| src | 要从中读取数据的资源。 |
| size | 要从 ComputeBuffer 中检索的数据的大小（以字节为单位）。 |
| offset | ComputeBuffer 中的偏移量（以字节为单位）。 |
| mipIndex | 要获取的 Mipmap 的索引。 |
| dstFormat | 数据的目标 TextureFormat。如果该格式不同于 GPU 中存储的格式，则系统会自动执行转换。 |
| x | 要获取的纹理数据的起始 X 坐标（以像素为单位）。 |
| width | 要获取的纹理数据的宽度（以像素为单位）。 |
| y | 要获取的纹理数据的起始 Y 坐标（以像素为单位）。 |
| height | 要获取的纹理数据的高度（以像素为单位）。 |
| z | 正在获取的 Texture3D 的起始 Z 坐标（以像素为单位）。正在获取的 TextureCube、Texture2DArray 和 TextureCubeArray 的起始层索引。 |
| depth | 正在获取的 Texture3D 的深度（以像素为单位）。TextureCube、TextureArray 和 TextureCubeArray 的层数。 |
| callback | 完成请求后调用的可选委托 System.Action。完成请求作为参数传递给 System.Action。 |
AsyncGPUReadbackRequest 可用于访问数据并检查数据是否可用的 AsyncGPUReadbackRequest。
触发从 GPU 资源中异步获取数据的请求。
如果由于将某些无效参数传递给此方法而发生错误，则返回带有错误的请求。如果返回了带有错误的请求，则对该请求调用 AsyncGPUReadbackRequest.hasError 将返回 true。
对于纹理数据，将根据源纹理的尺寸检查范围。如果图形 QualitySettings 设置得足够低而足以触发生成缩小尺寸的纹理，则必须请求缩小的尺寸。使用 QualitySettings.masterTextureLimit 通过向右移位的方式调整宽度和高度（以及 x、y，如果需要的话）。
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