Cg and OpenGL Integration

摘要

Modern programmable graphics cards allow custom vertex and fragment programs to replace the fixed-function vertex and fragment stages of the graphics pipeline. Vertex and fragment programs can be written in low-level assembly languages or a high-level shader language such as NVIDIA'S Cg ("C for graphics"). Cg uses a familiar C-like syntax and provides runtime libraries for integrating Cg code with programs written for OpenGL or DirectX. In addition to the OpenOL runtime library, Cg and OpenGL can be integrated by using Cg's compiler to translate Cg into assembly-language programs accessible through OpenGL extensions. In this article, I explain how to incorporate Cg into OpenGL programs using the runtime library and the relevant OpenGL extensions.