http://bugs.winehq.org/show_bug.cgi?id=14767
--- Comment #7 from Roderick Colenbrander thunderbird2k@gmx.net 2009-01-01 05:22:52 --- This feature isn't very important and isn't exposed by most Linux drivers. Basically it defines how the backbuffer is copied to the front e.g. by performing a memcpy or performing a buffer swap. So you could say that this would remove another FIXME. I'll take a look at it some time as using some new GLX extensions we might be able to offer it properly.