145 lines
7.2 KiB
XML
145 lines
7.2 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="glPushMatrix">
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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>glPushMatrix</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glPushMatrix</refname>
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<refpurpose>push and pop the current matrix stack</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>glPushMatrix</function></funcdef>
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<paramdef> <parameter>void</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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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>glPopMatrix</function></funcdef>
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<paramdef> <parameter>void</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1 id="description"><title>Description</title>
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<para>
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There is a stack of matrices for each of the matrix modes.
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In <constant>GL_MODELVIEW</constant> mode,
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the stack depth is at least 32.
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In the other modes,
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<constant>GL_COLOR</constant>, <constant>GL_PROJECTION</constant>, and <constant>GL_TEXTURE</constant>,
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the depth is at least 2.
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The current matrix in any mode is the matrix on the top of the stack
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for that mode.
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</para>
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<para>
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<function>glPushMatrix</function> pushes the current matrix stack down by one,
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duplicating the current matrix.
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That is,
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after a <function>glPushMatrix</function> call,
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the matrix on top of the stack is identical to the one below it.
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</para>
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<para>
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<citerefentry><refentrytitle>glPopMatrix</refentrytitle></citerefentry> pops the current matrix stack,
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replacing the current matrix with the one below it on the stack.
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</para>
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<para>
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Initially, each of the stacks contains one matrix, an identity matrix.
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</para>
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<para>
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It is an error to push a full matrix stack
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or to pop a matrix stack that contains only a single matrix.
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In either case, the error flag is set
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and no other change is made to GL state.
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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_STACK_OVERFLOW</constant> is generated if <function>glPushMatrix</function> is called while
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the current matrix stack is full.
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</para>
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<para>
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<constant>GL_STACK_UNDERFLOW</constant> is generated if <citerefentry><refentrytitle>glPopMatrix</refentrytitle></citerefentry> is called while
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the current matrix stack contains only a single matrix.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <function>glPushMatrix</function> or <citerefentry><refentrytitle>glPopMatrix</refentrytitle></citerefentry>
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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_MATRIX_MODE</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_COLOR_MATRIX</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_MODELVIEW_MATRIX</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PROJECTION_MATRIX</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_TEXTURE_MATRIX</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_COLOR_MATRIX_STACK_DEPTH</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_MODELVIEW_STACK_DEPTH</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_PROJECTION_STACK_DEPTH</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_TEXTURE_STACK_DEPTH</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_MAX_MODELVIEW_STACK_DEPTH</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_MAX_PROJECTION_STACK_DEPTH</constant>
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_MAX_TEXTURE_STACK_DEPTH</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>glFrustum</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glLoadIdentity</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glLoadMatrix</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glLoadTransposeMatrix</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glMatrixMode</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glMultMatrix</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glMultTransposeMatrix</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glOrtho</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glRotate</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glScale</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glTranslate</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glViewport</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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