<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en_US" lang="en_US">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<!-- qgl.cpp -->
<title>Qt 4.8: QGL Namespace</title>
<link rel="stylesheet" type="text/css" href="style/style.css" />
<script src="scripts/jquery.js" type="text/javascript"></script>
<script src="scripts/functions.js" type="text/javascript"></script>
<link rel="stylesheet" type="text/css" href="style/superfish.css" />
<link rel="stylesheet" type="text/css" href="style/narrow.css" />
<!--[if IE]>
<meta name="MSSmartTagsPreventParsing" content="true">
<meta http-equiv="imagetoolbar" content="no">
<![endif]-->
<!--[if lt IE 7]>
<link rel="stylesheet" type="text/css" href="style/style_ie6.css">
<![endif]-->
<!--[if IE 7]>
<link rel="stylesheet" type="text/css" href="style/style_ie7.css">
<![endif]-->
<!--[if IE 8]>
<link rel="stylesheet" type="text/css" href="style/style_ie8.css">
<![endif]-->
<script src="scripts/superfish.js" type="text/javascript"></script>
<script src="scripts/narrow.js" type="text/javascript"></script>
</head>
<body class="" onload="CheckEmptyAndLoadList();">
<div class="header" id="qtdocheader">
<div class="content">
<div id="nav-logo">
<a href="index.html">Home</a></div>
<a href="index.html" class="qtref"><span>Qt Reference Documentation</span></a>
<div id="narrowsearch"></div>
<div id="nav-topright">
<ul>
<li class="nav-topright-home"><a href="http://qt.digia.com/">Qt HOME</a></li>
<li class="nav-topright-dev"><a href="http://qt-project.org/">DEV</a></li>
<li class="nav-topright-doc nav-topright-doc-active"><a href="http://qt-project.org/doc/">
DOC</a></li>
<li class="nav-topright-blog"><a href="http://blog.qt.digia.com/">BLOG</a></li>
</ul>
</div>
<div id="shortCut">
<ul>
<li class="shortCut-topleft-inactive"><span><a href="index.html">Qt 4.8</a></span></li>
<li class="shortCut-topleft-active"><a href="http://qt-project.org/doc/">ALL VERSIONS </a></li>
</ul>
</div>
<ul class="sf-menu" id="narrowmenu">
<li><a href="#">API Lookup</a>
<ul>
<li><a href="classes.html">Class index</a></li>
<li><a href="functions.html">Function index</a></li>
<li><a href="modules.html">Modules</a></li>
<li><a href="namespaces.html">Namespaces</a></li>
<li><a href="qtglobal.html">Global Declarations</a></li>
<li><a href="qdeclarativeelements.html">QML elements</a></li>
</ul>
</li>
<li><a href="#">Qt Topics</a>
<ul>
<li><a href="qt-basic-concepts.html">Programming with Qt</a></li>
<li><a href="qtquick.html">Device UIs & Qt Quick</a></li>
<li><a href="qt-gui-concepts.html">UI Design with Qt</a></li>
<li><a href="supported-platforms.html">Supported Platforms</a></li>
<li><a href="technology-apis.html">Qt and Key Technologies</a></li>
<li><a href="best-practices.html">How-To's and Best Practices</a></li>
</ul>
</li>
<li><a href="#">Examples</a>
<ul>
<li><a href="all-examples.html">Examples</a></li>
<li><a href="tutorials.html">Tutorials</a></li>
<li><a href="demos.html">Demos</a></li>
<li><a href="qdeclarativeexamples.html">QML Examples</a></li>
</ul>
</li>
</ul>
</div>
</div>
<div class="wrapper">
<div class="hd">
<span></span>
</div>
<div class="bd group">
<div class="sidebar">
<div class="searchlabel">
Search index:</div>
<div class="search" id="sidebarsearch">
<form id="qtdocsearch" action="" onsubmit="return false;">
<fieldset>
<input type="text" name="searchstring" id="pageType" value="" />
<div id="resultdialog">
<a href="#" id="resultclose">Close</a>
<p id="resultlinks" class="all"><a href="#" id="showallresults">All</a> | <a href="#" id="showapiresults">API</a> | <a href="#" id="showarticleresults">Articles</a> | <a href="#" id="showexampleresults">Examples</a></p>
<p id="searchcount" class="all"><span id="resultcount"></span><span id="apicount"></span><span id="articlecount"></span><span id="examplecount"></span> results:</p>
<ul id="resultlist" class="all">
</ul>
</div>
</fieldset>
</form>
</div>
<div class="box first bottombar" id="lookup">
<h2 title="API Lookup"><span></span>
API Lookup</h2>
<div id="list001" class="list">
<ul id="ul001" >
<li class="defaultLink"><a href="classes.html">Class index</a></li>
<li class="defaultLink"><a href="functions.html">Function index</a></li>
<li class="defaultLink"><a href="modules.html">Modules</a></li>
<li class="defaultLink"><a href="namespaces.html">Namespaces</a></li>
<li class="defaultLink"><a href="qtglobal.html">Global Declarations</a></li>
<li class="defaultLink"><a href="qdeclarativeelements.html">QML elements</a></li>
</ul>
</div>
</div>
<div class="box bottombar" id="topics">
<h2 title="Qt Topics"><span></span>
Qt Topics</h2>
<div id="list002" class="list">
<ul id="ul002" >
<li class="defaultLink"><a href="qt-basic-concepts.html">Programming with Qt</a></li>
<li class="defaultLink"><a href="qtquick.html">Device UIs & Qt Quick</a></li>
<li class="defaultLink"><a href="qt-gui-concepts.html">UI Design with Qt</a></li>
<li class="defaultLink"><a href="supported-platforms.html">Supported Platforms</a></li>
<li class="defaultLink"><a href="technology-apis.html">Qt and Key Technologies</a></li>
<li class="defaultLink"><a href="best-practices.html">How-To's and Best Practices</a></li>
</ul>
</div>
</div>
<div class="box" id="examples">
<h2 title="Examples"><span></span>
Examples</h2>
<div id="list003" class="list">
<ul id="ul003">
<li class="defaultLink"><a href="all-examples.html">Examples</a></li>
<li class="defaultLink"><a href="tutorials.html">Tutorials</a></li>
<li class="defaultLink"><a href="demos.html">Demos</a></li>
<li class="defaultLink"><a href="qdeclarativeexamples.html">QML Examples</a></li>
</ul>
</div>
</div>
</div>
<div class="wrap">
<div class="toolbar">
<div class="breadcrumb toolblock">
<ul>
<li class="first"><a href="index.html">Home</a></li>
<!-- Breadcrumbs go here -->
<li><a href="namespaces.html">Namespaces</a></li>
<li>QGL Namespace</li>
</ul>
</div>
<div class="toolbuttons toolblock">
<ul>
<li id="smallA" class="t_button">A</li>
<li id="medA" class="t_button active">A</li>
<li id="bigA" class="t_button">A</li>
<li id="print" class="t_button"><a href="javascript:this.print();">
<span>Print</span></a></li>
</ul>
</div>
</div>
<div class="content mainContent">
<div class="toc">
<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#types">Types</a></li>
<li class="level1"><a href="#functions">Functions</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
</ul>
</div>
<h1 class="title">QGL Namespace</h1>
<!-- $$$QGL-brief -->
<p>The QGL namespace specifies miscellaneous identifiers used in the Qt OpenGL module. <a href="#details">More...</a></p>
<!-- @@@QGL -->
<pre class="cpp"> <span class="preprocessor">#include <QGL></span></pre><ul>
</ul>
<a name="types"></a>
<h2>Types</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> enum </td><td class="memItemRight bottomAlign"><b><a href="qgl.html#FormatOption-enum">FormatOption</a></b> { DoubleBuffer, DepthBuffer, Rgba, AlphaChannel, ..., NoDeprecatedFunctions }</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> flags </td><td class="memItemRight bottomAlign"><b><a href="qgl.html#FormatOption-enum">FormatOptions</a></b></td></tr>
</table>
<a name="functions"></a>
<h2>Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgl.html#setPreferredPaintEngine">setPreferredPaintEngine</a></b> ( QPaintEngine::Type <i>engineType</i> )</td></tr>
</table>
<a name="details"></a>
<!-- $$$QGL-description -->
<div class="descr">
<h2>Detailed Description</h2>
<p>The QGL namespace specifies miscellaneous identifiers used in the Qt OpenGL module.</p>
</div>
<!-- @@@QGL -->
<div class="types">
<h2>Type Documentation</h2>
