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

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

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

    QSurfaceFormat format;
    format.setDepthBufferSize(24);
    format.setStencilBufferSize(8);
    if (QCoreApplication::arguments().contains(QStringLiteral("--multisample")))
        format.setSamples(4);
    QSurfaceFormat::setDefaultFormat(format);

    MainWindow mw;
    mw.showMaximized();
    return a.exec();
}