Controls the ordering of memory transactions issued by a single shader invocation.
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).
imageLoad , imageStore , imageAtomicAdd , imageAtomicMin , imageAtomicMax , imageAtomicXor , imageAtomicOr , imageAtomicAnd , imageAtomicExchange , imageAtomicCompSwap , groupMemoryBarrier , memoryBarrierImage , memoryBarrierBuffer , memoryBarrierShared
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