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><head><title>glEdgeFlag</title><link rel="stylesheet" href="style.css" type="text/css"/><meta name="generator" content="DocBook XSL Stylesheets V1.59.1"/><link rel="home" href="index.xml" title="PyOpenGL 2.0.1.07 Man Pages"/><link rel="up" href="reference-GL.xml" title="GL"/><link rel="previous" href="glDrawRangeElements.3G.xml" title="glDrawRangeElements"/><link rel="next" href="glEdgeFlagPointer.3G.xml" title="glEdgeFlagPointer"/></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">glEdgeFlag</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="glDrawRangeElements.3G.xml">Prev</a></td><th width="60%" align="center">GL</th><td width="20%" align="right"><a accesskey="n" href="glEdgeFlagPointer.3G.xml">Next</a></td></tr></table><hr/></div><div class="refentry" lang="en"><a name="glEdgeFlag.3G"/><div class="titlepage"/><div class="refnamediv"><a name="glEdgeFlag.3G-name"/><h2>Name</h2><p>glEdgeFlag, glEdgeFlagv — flag edges as either boundary or nonboundary</p></div><div class="refsynopsisdiv"><a name="glEdgeFlag.3G-c_spec"/><h2>C Specification</h2><table class="funcprototype" border="0" cellpadding="0" cellspacing="0"><tr><td valign="top"><code>void<tt>glEdgeFlag</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code>GLboolean<i><tt>flag</tt></i>);</code></td></tr></table></div><div class="refsynopsisdiv"><a name="glEdgeFlag.3G-python_spec"/><h2>Python Specification</h2><table class="funcprototype" border="0" cellpadding="0" cellspacing="0"><tr><td valign="top"><code><tt>glEdgeFlag</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code><i><tt>flag</tt></i>) →<tt>None</tt></code></td></tr></table></div><div class="refsect1" lang="en"><a name="glEdgeFlag.3G-parameters"/><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><i><tt>flag</tt></i></span></dt><dd>
Specifies the current edge flag value, either <tt>GL_TRUE</tt> or
<tt>GL_FALSE</tt>. The initial value is <tt>GL_TRUE</tt>.
</dd></dl></div></div><div class="refsynopsisdiv"><a name="glEdgeFlag.3G-c_spec-v"/><h2>C Specification</h2><table class="funcprototype" border="0" cellpadding="0" cellspacing="0"><tr><td valign="top"><code>void<tt>glEdgeFlagv</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code>constGLboolean*<i><tt>flag</tt></i>);</code></td></tr></table></div><div class="refsynopsisdiv"><a name="glEdgeFlag.3G-python_spec-v"/><h2>Python Specification</h2><table class="funcprototype" border="0" cellpadding="0" cellspacing="0"><tr><td valign="top"><code><tt>glEdgeFlagv</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code><i><tt>flag</tt></i>) →<tt>None</tt></code></td></tr></table></div><div class="refsect1" lang="en"><a name="glEdgeFlag.3G-parameters-v"/><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><i><tt>flag</tt></i></span></dt><dd>
Specifies a pointer to an array that contains a single boolean element, which replaces the current edge
flag value.
</dd></dl></div></div><div class="refsect1" lang="en"><a name="glEdgeFlag.3G-description"/><h2>Description</h2><p>
Each vertex of a polygon, separate triangle, or separate quadrilateral specified between a <a href="glBegin.3G.xml"><tt>glBegin</tt></a>/<a href="glBegin.3G.xml"><tt>glEnd</tt></a> pair is marked as the start of
either a boundary or nonboundary edge. If the current edge flag is true when the vertex is specified, the vertex is
marked as the start of a boundary edge. Otherwise, the vertex is marked as the start of a nonboundary edge.
<tt>glEdgeFlag</tt> sets the edge flag bit to <tt>GL_TRUE</tt> if <i><tt>flag</tt></i>
is <tt>GL_TRUE</tt>, and to <tt>GL_FALSE</tt> otherwise.
</p><p>
The vertices of connected triangles and connected quadrilaterals are always marked as boundary, regardless of the value
of the edge flag.
</p><p>
Boundary and nonboundary edge flags on vertices are significant only if <tt>GL_POLYGON_MODE</tt> is set to
<tt>GL_POINT</tt> or <tt>GL_LINE</tt>. See <a href="glPolygonMode.3G.xml"><tt>glPolygonMode</tt></a>.
</p></div><div class="refsect1" lang="en"><a name="glEdgeFlag.3G-notes"/><h2>Notes</h2><p>
The current edge flag can be updated at any time. In particular, <tt>glEdgeFlag</tt> can be called between
a call to <a href="glBegin.3G.xml"><tt>glBegin</tt></a> and the corresponding call to <a href="glBegin.3G.xml"><tt>glEnd</tt></a>.
</p></div><div class="refsect1" lang="en"><a name="glEdgeFlag.3G-associated_gets"/><h2>Associated Gets</h2><p>
<tt>glGet</tt> with argument <tt>GL_EDGE_FLAG</tt>
</p></div><div class="refsect1" lang="en"><a name="glEdgeFlag.3G-see_also"/><h2>See Also</h2><p>
<span class="simplelist"><a href="glBegin.3G.xml">glBegin</a>, <a href="glEdgeFlagPointer.3G.xml">glEdgeFlagPointer</a>, <a href="glPolygonMode.3G.xml">glPolygonMode</a></span>
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