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<?xml-stylesheet type="text/xsl" href="mathml.xsl"?><html xmlns="http://www.w3.org/1999/xhtml" xmlns:pref="http://www.w3.org/2002/Math/preference" pref:renderer="mathplayer-dl"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><link rel="stylesheet" type="text/css" href="opengl-man.css" /><title>glGetFragDataLocation - OpenGL 4 Reference Pages</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /></head><body><div class="refentry"><a id="glGetFragDataLocation"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glGetFragDataLocation — query the bindings of color numbers to user-defined varying out variables</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">GLint <strong class="fsfunc">glGetFragDataLocation</strong>(</code></td><td>GLuint <var class="pdparam">program</var>, </td></tr><tr><td> </td><td>const char * <var class="pdparam">name</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>program</code></em></span></dt><dd><p>
The name of the program containing varying out variable whose binding to query
</p></dd><dt><span class="term"><em class="parameter"><code>name</code></em></span></dt><dd><p>
The name of the user-defined varying out variable whose binding to query
</p></dd></dl></div></div><div class="refsect1"><a id="description"></a><h2>Description</h2><p>
<code class="function">glGetFragDataLocation</code> retrieves the assigned color number binding for the user-defined
varying out variable <em class="parameter"><code>name</code></em> for program <em class="parameter"><code>program</code></em>. <em class="parameter"><code>program</code></em>
must have previously been linked. <em class="parameter"><code>name</code></em> must be a null-terminated string. If <em class="parameter"><code>name</code></em>
is not the name of an active user-defined varying out fragment shader variable within <em class="parameter"><code>program</code></em>, -1 will
be returned.
</p></div><div class="refsect1"><a id="errors"></a><h2>Errors</h2><p>
<code class="constant">GL_INVALID_OPERATION</code> is generated if <em class="parameter"><code>program</code></em> is not the name of a program object.
</p></div><div class="refsect1"><a id="seealso"></a><h2>See Also</h2><p>
<a class="citerefentry" href="glCreateProgram.xml"><span class="citerefentry"><span class="refentrytitle">glCreateProgram</span></span></a>,
<a class="citerefentry" href="glBindFragDataLocation.xml"><span class="citerefentry"><span class="refentrytitle">glBindFragDataLocation</span></span></a>
</p></div><div class="refsect1"><a id="Copyright"></a><h2>Copyright</h2><p>
Copyright <span class="trademark"></span>© 2010-2013 Khronos Group.
This material may be distributed subject to the terms and conditions set forth in
the Open Publication License, v 1.0, 8 June 1999.
<a class="ulink" href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>.
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