windows: Introduce a built-in GPU blacklist

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>

1 files changed, 18 insertions, 0 deletions

diff --git a/src/gui/opengl/qopengl_p.h b/src/gui/opengl/qopengl_p.h
index 377440455a..e04ae05120 100644
--- a/src/gui/opengl/qopengl_p.h
+++ b/src/gui/opengl/qopengl_p.h
@@ -77,6 +77,9 @@ public:
     struct Gpu {
         Gpu() : vendorId(0), deviceId(0) {}
         bool isValid() const { return deviceId; }
+        bool equals(const Gpu &other) const {
+            return vendorId == other.vendorId && deviceId == other.deviceId && driverVersion == other.driverVersion;
+        }
 
         uint vendorId;
         uint deviceId;
@@ -93,6 +96,21 @@ public:
     static QSet<QString> gpuFeatures(const Gpu &gpu, const QString &fileName);
 };
 
+inline bool operator==(const QOpenGLConfig::Gpu &a, const QOpenGLConfig::Gpu &b)
+{
+    return a.equals(b);
+}
+
+inline bool operator!=(const QOpenGLConfig::Gpu &a, const QOpenGLConfig::Gpu &b)
+{
+    return !a.equals(b);
+}
+
+inline uint qHash(const QOpenGLConfig::Gpu &gpu)
+{
+    return qHash(gpu.vendorId) + qHash(gpu.deviceId) + qHash(gpu.driverVersion);
+}
+
 QT_END_NAMESPACE
 
 #endif // QOPENGL_H