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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>glGetActiveSubroutineName - OpenGL 4 Reference Pages</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /></head><body><div class="refentry"><a id="glGetActiveSubroutineName"></a><div class="titlepage"></div><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 border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><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"><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>
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"><a id="description"></a><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"><a id="errors"></a><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"><a id="associatedgets"></a><h2>Associated Gets</h2><p>
<a class="citerefentry" href="glGetProgramStage.xml"><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"><a id="seealso"></a><h2>See Also</h2><p>
<a class="citerefentry" href="glGetSubroutineIndex.xml"><span class="citerefentry"><span class="refentrytitle">glGetSubroutineIndex</span></span></a>,
<a class="citerefentry" href="glGetActiveSubroutineUniform.xml"><span class="citerefentry"><span class="refentrytitle">glGetActiveSubroutineUniform</span></span></a>,
<a class="citerefentry" href="glGetProgramStage.xml"><span class="citerefentry"><span class="refentrytitle">glGetProgramStage</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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