makeCurrentOpenGlContext 1860 modules/highgui/src/window_QT.cpp void CvWindow::makeCurrentOpenGlContext() makeCurrentOpenGlContext 2445 modules/highgui/src/window_QT.cpp void DefaultViewPort::makeCurrentOpenGlContext() makeCurrentOpenGlContext 3138 modules/highgui/src/window_QT.cpp void OpenGlViewPort::makeCurrentOpenGlContext()