Night Vision effect

Implementing the night vision effect is pretty simple.

What we have to do is:

1. Read current frame buffer content,
2. Sample a noise texture using time variant texture coordinates (I modify them by adding sin(milliseconds / 1000.0f) to them),
3. Add both vectors,
   
4. Multiply everything with green colour i.e. (0.0f, 1.0f, 0.0f) vector.

I used this simple procedure to achieve this in nGENE (well jpg compression made it look worse than it really does):