gistfile1.go

func (r *RenderSystem) Begin() {
	r.platform.renderer.renderer.Clear()
}

func (r *RenderSystem) Process() {
	for _, entity := range r.entities {
		aspect := entity.GetComponent(new(AspectComponent)).(*AspectComponent)
		sprite := entity.GetComponent(new(SpriteComponent)).(*SpriteComponent)

		src := sdl.Rect{0, 0, 512, 512}

		var w, h int
		sdl.QueryTexture(sprite.tex, nil, nil, &w, &h)

		dst := sdl.Rect{aspect.x, aspect.y, int32(w), int32(h)}
		r.platform.renderer.renderer.Copy(sprite.tex, &src, &dst)
	}
}

func (r *RenderSystem) End() {
	r.platform.renderer.renderer.Present()
}