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

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#include <QApplication>
#include <QMainWindow>
#include <QSurfaceFormat>
#include "mainwindow.h"
#include "glwidget.h"

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

    QSurfaceFormat format;
    format.setDepthBufferSize(16);
    QSurfaceFormat::setDefaultFormat(format);

    // Two top-level windows with two QOpenGLWidget children in each.
    // The rendering for the four QOpenGLWidgets happens on four separate threads.
    MainWindow mw1;
    mw1.setMinimumSize(800, 400);
    mw1.show();

    QScopedPointer<MainWindow> mw2;
    if (!QApplication::arguments().contains(QStringLiteral("--single"))) {
        mw2.reset(new MainWindow);
        mw2->setMinimumSize(800, 400);
        mw2->show();

        // And a top-level.
        GLWidget *bonus = new GLWidget(0);
        bonus->resize(200, 200);
        bonus->show();
    }

    return a.exec();
}