在所有子着色器的后面可定义 Fallback。基本上就是说,“如果没有任何子着色器能够在此硬件上运行,则尝试使用另一个着色器中的子着色器”。
Fallback "name"
回退到具有给定_名称 (name)_ 的着色器,或者…
Fallback Off
显式说明即使没有子着色器可以在此硬件上运行,也不会进行回退并且不会显示警告。
Fallback 语句的效果等同于插入其他着色器中的所有子着色器。
Shader "example" {
// 此处为属性和子着色器...
Fallback "otherexample"
}
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