D23105: WIP: [platforms/x11] Cleanup GLX backend, revise compositing

ekurzinger added a comment.


  Regarding the fallback to the composite timer when using the proprietary NVIDIA driver, while it doesn't really support anything equivalent to GLX_INTEL_swap_event, there is https://www.khronos.org/registry/OpenGL/extensions/NV/GLX_NV_delay_before_swap.txt which has the similar goal of reduced input latency. See the extension description for details, but essentially it allows the application to block until a specified time before the next swap. I'm not sure if that's exactly fits what KWin needs here, but maybe worth considering?.
  
  Also, I'd be able to test this patch on a PRIME (hybrid graphics) system if nobody has done so yet. Given that there have been synchronization-related issues there before, it's probably worth checking.
  
  However, the patch doesn't seem to apply cleanly to HEAD any longer. Would you be able to post a rebased version?

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D23105

To: romangg, #kwin, fredrik
Cc: ekurzinger, alexde, nicolasfella, alexeymin, kwin, LeGast00n, The-Feren-OS-Dev, sbergeron, jraleigh, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, Pitel, iodelay, crozbo, bwowk, ZrenBot, ngraham, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, mart