qt5base-lts/tests/manual/qopenglwidget/openglwidget/main.cpp

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#include "openglwidget.h"
#include <QApplication>
#include <QPushButton>
#include <QMdiArea>
#include <QLCDNumber>
#include <QTimer>
#include <QSurfaceFormat>
#include <QDebug>

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

    QSurfaceFormat format;
    if (QCoreApplication::arguments().contains(QLatin1String("--multisample")))
        format.setSamples(4);
    if (QCoreApplication::arguments().contains(QLatin1String("--coreprofile"))) {
        format.setVersion(3, 2);
        format.setProfile(QSurfaceFormat::CoreProfile);
    }
    qDebug() << "Requesting" << format;

    QMdiArea w;
    w.resize(400,400);

    OpenGLWidget *glw = new OpenGLWidget;
    glw->setFormat(format);
    w.addSubWindow(glw);
    glw->setMinimumSize(100,100);

    OpenGLWidget *glw2 = new OpenGLWidget;
    glw2->setFormat(format);
    glw2->setMinimumSize(100,100);
    w.addSubWindow(glw2);

    QLCDNumber *lcd = new QLCDNumber;
    lcd->display(1337);
    lcd->setMinimumSize(300,100);
    w.addSubWindow(lcd);

    w.show();

    if (glw->isValid())
        qDebug() << "Got" << glw->format();

    return a.exec();
}