Provides an overview and history of various shading languages.

A freeware shader development IDE for Windows; aids in developing vertex and fragment (pixel) shaders in GLSL. Includes tools, tutorials, and sample Space Invaders app (requires VC++ 4).

PDF comparing HLSL, GLSL and Cg. Includes diagrams and code samples.

Specification for OpenGL's geometry shader APIs. Geometry shaders live in between vertex and fragment shaders in OpenGL's pipeline, and are used to introduce new primitives based on incoming vertices. Detailed documentation and pipeline diagram.

Powerpoint presentation on 3D shading languages. Includes coding comparisons and pros/cons of various shading languages.

Compares the APIs, workflow and variable types between GLSL and Cg.

A tutorial on the basics of shading theory in 3D computer graphics.

Dr. Jian Huang's presentation on OpenGL shaders; includes history, overview, rendering examples, and comparisons of ARB vs Cg.

Whitepaper on using high-level shading languages to provide non-linear image filtering. Includes an abstract, diagrams and metacode.

GLSL and ARB examples of texture mapping and lighting; includes code examples and screen shots.