| output | Reference to a NativeArray to write the data into. | 
| src | The resource to read the data from. | 
| size | The size in bytes of the data to be retrieved from the ComputeBuffer or GraphicsBuffer. | 
| offset | The offset in bytes in the ComputeBuffer or GraphicsBuffer. | 
| mipIndex | The index of the mipmap to be retrieved. | 
| dstFormat | The target TextureFormat of the data. If the target format is different from the format stored on the GPU, the conversion is automatic. | 
| x | The starting X coordinate in pixels of the Texture data to be retrieved. | 
| y | The starting Y coordinate in pixels of the Texture data to be retrieved. | 
| z | The starting Z coordinate in pixels for the Texture3D being retrieved. Index of Start layer for TextureCube, Texture2DArray and TextureCubeArray being retrieved. | 
| depth | The depth in pixels for Texture3D being retrieved. Number of layers for TextureCube, TextureArray and TextureCubeArray. | 
| width | The width in pixels of the Texture data to be retrieved. | 
| height | The height in pixels of the Texture data to be retrieved. | 
| callback | A delegate System.Action called when the request is completed. The done request is passed as a parameter to the System.Action callback. | 
Adds an asynchonous GPU readback request command to the command buffer.
See Also: AsyncGPUReadback.RequestIntoNativeArray.