NAME

       atomicAdd - perform an atomic addition to a variable

DECLARATION

       int atomicAdd(inout int mem, int data);

       uint atomicAdd(inout uint mem, uint data);

PARAMETERS

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

       data
           The data to be added to mem.

DESCRIPTION

       atomicAdd performs an atomic addition of data to the contents of mem and returns the
       original contents of mem from before the addition 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.

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

SEE ALSO

       atomicAnd(), atomicOr(), atomicXor(), atomicMin(), atomicMax(), atomicExchange(),
       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                              ATOMICADD(3G)