
<refentry id="glColorTableParameter">
    <refmeta>
        <refmetainfo>
            <copyright>
                <year>1991-2006</year>
                <holder>Silicon Graphics, Inc.</holder>
            </copyright>
        </refmetainfo>
        <refentrytitle>glColorTableParameter</refentrytitle>
        <manvolnum>3G</manvolnum>
    </refmeta>
    <refnamediv>
        <refname>glColorTableParameter</refname>
        <refpurpose>set color lookup table parameters</refpurpose>
    </refnamediv>
    <refsynopsisdiv><title>C Specification</title>
        <funcsynopsis>
            <funcprototype>
                <funcdef>void <function>glColorTableParameterfv</function></funcdef>
                <paramdef>GLenum <parameter>target</parameter></paramdef>
                <paramdef>GLenum <parameter>pname</parameter></paramdef>
                <paramdef>const GLfloat * <parameter>params</parameter></paramdef>
            </funcprototype>
        </funcsynopsis>
        <funcsynopsis>
            <funcprototype>
                <funcdef>void <function>glColorTableParameteriv</function></funcdef>
                <paramdef>GLenum <parameter>target</parameter></paramdef>
                <paramdef>GLenum <parameter>pname</parameter></paramdef>
                <paramdef>const GLint * <parameter>params</parameter></paramdef>
            </funcprototype>
        </funcsynopsis>
    </refsynopsisdiv>
    <!-- eqn: ignoring delim $$ -->
    <refsect1 id="parameters"><title>Parameters</title>
        <variablelist>
        <varlistentry>
            <term><parameter>target</parameter></term>
            <listitem>
                <para>
                    The target color table.
                    Must be
                    <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>pname</parameter></term>
            <listitem>
                <para>
                    The symbolic name of a texture color lookup table parameter.
                    Must be one of
                    <constant>GL_COLOR_TABLE_SCALE</constant> or
                    <constant>GL_COLOR_TABLE_BIAS</constant>.
                </para>
            </listitem>
        </varlistentry>
        <varlistentry>
            <term><parameter>params</parameter></term>
            <listitem>
                <para>
                    A pointer to an array where the values of the parameters are stored.
                </para>
            </listitem>
        </varlistentry>
        </variablelist>
    </refsect1>
    <refsect1 id="description"><title>Description</title>
        <para>
            <function>glColorTableParameter</function> is used to specify the scale factors and bias terms applied to
            color components when they are loaded into a color table. <parameter>target</parameter>
            indicates which color table the scale and bias terms apply to; it
            must be set to
            <constant>GL_COLOR_TABLE</constant>,
            <constant>GL_POST_CONVOLUTION_COLOR_TABLE</constant>, or
            <constant>GL_POST_COLOR_MATRIX_COLOR_TABLE</constant>.
        </para>
        <para>
            <parameter>pname</parameter> must be <constant>GL_COLOR_TABLE_SCALE</constant> to set the
            scale factors.
            In this case, <parameter>params</parameter> points to an array of four values, which are
            the scale factors for red, green, blue, and alpha, in that order.
        </para>
        <para>
            <parameter>pname</parameter> must be <constant>GL_COLOR_TABLE_BIAS</constant> to set the
            bias terms. In this case,
            <parameter>params</parameter> points to an array of four values, which are the bias
            terms for red, green, blue, and alpha, in that order.
        </para>
        <para>
            The color tables themselves are specified by
            calling <citerefentry><refentrytitle>glColorTable</refentrytitle></citerefentry>.
        </para>
    </refsect1>
    <refsect1 id="notes"><title>Notes</title>
        <para>
            <function>glColorTableParameter</function> is available only if <code>ARB_imaging</code> is returned from calling
            <citerefentry><refentrytitle>glGetString</refentrytitle></citerefentry> with an argument of <constant>GL_EXTENSIONS</constant>.
        </para>
    </refsect1>
    <refsect1 id="errors"><title>Errors</title>
        <para>
            <constant>GL_INVALID_ENUM</constant> is generated if <parameter>target</parameter> or <parameter>pname</parameter> is not
            an acceptable value.
        </para>
        <para>
            <constant>GL_INVALID_OPERATION</constant> is generated if <function>glColorTableParameter</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>glGetColorTableParameter</refentrytitle></citerefentry>
        </para>
    </refsect1>
    <refsect1 id="seealso"><title>See Also</title>
        <para>
            <citerefentry><refentrytitle>glColorTable</refentrytitle></citerefentry>,
            <citerefentry><refentrytitle>glPixelTransfer</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>
