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diff --git a/examples/opengl/contextinfo/renderwindow.h b/examples/opengl/contextinfo/renderwindow.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 RENDERWINDOW_H
+#define RENDERWINDOW_H
+
+#include <QWindow>
+#include <QOpenGLVertexArrayObject>
+#include <QOpenGLBuffer>
+
+QT_FORWARD_DECLARE_CLASS(QOpenGLContext)
+QT_FORWARD_DECLARE_CLASS(QOpenGLShaderProgram)
+
+class RenderWindow : public QWindow
+{
+    Q_OBJECT
+
+public:
+    RenderWindow(const QSurfaceFormat &format);
+    QOpenGLContext *context() { return m_context; }
+    void exposeEvent(QExposeEvent *) Q_DECL_OVERRIDE;
+    void setForceGLSL110(bool enable) { m_forceGLSL110 = enable; }
+
+signals:
+    void ready();
+    void error(const QString &msg);
+
+private slots:
+    void render();
+
+private:
+    void init();
+    void setupVertexAttribs();
+
+    QOpenGLContext *m_context;
+    bool m_initialized;
+    bool m_forceGLSL110;
+    QOpenGLShaderProgram *m_program;
+    int m_posAttr, m_colAttr, m_matrixUniform;
+    QOpenGLVertexArrayObject m_vao;
+    QOpenGLBuffer m_vbo;
+    float m_angle;
+};
+
+#endif // RENDERWINDOW_H