[Differential] [Request, 24 lines] D2955: Fix scissoring of VBO rendering in multi-screen setup on Wayland

[graesslin (Martin Gräßlin)]

graesslin created this revision.
graesslin added reviewers: KWin, Plasma on Wayland.
Restricted Application added subscribers: kwin, plasma-devel.
Restricted Application added projects: Plasma on Wayland, KWin.

REVISION SUMMARY
  On Wayland in multi-screen a "window" is used to render to per screen.
  In OpenGL every "window" is at 0/0 and scissoring is in respect to the
  window geometry. The rendering geometry passed to VBO rendering, which
  performs the scissoring, is in virtual combined screen geometry space.
  Thus the scissoring always removes any rendering on the second screen.
  This results in e.g. wobbly windows not working on any additional screen
  on Wayland.
  
  This change makes the VBO rendering multi-screen aware by passing the
  current virtual window geometry in each rendering pass. That replaces
  the so far used virtual screen size. For single screen rendering or
  multi-screen rendering on X11 this doesn't change anything as there is
  always only one OpenGL window and the screen geoemetry starts at 0/0.
  Thus the subtracting of x/y geometry do not affect the scissoring at
  all.

REPOSITORY
  rKWIN KWin

BRANCH
  vertex-buffer-scissoring-multi-screen

REVISION DETAIL
  https://phabricator.kde.org/D2955

AFFECTED FILES
  libkwineffects/kwinglutils.cpp
  libkwineffects/kwinglutils.h
  scene_opengl.cpp

EMAIL PREFERENCES
  https://phabricator.kde.org/settings/panel/emailpreferences/

To: graesslin, #kwin, #plasma_on_wayland
Cc: plasma-devel, kwin, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas
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