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<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="glIsProgram">
    <info>
        <copyright>
            <year>2003-2005</year>
            <holder>3Dlabs Inc. Ltd.</holder>
        </copyright>
        <copyright>
            <year>2010-2014</year>
            <holder>Khronos Group</holder>
        </copyright>
    </info>
    <refmeta>
        <refentrytitle>glIsProgram</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>glIsProgram</refname>
        <refpurpose>Determines if a name corresponds to a program object</refpurpose>
    </refnamediv>
    <refsynopsisdiv><title>C Specification</title>
    <funcsynopsis>
        <funcprototype>
        <funcdef>GLboolean <function>glIsProgram</function></funcdef>
        <paramdef>GLuint <parameter>program</parameter></paramdef>
        </funcprototype>
    </funcsynopsis>
    </refsynopsisdiv>
    <refsect1 xml:id="parameters"><title>Parameters</title>
    <variablelist>
        <varlistentry>
        <term><parameter>program</parameter></term>
        <listitem>
            <para>Specifies a potential program object.</para>
        </listitem>
        </varlistentry>
    </variablelist>
    </refsect1>
    <refsect1 xml:id="description"><title>Description</title>
    <para><function>glIsProgram</function> returns
    <constant>GL_TRUE</constant> if <parameter>program</parameter>
    is the name of a program object previously created with 
        <citerefentry><refentrytitle>glCreateProgram</refentrytitle></citerefentry> 
        and not yet deleted with <citerefentry><refentrytitle>glDeleteProgram</refentrytitle></citerefentry>.
    If <parameter>program</parameter> is zero or a non-zero value that
    is not the name of a program object, or if an error occurs, 
        <function>glIsProgram</function> returns <constant>GL_FALSE</constant>.</para>
    </refsect1>
    <refsect1 xml:id="notes"><title>Notes</title>
    <para>No error is generated if <parameter>program</parameter> is
    not a valid program object name.</para>

    <para>A program object marked for deletion with <citerefentry><refentrytitle>glDeleteProgram</refentrytitle></citerefentry>
        but still in use as part of current rendering state is still considered 
        a program object and <function>glIsProgram</function> will return <constant>GL_TRUE</constant>.</para>
    </refsect1>
    <refsect1 xml:id="associatedgets"><title>Associated Gets</title>
    <para><citerefentry><refentrytitle>glGet</refentrytitle></citerefentry>
    with the argument <constant>GL_CURRENT_PROGRAM</constant></para>

    <para><citerefentry><refentrytitle>glGetActiveAttrib</refentrytitle></citerefentry>
    with arguments <parameter>program</parameter> and the index of
    an active attribute variable</para>

    <para><citerefentry><refentrytitle>glGetActiveUniform</refentrytitle></citerefentry>
    with arguments <parameter>program</parameter> and the index of
    an active uniform variable</para>

    <para><citerefentry><refentrytitle>glGetAttachedShaders</refentrytitle></citerefentry>
    with argument <parameter>program</parameter></para>

    <para><citerefentry><refentrytitle>glGetAttribLocation</refentrytitle></citerefentry>
    with arguments <parameter>program</parameter> and the name of an
    attribute variable</para>

    <para><citerefentry><refentrytitle>glGetProgramiv</refentrytitle></citerefentry>
    with arguments <parameter>program</parameter> and the parameter
    to be queried</para>

    <para><citerefentry><refentrytitle>glGetProgramInfoLog</refentrytitle></citerefentry>
    with argument <parameter>program</parameter></para>

    <para><citerefentry><refentrytitle>glGetUniform</refentrytitle></citerefentry>
    with arguments <parameter>program</parameter> and the location
    of a uniform variable</para>

    <para><citerefentry><refentrytitle>glGetUniformLocation</refentrytitle></citerefentry>
    with arguments <parameter>program</parameter> and the name of a
    uniform variable</para>
    </refsect1>
    <refsect1 xml:id="versions">
        <title>API Version Support</title>
        <informaltable>
            <tgroup cols="3" align="left">
                <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apifunchead.xml" xpointer="xpointer(/*/*)"/>
                <tbody>
                    <row>
                        <entry>glIsProgram</entry>
                        <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='es20']/*)"/>
                    </row>
                </tbody>
            </tgroup>
        </informaltable>
    </refsect1>
    <refsect1 xml:id="seealso"><title>See Also</title>
    <para><citerefentry><refentrytitle>glAttachShader</refentrytitle></citerefentry>,
    <citerefentry><refentrytitle>glBindAttribLocation</refentrytitle></citerefentry>,
    <citerefentry><refentrytitle>glCreateProgram</refentrytitle></citerefentry>,
    <citerefentry><refentrytitle>glDeleteProgram</refentrytitle></citerefentry>,
    <citerefentry><refentrytitle>glDetachShader</refentrytitle></citerefentry>,
    <citerefentry><refentrytitle>glLinkProgram</refentrytitle></citerefentry>,
    <citerefentry><refentrytitle>glUniform</refentrytitle></citerefentry>,
    <citerefentry><refentrytitle>glUseProgram</refentrytitle></citerefentry>,
    <citerefentry><refentrytitle>glValidateProgram</refentrytitle></citerefentry></para>
    </refsect1>
    <refsect1 xml:id="Copyright"><title>Copyright</title>
        <para>
            Copyright <trademark class="copyright"/> 2003-2005 3Dlabs Inc. Ltd.
            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>
