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3 <?xml-stylesheet type=
"text/xsl" href=
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renderer=
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"Content-Type" content=
"text/html; charset=UTF-8" /><title>glEdgeFlag
</title><meta name=
"generator" content=
"DocBook XSL Stylesheets V1.73.2" /></head><body><div class=
"refentry" lang=
"en" xml:
lang=
"en"><a id=
"glEdgeFlag"></a><div class=
"titlepage"></div><div class=
"refnamediv"><h2>Name
</h2><p>glEdgeFlag — flag edges as either boundary or nonboundary
</p></div><div class=
"refsynopsisdiv"><h2>C Specification
</h2><div class=
"funcsynopsis"><table border=
"0" summary=
"Function synopsis" cellspacing=
"0" cellpadding=
"0"><tr><td><code class=
"funcdef">void
<b class=
"fsfunc">glEdgeFlag
</b>(
</code></td><td>GLboolean
</td><td><var class=
"pdparam">flag
</var><code>)
</code>;
</td></tr></table></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"parameters"></a><h2>Parameters
</h2><div class=
"variablelist"><dl><dt><span class=
"term"><em class=
"parameter"><code>flag
</code></em></span></dt><dd><p>
4 Specifies the current edge flag value,
5 either
<code class=
"constant">GL_TRUE
</code> or
<code class=
"constant">GL_FALSE
</code>. The initial value is
<code class=
"constant">GL_TRUE
</code>.
6 </p></dd></dl></div></div><div class=
"refsynopsisdiv"><h2>C Specification
</h2><div class=
"funcsynopsis"><table border=
"0" summary=
"Function synopsis" cellspacing=
"0" cellpadding=
"0"><tr><td><code class=
"funcdef">void
<b class=
"fsfunc">glEdgeFlagv
</b>(
</code></td><td>const GLboolean *
</td><td><var class=
"pdparam">flag
</var><code>)
</code>;
</td></tr></table></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"parameters2"></a><h2>Parameters
</h2><div class=
"variablelist"><dl><dt><span class=
"term"><em class=
"parameter"><code>flag
</code></em></span></dt><dd><p>
7 Specifies a pointer to an array that contains a single boolean element,
8 which replaces the current edge flag value.
9 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"description"></a><h2>Description
</h2><p>
10 Each vertex of a polygon,
12 or separate quadrilateral specified between a
<a class=
"citerefentry" href=
"glBegin.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBegin
</span></span></a>/
<a class=
"citerefentry" href=
"glEnd.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glEnd
</span></span></a> pair
13 is marked as the start of either a boundary or nonboundary edge.
14 If the current edge flag is true when the vertex is specified,
15 the vertex is marked as the start of a boundary edge.
16 Otherwise, the vertex is marked as the start of a nonboundary edge.
17 <code class=
"function">glEdgeFlag
</code> sets the edge flag bit to
<code class=
"constant">GL_TRUE
</code> if
<em class=
"parameter"><code>flag
</code></em> is
<code class=
"constant">GL_TRUE
</code>
18 and to
<code class=
"constant">GL_FALSE
</code> otherwise.
20 The vertices of connected triangles and connected quadrilaterals are always
22 regardless of the value of the edge flag.
24 Boundary and nonboundary edge flags on vertices are significant only if
25 <code class=
"constant">GL_POLYGON_MODE
</code> is set to
<code class=
"constant">GL_POINT
</code> or
<code class=
"constant">GL_LINE
</code>.
26 See
<a class=
"citerefentry" href=
"glPolygonMode.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glPolygonMode
</span></span></a>.
27 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"notes"></a><h2>Notes
</h2><p>
28 The current edge flag can be updated at any time.
30 <code class=
"function">glEdgeFlag
</code> can be called between a call to
<a class=
"citerefentry" href=
"glBegin.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBegin
</span></span></a> and the corresponding
31 call to
<a class=
"citerefentry" href=
"glEnd.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glEnd
</span></span></a>.
32 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"associatedgets"></a><h2>Associated Gets
</h2><p>
33 <a class=
"citerefentry" href=
"glGet.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGet
</span></span></a> with argument
<code class=
"constant">GL_EDGE_FLAG
</code>
34 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"seealso"></a><h2>See Also
</h2><p>
35 <a class=
"citerefentry" href=
"glBegin.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBegin
</span></span></a>,
36 <code class=
"function">glEdgeFlagPointer
</code>,
37 <a class=
"citerefentry" href=
"glPolygonMode.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glPolygonMode
</span></span></a>
38 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
39 Copyright
<span class=
"trademark"></span>©
1991-
2006
40 Silicon Graphics, Inc. This document is licensed under the SGI
41 Free Software B License. For details, see
42 <a class=
"ulink" href=
"http://oss.sgi.com/projects/FreeB/" target=
"_top">http://oss.sgi.com/projects/FreeB/
</a>.
43 </p></div></div></body></html>