gl_InvocationID — contains the invocation index of the current shader
in int gl_InvocationID;
In the tessellation control language, gl_InvocationID
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.
In the geometry language, gl_InvocationID 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.
| 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_InvocationID | - | - | - | - | Y1 | Y1 | Y | Y |
[1] Versions 1.50 to 3.30 - geometry shaders only.
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/.