| layer | 要检索的层的索引。 |
获取成功请求的数据。
如果在请求尚未完成或已被处理时调用此方法，则会抛出 InvalidOperationException。 如果请求仍处于待处理状态，则对此请求调用 AsyncGPUReadbackRequest.done 将返回 false。 如果请求未成功完成或者已被处理，则对此请求调用 AsyncGPUReadbackRequest.hasError 将返回 true。 您可通过索引层访问 Texture3D、TextureCube、Texture2DArray 和 TextureCubeArray 的不同请求切片。
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