Hi,
Because it tears down and then reinitializes graphics resources when changing the associated top-level window. This does not explain the flicker, though. As a workaround try doing QCoreApplication::setAttribute(Qt:AA_ShareOpenGLContexts) before constructing the QApplication. See the sections starting with "Note: For widgets that change their associated top-level window ..." in http://doc.qt.io/qt-5/qopenglwidget.html#resource-initialization-and-cleanup <http://doc.qt.io/qt-5/qopenglwidget.html#resource-initialization-and-cleanup>Best regards, Laszlo ________________________________ From: Interest <interest-bounces+laszlo.agocs=qt...@qt-project.org> on behalf of Alexandre Ribeiro <alexandregomesribe...@gmail.com> Sent: Monday, March 27, 2017 11:58:55 PM To: interest@qt-project.org Subject: [Interest] QOpenGLWidget inside QDockWidget Hi, I've placed a QOpenGLWidget inside a QDockWidget and everything works as expected. However when I drag the dockwidget from the main window there's a blue flicker in the QOpenGLWidget. This blue flicker has nothing to do with my OpenGL code (right now it's merely clearing the background with red). Any idea on what might be happening? Best regards, Alex
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