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NAME
       gl_InvocationID - contains the invocation index of the current shader


DECLARATION
       in int gl_InvocationID ;.SH "DESCRIPTION"

       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.


VERSION SUPPORT
       ┌────────────────┬───────────────────────────────────────────────────────────────────────────────────┐
       │                │        OpenGL Shading Language Version                                            │
       ├────────────────┼──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┤
       │Variable        │ 1.10 │ 1.20 │ 1.30 │ 1.40 │ 1.50 │ 3.30 │ 4.00 │ 4.10 │ 4.20 │ 4.30 │ 4.40 │ 4.50 │
       │Name            │      │      │      │      │      │      │      │      │      │      │      │      │
       ├────────────────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┤
       │gl_InvocationID │  -   │  -   │  -   │  -   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │
       └────────────────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┘
       [1] Versions 1.50 to 3.30 - geometry shaders only.


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/.


COPYRIGHT
       Copyright © 2011-2014 Khronos Group

[FIXME: source]                             07/22/2015                        GL_INVOCATIONID(3G)