Allow preprocessor directives in GLSL shader blocks

[nphollon]

I would like to make use of WebGL's frag depth extension in my code. In Elm, the syntax for this would look like

fragmentShader = [glsl|
  #extension GL_EXT_frag_depth : require
  ...
|]

There are a few additional preprocessor directives for GLSL. Unfortunately, the Elm compiler throws an error if I try to begin a line with #.

The syntax works fine with WebGL.unsafeShader, but it would be nicer to be able to use a shader block instead.

[evancz]

We rely on https://hackage.haskell.org/package/language-glsl to parse the GLSL code and get out the information we need. I think they'd have to add support for this there.

[evancz]

Have you tried asking them about it on their github repo? Should we close this? What's up?

[nphollon]

Looks like there is already an issue open on their repo, although it's been dormant for over a year. I will try to get it fixed on their end. Thanks for your help!