   Copying a surface to a texture fast.
  Hi there.Is it possible to dump the backbuffer/render target to a texture quickly?I need the texture in order run post process shaders on it but I'm writing a plugin for another engine so I *cannot* change the render target beforehand.Therefore I need to grab what has already been rendered every frame as quickly as possible.it seems that LoadSurfacetoSurface is far too slow for this.Any suggestions?EDIT: I should also note that I dont actually want to *DO* anything to this texture except draw it back to the screen.I dunno if that makes a difference re:system memory vs video memory or something.[Edited by - Calin Leafshade on August 8, 2010 2:49:28 AM]