qt5base-lts/examples/opengl/pbuffers2/main.cpp

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

int main(int argc, char **argv)
{
    Q_INIT_RESOURCE(pbuffers2);

    QApplication a(argc, argv);
    GLWidget widget(0);
    widget.resize(640, 480);
    widget.makeCurrent();
    if (!QGLFormat::hasOpenGL() || !QGLPixelBuffer::hasOpenGLPbuffers()) {
	QMessageBox::information(0, "OpenGL pbuffers 2",
				 "This system does not support OpenGL/pbuffers.");
        return -1;
    }
    widget.show();
    return a.exec();
}