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main.cpp Example File
opengl/samplebuffers/main.cpp

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 #include <QtGui/QApplication>
 #include <QtGui/QMessageBox>
 #include "glwidget.h"

 int main(int argc, char **argv)
 {
     QApplication a(argc, argv);

     QGLFormat f = QGLFormat::defaultFormat();
     f.setSampleBuffers(true);
     QGLFormat::setDefaultFormat(f);
     if (!QGLFormat::hasOpenGL()) {
         QMessageBox::information(0, "OpenGL samplebuffers",
                                  "This system does not support OpenGL.");
         return 0;
     }

     GLWidget widget(0);

     if (!widget.format().sampleBuffers()) {
         QMessageBox::information(0, "OpenGL samplebuffers",
                                  "This system does not have sample buffer support.");
         return 0;
     }

     widget.resize(640, 480);
     widget.show();

     return a.exec();
 }


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Qt 4.3.5