
<refentry id="glCopyColorSubTable">
    <refmeta>
        <refmetainfo>
            <copyright>
                <year>1991-2006</year>
                <holder>Silicon Graphics, Inc.</holder>
            </copyright>
        </refmetainfo>
        <refentrytitle>glCopyColorSubTable</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>glCopyColorSubTable</refname>
        <refpurpose>respecify a portion of a color table</refpurpose>
    </refnamediv>
    <refsynopsisdiv><title>C Specification</title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>void <function>glCopyColorSubTable</function></funcdef>
                <paramdef>GLenum <parameter>target</parameter></paramdef>
                <paramdef>GLsizei <parameter>start</parameter></paramdef>
                <paramdef>GLint <parameter>x</parameter></paramdef>
                <paramdef>GLint <parameter>y</parameter></paramdef>
                <paramdef>GLsizei <parameter>width</parameter></paramdef>
            </funcprototype>
        </funcsynopsis>
    </refsynopsisdiv>
    <refsect1 id="parameters"><title>Parameters</title>
        <variablelist>
        <varlistentry>
            <term><parameter>target</parameter></term>
            <listitem>
                <para>
                    Must be one of
                    <constant>GL_COLOR_TABLE</constant>,
                    <constant>GL_POST_CONVOLUTION_COLOR_TABLE</constant>, or
                    <constant>GL_POST_COLOR_MATRIX_COLOR_TABLE</constant>.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>start</parameter></term>
            <listitem>
                <para>
                    The starting index of the portion of the color table to be replaced.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>x</parameter></term>
            <term><parameter>y</parameter></term>
            <listitem>
                <para>
                    The window coordinates of the left corner of the row of pixels to be
                    copied.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>width</parameter></term>
            <listitem>
                <para>
                    The number of table entries to replace.
                </para>
            </listitem>
        </varlistentry>
        </variablelist>
    </refsect1>
    <refsect1 id="description"><title>Description</title>
        <para>
            <function>glCopyColorSubTable</function> is used to respecify a contiguous portion of a color table previously
            defined using <citerefentry><refentrytitle>glColorTable</refentrytitle></citerefentry>.  The pixels copied from the framebuffer
            replace the portion of the existing table from indices <parameter>start</parameter> to
            <inlineequation><mml:math>
                <!-- eqn: start + x - 1:-->
                <mml:mrow>
                    <mml:mi mathvariant="italic">start</mml:mi>
                    <mml:mo>+</mml:mo>
                    <mml:mi mathvariant="italic">x</mml:mi>
                    <mml:mo>-</mml:mo>
                    <mml:mn>1</mml:mn>
                </mml:mrow>
            </mml:math></inlineequation>,
            inclusive.  This region may not include any
            entries outside the range of the color table, as was originally specified.
            It is not an error to specify a subtexture with width of 0, but such a
            specification has no effect.
        </para>
    </refsect1>
    <refsect1 id="notes"><title>Notes</title>
        <para>
            <function>glCopyColorSubTable</function> is present only if <code>ARB_imaging</code> is returned when <citerefentry><refentrytitle>glGetString</refentrytitle></citerefentry>
            is called with an argument of <constant>GL_EXTENSIONS</constant>.
        </para>
    </refsect1>
    <refsect1 id="errors"><title>Errors</title>
        <para>
            <constant>GL_INVALID_VALUE</constant> is generated if <parameter>target</parameter> is not a previously defined
            color table.
        </para>
        <para>
            <constant>GL_INVALID_VALUE</constant> is generated if <parameter>target</parameter> is not one of the allowable
            values.
        </para>
        <para>
            <constant>GL_INVALID_VALUE</constant> is generated if 
            <inlineequation><mml:math>
                <!-- eqn: start + x > width:-->
                <mml:mrow>
                    <mml:mrow>
                        <mml:mi mathvariant="italic">start</mml:mi>
                        <mml:mo>+</mml:mo>
                        <mml:mi mathvariant="italic">x</mml:mi>
                    </mml:mrow>
                    <mml:mo>&gt;</mml:mo>
                    <mml:mi mathvariant="italic">width</mml:mi>
                </mml:mrow>
            </mml:math></inlineequation>.
        </para>
        <para>
            <constant>GL_INVALID_OPERATION</constant> is generated if <function>glCopyColorSubTable</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>glGetColorTable</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glGetColorTableParameter</refentrytitle></citerefentry>
        </para>
    </refsect1>
    <refsect1 id="seealso"><title>See Also</title>
        <para>
            <citerefentry><refentrytitle>glColorSubTable</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glColorTableParameter</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glCopyColorTable</refentrytitle></citerefentry>,
            <function>glCopyColorSubTable</function>,
            <citerefentry><refentrytitle>glGetColorTable</refentrytitle></citerefentry>
        </para>
    </refsect1>
    <refsect1 id="Copyright"><title>Copyright</title>
        <para>
            Copyright <trademark class="copyright"></trademark> 1991-2006
            Silicon Graphics, Inc. This document is licensed under the SGI
            Free Software B License. For details, see
            <ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
        </para>
    </refsect1>
</refentry>
