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<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="glGetUniformIndices">
    <info>
        <copyright>
            <year>2010-2014</year>
            <holder>Khronos Group</holder>
        </copyright>
    </info>
    <refmeta>
        <refentrytitle>glGetUniformIndices</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>glGetUniformIndices</refname>
        <refpurpose>retrieve the index of a named uniform block</refpurpose>
    </refnamediv>
    <refsynopsisdiv>
        <title>C Specification</title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>void <function>glGetUniformIndices</function></funcdef>
                <paramdef>GLuint <parameter>program</parameter></paramdef>
                <paramdef>GLsizei <parameter>uniformCount</parameter></paramdef>
                <paramdef>const GLchar **<parameter>uniformNames</parameter></paramdef>
                <paramdef>GLuint *<parameter>uniformIndices</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 a program containing uniforms whose indices to query.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>uniformCount</parameter></term>
            <listitem>
                <para>
                    Specifies the number of uniforms whose indices to query.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>uniformNames</parameter></term>
            <listitem>
                <para>
                    Specifies the address of an array of pointers to buffers containing the names of the queried uniforms.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>uniformIndices</parameter></term>
            <listitem>
                <para>
                    Specifies the address of an array that will receive the indices of the uniforms.
                </para>
            </listitem>
        </varlistentry>
        </variablelist>
    </refsect1>
    <refsect1 xml:id="description"><title>Description</title>
        <para>
            <function>glGetUniformIndices</function> retrieves the indices of a number of uniforms within <parameter>program</parameter>.
        </para>
        <para>
            <parameter>program</parameter> must be the name of a program object for which the command
            <citerefentry><refentrytitle>glLinkProgram</refentrytitle></citerefentry> must have been called in the past, although it is not required that
            <citerefentry><refentrytitle>glLinkProgram</refentrytitle></citerefentry> must have succeeded. The link could have failed because the number
            of active uniforms exceeded the limit.
        </para>
        <para>
            <parameter>uniformCount</parameter> indicates both the number of elements in the array of names <parameter>uniformNames</parameter> and the
            number of indices that may be written to <parameter>uniformIndices</parameter>.
        </para>
        <para>
            <parameter>uniformNames</parameter> contains a list of <parameter>uniformCount</parameter> nul-terminated name strings identifying the
                        uniform names to be queried for indices. For each name string in <parameter>uniformNames</parameter>, the index assigned to the active
                        uniform of that name will be written to the corresponding element of <parameter>uniformIndices</parameter>. If a string in
                        <parameter>uniformNames</parameter> is not the name of an active uniform, the special value <constant>GL_INVALID_INDEX</constant> will
                        be written to the corresponding element of <parameter>uniformIndices</parameter>.
        </para>
        <para>
            If an error occurs, nothing is written to <parameter>uniformIndices</parameter>.
        </para>
    </refsect1>
    <refsect1 xml:id="errors"><title>Errors</title>
        <para>
            <constant>GL_INVALID_OPERATION</constant> is generated if <parameter>program</parameter> is not the name of a program object for which
            <citerefentry><refentrytitle>glLinkProgram</refentrytitle></citerefentry> has been called in the past.
        </para>
    </refsect1>
    <refsect1 xml:id="versions">
        <title>API Version Support</title>
        <informaltable>
            <tgroup cols="4" align="left">
                <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apifunchead.xml" xpointer="xpointer(/*/*)"/>
                <tbody>
                    <row>
                        <entry>glGetUniformIndices</entry>
                        <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='es30']/*)"/>
                    </row>
                </tbody>
            </tgroup>
        </informaltable>
    </refsect1>
    <refsect1 xml:id="seealso"><title>See Also</title>
        <para>
            <citerefentry><refentrytitle>glGetActiveUniform</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glGetActiveUniformsiv</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glLinkProgram</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>
