2011 Khronos Group
gl_InstanceID 3G
gl_InstanceID contains the index of the current primitive in an instanced draw command

## Declaration

`in int gl_InstanceID;`

## Description

`gl_InstanceID` is a vertex language input variable that holds the integer index of the current primitive in an instanced draw command such as `glDrawArraysInstanced`. If the current primitive does not originate from an instanced draw command, the value of `gl_InstanceID` is zero.

## Version Support

Variable | Version 1.10 | Version 1.20 | Version 1.30 | Version 1.40 | Version 1.50 | Version 3.30 | Version 4.00 | Version 4.10
--- | --- | --- | --- | --- | --- | --- | --- | ---
gl_InstanceID | - | - | - | Y | Y | Y | Y | Y

## See Also

gl_VertexID

## Copyright

Copyright 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. http://opencontent.org/openpub/.