1 files changed, 224 insertions, 584 deletions

diff --git a/src/ChunkMap.cpp b/src/ChunkMap.cpp
index cb60b4841..7c4162b25 100644
--- a/src/ChunkMap.cpp
+++ b/src/ChunkMap.cpp
@@ -44,7 +44,6 @@ cChunkMap::cChunkMap(cWorld * a_World) :
 		)
 	)
 {
-
 }
 
 
@@ -53,91 +52,40 @@ cChunkMap::cChunkMap(cWorld * a_World) :
 
 cChunkMap::~cChunkMap()
 {
-	// Explicitly destroy all chunks and ChunkLayers, so that they're guaranteed to be
+	// Explicitly destroy all chunks, so that they're guaranteed to be
 	// destroyed before other internals. This fixes crashes on stopping the server.
 	// because the chunk destructor deletes entities and those may access the chunkmap.
 	// Also, the cChunkData destructor accesses the chunkMap's allocator.
-	m_Layers.clear();
-}
-
-
-
-
-
-void cChunkMap::RemoveLayer(cChunkLayer * a_Layer)
-{
-	cCSLock Lock(m_CSLayers);
-	m_Layers.erase(std::pair<int, int>(a_Layer->GetX(), a_Layer->GetZ()));
-}
-
-
-
-
-
-cChunkMap::cChunkLayer * cChunkMap::GetLayer(int a_LayerX, int a_LayerZ)
-{
-	cCSLock Lock(m_CSLayers);
-	auto it = m_Layers.find(std::pair<int, int>(a_LayerX, a_LayerZ));
-	if (it !=m_Layers.end())
-	{
-		cChunkLayer & Layer = it->second;
-		return &Layer;
-	}
-
-	// Not found, create new:
-	auto EmplaceResult = m_Layers.emplace(std::piecewise_construct,
-		std::forward_as_tuple(a_LayerX, a_LayerZ),
-		std::forward_as_tuple(a_LayerX, a_LayerZ, this, *m_Pool));
-
-	// EmplaceResult.second = a bool, if false, then the item is already there.
-	// EmplaceResult.first = an iterator pointing to the inserted item
-	// EmplaceResult.first->second = the inserted chunk layer
-	// EmplaceResult.first->first = the item's key (an std::pair if chunk X and chunk Z) - we don't need this
-
-	ASSERT (EmplaceResult.second == true);  // Make sure the element did not exist prior to the insertion
-	cChunkLayer & Layer = (EmplaceResult.first->second);
-	return &Layer;
+	m_Chunks.clear();
 }
 
 
 
 
 
-cChunkMap::cChunkLayer * cChunkMap::FindLayerForChunk(int a_ChunkX, int a_ChunkZ)
+cChunkPtr cChunkMap::ConstructChunk(int a_ChunkX, int a_ChunkZ)
 {
-	const int LayerX = FAST_FLOOR_DIV(a_ChunkX, LAYER_SIZE);
-	const int LayerZ = FAST_FLOOR_DIV(a_ChunkZ, LAYER_SIZE);
-	return FindLayer(LayerX, LayerZ);
-}
-
-
-
-
-
-cChunkMap::cChunkLayer * cChunkMap::FindLayer(int a_LayerX, int a_LayerZ)
-{
-	ASSERT(m_CSLayers.IsLockedByCurrentThread());
-
-	auto it = m_Layers.find(std::pair<int, int>(a_LayerX, a_LayerZ));
-	if (it != m_Layers.end())
+	auto Chunk = FindChunk(a_ChunkX, a_ChunkZ);
+	if (Chunk == nullptr)
 	{
-		cChunkLayer & Layer = it->second;
-		return &Layer;
+		return (
+			*m_Chunks.emplace(
+				ChunkCoordinate{ a_ChunkX, a_ChunkZ },
+				cpp14::make_unique<cChunk>(
+					a_ChunkX,
+					a_ChunkZ,
+					this,
+					GetWorld(),
+					FindChunk(a_ChunkX - 1, a_ChunkZ),
+					FindChunk(a_ChunkX + 1, a_ChunkZ),
+					FindChunk(a_ChunkX, a_ChunkZ - 1),
+					FindChunk(a_ChunkX, a_ChunkZ + 1),
+					*m_Pool
+				)
+			).first
+		).second.get();
 	}
-
-	// Not found
-	return nullptr;
-}
-
-
-
-
-
-cChunkMap::cChunkLayer * cChunkMap::GetLayerForChunk(int a_ChunkX, int a_ChunkZ)
-{
-	const int LayerX = FAST_FLOOR_DIV(a_ChunkX, LAYER_SIZE);
-	const int LayerZ = FAST_FLOOR_DIV(a_ChunkZ, LAYER_SIZE);
-	return GetLayer(LayerX, LayerZ);
+	return Chunk;
 }
 
 
@@ -146,16 +94,9 @@ cChunkMap::cChunkLayer * cChunkMap::GetLayerForChunk(int a_ChunkX, int a_ChunkZ)
 
 cChunkPtr cChunkMap::GetChunk(int a_ChunkX, int a_ChunkZ)
 {
-	ASSERT(m_CSLayers.IsLockedByCurrentThread());  // m_CSLayers should already be locked by the operation that called us
+	ASSERT(m_CSChunks.IsLockedByCurrentThread());  // m_CSChunks should already be locked by the operation that called us
 
-	cChunkLayer * Layer = GetLayerForChunk(a_ChunkX, a_ChunkZ);
-	if (Layer == nullptr)
-	{
-		// An error must have occurred, since layers are automatically created if they don't exist
-		return nullptr;
-	}
-
-	cChunkPtr Chunk = Layer->GetChunk(a_ChunkX, a_ChunkZ);
+	auto Chunk = ConstructChunk(a_ChunkX, a_ChunkZ);
 	if (Chunk == nullptr)
 	{
 		return nullptr;
@@ -175,16 +116,9 @@ cChunkPtr cChunkMap::GetChunk(int a_ChunkX, int a_ChunkZ)
 
 cChunkPtr cChunkMap::GetChunkNoGen(int a_ChunkX, int a_ChunkZ)
 {
-	ASSERT(m_CSLayers.IsLockedByCurrentThread());  // m_CSLayers should already be locked by the operation that called us
+	ASSERT(m_CSChunks.IsLockedByCurrentThread());  // m_CSChunks should already be locked by the operation that called us
 
-	cChunkLayer * Layer = GetLayerForChunk(a_ChunkX, a_ChunkZ);
-	if (Layer == nullptr)
-	{
-		// An error must have occurred, since layers are automatically created if they don't exist
-		return nullptr;
-	}
-
-	cChunkPtr Chunk = Layer->GetChunk(a_ChunkX, a_ChunkZ);
+	auto Chunk = ConstructChunk(a_ChunkX, a_ChunkZ);
 	if (Chunk == nullptr)
 	{
 		return nullptr;
@@ -202,18 +136,10 @@ cChunkPtr cChunkMap::GetChunkNoGen(int a_ChunkX, int a_ChunkZ)
 
 
 
-cChunkPtr cChunkMap::GetChunkNoLoad( int a_ChunkX, int a_ChunkZ)
+cChunkPtr cChunkMap::GetChunkNoLoad(int a_ChunkX, int a_ChunkZ)
 {
-	ASSERT(m_CSLayers.IsLockedByCurrentThread());  // m_CSLayers should already be locked by the operation that called us
-
-	cChunkLayer * Layer = GetLayerForChunk( a_ChunkX, a_ChunkZ);
-	if (Layer == nullptr)
-	{
-		// An error must have occurred, since layers are automatically created if they don't exist
-		return nullptr;
-	}
-
-	return Layer->GetChunk(a_ChunkX, a_ChunkZ);
+	ASSERT(m_CSChunks.IsLockedByCurrentThread());  // m_CSChunks should already be locked by the operation that called us
+	return ConstructChunk(a_ChunkX, a_ChunkZ);
 }
 
 
@@ -222,8 +148,8 @@ cChunkPtr cChunkMap::GetChunkNoLoad( int a_ChunkX, int a_ChunkZ)
 
 bool cChunkMap::LockedGetBlock(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta)
 {
-	// We already have m_CSLayers locked since this can be called only from within the tick thread
-	ASSERT(m_CSLayers.IsLockedByCurrentThread());
+	// We already have m_CSChunks locked since this can be called only from within the tick thread
+	ASSERT(m_CSChunks.IsLockedByCurrentThread());
 
 	int ChunkX, ChunkZ;
 	cChunkDef::AbsoluteToRelative(a_BlockX, a_BlockY, a_BlockZ, ChunkX, ChunkZ);
@@ -244,8 +170,8 @@ bool cChunkMap::LockedGetBlock(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTY
 
 bool cChunkMap::LockedGetBlockType(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE & a_BlockType)
 {
-	// We already have m_CSLayers locked since this can be called only from within the tick thread
-	ASSERT(m_CSLayers.IsLockedByCurrentThread());
+	// We already have m_CSChunks locked since this can be called only from within the tick thread
+	ASSERT(m_CSChunks.IsLockedByCurrentThread());
 
 	int ChunkX, ChunkZ;
 	cChunkDef::AbsoluteToRelative(a_BlockX, a_BlockY, a_BlockZ, ChunkX, ChunkZ);
@@ -265,8 +191,8 @@ bool cChunkMap::LockedGetBlockType(int a_BlockX, int a_BlockY, int a_BlockZ, BLO
 
 bool cChunkMap::LockedGetBlockMeta(int a_BlockX, int a_BlockY, int a_BlockZ, NIBBLETYPE & a_BlockMeta)
 {
-	// We already have m_CSLayers locked since this can be called only from within the tick thread
-	ASSERT(m_CSLayers.IsLockedByCurrentThread());
+	// We already have m_CSChunks locked since this can be called only from within the tick thread
+	ASSERT(m_CSChunks.IsLockedByCurrentThread());
 
 	int ChunkX, ChunkZ;
 	cChunkDef::AbsoluteToRelative(a_BlockX, a_BlockY, a_BlockZ, ChunkX, ChunkZ);
@@ -286,7 +212,7 @@ bool cChunkMap::LockedGetBlockMeta(int a_BlockX, int a_BlockY, int a_BlockZ, NIB
 
 bool cChunkMap::LockedSetBlock(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE   a_BlockType, NIBBLETYPE   a_BlockMeta)
 {
-	// We already have m_CSLayers locked since this can be called only from within the tick thread
+	// We already have m_CSChunks locked since this can be called only from within the tick thread
 	int ChunkX, ChunkZ;
 	cChunkDef::AbsoluteToRelative(a_BlockX, a_BlockY, a_BlockZ, ChunkX, ChunkZ);
 	cChunkPtr Chunk = GetChunkNoLoad(ChunkX, ChunkZ);
@@ -305,7 +231,7 @@ bool cChunkMap::LockedSetBlock(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTY
 
 bool cChunkMap::LockedFastSetBlock(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta)
 {
-	// We already have m_CSLayers locked since this can be called only from within the tick thread
+	// We already have m_CSChunks locked since this can be called only from within the tick thread
 	int ChunkX, ChunkZ;
 	cChunkDef::AbsoluteToRelative(a_BlockX, a_BlockY, a_BlockZ, ChunkX, ChunkZ);
 	cChunkPtr Chunk = GetChunkNoLoad(ChunkX, ChunkZ);
@@ -324,14 +250,10 @@ bool cChunkMap::LockedFastSetBlock(int a_BlockX, int a_BlockY, int a_BlockZ, BLO
 
 cChunk * cChunkMap::FindChunk(int a_ChunkX, int a_ChunkZ)
 {
-	ASSERT(m_CSLayers.IsLockedByCurrentThread());
+	ASSERT(m_CSChunks.IsLockedByCurrentThread());
 
-	cChunkLayer * Layer = FindLayerForChunk(a_ChunkX, a_ChunkZ);
-	if (Layer == nullptr)
-	{
-		return nullptr;
-	}
-	return Layer->FindChunk(a_ChunkX, a_ChunkZ);
+	auto Chunk = m_Chunks.find({ a_ChunkX, a_ChunkZ });
+	return (Chunk == m_Chunks.end()) ? nullptr : Chunk->second.get();
 }
 
 
@@ -340,7 +262,7 @@ cChunk * cChunkMap::FindChunk(int a_ChunkX, int a_ChunkZ)
 
 void cChunkMap::BroadcastAttachEntity(const cEntity & a_Entity, const cEntity & a_Vehicle)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_Entity.GetChunkX(), a_Entity.GetChunkZ());
 	if (Chunk == nullptr)
 	{
@@ -356,7 +278,7 @@ void cChunkMap::BroadcastAttachEntity(const cEntity & a_Entity, const cEntity &
 
 void cChunkMap::BroadcastBlockAction(int a_BlockX, int a_BlockY, int a_BlockZ, char a_Byte1, char a_Byte2, BLOCKTYPE a_BlockType, const cClientHandle * a_Exclude)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	int x, z, ChunkX, ChunkZ;
 	x = a_BlockX;
 	z = a_BlockZ;
@@ -376,7 +298,7 @@ void cChunkMap::BroadcastBlockAction(int a_BlockX, int a_BlockY, int a_BlockZ, c
 
 void cChunkMap::BroadcastBlockBreakAnimation(UInt32 a_EntityID, int a_BlockX, int a_BlockY, int a_BlockZ, char a_Stage, const cClientHandle * a_Exclude)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	int ChunkX, ChunkZ;
 
 	cChunkDef::BlockToChunk(a_BlockX, a_BlockZ, ChunkX, ChunkZ);
@@ -395,7 +317,7 @@ void cChunkMap::BroadcastBlockBreakAnimation(UInt32 a_EntityID, int a_BlockX, in
 
 void cChunkMap::BroadcastBlockEntity(int a_BlockX, int a_BlockY, int a_BlockZ, const cClientHandle * a_Exclude)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	int ChunkX, ChunkZ;
 	cChunkDef::BlockToChunk(a_BlockX, a_BlockZ, ChunkX, ChunkZ);
 	cChunkPtr Chunk = GetChunkNoGen(ChunkX, ChunkZ);
@@ -412,7 +334,7 @@ void cChunkMap::BroadcastBlockEntity(int a_BlockX, int a_BlockY, int a_BlockZ, c
 
 void cChunkMap::BroadcastCollectEntity(const cEntity & a_Entity, const cPlayer & a_Player, const cClientHandle * a_Exclude)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_Entity.GetChunkX(), a_Entity.GetChunkZ());
 	if (Chunk == nullptr)
 	{
@@ -428,7 +350,7 @@ void cChunkMap::BroadcastCollectEntity(const cEntity & a_Entity, const cPlayer &
 
 void cChunkMap::BroadcastDestroyEntity(const cEntity & a_Entity, const cClientHandle * a_Exclude)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_Entity.GetChunkX(), a_Entity.GetChunkZ());
 	if (Chunk == nullptr)
 	{
@@ -444,7 +366,7 @@ void cChunkMap::BroadcastDestroyEntity(const cEntity & a_Entity, const cClientHa
 
