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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
<refentry id="glGetUniformSubroutine">
<refentryinfo>
<copyright>
<year>2010-2013</year>
<holder>Khronos Group.</holder>
</copyright>
</refentryinfo>
<refmeta>
<refentrytitle>glGetUniformSubroutine</refentrytitle>
<manvolnum>3G</manvolnum>
</refmeta>
<refnamediv>
<refname>glGetUniformSubroutine</refname>
<refpurpose>retrieve the value of a subroutine uniform of a given shader stage of the current program</refpurpose>
</refnamediv>
<refsynopsisdiv><title>C Specification</title>
<funcsynopsis>
<funcprototype>
<funcdef>void <function>glGetUniformSubroutineuiv</function></funcdef>
<paramdef>GLenum <parameter>shadertype</parameter></paramdef>
<paramdef>GLint <parameter>location</parameter></paramdef>
<paramdef>GLuint *<parameter>values</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="parameters"><title>Parameters</title>
<variablelist>
<varlistentry>
<term><parameter>shadertype</parameter></term>
<listitem>
<para>
Specifies the shader stage from which to query for subroutine uniform index.
<parameter>shadertype</parameter>
must be one of <constant>GL_VERTEX_SHADER</constant>, <constant>GL_TESS_CONTROL_SHADER</constant>,
<constant>GL_TESS_EVALUATION_SHADER</constant>, <constant>GL_GEOMETRY_SHADER</constant> or
<constant>GL_FRAGMENT_SHADER</constant>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>location</parameter></term>
<listitem>
<para>
Specifies the location of the subroutine uniform.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>values</parameter></term>
<listitem>
<para>
Specifies the address of a variable to receive the value or values of the subroutine uniform.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id="description"><title>Description</title>
<para>
<function>glGetUniformSubroutine</function> retrieves the value of the subroutine uniform at location
<parameter>location</parameter> for shader stage <parameter>shadertype</parameter> of the current
program. <parameter>location</parameter> must be less than the value of
<constant>GL_ACTIVE_SUBROUTINE_UNIFORM_LOCATIONS</constant> for the shader currently in use at
shader stage <parameter>shadertype</parameter>. The value of the subroutine uniform is returned in
<parameter>values</parameter>.
</para>
</refsect1>
<refsect1 id="errors"><title>Errors</title>
<para>
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>shadertype</parameter> is not one of the accepted values.
</para>
<para>
<constant>GL_INVALID_VALUE</constant> is generated if <parameter>location</parameter> is greater than or equal to
the value of <constant>GL_ACTIVE_SUBROUTINE_UNIFORM_LOCATIONS</constant> for the shader currently in use at
shader stage <parameter>shadertype</parameter>.
</para>
<para>
<constant>GL_INVALID_OPERATION</constant> is generated if no program is active.
</para>
</refsect1>
<refsect1 id="seealso"><title>See Also</title>
<para>
<citerefentry><refentrytitle>glGetProgram</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glGetActiveSubroutineUniform</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glGetActiveSubroutineUniformName</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glGetUniformLocation</refentrytitle></citerefentry>
</para>
</refsect1>
<refsect1 id="Copyright"><title>Copyright</title>
<para>
Copyright <trademark class="copyright"></trademark> 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.
<ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>.
</para>
</refsect1>
</refentry>
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