585 lines
27 KiB
XML
585 lines
27 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
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"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
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<refentry id="glPixelMap">
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<refmeta>
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<refmetainfo>
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<copyright>
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<year>1991-2006</year>
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<holder>Silicon Graphics, Inc.</holder>
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</copyright>
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</refmetainfo>
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<refentrytitle>glPixelMap</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glPixelMap</refname>
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<refpurpose>set up pixel transfer maps</refpurpose>
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</refnamediv>
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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glPixelMapfv</function></funcdef>
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<paramdef>GLenum <parameter>map</parameter></paramdef>
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<paramdef>GLsizei <parameter>mapsize</parameter></paramdef>
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<paramdef>const GLfloat * <parameter>values</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glPixelMapuiv</function></funcdef>
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<paramdef>GLenum <parameter>map</parameter></paramdef>
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<paramdef>GLsizei <parameter>mapsize</parameter></paramdef>
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<paramdef>const GLuint * <parameter>values</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glPixelMapusv</function></funcdef>
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<paramdef>GLenum <parameter>map</parameter></paramdef>
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<paramdef>GLsizei <parameter>mapsize</parameter></paramdef>
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<paramdef>const GLushort * <parameter>values</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<!-- eqn: ignoring delim $$ -->
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<refsect1 id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>map</parameter></term>
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<listitem>
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<para>
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Specifies a symbolic map name.
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Must be one of the following:
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<constant>GL_PIXEL_MAP_I_TO_I</constant>,
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<constant>GL_PIXEL_MAP_S_TO_S</constant>,
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<constant>GL_PIXEL_MAP_I_TO_R</constant>,
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<constant>GL_PIXEL_MAP_I_TO_G</constant>,
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<constant>GL_PIXEL_MAP_I_TO_B</constant>,
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<constant>GL_PIXEL_MAP_I_TO_A</constant>,
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<constant>GL_PIXEL_MAP_R_TO_R</constant>,
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<constant>GL_PIXEL_MAP_G_TO_G</constant>,
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<constant>GL_PIXEL_MAP_B_TO_B</constant>, or
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<constant>GL_PIXEL_MAP_A_TO_A</constant>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>mapsize</parameter></term>
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<listitem>
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<para>
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Specifies the size of the map being defined.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>values</parameter></term>
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<listitem>
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<para>
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Specifies an array of <parameter>mapsize</parameter> values.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id="description"><title>Description</title>
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<para>
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<function>glPixelMap</function> sets up translation tables,
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or <emphasis>maps</emphasis>,
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used by
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<citerefentry><refentrytitle>glCopyPixels</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCopyTexImage1D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCopyTexImage2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCopyTexSubImage1D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCopyTexSubImage2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCopyTexSubImage3D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDrawPixels</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glReadPixels</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexImage1D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexImage3D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexSubImage1D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexSubImage2D</refentrytitle></citerefentry>, and
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<citerefentry><refentrytitle>glTexSubImage3D</refentrytitle></citerefentry>.
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Additionally, if the <code>ARB_imaging</code> subset is supported, the
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routines
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<citerefentry><refentrytitle>glColorTable</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glColorSubTable</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glConvolutionFilter1D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glConvolutionFilter2D</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glHistogram</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glMinmax</refentrytitle></citerefentry>, and
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<citerefentry><refentrytitle>glSeparableFilter2D</refentrytitle></citerefentry>.
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Use of these maps is described completely in the
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<citerefentry><refentrytitle>glPixelTransfer</refentrytitle></citerefentry> reference page,
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and partly in the reference pages for the pixel and texture image commands.
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Only the specification of the maps is described in this reference page.
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</para>
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<para>
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<parameter>map</parameter> is a symbolic map name,
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indicating one of ten maps to set.
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<parameter>mapsize</parameter> specifies the number of entries in the map,
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and <parameter>values</parameter> is a pointer to an array of <parameter>mapsize</parameter> map values.
