Hi Thomas, The problem with glWaitVideoSync() is that it waits on the CPU, so any interval of time can happen between performing that wait and issuing the blit, which means tear-free presentation isn't guaranteed.
We briefly discussed this with Fredrik a few days ago, and contrary to what I said GLX_EXT_buffer_age isn't yet exposed on current 310 drivers (as you found out). However we should be rolling out a new release series shortly, which will include support for it. The intention behind the change you linked is good, but without the functionality provided by GLX_EXT_buffer_age you have no guarantees about how many buffers are in the flip queue of the driver; it's usually a trivial cycle between 2 or 3 buffers depending whether Triple Buffering is enabled, but other implementations might have their own specific flipping mechanism. Thanks, - Pierre-Loup -- You received this bug notification because you are a member of Kubuntu Bugs, which is subscribed to kde-workspace in Ubuntu. https://bugs.launchpad.net/bugs/1069498 Title: KWin shows tearing despite of VSync To manage notifications about this bug go to: https://bugs.launchpad.net/kdebase-workspace/+bug/1069498/+subscriptions -- kubuntu-bugs mailing list kubuntu-b...@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs
