Onsdag 21 mars 2007 20:32, skrev du : > Am Mittwoch 21 März 2007 20:01 schrieb Alexander Nicolaysen Sørnes: > > Greetings, > > > > i am thinking about participating in the Summer of Code, and thought it > > would be interesting to improve DirectDraw such that Command & Conquer > > Tiberian Sun & Red Alert 2 run faster. Currently, they crash once the > > mouse is moved in-game when OpenGL rendering is enabled. Thus the > > project would involve fixing that bug, and then other performance > > issues/crashes that occur. However, I don't really have much experience > > with C and Wine. The closest I have gotten is some patches for Wine's > > WordPad > > implementation. Would it be feasible to acquire the necessary knowledge > > and fix the bugs before the end of summer? > > I think learning those things over the summer is feasable. There is not > much OpenGL knowledge required, it is mostly about drawing textured quads. > > Unfortunately other issues are major: > The crash when moving the mouse is because those games draw the mouse from > a different thread. My multithreaded opengl patches may fix that. But for > real thread safety we have to implement locking of private data. For one > part this needs a lot of patience because those patches are tricky to > review for Alexandre, and it needs knowledge about thread synchronisation. > Overall it is a very tricky task. > > The other issue is render target locking. This is essentially something > that is not well supported by OpenGL. There are 2 extensions which can help > to improve that, one is the pixel buffer objects extension, the other one > is a nvidia only extension which does exactly the same as > IDirectDrawSurface7::Lock. If neither of those extensions is available, or > if pbos turn out to be slow too, we can only play tricks like watching the > application's behavior and predict the area it will modify. I have started > toying with that, the most important fragment is this: > http://stud4.tuwien.ac.at/~e0526822/optimizer.junk
A pity. What about fixing Bug #2666, about how the menu text colour is 'lost' in Age of Empires I & II. I know these games are not really playable without a DIB engine, but they won't be properly playable either without the campaign texts etc. I apologize if I seem a bit hasty, but the deadline is fast approaching . . . :) Alexander N. Sørnes