<!-- $$$FormatOption$$$DoubleBuffer$$$DepthBuffer$$$Rgba$$$AlphaChannel$$$AccumBuffer$$$StencilBuffer$$$StereoBuffers$$$DirectRendering$$$HasOverlay$$$SampleBuffers$$$DeprecatedFunctions$$$SingleBuffer$$$NoDepthBuffer$$$ColorIndex$$$NoAlphaChannel$$$NoAccumBuffer$$$NoStencilBuffer$$$NoStereoBuffers$$$IndirectRendering$$$NoOverlay$$$NoSampleBuffers$$$NoDeprecatedFunctions -->
<h3 class="flags"><a name="FormatOption-enum"></a>enum QGL::<span class="name">FormatOption</span><br/>flags QGL::<span class="name">FormatOptions</span></h3>
<p>This enum specifies the format options that can be used to configure an OpenGL context. These are set using <a href="qglformat.html#setOption">QGLFormat::setOption</a>().</p>
<table class="valuelist"><tr valign="top" class="odd"><th class="tblConst">Constant</th><th class="tblval">Value</th><th class="tbldscr">Description</th></tr>
<tr><td class="topAlign"><tt>QGL::DoubleBuffer</tt></td><td class="topAlign"><tt>0x0001</tt></td><td class="topAlign">Specifies the use of double buffering.</td></tr>
<tr><td class="topAlign"><tt>QGL::DepthBuffer</tt></td><td class="topAlign"><tt>0x0002</tt></td><td class="topAlign">Enables the use of a depth buffer.</td></tr>
<tr><td class="topAlign"><tt>QGL::Rgba</tt></td><td class="topAlign"><tt>0x0004</tt></td><td class="topAlign">Specifies that the context should use RGBA as its pixel format.</td></tr>
<tr><td class="topAlign"><tt>QGL::AlphaChannel</tt></td><td class="topAlign"><tt>0x0008</tt></td><td class="topAlign">Enables the use of an alpha channel.</td></tr>
<tr><td class="topAlign"><tt>QGL::AccumBuffer</tt></td><td class="topAlign"><tt>0x0010</tt></td><td class="topAlign">Enables the use of an accumulation buffer.</td></tr>
<tr><td class="topAlign"><tt>QGL::StencilBuffer</tt></td><td class="topAlign"><tt>0x0020</tt></td><td class="topAlign">Enables the use of a stencil buffer.</td></tr>
<tr><td class="topAlign"><tt>QGL::StereoBuffers</tt></td><td class="topAlign"><tt>0x0040</tt></td><td class="topAlign">Enables the use of a stereo buffers for use with visualization hardware.</td></tr>
<tr><td class="topAlign"><tt>QGL::DirectRendering</tt></td><td class="topAlign"><tt>0x0080</tt></td><td class="topAlign">Specifies that the context is used for direct rendering to a display.</td></tr>
<tr><td class="topAlign"><tt>QGL::HasOverlay</tt></td><td class="topAlign"><tt>0x0100</tt></td><td class="topAlign">Enables the use of an overlay.</td></tr>
<tr><td class="topAlign"><tt>QGL::SampleBuffers</tt></td><td class="topAlign"><tt>0x0200</tt></td><td class="topAlign">Enables the use of sample buffers.</td></tr>
<tr><td class="topAlign"><tt>QGL::DeprecatedFunctions</tt></td><td class="topAlign"><tt>0x0400</tt></td><td class="topAlign">Enables the use of deprecated functionality for OpenGL 3.x contexts. A context with deprecated functionality enabled is called a full context in the OpenGL specification.</td></tr>
<tr><td class="topAlign"><tt>QGL::SingleBuffer</tt></td><td class="topAlign"><tt>DoubleBuffer<<16</tt></td><td class="topAlign">Specifies the use of a single buffer, as opposed to double buffers.</td></tr>
<tr><td class="topAlign"><tt>QGL::NoDepthBuffer</tt></td><td class="topAlign"><tt>DepthBuffer<<16</tt></td><td class="topAlign">Disables the use of a depth buffer.</td></tr>
<tr><td class="topAlign"><tt>QGL::ColorIndex</tt></td><td class="topAlign"><tt>Rgba<<16</tt></td><td class="topAlign">Specifies that the context should use a color index as its pixel format.</td></tr>
<tr><td class="topAlign"><tt>QGL::NoAlphaChannel</tt></td><td class="topAlign"><tt>AlphaChannel<<16</tt></td><td class="topAlign">Disables the use of an alpha channel.</td></tr>
<tr><td class="topAlign"><tt>QGL::NoAccumBuffer</tt></td><td class="topAlign"><tt>AccumBuffer<<16</tt></td><td class="topAlign">Disables the use of an accumulation buffer.</td></tr>
