D7734: Add virtual method to Scene to get the EGL/GLX extensions

[Martin Flöser]

graesslin created this revision.
Restricted Application added a project: KWin.
Restricted Application added subscribers: kwin, plasma-devel.

REVISION SUMMARY
  We had a few places (e.g. DebugConsole, Platform) where the Scene was
  cased into a SceneOpenGL to access the backend and get the extensions.
  
  This change simplifies that by adding a virtual method to Scene directly
  which is implemented in SceneOpenGL and returns the backend's
  extensions.
  
  Thus the casts to SceneOpenGL are no longer required.

TEST PLAN
  Opened debug console to verify extensions are listed,
  triggered Outline to verify the sharing QPA context gets created.

REPOSITORY
  R108 KWin

BRANCH
  scene-opengl-platform-interface-extensions

REVISION DETAIL
  https://phabricator.kde.org/D7734

AFFECTED FILES
  debug_console.cpp
  platform.cpp
  scene.cpp
  scene.h
  scene_opengl.cpp
  scene_opengl.h

To: graesslin, #kwin, #plasma
Cc: plasma-devel, kwin, bwowk, ZrenBot, progwolff, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart
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