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diff --git a/examples/opengl/qopenglwidget/mainwindow.cpp b/examples/opengl/qopenglwidget/mainwindow.cpp
deleted file mode 100644
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--- a/examples/opengl/qopenglwidget/mainwindow.cpp
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-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the examples 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."
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#include "mainwindow.h"
-
-#include <QApplication>
-#include <QMenuBar>
-#include <QGroupBox>
-#include <QSlider>
-#include <QLabel>
-#include <QCheckBox>
-#include <QRandomGenerator>
-#include <QSpinBox>
-#include <QScrollArea>
-
-#include "glwidget.h"
-
-MainWindow::MainWindow()
- : m_nextX(1), m_nextY(1)
-{
- GLWidget *glwidget = new GLWidget(this, true, qRgb(20, 20, 50));
- m_glWidgets << glwidget;
- QLabel *label = new QLabel(this);
- m_timer = new QTimer(this);
- QSlider *slider = new QSlider(this);
- slider->setOrientation(Qt::Horizontal);
-
- QLabel *updateLabel = new QLabel("Update interval");
- QSpinBox *updateInterval = new QSpinBox(this);
- updateInterval->setSuffix(" ms");
- updateInterval->setValue(10);
- updateInterval->setToolTip("Interval for the timer that calls update().\n"
- "Note that on most systems the swap will block to wait for vsync\n"
- "and therefore an interval < 16 ms will likely lead to a 60 FPS update rate.");
- QGroupBox *updateGroupBox = new QGroupBox(this);
- QCheckBox *timerBased = new QCheckBox("Use timer", this);
- timerBased->setChecked(false);
- timerBased->setToolTip("Toggles using a timer to trigger update().\n"
- "When not set, each paintGL() schedules the next update immediately,\n"
- "expecting the blocking swap to throttle the thread.\n"
- "This shows how unnecessary the timer is in most cases.");
- QCheckBox *transparent = new QCheckBox("Transparent background", this);
- transparent->setToolTip("Toggles Qt::WA_AlwaysStackOnTop and transparent clear color for glClear().\n"
- "Note how the button on top stacks incorrectly when enabling this.");
- QHBoxLayout *updateLayout = new QHBoxLayout;
- updateLayout->addWidget(updateLabel);
- updateLayout->addWidget(updateInterval);
- updateLayout->addWidget(timerBased);
- updateLayout->addWidget(transparent);
- updateGroupBox->setLayout(updateLayout);
-
- slider->setRange(0, 50);
- slider->setSliderPosition(30);
- m_timer->setInterval(10);
- label->setText("A scrollable QOpenGLWidget");
- label->setAlignment(Qt::AlignHCenter);
-
- QGroupBox * groupBox = new QGroupBox(this);
- setCentralWidget(groupBox);
- groupBox->setTitle("QOpenGLWidget Example");
-
- m_layout = new QGridLayout(groupBox);
-
- QScrollArea *scrollArea = new QScrollArea;
- scrollArea->setWidget(glwidget);
-
- m_layout->addWidget(scrollArea,1,0,8,1);
- m_layout->addWidget(label,9,0,1,1);
- m_layout->addWidget(updateGroupBox, 10, 0, 1, 1);
- m_layout->addWidget(slider, 11,0,1,1);
-
- groupBox->setLayout(m_layout);
-
-
- QMenu *fileMenu = menuBar()->addMenu("&File");
- fileMenu->addAction("E&xit", this, &QWidget::close);
- QMenu *showMenu = menuBar()->addMenu("&Show");
- showMenu->addAction("Show 3D Logo", glwidget, &GLWidget::setLogo);
- showMenu->addAction("Show 2D Texture", glwidget, &GLWidget::setTexture);
- QAction *showBubbles = showMenu->addAction("Show bubbles", glwidget, &GLWidget::setShowBubbles);
- showBubbles->setCheckable(true);
- showBubbles->setChecked(true);
- QMenu *helpMenu = menuBar()->addMenu("&Help");
- helpMenu->addAction("About Qt", qApp, &QApplication::aboutQt);
-
- connect(m_timer, &QTimer::timeout, glwidget, QOverload<>::of(&QWidget::update));
-
- connect(slider, &QAbstractSlider::valueChanged, glwidget, &GLWidget::setScaling);
- connect(transparent, &QCheckBox::toggled, glwidget, &GLWidget::setTransparent);
- connect(updateInterval, &QSpinBox::valueChanged,
- this, &MainWindow::updateIntervalChanged);
- connect(timerBased, &QCheckBox::toggled, this, &MainWindow::timerUsageChanged);
- connect(timerBased, &QCheckBox::toggled, updateInterval, &QWidget::setEnabled);
-
- if (timerBased->isChecked())
- m_timer->start();
- else
- updateInterval->setEnabled(false);
-}
-
-void MainWindow::updateIntervalChanged(int value)
-{
- m_timer->setInterval(value);
- if (m_timer->isActive())
- m_timer->start();
-}
-
-void MainWindow::addNew()
-{
- if (m_nextY == 4)
- return;
- GLWidget *w = new GLWidget(this, false, qRgb(QRandomGenerator::global()->bounded(256),
- QRandomGenerator::global()->bounded(256),
- QRandomGenerator::global()->bounded(256)));
- m_glWidgets << w;
- connect(m_timer, &QTimer::timeout, w, QOverload<>::of(&QWidget::update));
- m_layout->addWidget(w, m_nextY, m_nextX, 1, 1);
- if (m_nextX == 3) {
- m_nextX = 1;
- ++m_nextY;
- } else {
- ++m_nextX;
- }
-}
-
-void MainWindow::timerUsageChanged(bool enabled)
-{
- if (enabled) {
- m_timer->start();
- } else {
- m_timer->stop();
- for (QOpenGLWidget *w : qAsConst(m_glWidgets))
- w->update();
- }
-}
-
-void MainWindow::resizeEvent(QResizeEvent *)
-{
- m_glWidgets[0]->setMinimumSize(size() + QSize(128, 128));
-}