/// <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);
}
/// <summary>
/// Builds high level chunk changes between the given chunk sets.
///
/// Created chunks are from the srcWorld while destroyed chunks point to the dstWorld.
/// </summary>
/// <param name="srcChunks">A set of chunks from the srcWorld to consider.</param>
/// <param name="dstChunks">A set of chunks from the dstWorld to consider.</param>
/// <param name="dstChunkToSrcChunkSequenceNumbers">Mapping of sequence numbers for dstChunk to srcChunk.</param>
/// <param name="allocator">The allocator that should be used for the returned structure.</param>
/// <returns>A set of chunks which should have been created and/or destroyed from the srcWorld.</returns>
public static unsafe ArchetypeChunkChanges GetArchetypeChunkChanges(
NativeArray <ArchetypeChunk> srcChunks,
NativeArray <ArchetypeChunk> dstChunks,
Allocator allocator)
{
var createdEntityCount = 0;
var destroyedEntityCount = 0;
var createdChunks = new NativeList <ArchetypeChunk>(srcChunks.Length, allocator);
var destroyedChunks = new NativeList <ArchetypeChunk>(dstChunks.Length, allocator);
var createdChunkFlags = new NativeList <ChunkChangeFlags>(srcChunks.Length, allocator);
var destroyedChunkFlags = new NativeList <ChunkChangeFlags>(dstChunks.Length, allocator);
var createdChunksOffsets = new NativeArray <int>(srcChunks.Length, allocator, NativeArrayOptions.UninitializedMemory);
var destroyedChunksOffsets = new NativeArray <int>(dstChunks.Length, allocator, NativeArrayOptions.UninitializedMemory);
using (var srcChunksBySequenceNumber = new NativeHashMap <ulong, ArchetypeChunk>(srcChunks.Length, Allocator.TempJob))
using (var visitedChunks = new NativeHashMap <ulong, byte>(srcChunks.Length, Allocator.TempJob))
{
var buildSrcChunkSequenceNumberMap = new BuildChunkSequenceNumberMap
{
Chunks = srcChunks,
ChunksBySequenceNumber = srcChunksBySequenceNumber.AsParallelWriter()
}.Schedule(srcChunks.Length, 64);
var buildArchetypeChunkChanges = new BuildArchetypeChunkChanges
{
SrcChunks = srcChunks,
DstChunks = dstChunks,
SrcChunksBySequenceNumber = srcChunksBySequenceNumber,
CreatedChunks = createdChunks,
CreatedChunkFlags = createdChunkFlags,
CreatedChunkOffsets = createdChunksOffsets,
DestroyedChunks = destroyedChunks,
DestroyedChunkFlags = destroyedChunkFlags,
DestroyedChunkOffsets = destroyedChunksOffsets,
VisitedChunks = visitedChunks,
CreateEntityCount = &createdEntityCount,
DestroyedEntityCount = &destroyedEntityCount
}.Schedule(buildSrcChunkSequenceNumberMap);
buildArchetypeChunkChanges.Complete();
}
return(new ArchetypeChunkChanges(
new ArchetypeChunkCollection(createdChunks, createdChunkFlags, createdChunksOffsets, createdEntityCount),
new ArchetypeChunkCollection(destroyedChunks, destroyedChunkFlags, destroyedChunksOffsets, destroyedEntityCount)));
}
