--- /dev/null
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
+ "http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
+<refentry id="glScale">
+ <refmeta>
+ <refmetainfo>
+ <copyright>
+ <year>1991-2006</year>
+ <holder>Silicon Graphics, Inc.</holder>
+ </copyright>
+ </refmetainfo>
+ <refentrytitle>glScale</refentrytitle>
+ <manvolnum>3G</manvolnum>
+ </refmeta>
+ <refnamediv>
+ <refname>glScale</refname>
+ <refpurpose>multiply the current matrix by a general scaling matrix</refpurpose>
+ </refnamediv>
+ <refsynopsisdiv><title>C Specification</title>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>void <function>glScaled</function></funcdef>
+ <paramdef>GLdouble <parameter>x</parameter></paramdef>
+ <paramdef>GLdouble <parameter>y</parameter></paramdef>
+ <paramdef>GLdouble <parameter>z</parameter></paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ <funcsynopsis>
+ <funcprototype>
+ <funcdef>void <function>glScalef</function></funcdef>
+ <paramdef>GLfloat <parameter>x</parameter></paramdef>
+ <paramdef>GLfloat <parameter>y</parameter></paramdef>
+ <paramdef>GLfloat <parameter>z</parameter></paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ </refsynopsisdiv>
+ <!-- eqn: ignoring delim $$ -->
+ <refsect1 id="parameters"><title>Parameters</title>
+ <variablelist>
+ <varlistentry>
+ <term><parameter>x</parameter></term>
+ <term><parameter>y</parameter></term>
+ <term><parameter>z</parameter></term>
+ <listitem>
+ <para>
+ Specify scale factors along the <emphasis>x</emphasis>, <emphasis>y</emphasis>, and <emphasis>z</emphasis> axes, respectively.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+ <refsect1 id="description"><title>Description</title>
+ <para>
+ <function>glScale</function> produces a nonuniform scaling along the <emphasis>x</emphasis>, <emphasis>y</emphasis>, and
+ <emphasis>z</emphasis> axes.
+ The three parameters indicate the desired scale factor along
+ each of the three axes.
+ </para>
+ <para>
+ The current matrix
+ (see <citerefentry><refentrytitle>glMatrixMode</refentrytitle></citerefentry>)
+ is multiplied by this scale matrix,
+ and the product replaces the current matrix
+ as if <citerefentry><refentrytitle>glMultMatrix</refentrytitle></citerefentry> were called with the following matrix
+ as its argument:
+ </para>
+ <para>
+ <informalequation><mml:math>
+ <!-- eqn: left ( matrix { ccol { x above 0 above 0 above 0 } ccol { 0 above y above 0 above 0 } ccol { 0 above 0 above z above 0 } ccol { 0 above 0 above 0 above 1} } right ):-->
+ <mml:mfenced open="(" close=")">
+ <mml:mtable>
+ <mml:mtr>
+ <mml:mtd>
+ <mml:mi mathvariant="italic">x</mml:mi>
+ </mml:mtd>
+ <mml:mtd>
+ <mml:mn>0</mml:mn>
+ </mml:mtd>
+ <mml:mtd>
+ <mml:mn>0</mml:mn>
+ </mml:mtd>
+ <mml:mtd>
+ <mml:mn>0</mml:mn>
+ </mml:mtd>
+ </mml:mtr>
+ <mml:mtr>
+ <mml:mtd>
+ <mml:mn>0</mml:mn>
+ </mml:mtd>
+ <mml:mtd>
+ <mml:mi mathvariant="italic">y</mml:mi>
+ </mml:mtd>
+ <mml:mtd>
+ <mml:mn>0</mml:mn>
+ </mml:mtd>
+ <mml:mtd>
+ <mml:mn>0</mml:mn>
+ </mml:mtd>
+ </mml:mtr>
+ <mml:mtr>
+ <mml:mtd>
+ <mml:mn>0</mml:mn>
+ </mml:mtd>
+ <mml:mtd>
+ <mml:mn>0</mml:mn>
+ </mml:mtd>
+ <mml:mtd>
+ <mml:mi mathvariant="italic">z</mml:mi>
+ </mml:mtd>
+ <mml:mtd>
+ <mml:mn>0</mml:mn>
+ </mml:mtd>
+ </mml:mtr>
+ <mml:mtr>
+ <mml:mtd>
+ <mml:mn>0</mml:mn>
+ </mml:mtd>
+ <mml:mtd>
+ <mml:mn>0</mml:mn>
+ </mml:mtd>
+ <mml:mtd>
+ <mml:mn>0</mml:mn>
+ </mml:mtd>
+ <mml:mtd>
+ <mml:mn>1</mml:mn>
+ </mml:mtd>
+ </mml:mtr>
+ </mml:mtable>
+ </mml:mfenced>
+ </mml:math></informalequation>
+ </para>
+ <para>
+ If the matrix mode is either <constant>GL_MODELVIEW</constant> or <constant>GL_PROJECTION</constant>,
+ all objects drawn after <function>glScale</function> is called are scaled.
+ </para>
+ <para>
+ Use <citerefentry><refentrytitle>glPushMatrix</refentrytitle></citerefentry> and <citerefentry><refentrytitle>glPopMatrix</refentrytitle></citerefentry> to save and restore
+ the unscaled coordinate
+ system.
+ </para>
+ </refsect1>
+ <refsect1 id="notes"><title>Notes</title>
+ <para>
+ If scale factors other than 1 are applied to the modelview matrix
+ and lighting is enabled, lighting often appears wrong.
+ In that case, enable automatic normalization of normals by
+ calling <citerefentry><refentrytitle>glEnable</refentrytitle></citerefentry> with the argument <constant>GL_NORMALIZE</constant>.
+ </para>
+ </refsect1>
+ <refsect1 id="errors"><title>Errors</title>
+ <para>
+ <constant>GL_INVALID_OPERATION</constant> is generated if <function>glScale</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_MATRIX_MODE</constant>
+ </para>
+ <para>
+ <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_COLOR_MATRIX</constant>
+ </para>
+ <para>
+ <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_MODELVIEW_MATRIX</constant>
+ </para>
+ <para>
+ <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PROJECTION_MATRIX</constant>
+ </para>
+ <para>
+ <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_TEXTURE_MATRIX</constant>
+ </para>
+ </refsect1>
+ <refsect1 id="seealso"><title>See Also</title>
+ <para>
+ <citerefentry><refentrytitle>glMatrixMode</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>glMultMatrix</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>glPushMatrix</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>glRotate</refentrytitle></citerefentry>,
+ <citerefentry><refentrytitle>glTranslate</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>
HCoop / clinton / guile-figl.git / blobdiff