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

     /****************************************************************************
     **
     ** Copyright (C) 2005-2007 Trolltech ASA. All rights reserved.
     **
     ** This file is part of the example classes of the Qt Toolkit.
     **
     ** This file may be used under the terms of the GNU General Public
     ** License version 2.0 as published by the Free Software Foundation
     ** and appearing in the file LICENSE.GPL included in the packaging of
     ** this file.  Please review the following information to ensure GNU
     ** General Public Licensing requirements will be met:
     ** http://www.trolltech.com/products/qt/opensource.html
     **
     ** If you are unsure which license is appropriate for your use, please
     ** review the following information:
     ** http://www.trolltech.com/products/qt/licensing.html or contact the
     ** sales department at sales@trolltech.com.
     **
     ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
     ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
     **
     ****************************************************************************/

     #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();
     }