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+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd">
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+<?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_InvocationID - 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_InvocationID"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>gl_InvocationID — contains the invocation index of the current shader</p></div><div class="refsynopsisdiv"><h2>Declaration</h2><div class="funcsynopsis"><code class="function">in int gl_InvocationID;</code></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p>
+ In the tessellation control language, <code class="function">gl_InvocationID</code>
+ contains the index of the output patch vertex assigned to the shader invocation.
+ It is assigned an integer value in the range [0, N-1] where N is the number of output
+ patch vertices.
+ </p><p>
+ In the geometry language, <code class="function">gl_InvocationID</code> identifies
+ the invocation number assigned to the geometry shader invocation. It is assigned
+ an integer value in the range [0, N-1] where N is the number of geometry shader
+ invocations per primitive.
+ </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" /></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></tr><tr><th align="left">
+ gl_InvocationID
+ </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><sup>1</sup>
+ </th><th align="center">
+ <span class="emphasis"><em>Y</em></span><sup>1</sup>
+ </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><p>[1] Versions 1.50 to 3.30 - geometry shaders only.</p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>
+ <a href="gl_InstanceID.xml"><span class="citerefentry"><span class="refentrytitle">gl_InstanceID</span></span></a>
+ </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p>
+ Copyright <span class="trademark"></span>© 2011 Khronos Group.
+ This material may be distributed subject to the terms and conditions set forth in
+ the Open Publication License, v 1.0, 8 June 1999.
+ <a href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>.
+ </p></div></div></body></html>