void UpdateChangeParents()
{
if (m_ExistingParentsGroup.IsEmptyIgnoreFilter)
{
return;
}
var count = m_ExistingParentsGroup.CalculateEntityCount();
if (count == 0)
{
return;
}
// 1. Get (Parent,Child) to remove
// 2. Get (Parent,Child) to add
// 3. Get unique Parent change list
// 4. Set PreviousParent to new Parent
var parentChildrenToAdd = new NativeMultiHashMap <Entity, Entity>(count, Allocator.TempJob);
var parentChildrenToRemove = new NativeMultiHashMap <Entity, Entity>(count, Allocator.TempJob);
var uniqueParents = new NativeHashMap <Entity, int>(count, Allocator.TempJob);
var gatherChangedParentsJob = new GatherChangedParents
{
ParentChildrenToAdd = parentChildrenToAdd.AsParallelWriter(),
ParentChildrenToRemove = parentChildrenToRemove.AsParallelWriter(),
UniqueParents = uniqueParents.AsParallelWriter(),
PreviousParentType = GetArchetypeChunkComponentType <PreviousParent>(false),
ParentType = GetArchetypeChunkComponentType <Parent>(true),
EntityType = GetArchetypeChunkEntityType(),
LastSystemVersion = LastSystemVersion
};
var gatherChangedParentsJobHandle = gatherChangedParentsJob.Schedule(m_ExistingParentsGroup);
gatherChangedParentsJobHandle.Complete();
// 5. (Structural change) Add any missing Child to Parents
var parentsMissingChild = new NativeList <Entity>(Allocator.TempJob);
var findMissingChildJob = new FindMissingChild
{
UniqueParents = uniqueParents,
ChildFromEntity = GetBufferFromEntity <Child>(),
ParentsMissingChild = parentsMissingChild
};
var findMissingChildJobHandle = findMissingChildJob.Schedule();
findMissingChildJobHandle.Complete();
EntityManager.AddComponent(parentsMissingChild.AsArray(), typeof(Child));
// 6. Get Child[] for each unique Parent
// 7. Update Child[] for each unique Parent
var fixupChangedChildrenJob = new FixupChangedChildren
{
ParentChildrenToAdd = parentChildrenToAdd,
ParentChildrenToRemove = parentChildrenToRemove,
UniqueParents = uniqueParents,
ChildFromEntity = GetBufferFromEntity <Child>()
};
var fixupChangedChildrenJobHandle = fixupChangedChildrenJob.Schedule();
fixupChangedChildrenJobHandle.Complete();
parentChildrenToAdd.Dispose();
parentChildrenToRemove.Dispose();
uniqueParents.Dispose();
parentsMissingChild.Dispose();
}