HCoop / clinton / guile-figl.git / blame
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| 7faf1d71 AW |
1 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd"> |
| 2 | <!-- saved from url=(0013)about:internet --> | |
| 3 | <?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" /><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, | |
| 11 | separate triangle, | |
| 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. | |
| 19 | </p><p> | |
| 20 | The vertices of connected triangles and connected quadrilaterals are always | |
| 21 | marked as boundary, | |
| 22 | regardless of the value of the edge flag. | |
| 23 | </p><p> | |
| 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. | |
| 29 | In particular, | |
| 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> |