Norman Vine wrote: > This used to be true but not with the current cards or on any NVIDIA > card with a current driver glCopyTexSubImage is FAST even without > using pbuffers
It's not all that fast. You still have to clear the back buffer and you still need to do the memory blit into the texture. It's not slow, and it makes fun techniques like impostering and dynamic cube map generation possible. But compared with "traditional" rendering it still costs significant fill rate. Remember that the "slow" thing your trying to fix is the fill rate penalty of rendering all the panel layers; the panel layers don't have significant geometry to speak of, they're slow because of all the texture reads. Fixing that problem with a fill-rate-intensive algorithm won't give you quite as much of a speed up as you think. Again, I'm not saying that it won't be faster. I'm saying that it might not be quite as fast as you imagine, and that it involves significant tradeoffs in panel fidelity that I'd be really hesitant to make on systems that are already getting slow frame rates. Andy -- Andrew J. Ross NextBus Information Systems Senior Software Engineer Emeryville, CA [EMAIL PROTECTED] http://www.nextbus.com "Men go crazy in conflagrations. They only get better one by one." - Sting (misquoted) _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
