D26371: For squashing into D25907

davidedmundson created this revision.
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REVISION SUMMARY
  Ported to MapTexture shader, result was the same as the previous code
  but should be supported better across more hardware.

TEST PLAN
  Had some slight issues with the rotation, but everything appeared the same
  as when I applied the patchset with the custom shader.

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D26371

AFFECTED FILES
  plugins/platforms/drm/egl_gbm_backend.cpp
  plugins/platforms/drm/egl_gbm_backend.h

To: davidedmundson, #kwin
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