gl_NumWorkGroups - contains the number of workgroups that have been dispatched to a compute shader

       Copyright © 2012-2014 Khronos Group

[FIXME: source]                                    11/18/2024                               GL_NUMWORKGROUPS(3G)

       in uvec3 gl_NumWorkGroups ;.SH "DESCRIPTION"

       In the compute language, gl_NumWorkGroups contains the total number of work groups that will execute the
       compute shader. The components of gl_NumWorkGroups are equal to the num_groups_x, num_groups_y, and
       num_groups_z parameters passed to the glDispatchCompute command.

       gl_NumWorkGroups - contains the number of workgroups that have been dispatched to a compute shader

gl_WorkGroupSize(), gl_WorkGroupID(), gl_LocalInvocationID()

       ┌──────────────────┬───────────────────────────────────────────────────────────────────────────────────┐
       │                  │        OpenGLShadingLanguageVersion                                            │
       ├──────────────────┼──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┤
       │ 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_NumWorkGroups │  -   │  -   │  -   │  -   │  -   │  -   │  -   │  -   │  -   │  ✔   │  ✔   │  ✔   │
       └──────────────────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┘