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</para>
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<para>
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If a non-zero named buffer object is bound to the <constant>GL_PIXEL_UNPACK_BUFFER</constant> target
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(see <citerefentry><refentrytitle>glBindBuffer</refentrytitle></citerefentry>) while a pixel transfer map is
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specified, <parameter>values</parameter> is treated as a byte offset into the buffer object's data store.
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</para>
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<para>
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The ten maps are as follows:
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</para>
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<variablelist>
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<varlistentry>
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<term><constant>GL_PIXEL_MAP_I_TO_I</constant></term>
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<listitem>
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<para>
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Maps color indices to color indices.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_PIXEL_MAP_S_TO_S</constant></term>
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<listitem>
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<para>
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Maps stencil indices to stencil indices.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_PIXEL_MAP_I_TO_R</constant></term>
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<listitem>
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<para>
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Maps color indices to red components.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_PIXEL_MAP_I_TO_G</constant></term>
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<listitem>
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<para>
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Maps color indices to green components.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_PIXEL_MAP_I_TO_B</constant></term>
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<listitem>
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<para>
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Maps color indices to blue components.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_PIXEL_MAP_I_TO_A</constant></term>
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<listitem>
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<para>
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Maps color indices to alpha components.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_PIXEL_MAP_R_TO_R</constant></term>
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<listitem>
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<para>
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Maps red components to red components.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_PIXEL_MAP_G_TO_G</constant></term>
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<listitem>
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<para>
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Maps green components to green components.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_PIXEL_MAP_B_TO_B</constant></term>
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<listitem>
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<para>
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Maps blue components to blue components.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>GL_PIXEL_MAP_A_TO_A</constant></term>
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<listitem>
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<para>
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Maps alpha components to alpha components.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>
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The entries in a map can be specified as single-precision
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floating-point numbers,
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unsigned short integers,
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or unsigned int integers.
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Maps that store color component values
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(all but <constant>GL_PIXEL_MAP_I_TO_I</constant> and <constant>GL_PIXEL_MAP_S_TO_S</constant>)
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retain their values in floating-point format,
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with unspecified mantissa and exponent sizes.
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Floating-point values specified by <function>glPixelMapfv</function> are converted directly
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to the internal floating-point format of these maps,
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then clamped to the range [0,1].
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Unsigned integer values specified by <function>glPixelMapusv</function> and
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<function>glPixelMapuiv</function> are converted linearly such that
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the largest representable integer maps to 1.0,
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and 0 maps to 0.0.
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</para>
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<para>
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Maps that store indices,
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<constant>GL_PIXEL_MAP_I_TO_I</constant> and <constant>GL_PIXEL_MAP_S_TO_S</constant>,
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retain their values in fixed-point format,
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with an unspecified number of bits to the right of the binary point.
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Floating-point values specified by <function>glPixelMapfv</function> are converted directly
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to the internal fixed-point format of these maps.
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Unsigned integer values specified by <function>glPixelMapusv</function> and
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<function>glPixelMapuiv</function> specify integer values,
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with all 0's to the right of the binary point.
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</para>
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<para>
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The following table shows the initial sizes and values for each of the maps.
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Maps that are indexed by either color or stencil indices must have
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<parameter>mapsize</parameter> =
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<inlineequation><mml:math>
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<!-- eqn: 2 sup n:-->
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<mml:msup><mml:mn>2</mml:mn>
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<mml:mi mathvariant="italic">n</mml:mi>
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</mml:msup>
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</mml:math></inlineequation>
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for some
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<inlineequation><mml:math><mml:mi mathvariant="italic">n</mml:mi></mml:math></inlineequation>
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or the results are undefined.
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The maximum allowable size for each map depends on the implementation
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and can be determined by calling <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument
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<constant>GL_MAX_PIXEL_MAP_TABLE</constant>.
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The single maximum applies to all maps; it is at
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least 32.
