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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml">
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<title>glPolygonMode - OpenGL 4 Reference Pages</title>
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<header/>
<div class="refentry" id="glPolygonMode">
<div class="titlepage"/>
<div class="refnamediv">
<h2>Name</h2>
<p>glPolygonMode — select a polygon rasterization mode</p>
</div>
<div class="refsynopsisdiv">
<h2>C Specification</h2>
<div class="funcsynopsis">
<table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">
<tr>
<td>
<code class="funcdef">void <strong class="fsfunc">glPolygonMode</strong>(</code>
</td>
<td>GLenum <var class="pdparam">face</var>, </td>
</tr>
<tr>
<td> </td>
<td>GLenum <var class="pdparam">mode</var><code>)</code>;</td>
</tr>
</table>
<div class="funcprototype-spacer"> </div>
</div>
</div>
<div class="refsect1" id="parameters">
<h2>Parameters</h2>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
<em class="parameter">
<code>face</code>
</em>
</span>
</dt>
<dd>
<p>
Specifies the polygons that <em class="parameter"><code>mode</code></em> applies to.
Must be <code class="constant">GL_FRONT_AND_BACK</code> for front- and back-facing polygons.
</p>
</dd>
<dt>
<span class="term">
<em class="parameter">
<code>mode</code>
</em>
</span>
</dt>
<dd>
<p>
Specifies how polygons will be rasterized.
Accepted values are
<code class="constant">GL_POINT</code>,
<code class="constant">GL_LINE</code>, and
<code class="constant">GL_FILL</code>.
The initial value is <code class="constant">GL_FILL</code> for both front- and back-facing polygons.
</p>
</dd>
</dl>
</div>
</div>
<div class="refsect1" id="description">
<h2>Description</h2>
<p>
<code class="function">glPolygonMode</code> controls the interpretation of polygons for rasterization.
<em class="parameter"><code>face</code></em> describes which polygons <em class="parameter"><code>mode</code></em> applies to:
both front and back-facing polygons (<code class="constant">GL_FRONT_AND_BACK</code>).
The polygon mode affects only the final rasterization of polygons.
In particular,
a polygon's vertices are lit and
the polygon is clipped and possibly culled before these modes are applied.
</p>
<p>
Three modes are defined and can be specified in <em class="parameter"><code>mode</code></em>:
</p>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
<code class="constant">GL_POINT</code>
</span>
</dt>
<dd>
<p>
Polygon vertices that are marked as the start of a boundary edge
are drawn as points.
Point attributes such as
<code class="constant">GL_POINT_SIZE</code> and
<code class="constant">GL_POINT_SMOOTH</code> control
the rasterization of the points.
Polygon rasterization attributes other than <code class="constant">GL_POLYGON_MODE</code> have no effect.
</p>
</dd>
<dt>
<span class="term">
<code class="constant">GL_LINE</code>
</span>
</dt>
<dd>
<p>
Boundary edges of the polygon are drawn as line segments.
Line attributes such as
<code class="constant">GL_LINE_WIDTH</code> and
<code class="constant">GL_LINE_SMOOTH</code> control
the rasterization of the lines.
Polygon rasterization attributes other than <code class="constant">GL_POLYGON_MODE</code> have no effect.
</p>
</dd>
<dt>
<span class="term">
<code class="constant">GL_FILL</code>
</span>
</dt>
<dd>
<p>
The interior of the polygon is filled.
Polygon attributes such as <code class="constant">GL_POLYGON_SMOOTH</code> control the rasterization of the polygon.
</p>
</dd>
</dl>
</div>
</div>
<div class="refsect1" id="examples">
<h2>Examples</h2>
<p>
To draw a surface with outlined polygons,
call
</p>
<pre class="programlisting">
glPolygonMode(<code class="constant">GL_FRONT_AND_BACK</code>, <code class="constant">GL_LINE</code>);
</pre>
<p>
</p>
</div>
<div class="refsect1" id="notes">
<h2>Notes</h2>
<p>
Vertices are marked as boundary or nonboundary with an edge flag.
Edge flags are generated internally by the GL when it decomposes
triangle stips and fans.
</p>
</div>
<div class="refsect1" id="errors">
<h2>Errors</h2>
<p>
<code class="constant">GL_INVALID_ENUM</code> is generated if either <em class="parameter"><code>face</code></em> or <em class="parameter"><code>mode</code></em> is not
an accepted value.
</p>
</div>
<div class="refsect1" id="associatedgets">
<h2>Associated Gets</h2>
<p>
<a class="citerefentry" href="glGet.xhtml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_POLYGON_MODE</code>
</p>
</div>
<div class="refsect1" id="versions">
<h2>Version Support</h2>
<div class="informaltable">
<table style="border-collapse: collapse; border-top: 2px solid ; border-bottom: 2px solid ; border-left: 2px solid ; border-right: 2px solid ; ">
<colgroup>
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<col style="text-align: center; " class="lastvers"/>
</colgroup>
<thead>
<tr>
<th style="text-align: left; border-right: 2px solid ; ">
</th>
<th style="text-align: center; border-bottom: 2px solid ; " colspan="12">
<span class="bold"><strong>OpenGL Version</strong></span>
</th>
</tr>
<tr>
<th style="text-align: left; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>Function / Feature Name</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>2.0</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>2.1</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>3.0</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>3.1</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>3.2</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>3.3</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.0</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.1</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.2</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.3</strong></span>
</th>
<th style="text-align: center; border-right: 2px solid ; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.4</strong></span>
</th>
<th style="text-align: center; border-bottom: 2px solid ; ">
<span class="bold"><strong>4.5</strong></span>
</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: left; border-right: 2px solid ; ">
<code class="function">glPolygonMode</code>
</td>
<td style="text-align: center; border-right: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; ">✔</td>
<td style="text-align: center; border-right: 2px solid ; ">✔</td>
<td style="text-align: center; ">✔</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="refsect1" id="seealso">
<h2>See Also</h2>
<p>
<a class="citerefentry" href="glLineWidth.xhtml"><span class="citerefentry"><span class="refentrytitle">glLineWidth</span></span></a>,
<a class="citerefentry" href="glPointSize.xhtml"><span class="citerefentry"><span class="refentrytitle">glPointSize</span></span></a>
</p>
</div>
<div class="refsect1" id="Copyright">
<h2>Copyright</h2>
<p>
Copyright <span class="trademark"/>© 1991-2006 Silicon Graphics, Inc.
Copyright <span class="trademark"/>© 2010-2014 Khronos Group.
This document is licensed under the SGI Free Software B License.
For details, see
<a class="link" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>.
</p>
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