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<a href="index.html" class="qtref"><span>Qt Reference Documentation</span></a>
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<li><a href="namespaces.html">Namespaces</a></li>
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<h3><a name="toc">Contents</a></h3>
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<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>
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<h1 class="title">QGL Namespace</h1>
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<p>The QGL namespace specifies miscellaneous identifiers used in the Qt OpenGL module. <a href="#details">More...</a></p>
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<pre class="cpp"> <span class="preprocessor">#include <QGL></span></pre><ul>
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<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>
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<h2>Functions</h2>
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<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>
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<h2>Detailed Description</h2>
<p>The QGL namespace specifies miscellaneous identifiers used in the Qt OpenGL module.</p>
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<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>
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</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>
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