Show/hide of window containing QGLWidget fails on remote X server

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Show/hide of window containing QGLW...

February 7, 2011

Jakob Schou

Lab Rat
25 posts

I have a window (QMainWindow or QDialog) with a QGLWidget. If I call hide() and then show() on the window I will get the following error when running in an X windows system (remote: linux server, mac client):

X Error: GLXBadContext 147 Extension: 146 (Uknown extension) Minor opcode: 5 (Unknown request) Resource id: 0xa0001c

(and nothing is rendered)

Any ideas what could cause this behavior?

1 reply

March 15, 2012

artem.marche..

Lab Rat
61 posts

I’ve got same problem in the same environment (local Mac, remote – Linux box).

What I do is I am creating a QDeclarativeView (actually QApplicationViewer that QtCreator’s wizard constructs) and use QGLWidget as a viewport in the following manner:

QmlApplicationViewer viewer;
...
viewer.setViewport(new QGLWidget);
...
viewer.setResizeMode(QDeclarativeView::SizeRootObjectToView);
...
viewer.setFrameStyle(0);
viewer.setAttribute(Qt::WA_OpaquePaintEvent);
viewer.setAttribute(Qt::WA_NoSystemBackground);
viewer.setAttribute(Qt::WA_DeleteOnClose);
viewer.setStyleSheet("background: transparent; border: none");
viewer.setWindowFlags(Qt::FramelessWindowHint);
viewer.setMainQmlFile(QLatin1String("qml/twclientqml/TwClient.qml"));
viewer.showFullScreen();

What could this message actually mean? OpenGL initialization failed and system falls back to raster?

‹‹ looking for nice tutorials for 3D graphics wrt shader development, portability between openGL w/ openGL ES code QObject ››

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February 7, 2011

Show/hide of window containing QGLWidget fails on remote X server

March 15, 2012

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