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Use a built-in JSON file in case the QT_OPENGL_BUGLIST environment
variable is not set. When QT_OPENGL_BUGLIST is set, the built-in list
is ignored.
To make the implementation simpler and more readable, some of the code
in QWindowsOpenGLTester is reshuffled a bit. It also caches the results
now, so it is safe and fast to call supportedRenderers() and friends
multiple times.
The blacklist currently contains the Intel card from QTBUG-43263 (Intel
GMA / HD3000 ?) and may also apply to QTBUG-42240.
[ChangeLog][QtGui] Qt now contains a built-in GPU driver blacklist for
Windows that disables the usage of desktop OpenGL with some older cards
that are known to be unstable with opengl32.dll.
Task-number: QTBUG-42240
Task-number: QTBUG-43263
Change-Id: I1ecd65b51fca77925317d52048e7ab01d9b8797c
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>
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