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113 lines
5 KiB
XML
113 lines
5 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="glEdgeFlag">
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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>glEdgeFlag</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glEdgeFlag</refname>
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<refpurpose>flag edges as either boundary or nonboundary</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>glEdgeFlag</function></funcdef>
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<paramdef>GLboolean <parameter>flag</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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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>flag</parameter></term>
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<listitem>
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<para>
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Specifies the current edge flag value,
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either <constant>GL_TRUE</constant> or <constant>GL_FALSE</constant>. The initial value is <constant>GL_TRUE</constant>.
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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>glEdgeFlagv</function></funcdef>
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<paramdef>const GLboolean * <parameter>flag</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>flag</parameter></term>
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<listitem>
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<para>
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Specifies a pointer to an array that contains a single boolean element,
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which replaces the current edge flag value.
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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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Each vertex of a polygon,
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separate triangle,
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or separate quadrilateral specified between a <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>/<citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry> pair
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is marked as the start of either a boundary or nonboundary edge.
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If the current edge flag is true when the vertex is specified,
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the vertex is marked as the start of a boundary edge.
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Otherwise, the vertex is marked as the start of a nonboundary edge.
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<function>glEdgeFlag</function> sets the edge flag bit to <constant>GL_TRUE</constant> if <parameter>flag</parameter> is <constant>GL_TRUE</constant>
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and to <constant>GL_FALSE</constant> otherwise.
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</para>
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<para>
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The vertices of connected triangles and connected quadrilaterals are always
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marked as boundary,
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regardless of the value of the edge flag.
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</para>
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<para>
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Boundary and nonboundary edge flags on vertices are significant only if
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<constant>GL_POLYGON_MODE</constant> is set to <constant>GL_POINT</constant> or <constant>GL_LINE</constant>.
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See <citerefentry><refentrytitle>glPolygonMode</refentrytitle></citerefentry>.
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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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The current edge flag can be updated at any time.
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In particular,
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<function>glEdgeFlag</function> can be called between a call to <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry> and the corresponding
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call to <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_EDGE_FLAG</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>glBegin</refentrytitle></citerefentry>,
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<function>glEdgeFlagPointer</function>,
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<citerefentry><refentrytitle>glPolygonMode</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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