atomicExchange - perform an atomic exchange operation to a variable

       Copyright © 2012-2014 Khronos Group

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

intatomicExchange(inoutintmem,intdata);uintatomicExchange(inoutuintmem,uintdata);

atomicExchange performs an atomic exhange of data with the contents of mem. The content of data is
       written into mem and the original contents of mem are returned. 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.

       atomicExchange - perform an atomic exchange operation to a variable

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

       data
           The data to be exchanged with mem.

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

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       │                │        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           │      │      │      │      │      │      │      │      │      │      │      │      │
       ├────────────────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┤
       │ atomicExchange │  -   │  -   │  -   │  -   │  -   │  -   │  -   │  -   │  -   │  ✔   │  ✔   │  ✔   │
       └────────────────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┘