public static ulong UpdateSubresources(
ID3D12GraphicsCommandList pCmdList,
ID3D12Resource pDestinationResource,
ID3D12Resource pIntermediate,
ulong IntermediateOffset,
int FirstSubresource,
int NumSubresources,
Span <SubresourceData> pSrcData)
{
Span <PlacedSubresourceFootPrint> pLayouts = stackalloc PlacedSubresourceFootPrint[NumSubresources];
Span <ulong> pRowSizesInBytes = stackalloc ulong[NumSubresources];
Span <int> pNumRows = stackalloc int[NumSubresources];
var Desc = pDestinationResource.Description;
ID3D12Device pDevice = null;
pDestinationResource.GetDevice(out pDevice);
pDevice.GetCopyableFootprints(Desc, (int)FirstSubresource, (int)NumSubresources, IntermediateOffset, pLayouts, pNumRows, pRowSizesInBytes, out ulong RequiredSize);
pDevice.Release();
ulong Result = UpdateSubresources(pCmdList, pDestinationResource, pIntermediate, FirstSubresource, NumSubresources, RequiredSize, pLayouts, pNumRows, pRowSizesInBytes, pSrcData);
return(Result);
}