 void cChunkMap::BroadcastDetachEntity(const cEntity & a_Entity, const cEntity & a_PreviousVehicle)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_Entity.GetChunkX(), a_Entity.GetChunkZ());
 	if (Chunk == nullptr)
 	{
@@ -460,7 +382,7 @@ void cChunkMap::BroadcastDetachEntity(const cEntity & a_Entity, const cEntity &
 
 void cChunkMap::BroadcastEntityEffect(const cEntity & a_Entity, int a_EffectID, int a_Amplifier, short a_Duration, const cClientHandle * a_Exclude)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_Entity.GetChunkX(), a_Entity.GetChunkZ());
 	if (Chunk == nullptr)
 	{
@@ -476,7 +398,7 @@ void cChunkMap::BroadcastEntityEffect(const cEntity & a_Entity, int a_EffectID,
 
 void cChunkMap::BroadcastEntityEquipment(const cEntity & a_Entity, short a_SlotNum, const cItem & a_Item, const cClientHandle * a_Exclude)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_Entity.GetChunkX(), a_Entity.GetChunkZ());
 	if (Chunk == nullptr)
 	{
@@ -492,7 +414,7 @@ void cChunkMap::BroadcastEntityEquipment(const cEntity & a_Entity, short a_SlotN
 
 void cChunkMap::BroadcastEntityHeadLook(const cEntity & a_Entity, const cClientHandle * a_Exclude)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_Entity.GetChunkX(), a_Entity.GetChunkZ());
 	if (Chunk == nullptr)
 	{
@@ -508,7 +430,7 @@ void cChunkMap::BroadcastEntityHeadLook(const cEntity & a_Entity, const cClientH
 
 void cChunkMap::BroadcastEntityLook(const cEntity & a_Entity, const cClientHandle * a_Exclude)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_Entity.GetChunkX(), a_Entity.GetChunkZ());
 	if (Chunk == nullptr)
 	{
@@ -524,7 +446,7 @@ void cChunkMap::BroadcastEntityLook(const cEntity & a_Entity, const cClientHandl
 
 void cChunkMap::BroadcastEntityMetadata(const cEntity & a_Entity, const cClientHandle * a_Exclude)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_Entity.GetChunkX(), a_Entity.GetChunkZ());
 	if (Chunk == nullptr)
 	{
@@ -540,7 +462,7 @@ void cChunkMap::BroadcastEntityMetadata(const cEntity & a_Entity, const cClientH
 
 void cChunkMap::BroadcastEntityRelMove(const cEntity & a_Entity, char a_RelX, char a_RelY, char a_RelZ, const cClientHandle * a_Exclude)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_Entity.GetChunkX(), a_Entity.GetChunkZ());
 	if (Chunk == nullptr)
 	{
@@ -556,7 +478,7 @@ void cChunkMap::BroadcastEntityRelMove(const cEntity & a_Entity, char a_RelX, ch
 
 void cChunkMap::BroadcastEntityRelMoveLook(const cEntity & a_Entity, char a_RelX, char a_RelY, char a_RelZ, const cClientHandle * a_Exclude)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_Entity.GetChunkX(), a_Entity.GetChunkZ());
 	if (Chunk == nullptr)
 	{
@@ -572,7 +494,7 @@ void cChunkMap::BroadcastEntityRelMoveLook(const cEntity & a_Entity, char a_RelX
 
 void cChunkMap::BroadcastEntityStatus(const cEntity & a_Entity, char a_Status, const cClientHandle * a_Exclude)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_Entity.GetChunkX(), a_Entity.GetChunkZ());
 	if (Chunk == nullptr)
 	{
@@ -588,7 +510,7 @@ void cChunkMap::BroadcastEntityStatus(const cEntity & a_Entity, char a_Status, c
 
 void cChunkMap::BroadcastEntityVelocity(const cEntity & a_Entity, const cClientHandle * a_Exclude)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_Entity.GetChunkX(), a_Entity.GetChunkZ());
 	if (Chunk == nullptr)
 	{
@@ -604,7 +526,7 @@ void cChunkMap::BroadcastEntityVelocity(const cEntity & a_Entity, const cClientH
 
 void cChunkMap::BroadcastEntityAnimation(const cEntity & a_Entity, char a_Animation, const cClientHandle * a_Exclude)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_Entity.GetChunkX(), a_Entity.GetChunkZ());
 	if (Chunk == nullptr)
 	{
@@ -620,7 +542,7 @@ void cChunkMap::BroadcastEntityAnimation(const cEntity & a_Entity, char a_Animat
 
 void cChunkMap::BroadcastParticleEffect(const AString & a_ParticleName, float a_SrcX, float a_SrcY, float a_SrcZ, float a_OffsetX, float a_OffsetY, float a_OffsetZ, float a_ParticleData, int a_ParticleAmount, cClientHandle * a_Exclude)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	int ChunkX, ChunkZ;
 
 	cChunkDef::BlockToChunk(FloorC(a_SrcX), FloorC(a_SrcZ), ChunkX, ChunkZ);
@@ -639,7 +561,7 @@ void cChunkMap::BroadcastParticleEffect(const AString & a_ParticleName, float a_
 
