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377 lines
20 KiB
XML
377 lines
20 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="glWindowPos">
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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>glWindowPos</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glWindowPos</refname>
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<refpurpose>specify the raster position in window coordinates 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>glWindowPos2s</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>glWindowPos2i</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>glWindowPos2f</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>glWindowPos2d</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>glWindowPos3s</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>glWindowPos3i</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>glWindowPos3f</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>glWindowPos3d</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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</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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<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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coordinates for the raster 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>glWindowPos2sv</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>glWindowPos2iv</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>glWindowPos2fv</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>glWindowPos2dv</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>glWindowPos3sv</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>glWindowPos3iv</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>glWindowPos3fv</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>glWindowPos3dv</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 or three 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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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. This position,
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called the raster position, is used to position pixel and bitmap write
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operations. It is maintained with subpixel accuracy. See <citerefentry><refentrytitle>glBitmap</refentrytitle></citerefentry>,
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<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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<function>glWindowPos2</function> specifies the
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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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coordinates, while
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<inlineequation><mml:math><mml:mi mathvariant="italic">z</mml:mi></mml:math></inlineequation>
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is
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implicitly set to 0. <function>glWindowPos3</function> specifies all three 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 of the current raster position is always set to 1.0.
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</para>
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<para>
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<function>glWindowPos</function> directly updates the
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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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coordinates of the current raster
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position with the values specified. That is, the values are neither
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transformed by the current modelview and projection matrices, nor by
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the viewport-to-window transform. The
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<inlineequation><mml:math><mml:mi mathvariant="italic">z</mml:mi></mml:math></inlineequation>
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coordinate of the current raster
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position is updated in the following manner:
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</para>
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<para>
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<informalequation><mml:math>
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<!-- eqn: z = left{ lpile { n above f above {n + z * (f - n)} } lpile { if z <= 0 above if z >= 1 above {roman otherwise} }:-->
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<mml:mrow>
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<mml:mi mathvariant="italic">z</mml:mi>
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<mml:mo>=</mml:mo>
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<mml:mfenced open="{" close="">
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<mml:mrow>
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<mml:mtable>
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<mml:mtr><mml:mtd>
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<mml:mi mathvariant="italic">n</mml:mi>
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</mml:mtd></mml:mtr>
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<mml:mtr><mml:mtd>
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<mml:mi mathvariant="italic">f</mml:mi>
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</mml:mtd></mml:mtr>
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<mml:mtr><mml:mtd>
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<mml:mfenced open="" close="">
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<mml:mrow>
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<mml:mi mathvariant="italic">n</mml:mi>
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<mml:mo>+</mml:mo>
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<mml:mrow>
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<mml:mi mathvariant="italic">z</mml:mi>
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<mml:mo>×</mml:mo>
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<mml:mfenced open="(" close=")">
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<mml:mrow>
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<mml:mi mathvariant="italic">f</mml:mi>
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<mml:mo>-</mml:mo>
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<mml:mi mathvariant="italic">n</mml:mi>
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</mml:mrow>
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</mml:mfenced>
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</mml:mrow>
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</mml:mrow>
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</mml:mfenced>
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</mml:mtd></mml:mtr>
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</mml:mtable>
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<mml:mo>⁢</mml:mo>
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<mml:mtable>
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<mml:mtr><mml:mtd>
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<mml:mrow>
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<mml:mrow>
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<mml:mi mathvariant="italic">if</mml:mi>
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<mml:mo>⁢</mml:mo>
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<mml:mi mathvariant="italic">z</mml:mi>
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</mml:mrow>
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<mml:mo><=</mml:mo>
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<mml:mn>0</mml:mn>
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</mml:mrow>
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</mml:mtd></mml:mtr>
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<mml:mtr><mml:mtd>
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<mml:mrow>
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<mml:mrow>
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<mml:mi mathvariant="italic">if</mml:mi>
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<mml:mo>⁢</mml:mo>
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<mml:mi mathvariant="italic">z</mml:mi>
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</mml:mrow>
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<mml:mo>>=</mml:mo>
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<mml:mn>1</mml:mn>
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</mml:mrow>
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</mml:mtd></mml:mtr>
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<mml:mtr><mml:mtd>
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<mml:mfenced open="" close="">
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<mml:mi mathvariant="normal">otherwise</mml:mi>
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</mml:mfenced>
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</mml:mtd></mml:mtr>
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</mml:mtable>
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</mml:mrow>
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</mml:mfenced>
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</mml:mrow>
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</mml:math></informalequation>
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</para>
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<para>
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</para>
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<para>
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where
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<inlineequation><mml:math><mml:mi mathvariant="italic">n</mml:mi></mml:math></inlineequation>
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is <constant>GL_DEPTH_RANGE</constant>'s near value, and
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<inlineequation><mml:math><mml:mi mathvariant="italic">f</mml:mi></mml:math></inlineequation>
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is
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<constant>GL_DEPTH_RANGE</constant>'s far value. See <citerefentry><refentrytitle>glDepthRange</refentrytitle></citerefentry>.
