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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd">
<?xml-stylesheet type="text/xsl" href="mathml.xsl"?><html xmlns="http://www.w3.org/1999/xhtml" xmlns:pref="http://www.w3.org/2002/Math/preference" pref:renderer="mathplayer-dl"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><link rel="stylesheet" type="text/css" href="opengl-man.css" /><title>glPolygonMode - OpenGL 4 Reference Pages</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /></head><body><div class="refentry"><a id="glPolygonMode"></a><div class="titlepage"></div><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 border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><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"><a id="parameters"></a><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"><a id="description"></a><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"><a id="examples"></a><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"><a id="notes"></a><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"><a id="errors"></a><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"><a id="associatedgets"></a><h2>Associated Gets</h2><p>
<a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_POLYGON_MODE</code>
</p></div><div class="refsect1"><a id="seealso"></a><h2>See Also</h2><p>
<a class="citerefentry" href="glLineWidth.xml"><span class="citerefentry"><span class="refentrytitle">glLineWidth</span></span></a>,
<a class="citerefentry" href="glPointSize.xml"><span class="citerefentry"><span class="refentrytitle">glPointSize</span></span></a>
</p></div><div class="refsect1"><a id="Copyright"></a><h2>Copyright</h2><p>
Copyright <span class="trademark"></span>© 1991-2006 Silicon Graphics, Inc.
Copyright <span class="trademark"></span>© 2010-2013 Khronos Group.
This document is licensed under the SGI Free Software B License.
For details, see
<a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>.
</p></div></div></body></html>
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