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

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

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

    QCoreApplication::setApplicationName("Qt QOpenGLWidget Example");
    QCoreApplication::setOrganizationName("QtProject");
    QCoreApplication::setApplicationVersion(QT_VERSION_STR);
    QCommandLineParser parser;
    parser.setApplicationDescription(QCoreApplication::applicationName());
    parser.addHelpOption();
    parser.addVersionOption();
    QCommandLineOption multipleSampleOption("multisample", "Multisampling");
    parser.addOption(multipleSampleOption);
    QCommandLineOption srgbOption("srgb", "Use sRGB Color Space");
    parser.addOption(srgbOption);
    parser.process(a);

    QSurfaceFormat format;
    format.setDepthBufferSize(24);
    format.setStencilBufferSize(8);
    if (parser.isSet(srgbOption))
        format.setColorSpace(QSurfaceFormat::sRGBColorSpace);
    if (parser.isSet(multipleSampleOption))
        format.setSamples(4);
    QSurfaceFormat::setDefaultFormat(format);

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