Qt 5.11 | Qt OpenGL | Hello GL2 Example | main.cpp Example File

Qt 5.11.3 Reference Documentation

# main.cpp Example File

hellogl2/main.cpp

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      #include <QApplication>
      #include <QDesktopWidget>
      #include <QSurfaceFormat>
      #include <QCommandLineParser>
      #include <QCommandLineOption>

      #include "glwidget.h"
      #include "mainwindow.h"

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

          QCoreApplication::setApplicationName("Qt Hello GL 2 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 coreProfileOption("coreprofile", "Use core profile");
          parser.addOption(coreProfileOption);
          QCommandLineOption transparentOption("transparent", "Transparent window");
          parser.addOption(transparentOption);

          parser.process(app);

          QSurfaceFormat fmt;
          fmt.setDepthBufferSize(24);
          if (parser.isSet(multipleSampleOption))
              fmt.setSamples(4);
          if (parser.isSet(coreProfileOption)) {
              fmt.setVersion(3, 2);
              fmt.setProfile(QSurfaceFormat::CoreProfile);
          }
          QSurfaceFormat::setDefaultFormat(fmt);

          MainWindow mainWindow;

          GLWidget::setTransparent(parser.isSet(transparentOption));
          if (GLWidget::isTransparent()) {
              mainWindow.setAttribute(Qt::WA_TranslucentBackground);
              mainWindow.setAttribute(Qt::WA_NoSystemBackground, false);
          }
          mainWindow.resize(mainWindow.sizeHint());
          int desktopArea = QApplication::desktop()->width() *
                           QApplication::desktop()->height();
          int widgetArea = mainWindow.width() * mainWindow.height();
          if (((float)widgetArea / (float)desktopArea) < 0.75f)
              mainWindow.show();
          else
              mainWindow.showMaximized();
          return app.exec();
      }