2011 Khronos Group
gl_VertexID 3G
gl_VertexID contains the index of the current vertex

## Declaration

`in int gl_VertexID;`

## Description

`gl_VertexID` is a vertex language input variable that holds an integer index for the vertex. The index is impliclty generated by `glDrawArrays` and other commands that do not reference the content of the `GL_ELEMENT_ARRAY_BUFFER`, or explicitly generated from the content of the `GL_ELEMENT_ARRAY_BUFFER` by commands such as `glDrawElements`.

## 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_VertexID | Y | Y | Y | Y | Y | Y | Y | Y

## See Also

gl_InstanceID

## 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/.