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"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>
5 In the tessellation control language,
<code class=
"function">gl_InvocationID
</code>
6 contains the index of the output patch vertex assigned to the shader invocation.
7 It is assigned an integer value in the range [
0, N-
1] where N is the number of output
10 In the geometry language,
<code class=
"function">gl_InvocationID
</code> identifies
11 the invocation number assigned to the geometry shader invocation. It is assigned
12 an integer value in the range [
0, N-
1] where N is the number of geometry shader
13 invocations per primitive.
14 </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>
16 </strong></span></th><th align=
"left"><span class=
"bold"><strong>
18 </strong></span></th><th align=
"left"><span class=
"bold"><strong>
20 </strong></span></th><th align=
"left"><span class=
"bold"><strong>
22 </strong></span></th><th align=
"left"><span class=
"bold"><strong>
24 </strong></span></th><th align=
"left"><span class=
"bold"><strong>
26 </strong></span></th><th align=
"left"><span class=
"bold"><strong>
28 </strong></span></th><th align=
"left"><span class=
"bold"><strong>
30 </strong></span></th><th align=
"left"><span class=
"bold"><strong>
32 </strong></span></th></tr><tr><th align=
"left">
34 </th><th align=
"center">
35 <span class=
"emphasis"><em>-
</em></span>
36 </th><th align=
"center">
37 <span class=
"emphasis"><em>-
</em></span>
38 </th><th align=
"center">
39 <span class=
"emphasis"><em>-
</em></span>
40 </th><th align=
"center">
41 <span class=
"emphasis"><em>-
</em></span>
42 </th><th align=
"center">
43 <span class=
"emphasis"><em>Y
</em></span><sup>1</sup>
44 </th><th align=
"center">
45 <span class=
"emphasis"><em>Y
</em></span><sup>1</sup>
46 </th><th align=
"center">
47 <span class=
"emphasis"><em>Y
</em></span>
48 </th><th align=
"center">
49 <span class=
"emphasis"><em>Y
</em></span>
50 </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>
51 <a href=
"gl_InstanceID.xml"><span class=
"citerefentry"><span class=
"refentrytitle">gl_InstanceID
</span></span></a>
52 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
53 Copyright
<span class=
"trademark"></span>©
2011 Khronos Group.
54 This material may be distributed subject to the terms and conditions set forth in
55 the Open Publication License, v
1.0,
8 June
1999.
56 <a href=
"http://opencontent.org/openpub/" target=
"_top">http://opencontent.org/openpub/
</a>.
57 </p></div></div></body></html>