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.\"     Title: gl_PrimitiveIDIn
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: 01/03/2018
.\"    Manual: [FIXME: manual]
.\"    Source: [FIXME: source]
.\"  Language: English
.\"
.TH "GL_PRIMITIVEIDIN" "3G" "01/03/2018" "[FIXME: source]" "[FIXME: manual]"
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.SH "NAME"
gl_PrimitiveIDIn \- contains the index of the current primitive
.SH "DECLARATION"
in\ \&int\ \&gl_PrimitiveIDIn\ \&;.SH "DESCRIPTION"
.PP
\fIgl_PrimitiveIDIn\fR
is a geometry language input variable that holds the number of primitives processed by the shader since the current set of rendering primitives was started\&. The first primitive processed by the drawing command is numbered zero and the primitive ID counter is incremented after every individual point, line or triangle primitive is processed\&. For triangles drawn in point or line mode, the primitive ID counter is incremented only once, even through multiple points or lines may actually be drawn\&. Restarting a primitive topology using the primitive restart index has no effect on the primitive ID counter\&.
.SH "VERSION SUPPORT"
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gl_PrimitiveIDIn
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.TE
.sp 1
.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