua_pushlightuserdata(L, &setTimeout);
					lua_gettable(L, LUA_REGISTRYINDEX);  // registry[&setTimeout]
					lua_geti(L, -1, pd->id);  // registry[&setTimeout][timerID]
					delete pd;
					LuaRunCallback(L, 0);
					lua_pop(L, 1);
					break;
				}
				case 1002:
				{
					// ȫ<>ֻص<D6BB>, <20>첽<EFBFBD><ECB2BD><EFBFBD><EFBFBD><EFBFBD>޷<EFBFBD><DEB7><EFBFBD>ֵ
					lua_pushfstring(L, "cb%d", *(int*)e.user.data1);
					lua_gettable(L, LUA_REGISTRYINDEX);
					delete e.user.data1;
					LuaRunCallback(L, 0);
					break;
				}
				case 1003:
				
					// <20><><EFBFBD>ֲ<EFBFBD><D6B2><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
					lua_pushlightuserdata(L, &StartEngine);
					lua_gettable(L, LUA_REGISTRYINDEX);
					if (lua_getfield(L, -1, "onmusicover") != LUA_TNIL)
					{
						LuaRunCallback(L, 0);
					}
					else lua_pop(L, 1);
					lua_pop(L, 1);
					break;
				}
				case 1004:
				{
					// Ƶ<><C6B5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
					lua_pushlightuserdata(L, &StartEngine);
					lua_gettable(L, LUA_REGISTRYINDEX);
					if (lua_getfield(L, -1, "onchannelover") != LUA_TNIL)
					{
						lua_pushinteger(L, *(int*)e.user.data1);
						delete e.user.data1;
						LuaRunCallback(L, 1);
					}
					else lua_pop(L, 1);
					lua_pop(L, 1);
					break;
				}
				break;
			}
			default:
			{
				cout << e.type << endl;
			}
		}
	}

	return 0;
}

int StopEngine()
{
	Mix_CloseAudio();
	Mix_Quit();
	TTF_Quit();
	IMG_Quit();
	SDL_Quit();

	return 0;
}