 void cChunkMap::BroadcastRemoveEntityEffect(const cEntity & a_Entity, int a_EffectID, const cClientHandle * a_Exclude)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 
 	cChunkPtr Chunk = GetChunkNoGen(a_Entity.GetChunkX(), a_Entity.GetChunkZ());
 	if (Chunk == nullptr)
@@ -656,7 +578,7 @@ void cChunkMap::BroadcastRemoveEntityEffect(const cEntity & a_Entity, int a_Effe
 
 void cChunkMap::BroadcastSoundEffect(const AString & a_SoundName, double a_X, double a_Y, double a_Z, float a_Volume, float a_Pitch, const cClientHandle * a_Exclude)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	int ChunkX, ChunkZ;
 
 	cChunkDef::BlockToChunk(FloorC(std::floor(a_X)), FloorC(std::floor(a_Z)), ChunkX, ChunkZ);
@@ -675,7 +597,7 @@ void cChunkMap::BroadcastSoundEffect(const AString & a_SoundName, double a_X, do
 
 void cChunkMap::BroadcastSoundParticleEffect(const EffectID a_EffectID, int a_SrcX, int a_SrcY, int a_SrcZ, int a_Data, const cClientHandle * a_Exclude)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	int ChunkX, ChunkZ;
 
 	cChunkDef::BlockToChunk(a_SrcX, a_SrcZ, ChunkX, ChunkZ);
@@ -694,7 +616,7 @@ void cChunkMap::BroadcastSoundParticleEffect(const EffectID a_EffectID, int a_Sr
 
 void cChunkMap::BroadcastSpawnEntity(cEntity & a_Entity, const cClientHandle * a_Exclude)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_Entity.GetChunkX(), a_Entity.GetChunkZ());
 	if (Chunk == nullptr)
 	{
@@ -710,7 +632,7 @@ void cChunkMap::BroadcastSpawnEntity(cEntity & a_Entity, const cClientHandle * a
 
 void cChunkMap::BroadcastThunderbolt(int a_BlockX, int a_BlockY, int a_BlockZ, const cClientHandle * a_Exclude)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	int ChunkX, ChunkZ;
 	cChunkDef::BlockToChunk(a_BlockX, a_BlockZ, ChunkX, ChunkZ);
 	cChunkPtr Chunk = GetChunkNoGen(ChunkX, ChunkZ);
@@ -728,7 +650,7 @@ void cChunkMap::BroadcastThunderbolt(int a_BlockX, int a_BlockY, int a_BlockZ, c
 
 void cChunkMap::BroadcastUseBed(const cEntity & a_Entity, int a_BlockX, int a_BlockY, int a_BlockZ)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	int ChunkX, ChunkZ;
 
 	cChunkDef::BlockToChunk(a_BlockX, a_BlockZ, ChunkX, ChunkZ);
@@ -747,7 +669,7 @@ void cChunkMap::BroadcastUseBed(const cEntity & a_Entity, int a_BlockX, int a_Bl
 
 void cChunkMap::SendBlockEntity(int a_BlockX, int a_BlockY, int a_BlockZ, cClientHandle & a_Client)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	int ChunkX, ChunkZ;
 	cChunkDef::BlockToChunk(a_BlockX, a_BlockZ, ChunkX, ChunkZ);
 	cChunkPtr Chunk = GetChunkNoGen(ChunkX, ChunkZ);
@@ -765,7 +687,7 @@ void cChunkMap::SendBlockEntity(int a_BlockX, int a_BlockY, int a_BlockZ, cClien
 bool cChunkMap::UseBlockEntity(cPlayer * a_Player, int a_BlockX, int a_BlockY, int a_BlockZ)
 {
 	// a_Player rclked block entity at the coords specified, handle it
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	int ChunkX, ChunkZ;
 	cChunkDef::BlockToChunk(a_BlockX, a_BlockZ, ChunkX, ChunkZ);
 	cChunkPtr Chunk = GetChunkNoGen(ChunkX, ChunkZ);
@@ -782,7 +704,7 @@ bool cChunkMap::UseBlockEntity(cPlayer * a_Player, int a_BlockX, int a_BlockY, i
 
 bool cChunkMap::DoWithChunk(int a_ChunkX, int a_ChunkZ, cChunkCallback & a_Callback)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoLoad(a_ChunkX, a_ChunkZ);
 	if (Chunk == nullptr)
 	{
@@ -819,7 +741,7 @@ bool cChunkMap::DoWithChunkAt(Vector3i a_BlockPos, std::function<bool(cChunk &)>
 
 void cChunkMap::WakeUpSimulators(int a_BlockX, int a_BlockY, int a_BlockZ)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	int ChunkX, ChunkZ;
 	cChunkDef::BlockToChunk(a_BlockX, a_BlockZ, ChunkX, ChunkZ);
 	cChunkPtr Chunk = GetChunkNoGen(ChunkX, ChunkZ);
@@ -844,7 +766,7 @@ void cChunkMap::WakeUpSimulatorsInArea(int a_MinBlockX, int a_MaxBlockX, int a_M
 	int MinChunkX, MinChunkZ, MaxChunkX, MaxChunkZ;
 	cChunkDef::BlockToChunk(a_MinBlockX, a_MinBlockZ, MinChunkX, MinChunkZ);
 	cChunkDef::BlockToChunk(a_MaxBlockX, a_MaxBlockZ, MaxChunkX, MaxChunkZ);
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	for (int z = MinChunkZ; z <= MaxChunkZ; z++)
 	{
 		int MinZ = std::max(a_MinBlockZ, z * cChunkDef::Width);
@@ -878,7 +800,7 @@ void cChunkMap::WakeUpSimulatorsInArea(int a_MinBlockX, int a_MaxBlockX, int a_M
 
