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.\"     Title: gl_InvocationID
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: 05/21/2015
.\"    Manual: [FIXME: manual]
.\"    Source: [FIXME: source]
.\"  Language: English
.\"
.TH "GL_INVOCATIONID" "3G" "05/21/2015" "[FIXME: source]" "[FIXME: manual]"
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.SH "NAME"
gl_InvocationID \- contains the invocation index of the current shader
.SH "DECLARATION"
in\ \&int\ \&gl_InvocationID\ \&;.SH "DESCRIPTION"
.PP
In the tessellation control language,
\fIgl_InvocationID\fR
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\&.
.PP
In the geometry language,
\fIgl_InvocationID\fR
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\&.
.SH "VERSION SUPPORT"
.TS
allbox tab(:);
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lB cB cB cB cB cB cB cB cB cB cB cB cB.
T{

T}:T{
\fBOpenGL Shading Language Version\fR
T}
T{
\fBVariable Name\fR
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\fB1\&.10\fR
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\fB1\&.20\fR
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\fB1\&.30\fR
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\fB1\&.40\fR
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\fB1\&.50\fR
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\fB3\&.30\fR
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\fB4\&.00\fR
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\fB4\&.10\fR
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\fB4\&.20\fR
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\fB4\&.30\fR
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\fB4\&.40\fR
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\fB4\&.50\fR
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gl_InvocationID
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\-
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\-
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\-
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\-
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✔
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✔
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.TE
.PP
[1] Versions 1\&.50 to 3\&.30 \- geometry shaders only\&.
.SH "SEE ALSO"
.PP
\fBgl_InstanceID\fR()
.SH "COPYRIGHT"
.PP
Copyright
\(co
2011\-2014 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\&.
\m[blue]\fBhttp://opencontent\&.org/openpub/\fR\m[]\&.
.SH "COPYRIGHT"
.br
Copyright \(co 2011-2014 Khronos Group
.br