NAME

       memoryBarrier - controls the ordering of memory transactions issued by a single shader
       invocation

DECLARATION

       uint memoryBarrier(void);

DESCRIPTION

       memoryBarrier waits on the completion of all memory accesses resulting from the use of
       image variables or atomic counters and then returns with no other effect. When this
       function returns, the results of any memory stores performed using coherent variables
       performed prior to the call will be visible to any future coherent memory access to the
       same addresses from other shader invocations. In particular, the values written this way
       in one shader stage are guaranteed to be visible to coherent memory accesses performed by
       shader invocations in subsequent stages when those invocations were triggered by the
       execution of the original shader invocation (e.g., fragment shader invocations for a
       primitive resulting from a particular geometry shader invocation).

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

SEE ALSO

       imageLoad(), imageStore(), imageAtomicAdd(), imageAtomicMin(), imageAtomicMax(),
       imageAtomicXor(), imageAtomicOr(), imageAtomicAnd(), imageAtomicExchange(),
       imageAtomicCompSwap(), groupMemoryBarrier(), memoryBarrierImage(), memoryBarrierBuffer(),
       memoryBarrierShared()

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 © 2011-2014 Khronos Group

[FIXME: source]                             07/22/2015                          MEMORYBARRIER(3G)