Advanced custom shaders.

[pepper-jelly]

Is it possible to make a multipass shader? It would be key for various effects.

e.g. read texture -> do something -> store texture -> read stored texture -> do something -> return final color

I've tried using imageStore/imageLoad and binding buffers, but this just gives me a blank screen. I've also thought about for loop to store each texel in a 2D array col[][], but the potential overhead.