system

var Gravity *gravity = &gravity{
	query: donburi.NewQuery(
		filter.Contains(
			component.Velocity,
			component.Gravity,
		)),
}

var Render = &render{
	query: ecs.NewQuery(
		layers.LayerBunnies,
		filter.Contains(
			component.Position,
			component.Hue,
			component.Sprite,
		)),
}

var Velocity = &velocity{
	query: donburi.NewQuery(
		filter.Contains(
			component.Position,
			component.Velocity,
		)),
}