Post Processing

I wanted to expose the post processing attributes to coders. The things like saturation, brightness, gamma, white point, contrast, tint. It turns out that it's pretty much impossible to do it using the built in stuff because the tools generate a look up texture for the colour correction, so it's not just a case of changing a few variables.

So I figured we probably need a way to create our own post process steps. We can already create our own simple shaders, so only really needed a way to draw a screen quad at the right point in the frame render.

So that was easy enough. I'm not a shader guy but I managed to get DOF and saturation DOF working without much trouble, so pretty I'm pretty interested to see what people come up with here.