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diff --git a/examples/opengl/threadedqopenglwidget/glwidget.h b/examples/opengl/threadedqopenglwidget/glwidget.h
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+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
+**     of its contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef GLWIDGET_H
+#define GLWIDGET_H
+
+#include <QOpenGLWidget>
+#include <QOpenGLFunctions>
+#include <QOpenGLShaderProgram>
+#include <QVector3D>
+#include <QMatrix4x4>
+#include <QThread>
+#include <QMutex>
+#include <QWaitCondition>
+#include <QElapsedTimer>
+
+class GLWidget;
+
+class Renderer : public QObject, protected QOpenGLFunctions
+{
+    Q_OBJECT
+
+public:
+    Renderer(GLWidget *w);
+    void lockRenderer() { m_renderMutex.lock(); }
+    void unlockRenderer() { m_renderMutex.unlock(); }
+    QMutex *grabMutex() { return &m_grabMutex; }
+    QWaitCondition *grabCond() { return &m_grabCond; }
+    void prepareExit() { m_exiting = true; m_grabCond.wakeAll(); }
+
+signals:
+    void contextWanted();
+
+public slots:
+    void render();
+
+private:
+    void paintQtLogo();
+    void createGeometry();
+    void quad(qreal x1, qreal y1, qreal x2, qreal y2, qreal x3, qreal y3, qreal x4, qreal y4);
+    void extrude(qreal x1, qreal y1, qreal x2, qreal y2);
+
+    bool m_inited;
+    qreal m_fAngle;
+    qreal m_fScale;
+    QVector<QVector3D> vertices;
+    QVector<QVector3D> normals;
+    QOpenGLShaderProgram program;
+    int vertexAttr;
+    int normalAttr;
+    int matrixUniform;
+    GLWidget *m_glwidget;
+    QMutex m_renderMutex;
+    QElapsedTimer m_elapsed;
+    QMutex m_grabMutex;
+    QWaitCondition m_grabCond;
+    bool m_exiting;
+};
+
+class GLWidget : public QOpenGLWidget
+{
+    Q_OBJECT
+public:
+    GLWidget(QWidget *parent);
+    ~GLWidget();
+
+protected:
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE { }
+
+signals:
+    void renderRequested();
+
+public slots:
+    void grabContext();
+
+private slots:
+    void onAboutToCompose();
+    void onFrameSwapped();
+    void onAboutToResize();
+    void onResized();
+
+private:
+    QThread *m_thread;
+    Renderer *m_renderer;
+};
+
+#endif