static Chunk *CloneChunkWithoutAllocatingEntities(EntityManager dstEntityManager, Chunk *srcChunk, ManagedComponentStore srcManagedComponentStore)
{
var dstEntityComponentStore = dstEntityManager.EntityComponentStore;
var dstManagedComponentStore = dstEntityManager.ManagedComponentStore;
// Copy shared component data
var dstSharedIndices = stackalloc int[srcChunk->Archetype->NumSharedComponents];
srcChunk->SharedComponentValues.CopyTo(dstSharedIndices, 0, srcChunk->Archetype->NumSharedComponents);
dstManagedComponentStore.CopySharedComponents(srcManagedComponentStore, dstSharedIndices, srcChunk->Archetype->NumSharedComponents);
// @TODO: Why don't we memcpy the whole chunk. So we include all extra fields???
// Allocate a new chunk
var srcArchetype = srcChunk->Archetype;
var dstArchetype = dstEntityComponentStore->GetOrCreateArchetype(srcArchetype->Types, srcArchetype->TypesCount);
var dstChunk = dstEntityComponentStore->GetCleanChunkNoMetaChunk(dstArchetype, dstSharedIndices);
dstManagedComponentStore.Playback(ref dstEntityComponentStore->ManagedChangesTracker);
dstChunk->metaChunkEntity = srcChunk->metaChunkEntity;
// Release any references obtained by GetCleanChunk & CopySharedComponents
for (var i = 0; i < srcChunk->Archetype->NumSharedComponents; i++)
{
dstManagedComponentStore.RemoveReference(dstSharedIndices[i]);
}
dstEntityComponentStore->SetChunkCountKeepMetaChunk(dstChunk, srcChunk->Count);
dstManagedComponentStore.Playback(ref dstEntityComponentStore->ManagedChangesTracker);
dstChunk->Archetype->EntityCount += srcChunk->Count;
var copySize = Chunk.GetChunkBufferSize();
UnsafeUtility.MemCpy((byte *)dstChunk + Chunk.kBufferOffset, (byte *)srcChunk + Chunk.kBufferOffset, copySize);
// @TODO: Class components should be duplicated instead of copied by ref?
if (dstChunk->ManagedArrayIndex != -1)
{
ManagedComponentStore.CopyManagedObjects(srcManagedComponentStore, srcChunk->Archetype, srcChunk->ManagedArrayIndex, srcChunk->Capacity, 0, dstManagedComponentStore, dstChunk->Archetype, dstChunk->ManagedArrayIndex, dstChunk->Capacity, 0, srcChunk->Count);
}
BufferHeader.PatchAfterCloningChunk(dstChunk);
dstChunk->SequenceNumber = srcChunk->SequenceNumber;
return(dstChunk);
}
static void DestroyBatch(Entity *entities, Chunk *chunk, int indexInChunk, int batchCount,
EntityComponentStore *entityComponentStore,
ManagedComponentStore managedComponentStore)
{
var archetype = chunk->Archetype;
if (!archetype->SystemStateCleanupNeeded)
{
entityComponentStore->DeallocateDataEntitiesInChunk(entities, chunk, indexInChunk, batchCount);
managedComponentStore.IncrementComponentOrderVersion(archetype, chunk->SharedComponentValues);
entityComponentStore->IncrementComponentTypeOrderVersion(archetype);
if (chunk->ManagedArrayIndex >= 0)
{
// We can just chop-off the end, no need to copy anything
if (chunk->Count != indexInChunk + batchCount)
{
managedComponentStore.CopyManagedObjects(chunk, chunk->Count - batchCount, chunk,
indexInChunk, batchCount);
}
managedComponentStore.ClearManagedObjects(chunk, chunk->Count - batchCount,
batchCount);
}
chunk->Archetype->EntityCount -= batchCount;
SetChunkCount(chunk, chunk->Count - batchCount, entityComponentStore, managedComponentStore);
}
else
{
var newType = archetype->SystemStateResidueArchetype;
var sharedComponentValues = chunk->SharedComponentValues;
if (RequiresBuildingResidueSharedComponentIndices(archetype, newType))
{
var tempAlloc = stackalloc int[newType->NumSharedComponents];
BuildResidueSharedComponentIndices(archetype, newType, sharedComponentValues, tempAlloc);
sharedComponentValues = tempAlloc;
}
// See: https://github.com/Unity-Technologies/dots/issues/1387
// For Locked Order Chunks specfically, need to make sure that structural changes are always done per-chunk.
// If trying to muutate structure in a way that is not per chunk, will hit an exception in the else clause anyway.
// This ultimately needs to be replaced by entity batch interface.
if (batchCount == chunk->Count)
{
managedComponentStore.IncrementComponentOrderVersion(archetype, chunk->SharedComponentValues);
entityComponentStore->IncrementComponentTypeOrderVersion(archetype);
EntityManagerChangeArchetypeUtility.SetArchetype(chunk, newType, sharedComponentValues,
entityComponentStore, managedComponentStore);
}
else
{
for (var i = 0; i < batchCount; i++)
{
var entity = entities[i];
managedComponentStore.IncrementComponentOrderVersion(archetype,
entityComponentStore->GetChunk(entity)->SharedComponentValues);
entityComponentStore->IncrementComponentTypeOrderVersion(archetype);
EntityManagerChangeArchetypeUtility.SetArchetype(entity, newType, sharedComponentValues,
entityComponentStore, managedComponentStore);
}
}
}
}