| cmd | 目标命令缓冲区。 |
| allow | 是否允许异步着色器编译。 |
在 CommandBuffer 中添加着色器编译模式命令。
编辑器按需编译着色器变体，第一次渲染需要特定的着色器变体。默认情况下，异步着色器编译仅对来自游戏视图或场景视图的请求启用。有了此方法，你可以向 CommandBuffer 中添加命令以控制在缓冲区执行期间的着色器编译。这使你可以在渲染的特定部分禁令和启用异步编译，同时适用于游戏视图、场景视图和其他视图，例如自定义工具。要还原先前的编译模式，请参阅 RestoreAsyncCompilation。
其他资源：RestoreAsyncCompilation、allowAsyncCompilation、anythingCompiling、IsPassCompiled、CompilePass。
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