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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
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** No Commercial Usage
** This file contains pre-release code and may not be distributed.
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** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
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** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
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**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
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** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\page windowsce-opengl.html
\title Windows CE OpenGL ES
\ingroup qtce
\brief Information about support for OpenGL ES with Qt for Windows CE.
\section1 Introduction
\l {http://www.opengl.org}{OpenGL} is an industry standard API for 2D/3D
graphics. It provides a powerful, low-level interface between software
and acceleration hardware, and it is operating system and window system
independent.
\l {http://www.khronos.org/opengles}{OpenGL ES} is a subset of the
\l {http://www.opengl.org}{OpenGL} standard. It is meant for use in
embedded systems. Hence, it has a smaller, more constrained API.
Qt for Windows CE uses EGL 1.1 to embed OpenGL ES windows within the
Windows CE window manager.
To use OpenGL ES enabled widgets in a Qt for Windows CE application, you
only need to subclass QGLWidget and draw on instances of the subclass with
OpenGL ES functions.
OpenGL ES includes profiles for floating-point and fixed-point arithmetic.
The floating point profile is called OpenGL ES CM (Common) and the
fixed-point profile is called OpenGL ES CL (Common Lite).
You can run \c{configure} with the \c{-opengl-es-cm} option for the Common
profile or \c{-opengl-es-cl} for the Common Lite profile. In both cases,
ensure that the \c{lib} and \c{includes} paths include the OpenGL ES
headers and libararies from your SDK. The OpenGL ES lib should be called
either \c{libGLES_CM.lib} for the Common profile or \c{libGLES_CL.lib}
for the Common Lite profile.
To configure Qt for Windows Mobile 5.0 and OpenGL ES Common Lite support
you can run \c{configure} like this:
\snippet doc/src/snippets/code/doc_src_wince-opengl.qdoc 0
The distinction between the Common and Common Lite profiles is important,
because the Common Lite profile has less functionality and only supports a
fixed-point vertex format.
To start programming with Qt and OpenGL ES on Windows CE, you can start
with the \l{Hello GL ES Example}. This example shows how to use QGLWidget
and QGLPainter with OpenGL ES. It also provides some hints on how to port
OpenGL code to OpenGL ES.
\section2 Using OpenGL to Accelerate Normal 2D Painting
Qt provides QOpenGLPaintEngine, a subclass of QPaintEngine that translates
QPainter operations into OpenGL calls. This is especially convenient for
drawing text or QImage objects in an OpenGL ES context. For further
details, refer to the \l{Hello GL ES Example}.
*/
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