[Differential] [Request, 35 lines] D3502: Provide scale offset to WindowVertex calculation

[davidedmundson (David Edmundson)]

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

REVISION SUMMARY
  WindowVertex contains the x position and also the relative texture x position
  
  Our textures are scaled bigger than kwin's resolution, so this makes sure we set the right
  texture position.
  
  Otherwise our final array ends up using 0 to 0.5 of the texture, not 0 to 1.

TEST PLAN
  Opened some 2x windows, on a 1x output.
  It looked how it should do, instead of it being double the size and cropped
  
  Tested some things that use quads, like wobbly windows

REPOSITORY
  rKWIN KWin

REVISION DETAIL
  https://phabricator.kde.org/D3502

AFFECTED FILES
  libkwineffects/kwineffects.h
  scene.cpp
  scene.h

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

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