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427 lines
22 KiB
XML
427 lines
22 KiB
XML
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<?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="glRasterPos">
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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>glRasterPos</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glRasterPos</refname>
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<refpurpose>specify the raster position for pixel operations</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>glRasterPos2s</function></funcdef>
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<paramdef>GLshort <parameter>x</parameter></paramdef>
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<paramdef>GLshort <parameter>y</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>glRasterPos2i</function></funcdef>
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<paramdef>GLint <parameter>x</parameter></paramdef>
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<paramdef>GLint <parameter>y</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>glRasterPos2f</function></funcdef>
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<paramdef>GLfloat <parameter>x</parameter></paramdef>
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<paramdef>GLfloat <parameter>y</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>glRasterPos2d</function></funcdef>
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<paramdef>GLdouble <parameter>x</parameter></paramdef>
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<paramdef>GLdouble <parameter>y</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>glRasterPos3s</function></funcdef>
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<paramdef>GLshort <parameter>x</parameter></paramdef>
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<paramdef>GLshort <parameter>y</parameter></paramdef>
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<paramdef>GLshort <parameter>z</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>glRasterPos3i</function></funcdef>
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<paramdef>GLint <parameter>x</parameter></paramdef>
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<paramdef>GLint <parameter>y</parameter></paramdef>
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<paramdef>GLint <parameter>z</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>glRasterPos3f</function></funcdef>
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<paramdef>GLfloat <parameter>x</parameter></paramdef>
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<paramdef>GLfloat <parameter>y</parameter></paramdef>
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<paramdef>GLfloat <parameter>z</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>glRasterPos3d</function></funcdef>
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<paramdef>GLdouble <parameter>x</parameter></paramdef>
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<paramdef>GLdouble <parameter>y</parameter></paramdef>
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<paramdef>GLdouble <parameter>z</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>glRasterPos4s</function></funcdef>
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<paramdef>GLshort <parameter>x</parameter></paramdef>
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<paramdef>GLshort <parameter>y</parameter></paramdef>
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<paramdef>GLshort <parameter>z</parameter></paramdef>
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<paramdef>GLshort <parameter>w</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>glRasterPos4i</function></funcdef>
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<paramdef>GLint <parameter>x</parameter></paramdef>
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<paramdef>GLint <parameter>y</parameter></paramdef>
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<paramdef>GLint <parameter>z</parameter></paramdef>
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<paramdef>GLint <parameter>w</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>glRasterPos4f</function></funcdef>
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<paramdef>GLfloat <parameter>x</parameter></paramdef>
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<paramdef>GLfloat <parameter>y</parameter></paramdef>
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<paramdef>GLfloat <parameter>z</parameter></paramdef>
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<paramdef>GLfloat <parameter>w</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>glRasterPos4d</function></funcdef>
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<paramdef>GLdouble <parameter>x</parameter></paramdef>
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<paramdef>GLdouble <parameter>y</parameter></paramdef>
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<paramdef>GLdouble <parameter>z</parameter></paramdef>
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<paramdef>GLdouble <parameter>w</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>x</parameter></term>
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<term><parameter>y</parameter></term>
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<term><parameter>z</parameter></term>
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<term><parameter>w</parameter></term>
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<listitem>
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<para>
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Specify the
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<inlineequation><mml:math><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>,
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<inlineequation><mml:math><mml:mi mathvariant="italic">y</mml:mi></mml:math></inlineequation>,
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<inlineequation><mml:math><mml:mi mathvariant="italic">z</mml:mi></mml:math></inlineequation>,
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and
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<inlineequation><mml:math><mml:mi mathvariant="italic">w</mml:mi></mml:math></inlineequation>
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object coordinates
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(if present)
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for the raster
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position.
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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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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glRasterPos2sv</function></funcdef>
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<paramdef>const GLshort * <parameter>v</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>glRasterPos2iv</function></funcdef>
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<paramdef>const GLint * <parameter>v</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>glRasterPos2fv</function></funcdef>
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<paramdef>const GLfloat * <parameter>v</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>glRasterPos2dv</function></funcdef>
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<paramdef>const GLdouble * <parameter>v</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>glRasterPos3sv</function></funcdef>
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<paramdef>const GLshort * <parameter>v</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>glRasterPos3iv</function></funcdef>
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<paramdef>const GLint * <parameter>v</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>glRasterPos3fv</function></funcdef>
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<paramdef>const GLfloat * <parameter>v</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>glRasterPos3dv</function></funcdef>
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<paramdef>const GLdouble * <parameter>v</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>glRasterPos4sv</function></funcdef>
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<paramdef>const GLshort * <parameter>v</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>glRasterPos4iv</function></funcdef>
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<paramdef>const GLint * <parameter>v</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>glRasterPos4fv</function></funcdef>
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<paramdef>const GLfloat * <parameter>v</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>glRasterPos4dv</function></funcdef>
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<paramdef>const GLdouble * <parameter>v</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1 id="parameters2"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>v</parameter></term>
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<listitem>
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<para>
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Specifies a pointer to an array of two,
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three,
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or four elements,
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specifying
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<inlineequation><mml:math><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>,
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<inlineequation><mml:math><mml:mi mathvariant="italic">y</mml:mi></mml:math></inlineequation>,
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<inlineequation><mml:math><mml:mi mathvariant="italic">z</mml:mi></mml:math></inlineequation>,
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and
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<inlineequation><mml:math><mml:mi mathvariant="italic">w</mml:mi></mml:math></inlineequation>
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coordinates, respectively.
