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# main.cpp Example File

declarative/shadereffects/main.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
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     ** Alternatively, this file may be used under the terms of the GNU Lesser
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     ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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     ** GNU General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU
     ** General Public License version 3.0 as published by the Free Software
     ** Foundation and appearing in the file LICENSE.GPL included in the
     ** packaging of this file.  Please review the following information to
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     #include "qmlapplicationviewer.h"
     #include <QtGui/QApplication>
     #include <QtOpenGL>
     #include <QDeclarativeView>
     #include <QDeclarativeEngine>

     int main(int argc, char *argv[])
     {
     // Depending on which is the recommended way for the platform, either use
     // opengl graphics system or paint into QGLWidget.
     #ifdef SHADEREFFECTS_USE_OPENGL_GRAPHICSSYSTEM
         QApplication::setGraphicsSystem("opengl");
     #endif

         QApplication app(argc, argv);
         QmlApplicationViewer viewer;

     #ifndef SHADEREFFECTS_USE_OPENGL_GRAPHICSSYSTEM
         QGLFormat format = QGLFormat::defaultFormat();
         format.setSampleBuffers(false);
         format.setSwapInterval(1);
         QGLWidget* glWidget = new QGLWidget(format);
         glWidget->setAutoFillBackground(false);
         viewer.setViewport(glWidget);
     #endif

         viewer.setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
         viewer.setAttribute(Qt::WA_OpaquePaintEvent);
         viewer.setAttribute(Qt::WA_NoSystemBackground);
         viewer.setOrientation(QmlApplicationViewer::ScreenOrientationAuto);
         viewer.setMainQmlFile(QLatin1String("qml/shadereffects/main.qml"));
         QObject::connect(viewer.engine(), SIGNAL(quit()), &viewer, SLOT(close()));
         viewer.showExpanded();

         return app.exec();
     }