GL_INVOCATIONID(3G)             [FIXME: manual]            GL_INVOCATIONID(3G)

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 Name   | 1.10 | 1.20 | 1.30 | 1.40 | 1.50 | 3.30 | 4.00 | 4.10 | 4.20 | 4.30 | 4.40 | 4.50 |
       +----------------+------+------+------+------+------+------+------+------+------+------+------+------+
       |gl_InvocationID |  -   |  -   |  -   |  -   | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  | <?>  |
       +----------------+------+------+------+------+------+------+------+------+------+------+------+------+

       [1] Versions 1.50 to 3.30 - geometry shaders only.

SEE ALSO
       gl_InstanceID()

COPYRIGHT
       Copyright (C) 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.  https://opencontent.org/openpub/.

COPYRIGHT
       Copyright (C) 2011-2014 Khronos Group

[FIXME: source]                   06/13/2025               GL_INVOCATIONID(3G)