title: Copy backbuffer directly to video memory
body: <p>Is there a way to directly copy the backbuffer data into the video memory? I mean without using system memory. All the methods that I found so far (like <a href="https://stackoverflow.com/a/5143778/825318">this</a> or <a href="https://stackoverflow.com/a/6765878/825318">this</a>) copy the backbuffer content into system memory which takes significant amount of time.</p>
  
  <p>My task is to create a surface or a texture in the video memory and tell the graphics adapter to directly copy the backbuffer to there, without using the bus. Thanks</p>