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97 lines
4.3 KiB
XML
97 lines
4.3 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="glGetClipPlane">
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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>glGetClipPlane</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glGetClipPlane</refname>
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<refpurpose>return the coefficients of the specified clipping plane</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>glGetClipPlane</function></funcdef>
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<paramdef>GLenum <parameter>plane</parameter></paramdef>
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<paramdef>GLdouble * <parameter>equation</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>plane</parameter></term>
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<listitem>
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<para>
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Specifies a clipping plane.
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The number of clipping planes depends on the implementation,
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but at least six clipping planes are supported.
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They are identified by symbolic names of the form <constant>GL_CLIP_PLANE</constant>
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<inlineequation><mml:math><mml:mi mathvariant="italic">i</mml:mi></mml:math></inlineequation>
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where i ranges from 0 to the value of <constant>GL_MAX_CLIP_PLANES</constant> - 1.
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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>equation</parameter></term>
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<listitem>
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<para>
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Returns four double-precision values that are the coefficients of the plane equation of <parameter>plane</parameter> in eye coordinates.
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The initial value is (0, 0, 0, 0).
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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>glGetClipPlane</function> returns in <parameter>equation</parameter> the four coefficients of the plane equation
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for <parameter>plane</parameter>.
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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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It is always the case that <constant>GL_CLIP_PLANE</constant>
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<inlineequation><mml:math><mml:mi mathvariant="italic">i</mml:mi></mml:math></inlineequation>
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= <constant>GL_CLIP_PLANE0</constant> +
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<inlineequation><mml:math><mml:mi mathvariant="italic">i</mml:mi></mml:math></inlineequation>.
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</para>
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<para>
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If an error is generated,
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no change is made to the contents of <parameter>equation</parameter>.
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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_ENUM</constant> is generated if <parameter>plane</parameter> is not an accepted value.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <function>glGetClipPlane</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="seealso"><title>See Also</title>
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<para>
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<citerefentry><refentrytitle>glClipPlane</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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