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

fredrik added a comment.


  NVIDIA doesn't support the OML extensions. They can't be implemented efficiently on their hardware IIRC.
  
  NVIDIA supports:
  
  - GLX_EXT_swap_control
  - GLX_EXT_swap_control_tear
  - GLX_SGI_swap_control
  - GLX_SGI_video_sync
  - GLX_NV_delay_before_swap
  - GLX_NV_swap_group
  
  Catalyst supports:
  
  - GLX_EXT_swap_control
  - GLX_SGI_swap_control
  - GLX_SGI_video_sync
  - GLX_NV_swap_group
  - GLX_MESA_swap_control
  - GLX_OML_swap_method
  
  Mesa supports:
  
  - GLX_SGI_swap_control
  - GLX_SGI_video_sync
  - GLX_MESA_swap_control
  - GLX_OML_swap_method
  - GLX_OML_sync_control
  - GLX_INTEL_swap_event

INLINE COMMENTS

> glxbackend.cpp:718
> +        // Swap is possible because of full repaint or buffer age support.
> +        // TODO: Why is buffer age so important for that? We can also swap without it.
> +        swap();

Because the contents of the backbuffer are undefined after a buffer swap without GLX_EXT_buffer_age.

REPOSITORY
  R108 KWin

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

To: romangg, #kwin, fredrik
Cc: 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