NAME

       atomicExchange - perform an atomic exchange operation to a variable

DECLARATION

       int atomicExchange(inout int mem, int data);

       uint atomicExchange(inout uint mem, uint data);

PARAMETERS

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

       data
           The data to be exchanged with mem.

DESCRIPTION

       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.

VERSION SUPPORT

       ┌───────────────┬───────────────────────────────────────────────────────────────────────────────────┐
       │               │        OpenGL Shading Language Version                                            │
       ├───────────────┼──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┤
       │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 │  -   │  -   │  -   │  -   │  -   │  -   │  -   │  -   │  -   │  ✔   │  ✔   │  ✔   │
       └───────────────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┘

SEE ALSO

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

COPYRIGHT

       Copyright © 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.
       http://opencontent.org/openpub/.

COPYRIGHT

       Copyright © 2012-2014 Khronos Group

[FIXME: source]                             01/03/2018                         ATOMICEXCHANGE(3G)