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<refentry id="glIsProgram">
    <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 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 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 id="notes"><title>Notes</title>
	<para><function>glIsProgram</function> is available only if the
	GL version is 2.0 or greater.</para>

	<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 id="errors"><title>Errors</title>
	<para><constant>GL_INVALID_OPERATION</constant> is generated if
	<function>glIsProgram</function> is executed between the
	execution of
	<citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>
	and the corresponding execution of
	<citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>.</para>
    </refsect1>
    <refsect1 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>glGetProgram</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 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 id="Copyright"><title>Copyright</title>
        <para>
            Copyright <trademark class="copyright"></trademark> 2003-2005 3Dlabs Inc. Ltd. 
            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>
