Room new_Room(SDL_Renderer *renderer, ResourceManager rm, Window window, Sprite bg, char *mapname)
{
    Room ret = malloc(sizeof(struct Room_s));
    assert(renderer);
    ret->renderer = renderer;
    assert(window);
    ret->window = window;
    ret->toReact= new_List(0);
    ret->entities = new_List(0);
    ret->background = bg;

    ret->gravity = cpv(0, -200);

    ret->sox = ret->soy = 0;

    ret->space = cpSpaceNew();
    cpSpaceSetGravity(ret->space, ret->gravity);

    // room's ready, now to populate it

    json_t *maproot, *entities;
    json_error_t jerror;

    maproot = json_load_file(mapname, 0, &jerror);
    json_check(maproot, jerror);
    assert(json_is_object(maproot));

    ret->width = json_integer_value(json_object_get(maproot, "w"));
    ret->height = json_integer_value(json_object_get(maproot, "h"));
    entities = json_object_get(maproot, "entities");


    for (unsigned int i = 0; i < json_array_size(entities); i++)
    {
    json_t *elem, *args, *typeo;
    char *type;
    elem = json_array_get(entities, i);

    assert(json_is_object(elem));

    typeo = json_object_get(elem, "type");
    assert(json_is_string(typeo));

    type = (char*)json_string_value(typeo);

    if (strcmp(type, "player") == 0)
        List_enqueue(ret->entities, new_Player(rm, ret,
                            json_integer_value(
                            json_object_get(elem, "x")),
                            json_integer_value(
                            json_object_get(elem, "y"))));
    else if (strcmp(type, "box") == 0)
        List_enqueue(ret->entities, new_Box(rm, ret,
                            json_integer_value(
                            json_object_get(elem, "x")),
                            json_integer_value(
                            json_object_get(elem, "y")),
                             json_real_value(
                             json_object_get(elem, "angle"))));
    else if (strcmp(type, "platform") == 0)
        List_enqueue(ret->entities, new_Platform(rm, ret,
                            json_integer_value(
                            json_object_get(elem, "x")),
                            json_integer_value(
                            json_object_get(elem, "y")),
                             json_real_value(
                             json_object_get(elem, "angle"))));
    }

    return ret;
}