Heat Haze

The goal is to implement a good-looking heat haze effect.

The general idea is:

1. Render all particles into a buffer
   
2. Render the world
   
3. Use the information from step one to generate a grey map (the map is generated by the shader) which is used to calculate the vectors which are used to disturb the picture.
   

What I need to do is create a class that handels all this steps for every heat haze enabled particle system on the screen. I call this class "HeatParticleManager".
Here's a small UML Diagram to get the general idea: