Modernize the OpenGL examples

Change them to use QOpenGLWidget and QOpenGLTexture. Advocate also the usage of VBOs. Hopeless examples, that rely on the fixed pipeline and will not compile or work in ES and dynamic builds, are moved to a "legacy" directory. The documentation pages for these are removed. This long due change avoids the confusion newcomers experience when trying to get started with Qt 5 and OpenGL. hellowindow's behavior is changed to open a single window only by default. The old default behavior, that opened three windows on platforms that supported both MultipleWindows & ThreadedOpenGL, can be requested by passing --multiple. --single is removed since it is the default now. This plays much nicer with drivers that have issues with threading. In addition, say hello to hellogl2. This is the old hellogl example updated to use QOpenGLWidget and OpenGL 2. It also has a mainwindow with multiple (un)dockable widgets containing the OpenGL widgets. This helps testing the behavior when the top-level of the QOpenGLWidget changes and provides a very important example of how to do proper resource management in this case. (must use aboutToBeDestroyed() of the context, since the context goes away and is replaced by a new one on every dock/undock) As a bonus, the logo is now real 3D, no more orthographic nonsense. Launch with --multisample to request 4x MSAA. Launch with --coreprofile to request 3.2 Core. In this particular example the shaders are present in both versions and there is a VAO so the application is functional with core profile contexts. Change-Id: Id780a80cb0708ef164cc172450ed74050f065596 Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>
author: Laszlo Agocs <laszlo.agocs@digia.com> 2014-08-02 19:42:15 +0200
committer: Laszlo Agocs <laszlo.agocs@digia.com> 2014-08-12 07:47:23 +0200
commit: 611558d877a9ee4448b30e5443e3025c6235daaf (patch)
tree: 2a5d5a6da4a9994ccef4a49dec235f661a1e57f1 /examples/opengl/legacy
parent: 338f9c4f7c42d2a7bcd2c5b37137b3cc7cd9775d (diff)
47 files changed, 4704 insertions, 0 deletions
diff --git a/examples/opengl/legacy/README b/examples/opengl/legacy/README
new file mode 100644
index 0000000000..8d6cbdef2a
--- /dev/null
+++ b/examples/opengl/legacy/README
@@ -0,0 +1,4 @@
+This directory contains legacy examples that use the fixed pipeline
+and thus are not compatible with OpenGL ES 2.0+ and the core profile of
+OpenGL 3.0+. They also rely on the Qt OpenGL module (e.g. QGLWidget) which
+is not advisable in new application.
diff --git a/examples/opengl/legacy/framebufferobject2/cubelogo.png b/examples/opengl/legacy/framebufferobject2/cubelogo.png
new file mode 100644
index 0000000000..3ae0f9ba3f
--- /dev/null
+++ b/examples/opengl/legacy/framebufferobject2/cubelogo.png
diff --git a/examples/opengl/legacy/framebufferobject2/framebufferobject2.pro b/examples/opengl/legacy/framebufferobject2/framebufferobject2.pro
new file mode 100644
index 0000000000..e0067cf27f
--- /dev/null
+++ b/examples/opengl/legacy/framebufferobject2/framebufferobject2.pro
@@ -0,0 +1,15 @@
+HEADERS += glwidget.h
+SOURCES += glwidget.cpp main.cpp
+RESOURCES += framebufferobject2.qrc
+
+QT += opengl widgets
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/opengl/framebufferobject2
+INSTALLS += target
+
+contains(QT_CONFIG, opengles.) {
+    contains(QT_CONFIG, angle): \
+        warning("Qt was built with ANGLE, which provides only OpenGL ES 2.0 on top of DirectX 9.0c")
+    error("This example requires Qt to be configured with -opengl desktop")
+}
diff --git a/examples/opengl/legacy/framebufferobject2/framebufferobject2.qrc b/examples/opengl/legacy/framebufferobject2/framebufferobject2.qrc
new file mode 100644
index 0000000000..9fc1a56a1a
--- /dev/null
+++ b/examples/opengl/legacy/framebufferobject2/framebufferobject2.qrc
@@ -0,0 +1,5 @@
+<!DOCTYPE RCC><RCC version="1.0">
+<qresource prefix="/res">
+   <file>cubelogo.png</file>
+</qresource>
+</RCC>
diff --git a/examples/opengl/legacy/framebufferobject2/glwidget.cpp b/examples/opengl/legacy/framebufferobject2/glwidget.cpp
new file mode 100644
index 0000000000..32b9799a4a
--- /dev/null
+++ b/examples/opengl/legacy/framebufferobject2/glwidget.cpp
@@ -0,0 +1,248 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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$
+**
+****************************************************************************/
+
+#include "glwidget.h"
+#include <QtGui/QImage>
+
+#include <math.h>
+
+static GLint cubeArray[][3] = {
+    {0, 0, 0}, {0, 1, 0}, {1, 1, 0}, {1, 0, 0},
+    {0, 0, 1}, {1, 0, 1}, {1, 1, 1}, {0, 1, 1},
+    {0, 0, 0}, {1, 0, 0}, {1, 0, 1}, {0, 0, 1},
+    {0, 1, 0}, {0, 1, 1}, {1, 1, 1}, {1, 1, 0},
+    {0, 1, 0}, {0, 0, 0}, {0, 0, 1}, {0, 1, 1},
+    {1, 0, 0}, {1, 1, 0}, {1, 1, 1}, {1, 0, 1}
+};
+
+static GLint cubeTextureArray[][2] = {
+    {0, 0}, {1, 0}, {1, 1}, {0, 1},
+    {0, 0}, {0, 1}, {1, 1}, {1, 0},
+    {0, 0}, {1, 0}, {1, 1}, {0, 1},
+    {1, 0}, {0, 0}, {0, 1}, {1, 1},
+    {0, 0}, {1, 0}, {1, 1}, {0, 1},
+    {1, 0}, {0, 0}, {0, 1}, {1, 1}
+};
+
+static GLint faceArray[][2] = {
+    {1, -1}, {1, 1}, {-1, 1}, {-1, -1}
+};
+
+static GLubyte colorArray[][4] = {
+    {102, 176, 54, 255},
+    {81, 141, 41, 255},
+    {62, 108, 32, 255},
+    {45, 79, 23, 255}
+};
+
+GLWidget::GLWidget(QWidget *parent)
+  : QGLWidget(QGLFormat(QGL::SampleBuffers), parent)
+{
+    // create the framebuffer object - make sure to have a current
+    // context before creating it
+    makeCurrent();
+    fbo = new QGLFramebufferObject(512, 512);
+    timerId = startTimer(20);
+    setWindowTitle(tr("OpenGL framebuffer objects 2"));
+}
+
+GLWidget::~GLWidget()
+{
+    glDeleteLists(pbufferList, 1);
+    delete fbo;
+}
+
+void GLWidget::initializeGL()
+{
+    glMatrixMode(GL_MODELVIEW);
+
+    glEnable(GL_CULL_FACE);
+
+    glEnableClientState(GL_VERTEX_ARRAY);
+    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+    glVertexPointer(3, GL_INT, 0, cubeArray);
+    glTexCoordPointer(2, GL_INT, 0, cubeTextureArray);
+    glColorPointer(4, GL_UNSIGNED_BYTE, 0, colorArray);
+
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    glEnable(GL_BLEND);
+    glEnable(GL_TEXTURE_2D);
+    glEnable(GL_DEPTH_TEST);
+
+    glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
+    pbufferList = glGenLists(1);
+    glNewList(pbufferList, GL_COMPILE);
+    {
+        glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
+
+        // draw cube background
+        glPushMatrix();
+        glLoadIdentity();
+        glTranslatef(0.5f, 0.5f, -2.0f);
+        glDisable(GL_TEXTURE_2D);
+        glEnableClientState(GL_COLOR_ARRAY);
+        glVertexPointer(2, GL_INT, 0, faceArray);
+        glDrawArrays(GL_QUADS, 0, 4);
+        glVertexPointer(3, GL_INT, 0, cubeArray);
+        glDisableClientState(GL_COLOR_ARRAY);
+        glEnable(GL_TEXTURE_2D);
+        glPopMatrix();
+
+        // draw cube
+        glTranslatef(0.5f, 0.5f, 0.5f);
+        glRotatef(3.0f, 1.0f, 1.0f, 1.0f);
+        glTranslatef(-0.5f, -0.5f, -0.5f);
+        glColor4f(0.9f, 0.9f, 0.9f, 1.0f);
+        glDrawArrays(GL_QUADS, 0, 24);
+
+        glPushMatrix(); // this state is popped back in the paintGL() function
+    }
+    glEndList();
+
+    for (int i = 0; i < 3; ++i) {
+        yOffs[i] = 0.0f;
+        xInc[i] = 0.005f;
+        rot[i] = 0.0f;
+    }
+    xOffs[0]= 0.0f;
+    xOffs[1]= 0.5f;
+    xOffs[2]= 1.0f;
+
+    cubeTexture = bindTexture(QImage(":res/cubelogo.png"));
+
+    glPushMatrix(); // push to avoid stack underflow in the first paintGL() call
+}
+
+void GLWidget::resizeGL(int w, int h)
+{
+    glViewport(0, 0, w, h);
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    float aspect = w/(float)(h ? h : 1);
+    glFrustum(-aspect, aspect, -1, 1, 10, 100);
+    glTranslatef(-0.5f, -0.5f, -0.5f);
+    glTranslatef(0.0f, 0.0f, -15.0f);
+}
+
+void GLWidget::paintGL()
+{
+    glPopMatrix(); // pop the matrix pushed in the pbuffer list
+
+    // push the projection matrix and the entire GL state before
+    // doing any rendering into our framebuffer object
+    glPushAttrib(GL_ALL_ATTRIB_BITS);
+    glMatrixMode(GL_PROJECTION);
+    glPushMatrix();
+
+    glViewport(0, 0, fbo->size().width(), fbo->size().height());
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    glOrtho(-1, 1, -1, 1, -99, 99);
+    glTranslatef(-0.5f, -0.5f, 0.0f);
+    glMatrixMode(GL_MODELVIEW);
+
+    // render to the framebuffer object
+    fbo->bind();
+    glBindTexture(GL_TEXTURE_2D, cubeTexture);
+    glCallList(pbufferList);
+    fbo->release();
+
+    // pop the projection matrix and GL state back for rendering
+    // to the actual widget
+    glPopAttrib();
+    glMatrixMode(GL_PROJECTION);
+    glPopMatrix();
+
+    glBindTexture(GL_TEXTURE_2D, fbo->texture());
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    // draw the background
+    glMatrixMode(GL_MODELVIEW);
+    glPushMatrix();
+    glLoadIdentity();
+    glMatrixMode(GL_PROJECTION);
+    glPushMatrix();
+    glLoadIdentity();
+
+    glVertexPointer(2, GL_INT, 0, faceArray);
+    glTranslatef(-1.2f, -0.8f, 0.0f);
+    glScalef(0.2f, 0.2f, 0.2f);
+    for (int y = 0; y < 5; ++y) {
+        for (int x = 0; x < 5; ++x) {
+            glTranslatef(2.0f, 0, 0);
+            glColor4f(0.8f, 0.8f, 0.8f, 1.0f);
+            glDrawArrays(GL_QUADS, 0, 4);
+        }
+        glTranslatef(-10.0f, 2.0f, 0);
+    }
+    glVertexPointer(3, GL_INT, 0, cubeArray);
+
+    glPopMatrix();
+    glMatrixMode(GL_MODELVIEW);
+
+    // draw the bouncing cubes
+    drawCube(0, 0.0f, 1.5f, 2.5f, 1.5f);
+    drawCube(1, 1.0f, 2.0f, 2.5f, 2.0f);
+    drawCube(2, 2.0f, 3.5f, 2.5f, 2.5f);
+    glPopMatrix();
+}
+
+void GLWidget::drawCube(int i, GLfloat z, GLfloat rotation, GLfloat jmp, GLfloat amp)
+{
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+    glTranslatef(xOffs[i], yOffs[i], z);
+    glTranslatef(0.5f, 0.5f, 0.5f);
+    GLfloat scale = 0.75 + i*(0.25f/2);
+    glScalef(scale, scale, scale);
+    glRotatef(rot[i], 1.0f, 1.0f, 1.0f);
+    glTranslatef(-0.5f, -0.5f, -0.5f);
+
+    glColor4f(1.0f, 1.0f, 1.0f, 0.8f);
+    glDrawArrays(GL_QUADS, 0, 24);
+
+    if (xOffs[i] > 1.0f || xOffs[i] < -1.0f) {
+        xInc[i] = -xInc[i];
+        xOffs[i] = xOffs[i] > 1.0f ? 1.0f : -1.0f;
+    }
+    xOffs[i] += xInc[i];
+    yOffs[i] = qAbs(cos((-3.141592f * jmp) * xOffs[i]) * amp) - 1;
+    rot[i] += rotation;
+}
diff --git a/examples/opengl/legacy/framebufferobject2/glwidget.h b/examples/opengl/legacy/framebufferobject2/glwidget.h
new file mode 100644
index 0000000000..2991a4fdf2
--- /dev/null
+++ b/examples/opengl/legacy/framebufferobject2/glwidget.h
@@ -0,0 +1,65 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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$
+**
+****************************************************************************/
+
+#include <QtOpenGL>
+
+class GLWidget : public QGLWidget
+{
+public:
+    GLWidget(QWidget *parent);
+    ~GLWidget();
+    void initializeGL() Q_DECL_OVERRIDE;
+    void resizeGL(int w, int h) Q_DECL_OVERRIDE;
+    void paintGL() Q_DECL_OVERRIDE;
+    void timerEvent(QTimerEvent *) Q_DECL_OVERRIDE { update(); }
+    void mousePressEvent(QMouseEvent *) Q_DECL_OVERRIDE { killTimer(timerId); }
+    void mouseReleaseEvent(QMouseEvent *) Q_DECL_OVERRIDE { timerId = startTimer(20); }
+
+    void drawCube(int i, GLfloat z, GLfloat ri, GLfloat jmp, GLfloat amp);
+
+private:
+    GLfloat rot[3], xOffs[3], yOffs[3], xInc[3];
+    GLuint pbufferList;
+    GLuint cubeTexture;
+    int timerId;
+
+    QGLFramebufferObject *fbo;
+};
+
diff --git a/examples/opengl/legacy/framebufferobject2/main.cpp b/examples/opengl/legacy/framebufferobject2/main.cpp
new file mode 100644
index 0000000000..4c9aa9840f
--- /dev/null
+++ b/examples/opengl/legacy/framebufferobject2/main.cpp
@@ -0,0 +1,61 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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$
+**
+****************************************************************************/
+
+#include <QtWidgets/QApplication>
+#include <QtWidgets/QMessageBox>
+#include "glwidget.h"
+
+int main(int argc, char **argv)
+{
+    Q_INIT_RESOURCE(framebufferobject2);
+
+    QApplication a(argc, argv);
+    if (!QGLFormat::hasOpenGL() || !QGLFramebufferObject::hasOpenGLFramebufferObjects()) {
+        QMessageBox::information(0, "OpenGL framebuffer objects 2",
+                                 "This system does not support OpenGL/framebuffer objects.");
+        return -1;
+    }
+
+    GLWidget widget(0);
+    widget.resize(640, 480);
+    widget.show();
+    return a.exec();
+}
+
diff --git a/examples/opengl/legacy/grabber/glwidget.cpp b/examples/opengl/legacy/grabber/glwidget.cpp
new file mode 100644
index 0000000000..abe3a8540a
--- /dev/null
+++ b/examples/opengl/legacy/grabber/glwidget.cpp
@@ -0,0 +1,278 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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$
+**
+****************************************************************************/
+
+#include "glwidget.h"
+
+#include <QMouseEvent>
+#include <QTimer>
+
+#include <math.h>
+
+GLWidget::GLWidget(QWidget *parent)
+    : QGLWidget(parent)
+{
+    gear1 = 0;
+    gear2 = 0;
+    gear3 = 0;
+    xRot = 0;
+    yRot = 0;
+    zRot = 0;
+    gear1Rot = 0;
+
+    QTimer *timer = new QTimer(this);
+    connect(timer, SIGNAL(timeout()), this, SLOT(advanceGears()));
+    timer->start(20);
+}
+
+GLWidget::~GLWidget()
+{
+    makeCurrent();
+    glDeleteLists(gear1, 1);
+    glDeleteLists(gear2, 1);
+    glDeleteLists(gear3, 1);
+}
+
+void GLWidget::setXRotation(int angle)
+{
+    normalizeAngle(&angle);
+    if (angle != xRot) {
+        xRot = angle;
+        emit xRotationChanged(angle);
+        updateGL();
+    }
+}
+
+void GLWidget::setYRotation(int angle)
+{
+    normalizeAngle(&angle);
+    if (angle != yRot) {
+        yRot = angle;
+        emit yRotationChanged(angle);
+        updateGL();
+    }
+}
+
+void GLWidget::setZRotation(int angle)
+{
+    normalizeAngle(&angle);
+    if (angle != zRot) {
+        zRot = angle;
+        emit zRotationChanged(angle);
+        updateGL();
+    }
+}
+
+void GLWidget::initializeGL()
+{
+    static const GLfloat lightPos[4] = { 5.0f, 5.0f, 10.0f, 1.0f };
+    static const GLfloat reflectance1[4] = { 0.8f, 0.1f, 0.0f, 1.0f };
+    static const GLfloat reflectance2[4] = { 0.0f, 0.8f, 0.2f, 1.0f };
+    static const GLfloat reflectance3[4] = { 0.2f, 0.2f, 1.0f, 1.0f };
+
+    glLightfv(GL_LIGHT0, GL_POSITION, lightPos);
+    glEnable(GL_LIGHTING);
+    glEnable(GL_LIGHT0);
+    glEnable(GL_DEPTH_TEST);
+
+    gear1 = makeGear(reflectance1, 1.0, 4.0, 1.0, 0.7, 20);
+    gear2 = makeGear(reflectance2, 0.5, 2.0, 2.0, 0.7, 10);
+    gear3 = makeGear(reflectance3, 1.3, 2.0, 0.5, 0.7, 10);
+
+    glEnable(GL_NORMALIZE);
+    glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
+}
+
+void GLWidget::paintGL()
+{
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    glPushMatrix();
+    glRotated(xRot / 16.0, 1.0, 0.0, 0.0);
+    glRotated(yRot / 16.0, 0.0, 1.0, 0.0);
+    glRotated(zRot / 16.0, 0.0, 0.0, 1.0);
+
+    drawGear(gear1, -3.0, -2.0, 0.0, gear1Rot / 16.0);
+    drawGear(gear2, +3.1, -2.0, 0.0, -2.0 * (gear1Rot / 16.0) - 9.0);
+
+    glRotated(+90.0, 1.0, 0.0, 0.0);
+    drawGear(gear3, -3.1, -1.8, -2.2, +2.0 * (gear1Rot / 16.0) - 2.0);
+
+    glPopMatrix();
+}
+
+void GLWidget::resizeGL(int width, int height)
+{
+    int side = qMin(width, height);
+    glViewport((width - side) / 2, (height - side) / 2, side, side);
+
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    glFrustum(-1.0, +1.0, -1.0, 1.0, 5.0, 60.0);
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+    glTranslated(0.0, 0.0, -40.0);
+}
+
+void GLWidget::mousePressEvent(QMouseEvent *event)
+{
+    lastPos = event->pos();
+}
+
+void GLWidget::mouseMoveEvent(QMouseEvent *event)
+{
+    int dx = event->x() - lastPos.x();
+    int dy = event->y() - lastPos.y();
+
+    if (event->buttons() & Qt::LeftButton) {
+        setXRotation(xRot + 8 * dy);
+        setYRotation(yRot + 8 * dx);
+    } else if (event->buttons() & Qt::RightButton) {
+        setXRotation(xRot + 8 * dy);
+        setZRotation(zRot + 8 * dx);
+    }
+    lastPos = event->pos();
+}
+
+void GLWidget::advanceGears()
+{
+    gear1Rot += 2 * 16;
+    updateGL();
+}
+
+GLuint GLWidget::makeGear(const GLfloat *reflectance, GLdouble innerRadius,
+                          GLdouble outerRadius, GLdouble thickness,
+                          GLdouble toothSize, GLint toothCount)
+{
+    const double Pi = 3.14159265358979323846;
+
+    GLuint list = glGenLists(1);
+    glNewList(list, GL_COMPILE);
+    glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, reflectance);
+
+    GLdouble r0 = innerRadius;
+    GLdouble r1 = outerRadius - toothSize / 2.0;
+    GLdouble r2 = outerRadius + toothSize / 2.0;
+    GLdouble delta = (2.0 * Pi / toothCount) / 4.0;
+    GLdouble z = thickness / 2.0;
+
+    glShadeModel(GL_FLAT);
+
+    for (int i = 0; i < 2; ++i) {
+        GLdouble sign = (i == 0) ? +1.0 : -1.0;
+
+        glNormal3d(0.0, 0.0, sign);
+
+        glBegin(GL_QUAD_STRIP);
+        for (int j = 0; j <= toothCount; ++j) {
+            GLdouble angle = 2.0 * Pi * j / toothCount;
+            glVertex3d(r0 * cos(angle), r0 * sin(angle), sign * z);
+            glVertex3d(r1 * cos(angle), r1 * sin(angle), sign * z);
+            glVertex3d(r0 * cos(angle), r0 * sin(angle), sign * z);
+            glVertex3d(r1 * cos(angle + 3 * delta), r1 * sin(angle + 3 * delta), sign * z);
+        }
+        glEnd();
+
+        glBegin(GL_QUADS);
+        for (int j = 0; j < toothCount; ++j) {
+            GLdouble angle = 2.0 * Pi * j / toothCount;
+            glVertex3d(r1 * cos(angle), r1 * sin(angle), sign * z);
+            glVertex3d(r2 * cos(angle + delta), r2 * sin(angle + delta), sign * z);
+            glVertex3d(r2 * cos(angle + 2 * delta), r2 * sin(angle + 2 * delta), sign * z);
+            glVertex3d(r1 * cos(angle + 3 * delta), r1 * sin(angle + 3 * delta), sign * z);
+        }
+        glEnd();
+    }
+
+    glBegin(GL_QUAD_STRIP);
+    for (int i = 0; i < toothCount; ++i) {
+        for (int j = 0; j < 2; ++j) {
+            GLdouble angle = 2.0 * Pi * (i + j / 2.0) / toothCount;
+            GLdouble s1 = r1;
+            GLdouble s2 = r2;
+            if (j == 1)
+                qSwap(s1, s2);
+
+            glNormal3d(cos(angle), sin(angle), 0.0);
+            glVertex3d(s1 * cos(angle), s1 * sin(angle), +z);
+            glVertex3d(s1 * cos(angle), s1 * sin(angle), -z);
+
+            glNormal3d(s2 * sin(angle + delta) - s1 * sin(angle),
+                       s1 * cos(angle) - s2 * cos(angle + delta), 0.0);
+            glVertex3d(s2 * cos(angle + delta), s2 * sin(angle + delta), +z);
+            glVertex3d(s2 * cos(angle + delta), s2 * sin(angle + delta), -z);
+        }
+    }
+    glVertex3d(r1, 0.0, +z);
+    glVertex3d(r1, 0.0, -z);
+    glEnd();
+
+    glShadeModel(GL_SMOOTH);
+
+    glBegin(GL_QUAD_STRIP);
+    for (int i = 0; i <= toothCount; ++i) {
+        GLdouble angle = i * 2.0 * Pi / toothCount;
+        glNormal3d(-cos(angle), -sin(angle), 0.0);
+        glVertex3d(r0 * cos(angle), r0 * sin(angle), +z);
+        glVertex3d(r0 * cos(angle), r0 * sin(angle), -z);
+    }
+    glEnd();
+
+    glEndList();
+
+    return list;
+}
+
+void GLWidget::drawGear(GLuint gear, GLdouble dx, GLdouble dy, GLdouble dz,
+                        GLdouble angle)
+{
+    glPushMatrix();
+    glTranslated(dx, dy, dz);
+    glRotated(angle, 0.0, 0.0, 1.0);
+    glCallList(gear);
+    glPopMatrix();
+}
+
+void GLWidget::normalizeAngle(int *angle)
+{
+    while (*angle < 0)
+        *angle += 360 * 16;
+    while (*angle > 360 * 16)
+        *angle -= 360 * 16;
+}
diff --git a/examples/opengl/legacy/grabber/glwidget.h b/examples/opengl/legacy/grabber/glwidget.h
new file mode 100644
index 0000000000..12071be173
--- /dev/null
+++ b/examples/opengl/legacy/grabber/glwidget.h
@@ -0,0 +1,97 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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 GLWIDGET_H
+#define GLWIDGET_H
+
+#include <QGLWidget>
+
+class GLWidget : public QGLWidget
+{
+    Q_OBJECT
+
+public:
+    GLWidget(QWidget *parent = 0);
+    ~GLWidget();
+
+    int xRotation() const { return xRot; }
+    int yRotation() const { return yRot; }
+    int zRotation() const { return zRot; }
+
+public slots:
+    void setXRotation(int angle);
+    void setYRotation(int angle);
+    void setZRotation(int angle);
+
+signals:
+    void xRotationChanged(int angle);
+    void yRotationChanged(int angle);
+    void zRotationChanged(int angle);
+
+protected:
+    void initializeGL() Q_DECL_OVERRIDE;
+    void paintGL() Q_DECL_OVERRIDE;
+    void resizeGL(int width, int height) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+
+private slots:
+    void advanceGears();
+
+private:
+    GLuint makeGear(const GLfloat *reflectance, GLdouble innerRadius,
+                    GLdouble outerRadius, GLdouble thickness,
+                    GLdouble toothSize, GLint toothCount);
+    void drawGear(GLuint gear, GLdouble dx, GLdouble dy, GLdouble dz,
+                  GLdouble angle);
+    void normalizeAngle(int *angle);
+
+    GLuint gear1;
+    GLuint gear2;
+    GLuint gear3;
+    int xRot;
+    int yRot;
+    int zRot;
+    int gear1Rot;
+
+    QPoint lastPos;
+};
+
+#endif // GLWIDGET_H
diff --git a/examples/opengl/legacy/grabber/grabber.pro b/examples/opengl/legacy/grabber/grabber.pro
new file mode 100644
index 0000000000..b8567580f0
--- /dev/null
+++ b/examples/opengl/legacy/grabber/grabber.pro
@@ -0,0 +1,16 @@
+HEADERS       = glwidget.h \
+                mainwindow.h
+SOURCES       = glwidget.cpp \
+                main.cpp \
+                mainwindow.cpp
+QT           += opengl widgets
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/opengl/grabber
+INSTALLS += target
+
+contains(QT_CONFIG, opengles.) {
+    contains(QT_CONFIG, angle): \
+        warning("Qt was built with ANGLE, which provides only OpenGL ES 2.0 on top of DirectX 9.0c")
+    error("This example requires Qt to be configured with -opengl desktop")
+}
diff --git a/examples/opengl/legacy/grabber/main.cpp b/examples/opengl/legacy/grabber/main.cpp
new file mode 100644
index 0000000000..145e4120ef
--- /dev/null
+++ b/examples/opengl/legacy/grabber/main.cpp
@@ -0,0 +1,51 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "mainwindow.h"
+
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+    MainWindow window;
+    window.show();
+    return app.exec();
+}
diff --git a/examples/opengl/legacy/grabber/mainwindow.cpp b/examples/opengl/legacy/grabber/mainwindow.cpp
new file mode 100644
index 0000000000..9f82ee10ba
--- /dev/null
+++ b/examples/opengl/legacy/grabber/mainwindow.cpp
@@ -0,0 +1,205 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "glwidget.h"
+#include "mainwindow.h"
+
+#include <QtWidgets>
+
+MainWindow::MainWindow()
+{
+    centralWidget = new QWidget;
+    setCentralWidget(centralWidget);
+
+    glWidget = new GLWidget;
+    pixmapLabel = new QLabel;
+
+    glWidgetArea = new QScrollArea;
+    glWidgetArea->setWidget(glWidget);
+    glWidgetArea->setWidgetResizable(true);
+    glWidgetArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+    glWidgetArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+    glWidgetArea->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
+    glWidgetArea->setMinimumSize(50, 50);
+
+    pixmapLabelArea = new QScrollArea;
+    pixmapLabelArea->setWidget(pixmapLabel);
+    pixmapLabelArea->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);
+    pixmapLabelArea->setMinimumSize(50, 50);
+
+    xSlider = createSlider(SIGNAL(xRotationChanged(int)),
+                           SLOT(setXRotation(int)));
+    ySlider = createSlider(SIGNAL(yRotationChanged(int)),
+                           SLOT(setYRotation(int)));
+    zSlider = createSlider(SIGNAL(zRotationChanged(int)),
+                           SLOT(setZRotation(int)));
+
+    createActions();
+    createMenus();
+
+    QGridLayout *centralLayout = new QGridLayout;
+    centralLayout->addWidget(glWidgetArea, 0, 0);
+    centralLayout->addWidget(pixmapLabelArea, 0, 1);
+    centralLayout->addWidget(xSlider, 1, 0, 1, 2);
+    centralLayout->addWidget(ySlider, 2, 0, 1, 2);
+    centralLayout->addWidget(zSlider, 3, 0, 1, 2);
+    centralWidget->setLayout(centralLayout);
+
+    xSlider->setValue(15 * 16);
+    ySlider->setValue(345 * 16);
+    zSlider->setValue(0 * 16);
+
+    setWindowTitle(tr("Grabber"));
+    resize(400, 300);
+}
+
+void MainWindow::renderIntoPixmap()
+{
+    QSize size = getSize();
+    if (size.isValid()) {
+        QPixmap pixmap = glWidget->renderPixmap(size.width(), size.height());
+        setPixmap(pixmap);
+    }
+}
+
+void MainWindow::grabFrameBuffer()
+{
+    QImage image = glWidget->grabFrameBuffer();
+    setPixmap(QPixmap::fromImage(image));
+}
+
+void MainWindow::clearPixmap()
+{
+    setPixmap(QPixmap());
+}
+
+void MainWindow::about()
+{
+    QMessageBox::about(this, tr("About Grabber"),
+            tr("The <b>Grabber</b> example demonstrates two approaches for "
+               "rendering OpenGL into a Qt pixmap."));
+}
+
+void MainWindow::createActions()
+{
+    renderIntoPixmapAct = new QAction(tr("&Render into Pixmap..."), this);
+    renderIntoPixmapAct->setShortcut(tr("Ctrl+R"));
+    connect(renderIntoPixmapAct, SIGNAL(triggered()),
+            this, SLOT(renderIntoPixmap()));
+
+    grabFrameBufferAct = new QAction(tr("&Grab Frame Buffer"), this);
+    grabFrameBufferAct->setShortcut(tr("Ctrl+G"));
+    connect(grabFrameBufferAct, SIGNAL(triggered()),
+            this, SLOT(grabFrameBuffer()));
+
+    clearPixmapAct = new QAction(tr("&Clear Pixmap"), this);
+    clearPixmapAct->setShortcut(tr("Ctrl+L"));
+    connect(clearPixmapAct, SIGNAL(triggered()), this, SLOT(clearPixmap()));
+
+    exitAct = new QAction(tr("E&xit"), this);
+    exitAct->setShortcuts(QKeySequence::Quit);
+    connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));
+
+    aboutAct = new QAction(tr("&About"), this);
+    connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));
+
+    aboutQtAct = new QAction(tr("About &Qt"), this);
+    connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
+}
+
+void MainWindow::createMenus()
+{
+    fileMenu = menuBar()->addMenu(tr("&File"));
+    fileMenu->addAction(renderIntoPixmapAct);
+    fileMenu->addAction(grabFrameBufferAct);
+    fileMenu->addAction(clearPixmapAct);
+    fileMenu->addSeparator();
+    fileMenu->addAction(exitAct);
+
+    helpMenu = menuBar()->addMenu(tr("&Help"));
+    helpMenu->addAction(aboutAct);
+    helpMenu->addAction(aboutQtAct);
+}
+
+QSlider *MainWindow::createSlider(const char *changedSignal,
+                                  const char *setterSlot)
+{
+    QSlider *slider = new QSlider(Qt::Horizontal);
+    slider->setRange(0, 360 * 16);
+    slider->setSingleStep(16);
+    slider->setPageStep(15 * 16);
+    slider->setTickInterval(15 * 16);
+    slider->setTickPosition(QSlider::TicksRight);
+    connect(slider, SIGNAL(valueChanged(int)), glWidget, setterSlot);
+    connect(glWidget, changedSignal, slider, SLOT(setValue(int)));
+    return slider;
+}
+
+void MainWindow::setPixmap(const QPixmap &pixmap)
+{
+    pixmapLabel->setPixmap(pixmap);
+    QSize size = pixmap.size() / pixmap.devicePixelRatio();
+    if (size - QSize(1, 0) == pixmapLabelArea->maximumViewportSize())
+        size -= QSize(1, 0);
+    pixmapLabel->resize(size);
+}
+
+QSize MainWindow::getSize()
+{
+    bool ok;
+    QString text = QInputDialog::getText(this, tr("Grabber"),
+                                         tr("Enter pixmap size:"),
+                                         QLineEdit::Normal,
+                                         tr("%1 x %2").arg(glWidget->width())
+                                                      .arg(glWidget->height()),
+                                         &ok);
+    if (!ok)
+        return QSize();
+
+    QRegExp regExp(tr("([0-9]+) *x *([0-9]+)"));
+    if (regExp.exactMatch(text)) {
+        int width = regExp.cap(1).toInt();
+        int height = regExp.cap(2).toInt();
+        if (width > 0 && width < 2048 && height > 0 && height < 2048)
+            return QSize(width, height);
+    }
+
+    return glWidget->size();
+}
diff --git a/examples/opengl/legacy/grabber/mainwindow.h b/examples/opengl/legacy/grabber/mainwindow.h
new file mode 100644
index 0000000000..a7895bf4c4
--- /dev/null
+++ b/examples/opengl/legacy/grabber/mainwindow.h
@@ -0,0 +1,94 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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 MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+
+QT_BEGIN_NAMESPACE
+class QLabel;
+class QMenu;
+class QScrollArea;
+class QSlider;
+QT_END_NAMESPACE
+
+class GLWidget;
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    MainWindow();
+
+private slots:
+    void renderIntoPixmap();
+    void grabFrameBuffer();
+    void clearPixmap();
+    void about();
+
+private:
+    void createActions();
+    void createMenus();
+    QSlider *createSlider(const char *changedSignal, const char *setterSlot);
+    void setPixmap(const QPixmap &pixmap);
+    QSize getSize();
+
+    QWidget *centralWidget;
+    QScrollArea *glWidgetArea;
+    QScrollArea *pixmapLabelArea;
+    GLWidget *glWidget;
+    QLabel *pixmapLabel;
+    QSlider *xSlider;
+    QSlider *ySlider;
+    QSlider *zSlider;
+
+    QMenu *fileMenu;
+    QMenu *helpMenu;
+    QAction *grabFrameBufferAct;
+    QAction *renderIntoPixmapAct;
+    QAction *clearPixmapAct;
+    QAction *exitAct;
+    QAction *aboutAct;
+    QAction *aboutQtAct;
+};
+
+#endif // MAINWINDOW_H
diff --git a/examples/opengl/legacy/hellogl/glwidget.cpp b/examples/opengl/legacy/hellogl/glwidget.cpp
new file mode 100644
index 0000000000..3a9faaca5f
--- /dev/null
+++ b/examples/opengl/legacy/hellogl/glwidget.cpp
@@ -0,0 +1,199 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtWidgets>
+#include <QtOpenGL>
+
+#include <math.h>
+
+#include "glwidget.h"
+#include "qtlogo.h"
+
+#ifndef GL_MULTISAMPLE
+#define GL_MULTISAMPLE  0x809D
+#endif
+
+//! [0]
+GLWidget::GLWidget(QWidget *parent)
+    : QGLWidget(QGLFormat(QGL::SampleBuffers), parent)
+{
+    logo = 0;
+    xRot = 0;
+    yRot = 0;
+    zRot = 0;
+
+    qtGreen = QColor::fromCmykF(0.40, 0.0, 1.0, 0.0);
+    qtPurple = QColor::fromCmykF(0.39, 0.39, 0.0, 0.0);
+}
+//! [0]
+
+//! [1]
+GLWidget::~GLWidget()
+{
+}
+//! [1]
+
+//! [2]
+QSize GLWidget::minimumSizeHint() const
+{
+    return QSize(50, 50);
+}
+//! [2]
+
+//! [3]
+QSize GLWidget::sizeHint() const
+//! [3] //! [4]
+{
+    return QSize(400, 400);
+}
+//! [4]
+
+static void qNormalizeAngle(int &angle)
+{
+    while (angle < 0)
+        angle += 360 * 16;
+    while (angle > 360 * 16)
+        angle -= 360 * 16;
+}
+
+//! [5]
+void GLWidget::setXRotation(int angle)
+{
+    qNormalizeAngle(angle);
+    if (angle != xRot) {
+        xRot = angle;
+        emit xRotationChanged(angle);
+        update();
+    }
+}
+//! [5]
+
+void GLWidget::setYRotation(int angle)
+{
+    qNormalizeAngle(angle);
+    if (angle != yRot) {
+        yRot = angle;
+        emit yRotationChanged(angle);
+        update();
+    }
+}
+
+void GLWidget::setZRotation(int angle)
+{
+    qNormalizeAngle(angle);
+    if (angle != zRot) {
+        zRot = angle;
+        emit zRotationChanged(angle);
+        update();
+    }
+}
+
+//! [6]
+void GLWidget::initializeGL()
+{
+    qglClearColor(qtPurple.dark());
+
+    logo = new QtLogo(this, 64);
+    logo->setColor(qtGreen.dark());
+
+    glEnable(GL_DEPTH_TEST);
+    glEnable(GL_CULL_FACE);
+    glShadeModel(GL_SMOOTH);
+    glEnable(GL_LIGHTING);
+    glEnable(GL_LIGHT0);
+    glEnable(GL_MULTISAMPLE);
+    static GLfloat lightPosition[4] = { 0.5, 5.0, 7.0, 1.0 };
+    glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);
+}
+//! [6]
+
+//! [7]
+void GLWidget::paintGL()
+{
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    glLoadIdentity();
+    glTranslatef(0.0, 0.0, -10.0);
+    glRotatef(xRot / 16.0, 1.0, 0.0, 0.0);
+    glRotatef(yRot / 16.0, 0.0, 1.0, 0.0);
+    glRotatef(zRot / 16.0, 0.0, 0.0, 1.0);
+    logo->draw();
+}
+//! [7]
+
+//! [8]
+void GLWidget::resizeGL(int width, int height)
+{
+    int side = qMin(width, height);
+    glViewport((width - side) / 2, (height - side) / 2, side, side);
+
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+#ifdef QT_OPENGL_ES_1
+    glOrthof(-0.5, +0.5, -0.5, +0.5, 4.0, 15.0);
+#else
+    glOrtho(-0.5, +0.5, -0.5, +0.5, 4.0, 15.0);
+#endif
+    glMatrixMode(GL_MODELVIEW);
+}
+//! [8]
+
+//! [9]
+void GLWidget::mousePressEvent(QMouseEvent *event)
+{
+    lastPos = event->pos();
+}
+//! [9]
+
+//! [10]
+void GLWidget::mouseMoveEvent(QMouseEvent *event)
+{
+    int dx = event->x() - lastPos.x();
+    int dy = event->y() - lastPos.y();
+
+    if (event->buttons() & Qt::LeftButton) {
+        setXRotation(xRot + 8 * dy);
+        setYRotation(yRot + 8 * dx);
+    } else if (event->buttons() & Qt::RightButton) {
+        setXRotation(xRot + 8 * dy);
+        setZRotation(zRot + 8 * dx);
+    }
+    lastPos = event->pos();
+}
+//! [10]
diff --git a/examples/opengl/legacy/hellogl/glwidget.h b/examples/opengl/legacy/hellogl/glwidget.h
new file mode 100644
index 0000000000..0989be1dc6
--- /dev/null
+++ b/examples/opengl/legacy/hellogl/glwidget.h
@@ -0,0 +1,94 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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 GLWIDGET_H
+#define GLWIDGET_H
+
+#include <QGLWidget>
+
+class QtLogo;
+
+//! [0]
+class GLWidget : public QGLWidget
+{
+    Q_OBJECT
+
+public:
+    GLWidget(QWidget *parent = 0);
+    ~GLWidget();
+
+    QSize minimumSizeHint() const Q_DECL_OVERRIDE;
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+//! [0]
+
+//! [1]
+public slots:
+    void setXRotation(int angle);
+    void setYRotation(int angle);
+    void setZRotation(int angle);
+
+signals:
+    void xRotationChanged(int angle);
+    void yRotationChanged(int angle);
+    void zRotationChanged(int angle);
+//! [1]
+
+//! [2]
+protected:
+    void initializeGL() Q_DECL_OVERRIDE;
+    void paintGL() Q_DECL_OVERRIDE;
+    void resizeGL(int width, int height) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+//! [2]
+
+//! [3]
+private:
+    QtLogo *logo;
+    int xRot;
+    int yRot;
+    int zRot;
+    QPoint lastPos;
+    QColor qtGreen;
+    QColor qtPurple;
+};
+//! [3]
+
+#endif
diff --git a/examples/opengl/legacy/hellogl/hellogl.pro b/examples/opengl/legacy/hellogl/hellogl.pro
new file mode 100644
index 0000000000..500bd85b3c
--- /dev/null
+++ b/examples/opengl/legacy/hellogl/hellogl.pro
@@ -0,0 +1,21 @@
+VPATH += ../shared
+INCLUDEPATH += ../shared
+
+HEADERS       = glwidget.h \
+                window.h \
+                qtlogo.h
+SOURCES       = glwidget.cpp \
+                main.cpp \
+                window.cpp \
+                qtlogo.cpp
+QT           += opengl widgets
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/opengl/hellogl
+INSTALLS += target
+
+contains(QT_CONFIG, opengles.) {
+    contains(QT_CONFIG, angle): \
+        warning("Qt was built with ANGLE, which provides only OpenGL ES 2.0 on top of DirectX 9.0c")
+    error("This example requires Qt to be configured with -opengl desktop")
+}
diff --git a/examples/opengl/legacy/hellogl/main.cpp b/examples/opengl/legacy/hellogl/main.cpp
new file mode 100644
index 0000000000..2e83a11e95
--- /dev/null
+++ b/examples/opengl/legacy/hellogl/main.cpp
@@ -0,0 +1,59 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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$
+**
+****************************************************************************/
+
+#include <QApplication>
+#include <QDesktopWidget>
+
+#include "window.h"
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+    Window window;
+    window.resize(window.sizeHint());
+    int desktopArea = QApplication::desktop()->width() *
+                     QApplication::desktop()->height();
+    int widgetArea = window.width() * window.height();
+    if (((float)widgetArea / (float)desktopArea) < 0.75f)
+        window.show();
+    else
+        window.showMaximized();
+    return app.exec();
+}
diff --git a/examples/opengl/legacy/hellogl/window.cpp b/examples/opengl/legacy/hellogl/window.cpp
new file mode 100644
index 0000000000..2a85bbec57
--- /dev/null
+++ b/examples/opengl/legacy/hellogl/window.cpp
@@ -0,0 +1,97 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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$
+**
+****************************************************************************/
+
+#include <QtWidgets>
+
+#include "glwidget.h"
+#include "window.h"
+
+//! [0]
+Window::Window()
+{
+    glWidget = new GLWidget;
+
+    xSlider = createSlider();
+    ySlider = createSlider();
+    zSlider = createSlider();
+
+    connect(xSlider, SIGNAL(valueChanged(int)), glWidget, SLOT(setXRotation(int)));
+    connect(glWidget, SIGNAL(xRotationChanged(int)), xSlider, SLOT(setValue(int)));
+    connect(ySlider, SIGNAL(valueChanged(int)), glWidget, SLOT(setYRotation(int)));
+    connect(glWidget, SIGNAL(yRotationChanged(int)), ySlider, SLOT(setValue(int)));
+    connect(zSlider, SIGNAL(valueChanged(int)), glWidget, SLOT(setZRotation(int)));
+    connect(glWidget, SIGNAL(zRotationChanged(int)), zSlider, SLOT(setValue(int)));
+//! [0]
+
+//! [1]
+    QHBoxLayout *mainLayout = new QHBoxLayout;
+    mainLayout->addWidget(glWidget);
+    mainLayout->addWidget(xSlider);
+    mainLayout->addWidget(ySlider);
+    mainLayout->addWidget(zSlider);
+    setLayout(mainLayout);
+
+    xSlider->setValue(15 * 16);
+    ySlider->setValue(345 * 16);
+    zSlider->setValue(0 * 16);
+    setWindowTitle(tr("Hello GL"));
+}
+//! [1]
+
+//! [2]
+QSlider *Window::createSlider()
+{
+    QSlider *slider = new QSlider(Qt::Vertical);
+    slider->setRange(0, 360 * 16);
+    slider->setSingleStep(16);
+    slider->setPageStep(15 * 16);
+    slider->setTickInterval(15 * 16);
+    slider->setTickPosition(QSlider::TicksRight);
+    return slider;
+}
+//! [2]
+
+void Window::keyPressEvent(QKeyEvent *e)
+{
+    if (e->key() == Qt::Key_Escape)
+        close();
+    else
+        QWidget::keyPressEvent(e);
+}
diff --git a/examples/opengl/legacy/hellogl/window.h b/examples/opengl/legacy/hellogl/window.h
new file mode 100644
index 0000000000..900e6b13fc
--- /dev/null
+++ b/examples/opengl/legacy/hellogl/window.h
@@ -0,0 +1,72 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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 WINDOW_H
+#define WINDOW_H
+
+#include <QWidget>
+
+QT_BEGIN_NAMESPACE
+class QSlider;
+QT_END_NAMESPACE
+//! [0]
+class GLWidget;
+
+class Window : public QWidget
+{
+    Q_OBJECT
+
+public:
+    Window();
+
+protected:
+    void keyPressEvent(QKeyEvent *event) Q_DECL_OVERRIDE;
+
+private:
+    QSlider *createSlider();
+
+    GLWidget *glWidget;
+    QSlider *xSlider;
+    QSlider *ySlider;
+    QSlider *zSlider;
+};
+//! [0]
+
+#endif
diff --git a/examples/opengl/legacy/legacy.pro b/examples/opengl/legacy/legacy.pro
new file mode 100644
index 0000000000..0a74d50f7f
--- /dev/null
+++ b/examples/opengl/legacy/legacy.pro
@@ -0,0 +1,16 @@
+requires(qtHaveModule(opengl))
+
+TEMPLATE      = subdirs
+
+!contains(QT_CONFIG, dynamicgl): !contains(QT_CONFIG, opengles2) {
+    # legacy desktop-only examples, no dynamic GL support
+    SUBDIRS   = \
+                grabber \
+                hellogl \
+                overpainting \
+                pbuffers \
+                framebufferobject2 \
+                samplebuffers
+}
+
+EXAMPLE_FILES = shared
diff --git a/examples/opengl/legacy/overpainting/bubble.cpp b/examples/opengl/legacy/overpainting/bubble.cpp
new file mode 100644
index 0000000000..dbcb72bc93
--- /dev/null
+++ b/examples/opengl/legacy/overpainting/bubble.cpp
@@ -0,0 +1,110 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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$
+**
+****************************************************************************/
+
+#include "bubble.h"
+
+Bubble::Bubble(const QPointF &position, qreal radius, const QPointF &velocity)
+    : position(position), vel(velocity), radius(radius)
+{
+    innerColor = randomColor();
+    outerColor = randomColor();
+    updateBrush();
+}
+
+void Bubble::updateBrush()
+{
+    QRadialGradient gradient(QPointF(radius, radius), radius,
+                             QPointF(radius*0.5, radius*0.5));
+
+    gradient.setColorAt(0, QColor(255, 255, 255, 255));
+    gradient.setColorAt(0.25, innerColor);
+    gradient.setColorAt(1, outerColor);
+    brush = QBrush(gradient);
+}
+
+void Bubble::drawBubble(QPainter *painter)
+{
+    painter->save();
+    painter->translate(position.x() - radius, position.y() - radius);
+    painter->setBrush(brush);
+    painter->drawEllipse(0, 0, int(2*radius), int(2*radius));
+    painter->restore();
+}
+
+QColor Bubble::randomColor()
+{
+    int red = int(205 + 50.0*qrand()/(RAND_MAX+1.0));
+    int green = int(205 + 50.0*qrand()/(RAND_MAX+1.0));
+    int blue = int(205 + 50.0*qrand()/(RAND_MAX+1.0));
+    int alpha = int(91 + 100.0*qrand()/(RAND_MAX+1.0));
+
+    return QColor(red, green, blue, alpha);
+}
+
+void Bubble::move(const QRect &bbox)
+{
+    position += vel;
+    qreal leftOverflow = position.x() - radius - bbox.left();
+    qreal rightOverflow = position.x() + radius - bbox.right();
+    qreal topOverflow = position.y() - radius - bbox.top();
+    qreal bottomOverflow = position.y() + radius - bbox.bottom();
+
+    if (leftOverflow < 0.0) {
+        position.setX(position.x() - 2 * leftOverflow);
+        vel.setX(-vel.x());
+    } else if (rightOverflow > 0.0) {
+        position.setX(position.x() - 2 * rightOverflow);
+        vel.setX(-vel.x());
+    }
+
+    if (topOverflow < 0.0) {
+        position.setY(position.y() - 2 * topOverflow);
+        vel.setY(-vel.y());
+    } else if (bottomOverflow > 0.0) {
+        position.setY(position.y() - 2 * bottomOverflow);
+        vel.setY(-vel.y());
+    }
+}
+
+QRectF Bubble::rect()
+{
+    return QRectF(position.x() - radius, position.y() - radius,
+                  2 * radius, 2 * radius);
+}
diff --git a/examples/opengl/legacy/overpainting/bubble.h b/examples/opengl/legacy/overpainting/bubble.h
new file mode 100644
index 0000000000..10d24b8af7
--- /dev/null
+++ b/examples/opengl/legacy/overpainting/bubble.h
@@ -0,0 +1,67 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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 BUBBLE_H
+#define BUBBLE_H
+
+#include <QPainter>
+
+class Bubble
+{
+public:
+    Bubble(const QPointF &position, qreal radius, const QPointF &velocity);
+
+    void drawBubble(QPainter *painter);
+    void updateBrush();
+    void move(const QRect &bbox);
+    QRectF rect();
+
+private:
+    QColor randomColor();
+
+    QBrush brush;
+    QPointF position;
+    QPointF vel;
+    qreal radius;
+    QColor innerColor;
+    QColor outerColor;
+};
+
+#endif // BUBBLE_H
diff --git a/examples/opengl/legacy/overpainting/glwidget.cpp b/examples/opengl/legacy/overpainting/glwidget.cpp
new file mode 100644
index 0000000000..420ae3e881
--- /dev/null
+++ b/examples/opengl/legacy/overpainting/glwidget.cpp
@@ -0,0 +1,285 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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$
+**
+****************************************************************************/
+
+#include "bubble.h"
+#include "qtlogo.h"
+#include "glwidget.h"
+
+#include <QMouseEvent>
+#include <QTime>
+
+#include <math.h>
+#include <stdlib.h>
+
+#ifndef GL_MULTISAMPLE
+#define GL_MULTISAMPLE  0x809D
+#endif
+
+//! [0]
+GLWidget::GLWidget(QWidget *parent)
+    : QGLWidget(QGLFormat(QGL::SampleBuffers), parent)
+{
+    QTime midnight(0, 0, 0);
+    qsrand(midnight.secsTo(QTime::currentTime()));
+
+    logo = 0;
+    xRot = 0;
+    yRot = 0;
+    zRot = 0;
+
+    qtGreen = QColor::fromCmykF(0.40, 0.0, 1.0, 0.0);
+    qtPurple = QColor::fromCmykF(0.39, 0.39, 0.0, 0.0);
+
+    animationTimer.setSingleShot(false);
+    connect(&animationTimer, SIGNAL(timeout()), this, SLOT(animate()));
+    animationTimer.start(25);
+
+    setAutoFillBackground(false);
+    setMinimumSize(200, 200);
+    setWindowTitle(tr("Overpainting a Scene"));
+}
+//! [0]
+
+//! [1]
+GLWidget::~GLWidget()
+{
+}
+//! [1]
+
+static void qNormalizeAngle(int &angle)
+{
+    while (angle < 0)
+        angle += 360 * 16;
+    while (angle > 360 * 16)
+        angle -= 360 * 16;
+}
+
+void GLWidget::setXRotation(int angle)
+{
+    qNormalizeAngle(angle);
+    if (angle != xRot)
+        xRot = angle;
+}
+
+void GLWidget::setYRotation(int angle)
+{
+    qNormalizeAngle(angle);
+    if (angle != yRot)
+        yRot = angle;
+}
+
+void GLWidget::setZRotation(int angle)
+{
+    qNormalizeAngle(angle);
+    if (angle != zRot)
+        zRot = angle;
+}
+
+//! [2]
+void GLWidget::initializeGL()
+{
+    glEnable(GL_MULTISAMPLE);
+
+    logo = new QtLogo(this);
+    logo->setColor(qtGreen.dark());
+}
+//! [2]
+
+void GLWidget::mousePressEvent(QMouseEvent *event)
+{
+    lastPos = event->pos();
+}
+
+void GLWidget::mouseMoveEvent(QMouseEvent *event)
+{
+    int dx = event->x() - lastPos.x();
+    int dy = event->y() - lastPos.y();
+
+    if (event->buttons() & Qt::LeftButton) {
+        setXRotation(xRot + 8 * dy);
+        setYRotation(yRot + 8 * dx);
+    } else if (event->buttons() & Qt::RightButton) {
+        setXRotation(xRot + 8 * dy);
+        setZRotation(zRot + 8 * dx);
+    }
+    lastPos = event->pos();
+}
+
+void GLWidget::paintEvent(QPaintEvent *event)
+{
+    makeCurrent();
+//! [4]
+    glMatrixMode(GL_MODELVIEW);
+    glPushMatrix();
+//! [4]
+
+//! [6]
+    qglClearColor(qtPurple.dark());
+    glShadeModel(GL_SMOOTH);
+    glEnable(GL_DEPTH_TEST);
+    glEnable(GL_CULL_FACE);
+    glEnable(GL_LIGHTING);
+    glEnable(GL_LIGHT0);
+    glEnable(GL_MULTISAMPLE);
+    static GLfloat lightPosition[4] = { 0.5, 5.0, 7.0, 1.0 };
+    glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);
+
+    qreal pixelRatio = devicePixelRatio();
+    setupViewport(width() * pixelRatio, height() * pixelRatio);
+//! [6]
+
+//! [7]
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    glLoadIdentity();
+    glTranslatef(0.0, 0.0, -10.0);
+    glRotatef(xRot / 16.0, 1.0, 0.0, 0.0);
+    glRotatef(yRot / 16.0, 0.0, 1.0, 0.0);
+    glRotatef(zRot / 16.0, 0.0, 0.0, 1.0);
+
+    logo->draw();
+//! [7]
+
+//! [8]
+    glShadeModel(GL_FLAT);
+    glDisable(GL_CULL_FACE);
+    glDisable(GL_DEPTH_TEST);
+    glDisable(GL_LIGHTING);
+
+    glMatrixMode(GL_MODELVIEW);
+    glPopMatrix();
+//! [8]
+
+//! [10]
+    QPainter painter(this);
+    painter.setRenderHint(QPainter::Antialiasing);
+    foreach (Bubble *bubble, bubbles) {
+        if (bubble->rect().intersects(event->rect()))
+            bubble->drawBubble(&painter);
+    }
+    drawInstructions(&painter);
+    painter.end();
+}
+//! [10]
+
+//! [11]
+void GLWidget::resizeGL(int width, int height)
+{
+    qreal pixelRatio = devicePixelRatio();
+    setupViewport(width*pixelRatio, height*pixelRatio);
+}
+//! [11]
+
+//! [12]
+void GLWidget::showEvent(QShowEvent *event)
+{
+    Q_UNUSED(event);
+    createBubbles(20 - bubbles.count());
+}
+//! [12]
+
+QSize GLWidget::sizeHint() const
+{
+    return QSize(400, 400);
+}
+
+void GLWidget::createBubbles(int number)
+{
+    for (int i = 0; i < number; ++i) {
+        QPointF position(width()*(0.1 + (0.8*qrand()/(RAND_MAX+1.0))),
+                        height()*(0.1 + (0.8*qrand()/(RAND_MAX+1.0))));
+        qreal radius = qMin(width(), height())*(0.0125 + 0.0875*qrand()/(RAND_MAX+1.0));
+        QPointF velocity(width()*0.0125*(-0.5 + qrand()/(RAND_MAX+1.0)),
+                        height()*0.0125*(-0.5 + qrand()/(RAND_MAX+1.0)));
+
+        bubbles.append(new Bubble(position, radius, velocity));
+    }
+}
+
+//! [13]
+void GLWidget::animate()
+{
+    QMutableListIterator<Bubble*> iter(bubbles);
+
+    while (iter.hasNext()) {
+        Bubble *bubble = iter.next();
+        bubble->move(rect());
+    }
+    update();
+}
+//! [13]
+
+//! [14]
+void GLWidget::setupViewport(int width, int height)
+{
+    int side = qMin(width, height);
+    glViewport((width - side) / 2, (height - side) / 2, side, side);
+
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+#ifdef QT_OPENGL_ES
+    glOrthof(-0.5, +0.5, -0.5, 0.5, 4.0, 15.0);
+#else
+    glOrtho(-0.5, +0.5, -0.5, 0.5, 4.0, 15.0);
+#endif
+    glMatrixMode(GL_MODELVIEW);
+}
+//! [14]
+
+//! [15]
+void GLWidget::drawInstructions(QPainter *painter)
+{
+    QString text = tr("Click and drag with the left mouse button "
+                      "to rotate the Qt logo.");
+    QFontMetrics metrics = QFontMetrics(font());
+    int border = qMax(4, metrics.leading());
+
+    QRect rect = metrics.boundingRect(0, 0, width() - 2*border, int(height()*0.125),
+                                      Qt::AlignCenter | Qt::TextWordWrap, text);
+    painter->setRenderHint(QPainter::TextAntialiasing);
+    painter->fillRect(QRect(0, 0, width(), rect.height() + 2*border),
+                     QColor(0, 0, 0, 127));
+    painter->setPen(Qt::white);
+    painter->fillRect(QRect(0, 0, width(), rect.height() + 2*border),
+                      QColor(0, 0, 0, 127));
+    painter->drawText((width() - rect.width())/2, border,
+                      rect.width(), rect.height(),
+                      Qt::AlignCenter | Qt::TextWordWrap, text);
+}
+//! [15]
diff --git a/examples/opengl/legacy/overpainting/glwidget.h b/examples/opengl/legacy/overpainting/glwidget.h
new file mode 100644
index 0000000000..1d1d48458d
--- /dev/null
+++ b/examples/opengl/legacy/overpainting/glwidget.h
@@ -0,0 +1,103 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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 GLWIDGET_H
+#define GLWIDGET_H
+
+#include <QGLWidget>
+#include <QTimer>
+
+class Bubble;
+class QtLogo;
+
+//! [0]
+class GLWidget : public QGLWidget
+{
+    Q_OBJECT
+
+public:
+    GLWidget(QWidget *parent = 0);
+    ~GLWidget();
+//! [0]
+
+    QSize sizeHint() const Q_DECL_OVERRIDE;
+    int xRotation() const { return xRot; }
+    int yRotation() const { return yRot; }
+    int zRotation() const { return zRot; }
+
+public slots:
+    void setXRotation(int angle);
+    void setYRotation(int angle);
+    void setZRotation(int angle);
+
+//! [1]
+protected:
+    void initializeGL() Q_DECL_OVERRIDE;
+    void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
+    void resizeGL(int width, int height) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void mouseMoveEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
+    void showEvent(QShowEvent *event) Q_DECL_OVERRIDE;
+
+private slots:
+    void animate();
+
+private:
+    void createBubbles(int number);
+    void drawInstructions(QPainter *painter);
+//! [1]
+    void setupViewport(int width, int height);
+
+    QColor qtGreen;
+    QColor qtPurple;
+
+    GLuint object;
+    int xRot;
+    int yRot;
+    int zRot;
+    QPoint lastPos;
+//! [4]
+    QtLogo *logo;
+    QList<Bubble*> bubbles;
+    QTimer animationTimer;
+//! [4]
+};
+
+#endif // GLWIDGET_H
diff --git a/examples/opengl/legacy/overpainting/main.cpp b/examples/opengl/legacy/overpainting/main.cpp
new file mode 100644
index 0000000000..57c520b528
--- /dev/null
+++ b/examples/opengl/legacy/overpainting/main.cpp
@@ -0,0 +1,51 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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$
+**
+****************************************************************************/
+
+#include "glwidget.h"
+
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+    GLWidget window;
+    window.show();
+    return app.exec();
+}
diff --git a/examples/opengl/legacy/overpainting/overpainting.pro b/examples/opengl/legacy/overpainting/overpainting.pro
new file mode 100644
index 0000000000..c1bda7853d
--- /dev/null
+++ b/examples/opengl/legacy/overpainting/overpainting.pro
@@ -0,0 +1,23 @@
+QT += opengl widgets
+
+VPATH += ../shared
+INCLUDEPATH += ../shared
+
+HEADERS = bubble.h \
+    glwidget.h \
+    qtlogo.h
+
+SOURCES = bubble.cpp \
+    glwidget.cpp \
+    main.cpp \
+    qtlogo.cpp
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/opengl/overpainting
+INSTALLS += target
+
+contains(QT_CONFIG, opengles.) {
+    contains(QT_CONFIG, angle): \
+        warning("Qt was built with ANGLE, which provides only OpenGL ES 2.0 on top of DirectX 9.0c")
+    error("This example requires Qt to be configured with -opengl desktop")
+}
diff --git a/examples/opengl/legacy/pbuffers/cube.cpp b/examples/opengl/legacy/pbuffers/cube.cpp
new file mode 100644
index 0000000000..dc1bb23fea
--- /dev/null
+++ b/examples/opengl/legacy/pbuffers/cube.cpp
@@ -0,0 +1,328 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "cube.h"
+#include "glwidget.h"
+
+#include <QtGui/QImage>
+#include <QtCore/QPropertyAnimation>
+
+static const qreal speeds[] = { 3.8f, 4.4f, 5.6f };
+static const qreal amplitudes[] = { 2.0f, 2.5f, 3.0f };
+
+static inline void qSetColor(float colorVec[], QColor c)
+{
+    colorVec[0] = c.redF();
+    colorVec[1] = c.greenF();
+    colorVec[2] = c.blueF();
+    colorVec[3] = c.alphaF();
+}
+
+int Geometry::append(const QVector3D &a, const QVector3D &n, const QVector2D &t)
+{
+    int v = vertices.count();
+    vertices.append(a);
+    normals.append(n);
+    texCoords.append(t);
+    faces.append(v);
+    colors.append(QVector4D(0.6f, 0.6f, 0.6f, 1.0f));
+    return v;
+}
+
+void Geometry::addQuad(const QVector3D &a, const QVector3D &b,
+                           const QVector3D &c, const QVector3D &d,
+                           const QVector<QVector2D> &tex)
+{
+    QVector3D norm = QVector3D::normal(a, b, c);
+    // append first triangle
+    int aref = append(a, norm, tex[0]);
+    append(b, norm, tex[1]);
+    int cref = append(c, norm, tex[2]);
+    // append second triangle
+    faces.append(aref);
+    faces.append(cref);
+    append(d, norm, tex[3]);
+}
+
+void Geometry::loadArrays() const
+{
+    glEnableClientState(GL_VERTEX_ARRAY);
+    glEnableClientState(GL_NORMAL_ARRAY);
+    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+    glEnableClientState(GL_COLOR_ARRAY);
+    glVertexPointer(3, GL_FLOAT, 0, vertices.constData());
+    glNormalPointer(GL_FLOAT, 0, normals.constData());
+    glTexCoordPointer(2, GL_FLOAT, 0, texCoords.constData());
+    glColorPointer(4, GL_FLOAT, 0, colors.constData());
+}
+
+void Geometry::setColors(int start, GLfloat colorArray[4][4])
+{
+    int off = faces[start];
+    for (int i = 0; i < 4; ++i)
+        colors[i + off] = QVector4D(colorArray[i][0],
+                                      colorArray[i][1],
+                                      colorArray[i][2],
+                                      colorArray[i][3]);
+}
+
+Tile::Tile(const QVector3D &loc)
+    : location(loc)
+    , start(0)
+    , count(0)
+    , useFlatColor(false)
+    , geom(0)
+{
+    qSetColor(faceColor, QColor(Qt::darkGray));
+}
+
+void Tile::setColors(GLfloat colorArray[4][4])
+{
+    useFlatColor = true;
+    geom->setColors(start, colorArray);
+}
+
+void Tile::draw() const
+{
+    QMatrix4x4 mat;
+    mat.translate(location);
+    mat.rotate(orientation);
+    glMatrixMode(GL_MODELVIEW);
+    glPushMatrix();
+    glMultMatrixf(mat.constData());
+    glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, faceColor);
+    glDrawElements(GL_TRIANGLES, count, GL_UNSIGNED_SHORT, geom->indices() + start);
+    glPopMatrix();
+}
+
+TileBuilder::TileBuilder(Geometry *g, qreal depth, qreal size)
+    : verts(4)
+    , tex(4)
+    , start(g->count())
+    , count(0)
+    , geom(g)
+{
+    // front face - make a square with bottom-left at origin
+    verts[br].setX(size);
+    verts[tr].setX(size);
+    verts[tr].setY(size);
+    verts[tl].setY(size);
+
+    // these vert numbers are good for the tex-coords
+    for (int i = 0; i < 4; ++i)
+        tex[i] = verts[i].toVector2D();
+
+    // now move verts half cube width across so cube is centered on origin
+    for (int i = 0; i < 4; ++i)
+        verts[i] -= QVector3D(size / 2.0f, size / 2.0f, -depth);
+
+    // add the front face
+    g->addQuad(verts[bl], verts[br], verts[tr], verts[tl], tex);
+
+    count = g->count() - start;
+}
+
+void TileBuilder::initialize(Tile *tile) const
+{
+    tile->start = start;
+    tile->count = count;
+    tile->geom = geom;
+    qSetColor(tile->faceColor, color);
+}
+
+Tile *TileBuilder::newTile(const QVector3D &loc) const
+{
+    Tile *tile = new Tile(loc);
+    initialize(tile);
+    return tile;
+}
+
+Cube::Cube(const QVector3D &loc)
+    : Tile(loc)
+    , rot(0.0f)
+    , r(0)
+    , animGroup(0)
+{
+}
+
+Cube::~Cube()
+{
+}
+
+void Cube::setAltitude(qreal a)
+{
+    if (location.y() != a)
+    {
+        location.setY(a);
+        emit changed();
+    }
+}
+
+void Cube::setRange(qreal r)
+{
+    if (location.x() != r)
+    {
+        location.setX(r);
+        emit changed();
+    }
+}
+
+void Cube::setRotation(qreal r)
+{
+    if (r != rot)
+    {
+        orientation = QQuaternion::fromAxisAndAngle(QVector3D(1.0f, 1.0f, 1.0f), r);
+        emit changed();
+    }
+}
+
+void Cube::removeBounce()
+{
+    delete animGroup;
+    animGroup = 0;
+    delete r;
+    r = 0;
+}
+
+void Cube::startAnimation()
+{
+    if (r)
+    {
+        r->start();
+        r->setCurrentTime(startx);
+    }
+    if (animGroup)
+        animGroup->start();
+    if (rtn)
+        rtn->start();
+}
+
+void Cube::setAnimationPaused(bool paused)
+{
+    if (paused)
+    {
+        if (r)
+            r->pause();
+        if (animGroup)
+            animGroup->pause();
+        if (rtn)
+            rtn->pause();
+    }
+    else
+    {
+        if (r)
+            r->resume();
+        if (animGroup)
+            animGroup->resume();
+        if (rtn)
+            rtn->resume();
+    }
+}
+
+CubeBuilder::CubeBuilder(Geometry *g, qreal depth, qreal size)
+    : TileBuilder(g, depth)
+    , ix(0)
+{
+    for (int i = 0; i < 4; ++i)
+        verts[i].setZ(size / 2.0f);
+    // back face - "extrude" verts down
+    QVector<QVector3D> back(verts);
+    for (int i = 0; i < 4; ++i)
+        back[i].setZ(-size / 2.0f);
+
+    // add the back face
+    g->addQuad(back[br], back[bl], back[tl], back[tr], tex);
+
+    // add the sides
+    g->addQuad(back[bl], back[br], verts[br], verts[bl], tex);
+    g->addQuad(back[br], back[tr], verts[tr], verts[br], tex);
+    g->addQuad(back[tr], back[tl], verts[tl], verts[tr], tex);
+    g->addQuad(back[tl], back[bl], verts[bl], verts[tl], tex);
+
+    count = g->count() - start;
+}
+
+Cube *CubeBuilder::newCube(const QVector3D &loc) const
+{
+    Cube *c = new Cube(loc);
+    initialize(c);
+    qreal d = 4000.0f;
+    qreal d3 = d / 3.0f;
+    // Animate movement from left to right
+    c->r = new QPropertyAnimation(c, "range");
+    c->r->setStartValue(-1.3f);
+    c->r->setEndValue(1.3f);
+    c->startx = ix * d3 * 3.0f;
+    c->r->setDuration(d * 4.0f);
+    c->r->setLoopCount(-1);
+    c->r->setEasingCurve(QEasingCurve(QEasingCurve::CosineCurve));
+
+    c->animGroup = new QSequentialAnimationGroup(c);
+
+    // Animate movement from bottom to top
+    QPropertyAnimation *a_up = new QPropertyAnimation(c, "altitude", c->animGroup);
+    a_up->setEndValue(loc.y());
+    a_up->setStartValue(loc.y() + amplitudes[ix]);
+    a_up->setDuration(d / speeds[ix]);
+    a_up->setLoopCount(1);
+    a_up->setEasingCurve(QEasingCurve(QEasingCurve::InQuad));
+
+    // Animate movement from top to bottom
+    QPropertyAnimation *a_down = new QPropertyAnimation(c, "altitude", c->animGroup);
+    a_down->setEndValue(loc.y() + amplitudes[ix]);
+    a_down->setStartValue(loc.y());
+    a_down->setDuration(d / speeds[ix]);
+    a_down->setLoopCount(1);
+    a_down->setEasingCurve(QEasingCurve(QEasingCurve::OutQuad));
+
+    c->animGroup->addAnimation(a_up);
+    c->animGroup->addAnimation(a_down);
+    c->animGroup->setLoopCount(-1);
+
+    // Animate rotation
+    c->rtn = new QPropertyAnimation(c, "rotation");
+    c->rtn->setStartValue(c->rot);
+    c->rtn->setEndValue(359.0f);
+    c->rtn->setDuration(d * 2.0f);
+    c->rtn->setLoopCount(-1);
+    c->rtn->setDuration(d / 2);
+    ix = (ix + 1) % 3;
+    return c;
+}
diff --git a/examples/opengl/legacy/pbuffers/cube.h b/examples/opengl/legacy/pbuffers/cube.h
new file mode 100644
index 0000000000..05017cb376
--- /dev/null
+++ b/examples/opengl/legacy/pbuffers/cube.h
@@ -0,0 +1,149 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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 CUBE_H
+#define CUBE_H
+
+#include <QtOpenGL/qgl.h>
+#include <QtCore/qvector.h>
+#include <QtCore/qsequentialanimationgroup.h>
+#include <QtGui/qmatrix4x4.h>
+#include <QtGui/qvector3d.h>
+#include <QtGui/qvector2d.h>
+
+QT_BEGIN_NAMESPACE
+class QPropertyAnimation;
+QT_END_NAMESPACE
+
+class Geometry
+{
+public:
+    void loadArrays() const;
+    void addQuad(const QVector3D &a, const QVector3D &b,
+                 const QVector3D &c, const QVector3D &d,
+                 const QVector<QVector2D> &tex);
+    void setColors(int start, GLfloat colors[4][4]);
+    const GLushort *indices() const { return faces.constData(); }
+    int count() const { return faces.count(); }
+private:
+    QVector<GLushort> faces;
+    QVector<QVector3D> vertices;
+    QVector<QVector3D> normals;
+    QVector<QVector2D> texCoords;
+    QVector<QVector4D> colors;
+    int append(const QVector3D &a, const QVector3D &n, const QVector2D &t);
+    void addTri(const QVector3D &a, const QVector3D &b, const QVector3D &c, const QVector3D &n);
+    friend class Tile;
+};
+
+class Tile
+{
+public:
+    void draw() const;
+    void setColors(GLfloat[4][4]);
+protected:
+    Tile(const QVector3D &loc = QVector3D());
+    QVector3D location;
+    QQuaternion orientation;
+private:
+    int start;
+    int count;
+    bool useFlatColor;
+    GLfloat faceColor[4];
+    Geometry *geom;
+    friend class TileBuilder;
+};
+
+class TileBuilder
+{
+public:
+    enum { bl, br, tr, tl };
+    explicit TileBuilder(Geometry *, qreal depth = 0.0f, qreal size = 1.0f);
+    Tile *newTile(const QVector3D &loc = QVector3D()) const;
+    void setColor(QColor c) { color = c; }
+protected:
+    void initialize(Tile *) const;
+    QVector<QVector3D> verts;
+    QVector<QVector2D> tex;
+    int start;
+    int count;
+    Geometry *geom;
+    QColor color;
+};
+
+class Cube : public QObject, public Tile
+{
+    Q_OBJECT
+    Q_PROPERTY(qreal range READ range WRITE setRange)
+    Q_PROPERTY(qreal altitude READ altitude WRITE setAltitude)
+    Q_PROPERTY(qreal rotation READ rotation WRITE setRotation)
+public:
+    Cube(const QVector3D &loc = QVector3D());
+    ~Cube();
+    qreal range() { return location.x(); }
+    void setRange(qreal r);
+    qreal altitude() { return location.y(); }
+    void setAltitude(qreal a);
+    qreal rotation() { return rot; }
+    void setRotation(qreal r);
+    void removeBounce();
+    void startAnimation();
+    void setAnimationPaused(bool paused);
+signals:
+    void changed();
+private:
+    qreal rot;
+    QPropertyAnimation *r;
+    QPropertyAnimation *rtn;
+    QSequentialAnimationGroup *animGroup;
+    qreal startx;
+    friend class CubeBuilder;
+};
+
+class CubeBuilder : public TileBuilder
+{
+public:
+    explicit CubeBuilder(Geometry *, qreal depth = 0.0f, qreal size = 1.0f);
+    Cube *newCube(const QVector3D &loc = QVector3D()) const;
+private:
+    mutable int ix;
+};
+
+#endif // CUBE_H
diff --git a/examples/opengl/legacy/pbuffers/cubelogo.png b/examples/opengl/legacy/pbuffers/cubelogo.png
new file mode 100644
index 0000000000..3ae0f9ba3f
--- /dev/null
+++ b/examples/opengl/legacy/pbuffers/cubelogo.png
diff --git a/examples/opengl/legacy/pbuffers/glwidget.cpp b/examples/opengl/legacy/pbuffers/glwidget.cpp
new file mode 100644
index 0000000000..b319951ccd
--- /dev/null
+++ b/examples/opengl/legacy/pbuffers/glwidget.cpp
@@ -0,0 +1,246 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "glwidget.h"
+#include <math.h>
+
+#include "cube.h"
+
+#include <QGLPixelBuffer>
+
+#ifndef GL_MULTISAMPLE
+#define GL_MULTISAMPLE  0x809D
+#endif
+
+static GLfloat colorArray[][4] = {
+    {0.243f, 0.423f, 0.125f, 1.0f},
+    {0.176f, 0.31f, 0.09f, 1.0f},
+    {0.4f, 0.69f, 0.212f, 1.0f},
+    {0.317f, 0.553f, 0.161f, 1.0f}
+};
+
+GLWidget::GLWidget(QWidget *parent)
+    : QGLWidget(QGLFormat(QGL::SampleBuffers), parent)
+    , geom(0)
+    , cube(0)
+{
+    // create the pbuffer
+    QGLFormat pbufferFormat = format();
+    pbufferFormat.setSampleBuffers(false);
+    pbuffer = new QGLPixelBuffer(QSize(512, 512), pbufferFormat, this);
+    setWindowTitle(tr("OpenGL pbuffers"));
+    initializeGeometry();
+}
+
+GLWidget::~GLWidget()
+{
+    pbuffer->releaseFromDynamicTexture();
+    glDeleteTextures(1, &dynamicTexture);
+    delete pbuffer;
+
+    qDeleteAll(cubes);
+    qDeleteAll(tiles);
+    delete cube;
+}
+
+void GLWidget::initializeGL()
+{
+    initCommon();
+    glShadeModel(GL_SMOOTH);
+    glEnable(GL_LIGHTING);
+    glEnable(GL_LIGHT0);
+    static GLfloat lightPosition[4] = { 0.5, 5.0, 7.0, 1.0 };
+    glLightfv(GL_LIGHT0, GL_POSITION, lightPosition);
+    initPbuffer();
+    cube->startAnimation();
+    connect(cube, SIGNAL(changed()), this, SLOT(update()));
+    for (int i = 0; i < 3; ++i)
+    {
+        cubes[i]->startAnimation();
+        connect(cubes[i], SIGNAL(changed()), this, SLOT(update()));
+    }
+}
+
+void GLWidget::paintGL()
+{
+    pbuffer->makeCurrent();
+    drawPbuffer();
+    // On direct render platforms, drawing onto the pbuffer context above
+    // automatically updates the dynamic texture.  For cases where rendering
+    // directly to a texture is not supported, explicitly copy.
+    if (!hasDynamicTextureUpdate)
+        pbuffer->updateDynamicTexture(dynamicTexture);
+    makeCurrent();
+
+    // Use the pbuffer as a texture to render the scene
+    glBindTexture(GL_TEXTURE_2D, dynamicTexture);
+
+    // set up to render the scene
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    glLoadIdentity();
+    glTranslatef(0.0f, 0.0f, -10.0f);
+
+    // draw the background
+    glPushMatrix();
+    glScalef(aspect, 1.0f, 1.0f);
+    for (int i = 0; i < tiles.count(); ++i)
+        tiles[i]->draw();
+    glPopMatrix();
+
+    // draw the bouncing cubes
+    for (int i = 0; i < cubes.count(); ++i)
+        cubes[i]->draw();
+}
+
+void GLWidget::initializeGeometry()
+{
+    geom = new Geometry();
+    CubeBuilder cBuilder(geom, 0.5);
+    cBuilder.setColor(QColor(255, 255, 255, 212));
+    // build the 3 bouncing, spinning cubes
+    for (int i = 3; i > 0; --i)
+        cubes.append(cBuilder.newCube(QVector3D((float)(i-1), -1.5f, 5 - i)));
+
+    // build the spinning cube which goes in the dynamic texture
+    cube = cBuilder.newCube();
+    cube->removeBounce();
+
+    // build the background tiles
+    TileBuilder tBuilder(geom);
+    tBuilder.setColor(QColor(Qt::white));
+    for (int c = -2; c <= +2; ++c)
+        for (int r = -2; r <= +2; ++r)
+            tiles.append(tBuilder.newTile(QVector3D(c, r, 0)));
+
+    // graded backdrop for the pbuffer scene
+    TileBuilder bBuilder(geom, 0.0f, 2.0f);
+    bBuilder.setColor(QColor(102, 176, 54, 210));
+    backdrop = bBuilder.newTile(QVector3D(0.0f, 0.0f, -1.5f));
+    backdrop->setColors(colorArray);
+}
+
+void GLWidget::initCommon()
+{
+    qglClearColor(QColor(Qt::darkGray));
+
+    glEnable(GL_DEPTH_TEST);
+    glEnable(GL_CULL_FACE);
+    glEnable(GL_MULTISAMPLE);
+
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    glEnable(GL_BLEND);
+
+    glEnable(GL_TEXTURE_2D);
+
+    geom->loadArrays();
+}
+
+void GLWidget::perspectiveProjection()
+{
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+#ifdef QT_OPENGL_ES
+    glFrustumf(-aspect, +aspect, -1.0, +1.0, 4.0, 15.0);
+#else
+    glFrustum(-aspect, +aspect, -1.0, +1.0, 4.0, 15.0);
+#endif
+    glMatrixMode(GL_MODELVIEW);
+}
+
+void GLWidget::orthographicProjection()
+{
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+#ifdef QT_OPENGL_ES
+    glOrthof(-1.0, +1.0, -1.0, +1.0, -90.0, +90.0);
+#else
+    glOrtho(-1.0, +1.0, -1.0, +1.0, -90.0, +90.0);
+#endif
+    glMatrixMode(GL_MODELVIEW);
+}
+
+void GLWidget::resizeGL(int width, int height)
+{
+    glViewport(0, 0, width * devicePixelRatio(), height * devicePixelRatio());
+    aspect = (qreal)width / (qreal)(height ? height : 1);
+    perspectiveProjection();
+}
+
+void GLWidget::drawPbuffer()
+{
+    orthographicProjection();
+
+    glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    glDisable(GL_TEXTURE_2D);
+    backdrop->draw();
+    glEnable(GL_TEXTURE_2D);
+
+    glBindTexture(GL_TEXTURE_2D, cubeTexture);
+    glDisable(GL_CULL_FACE);
+    cube->draw();
+    glEnable(GL_CULL_FACE);
+
+    glFlush();
+}
+
+void GLWidget::initPbuffer()
+{
+    pbuffer->makeCurrent();
+
+    cubeTexture = bindTexture(QImage(":res/cubelogo.png"));
+
+    initCommon();
+
+    // generate a texture that has the same size/format as the pbuffer
+    dynamicTexture = pbuffer->generateDynamicTexture();
+
+    // bind the dynamic texture to the pbuffer - this is a no-op under X11
+    hasDynamicTextureUpdate = pbuffer->bindToDynamicTexture(dynamicTexture);
+    makeCurrent();
+}
+
+void GLWidget::setAnimationPaused(bool enable)
+{
+    cube->setAnimationPaused(enable);
+    for (int i = 0; i < 3; ++i)
+        cubes[i]->setAnimationPaused(enable);
+}
diff --git a/examples/opengl/legacy/pbuffers/glwidget.h b/examples/opengl/legacy/pbuffers/glwidget.h
new file mode 100644
index 0000000000..1d23b7772a
--- /dev/null
+++ b/examples/opengl/legacy/pbuffers/glwidget.h
@@ -0,0 +1,89 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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 GLWIDGET_H
+#define GLWIDGET_H
+
+#include <QGLWidget>
+
+class Geometry;
+class Cube;
+class Tile;
+QT_BEGIN_NAMESPACE
+class QGLPixelBuffer;
+QT_END_NAMESPACE
+
+class GLWidget : public QGLWidget
+{
+public:
+    GLWidget(QWidget *parent = 0);
+    ~GLWidget();
+
+protected:
+    void initializeGL() Q_DECL_OVERRIDE;
+    void paintGL() Q_DECL_OVERRIDE;
+    void resizeGL(int width, int height) Q_DECL_OVERRIDE;
+    void mousePressEvent(QMouseEvent *) Q_DECL_OVERRIDE { setAnimationPaused(true); }
+    void mouseReleaseEvent(QMouseEvent *) Q_DECL_OVERRIDE { setAnimationPaused(false); }
+
+private:
+    void initializeGeometry();
+    void initPbuffer();
+    void initCommon();
+    void perspectiveProjection();
+    void orthographicProjection();
+    void drawPbuffer();
+    void setAnimationPaused(bool enable);
+
+    qreal aspect;
+    GLuint dynamicTexture;
+    GLuint cubeTexture;
+    bool hasDynamicTextureUpdate;
+    QGLPixelBuffer *pbuffer;
+    Geometry *geom;
+    Cube *cube;
+    Tile *backdrop;
+    QList<Cube *> cubes;
+    QList<Tile *> tiles;
+
+};
+//! [3]
+
+#endif
diff --git a/examples/opengl/legacy/pbuffers/main.cpp b/examples/opengl/legacy/pbuffers/main.cpp
new file mode 100644
index 0000000000..8be6640e92
--- /dev/null
+++ b/examples/opengl/legacy/pbuffers/main.cpp
@@ -0,0 +1,65 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtWidgets/QApplication>
+#include <QtWidgets/QMessageBox>
+#include <QtOpenGL/QGLPixelBuffer>
+
+#include "glwidget.h"
+
+int main(int argc, char **argv)
+{
+    Q_INIT_RESOURCE(pbuffers);
+
+    QApplication a(argc, argv);
+    GLWidget widget(0);
+    widget.resize(640, 480);
+    widget.makeCurrent();
+
+    if (!QGLFormat::hasOpenGL() || !QGLPixelBuffer::hasOpenGLPbuffers()) {
+        QMessageBox::information(0, "OpenGL pbuffers",
+                                 "This system does not support OpenGL/pbuffers.");
+        return -1;
+    }
+
+    widget.show();
+    return a.exec();
+}
+
diff --git a/examples/opengl/legacy/pbuffers/pbuffers.pro b/examples/opengl/legacy/pbuffers/pbuffers.pro
new file mode 100644
index 0000000000..a349e39f68
--- /dev/null
+++ b/examples/opengl/legacy/pbuffers/pbuffers.pro
@@ -0,0 +1,17 @@
+HEADERS += glwidget.h \
+    cube.h
+SOURCES += glwidget.cpp \
+    main.cpp \
+    cube.cpp
+RESOURCES += pbuffers.qrc
+QT += opengl widgets
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/opengl/pbuffers
+INSTALLS += target
+
+contains(QT_CONFIG, opengles.) {
+    contains(QT_CONFIG, angle): \
+        warning("Qt was built with ANGLE, which provides only OpenGL ES 2.0 on top of DirectX 9.0c")
+    error("This example requires Qt to be configured with -opengl desktop")
+}
diff --git a/examples/opengl/legacy/pbuffers/pbuffers.qrc b/examples/opengl/legacy/pbuffers/pbuffers.qrc
new file mode 100644
index 0000000000..9fc1a56a1a
--- /dev/null
+++ b/examples/opengl/legacy/pbuffers/pbuffers.qrc
@@ -0,0 +1,5 @@
+<!DOCTYPE RCC><RCC version="1.0">
+<qresource prefix="/res">
+   <file>cubelogo.png</file>
+</qresource>
+</RCC>
diff --git a/examples/opengl/legacy/pbuffers2/bubbles.svg b/examples/opengl/legacy/pbuffers2/bubbles.svg
new file mode 100644
index 0000000000..51730124a2
--- /dev/null
+++ b/examples/opengl/legacy/pbuffers2/bubbles.svg
@@ -0,0 +1,215 @@
+<?xml version="1.0" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
+<svg width="20cm" height="15cm" viewBox="0 0 800 600"
+    xmlns="http://www.w3.org/2000/svg"
+    xmlns:xlink="http://www.w3.org/1999/xlink/"
+    baseProfile="tiny" version="1.2">
+  <title>Spheres</title>
+  <desc>Semi-transparent bubbles on a colored background.</desc>
+    <defs>
+      <!-- Create radial gradients for each bubble. -->
+      <radialGradient id="blueBubble" gradientUnits="userSpaceOnUse"
+                      cx="0" cy="0" r="100" fx="-50" fy="-50">
+        <stop offset="0%" stop-color="white" stop-opacity="1" />
+        <stop offset="25%" stop-color="#cdcdff" stop-opacity=".65" />
+        <stop offset="100%" stop-color="#cdaacd" stop-opacity=".75" />
+      </radialGradient>
+      <radialGradient id="redBubble" gradientUnits="userSpaceOnUse"
+                      cx="0" cy="0" r="100" fx="-50" fy="-50">
+        <stop offset="0%" stop-color="white" stop-opacity="1" />
+        <stop offset="25%" stop-color="#ffcdcd" stop-opacity=".65" />
+        <stop offset="100%" stop-color="#bbbb99" stop-opacity=".75" />
+      </radialGradient>
+      <radialGradient id="greenBubble" gradientUnits="userSpaceOnUse"
+                      cx="0" cy="0" r="100" fx="-50" fy="-50">
+        <stop offset="0%" stop-color="white" stop-opacity="1" />
+        <stop offset="25%" stop-color="#cdffcd" stop-opacity=".65" />
+        <stop offset="100%" stop-color="#99aaaa" stop-opacity=".75" />
+      </radialGradient>
+      <radialGradient id="yellowBubble" gradientUnits="userSpaceOnUse"
+                      cx="0" cy="0" r="100" fx="-50" fy="-50">
+        <stop offset="0%" stop-color="white" stop-opacity="1" />
+        <stop offset="25%" stop-color="#ffffcd" stop-opacity=".65" />
+        <stop offset="100%" stop-color="#bbbbaa" stop-opacity=".75" />
+      </radialGradient>
+      <radialGradient id="background" gradientUnits="userSpaceOnUse"
+                      cx="0" cy="0" r="400" fx="250" fy="250">
+        <stop offset="0%" stop-color="#ffffee" />
+        <stop offset="100%" stop-color="#ccccaa" />
+      </radialGradient>
+      <linearGradient id="surface" gradientUnits="userSpaceOnUse"
+                      x1="-100" y1="200" x2="400" y2="200">
+        <stop offset="0%" stop-color="#ffffcc" />
+        <stop offset="100%" stop-color="#bbbb88" />
+      </linearGradient>
+
+      <!-- Create radial gradients for each circle to make them look like
+           spheres. -->
+      <radialGradient id="blueSphere" gradientUnits="userSpaceOnUse"
+                      cx="0" cy="0" r="100" fx="-50" fy="-50">
+        <stop offset="0%" stop-color="white" />
+        <stop offset="75%" stop-color="blue" />
+        <stop offset="100%" stop-color="#222244" />
+      </radialGradient>
+      <radialGradient id="redSphere" gradientUnits="userSpaceOnUse"
+                      cx="0" cy="0" r="100" fx="-50" fy="-50">
+        <stop offset="0%" stop-color="white" />
+        <stop offset="75%" stop-color="red" />
+        <stop offset="100%" stop-color="#442222" />
+      </radialGradient>
+      <radialGradient id="greenSphere" gradientUnits="userSpaceOnUse"
+                      cx="0" cy="0" r="100" fx="-50" fy="-50">
+        <stop offset="0%" stop-color="white" />
+        <stop offset="75%" stop-color="green" />
+        <stop offset="100%" stop-color="#113311" />
+      </radialGradient>
+      <radialGradient id="yellowSphere" gradientUnits="userSpaceOnUse"
+                      cx="0" cy="0" r="100" fx="-50" fy="-50">
+        <stop offset="0%" stop-color="white" />
+        <stop offset="75%" stop-color="yellow" />
+        <stop offset="100%" stop-color="#444422" />
+      </radialGradient>
+      <radialGradient id="shadowGrad" gradientUnits="userSpaceOnUse"
+                      cx="0" cy="0" r="100" fx="-50" fy="50">
+        <stop offset="0%" stop-color="black" stop-opacity="1.0" />
+        <stop offset="100%" stop-color="black" stop-opacity="0.0" />
+      </radialGradient>
+
+      <!-- Define a shadow for each sphere. -->
+      <circle id="shadow" fill="url(#shadowGrad)" cx="0" cy="0" r="100" />
+      <g id="bubble">
+        <circle fill="black" cx="0" cy="0" r="50" />
+        <circle fill="#a6ce39" cx="0" cy="0" r="33" />
+        <path fill="black" d="M 37,50 L 50,37 L 12,-1 L 22,-11 L 10,-24 L -24,10
+                              L -11,22 L -1,12 Z" />
+        <circle cx="0" cy="0" r="100" />
+      </g>
+    </defs>
+  <g>
+    <rect fill="url(#background)" x="0" y="0" width="800" height="600" />
+  </g>
+
+  <g transform="translate(200,700)">
+    <use xlink:href="#bubble" fill="url(#blueBubble)" />
+    <animateTransform attributeName="transform" type="translate" additive="sum"
+        values="0,0; 0,-800" begin="1s" dur="10s" fill="freeze" repeatCount="indefinite" />
+  </g>
+  <g transform="translate(315,700)">
+    <g transform="scale(0.5,0.5)">
+      <use xlink:href="#bubble" fill="url(#redBubble)" />
+    </g>
+    <animateTransform attributeName="transform" type="translate" additive="sum"
+        values="0,0; 0,-800" begin="3s" dur="7s" fill="freeze" repeatCount="indefinite" />
+  </g>
+  <g transform="translate(80,700)">
+    <g transform="scale(0.65,0.65)">
+      <use xlink:href="#bubble" fill="url(#greenBubble)" />
+    </g>
+    <animateTransform attributeName="transform" type="translate" additive="sum"
+        values="0,0; 0,-800" begin="5s" dur="9s" fill="freeze" repeatCount="indefinite" />
+  </g>
+  <g transform="translate(255,700)">
+    <g transform="scale(0.3,0.3)">
+      <use xlink:href="#bubble" fill="url(#yellowBubble)" />
+    </g>
+    <animateTransform attributeName="transform" type="translate" additive="sum"
+        values="0,0; 0,-800" begin="2s" dur="6s" fill="freeze" repeatCount="indefinite" />
+  </g>
+  <g transform="translate(565,700)">
+    <g transform="scale(0.4,0.4)">
+      <use xlink:href="#bubble" fill="url(#blueBubble)" />
+    </g>
+    <animateTransform attributeName="transform" type="translate" additive="sum"
+        values="0,0; 0,-800" begin="4s" dur="8s" fill="freeze" repeatCount="indefinite" />
+  </g>
+  <g transform="translate(715,700)">
+    <g transform="scale(0.6,0.6)">
+      <use xlink:href="#bubble" fill="url(#redBubble)" />
+    </g>
+    <animateTransform attributeName="transform" type="translate" additive="sum"
+        values="0,0; 0,-800" begin="1s" dur="4s" fill="freeze" repeatCount="indefinite" />
+  </g>
+  <g transform="translate(645,700)">
+    <g transform="scale(0.375,0.375)">
+      <use xlink:href="#bubble" fill="url(#greenBubble)" />
+    </g>
+    <animateTransform attributeName="transform" type="translate" additive="sum"
+        values="0,0; 0,-800" begin="0s" dur="11s" fill="freeze" repeatCount="indefinite" />
+  </g>
+  <g transform="translate(555,700)">
+    <g transform="scale(0.9,0.9)">
+      <use xlink:href="#bubble" fill="url(#yellowBubble)" />
+    </g>
+    <animateTransform attributeName="transform" type="translate" additive="sum"
+        values="0,0; 0,-800" begin="3s" dur="7.5s" fill="freeze" repeatCount="indefinite" />
+  </g>
+
+  <g transform="translate(360,700)">
+    <g transform="scale(0.5,0.5)">
+      <use xlink:href="#bubble" fill="url(#blueBubble)" />
+    </g>
+    <animateTransform attributeName="transform" type="translate" additive="sum"
+        values="0,0; 0,-800" begin="3s" dur="6s" fill="freeze" repeatCount="indefinite" />
+  </g>
+  <g transform="translate(215,700)">
+    <g transform="scale(0.45,0.45)">
+      <use xlink:href="#bubble" fill="url(#redBubble)" />
+    </g>
+    <animateTransform attributeName="transform" type="translate" additive="sum"
+        values="0,0; 0,-800" begin="5.5s" dur="7s" fill="freeze" repeatCount="indefinite" />
+  </g>
+  <g transform="translate(420,700)">
+    <g transform="scale(0.75,0.75)">
+      <use xlink:href="#bubble" fill="url(#greenBubble)" />
+    </g>
+    <animateTransform attributeName="transform" type="translate" additive="sum"
+        values="0,0; 0,-800" begin="1s" dur="9s" fill="freeze" repeatCount="indefinite" />
+  </g>
+  <g transform="translate(815,700)">
+    <g transform="scale(0.6,0.6)">
+      <use xlink:href="#bubble" fill="url(#yellowBubble)" />
+    </g>
+    <animateTransform attributeName="transform" type="translate" additive="sum"
+        values="0,0; 0,-800" begin="2s" dur="9.5s" fill="freeze" repeatCount="indefinite" />
+  </g>
+
+  <g transform="translate(225,375)" >
+    <g transform="scale(1.0,0.5)" >
+      <path d="M 0 0 L 350 0 L 450 450 L -100 450 z"
+            fill="url(#surface)" stroke="none" />
+    </g>
+  </g>
+    <g transform="translate(200,0)" >
+    <g transform="translate(200,490) scale(2.0,1.0) rotate(45)" >
+      <rect fill="#a6ce39" x="-69" y="-69" width="138" height="138" />
+      <circle fill="black" cx="0" cy="0" r="50" />
+      <circle fill="#a6ce39" cx="0" cy="0" r="33" />
+      <path fill="black" d="M 37,50 L 50,37 L 12,-1 L 22,-11 L 10,-24 L -24,10
+                            L -11,22 L -1,12 Z" />
+      <animateTransform attributeName="transform"  type="rotate" additive="sum" values="0; 360"
+	         begin="0s" dur="10s" fill="freeze" repeatCount="indefinite" />
+    </g>
+    <g transform="translate(200,375)">
+      <use xlink:href="#shadow" transform="translate(25,55) scale(1.0,0.5)" />
+      <circle fill="url(#blueSphere)" cx="0" cy="0" r="100" />
+    </g>
+    <g transform="translate(315,440)">
+      <g transform="scale(0.5,0.5)">
+        <use xlink:href="#shadow" transform="translate(25,55) scale(1.0,0.5)" />
+        <circle fill="url(#redSphere)" cx="0" cy="0" r="100" />
+      </g>
+    </g>
+    <g transform="translate(80,475)">
+      <g transform="scale(0.65,0.65)">
+        <use xlink:href="#shadow" transform="translate(25,55) scale(1.0,0.5)" />
+        <circle fill="url(#greenSphere)" cx="0" cy="0" r="100" />
+      </g>
+    </g>
+    <g transform="translate(255,525)">
+      <g transform="scale(0.3,0.3)">
+        <use xlink:href="#shadow" transform="translate(25,55) scale(1.0,0.5)" />
+        <circle fill="url(#yellowSphere)" cx="0" cy="0" r="100" />
+      </g>
+    </g>
+  </g>
+</svg>
diff --git a/examples/opengl/legacy/pbuffers2/designer.png b/examples/opengl/legacy/pbuffers2/designer.png
new file mode 100644
index 0000000000..4f32d57496
--- /dev/null
+++ b/examples/opengl/legacy/pbuffers2/designer.png
diff --git a/examples/opengl/legacy/pbuffers2/glwidget.cpp b/examples/opengl/legacy/pbuffers2/glwidget.cpp
new file mode 100644
index 0000000000..de30bb8b21
--- /dev/null
+++ b/examples/opengl/legacy/pbuffers2/glwidget.cpp
@@ -0,0 +1,325 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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$
+**
+****************************************************************************/
+
+#include <QtGui/QImage>
+#include "glwidget.h"
+
+#include <math.h>
+
+#ifndef GL_MULTISAMPLE
+#define GL_MULTISAMPLE  0x809D
+#endif
+
+GLWidget::GLWidget(QWidget *parent)
+    : QGLWidget(QGLFormat(QGL::SampleBuffers), parent)
+{
+    setWindowTitle(tr("OpenGL pbuffers 2"));
+
+    pbuffer = new QGLPixelBuffer(1024, 1024, format(), this);
+
+    rot_x = rot_y = rot_z = 0.0f;
+    scale = 0.1f;
+    anim = new QTimeLine(750, this);
+    anim->setUpdateInterval(20);
+    connect(anim, SIGNAL(valueChanged(qreal)), SLOT(animate(qreal)));
+    connect(anim, SIGNAL(finished()), SLOT(animFinished()));
+
+    svg_renderer = new QSvgRenderer(QLatin1String(":/res/bubbles.svg"), this);
+    connect(svg_renderer, SIGNAL(repaintNeeded()), this, SLOT(draw()));
+
