func start(f func(*ebiten.Image) error, width, height int, scale float64, title string) error {
chError = ebiten.RunWithoutMainLoop(f, width, height, scale, title)
return nil
}
// Start starts the game and returns immediately.
//
// Different from ebiten.Run, this invokes only the game loop and not the main (UI) loop.
func Start(f func(*ebiten.Image) error, width, height, scale int, title string) (EventDispatcher, error) {
chError = ebiten.RunWithoutMainLoop(f, width, height, scale, title)
return &eventDispatcher{
touches: map[int]position{},
}, nil
}