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<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="glGetProgramInfoLog">
    <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>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 xml: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 xml: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>glGetProgramiv</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 xml:id="notes"><title>Notes</title>
        <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 xml: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>

    </refsect1>
    <refsect1 xml:id="associatedgets"><title>Associated Gets</title>
        <para><citerefentry><refentrytitle>glGetProgramiv</refentrytitle></citerefentry>
        with argument <constant>GL_INFO_LOG_LENGTH</constant></para>

        <para><citerefentry><refentrytitle>glIsProgram</refentrytitle></citerefentry></para>
    </refsect1>
    <refsect1 xml:id="versions">
        <title>API Version Support</title>
        <informaltable>
            <tgroup cols="4" align="left">
                <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apifunchead.xml" xpointer="xpointer(/*/*)"/>
                <tbody>
                    <row>
                        <entry>glGetProgramInfoLog</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>glCompileShader</refentrytitle></citerefentry>,
        <citerefentry><refentrytitle>glGetShaderInfoLog</refentrytitle></citerefentry>,
        <citerefentry><refentrytitle>glLinkProgram</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>
