gl_NumSamples - contains the total number of samples in the framebuffer

       Copyright © 2011-2014 Khronos Group

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

       in bool gl_NumSamples ;.SH "DESCRIPTION"

       gl_NumSamples is a fragment language input variable that contains the number of samples in the
       framebuffer, or 1 if rendering to a non-multisample framebuffer.  gl_NumSamples is the sample count of
       the framebuffer regardless of whether multisample rasterization is enabled or not.

       gl_NumSamples - contains the total number of samples in the framebuffer

gl_SamplePosition(), gl_SampleID()

       ┌───────────────┬───────────────────────────────────────────────────────────────────────────────────┐
       │               │        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_NumSamples │  -   │  -   │  -   │  -   │  -   │  -   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │
       └───────────────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┘