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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>glGetUniformSubroutine - OpenGL 4 Reference Pages</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /></head><body><div class="refentry"><a id="glGetUniformSubroutine"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glGetUniformSubroutine — retrieve the value of a subroutine uniform of a given shader stage of the current program</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">glGetUniformSubroutineuiv</strong>(</code></td><td>GLenum <var class="pdparam">shadertype</var>, </td></tr><tr><td> </td><td>GLint <var class="pdparam">location</var>, </td></tr><tr><td> </td><td>GLuint *<var class="pdparam">values</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>shadertype</code></em></span></dt><dd><p>
Specifies the shader stage from which to query for subroutine uniform index.
<em class="parameter"><code>shadertype</code></em>
must be one of <code class="constant">GL_VERTEX_SHADER</code>, <code class="constant">GL_TESS_CONTROL_SHADER</code>,
<code class="constant">GL_TESS_EVALUATION_SHADER</code>, <code class="constant">GL_GEOMETRY_SHADER</code> or
<code class="constant">GL_FRAGMENT_SHADER</code>.
</p></dd><dt><span class="term"><em class="parameter"><code>location</code></em></span></dt><dd><p>
Specifies the location of the subroutine uniform.
</p></dd><dt><span class="term"><em class="parameter"><code>values</code></em></span></dt><dd><p>
Specifies the address of a variable to receive the value or values of the subroutine uniform.
</p></dd></dl></div></div><div class="refsect1"><a id="description"></a><h2>Description</h2><p>
<code class="function">glGetUniformSubroutine</code> retrieves the value of the subroutine uniform at location
<em class="parameter"><code>location</code></em> for shader stage <em class="parameter"><code>shadertype</code></em> of the current
program. <em class="parameter"><code>location</code></em> must be less than the value of
<code class="constant">GL_ACTIVE_SUBROUTINE_UNIFORM_LOCATIONS</code> for the shader currently in use at
shader stage <em class="parameter"><code>shadertype</code></em>. The value of the subroutine uniform is returned in
<em class="parameter"><code>values</code></em>.
</p></div><div class="refsect1"><a id="errors"></a><h2>Errors</h2><p>
<code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>shadertype</code></em> is not one of the accepted values.
</p><p>
<code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>location</code></em> is greater than or equal to
the value of <code class="constant">GL_ACTIVE_SUBROUTINE_UNIFORM_LOCATIONS</code> for the shader currently in use at
shader stage <em class="parameter"><code>shadertype</code></em>.
</p><p>
<code class="constant">GL_INVALID_OPERATION</code> is generated if no program is active.
</p></div><div class="refsect1"><a id="seealso"></a><h2>See Also</h2><p>
<a class="citerefentry" href="glGetProgram.xml"><span class="citerefentry"><span class="refentrytitle">glGetProgram</span></span></a>,
<a class="citerefentry" href="glGetActiveSubroutineUniform.xml"><span class="citerefentry"><span class="refentrytitle">glGetActiveSubroutineUniform</span></span></a>,
<a class="citerefentry" href="glGetActiveSubroutineUniformName.xml"><span class="citerefentry"><span class="refentrytitle">glGetActiveSubroutineUniformName</span></span></a>,
<a class="citerefentry" href="glGetUniformLocation.xml"><span class="citerefentry"><span class="refentrytitle">glGetUniformLocation</span></span></a>
</p></div><div class="refsect1"><a id="Copyright"></a><h2>Copyright</h2><p>
Copyright <span class="trademark"></span>© 2010 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>.
</p></div></div></body></html>
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