 void cChunkMap::MarkChunkDirty(int a_ChunkX, int a_ChunkZ)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_ChunkX, a_ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -893,7 +815,7 @@ void cChunkMap::MarkChunkDirty(int a_ChunkX, int a_ChunkZ)
 
 void cChunkMap::MarkChunkSaving(int a_ChunkX, int a_ChunkZ)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_ChunkX, a_ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -908,7 +830,7 @@ void cChunkMap::MarkChunkSaving(int a_ChunkX, int a_ChunkZ)
 
 void cChunkMap::MarkChunkSaved (int a_ChunkX, int a_ChunkZ)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_ChunkX, a_ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -926,7 +848,7 @@ void cChunkMap::SetChunkData(cSetChunkData & a_SetChunkData)
 	int ChunkX = a_SetChunkData.GetChunkX();
 	int ChunkZ = a_SetChunkData.GetChunkZ();
 	{
-		cCSLock Lock(m_CSLayers);
+		cCSLock Lock(m_CSChunks);
 		cChunkPtr Chunk = GetChunkNoLoad(ChunkX, ChunkZ);
 		if (Chunk == nullptr)
 		{
@@ -971,7 +893,7 @@ void cChunkMap::ChunkLighted(
 	const cChunkDef::BlockNibbles & a_SkyLight
 )
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoLoad(a_ChunkX, a_ChunkZ);
 	if (Chunk == nullptr)
 	{
@@ -987,7 +909,7 @@ void cChunkMap::ChunkLighted(
 
 bool cChunkMap::GetChunkData(int a_ChunkX, int a_ChunkZ, cChunkDataCallback & a_Callback)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_ChunkX, a_ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -1003,7 +925,7 @@ bool cChunkMap::GetChunkData(int a_ChunkX, int a_ChunkZ, cChunkDataCallback & a_
 
 bool cChunkMap::GetChunkBlockTypes(int a_ChunkX, int a_ChunkZ, BLOCKTYPE * a_BlockTypes)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_ChunkX, a_ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -1019,7 +941,7 @@ bool cChunkMap::GetChunkBlockTypes(int a_ChunkX, int a_ChunkZ, BLOCKTYPE * a_Blo
 
 bool cChunkMap::IsChunkQueued(int a_ChunkX, int a_ChunkZ)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoLoad(a_ChunkX, a_ChunkZ);
 	return (Chunk != nullptr) && Chunk->IsQueued();
 }
@@ -1030,7 +952,7 @@ bool cChunkMap::IsChunkQueued(int a_ChunkX, int a_ChunkZ)
 
 bool cChunkMap::IsChunkValid(int a_ChunkX, int a_ChunkZ)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoLoad(a_ChunkX, a_ChunkZ);
 	return (Chunk != nullptr) && Chunk->IsValid();
 }
@@ -1041,7 +963,7 @@ bool cChunkMap::IsChunkValid(int a_ChunkX, int a_ChunkZ)
 
 bool cChunkMap::HasChunkAnyClients(int a_ChunkX, int a_ChunkZ)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_ChunkX, a_ChunkZ);
 	return (Chunk != nullptr) && Chunk->HasAnyClients();
 }
@@ -1054,7 +976,7 @@ int  cChunkMap::GetHeight(int a_BlockX, int a_BlockZ)
 {
 	for (;;)
 	{
-		cCSLock Lock(m_CSLayers);
+		cCSLock Lock(m_CSChunks);
 		int ChunkX, ChunkZ, BlockY = 0;
 		cChunkDef::AbsoluteToRelative(a_BlockX, BlockY, a_BlockZ, ChunkX, ChunkZ);
 		cChunkPtr Chunk = GetChunk(ChunkX, ChunkZ);
@@ -1081,7 +1003,7 @@ int  cChunkMap::GetHeight(int a_BlockX, int a_BlockZ)
 bool cChunkMap::TryGetHeight(int a_BlockX, int a_BlockZ, int & a_Height)
 {
 	// Returns false if chunk not loaded / generated
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	int ChunkX, ChunkZ, BlockY = 0;
 	cChunkDef::AbsoluteToRelative(a_BlockX, BlockY, a_BlockZ, ChunkX, ChunkZ);
 	cChunkPtr Chunk = GetChunkNoLoad(ChunkX, ChunkZ);
@@ -1099,7 +1021,7 @@ bool cChunkMap::TryGetHeight(int a_BlockX, int a_BlockZ, int & a_Height)
 
 void cChunkMap::SetBlocks(const sSetBlockVector & a_Blocks)
 {
-	cCSLock lock(m_CSLayers);
+	cCSLock lock(m_CSChunks);
 	cChunkPtr chunk = nullptr;
 	int lastChunkX = 0x7fffffff;  // Bogus coords so that chunk is updated on first pass
 	int lastChunkZ = 0x7fffffff;
@@ -1138,7 +1060,7 @@ void cChunkMap::CollectPickupsByPlayer(cPlayer & a_Player)
 	// We suppose that each player keeps their chunks in memory, therefore it makes little sense to try to re-load or even generate them.
 	// The only time the chunks are not valid is when the player is downloading the initial world and they should not call this at that moment
 
