This is the prototype that I used to create this feature: https://github.com/coelckers/gzdoom/com ... 00ac3f6889
This shader essentially allows much greater flexibility over the brightness/gamma presentation than GZDoom/Raze allows internally. Including allowing values that turn the image negative.
Its main purpose is to demonstrate how to define linked uniform CVars in gldefs.txt - which is preferred over using a tick function since now it does not need to run every frame, not to mention makes it actually usable in Raze.
