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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 QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//! [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]