// 主要CG代码逻辑，SubShader只负责组装这些逻辑
#ifndef ClipSpaceClipping_INCLUDE  
#define ClipSpaceClipping_INCLUDE 

#define COMPUTECLIPPOSITION(o, vertex) o.clipPos = vertex.xy / vertex.w;

#define CHECKCLIPPING(i) i.clipPos.x < _ClipArea.x || i.clipPos.x > _ClipArea.z || i.clipPos.y < _ClipArea.y || i.clipPos.y > _ClipArea.w
#endif