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diff --git a/src/gui/doc/snippets/code/src_gui_opengl_qopenglfunctions.cpp b/src/gui/doc/snippets/code/src_gui_opengl_qopenglfunctions.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, 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 The Qt Company Ltd 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."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//! [0]
+    class MyGLWindow : public QWindow, protected QOpenGLFunctions
+    {
+        Q_OBJECT
+    public:
+        MyGLWindow(QScreen *screen = 0);
+
+    protected:
+        void initializeGL();
+        void paintGL();
+
+        QOpenGLContext *m_context;
+    };
+
+    MyGLWindow(QScreen *screen)
+      : QWindow(screen), QOpenGLWidget(parent)
+    {
+        setSurfaceType(OpenGLSurface);
+        create();
+
+        // Create an OpenGL context
+        m_context = new QOpenGLContext;
+        m_context->create();
+
+        // Setup scene and render it
+        initializeGL();
+        paintGL();
+    }
+
+    void MyGLWindow::initializeGL()
+    {
+        m_context->makeCurrent(this);
+        initializeOpenGLFunctions();
+    }
+//! [0]
+
+//! [1]
+    void MyGLWindow::paintGL()
+    {
+        m_context->makeCurrent(this);
+        glActiveTexture(GL_TEXTURE1);
+        glBindTexture(GL_TEXTURE_2D, textureId);
+        ...
+        m_context->swapBuffers(this);
+        m_context->doneCurrent();
+    }
+//! [1]
+
+//! [2]
+    QOpenGLFunctions glFuncs(QOpenGLContext::currentContext());
+    glFuncs.glActiveTexture(GL_TEXTURE1);
+//! [2]
+
+//! [3]
+    QOpenGLFunctions *glFuncs = QOpenGLContext::currentContext()->functions();
+    glFuncs->glActiveTexture(GL_TEXTURE1);
+//! [3]
+
+//! [4]
+    QOpenGLFunctions funcs(QOpenGLContext::currentContext());
+    bool npot = funcs.hasOpenGLFeature(QOpenGLFunctions::NPOTTextures);
+//! [4]