[krita] /: Merge branch 'alvin/T6696-opengl-angle'

[Alvin Wong]

Git commit 0b2344049c23c75809a4c55da667c18e2ed5c6a6 by Alvin Wong.
Committed on 10/09/2017 at 17:19.
Pushed by alvinwong into branch 'master'.

Merge branch 'alvin/T6696-opengl-angle'

This adds canvas rendering with Direct3D11 via ANGLE on Windows.

ANGLE is a library which translates OpenGL ES rendering functions to
other hardware rendering APIs, including Direct3D. It is supported by
the Windows build of Qt.

This aims to improve the compatibility of the OpenGL canvas with buggy
Windows Intel drivers by allowing the use of the Direct3D11 rendering
backend of ANGLE.

Krita can still be used with a Qt build without dynamic OpenGL support,
but it will only be able to use native desktop OpenGL. To enable ANGLE,
`ext_qt` will need to be rebuilt.

CCMAIL: kimageshop at kde.org
CCBUG: 360601
Maniphest Tasks: T5883, T6696, T6728


https://commits.kde.org/krita/0b2344049c23c75809a4c55da667c18e2ed5c6a6