Function AccessScopeByAccess

layers/sync/sync_barrier.cpp:53–69

}

static SyncAccessFlags AccessScopeByAccess(VkAccessFlags2 accesses) {
    SyncAccessFlags sync_accesses = AccessScopeImpl(ExpandAccessFlags(accesses), syncAccessMaskByAccessBit());

    // The above access expansion replaces SHADER_READ meta access with atomic accesses as defined by the specification.
    // ACCELERATION_STRUCTURE_BUILD and MICROMAP_BUILD stages are special in a way that they use SHADER_READ access directly.
    // It is an implementation detail of how SHADER_READ is used by the driver, and we cannot make assumption about specific
    // atomic accesses. If we make such assumption then it can be a problem when after applying synchronization we won't be
    // able to get full SHADER_READ access back, but only a subset of accesses, for example, only SHADER_STORAGE_READ.
    // It would mean we made (incorrect) assumption how the driver represents SHADER_READ in the context of AS build.
    //
    // Handle special cases that use non-expanded meta accesses.
    if (accesses & VK_ACCESS_2_SHADER_READ_BIT) {
        sync_accesses |= SYNC_ACCELERATION_STRUCTURE_BUILD_SHADER_READ_BIT;
        sync_accesses |= SYNC_MICROMAP_BUILD_EXT_SHADER_READ_BIT;
    }
    return sync_accesses;
}

static SyncAccessFlags AccessScope(const SyncAccessFlags& stage_scope, VkAccessFlags2 accesses) {
    SyncAccessFlags access_scope = stage_scope & AccessScopeByAccess(accesses);