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</para>
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<informaltable frame="topbot">
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<tgroup cols="5" align="left">
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<colspec colwidth="4*" />
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<colspec colwidth="2*" align="center"/>
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<colspec colwidth="2*" align="center"/>
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<colspec colwidth="1*" align="center"/>
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<colspec colwidth="1*" align="center"/>
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<thead>
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<row>
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<entry rowsep="1" align="left"><emphasis role="bold">
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<parameter>map</parameter>
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</emphasis></entry>
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<entry rowsep="1" align="center"><emphasis role="bold">
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Lookup Index
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</emphasis></entry>
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<entry rowsep="1" align="center"><emphasis role="bold">
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Lookup Value
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</emphasis></entry>
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<entry rowsep="1" align="center"><emphasis role="bold">
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Initial Size
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</emphasis></entry>
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<entry rowsep="1" align="center"><emphasis role="bold">
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Initial Value
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</emphasis></entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry align="left">
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<constant>GL_PIXEL_MAP_I_TO_I</constant>
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</entry>
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<entry align="center">
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color index
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</entry>
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<entry align="center">
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color index
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</entry>
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<entry align="center">
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1
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</entry>
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<entry align="center">
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0
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GL_PIXEL_MAP_S_TO_S</constant>
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</entry>
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<entry align="center">
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stencil index
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</entry>
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<entry align="center">
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stencil index
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</entry>
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<entry align="center">
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1
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</entry>
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<entry align="center">
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0
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GL_PIXEL_MAP_I_TO_R</constant>
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</entry>
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<entry align="center">
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color index
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</entry>
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<entry align="center">
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R
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</entry>
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<entry align="center">
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1
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</entry>
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<entry align="center">
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0
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GL_PIXEL_MAP_I_TO_G</constant>
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</entry>
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<entry align="center">
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color index
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</entry>
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<entry align="center">
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G
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</entry>
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<entry align="center">
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1
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</entry>
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<entry align="center">
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0
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GL_PIXEL_MAP_I_TO_B</constant>
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</entry>
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<entry align="center">
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color index
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</entry>
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<entry align="center">
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B
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</entry>
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<entry align="center">
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1
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</entry>
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<entry align="center">
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0
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GL_PIXEL_MAP_I_TO_A</constant>
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</entry>
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<entry align="center">
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color index
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</entry>
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<entry align="center">
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A
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</entry>
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<entry align="center">
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1
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</entry>
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<entry align="center">
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0
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GL_PIXEL_MAP_R_TO_R</constant>
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</entry>
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<entry align="center">
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R
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</entry>
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<entry align="center">
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R
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</entry>
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<entry align="center">
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1
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</entry>
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<entry align="center">
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0
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GL_PIXEL_MAP_G_TO_G</constant>
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</entry>
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<entry align="center">
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G
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</entry>
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<entry align="center">
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G
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</entry>
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<entry align="center">
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1
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</entry>
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<entry align="center">
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0
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GL_PIXEL_MAP_B_TO_B</constant>
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</entry>
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<entry align="center">
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B
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</entry>
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<entry align="center">
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B
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</entry>
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<entry align="center">
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1
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</entry>
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<entry align="center">
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0
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</entry>
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</row>
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<row>
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<entry align="left">
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<constant>GL_PIXEL_MAP_A_TO_A</constant>
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</entry>
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<entry align="center">
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A
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</entry>
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<entry align="center">
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A
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</entry>
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<entry align="center">
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1
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</entry>
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<entry align="center">
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0
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</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</refsect1>
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<refsect1 id="errors"><title>Errors</title>
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<para>
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<constant>GL_INVALID_ENUM</constant> is generated if <parameter>map</parameter> is not an accepted value.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if <parameter>mapsize</parameter> is less than one
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or larger than <constant>GL_MAX_PIXEL_MAP_TABLE</constant>.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if <parameter>map</parameter> is
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<constant>GL_PIXEL_MAP_I_TO_I</constant>,
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<constant>GL_PIXEL_MAP_S_TO_S</constant>,
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<constant>GL_PIXEL_MAP_I_TO_R</constant>,
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<constant>GL_PIXEL_MAP_I_TO_G</constant>,
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<constant>GL_PIXEL_MAP_I_TO_B</constant>, or
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<constant>GL_PIXEL_MAP_I_TO_A</constant>,
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and <parameter>mapsize</parameter> is not a power of two.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if a non-zero buffer object name is bound to the
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<constant>GL_PIXEL_UNPACK_BUFFER</constant> target and the buffer object's data store is currently mapped.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if a non-zero buffer object name is bound to the
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<constant>GL_PIXEL_UNPACK_BUFFER</constant> target and the data would be unpacked from the buffer
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object such that the memory reads required would exceed the data store size.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated by <function>glPixelMapfv</function> if a non-zero buffer object name is bound to the
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<constant>GL_PIXEL_UNPACK_BUFFER</constant> target and <parameter>values</parameter> is not evenly divisible
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into the number of bytes needed to store in memory a GLfloat datum.