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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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The GL maintains a 3D position in window coordinates.
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This position,
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called the raster position,
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is used to position pixel and bitmap write operations. It is
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maintained with subpixel accuracy.
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See <citerefentry><refentrytitle>glBitmap</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glDrawPixels</refentrytitle></citerefentry>, and <citerefentry><refentrytitle>glCopyPixels</refentrytitle></citerefentry>.
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</para>
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<para>
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The current raster position consists of three window coordinates
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(<inlineequation><mml:math><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>,
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<inlineequation><mml:math><mml:mi mathvariant="italic">y</mml:mi></mml:math></inlineequation>,
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<inlineequation><mml:math><mml:mi mathvariant="italic">z</mml:mi></mml:math></inlineequation>),
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a clip coordinate value
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(<inlineequation><mml:math><mml:mi mathvariant="italic">w</mml:mi></mml:math></inlineequation>),
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an eye coordinate distance,
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a valid bit,
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and associated color data and texture coordinates.
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The
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<inlineequation><mml:math><mml:mi mathvariant="italic">w</mml:mi></mml:math></inlineequation>
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coordinate is a clip coordinate,
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because
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<inlineequation><mml:math><mml:mi mathvariant="italic">w</mml:mi></mml:math></inlineequation>
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is not projected to window coordinates.
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<function>glRasterPos4</function> specifies object coordinates
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<inlineequation><mml:math><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>,
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<inlineequation><mml:math><mml:mi mathvariant="italic">y</mml:mi></mml:math></inlineequation>,
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<inlineequation><mml:math><mml:mi mathvariant="italic">z</mml:mi></mml:math></inlineequation>,
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and
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<inlineequation><mml:math><mml:mi mathvariant="italic">w</mml:mi></mml:math></inlineequation>
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explicitly.
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<function>glRasterPos3</function> specifies object coordinate
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<inlineequation><mml:math><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>,
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<inlineequation><mml:math><mml:mi mathvariant="italic">y</mml:mi></mml:math></inlineequation>,
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and
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<inlineequation><mml:math><mml:mi mathvariant="italic">z</mml:mi></mml:math></inlineequation>
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explicitly,
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while
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<inlineequation><mml:math><mml:mi mathvariant="italic">w</mml:mi></mml:math></inlineequation>
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is implicitly set to 1.
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<function>glRasterPos2</function> uses the argument values for
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<inlineequation><mml:math><mml:mi mathvariant="italic">x</mml:mi></mml:math></inlineequation>
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and
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<inlineequation><mml:math><mml:mi mathvariant="italic">y</mml:mi></mml:math></inlineequation>
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while
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implicitly setting
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<inlineequation><mml:math><mml:mi mathvariant="italic">z</mml:mi></mml:math></inlineequation>
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and
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<inlineequation><mml:math><mml:mi mathvariant="italic">w</mml:mi></mml:math></inlineequation>
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to 0 and 1.
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</para>
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<para>
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The object coordinates presented by <function>glRasterPos</function> are treated just like those
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of a <citerefentry><refentrytitle>glVertex</refentrytitle></citerefentry> command:
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They are transformed by the current modelview and projection matrices
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and passed to the clipping stage.
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If the vertex is not culled,
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then it is projected and scaled to window coordinates,
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which become the new current raster position,
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and the <constant>GL_CURRENT_RASTER_POSITION_VALID</constant> flag is set.
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If the vertex
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<emphasis>is</emphasis>
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culled,
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then the valid bit is cleared and the current raster position
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and associated color and texture coordinates are undefined.
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</para>
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<para>
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The current raster position also includes some associated color data
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and texture coordinates.
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If lighting is enabled,
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then <constant>GL_CURRENT_RASTER_COLOR</constant>
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(in RGBA mode)
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or <constant>GL_CURRENT_RASTER_INDEX</constant>
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(in color index mode)
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is set to the color produced by the lighting calculation
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(see <citerefentry><refentrytitle>glLight</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glLightModel</refentrytitle></citerefentry>, and
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<citerefentry><refentrytitle>glShadeModel</refentrytitle></citerefentry>).
