Ross: Yes you don't use lockbuffer. But the hardware will do it to download the backbuffer content from VRAM to System RAM automatically.
thats why you dont gain / lose anything if you do it as well, its done anyway
but it puzzles me that it should be the same speed and checking the sources the reason was obvious: its a broken benchmark. the r2t has the setbuffer within the loops they must be outside for fair comparision. (resultet in a performance gain of 8%)
For me its hard to test as the visual output is not the same on my 8800GTS with 168.29 drivers.
The render to textures shows the spinning cube.
The copy rect only the backdrop
thats why you dont gain / lose anything if you do it as well, its done anyway
but it puzzles me that it should be the same speed and checking the sources the reason was obvious: its a broken benchmark. the r2t has the setbuffer within the loops they must be outside for fair comparision. (resultet in a performance gain of 8%)
For me its hard to test as the visual output is not the same on my 8800GTS with 168.29 drivers.
The render to textures shows the spinning cube.
The copy rect only the backdrop