ShaderLab 包括许多“固定函数样式”命令,用于在不使用任何 HLSL 代码的情况下编写着色器。
注意:以下命令是旧版才有的,文档中介绍它们只是为了向后兼容。如果 Shader 对象源文件包含 HLSL 代码,Unity 将完全忽略这些命令。如果着色器源文件不包含 HLSL 代码,Unity 会在导入时将这些命令编译为常规着色器程序。
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