On Monday 30 January 2012 02:15 PM,
dietrich.gos...@continental-corporation.com wrote:
Hi,
somehow the Hardware Accerlation with GLWidget doesn’t work.
I think I am missing something trivial.
thats how my code looks like:
1. int main(int argc, char *argv[])
2. {
3. _QApplication_
<http://developer.qt.nokia.com/doc/QApplication.html>a(argc, argv);
4. a.setGraphicsSystem("native");
5.
6. _QGraphicsScene_
<http://developer.qt.nokia.com/doc/QGraphicsScene.html>scene;
7. scene.setSceneRect(0.0, 0.0, 500.0, 500.0);
8.
9.
10. _QGraphicsView_
<http://developer.qt.nokia.com/doc/QGraphicsView.html>view(&scene);
11. view.setHorizontalScrollBarPolicy(_Qt_
<http://developer.qt.nokia.com/doc/Qt.html>::ScrollBarAlwaysOff);
12. view.setVerticalScrollBarPolicy(_Qt_
<http://developer.qt.nokia.com/doc/Qt.html>::ScrollBarAlwaysOff);
13.
14. _QGLFormat_ <http://developer.qt.nokia.com/doc/QGLFormat.html>fmt
= _QGLFormat_
<http://developer.qt.nokia.com/doc/QGLFormat.html>::defaultFormat();
15.
16. fmt.setDoubleBuffer(true);
17. fmt.setSwapInterval(1);
18.
19. _QGLWidget_ <http://developer.qt.nokia.com/doc/QGLWidget.html>*
glWidget = new _QGLWidget_
<http://developer.qt.nokia.com/doc/QGLWidget.html>(fmt);
20.
21. view.setGeometry(0, 0, 500, 500);
22. view.setViewport(glWidget);
23.
24. view.setViewportUpdateMode(
25. _QGraphicsView_
<http://developer.qt.nokia.com/doc/QGraphicsView.html>::FullViewportUpdate);
26.
27. view.viewport()->setAttribute(_Qt_
<http://developer.qt.nokia.com/doc/Qt.html>::WA_OpaquePaintEvent);
28. view.viewport()->setAttribute(_Qt_
<http://developer.qt.nokia.com/doc/Qt.html>::WA_NoSystemBackground);
29.
30.
31. MainWindow w(&scene);
32.
33. view.show();
34.
35. return a.exec();
36. }
The cpu load ist steally quite heavy (~90 %)
Does anyone has an idea why it’s not working?
I am using the same settings with a QML/C++ application and it works
fine .. with hardware accerlation.
Dietrich
I dont know why GLWidget is not working for you. I dont see anything
wrong there.
But "a.setGraphicsSystem("native"); " is not doing anything.
It should be called before application construction to have any effect .
--
Regards,
Pritam
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