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<!DOCTYPE refentry [ <!ENTITY % mathent SYSTEM "math.ent"> %mathent; ]>
<!-- Converted by db4-upgrade version 1.1 -->
<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="glGetSubroutineIndex">
<info>
<copyright>
<year>2010-2014</year>
<holder>Khronos Group.</holder>
</copyright>
</info>
<refmeta>
<refentrytitle>glGetSubroutineIndex</refentrytitle>
<manvolnum>3G</manvolnum>
</refmeta>
<refnamediv>
<refname>glGetSubroutineIndex</refname>
<refpurpose>retrieve the index of a subroutine uniform of a given shader stage within a program</refpurpose>
</refnamediv>
<refsynopsisdiv><title>C Specification</title>
<funcsynopsis>
<funcprototype>
<funcdef>GLuint <function>glGetSubroutineIndex</function></funcdef>
<paramdef>GLuint <parameter>program</parameter></paramdef>
<paramdef>GLenum <parameter>shadertype</parameter></paramdef>
<paramdef>const GLchar *<parameter>name</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 xml:id="parameters"><title>Parameters</title>
<variablelist>
<varlistentry>
<term><parameter>program</parameter></term>
<listitem>
<para>
Specifies the name of the program containing shader stage.
</para>
</listitem>
</varlistentry>
<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>name</parameter></term>
<listitem>
<para>
Specifies the name of the subroutine uniform whose index to query.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 xml:id="description"><title>Description</title>
<para>
<function>glGetSubroutineIndex</function> returns the index of a subroutine uniform within a shader stage attached to a program object.
<parameter>program</parameter> contains the name of the program to which the shader is attached. <parameter>shadertype</parameter>
specifies the stage from which to query shader subroutine index. <parameter>name</parameter> contains the null-terminated
name of the subroutine uniform whose name to query.
</para>
<para>
If <parameter>name</parameter> is not the name of a subroutine uniform in the shader stage, <constant>GL_INVALID_INDEX</constant>
is returned, but no error is generated. If <parameter>name</parameter> is the name of a subroutine uniform in the shader stage,
a value between zero and the value of <constant>GL_ACTIVE_SUBROUTINES</constant> minus one will be returned. Subroutine indices
are assigned using consecutive integers in the range from zero to the value of <constant>GL_ACTIVE_SUBROUTINES</constant> minus
one for the shader stage.
</para>
</refsect1>
<refsect1 xml:id="errors"><title>Errors</title>
<para>
<constant>GL_INVALID_ENUM</constant> is generated if <parameter>shadertype</parameter> or <parameter>pname</parameter>
is not one of the accepted values.
</para>
<para>
<constant>GL_INVALID_VALUE</constant> is generated if <parameter>program</parameter> is not the name of an
existing program object.
</para>
</refsect1>
<refsect1 xml:id="versions"><title>Version Support</title>
<informaltable>
<tgroup cols="13" align="left">
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apifunchead.xml" xpointer="xpointer(/*/*)"/>
<tbody>
<row>
<entry><function>glGetSubroutineIndex</function></entry>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='40']/*)"/>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 xml:id="seealso"><title>See Also</title>
<para>
<citerefentry><refentrytitle>glGetProgram</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glGetActiveSubroutineUniform</refentrytitle></citerefentry>,
<citerefentry><refentrytitle>glGetActiveSubroutineUniformName</refentrytitle></citerefentry>
</para>
</refsect1>
<refsect1 xml:id="Copyright"><title>Copyright</title>
<para>
Copyright <trademark class="copyright"/> 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.
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://opencontent.org/openpub/">http://opencontent.org/openpub/</link>.
</para>
</refsect1>
</refentry>
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