On Tue, Feb 22, 2011 at 1:56 AM, Thomas Hellstrom <tho...@shipmail.org> wrote: > Hi, Chia-I, > > Looking at the EGL DRM implementation of swapbuffers, it looks like we're > sort of ad-hoc attaching the backbuffer as a new scanout surface, using > drmModeSetCrtc. > > I don't think this works very well on all hardware. In particular, I think > drmModeSetCrtc may return before the swap actually takes place, which will > cause rendering to the old front buffer while it is still displaying. > > Could you fill me in why the pageflip ioctl isn't used here, and a surface > copy in situations where the pageflip ioctl can't be used? IIRC, the > pageflip ioctl is required to block rendering to the old frontbuffer until > the new frontbuffer is flipped in. Yes, pageflip should be used when available. I did not use it simply because it was not available on my machine when the code was written, and I haven't had the motivation to revisit the code yet..
> Thanks, > Thomas > > > > > -- o...@lunarg.com _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
