https://learn.microsoft.com/en-us/windows/win32/api/d3d11/nf-d3d11-id3d11devicecontext-updatesubresource
ID3D11DeviceContext::UpdateSubresource (d3d11.h) - Win32 apps | Microsoft Learn
The CPU copies data from memory to a subresource created in non-mappable memory. (ID3D11DeviceContext.UpdateSubresource)
happsmicrosoftlearn