/// <summary>
/// Constructs a set of changes between the given src and dst chunks.
/// </summary>
/// <remarks>
/// A chunk is considered unchanged if the <see cref="Chunk.SequenceNumber"/> matches and all type change versions match.
/// </remarks>
internal static ArchetypeChunkChanges GetArchetypeChunkChanges(
NativeArray <ArchetypeChunk> srcChunks,
NativeArray <ArchetypeChunk> dstChunks,
Allocator allocator,
out JobHandle jobHandle,
JobHandle dependsOn = default)
{
var archetypeChunkChanges = new ArchetypeChunkChanges(allocator);
var srcChunksBySequenceNumber = new NativeHashMap <ulong, ArchetypeChunk>(srcChunks.Length, Allocator.TempJob);
var buildChunkSequenceNumberMap = new BuildChunkSequenceNumberMap
{
Chunks = srcChunks,
ChunksBySequenceNumber = srcChunksBySequenceNumber.AsParallelWriter()
}.Schedule(srcChunks.Length, 64, dependsOn);
var gatherArchetypeChunkChanges = new GatherArchetypeChunkChanges
{
SrcChunks = srcChunks,
DstChunks = dstChunks,
SrcChunksBySequenceNumber = srcChunksBySequenceNumber,
CreatedChunks = archetypeChunkChanges.CreatedSrcChunks.Chunks,
CreatedChunkFlags = archetypeChunkChanges.CreatedSrcChunks.Flags,
CreatedChunkEntityCounts = archetypeChunkChanges.CreatedSrcChunks.EntityCounts,
DestroyedChunks = archetypeChunkChanges.DestroyedDstChunks.Chunks,
DestroyedChunkFlags = archetypeChunkChanges.DestroyedDstChunks.Flags,
DestroyedChunkEntityCounts = archetypeChunkChanges.DestroyedDstChunks.EntityCounts,
}.Schedule(buildChunkSequenceNumberMap);
jobHandle = srcChunksBySequenceNumber.Dispose(gatherArchetypeChunkChanges);
return(archetypeChunkChanges);
}
internal static void CopyAndReplaceChunks(
EntityManager srcEntityManager,
EntityManager dstEntityManager,
EntityQuery dstEntityQuery,
ArchetypeChunkChanges archetypeChunkChanges)
{
s_CopyAndReplaceChunksProfilerMarker.Begin();
var dstAccess = dstEntityManager.GetCheckedEntityDataAccess();
var srcAccess = srcEntityManager.GetCheckedEntityDataAccess();
var archetypeChanges = dstAccess->EntityComponentStore->BeginArchetypeChangeTracking();
DestroyChunks(dstEntityManager, archetypeChunkChanges.DestroyedDstChunks.Chunks);
CloneAndAddChunks(srcEntityManager, dstEntityManager, archetypeChunkChanges.CreatedSrcChunks.Chunks);
dstAccess->EntityComponentStore->EndArchetypeChangeTracking(archetypeChanges, dstAccess->EntityQueryManager);
srcAccess->EntityComponentStore->InvalidateChunkListCacheForChangedArchetypes();
dstAccess->EntityComponentStore->InvalidateChunkListCacheForChangedArchetypes();
//@TODO-opt: use a query that searches for all chunks that have chunk components on it
//@TODO-opt: Move this into a job
// Any chunk might have been recreated, so the ChunkHeader might be invalid
using (var allDstChunks = dstEntityQuery.CreateArchetypeChunkArray(Allocator.TempJob))
{
foreach (var chunk in allDstChunks)
{
var metaEntity = chunk.m_Chunk->metaChunkEntity;
if (metaEntity != Entity.Null)
{
if (dstEntityManager.Exists(metaEntity))
{
dstEntityManager.SetComponentData(metaEntity, new ChunkHeader {
ArchetypeChunk = chunk
});
}
}
}
}
srcAccess->EntityComponentStore->IncrementGlobalSystemVersion();
dstAccess->EntityComponentStore->IncrementGlobalSystemVersion();
s_CopyAndReplaceChunksProfilerMarker.End();
}