wined3d smarter chache for the backbuffer

[Oliver Stieber]

This patch tracks clearing and writing to the back buffer so that when it is
locked we can use cache (or memset) to take the place of glReadPixels giving
at least 10 times the performance for movies and other tasks that write to the
backbuffer.


A good test to see the performance improvement is the dx9_2d_demo_game from
http://www.codesampler.com/dx9src.htm

TODO: Ideally clearBuffer and bufferValid should be encapsulated in IWineD3DSurface. (I'll send a
patch for that through soon)




		
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