atomicMax - perform an atomic max operation to a variable

       Copyright © 2012-2014 Khronos Group

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

intatomicMax(inoutintmem,intdata);uintatomicMax(inoutuintmem,uintdata);

atomicMax performs an atomic comparison of data to the contents of mem, writes the maximum value into mem
       and returns the original contents of mem from before the comparison occured. The contents of the memory
       being updated by the atomic operation are guaranteed not to be modified by any other assignment or atomic
       memory function in any shader invocation between the time the original value is read and the time the new
       value is written.

       Atomic memory functions are supported only for a limited set of variables. A shader will fail to compile
       if the value passed to the mem argument of an atomic memory function does not correspond to a buffer or
       shared variable. It is acceptable to pass an element of an array or a single component of a vector to the
       mem argument of an atomic memory function, as long as the underlying array or vector is a buffer or
       shared variable.

       atomicMax - perform an atomic max operation to a variable

mem
           The variable to use as the target of the operation.

       data
           The data to be compared to mem.

atomicAdd(), atomicAnd(), atomicOr(), atomicXor(), atomicMin(), atomicExchange(), atomicCompSwap()

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