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-/****************************************************************************
-**
-** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
-** Contact: http://www.qt-project.org/
-**
-** This file is part of the documentation of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:FDL$
-** GNU Free Documentation License
-** Alternatively, this file may be used under the terms of the GNU Free
-** Documentation License version 1.3 as published by the Free Software
-** Foundation and appearing in the file included in the packaging of
-** this file.
-**
-** Other Usage
-** Alternatively, this file may be used in accordance with the terms
-** and conditions contained in a signed written agreement between you
-** and Nokia.
-**
-**
-**
-**
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-/*!
-    \example opengl/hellogl_es
-    \title Hello GL ES Example
-
-    The Hello GL ES example is the \l{Hello GL Example} ported to OpenGL ES.
-    It also included some effects from the OpenGL \l{Overpainting Example}.
-
-    \image hellogl-es-example.png
-
-    A complete introduction to OpenGL ES and a description of all differences
-    between OpenGL and OpenGL ES is out of the scope of this document; but
-    we will describe some of the major issues and differences.
-
-    Since Hello GL ES is a direct port of standard OpenGL code, it is a fairly
-    good example for porting OpenGL code to OpenGL ES.
-
-    \tableofcontents
-
-    \section1 Using QGLWidget
-
-    QGLWidget can be used for OpenGL ES similar to the way it is used with
-    standard OpenGL; but there are some differences. We use EGL 1.0 to embedd
-    the OpenGL ES window within the native window manager. In
-    QGLWidget::initializeGL() we initialize OpenGL ES.
-
-    \section1 Porting OpenGL to OpenGL ES
-
-    Since OpenGL ES is missing the immediate mode and does not support quads,
-    we have to create triangle arrays.
-
-    We create a quad by adding vertices to a QList of vertices. We create both
-    sides of the quad and hardcode a distance of 0.05f. We also compute the
-    correct normal for each face and store them in another QList.
-
-    \snippet examples/opengl/hellogl_es/glwidget.cpp 0
-
-    And then we convert the complete list of vertexes and the list of normals
-    into the native OpenGL ES format that we can use with the OpenGL ES API.
-
-    \snippet examples/opengl/hellogl_es/glwidget.cpp 1
-
-    In \c paintQtLogo() we draw the triangle array using OpenGL ES. We use
-    q_vertexTypeEnum to abstract the fact that our vertex and normal arrays
-    are either in float or in fixed point format.
-
-    \snippet examples/opengl/hellogl_es/glwidget.cpp 2
-
-    \section1 Using QGLPainter
-
-    Since the \c QGLPainter is slower for OpenGL ES we paint the bubbles with
-    the rasterizer and cache them in a QImage. This happends only once during
-    the initialiazation.
-
-    \snippet examples/opengl/hellogl_es/bubble.cpp 0
-
-    For each bubble this QImage is then drawn to the QGLWidget by using the
-    according QPainter with transparency enabled.
-
-    \snippet examples/opengl/hellogl_es/bubble.cpp 1
-
-    Another difference beetwen OpenGL and OpenGL ES is that OpenGL ES does not
-    support glPushAttrib(GL_ALL_ATTRIB_BITS). So we have to restore all the
-    OpenGL states ourselves, after we created the QPainter in
-    GLWidget::paintGL().
-
-    \snippet examples/opengl/hellogl_es/glwidget.cpp 3
-
-    Setting up up the model view matrix and setting the right OpenGL states is
-    done in the same way as for standard OpenGL.
-
-    \snippet examples/opengl/hellogl_es/glwidget.cpp 4
-
-    Now we have to restore the OpenGL state for the QPainter. This is not done
-    automatically for OpenGL ES.
-
-    \snippet examples/opengl/hellogl_es/glwidget.cpp 5
-
-    Now we use the QPainter to draw the transparent bubbles.
-
-    \snippet examples/opengl/hellogl_es/glwidget.cpp 6
-
-    In the end, we calculate the framerate and display it using the QPainter
-    again.
-
-    \snippet examples/opengl/hellogl_es/glwidget.cpp 7
-
-    After we finished all the drawing operations we swap the screen buffer.
-
-    \snippet examples/opengl/hellogl_es/glwidget.cpp 8
-
-    \section1 Summary
-
-    Similar to the \l{Hello GL Example}, we subclass QGLWidget to render
-    a 3D scene using OpenGL ES calls. QGLWidget is a subclass of QWidget.
-    Hence, its \l{QGLWidget}'s subclasses can be placed in layouts and
-    provided with interactive features just like normal custom widgets.
-
-    QGLWidget allows pure OpenGL ES rendering to be mixed with QPainter calls,
-    but care must be taken to maintain the state of the OpenGL ES
-    implementation.
-*/