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# main.cpp Example File
opengl/pbuffers2/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);
         if (!QGLFormat::hasOpenGL() || !QGLPixelBuffer::hasOpenGLPbuffers()) {
             QMessageBox::information(0, "OpenGL pbuffers 2",
                                      "This system does not support OpenGL/pbuffers.");
             return -1;
         }

         GLWidget widget(0);
         widget.resize(640, 480);
         widget.show();
         return a.exec();
     }