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<refentry id="glGetProgramInfoLog">
    <refmeta>
	<refentrytitle>glGetProgramInfoLog</refentrytitle>
	<manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
	<refname>glGetProgramInfoLog</refname>
	<refpurpose>Returns the information log for a program object</refpurpose>
    </refnamediv>
    <refsynopsisdiv><title>C Specification</title>
	<funcsynopsis>
	    <funcprototype>
		<funcdef>void <function>glGetProgramInfoLog</function></funcdef>
		<paramdef>GLuint <parameter>program</parameter></paramdef>
		<paramdef>GLsizei <parameter>maxLength</parameter></paramdef>
		<paramdef>GLsizei *<parameter>length</parameter></paramdef>
		<paramdef>GLchar *<parameter>infoLog</parameter></paramdef>
	    </funcprototype>
	</funcsynopsis>
    </refsynopsisdiv>
    <refsect1 id="parameters"><title>Parameters</title>
	<variablelist>
	    <varlistentry>
		<term><parameter>program</parameter></term>
		<listitem>
		    <para>Specifies the program object whose information
		    log is to be queried.</para>
		</listitem>
	    </varlistentry>
	    <varlistentry>
		<term><parameter>maxLength</parameter></term>
		<listitem>
		    <para>Specifies the size of the character buffer for
		    storing the returned information log.</para>
		</listitem>
	    </varlistentry>
	    <varlistentry>
		<term><parameter>length</parameter></term>
		<listitem>
		    <para>Returns the length of the string returned in
		    <parameter>infoLog</parameter> (excluding the null
		    terminator).</para>
		</listitem>
	    </varlistentry>
	    <varlistentry>
		<term><parameter>infoLog</parameter></term>
		<listitem>
		    <para>Specifies an array of characters that is used
		    to return the information log.</para>
		</listitem>
	    </varlistentry>
	</variablelist>
    </refsect1>
    <refsect1 id="description"><title>Description</title>
	<para><function>glGetProgramInfoLog</function> returns the
	information log for the specified program object. The
	information log for a program object is modified when the
	program object is linked or validated. The string that is
	returned will be null terminated.</para>

	<para><function>glGetProgramInfoLog</function> returns in
	<parameter>infoLog</parameter> as much of the information log as
	it can, up to a maximum of <parameter>maxLength</parameter>
	characters. The number of characters actually returned,
	excluding the null termination character, is specified by
	<parameter>length</parameter>. If the length of the returned
	string is not required, a value of <constant>NULL</constant> can
	be passed in the <parameter>length</parameter> argument. The
	size of the buffer required to store the returned information
	log can be obtained by calling
	<citerefentry><refentrytitle>glGetProgram</refentrytitle></citerefentry>
	with the value <constant>GL_INFO_LOG_LENGTH</constant>. </para>

	<para>The information log for a program object is either an
	empty string, or a string containing information about the last
	link operation, or a string containing information about the
	last validation operation. It may contain diagnostic messages,
	warning messages, and other information. When a program object
	is created, its information log will be a string of length
	0.</para>
    </refsect1>
    <refsect1 id="notes"><title>Notes</title>
	<para><function>glGetProgramInfoLog</function> is available only
	if the GL version is 2.0 or greater.</para>

	<para>The information log for a program object is the OpenGL
	implementer's primary mechanism for conveying information about
	linking and validating. Therefore, the information log can be
	helpful to application developers during the development
	process, even when these operations are successful. Application
	developers should not expect different OpenGL implementations to
	produce identical information logs.</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> is not a program object.</para>

	<para><constant>GL_INVALID_VALUE</constant> is generated if
	<parameter>maxLength</parameter> is less than 0.</para>

	<para><constant>GL_INVALID_OPERATION</constant> is generated if
	<function>glGetProgramInfoLog</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>glGetProgram</refentrytitle></citerefentry>
	with argument <constant>GL_INFO_LOG_LENGTH</constant></para>

	<para><citerefentry><refentrytitle>glIsProgram</refentrytitle></citerefentry></para>
    </refsect1>
    <refsect1 id="seealso"><title>See Also</title>
	<para><citerefentry><refentrytitle>glCompileShader</refentrytitle></citerefentry>,
	<citerefentry><refentrytitle>glGetShaderInfoLog</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>
