Graphics Programming 11

Well, 11 is just a small tweak of 10.

The whole post processing thing is just rendering the entire screen into a texture and then do tricks on it.
The key is to use a plane and set its coordinates the same as the screen coordinate. As for UI, its the same,  you can just change its vertex positions in the shader by using uniform values based on the values you set in the config file.

Here is the screenshot of the 11:

And here is the code:
Graphics11