Some experiments with GTA V style lensflares! I really like this effect
so I think I'm gonna keep it after extending it with some regular
polygonal-shaped diffractions. In the video, the banding of the sky is
severe but ingame, it's not so bad - after I add a simple dither, there
won't be any problems. As you can see on the (insane) fps number,
performance is better than ever!