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1 | <?xml version="1.0" encoding="UTF-8"?> |
2 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd"> | |
3 | <!-- saved from url=(0013)about:internet --> | |
4 | <?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>gl_SampleID - OpenGL Shading Language (GLSL)</title><meta name="generator" content="DocBook XSL Stylesheets V1.69.1" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="gl_SampleID"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>gl_SampleID — contains the index of the sample currently being processed</p></div><div class="refsynopsisdiv"><h2>Declaration</h2><div class="funcsynopsis"><code class="function">in int gl_SampleID;</code></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p> | |
5 | <code class="function">gl_SampleID</code> is a fragment language input variable that contains | |
6 | the index of the sample currently being processed. This variable is in the range | |
7 | 0 to <a href="gl_NumSamples.xml"><span class="citerefentry"><span class="refentrytitle">gl_NumSamples</span></span></a> - 1, where | |
8 | <a href="gl_NumSamples.xml"><span class="citerefentry"><span class="refentrytitle">gl_NumSamples</span></span></a> | |
9 | is the total number of samples in each fragment for the current framebuffer (and thus 1 if | |
10 | rendering to a non-multisample buffer). Any static use of this variable in a fragment | |
11 | shader causes the entire shader to be evaluated per-sample rather than per-fragment. | |
12 | </p><p> | |
13 | When rendering to a non-multisample buffer, or if multisample rasterization is disabled, | |
14 | <code class="function">gl_SampleID</code> will always be zero. <a href="gl_NumSamples.xml"><span class="citerefentry"><span class="refentrytitle">gl_NumSamples</span></span></a> | |
15 | is the sample count of the framebuffer regardless of whether multisample rasterization is | |
16 | enabled or not. | |
17 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="versions"></a><h2>Version Support</h2><div class="informaltable"><table border="1"><colgroup><col align="left" /><col align="center" /><col align="center" /><col align="center" /><col align="center" /><col align="center" /><col align="center" /><col align="center" /><col align="center" /><col align="center" /><col align="center" /></colgroup><thead><tr><th align="left"><span class="bold"><strong>Variable</strong></span></th><th align="left"><span class="bold"><strong>Version 1.10</strong></span></th><th align="left"><span class="bold"><strong>Version 1.20</strong></span></th><th align="left"><span class="bold"><strong>Version 1.30</strong></span></th><th align="left"><span class="bold"><strong>Version 1.40</strong></span></th><th align="left"><span class="bold"><strong>Version 1.50</strong></span></th><th align="left"><span class="bold"><strong>Version 3.30</strong></span></th><th align="left"><span class="bold"><strong>Version 4.00</strong></span></th><th align="left"><span class="bold"><strong>Version 4.10</strong></span></th><th align="left"><span class="bold"><strong>Version 4.20</strong></span></th><th align="center"><span class="bold"><strong>Version 4.30</strong></span></th></tr><tr><th align="left">gl_SampleID</th><th align="center"><span class="emphasis"><em>-</em></span></th><th align="center"><span class="emphasis"><em>-</em></span></th><th align="center"><span class="emphasis"><em>-</em></span></th><th align="center"><span class="emphasis"><em>-</em></span></th><th align="center"><span class="emphasis"><em>-</em></span></th><th align="center"><span class="emphasis"><em>-</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th><th align="center"><span class="emphasis"><em>Y</em></span></th></tr></thead></table></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p> | |
18 | <a href="gl_SamplePosition.xml"><span class="citerefentry"><span class="refentrytitle">gl_SamplePosition</span></span></a>, | |
19 | <a href="gl_NumSamples.xml"><span class="citerefentry"><span class="refentrytitle">gl_NumSamples</span></span></a> | |
20 | </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p> | |
21 | Copyright <span class="trademark"></span>© 2011 Khronos Group. | |
22 | This material may be distributed subject to the terms and conditions set forth in | |
23 | the Open Publication License, v 1.0, 8 June 1999. | |
24 | <a href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>. | |
25 | </p></div></div></body></html> |