允许异步读取 GPU 资源。
此类用于将资源数据从 GPU 复制到 CPU，而不会产生任何停顿（GPU 或 CPU），但会增加几帧延迟。其他资源：AsyncGPUReadbackRequest。
其他资源：SystemInfo.supportsAsyncGPUReadback，SystemInfo.supportsAsyncGPUReadback。
| Request | 异步从 GPU 资源检索数据。 |
| RequestAsync | 异步从 GPU 资源检索数据。 |
| RequestIntoNativeArray | 异步从 GPU 纹理资源检索数据。 |
| RequestIntoNativeArrayAsync | 异步从 GPU 纹理资源检索数据。 |
| RequestIntoNativeSlice | 异步从 GPU 纹理资源检索数据。 |
| RequestIntoNativeSliceAsync | 异步从 GPU 纹理资源检索数据。 |
| WaitAllRequests | 等待所有请求完成。 |
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