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1 | <?xml version="1.0" encoding="UTF-8"?> |
2 | <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN" | |
3 | "http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd"> | |
4 | <refentry id="glEdgeFlag"> | |
5 | <refmeta> | |
6 | <refmetainfo> | |
7 | <copyright> | |
8 | <year>1991-2006</year> | |
9 | <holder>Silicon Graphics, Inc.</holder> | |
10 | </copyright> | |
11 | </refmetainfo> | |
12 | <refentrytitle>glEdgeFlag</refentrytitle> | |
13 | <manvolnum>3G</manvolnum> | |
14 | </refmeta> | |
15 | <refnamediv> | |
16 | <refname>glEdgeFlag</refname> | |
17 | <refpurpose>flag edges as either boundary or nonboundary</refpurpose> | |
18 | </refnamediv> | |
19 | <refsynopsisdiv><title>C Specification</title> | |
20 | <funcsynopsis> | |
21 | <funcprototype> | |
22 | <funcdef>void <function>glEdgeFlag</function></funcdef> | |
23 | <paramdef>GLboolean <parameter>flag</parameter></paramdef> | |
24 | </funcprototype> | |
25 | </funcsynopsis> | |
26 | </refsynopsisdiv> | |
27 | <refsect1 id="parameters"><title>Parameters</title> | |
28 | <variablelist> | |
29 | <varlistentry> | |
30 | <term><parameter>flag</parameter></term> | |
31 | <listitem> | |
32 | <para> | |
33 | Specifies the current edge flag value, | |
34 | either <constant>GL_TRUE</constant> or <constant>GL_FALSE</constant>. The initial value is <constant>GL_TRUE</constant>. | |
35 | </para> | |
36 | </listitem> | |
37 | </varlistentry> | |
38 | </variablelist> | |
39 | </refsect1> | |
40 | <refsynopsisdiv><title>C Specification</title> | |
41 | <funcsynopsis> | |
42 | <funcprototype> | |
43 | <funcdef>void <function>glEdgeFlagv</function></funcdef> | |
44 | <paramdef>const GLboolean * <parameter>flag</parameter></paramdef> | |
45 | </funcprototype> | |
46 | </funcsynopsis> | |
47 | </refsynopsisdiv> | |
48 | <refsect1 id="parameters2"><title>Parameters</title> | |
49 | <variablelist> | |
50 | <varlistentry> | |
51 | <term><parameter>flag</parameter></term> | |
52 | <listitem> | |
53 | <para> | |
54 | Specifies a pointer to an array that contains a single boolean element, | |
55 | which replaces the current edge flag value. | |
56 | </para> | |
57 | </listitem> | |
58 | </varlistentry> | |
59 | </variablelist> | |
60 | </refsect1> | |
61 | <refsect1 id="description"><title>Description</title> | |
62 | <para> | |
63 | Each vertex of a polygon, | |
64 | separate triangle, | |
65 | or separate quadrilateral specified between a <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>/<citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry> pair | |
66 | is marked as the start of either a boundary or nonboundary edge. | |
67 | If the current edge flag is true when the vertex is specified, | |
68 | the vertex is marked as the start of a boundary edge. | |
69 | Otherwise, the vertex is marked as the start of a nonboundary edge. | |
70 | <function>glEdgeFlag</function> sets the edge flag bit to <constant>GL_TRUE</constant> if <parameter>flag</parameter> is <constant>GL_TRUE</constant> | |
71 | and to <constant>GL_FALSE</constant> otherwise. | |
72 | </para> | |
73 | <para> | |
74 | The vertices of connected triangles and connected quadrilaterals are always | |
75 | marked as boundary, | |
76 | regardless of the value of the edge flag. | |
77 | </para> | |
78 | <para> | |
79 | Boundary and nonboundary edge flags on vertices are significant only if | |
80 | <constant>GL_POLYGON_MODE</constant> is set to <constant>GL_POINT</constant> or <constant>GL_LINE</constant>. | |
81 | See <citerefentry><refentrytitle>glPolygonMode</refentrytitle></citerefentry>. | |
82 | </para> | |
83 | </refsect1> | |
84 | <refsect1 id="notes"><title>Notes</title> | |
85 | <para> | |
86 | The current edge flag can be updated at any time. | |
87 | In particular, | |
88 | <function>glEdgeFlag</function> can be called between a call to <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry> and the corresponding | |
89 | call to <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>. | |
90 | </para> | |
91 | </refsect1> | |
92 | <refsect1 id="associatedgets"><title>Associated Gets</title> | |
93 | <para> | |
94 | <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_EDGE_FLAG</constant> | |
95 | </para> | |
96 | </refsect1> | |
97 | <refsect1 id="seealso"><title>See Also</title> | |
98 | <para> | |
99 | <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>, | |
100 | <function>glEdgeFlagPointer</function>, | |
101 | <citerefentry><refentrytitle>glPolygonMode</refentrytitle></citerefentry> | |
102 | </para> | |
103 | </refsect1> | |
104 | <refsect1 id="Copyright"><title>Copyright</title> | |
105 | <para> | |
106 | Copyright <trademark class="copyright"></trademark> 1991-2006 | |
107 | Silicon Graphics, Inc. This document is licensed under the SGI | |
108 | Free Software B License. For details, see | |
109 | <ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>. | |
110 | </para> | |
111 | </refsect1> | |
112 | </refentry> |