public static long UpdateSubResources(GraphicsCommandList cmdList, Resource destResource, Resource intermediateResource, int firstSubresource, int numSubresource, long requiredSize, PlacedSubResourceFootprint[] layouts, long[] rowSizesInBytes, SubResourceInformation[] datas) { var intermediateDesc = intermediateResource.Description; var destDesc = destResource.Description; var dataPtr = Marshal.UnsafeAddrOfPinnedArrayElement(datas, 0); if (intermediateDesc.Dimension != ResourceDimension.Buffer || intermediateDesc.Width < requiredSize + layouts[0].Offset || requiredSize == 0 || (destDesc.Dimension == ResourceDimension.Buffer && (firstSubresource != 0) || numSubresource != 1)) { return(0); } var ptr = intermediateResource.Map(0, null); if (ptr == IntPtr.Zero) { return(0); } for (int idx = 0; idx < numSubresource; idx++) { if (rowSizesInBytes[idx] == 0) { return(0); } intermediateResource.WriteToSubresource(idx, null, new IntPtr(datas[idx].Offset), datas[idx].RowPitch, datas[idx].DepthPitch); } if (destDesc.Dimension == ResourceDimension.Buffer) { cmdList.CopyBufferRegion(destResource, 0, intermediateResource, layouts[0].Offset, layouts[0].Footprint.Width); } else { for (int idx = 0; idx < numSubresource; idx++) { var dest = new TextureCopyLocation(destResource, idx + firstSubresource); var src = new TextureCopyLocation(intermediateResource, layouts[idx]); cmdList.CopyTextureRegion(dest, 0, 0, 0, src, null); } } return(requiredSize); }