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</para>
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<para>
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The specified coordinates are not clip-tested, causing the raster position
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to always be valid.
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</para>
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<para>
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The current raster position also includes some associated color data and
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texture coordinates. If lighting is enabled, then
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<constant>GL_CURRENT_RASTER_COLOR</constant> (in RGBA mode) or <constant>GL_CURRENT_RASTER_INDEX</constant>
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(in color index mode) is set to the color produced by the lighting
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calculation (see <citerefentry><refentrytitle>glLight</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glLightModel</refentrytitle></citerefentry>, and <citerefentry><refentrytitle>glShadeModel</refentrytitle></citerefentry>).
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If lighting is disabled, current color (in RGBA mode, state variable
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<constant>GL_CURRENT_COLOR</constant>) or color index (in color index mode, state variable
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<constant>GL_CURRENT_INDEX</constant>) 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.
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</para>
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<para>
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Likewise, <constant>GL_CURRENT_RASTER_TEXTURE_COORDS</constant> is updated as a function of
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<constant>GL_CURRENT_TEXTURE_COORDS</constant>, based on the texture matrix and the texture
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generation functions (see <citerefentry><refentrytitle>glTexGen</refentrytitle></citerefentry>). The
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<constant>GL_CURRENT_RASTER_DISTANCE</constant> is set to the <constant>GL_CURRENT_FOG_COORD</constant>.
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</para>
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<para>
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</para>
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</refsect1>
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<refsect1 id="notes"><title>Notes</title>
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<para>
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<function>glWindowPos</function> is available only if the GL version is 1.4 or greater.
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</para>
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<para>
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The raster position is modified by <citerefentry><refentrytitle>glRasterPos</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glBitmap</refentrytitle></citerefentry>, and
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<function>glWindowPos</function>.
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</para>
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<para>
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Calling <citerefentry><refentrytitle>glDrawElements</refentrytitle></citerefentry>, or <citerefentry><refentrytitle>glDrawRangeElements</refentrytitle></citerefentry> may leave the
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current color or index indeterminate.
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If <function>glWindowPos</function> is executed while the current color or index is indeterminate, the
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current raster color or current raster index remains indeterminate.
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</para>
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<para>
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There are distinct raster texture coordinates for each texture unit. Each
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texture unit's current raster texture coordinates are updated by <function>glWindowPos</function>.
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</para>
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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_OPERATION</constant> is generated if <function>glWindowPos</function>
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is executed between the execution of <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>
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and the corresponding execution of <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>.
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</para>
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</refsect1>
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<refsect1 id="associatedgets"><title>Associated Gets</title>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_CURRENT_RASTER_POSITION</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_CURRENT_RASTER_POSITION_VALID</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_CURRENT_RASTER_DISTANCE</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_CURRENT_RASTER_COLOR</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_CURRENT_RASTER_SECONDARY_COLOR</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_CURRENT_RASTER_INDEX</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_CURRENT_RASTER_TEXTURE_COORDS</constant>
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</para>
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</refsect1>
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<refsect1 id="seealso"><title>See Also</title>
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<para>
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<citerefentry><refentrytitle>glBitmap</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glCopyPixels</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDrawArrays</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDrawElements</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDrawRangeElements</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glDrawPixels</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glMultiTexCoord</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glRasterPos</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexCoord</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTexGen</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glVertex</refentrytitle></citerefentry>
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</para>
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</refsect1>
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<refsect1 id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"></trademark> 1991-2006
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Silicon Graphics, Inc. This document is licensed under the SGI
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Free Software B License. For details, see
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<ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
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</para>
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</refsect1>
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</refentry>
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