+    logo = QImage(":/res/designer.png");
+    logo = logo.convertToFormat(QImage::Format_ARGB32);
+
+    makeCurrent(); // need a current context to create the display list
+    tile_list = glGenLists(1);
+    glNewList(tile_list, GL_COMPILE);
+    glBegin(GL_QUADS);
+    {
+        glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);
+        glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);
+        glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f,  1.0f);
+        glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f,  1.0f);
+
+        glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
+        glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);
+        glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);
+        glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
+
+        glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);
+        glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f,  1.0f,  1.0f);
+        glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f,  1.0f,  1.0f);
+        glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);
+
+        glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
+        glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
+        glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);
+        glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);
+
+        glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
+        glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);
+        glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f,  1.0f,  1.0f);
+        glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);
+
+        glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
+        glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);
+        glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f,  1.0f,  1.0f);
+        glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);
+}
+    glEnd();
+    glEndList();
+
+    wave = new GLfloat[logo.width()*logo.height()];
+    memset(wave, 0, logo.width()*logo.height());
+    startTimer(30); // wave timer
+
+    pbuffer->makeCurrent();
+    dynamicTexture = pbuffer->generateDynamicTexture();
+
+    // bind the dynamic texture to the pbuffer - this is a no-op under X11
+    hasDynamicTextureUpdate = pbuffer->bindToDynamicTexture(dynamicTexture);
+}
+
+GLWidget::~GLWidget()
+{
+    delete[] wave;
+    glDeleteLists(tile_list, 1);
+    pbuffer->releaseFromDynamicTexture();
+    glDeleteTextures(1, &dynamicTexture);
+    delete pbuffer;
+}
+
+void GLWidget::paintEvent(QPaintEvent *)
+{
+    draw();
+}
+
+void GLWidget::draw()
+{
+    QPainter p(this); // used for text overlay
+
+    // save the GL state set for QPainter
+    p.beginNativePainting();
+    saveGLState();
+
+    // render the 'bubbles.svg' file into our pbuffer
+    QPainter pbuffer_painter(pbuffer);
+    svg_renderer->render(&pbuffer_painter);
+    pbuffer_painter.end();
+    glFlush();
+
+    if (!hasDynamicTextureUpdate)
+        pbuffer->updateDynamicTexture(dynamicTexture);
+
+    makeCurrent();
+    // draw into the GL widget
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    glFrustum(-1, 1, -1, 1, 10, 100);
+    glTranslatef(0.0f, 0.0f, -15.0f);
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+    glViewport(0, 0, width() * devicePixelRatio(), height() * devicePixelRatio());
+
+    glBindTexture(GL_TEXTURE_2D, dynamicTexture);
+    glEnable(GL_TEXTURE_2D);
+    glEnable(GL_MULTISAMPLE);
+    glEnable(GL_CULL_FACE);
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+    // draw background
+    glPushMatrix();
+    glScalef(1.7f, 1.7f, 1.7f);
+    glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
+    glCallList(tile_list);
+    glPopMatrix();
+
+    const int w = logo.width();
+    const int h = logo.height();
+
+    glRotatef(rot_x, 1.0f, 0.0f, 0.0f);
+    glRotatef(rot_y, 0.0f, 1.0f, 0.0f);
+    glRotatef(rot_z, 0.0f, 0.0f, 1.0f);
+    glScalef(scale/w, scale/w, scale/w);
+
+    glDepthFunc(GL_LESS);
+    glEnable(GL_DEPTH_TEST);
+
+    // draw the Qt icon
+    glTranslatef(-w+1, -h+1, 0.0f);
+    for (int y=h-1; y>=0; --y) {
+        uint *p = (uint*) logo.scanLine(y);
+        uint *end = p + w;
+        int  x = 0;
+        while (p < end) {
+            glColor4ub(qRed(*p), qGreen(*p), qBlue(*p), uchar(qAlpha(*p)*.9));
+            glTranslatef(0.0f, 0.0f, wave[y*w+x]);
+            if (qAlpha(*p) > 128)
+                glCallList(tile_list);
+            glTranslatef(0.0f, 0.0f, -wave[y*w+x]);
+            glTranslatef(2.0f, 0.0f, 0.0f);
+            ++x;
+            ++p;
+        }
+        glTranslatef(-w*2.0f, 2.0f, 0.0f);
+    }
+
+    // restore the GL state that QPainter expects
+    restoreGLState();
+    p.endNativePainting();
+
+    // draw the overlayed text using QPainter
+    p.setPen(QColor(197, 197, 197, 157));
+    p.setBrush(QColor(197, 197, 197, 127));
+    p.drawRect(QRect(0, 0, width(), 50));
+    p.setPen(Qt::black);
+    p.setBrush(Qt::NoBrush);
+    const QString str1(tr("A simple OpenGL pbuffer example."));
+    const QString str2(tr("Use the mouse wheel to zoom, press buttons and move mouse to rotate, double-click to flip."));
+    QFontMetrics fm(p.font());
+    p.drawText(width()/2 - fm.width(str1)/2, 20, str1);
+    p.drawText(width()/2 - fm.width(str2)/2, 20 + fm.lineSpacing(), str2);
+}
+
+void GLWidget::mousePressEvent(QMouseEvent *e)
+{
+    anchor = e->pos();
+}
+
+void GLWidget::mouseMoveEvent(QMouseEvent *e)
+{
+    QPoint diff = e->pos() - anchor;
+    if (e->buttons() & Qt::LeftButton) {
+        rot_x += diff.y()/5.0f;
+        rot_y += diff.x()/5.0f;
+    } else if (e->buttons() & Qt::RightButton) {
+        rot_z += diff.x()/5.0f;
+    }
+
+    anchor = e->pos();
+    draw();
+}
+
+void GLWidget::wheelEvent(QWheelEvent *e)
+{
+    e->delta() > 0 ? scale += scale*0.1f : scale -= scale*0.1f;
+    draw();
+}
+
+void GLWidget::mouseDoubleClickEvent(QMouseEvent *)
+{
+    anim->start();
+}
+
+void GLWidget::animate(qreal val)
+{
+    rot_y = val * 180;
+    draw();
+}
+
+void GLWidget::animFinished()
+{
+    if (anim->direction() == QTimeLine::Forward)
+        anim->setDirection(QTimeLine::Backward);
+    else
+        anim->setDirection(QTimeLine::Forward);
+}
+
+void GLWidget::saveGLState()
+{
+    glPushAttrib(GL_ALL_ATTRIB_BITS);
+    glMatrixMode(GL_PROJECTION);
+    glPushMatrix();
+    glMatrixMode(GL_MODELVIEW);
+    glPushMatrix();
+}
+
+void GLWidget::restoreGLState()
+{
+    glMatrixMode(GL_PROJECTION);
+    glPopMatrix();
+    glMatrixMode(GL_MODELVIEW);
+    glPopMatrix();
+    glPopAttrib();
+}
+
+#define PI 3.14159
+
+void GLWidget::timerEvent(QTimerEvent *)
+{
+    if (QApplication::mouseButtons() != 0)
+        return;
+
+    static bool scale_in = true;
+
+    if (scale_in && scale > 35.0f)
+        scale_in = false;
+    else if (!scale_in && scale < .5f)
+        scale_in = true;
+
+    scale = scale_in ? scale + scale*0.01f : scale-scale*0.01f;
+    rot_z += 0.3f;
+    rot_x += 0.1f;
+
+    int dx, dy; // disturbance point
+    float s, v, W, t;
+    int i, j;
+    static float wt[128][128];
+    const int width = logo.width();
+    const int AMP = 5;
+
+    dx = dy = width >> 1;
+
+    W = .3f;
+    v = -4; // wave speed
+
+    for (i = 0; i < width; ++i) {
+        for ( j = 0; j < width; ++j) {
+            s = sqrt((double) ((j - dx) * (j - dx) + (i - dy) * (i - dy)));
+            wt[i][j] += 0.1f;
+            t = s / v;
+            if (s != 0)
+                wave[i*width + j] = AMP * sin(2 * PI * W * (wt[i][j] + t)) / (0.2*(s + 2));
+            else
+                wave[i*width + j] = AMP * sin(2 * PI * W * (wt[i][j] + t));
+        }
+    }
+}
diff --git a/examples/opengl/legacy/pbuffers2/glwidget.h b/examples/opengl/legacy/pbuffers2/glwidget.h
new file mode 100644
index 0000000000..20dd796a48
--- /dev/null
+++ b/examples/opengl/legacy/pbuffers2/glwidget.h
@@ -0,0 +1,84 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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$
+**
+****************************************************************************/
+
+#include <QtOpenGL>
+#include <QImage>
+#include <QTimeLine>
+#include <QSvgRenderer>
+
+class GLWidget : public QGLWidget
+{
+    Q_OBJECT
+
+public:
+    GLWidget(QWidget *parent);
+    ~GLWidget();
+
+    void saveGLState();
+    void restoreGLState();
+
+    void paintEvent(QPaintEvent *);
+    void mousePressEvent(QMouseEvent *);
+    void mouseDoubleClickEvent(QMouseEvent *);
+    void mouseMoveEvent(QMouseEvent *);
+    void timerEvent(QTimerEvent *);
+    void wheelEvent(QWheelEvent *);
+
+public slots:
+    void animate(qreal);
+    void animFinished();
+    void draw();
+
+private:
+    QPoint anchor;
+    float scale;
+    float rot_x, rot_y, rot_z;
+    GLuint tile_list;
+    GLfloat *wave;
+    bool hasDynamicTextureUpdate;
+
+    QImage logo;
+    QTimeLine *anim;
+    QSvgRenderer *svg_renderer;
+
+    GLuint dynamicTexture;
+    QGLPixelBuffer *pbuffer;
+};
+
diff --git a/examples/opengl/legacy/pbuffers2/main.cpp b/examples/opengl/legacy/pbuffers2/main.cpp
new file mode 100644
index 0000000000..79fd88a3c8
--- /dev/null
+++ b/examples/opengl/legacy/pbuffers2/main.cpp
@@ -0,0 +1,61 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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$
+**
+****************************************************************************/
+
+#include <QtWidgets/QApplication>
+#include <QtWidgets/QMessageBox>
+#include "glwidget.h"
+
+int main(int argc, char **argv)
+{
+    Q_INIT_RESOURCE(pbuffers2);
+
+    QApplication a(argc, argv);
+    GLWidget widget(0);
+    widget.resize(640, 480);
+    widget.makeCurrent();
+    if (!QGLFormat::hasOpenGL() || !QGLPixelBuffer::hasOpenGLPbuffers()) {
+        QMessageBox::information(0, "OpenGL pbuffers 2",
+                                 "This system does not support OpenGL/pbuffers.");
+        return -1;
+    }
+    widget.show();
+    return a.exec();
+}
+
diff --git a/examples/opengl/legacy/pbuffers2/pbuffers2.pro b/examples/opengl/legacy/pbuffers2/pbuffers2.pro
new file mode 100644
index 0000000000..f9dd269eea
--- /dev/null
+++ b/examples/opengl/legacy/pbuffers2/pbuffers2.pro
@@ -0,0 +1,15 @@
+QT += opengl svg widgets
+
+HEADERS += glwidget.h
+SOURCES += glwidget.cpp main.cpp
+RESOURCES += pbuffers2.qrc
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/opengl/pbuffers2
+INSTALLS += target
+
+contains(QT_CONFIG, opengles.) {
+    contains(QT_CONFIG, angle): \
+        warning("Qt was built with ANGLE, which provides only OpenGL ES 2.0 on top of DirectX 9.0c")
+    error("This example requires Qt to be configured with -opengl desktop")
+}
diff --git a/examples/opengl/legacy/pbuffers2/pbuffers2.qrc b/examples/opengl/legacy/pbuffers2/pbuffers2.qrc
new file mode 100644
index 0000000000..986f1ca385
--- /dev/null
+++ b/examples/opengl/legacy/pbuffers2/pbuffers2.qrc
@@ -0,0 +1,6 @@
+<!DOCTYPE RCC><RCC version="1.0">
+<qresource prefix="/res">
+   <file>bubbles.svg</file>
+   <file>designer.png</file>
+</qresource>
+</RCC>
diff --git a/examples/opengl/legacy/samplebuffers/glwidget.cpp b/examples/opengl/legacy/samplebuffers/glwidget.cpp
new file mode 100644
index 0000000000..28abf3d6c0
--- /dev/null
+++ b/examples/opengl/legacy/samplebuffers/glwidget.cpp
@@ -0,0 +1,164 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "glwidget.h"
+#include <math.h>
+
+#ifndef GL_MULTISAMPLE
+#define GL_MULTISAMPLE  0x809D
+#endif
+
+GLWidget::GLWidget(QWidget *parent)
+    : QGLWidget(QGLFormat(QGL::SampleBuffers), parent)
+{
+    startTimer(40);
+    setWindowTitle(tr("Sample Buffers"));
+}
+
+void GLWidget::initializeGL()
+{
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    glOrtho(-.5, .5, .5, -.5, -1000, 1000);
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+    glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
+
+    makeObject();
+}
+
+void GLWidget::resizeGL(int w, int h)
+{
+    glViewport(0, 0, w, h);
+}
+
+void GLWidget::paintGL()
+{
+    static float rot = 0.0;
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    glMatrixMode(GL_MODELVIEW);
+    glPushMatrix();
+    glEnable(GL_MULTISAMPLE);
+    glTranslatef(-0.25f, -0.10f, 0.0f);
+    glScalef(0.75f, 1.15f, 0.0f);
+    glRotatef(rot, 0.0f, 0.f, 1.0f);
+    glCallList(list);
+    glPopMatrix();
+
+    glPushMatrix();
+    glDisable(GL_MULTISAMPLE);
+    glTranslatef(0.25f, -0.10f, 0.0f);
+    glScalef(0.75f, 1.15f, 0.0f);
+    glRotatef(rot, 0.0f, 0.0f, 1.0f);
+    glCallList(list);
+    glPopMatrix();
+
+    rot += 0.2f;
+
+    qglColor(Qt::black);
+    renderText(-0.35, 0.4, 0.0, "Multisampling enabled");
+    renderText(0.15, 0.4, 0.0, "Multisampling disabled");
+}
+
+void GLWidget::timerEvent(QTimerEvent *)
+{
+    update();
+}
+
+void GLWidget::makeObject()
+{
+    QColor qtGreen(QColor::fromCmykF(0.40, 0.0, 1.0, 0.0));
+    const double Pi = 3.14159265358979323846;
+    const int NumSectors = 15;
+    GLdouble x1 = +0.06;
+    GLdouble y1 = -0.14;
+    GLdouble x2 = +0.14;
+    GLdouble y2 = -0.06;
+    GLdouble x3 = +0.08;
+    GLdouble y3 = +0.00;
+    GLdouble x4 = +0.30;
+    GLdouble y4 = +0.22;
+
+    list = glGenLists(1);
+    glNewList(list, GL_COMPILE);
+    {
+        for (int i = 0; i < NumSectors; ++i) {
+            double angle1 = (i * 2 * Pi) / NumSectors;
+            GLdouble x5 = 0.30 * sin(angle1);
+            GLdouble y5 = 0.30 * cos(angle1);
+            GLdouble x6 = 0.20 * sin(angle1);
+            GLdouble y6 = 0.20 * cos(angle1);
+
+            double angle2 = ((i + 1) * 2 * Pi) / NumSectors;
+            GLdouble x7 = 0.20 * sin(angle2);
+            GLdouble y7 = 0.20 * cos(angle2);
+            GLdouble x8 = 0.30 * sin(angle2);
+            GLdouble y8 = 0.30 * cos(angle2);
+
+            qglColor(qtGreen);
+            quad(GL_QUADS, x5, y5, x6, y6, x7, y7, x8, y8);
+            qglColor(Qt::black);
+            quad(GL_LINE_LOOP, x5, y5, x6, y6, x7, y7, x8, y8);
+        }
+
+        qglColor(qtGreen);
+        quad(GL_QUADS, x1, y1, x2, y2, y2, x2, y1, x1);
+        quad(GL_QUADS, x3, y3, x4, y4, y4, x4, y3, x3);