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If lighting is disabled,
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current color
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(in RGBA mode, state variable <constant>GL_CURRENT_COLOR</constant>)
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or color index
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(in color index mode, state variable <constant>GL_CURRENT_INDEX</constant>)
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is used to update the current raster color.
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<constant>GL_CURRENT_RASTER_SECONDARY_COLOR</constant> (in RGBA mode) is likewise updated.
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
Likewise,
|
||
|
|
<constant>GL_CURRENT_RASTER_TEXTURE_COORDS</constant> is updated as a function
|
||
|
|
of <constant>GL_CURRENT_TEXTURE_COORDS</constant>,
|
||
|
|
based on the texture matrix and the texture generation functions
|
||
|
|
(see <citerefentry><refentrytitle>glTexGen</refentrytitle></citerefentry>).
|
||
|
|
Finally,
|
||
|
|
the distance from the origin of the eye coordinate system to the
|
||
|
|
vertex as transformed by only the modelview matrix replaces
|
||
|
|
<constant>GL_CURRENT_RASTER_DISTANCE</constant>.
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
Initially, the current raster position is (0, 0, 0, 1),
|
||
|
|
the current raster distance is 0,
|
||
|
|
the valid bit is set,
|
||
|
|
the associated RGBA color is (1, 1, 1, 1),
|
||
|
|
the associated color index is 1,
|
||
|
|
and the associated texture coordinates are (0, 0, 0, 1).
|
||
|
|
In RGBA mode,
|
||
|
|
<constant>GL_CURRENT_RASTER_INDEX</constant> is always 1;
|
||
|
|
in color index mode,
|
||
|
|
the current raster RGBA color always maintains its initial value.
|
||
|
|
</para>
|
||
|
|
</refsect1>
|
||
|
|
<refsect1 id="notes"><title>Notes</title>
|
||
|
|
<para>
|
||
|
|
The raster position is modified by <function>glRasterPos</function>, <citerefentry><refentrytitle>glBitmap</refentrytitle></citerefentry>, and <citerefentry><refentrytitle>glWindowPos</refentrytitle></citerefentry>.
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
When the raster position coordinates are invalid,
|
||
|
|
drawing commands that are based on the raster position are
|
||
|
|
ignored (that is, they do not result in changes to GL state).
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
Calling <citerefentry><refentrytitle>glDrawElements</refentrytitle></citerefentry> or <citerefentry><refentrytitle>glDrawRangeElements</refentrytitle></citerefentry> may leave the
|
||
|
|
current color or index indeterminate.
|
||
|
|
If <function>glRasterPos</function> is executed while the current color or index is indeterminate, the
|
||
|
|
current raster color or current raster index remains indeterminate.
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
To set a valid raster position outside the viewport, first set a valid
|
||
|
|
raster position, then call <citerefentry><refentrytitle>glBitmap</refentrytitle></citerefentry> with NULL as the <emphasis>bitmap</emphasis>
|
||
|
|
parameter.
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
When the <code>ARB_imaging</code> extension is supported, there are distinct
|
||
|
|
raster texture coordinates for each texture unit. Each texture unit's
|
||
|
|
current raster texture coordinates are updated by <function>glRasterPos</function>.
|
||
|
|
</para>
|
||
|
|
</refsect1>
|
||
|
|
<refsect1 id="errors"><title>Errors</title>
|
||
|
|
<para>
|
||
|
|
<constant>GL_INVALID_OPERATION</constant> is generated if <function>glRasterPos</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>glGet</refentrytitle></citerefentry> with argument <constant>GL_CURRENT_RASTER_POSITION</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_CURRENT_RASTER_POSITION_VALID</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_CURRENT_RASTER_DISTANCE</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_CURRENT_RASTER_COLOR</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_CURRENT_RASTER_SECONDARY_COLOR</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_CURRENT_RASTER_INDEX</constant>
|
||
|
|
</para>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_CURRENT_RASTER_TEXTURE_COORDS</constant>
|
||
|
|
</para>
|
||
|
|
</refsect1>
|
||
|
|
<refsect1 id="seealso"><title>See Also</title>
|
||
|
|
<para>
|
||
|
|
<citerefentry><refentrytitle>glBitmap</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glCopyPixels</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glDrawElements</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glDrawRangeElements</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glDrawPixels</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glMultiTexCoord</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glTexCoord</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glTexGen</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glVertex</refentrytitle></citerefentry>,
|
||
|
|
<citerefentry><refentrytitle>glWindowPos</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>
|