gl_VertexID - OpenGL ES 3.1 Reference Pages

## Name

gl_VertexID — contains the index of the current vertex

## Declaration

`in highp int gl_VertexID ;`

## Description

`gl_VertexID` is a vertex language input variable that holds an integer index for the vertex. The index is implicitly 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`. For `glDrawElements` forms that take a `basevertex`, `gl_VertexID` will have this value added to the index from the buffer.

## Version Support

| OpenGL ES Shading Language Version
--- | ---
Variable Name | 1.00 | 3.00 | 3.10
gl_VertexID | - | ✔ | ✔

## See Also

gl_InstanceID

## Copyright

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