Method Less

common/render.go:158–199

(i, j int)

}

func (r renderEntityList) Less(i, j int) bool {
	// Sort by shader-pointer if they have the same zIndex
	if r[i].RenderComponent.zIndex != r[j].RenderComponent.zIndex {
		return r[i].RenderComponent.zIndex < r[j].RenderComponent.zIndex
	}

	p1, p2 := getShadersPtr(r[i].RenderComponent.shader, r[j].RenderComponent.shader)
	if p1 != p2 {
		return p1 < p2
	}

	switch r[i].RenderComponent.Drawable.(type) {
	// Tiles can either be as a spriteSheet or as separate image
	// if we sort them by texture and they're saved as separate images,
	// sorting by texture messes up rendering.
	case *Tile:
		// NO-OP
	default:
		t1, t2 := uintptr(unsafe.Pointer(r[i].RenderComponent.Drawable.Texture())), uintptr(unsafe.Pointer(r[j].RenderComponent.Drawable.Texture()))
		if t1 != t2 {
			return t1 < t2
		}
	}

	// Sort by minFilter if they're the same magFilter
	mag1, mag2 := r[i].RenderComponent.magFilter, r[j].RenderComponent.magFilter
	if mag1 != mag2 {
		return mag1 < mag2
	}

	// Sort by position if they're the same minFilter
	min1, min2 := r[i].RenderComponent.minFilter, r[j].RenderComponent.minFilter
	if min1 != min2 {
		return min1 < min2
	}

	if r[i].Position.Y != r[j].Position.Y {
		return r[i].Position.Y < r[j].Position.Y
	}

	return r[i].Position.X < r[j].Position.X
}

func (r renderEntityList) Swap(i, j int) {
	r[i], r[j] = r[j], r[i]