storageBarrier

storageBarrier orders writes to storage buffers (and shared memory): writes the invocation made before the call become visible to other invocations in the workgroup before any write it makes after the call. Unlike barrier, it does not wait for other invocations.

Signature

storageBarrier :: () -> void {...}

storageBarrier is only valid in compute stages. Calling it in a vertex or fragment stage is a compile error.

Example

A fence on its own does not make another invocation wait. To publish data and then read what other invocations wrote, follow the fence with barrier:

compute "Publish" [64, 1, 1] {
    uint i = input.global_id.x;
    resources.results[i] = computeValue(i);

    storageBarrier();  // Order this invocation's buffer writes
    barrier();        // Wait for the rest of the workgroup

    float neighbor = resources.results[i ^ 1u];
}

Compiled Output

See Also

• barrier - Execution barrier for the whole workgroup
• memoryBarrier - Currently the same fence
• Compute Shaders - Shared memory and workgroups