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<refentry id="glUniformSubroutines">
    <refentryinfo>
        <copyright>
            <year>2010-2013</year>
            <holder>Khronos Group.</holder>
        </copyright>
    </refentryinfo>
    <refmeta>
        <refentrytitle>glUniformSubroutines</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>glUniformSubroutines</refname>
        <refpurpose>load active subroutine uniforms</refpurpose>
    </refnamediv>
    <refsynopsisdiv><title>C Specification</title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>void <function>glUniformSubroutinesuiv</function></funcdef>
                <paramdef>GLenum <parameter>shadertype</parameter></paramdef>
                <paramdef>GLsizei <parameter>count</parameter></paramdef>
                <paramdef>const GLuint *<parameter>indices</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>count</parameter></term>
            <listitem>
                <para>
                    Specifies the number of uniform indices stored in <parameter>indices</parameter>.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>indices</parameter></term>
            <listitem>
                <para>
                    Specifies the address of an array holding the indices to load into the shader subroutine variables.
                </para>
            </listitem>
        </varlistentry>
        </variablelist>
    </refsect1>
    <refsect1 id="description"><title>Description</title>
        <para>
            <function>glUniformSubroutines</function> loads all active subroutine uniforms for shader stage
            <parameter>shadertype</parameter> of the current program with subroutine indices from <parameter>indices</parameter>,
            storing <parameter>indices[i]</parameter> into the uniform at location <parameter>i</parameter>.
            <parameter>count</parameter> must be equal to the value of <constant>GL_ACTIVE_SUBROUTINE_UNIFORM_LOCATIONS</constant>
            for the program currently in use at shader stage <parameter>shadertype</parameter>. Furthermore, all values in
            <parameter>indices</parameter> must be less than the value of <constant>GL_ACTIVE_SUBROUTINES</constant>
            for the shader stage.
        </para>
    </refsect1>
    <refsect1 id="errors"><title>Errors</title>
        <para>
            <constant>GL_INVALID_OPERATION</constant> is generated if no program object is current.
        </para>
        <para>
            <constant>GL_INVALID_VALUE</constant> is generated if <parameter>count</parameter> is not equal to the value
            of <constant>GL_ACTIVE_SUBROUTINE_UNIFORM_LOCATIONS</constant> for the shader stage <parameter>shadertype</parameter>
            of the current program.
        </para>
        <para>
            <constant>GL_INVALID_VALUE</constant> is generated if any value in <parameter>indices</parameter> is geater
            than or equal to the value of <constant>GL_ACTIVE_SUBROUTINES</constant> for the shader stage <parameter>shadertype</parameter>
            of the current program.
        </para>
        <para>
            <constant>GL_INVALID_ENUM</constant> is generated if <parameter>shadertype</parameter> is not one of the accepted values.
        </para>
    </refsect1>
    <refsect1 id="associatedgets"><title>Associated Gets</title>
        <para>
            <citerefentry><refentrytitle>glGetProgramStage</refentrytitle></citerefentry> with argument <constant>GL_ACTIVE_SUBROUTINES</constant>
        </para>
        <para>
            <citerefentry><refentrytitle>glGetProgramStage</refentrytitle></citerefentry> with argument <constant>GL_ACTIVE_SUBROUTINE_UNIFORM_LOCATIONS</constant>
        </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>glGetProgramStage</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>
