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diff --git a/src/opengl/doc/snippets/code/src_opengl_qgl.cpp b/src/opengl/doc/snippets/code/src_opengl_qgl.cpp
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--- a/src/opengl/doc/snippets/code/src_opengl_qgl.cpp
+++ /dev/null
@@ -1,182 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 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]
-QGLFormat fmt;
-fmt.setAlpha(true);
-fmt.setStereo(true);
-QGLFormat::setDefaultFormat(fmt);
-//! [0]
-
-
-//! [1]
-QGLFormat fmt;
-fmt.setDoubleBuffer(false); // single buffer
-fmt.setDirectRendering(false); // software rendering
-MyGLWidget* myWidget = new MyGLWidget(fmt, ...);
-//! [1]
-
-
-//! [2]
-QGLFormat fmt;
-fmt.setOverlay(true);
-fmt.setStereo(true);
-MyGLWidget* myWidget = new MyGLWidget(fmt, ...);
-if (!myWidget->format().stereo()) {
- // ok, goggles off
- if (!myWidget->format().hasOverlay()) {
- qFatal("Cool hardware required");
- }
-}
-//! [2]
-
-
-//! [3]
-// The rendering in MyGLWidget depends on using
-// stencil buffer and alpha channel
-MyGLWidget::MyGLWidget(QWidget* parent)
- : QGLWidget(QGLFormat(QGL::StencilBuffer | QGL::AlphaChannel), parent)
-{
- if (!format().stencil())
- qWarning("Could not get stencil buffer; results will be suboptimal");
- if (!format().alpha())
- qWarning("Could not get alpha channel; results will be suboptimal");
- ...
-}
-//! [3]
-
-
-//! [4]
-QApplication a(argc, argv);
-QGLFormat f;
-f.setDoubleBuffer(false);
-QGLFormat::setDefaultFormat(f);
-//! [4]
-
-
-//! [5]
-QGLFormat f = QGLFormat::defaultOverlayFormat();
-f.setDoubleBuffer(true);
-QGLFormat::setDefaultOverlayFormat(f);
-//! [5]
-
-
-//! [6]
-// ...continued from above
-MyGLWidget* myWidget = new MyGLWidget(QGLFormat(QGL::HasOverlay), ...);
-if (myWidget->format().hasOverlay()) {
- // Yes, we got an overlay, let's check _its_ format:
- QGLContext* olContext = myWidget->overlayContext();
- if (olContext->format().doubleBuffer())
- ; // yes, we got a double buffered overlay
- else
- ; // no, only single buffered overlays are available
-}
-//! [6]
-
-
-//! [7]
-QGLContext *cx;
-// ...
-QGLFormat f;
-f.setStereo(true);
-cx->setFormat(f);
-if (!cx->create())
- exit(); // no OpenGL support, or cannot render on the specified paintdevice
-if (!cx->format().stereo())
- exit(); // could not create stereo context
-//! [7]
-
-
-//! [8]
-class MyGLDrawer : public QGLWidget
-{
- Q_OBJECT // must include this if you use Qt signals/slots
-
-public:
- MyGLDrawer(QWidget *parent)
- : QGLWidget(parent) {}
-
-protected:
-
- void initializeGL() override
- {
- // Set up the rendering context, define display lists etc.:
- ...
- glClearColor(0.0, 0.0, 0.0, 0.0);
- glEnable(GL_DEPTH_TEST);
- ...
- }
-
- void resizeGL(int w, int h) override
- {
- // setup viewport, projection etc.:
- glViewport(0, 0, (GLint)w, (GLint)h);
- ...
- glFrustum(...);
- ...
- }
-
- void paintGL() override
- {
- // draw the scene:
- ...
- glRotatef(...);
- glMaterialfv(...);
- glBegin(GL_QUADS);
- glVertex3f(...);
- glVertex3f(...);
- ...
- glEnd();
- ...
- }
-
-};
-//! [8]