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Wikipedia: GLSL - http://en.wikipedia.org/wiki/GLSL
A brief history, list of GLSL datatypes and explanation of variable types. |
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GLSL Tutorial - http://www.lighthouse3d.com/opengl/glsl/
Primer for GLSL beginners: pipeline diagrams, documentation and sample code. |
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The OpenGL Shading Language Specification - http://www.opengl.org/registry/doc/GLSLangSpec.Full.1.20.8.pdf
Detailed documentation on the GLSL language. Includes standard variables, constants and functions. |
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GLSL Quick Reference Guide - http://mew.cx/glsl_quickref.pdf
Chart listing standard GLSL variables and constants. |
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GLSL - An Introduction - http://nehe.gamedev.net/data/articles/article.asp?article=21
A quick introduction to GLSL, including code snippets for common shader operations. |