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</para>
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|
<para>
|
|
<constant>GL_INVALID_OPERATION</constant> is generated by <function>glPixelMapuiv</function> if a non-zero buffer object name is bound to the
|
|
<constant>GL_PIXEL_UNPACK_BUFFER</constant> target and <parameter>values</parameter> is not evenly divisible
|
|
into the number of bytes needed to store in memory a GLuint datum.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_OPERATION</constant> is generated by <function>glPixelMapusv</function> if a non-zero buffer object name is bound to the
|
|
<constant>GL_PIXEL_UNPACK_BUFFER</constant> target and <parameter>values</parameter> is not evenly divisible
|
|
into the number of bytes needed to store in memory a GLushort datum.
|
|
</para>
|
|
<para>
|
|
<constant>GL_INVALID_OPERATION</constant> is generated if <function>glPixelMap</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>glGetPixelMap</refentrytitle></citerefentry>
|
|
</para>
|
|
<para>
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PIXEL_MAP_I_TO_I_SIZE</constant>
|
|
</para>
|
|
<para>
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PIXEL_MAP_S_TO_S_SIZE</constant>
|
|
</para>
|
|
<para>
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PIXEL_MAP_I_TO_R_SIZE</constant>
|
|
</para>
|
|
<para>
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PIXEL_MAP_I_TO_G_SIZE</constant>
|
|
</para>
|
|
<para>
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PIXEL_MAP_I_TO_B_SIZE</constant>
|
|
</para>
|
|
<para>
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PIXEL_MAP_I_TO_A_SIZE</constant>
|
|
</para>
|
|
<para>
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PIXEL_MAP_R_TO_R_SIZE</constant>
|
|
</para>
|
|
<para>
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PIXEL_MAP_G_TO_G_SIZE</constant>
|
|
</para>
|
|
<para>
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PIXEL_MAP_B_TO_B_SIZE</constant>
|
|
</para>
|
|
<para>
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PIXEL_MAP_A_TO_A_SIZE</constant>
|
|
</para>
|
|
<para>
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_MAX_PIXEL_MAP_TABLE</constant>
|
|
</para>
|
|
<para>
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PIXEL_UNPACK_BUFFER_BINDING</constant>
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="seealso"><title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>glColorTable</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glColorSubTable</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glConvolutionFilter1D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glConvolutionFilter2D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glCopyPixels</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glCopyTexImage1D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glCopyTexImage2D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glCopyTexSubImage1D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glCopyTexSubImage2D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glDrawPixels</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glHistogram</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glMinmax</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glPixelStore</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glPixelTransfer</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glReadPixels</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glSeparableFilter2D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glTexImage1D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glTexImage3D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glTexSubImage1D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glTexSubImage2D</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glTexSubImage3D</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>
|