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	GetChunkNoLoad(ChunkX, ChunkZ)->CollectPickupsByPlayer(a_Player);
 
 	// Check the neighboring chunks as well:
@@ -1159,7 +1081,7 @@ BLOCKTYPE cChunkMap::GetBlock(int a_BlockX, int a_BlockY, int a_BlockZ)
 	cChunkDef::AbsoluteToRelative(X, Y, Z, ChunkX, ChunkZ);
 
 	// Query the chunk, if loaded:
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunk(ChunkX, ChunkZ);
 	if ((Chunk != nullptr) && Chunk->IsValid())
 	{
@@ -1179,7 +1101,7 @@ NIBBLETYPE cChunkMap::GetBlockMeta(int a_BlockX, int a_BlockY, int a_BlockZ)
 	cChunkDef::AbsoluteToRelative(X, Y, Z, ChunkX, ChunkZ);
 
 	// Query the chunk, if loaded:
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunk(ChunkX, ChunkZ);
 	if ((Chunk != nullptr) && Chunk->IsValid())
 	{
@@ -1197,7 +1119,7 @@ NIBBLETYPE cChunkMap::GetBlockSkyLight(int a_BlockX, int a_BlockY, int a_BlockZ)
 	int ChunkX, ChunkZ;
 	cChunkDef::AbsoluteToRelative(a_BlockX, a_BlockY, a_BlockZ, ChunkX, ChunkZ);
 
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunk( ChunkX, ChunkZ);
 	if ((Chunk != nullptr) && Chunk->IsValid())
 	{
@@ -1215,7 +1137,7 @@ NIBBLETYPE cChunkMap::GetBlockBlockLight(int a_BlockX, int a_BlockY, int a_Block
 	int ChunkX, ChunkZ;
 	cChunkDef::AbsoluteToRelative(a_BlockX, a_BlockY, a_BlockZ, ChunkX, ChunkZ);
 
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunk( ChunkX, ChunkZ);
 	if ((Chunk != nullptr) && Chunk->IsValid())
 	{
@@ -1234,7 +1156,7 @@ void cChunkMap::SetBlockMeta(int a_BlockX, int a_BlockY, int a_BlockZ, NIBBLETYP
 	cChunkDef::AbsoluteToRelative(a_BlockX, a_BlockY, a_BlockZ, ChunkX, ChunkZ);
 	// a_BlockXYZ now contains relative coords!
 
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunk(ChunkX, ChunkZ);
 	if ((Chunk != nullptr) && Chunk->IsValid())
 	{
@@ -1254,7 +1176,7 @@ void cChunkMap::SetBlock(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_B
 	int ChunkX, ChunkZ, X = a_BlockX, Y = a_BlockY, Z = a_BlockZ;
 	cChunkDef::AbsoluteToRelative( X, Y, Z, ChunkX, ChunkZ);
 
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunk( ChunkX, ChunkZ);
 	if ((Chunk != nullptr) && Chunk->IsValid())
 	{
@@ -1273,7 +1195,7 @@ bool cChunkMap::GetBlockTypeMeta(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCK
 	int ChunkX, ChunkZ, X = a_BlockX, Y = a_BlockY, Z = a_BlockZ;
 	cChunkDef::AbsoluteToRelative( X, Y, Z, ChunkX, ChunkZ);
 
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunk( ChunkX, ChunkZ);
 	if ((Chunk != nullptr) && Chunk->IsValid())
 	{
@@ -1292,7 +1214,7 @@ bool cChunkMap::GetBlockInfo(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE
 	int ChunkX, ChunkZ, X = a_BlockX, Y = a_BlockY, Z = a_BlockZ;
 	cChunkDef::AbsoluteToRelative( X, Y, Z, ChunkX, ChunkZ);
 
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunk( ChunkX, ChunkZ);
 	if ((Chunk != nullptr) && Chunk->IsValid())
 	{
@@ -1308,7 +1230,7 @@ bool cChunkMap::GetBlockInfo(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE
 
 void cChunkMap::ReplaceBlocks(const sSetBlockVector & a_Blocks, BLOCKTYPE a_FilterBlockType)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	for (sSetBlockVector::const_iterator itr = a_Blocks.begin(); itr != a_Blocks.end(); ++itr)
 	{
 		cChunkPtr Chunk = GetChunk(itr->m_ChunkX, itr->m_ChunkZ);
@@ -1329,7 +1251,7 @@ void cChunkMap::ReplaceBlocks(const sSetBlockVector & a_Blocks, BLOCKTYPE a_Filt
 
 void cChunkMap::ReplaceTreeBlocks(const sSetBlockVector & a_Blocks)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	for (sSetBlockVector::const_iterator itr = a_Blocks.begin(); itr != a_Blocks.end(); ++itr)
 	{
 		cChunkPtr Chunk = GetChunk(itr->m_ChunkX, itr->m_ChunkZ);
@@ -1366,7 +1288,7 @@ EMCSBiome cChunkMap::GetBiomeAt (int a_BlockX, int a_BlockZ)
 	int ChunkX, ChunkZ, X = a_BlockX, Y = 0, Z = a_BlockZ;
 	cChunkDef::AbsoluteToRelative(X, Y, Z, ChunkX, ChunkZ);
 
