#define MAKE_SDL_TYPE(L, meta, index, flib)         \
{                                                   \
  (void)luaL_newmetatable(L, meta);                 \
  lua_pushliteral(L, "__index");                    \
  lua_pushcfunction(L, index);                      \
  lua_rawset(L, -3);                                \
  luaL_register(L, NULL, flib);                     \
}