+ QCoreApplication::setAttribute(Qt::AA_ShareOpenGLContexts, true);
+
+ QSurfaceFormat fmt;
+ fmt.setDepthBufferSize(0);
+ fmt.setStencilBufferSize(0);
+ fmt.setProfile(QSurfaceFormat::CoreProfile);
+ fmt.setMajorVersion(3);
+ fmt.setMinorVersion(1);
+
+ // Turn off vsync, since Qt generally gives us at most frame rate
+ // (display frequency) / (number of QGLWidgets active).
+ fmt.setSwapInterval(0);
+
+ QSurfaceFormat::setDefaultFormat(fmt);
+
+ QGLFormat::setDefaultFormat(QGLFormat::fromSurfaceFormat(fmt));
+