| 1 | /****************************************************************************
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| 2 | **
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| 3 | ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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| 4 | ** Contact: Qt Software Information ([email protected])
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| 5 | **
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| 6 | ** This file is part of the QtOpenGL module of the Qt Toolkit.
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| 7 | **
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| 8 | ** $QT_BEGIN_LICENSE:LGPL$
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| 9 | ** Commercial Usage
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| 10 | ** Licensees holding valid Qt Commercial licenses may use this file in
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| 11 | ** accordance with the Qt Commercial License Agreement provided with the
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| 12 | ** Software or, alternatively, in accordance with the terms contained in
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| 13 | ** a written agreement between you and Nokia.
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| 14 | **
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| 15 | ** GNU Lesser General Public License Usage
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| 16 | ** Alternatively, this file may be used under the terms of the GNU Lesser
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| 17 | ** General Public License version 2.1 as published by the Free Software
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| 18 | ** Foundation and appearing in the file LICENSE.LGPL included in the
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| 22 | **
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| 23 | ** In addition, as a special exception, Nokia gives you certain
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| 24 | ** additional rights. These rights are described in the Nokia Qt LGPL
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| 25 | ** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
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| 26 | ** package.
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| 27 | **
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| 28 | ** GNU General Public License Usage
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| 29 | ** Alternatively, this file may be used under the terms of the GNU
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| 30 | ** General Public License version 3.0 as published by the Free Software
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| 31 | ** Foundation and appearing in the file LICENSE.GPL included in the
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| 33 | ** ensure the GNU General Public License version 3.0 requirements will be
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| 36 | ** If you are unsure which license is appropriate for your use, please
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| 37 | ** contact the sales department at [email protected].
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| 38 | ** $QT_END_LICENSE$
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| 39 | **
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| 40 | ****************************************************************************/
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| 41 |
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| 42 | /*!
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| 43 | \class QGLPixelBuffer
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| 44 | \brief The QGLPixelBuffer class encapsulates an OpenGL pbuffer.
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| 45 | \since 4.1
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| 46 |
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| 47 | \ingroup multimedia
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| 48 |
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| 49 | Rendering into a pbuffer is normally done using full hardware
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| 50 | acceleration. This can be significantly faster than rendering
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| 51 | into a QPixmap.
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| 52 |
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| 53 | There are three approaches to using this class:
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| 54 |
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| 55 | \list 1
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| 56 | \o \bold{We can draw into the pbuffer and convert it to a QImage
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| 57 | using toImage().} This is normally much faster than calling
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| 58 | QGLWidget::renderPixmap().
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| 59 |
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| 60 | \o \bold{We can draw into the pbuffer and copy the contents into
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| 61 | an OpenGL texture using updateDynamicTexture().} This allows
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| 62 | us to create dynamic textures and works on all systems
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| 63 | with pbuffer support.
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| 64 |
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| 65 | \o \bold{On systems that support it, we can bind the pbuffer to
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