The OpenGL Shading Language, a high-level procedural shading language for OpenGL, is the most important new development in graphics programming to emerge in years. OpenGL is the leading cross-platform 3D-graphics API, and the OpenGL Shading Language allows developers to take total control over the most important stages of the graphics-processing pipeline.-The OpenGL Shading Language, a high-level procedural shading language for O penGL. is the most important new development in graphi cs programming to emerge in years. OpenGL is the leading cross-platform 3D-graphics API. and the OpenGL Shading Language allows develop ers to take total control over the most importan t stages of the graphics-processing pipeline.