中文文档，此文档讲解的内容主要为GPU渲染，语言为cg，是一种类似于hlsl的语言，对于想学习GPU渲染和可变渲染通道的筒子们有很大帮助。-Chinese document, the contents of this document to explain the main rendering for GPU language as cg, is language similar hlsl, who want to learn cheese have GPU rendering and vari