glsl-syntax

Copperbox revision 2712.

I've picked up on the old GL Shading Language parser and pretty printer. It will be useful to change the pretty printer to use hpj-pretty-expr as the GL Shading Language is big enough to be considered industrial strength.

Clearly I hadn't discovered Hughes lists when I first worked on GLSL as I was using Data.Seq in the syntax tree so I could build with snoc-ing.

There is some connection between shading languages and Csound and Supercollider instrument languages. Both types of language essentially describe what goes on in a single iteration of a rendering loop.