Heat Haze

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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: