github/linguist — pull request #599 by larsbrinkhoff (2013-07-31 10:39:33+00:00)
Title: Add OpenGL Shading Language.

Add support for the OpenGL Shading Language.

Encounters in the wild:
http://github.com/larsbrinkhoff/glsl-sphere-tracing
http://github.com/b01xy/glsl/tree/master/Atelier_Pure-Data_Gem_GLSL