D25298: Add hasSwapEvent getter

[Roman Gilg]

romangg created this revision.
romangg added a reviewer: KWin.
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REVISION SUMMARY
  Add a small getter to query information internally if the backend supports
  swap events. Defaults to true as it is the default in the GBM Wayland backend.

TEST PLAN
  i915

REPOSITORY
  R108 KWin

BRANCH
  swap-event-getter

REVISION DETAIL
  https://phabricator.kde.org/D25298

AFFECTED FILES
  platformsupport/scenes/opengl/backend.h
  plugins/platforms/x11/standalone/glxbackend.cpp
  plugins/platforms/x11/standalone/glxbackend.h
  plugins/scenes/opengl/scene_opengl.cpp
  plugins/scenes/opengl/scene_opengl.h
  scene.cpp
  scene.h

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