public override void Execute()
 {
     if (last == this)
     {
         return;
     }
     if (stateCache.Framebuffer != Framebuffer)
     {
         Framebuffer.Begin();
         stateCache.Framebuffer = Framebuffer;
     }
     last = this;
 }
 public static void ResetState()
 {
     GL.BindFramebuffer(FramebufferTarget.Framebuffer, 0);
     stateCache.Framebuffer = null;
     last = null;
 }