shader变体
unity shader 变种(多重编译 multi_compile)
https://www.jianshu.com/p/f34d896dde5d
Unity Shader - Making multiple shader program variants 制作shader程序多变体
https://blog.csdn.net/linjf520/article/details/93375272
Shader变体使用策略
https://www.jianshu.com/p/12cc73dc7413
unity-shader-ShaderVariant变体及宏及材质编辑器扩展
https://blog.csdn.net/yangxuan0261/article/details/88692236