Blender Game Engine : Rendering with GLSL

I just found this post on blenderartists.org from Martins Upitis where he is showing his work with BGE (Blender Game Engine) and GLSL 2D filters. See by yourself, I think it’s looking great ! At this point, I thing he did use 4 well known filter which are SSAO (Screen Space Ambiant Occlusion), SunRays (mostly known as GodRays I think), chromatic aberration(RGB Distortion), DoF (Depth of Field) !! The four combined gives a really nice result, but so far a bit slow as I believe (30 fps with a really good computer). He probably could make some optimization, but it looks really interesting. I’m really getting into this GLSL thing, which is a bit hard for me and my small tiny brain, but I’ll sure take a look at it when I’ll have more time