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>glPassThrough</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glPassThrough"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glPassThrough — place a marker in the feedback buffer</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">glPassThrough</b>(</code></td><td>GLfloat </td><td><var class="pdparam">token</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>token</code></em></span></dt><dd><p> | |
| 4 | Specifies a marker value to be placed in the feedback buffer | |
| 5 | following a <code class="constant">GL_PASS_THROUGH_TOKEN</code>. | |
| 6 | </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p> | |
| 7 | </p><p> | |
| 8 | Feedback is a GL render mode. | |
| 9 | The mode is selected by calling | |
| 10 | <a class="citerefentry" href="glRenderMode.xml"><span class="citerefentry"><span class="refentrytitle">glRenderMode</span></span></a> with <code class="constant">GL_FEEDBACK</code>. | |
| 11 | When the GL is in feedback mode, | |
| 12 | no pixels are produced by rasterization. | |
| 13 | Instead, | |
| 14 | information about primitives that would have been rasterized | |
| 15 | is fed back to the application using the GL. | |
| 16 | See the <a class="citerefentry" href="glFeedbackBuffer.xml"><span class="citerefentry"><span class="refentrytitle">glFeedbackBuffer</span></span></a> reference page for a description of the | |
| 17 | feedback buffer and the values in it. | |
| 18 | </p><p> | |
| 19 | <code class="function">glPassThrough</code> inserts a user-defined marker in the feedback buffer | |
| 20 | when it is executed in feedback mode. | |
| 21 | <em class="parameter"><code>token</code></em> is returned as if it were a primitive; | |
| 22 | it is indicated with its own unique identifying value: | |
| 23 | <code class="constant">GL_PASS_THROUGH_TOKEN</code>. | |
| 24 | The order of <code class="function">glPassThrough</code> commands with respect to the specification | |
| 25 | of graphics primitives is maintained. | |
| 26 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p> | |
| 27 | <code class="function">glPassThrough</code> is ignored if the GL is not in feedback mode. | |
| 28 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p> | |
| 29 | <code class="constant">GL_INVALID_OPERATION</code> is generated if <code class="function">glPassThrough</code> is executed between | |
| 30 | the execution of <a class="citerefentry" href="glBegin.xml"><span class="citerefentry"><span class="refentrytitle">glBegin</span></span></a> and the corresponding execution of <a class="citerefentry" href="glEnd.xml"><span class="citerefentry"><span class="refentrytitle">glEnd</span></span></a>. | |
| 31 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p> | |
| 32 | <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_RENDER_MODE</code> | |
| 33 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p> | |
| 34 | <a class="citerefentry" href="glFeedbackBuffer.xml"><span class="citerefentry"><span class="refentrytitle">glFeedbackBuffer</span></span></a>, | |
| 35 | <a class="citerefentry" href="glRenderMode.xml"><span class="citerefentry"><span class="refentrytitle">glRenderMode</span></span></a> | |
| 36 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> | |
| 37 | Copyright <span class="trademark"></span>© 1991-2006 | |
| 38 | Silicon Graphics, Inc. This document is licensed under the SGI | |
| 39 | Free Software B License. For details, see | |
| 40 | <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>. | |
| 41 | </p></div></div></body></html> |