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<refentry id="glGetProgram">
    <refmeta>
	<refentrytitle>glGetProgram</refentrytitle>
	<manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
	<refname>glGetProgramiv</refname>
	<refpurpose>Returns a parameter from a program object</refpurpose>
    </refnamediv>
    <refsynopsisdiv><title>C Specification</title>
	<funcsynopsis>
	    <funcprototype>
		<funcdef>void <function>glGetProgramiv</function></funcdef>
		<paramdef>GLuint <parameter>program</parameter></paramdef>
		<paramdef>GLenum <parameter>pname</parameter></paramdef>
		<paramdef>GLint *<parameter>params</parameter></paramdef>
	    </funcprototype>
	</funcsynopsis>
    </refsynopsisdiv>
    <refsect1 id="parameters"><title>Parameters</title>
	<variablelist>
	    <varlistentry>
		<term><parameter>program</parameter></term>
		<listitem>
		    <para>Specifies the program object to be
		    queried.</para>
		</listitem>
	    </varlistentry>
	    <varlistentry>
		<term><parameter>pname</parameter></term>
		<listitem>
		    <para>Specifies the object parameter. Accepted
		    symbolic names are
		    <constant>GL_DELETE_STATUS</constant>,
		    <constant>GL_LINK_STATUS</constant>,
		    <constant>GL_VALIDATE_STATUS</constant>,
		    <constant>GL_INFO_LOG_LENGTH</constant>,
		    <constant>GL_ATTACHED_SHADERS</constant>,
		    <constant>GL_ACTIVE_ATTRIBUTES</constant>,
		    <constant>GL_ACTIVE_ATTRIBUTE_MAX_LENGTH</constant>,
		    <constant>GL_ACTIVE_UNIFORMS</constant>,
		    <constant>GL_ACTIVE_UNIFORM_MAX_LENGTH</constant>.</para>
		</listitem>
	    </varlistentry>
	    <varlistentry>
		<term><parameter>params</parameter></term>
		<listitem>
		    <para>Returns the requested object parameter.</para>
		</listitem>
	    </varlistentry>
	</variablelist>
    </refsect1>
    <refsect1 id="description"><title>Description</title>
	<para><function>glGetProgram</function>
	returns in <parameter>params</parameter>
	the value of a parameter for a specific program object. The following parameters are defined:</para>

	<variablelist>
	    <varlistentry>
		<term><constant>GL_DELETE_STATUS</constant></term>
		<listitem>
		    <para>
		    </para>
		    <para> <parameter>params</parameter> returns
		    <constant>GL_TRUE</constant> if
		    <parameter>program</parameter> is currently flagged
		    for deletion, and <constant>GL_FALSE</constant>
		    otherwise.</para>
		</listitem>
	    </varlistentry>

	    <varlistentry>
		<term><constant>GL_LINK_STATUS</constant></term>
		<listitem>
		    <para>
		    </para>
		    <para> <parameter>params</parameter> returns
		    <constant>GL_TRUE</constant> if the last link
		    operation on <parameter>program</parameter> was
		    successful, and <constant>GL_FALSE</constant>
		    otherwise.</para>
		</listitem>
	    </varlistentry>

	    <varlistentry>
		<term><constant>GL_VALIDATE_STATUS</constant></term>
		<listitem>
		    <para>
		    </para>
		    <para> <parameter>params</parameter> returns
		    <constant>GL_TRUE</constant> or if the last
		    validation operation on
		    <parameter>program</parameter> was successful, and
		    <constant>GL_FALSE</constant>
		    otherwise.</para>
		</listitem>
	    </varlistentry>

	    <varlistentry>
		<term><constant>GL_INFO_LOG_LENGTH</constant></term>
		<listitem>
		    <para>
		    </para>
		    <para> <parameter>params</parameter> returns the
		    number of characters in the information log for
		    <parameter>program</parameter> including the null
		    termination character (i.e., the size of the
		    character buffer required to store the information
		    log). If <parameter>program</parameter> has no
		    information log, a value of 0 is
		    returned.</para>
		</listitem>
	    </varlistentry>

	    <varlistentry>
		<term><constant>GL_ATTACHED_SHADERS</constant></term>
		<listitem>
		    <para>
		    </para>
		    <para> <parameter>params</parameter> returns the
		    number of shader objects attached to
		    <parameter>program</parameter>.</para>
		</listitem>
	    </varlistentry>

	    <varlistentry>
		<term><constant>GL_ACTIVE_ATTRIBUTES</constant></term>
		<listitem>
		    <para>
		    </para>
		    <para> <parameter>params</parameter> returns the
		    number of active attribute variables for
		    <parameter>program</parameter>.</para>
		</listitem>
	    </varlistentry>

	    <varlistentry>
		<term><constant>GL_ACTIVE_ATTRIBUTE_MAX_LENGTH</constant></term>
		<listitem>
		    <para>
		    </para>
		    <para> <parameter>params</parameter> returns the
		    length of the longest active attribute name for
		    <parameter>program</parameter>, including the null
		    termination character (i.e., the size of the
		    character buffer required to store the longest
		    attribute name). If no active attributes exist, 0 is
		    returned.</para>
		</listitem>
	    </varlistentry>

	    <varlistentry>
		<term><constant>GL_ACTIVE_UNIFORMS</constant></term>
		<listitem>
		    <para>
		    </para>
		    <para> <parameter>params</parameter> returns the
		    number of active uniform variables for
		    <parameter>program</parameter>.</para>
		</listitem>
	    </varlistentry>

	    <varlistentry>
		<term><constant>GL_ACTIVE_UNIFORM_MAX_LENGTH</constant></term>
		<listitem>
		    <para>
		    </para>
		    <para> <parameter>params</parameter> returns the
		    length of the longest active uniform variable name
		    for <parameter>program</parameter>, including the
		    null termination character (i.e., the size of the
		    character buffer required to store the longest
		    uniform variable name). If no active uniform
		    variables exist, 0 is returned.</para>
		</listitem>
	    </varlistentry>
	</variablelist>
    </refsect1>
    <refsect1 id="notes"><title>Notes</title>
	<para><function>glGetProgram</function> is available only if the
	GL version is 2.0 or greater.</para>

	<para>If an error is generated, no change is made to the
	contents of <parameter>params</parameter>.</para>
    </refsect1>
    <refsect1 id="errors"><title>Errors</title>
	<para><constant>GL_INVALID_VALUE</constant>
	is generated if <parameter>program</parameter>
	is not a value generated by OpenGL.</para>

	<para><constant>GL_INVALID_OPERATION</constant>
	is generated if <parameter>program</parameter>
	does not refer to a program object.</para>

	<para><constant>GL_INVALID_ENUM</constant>
	is generated if <parameter>pname</parameter>
	is not an accepted value.</para>

	<para><constant>GL_INVALID_OPERATION</constant> is generated if
	<function>glGetProgram</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>glGetActiveAttrib</refentrytitle></citerefentry>
	with argument <parameter>program</parameter></para>

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

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

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

	<para><citerefentry><refentrytitle>glIsProgram</refentrytitle></citerefentry>
	<parameter></parameter></para>
    </refsect1>
    <refsect1 id="seealso"><title>See Also</title>
	<para><citerefentry><refentrytitle>glAttachShader</refentrytitle></citerefentry>,
	<citerefentry><refentrytitle>glCreateProgram</refentrytitle></citerefentry>,
	<citerefentry><refentrytitle>glDeleteProgram</refentrytitle></citerefentry>,
	<citerefentry><refentrytitle>glGetShader</refentrytitle></citerefentry>,
	<citerefentry><refentrytitle>glLinkProgram</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>