+
+        qglColor(Qt::black);
+        quad(GL_LINE_LOOP, x1, y1, x2, y2, y2, x2, y1, x1);
+        quad(GL_LINE_LOOP, x3, y3, x4, y4, y4, x4, y3, x3);
+    }
+    glEndList();
+}
+
+void GLWidget::quad(GLenum primitive, GLdouble x1, GLdouble y1, GLdouble x2, GLdouble y2,
+                    GLdouble x3, GLdouble y3, GLdouble x4, GLdouble y4)
+{
+    glBegin(primitive);
+    {
+        glVertex2d(x1, y1);
+        glVertex2d(x2, y2);
+        glVertex2d(x3, y3);
+        glVertex2d(x4, y4);
+    }
+    glEnd();
+}
diff --git a/examples/opengl/legacy/samplebuffers/glwidget.h b/examples/opengl/legacy/samplebuffers/glwidget.h
new file mode 100644
index 0000000000..494c5861df
--- /dev/null
+++ b/examples/opengl/legacy/samplebuffers/glwidget.h
@@ -0,0 +1,61 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtOpenGL>
+
+class GLWidget : public QGLWidget
+{
+public:
+    GLWidget(QWidget *parent);
+
+protected:
+    void initializeGL() Q_DECL_OVERRIDE;
+    void resizeGL(int w, int h) Q_DECL_OVERRIDE;
+    void paintGL() Q_DECL_OVERRIDE;
+    void timerEvent(QTimerEvent *) Q_DECL_OVERRIDE;
+
+    void makeObject();
+    void quad(GLenum primitive, GLdouble x1, GLdouble y1, GLdouble x2, GLdouble y2,
+              GLdouble x3, GLdouble y3, GLdouble x4, GLdouble y4);
+
+private:
+    GLuint list;
+};
+
diff --git a/examples/opengl/legacy/samplebuffers/main.cpp b/examples/opengl/legacy/samplebuffers/main.cpp
new file mode 100644
index 0000000000..a1272af4db
--- /dev/null
+++ b/examples/opengl/legacy/samplebuffers/main.cpp
@@ -0,0 +1,71 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtWidgets/QApplication>
+#include <QtWidgets/QMessageBox>
+#include "glwidget.h"
+
+int main(int argc, char **argv)
+{
+    QApplication a(argc, argv);
+
+    QGLFormat f = QGLFormat::defaultFormat();
+    f.setSampleBuffers(true);
+    QGLFormat::setDefaultFormat(f);
+    if (!QGLFormat::hasOpenGL()) {
+        QMessageBox::information(0, "OpenGL samplebuffers",
+                                 "This system does not support OpenGL.");
+        return 0;
+    }
+
+    GLWidget widget(0);
+
+    if (!widget.format().sampleBuffers()) {
+        QMessageBox::information(0, "OpenGL samplebuffers",
+                                 "This system does not have sample buffer support.");
+        return 0;
+    }
+
+    widget.resize(640, 480);
+    widget.show();
+
+    return a.exec();
+}
+
diff --git a/examples/opengl/legacy/samplebuffers/samplebuffers.pro b/examples/opengl/legacy/samplebuffers/samplebuffers.pro
new file mode 100644
index 0000000000..b57599aae4
--- /dev/null
+++ b/examples/opengl/legacy/samplebuffers/samplebuffers.pro
@@ -0,0 +1,14 @@
+HEADERS += glwidget.h
+SOURCES += glwidget.cpp main.cpp
+
+QT += opengl widgets
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/opengl/samplebuffers
+INSTALLS += target
+
+contains(QT_CONFIG, opengles.) {
+    contains(QT_CONFIG, angle): \
+        warning("Qt was built with ANGLE, which provides only OpenGL ES 2.0 on top of DirectX 9.0c")
+    error("This example requires Qt to be configured with -opengl desktop")
+}
diff --git a/examples/opengl/legacy/shared/qtlogo.cpp b/examples/opengl/legacy/shared/qtlogo.cpp
new file mode 100644
index 0000000000..608f5b3f2b
--- /dev/null
+++ b/examples/opengl/legacy/shared/qtlogo.cpp
@@ -0,0 +1,387 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qtlogo.h"
+
+#include <QGLWidget>
+#include <QMatrix4x4>
+#include <QVector3D>
+
+#include <qmath.h>
+
+static const qreal tee_height = 0.311126;
+static const qreal cross_width = 0.25;
+static const qreal bar_thickness = 0.113137;
+static const qreal logo_depth = 0.10;
+
+//! [0]
+struct Geometry
+{
+    QVector<GLushort> faces;
+    QVector<QVector3D> vertices;
+    QVector<QVector3D> normals;
+    void appendSmooth(const QVector3D &a, const QVector3D &n, int from);
+    void appendFaceted(const QVector3D &a, const QVector3D &n);
+    void finalize();
+    void loadArrays() const;
+};
+//! [0]
+
+//! [1]
+class Patch
+{
+public:
+    enum Smoothing { Faceted, Smooth };
+    Patch(Geometry *);
+    void setSmoothing(Smoothing s) { sm = s; }
+    void translate(const QVector3D &t);
+    void rotate(qreal deg, QVector3D axis);
+    void draw() const;
+    void addTri(const QVector3D &a, const QVector3D &b, const QVector3D &c, const QVector3D &n);
+    void addQuad(const QVector3D &a, const QVector3D &b,  const QVector3D &c, const QVector3D &d);
+
+    GLushort start;
+    GLushort count;
+    GLushort initv;
+
+    GLfloat faceColor[4];
+    QMatrix4x4 mat;
+    Smoothing sm;
+    Geometry *geom;
+};
+//! [1]
+
+static inline void qSetColor(float colorVec[], QColor c)
+{
+    colorVec[0] = c.redF();
+    colorVec[1] = c.greenF();
+    colorVec[2] = c.blueF();
+    colorVec[3] = c.alphaF();
+}
+
+void Geometry::loadArrays() const
+{
+    glVertexPointer(3, GL_FLOAT, 0, vertices.constData());
+    glNormalPointer(GL_FLOAT, 0, normals.constData());
+}
+
+void Geometry::finalize()
+{
+    // TODO: add vertex buffer uploading here
+
+    // Finish smoothing normals by ensuring accumulated normals are returned
+    // to length 1.0.
+    for (int i = 0; i < normals.count(); ++i)
+        normals[i].normalize();
+}
+
+void Geometry::appendSmooth(const QVector3D &a, const QVector3D &n, int from)
+{
+    // Smooth normals are achieved by averaging the normals for faces meeting
+    // at a point.  First find the point in geometry already generated
+    // (working backwards, since most often the points shared are between faces
+    // recently added).
+    int v = vertices.count() - 1;
+    for ( ; v >= from; --v)
+        if (qFuzzyCompare(vertices[v], a))
+            break;
+
+    if (v < from) {
+        // The vertex was not found so add it as a new one, and initialize
+        // its corresponding normal
+        v = vertices.count();
+        vertices.append(a);
+        normals.append(n);
+    } else {
+        // Vert found, accumulate normals into corresponding normal slot.
+        // Must call finalize once finished accumulating normals
+        normals[v] += n;
+    }
+
+    // In both cases (found or not) reference the vertex via its index
+    faces.append(v);
+}
+
+void Geometry::appendFaceted(const QVector3D &a, const QVector3D &n)
+{
+    // Faceted normals are achieved by duplicating the vertex for every
+    // normal, so that faces meeting at a vertex get a sharp edge.
+    int v = vertices.count();
+    vertices.append(a);
+    normals.append(n);
+    faces.append(v);
+}
+
+Patch::Patch(Geometry *g)
+   : start(g->faces.count())
+   , count(0)
+   , initv(g->vertices.count())
+   , sm(Patch::Smooth)
+   , geom(g)
+{
+    qSetColor(faceColor, QColor(Qt::darkGray));
+}
+
+void Patch::rotate(qreal deg, QVector3D axis)
+{
+    mat.rotate(deg, axis);
+}
+
+void Patch::translate(const QVector3D &t)
+{
+    mat.translate(t);
+}
+
+//! [2]
+void Patch::draw() const
+{
+    glPushMatrix();
+    glMultMatrixf(mat.constData());
+    glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, faceColor);
+
+    const GLushort *indices = geom->faces.constData();
+    glDrawElements(GL_TRIANGLES, count, GL_UNSIGNED_SHORT, indices + start);
+    glPopMatrix();
+}
+//! [2]
+
+void Patch::addTri(const QVector3D &a, const QVector3D &b, const QVector3D &c, const QVector3D &n)
+{
+    QVector3D norm = n.isNull() ? QVector3D::normal(a, b, c) : n;
+
+    if (sm == Smooth) {
+        geom->appendSmooth(a, norm, initv);
+        geom->appendSmooth(b, norm, initv);
+        geom->appendSmooth(c, norm, initv);
+    } else {
+        geom->appendFaceted(a, norm);
+        geom->appendFaceted(b, norm);
+        geom->appendFaceted(c, norm);
+    }
+
+    count += 3;
+}
+
+void Patch::addQuad(const QVector3D &a, const QVector3D &b,  const QVector3D &c, const QVector3D &d)
+{
+    QVector3D norm = QVector3D::normal(a, b, c);
+
+    if (sm == Smooth) {
+        addTri(a, b, c, norm);
+        addTri(a, c, d, norm);
+    } else {
+        // If faceted share the two common vertices
+        addTri(a, b, c, norm);
+        int k = geom->vertices.count();
+        geom->appendSmooth(a, norm, k);
+        geom->appendSmooth(c, norm, k);
+        geom->appendFaceted(d, norm);
+        count += 3;
+    }
+}
+
+static inline QVector<QVector3D> extrude(const QVector<QVector3D> &vertices, qreal depth)
+{
+    QVector<QVector3D> extr = vertices;
+    for (int v = 0; v < extr.count(); ++v)
+        extr[v].setZ(extr[v].z() - depth);
+    return extr;
+}
+
+class Rectoid
+{
+public:
+    void translate(const QVector3D &t)
+    {
+        for (int i = 0; i < parts.count(); ++i)
+            parts[i]->translate(t);
+    }
+
+    void rotate(qreal deg, QVector3D axis)
+    {
+        for (int i = 0; i < parts.count(); ++i)
+            parts[i]->rotate(deg, axis);
+    }
+
+    // No special Rectoid destructor - the parts are fetched out of this member
+    // variable, and destroyed by the new owner
+    QList<Patch *> parts;
+};
+
+class RectPrism : public Rectoid
+{
+public:
+    RectPrism(Geometry *g, qreal width, qreal height, qreal depth);
+};
+
+RectPrism::RectPrism(Geometry *g, qreal width, qreal height, qreal depth)
+{
+    enum { bl, br, tr, tl };
+    Patch *fb = new Patch(g);
+    fb->setSmoothing(Patch::Faceted);
+
+    // front face
+    QVector<QVector3D> r(4);
+    r[br].setX(width);
+    r[tr].setX(width);
+    r[tr].setY(height);
+    r[tl].setY(height);
+    QVector3D adjToCenter(-width / 2.0, -height / 2.0, depth / 2.0);
+    for (int i = 0; i < 4; ++i)
+        r[i] += adjToCenter;
+    fb->addQuad(r[bl], r[br], r[tr], r[tl]);
+
+    // back face
+    QVector<QVector3D> s = extrude(r, depth);
+    fb->addQuad(s[tl], s[tr], s[br], s[bl]);
+
+    // side faces
+    Patch *sides = new Patch(g);
+    sides->setSmoothing(Patch::Faceted);
+    sides->addQuad(s[bl], s[br], r[br], r[bl]);
+    sides->addQuad(s[br], s[tr], r[tr], r[br]);
+    sides->addQuad(s[tr], s[tl], r[tl], r[tr]);
+    sides->addQuad(s[tl], s[bl], r[bl], r[tl]);
+
+    parts << fb << sides;
+}
+
+class RectTorus : public Rectoid
+{
+public:
+    RectTorus(Geometry *g, qreal iRad, qreal oRad, qreal depth, int numSectors);
+};
+
+RectTorus::RectTorus(Geometry *g, qreal iRad, qreal oRad, qreal depth, int k)
+{
+    QVector<QVector3D> inside;
+    QVector<QVector3D> outside;
+    for (int i = 0; i < k; ++i) {
+        qreal angle = (i * 2 * M_PI) / k;
+        inside << QVector3D(iRad * qSin(angle), iRad * qCos(angle), depth / 2.0);
+        outside << QVector3D(oRad * qSin(angle), oRad * qCos(angle), depth / 2.0);
+    }
+    inside << QVector3D(0.0, iRad, 0.0);
+    outside << QVector3D(0.0, oRad, 0.0);
+    QVector<QVector3D> in_back = extrude(inside, depth);
+    QVector<QVector3D> out_back = extrude(outside, depth);
+
+    // Create front, back and sides as separate patches so that smooth normals
+    // are generated for the curving sides, but a faceted edge is created between
+    // sides and front/back
+    Patch *front = new Patch(g);
+    for (int i = 0; i < k; ++i)
+        front->addQuad(outside[i], inside[i],
+                       inside[(i + 1) % k], outside[(i + 1) % k]);
+    Patch *back = new Patch(g);
+    for (int i = 0; i < k; ++i)
+        back->addQuad(in_back[i], out_back[i],
+                      out_back[(i + 1) % k], in_back[(i + 1) % k]);
+    Patch *is = new Patch(g);
+    for (int i = 0; i < k; ++i)
+        is->addQuad(in_back[i], in_back[(i + 1) % k],
+                    inside[(i + 1) % k], inside[i]);
+    Patch *os = new Patch(g);
+    for (int i = 0; i < k; ++i)
+        os->addQuad(out_back[(i + 1) % k], out_back[i],
+                    outside[i], outside[(i + 1) % k]);
+    parts << front << back << is << os;
+}
+
+QtLogo::QtLogo(QObject *parent, int divisions, qreal scale)
+    : QObject(parent)
+    , geom(new Geometry())
+{
+    buildGeometry(divisions, scale);
+}
+
+QtLogo::~QtLogo()
+{
+    qDeleteAll(parts);
+    delete geom;
+}
+
+void QtLogo::setColor(QColor c)
+{
+    for (int i = 0; i < parts.count(); ++i)
+        qSetColor(parts[i]->faceColor, c);
+}
+
+//! [3]
+void QtLogo::buildGeometry(int divisions, qreal scale)
+{
+    qreal cw = cross_width * scale;
+    qreal bt = bar_thickness * scale;
+    qreal ld = logo_depth * scale;
+    qreal th = tee_height *scale;
+
+    RectPrism cross(geom, cw, bt, ld);
+    RectPrism stem(geom, bt, th, ld);
+
+    QVector3D z(0.0, 0.0, 1.0);
+    cross.rotate(45.0, z);
+    stem.rotate(45.0, z);
+
+    qreal stem_downshift = (th + bt) / 2.0;
+    stem.translate(QVector3D(0.0, -stem_downshift, 0.0));
+
+    RectTorus body(geom, 0.20, 0.30, 0.1, divisions);
+
+    parts << stem.parts << cross.parts << body.parts;
+
+    geom->finalize();
+}
+//! [3]
+
+//! [4]
+void QtLogo::draw() const
+{
+    geom->loadArrays();
+
+    glEnableClientState(GL_VERTEX_ARRAY);
+    glEnableClientState(GL_NORMAL_ARRAY);
+
+    for (int i = 0; i < parts.count(); ++i)
+        parts[i]->draw();
+
+    glDisableClientState(GL_VERTEX_ARRAY);
+    glDisableClientState(GL_NORMAL_ARRAY);
+}
+//! [4]
diff --git a/examples/opengl/legacy/shared/qtlogo.h b/examples/opengl/legacy/shared/qtlogo.h
new file mode 100644
index 0000000000..5508372b01
--- /dev/null
+++ b/examples/opengl/legacy/shared/qtlogo.h
@@ -0,0 +1,66 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 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 QTLOGO_H
+#define QTLOGO_H
+
+#include <QObject>
+#include <QColor>
+
+class Patch;
+struct Geometry;
+
+//! [0]
+class QtLogo : public QObject
+{
+public:
+    explicit QtLogo(QObject *parent, int d = 64, qreal s = 1.0);
+    ~QtLogo();
+    void setColor(QColor c);
+    void draw() const;
+private:
+    void buildGeometry(int d, qreal s);
+
+    QList<Patch *> parts;
+    Geometry *geom;
+};
+//! [0]
+
+#endif // QTLOGO_H
author	Laszlo Agocs <laszlo.agocs@digia.com>	2014-08-02 19:42:15 +0200
committer	Laszlo Agocs <laszlo.agocs@digia.com>	2014-08-12 07:47:23 +0200
commit	611558d877a9ee4448b30e5443e3025c6235daaf (patch)
tree	2a5d5a6da4a9994ccef4a49dec235f661a1e57f1 /examples/opengl/legacy
parent	338f9c4f7c42d2a7bcd2c5b37137b3cc7cd9775d (diff)