fn init_ecs() *ecs.world_t {

const InitArgs = struct {
    enable_rest: bool = true,
    enable_monitor: bool = true,
};
fn init_ecs(args: InitArgs) *ecs.world_t {

    if (args.enable_monitor) {
        _ = ecs.import_c(world, ecs.FlecsMonitorImport, "FlecsMonitor");
    }
    if (args.enable_rest) {
        const EcsRest = ecs.lookup_fullpath(world, "flecs.rest.Rest");
        const EcsRestVal: ecs.EcsRest = .{};
        _ = ecs.set_id(world, EcsRest, EcsRest, @sizeOf(ecs.EcsRest), &EcsRestVal);
    }

    _ = singleton(world, ecs.EcsRest, .{});

        const building = rl.Rectangle{ .x = x, .y = 0, .width = width, .height = height };

        const y = screen_height - 130.0 - height;
        const building = rl.Rectangle{ .x = x, .y = y, .width = width, .height = height };

    const world = init_ecs();

    const world = init_ecs(.{});

pub const ecs_app_desc_t = extern struct {
    target_fps: f32 = 0,
    delta_time: f32 = 0,
    threads: c_int = 0,
    frames: c_int = 0,
    enable_rest: bool = false,
    enable_monitor: bool = false,
    init: ?*anyopaque = null,
    ctx: ?*anyopaque = null,
};
extern "c" fn ecs_app_run(world: *ecs.world_t, app_desc: *ecs_app_desc_t) c_int;
pub inline fn app_run(world: *ecs.world_t, app_desc: *ecs_app_desc_t) i32 {
    return ecs_app_run(world, app_desc);
}
pub inline fn singleton(world: *ecs.world_t, comptime T: type, val: T) ecs.entity_t {
    return ecs.set(world, ecs.id(T), T, val);
}
pub inline fn get_singleton_mut(world: *ecs.world_t, comptime T: type) ?*T {
    return ecs.get_mut(world, ecs.id(T), T);
}