<tr><td class="topAlign"><tt>QGL::NoStencilBuffer</tt></td><td class="topAlign"><tt>StencilBuffer<<16</tt></td><td class="topAlign">Disables the use of a stencil buffer.</td></tr>
<tr><td class="topAlign"><tt>QGL::NoStereoBuffers</tt></td><td class="topAlign"><tt>StereoBuffers<<16</tt></td><td class="topAlign">Disables the use of stereo buffers.</td></tr>
<tr><td class="topAlign"><tt>QGL::IndirectRendering</tt></td><td class="topAlign"><tt>DirectRendering<<16</tt></td><td class="topAlign">Specifies that the context is used for indirect rendering to a buffer.</td></tr>
<tr><td class="topAlign"><tt>QGL::NoOverlay</tt></td><td class="topAlign"><tt>HasOverlay<<16</tt></td><td class="topAlign">Disables the use of an overlay.</td></tr>
<tr><td class="topAlign"><tt>QGL::NoSampleBuffers</tt></td><td class="topAlign"><tt>SampleBuffers<<16</tt></td><td class="topAlign">Disables the use of sample buffers.</td></tr>
<tr><td class="topAlign"><tt>QGL::NoDeprecatedFunctions</tt></td><td class="topAlign"><tt>DeprecatedFunctions<<16</tt></td><td class="topAlign">Disables the use of deprecated functionality for OpenGL 3.x contexts. A context with deprecated functionality disabled is called a forward compatible context in the OpenGL specification.</td></tr>
</table>
<p>The FormatOptions type is a typedef for <a href="qflags.html">QFlags</a><FormatOption>. It stores an OR combination of FormatOption values.</p>
<p><b>See also </b><a href="opengl-samplebuffers.html">Sample Buffers Example</a>.</p>
<!-- @@@FormatOption -->
</div>
<div class="func">
<h2>Function Documentation</h2>
<!-- $$$setPreferredPaintEngine[overload1]$$$setPreferredPaintEngineQPaintEngine::Type -->
<h3 class="fn"><a name="setPreferredPaintEngine"></a><span class="type">void</span> QGL::<span class="name">setPreferredPaintEngine</span> ( <span class="type"><a href="qpaintengine.html#Type-enum">QPaintEngine::Type</a></span> <i>engineType</i> )</h3>
<p>Sets the preferred OpenGL paint engine that is used to draw onto <a href="qglwidget.html">QGLWidget</a>, <a href="qglpixelbuffer.html">QGLPixelBuffer</a> and <a href="qglframebufferobject.html">QGLFramebufferObject</a> targets with <a href="qpainter.html">QPainter</a> in Qt.</p>
<p>The <i>engineType</i> parameter specifies which of the GL engines to use. Only <tt>QPaintEngine::OpenGL</tt> and <tt>QPaintEngine::OpenGL2</tt> are valid parameters to this function. All other values are ignored.</p>
<p>By default, the <tt>QPaintEngine::OpenGL2</tt> engine is used if GL/GLES version 2.0 is available, otherwise <tt>QPaintEngine::OpenGL</tt> is used.</p>
<p><b>Warning:</b> This function must be called before the <a href="qapplication.html">QApplication</a> constructor is called.</p>
<p>This function was introduced in Qt 4.6.</p>
<!-- @@@setPreferredPaintEngine -->
</div>
</div>
</div>
</div>
<div class="ft">
<span></span>
</div>
</div>
<div class="footer">
<p>
<acronym title="Copyright">©</acronym> 2015 The Qt Company Ltd.
Documentation contributions included herein are the copyrights of
their respective owners.</p>
<br />
<p>
The documentation provided herein is licensed under the terms of the
<a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation
License version 1.3</a> as published by the Free Software Foundation.</p>
<p>
Documentation sources may be obtained from <a href="http://www.qt-project.org">
www.qt-project.org</a>.</p>
<br />
<p>
Qt and respective logos are trademarks of The Qt Company Ltd
in Finland and/or other countries worldwide. All other trademarks are property
of their respective owners. <a title="Privacy Policy"
href="http://en.gitorious.org/privacy_policy/">Privacy Policy</a></p>
</div>
<script src="scripts/functions.js" type="text/javascript"></script>
</body>
</html>
