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<title>glGetActiveSubroutineName - OpenGL 4 Reference Pages</title>
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<div class="refentry" id="glGetActiveSubroutineName">
<div class="titlepage"/>
<div class="refnamediv">
<h2>Name</h2>
<p>glGetActiveSubroutineName — query the name of an active shader subroutine</p>
</div>
<div class="refsynopsisdiv">
<h2>C Specification</h2>
<div class="funcsynopsis">
<table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">
<tr>
<td>
<code class="funcdef">void <strong class="fsfunc">glGetActiveSubroutineName</strong>(</code>
</td>
<td>GLuint <var class="pdparam">program</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLenum <var class="pdparam">shadertype</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLuint <var class="pdparam">index</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLsizei <var class="pdparam">bufsize</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLsizei *<var class="pdparam">length</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLchar *<var class="pdparam">name</var><code>)</code>;</td>
</tr>
</table>
<div class="funcprototype-spacer"> </div>
</div>
</div>
<div class="refsect1" id="parameters">
<h2>Parameters</h2>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
<em class="parameter">
<code>program</code>
</em>
</span>
</dt>
<dd>
<p>
Specifies the name of the program containing the subroutine.
</p>
</dd>
<dt>
<span class="term">
<em class="parameter">
<code>shadertype</code>
</em>
</span>
</dt>
<dd>
<p>
Specifies the shader stage from which to query the subroutine name.
</p>
</dd>
<dt>
<span class="term">
<em class="parameter">
<code>index</code>
</em>
</span>
</dt>
<dd>
<p>
Specifies the index of the shader subroutine uniform.
</p>
</dd>
<dt>
<span class="term">
<em class="parameter">
<code>bufsize</code>
</em>
</span>
</dt>
<dd>
<p>
Specifies the size of the buffer whose address is given in <em class="parameter"><code>name</code></em>.
</p>
</dd>
<dt>
<span class="term">
<em class="parameter">
<code>length</code>
</em>
</span>
</dt>
<dd>
<p>
Specifies the address of a variable which is to receive the length of the shader subroutine uniform name.
</p>
</dd>
<dt>
<span class="term">
<em class="parameter">
<code>name</code>
</em>
</span>
</dt>
<dd>
<p>
Specifies the address of an array into which the name of the shader subroutine uniform will be written.
</p>
</dd>
</dl>
</div>
</div>
<div class="refsect1" id="description">
<h2>Description</h2>
<p>
<code class="function">glGetActiveSubroutineName</code> queries the name of an active shader subroutine uniform from the
program object given in <em class="parameter"><code>program</code></em>. <em class="parameter"><code>index</code></em> specifies the index of
the shader subroutine uniform within the shader stage given by <em class="parameter"><code>stage</code></em>, and must between
zero and the value of <code class="constant">GL_ACTIVE_SUBROUTINES</code> minus one for the shader stage.
</p>
<p>
The name of the selected subroutine is returned as a null-terminated string in <em class="parameter"><code>name</code></em>. The
actual number of characters written into <em class="parameter"><code>name</code></em>, not including the null-terminator, is
is returned in <em class="parameter"><code>length</code></em>. If <em class="parameter"><code>length</code></em> is <code class="constant">NULL</code>,
no length is returned. The maximum number of characters that may be written into <em class="parameter"><code>name</code></em>,
including the null-terminator, is given in <em class="parameter"><code>bufsize</code></em>.
</p>
</div>
<div class="refsect1" id="errors">
<h2>Errors</h2>
<p>
<code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>index</code></em> is greater than or equal to
the value of <code class="constant">GL_ACTIVE_SUBROUTINES</code>.
</p>
<p>
<code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>program</code></em> is not the name of an
existing program object.
</p>
</div>
<div class="refsect1" id="associatedgets">
<h2>Associated Gets</h2>
<p>
<a class="citerefentry" href="glGetProgramStage.xhtml"><span class="citerefentry"><span class="refentrytitle">glGetProgramStage</span></span></a> with argument <code class="constant">GL_ACTIVE_SUBROUTINE_UNIFORM_MAX_LENGTH</code>
</p>
</div>
<div class="refsect1" id="versions">
<h2>Version Support</h2>
<div class="informaltable">
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<col style="text-align: center; " class="lastvers"/>
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<thead>
<tr>
<th style="text-align: left; border-right: 2px solid ; ">
</th>
<th style="text-align: center; border-bottom: 2px solid ; " colspan="12">
<span class="bold"><strong>OpenGL Version</strong></span>
</th>
</tr>
<tr>
<th style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>Function / Feature Name</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>2.0</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>2.1</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>3.0</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>3.1</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>3.2</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>3.3</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.0</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.1</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.2</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.3</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.4</strong></span>
</th>
<th style="text-align: center; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.5</strong></span>
</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: left; border-right: 2px solid ; ">
<code class="function">glGetActiveSubroutineName</code>
</td>
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<td style="text-align: center; border-right: 2px solid ; ">-</td>
<td style="text-align: center; border-right: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; ">✔</td>
<td style="text-align: center; ">✔</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="refsect1" id="seealso">
<h2>See Also</h2>
<p>
<a class="citerefentry" href="glGetSubroutineIndex.xhtml"><span class="citerefentry"><span class="refentrytitle">glGetSubroutineIndex</span></span></a>,
<a class="citerefentry" href="glGetActiveSubroutineUniform.xhtml"><span class="citerefentry"><span class="refentrytitle">glGetActiveSubroutineUniform</span></span></a>,
<a class="citerefentry" href="glGetProgramStage.xhtml"><span class="citerefentry"><span class="refentrytitle">glGetProgramStage</span></span></a>
</p>
</div>
<div class="refsect1" id="Copyright">
<h2>Copyright</h2>
<p>
Copyright <span class="trademark"/>© 2010-2014 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="link" href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>.
</p>
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