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunk(ChunkX, ChunkZ);
 	if ((Chunk != nullptr) && Chunk->IsValid())
 	{
@@ -1387,7 +1309,7 @@ bool cChunkMap::SetBiomeAt(int a_BlockX, int a_BlockZ, EMCSBiome a_Biome)
 	int ChunkX, ChunkZ, X = a_BlockX, Y = 0, Z = a_BlockZ;
 	cChunkDef::AbsoluteToRelative(X, Y, Z, ChunkX, ChunkZ);
 
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunk(ChunkX, ChunkZ);
 	if ((Chunk != nullptr) && Chunk->IsValid())
 	{
@@ -1412,7 +1334,7 @@ bool cChunkMap::SetAreaBiome(int a_MinX, int a_MaxX, int a_MinZ, int a_MaxZ, EMC
 
 	// Go through all chunks, set:
 	bool res = true;
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	for (int x = MinChunkX; x <= MaxChunkX; x++)
 	{
 		int MinRelX = (x == MinChunkX) ? MinX : 0;
@@ -1442,7 +1364,7 @@ bool cChunkMap::SetAreaBiome(int a_MinX, int a_MaxX, int a_MinZ, int a_MaxZ, EMC
 bool cChunkMap::GetBlocks(sSetBlockVector & a_Blocks, bool a_ContinueOnFailure)
 {
 	bool res = true;
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	for (sSetBlockVector::iterator itr = a_Blocks.begin(); itr != a_Blocks.end(); ++itr)
 	{
 		cChunkPtr Chunk = GetChunk(itr->m_ChunkX, itr->m_ChunkZ);
@@ -1472,7 +1394,7 @@ bool cChunkMap::DigBlock(int a_BlockX, int a_BlockY, int a_BlockZ)
 	cChunkDef::AbsoluteToRelative(PosX, PosY, PosZ, ChunkX, ChunkZ);
 
 	{
-		cCSLock Lock(m_CSLayers);
+		cCSLock Lock(m_CSChunks);
 		cChunkPtr DestChunk = GetChunk( ChunkX, ChunkZ);
 		if ((DestChunk == nullptr) || !DestChunk->IsValid())
 		{
@@ -1495,7 +1417,7 @@ void cChunkMap::SendBlockTo(int a_X, int a_Y, int a_Z, cPlayer * a_Player)
 	int ChunkX, ChunkZ;
 	cChunkDef::AbsoluteToRelative(a_X, a_Y, a_Z, ChunkX, ChunkZ);
 
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunk(ChunkX, ChunkZ);
 	if ((Chunk != nullptr) && (Chunk->IsValid()))
 	{
@@ -1509,7 +1431,7 @@ void cChunkMap::SendBlockTo(int a_X, int a_Y, int a_Z, cPlayer * a_Player)
 
 void cChunkMap::CompareChunkClients(int a_ChunkX1, int a_ChunkZ1, int a_ChunkX2, int a_ChunkZ2, cClientDiffCallback & a_Callback)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk1 = GetChunkNoGen(a_ChunkX1, a_ChunkZ1);
 	if (Chunk1 == nullptr)
 	{
@@ -1576,7 +1498,7 @@ void cChunkMap::CompareChunkClients(cChunk * a_Chunk1, cChunk * a_Chunk2, cClien
 
 bool cChunkMap::AddChunkClient(int a_ChunkX, int a_ChunkZ, cClientHandle * a_Client)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunk(a_ChunkX, a_ChunkZ);
 	if (Chunk == nullptr)
 	{
@@ -1591,7 +1513,7 @@ bool cChunkMap::AddChunkClient(int a_ChunkX, int a_ChunkZ, cClientHandle * a_Cli
 
 void cChunkMap::RemoveChunkClient(int a_ChunkX, int a_ChunkZ, cClientHandle * a_Client)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_ChunkX, a_ChunkZ);
 	if (Chunk == nullptr)
 	{
@@ -1606,13 +1528,11 @@ void cChunkMap::RemoveChunkClient(int a_ChunkX, int a_ChunkZ, cClientHandle * a_
 
 void cChunkMap::RemoveClientFromChunks(cClientHandle * a_Client)
 {
-	cCSLock Lock(m_CSLayers);
-
-	for (auto & itr : m_Layers)
+	cCSLock Lock(m_CSChunks);
+	for (const auto & Chunk : m_Chunks)
 	{
-		cChunkLayer & Layer = itr.second;
-		Layer.RemoveClient(a_Client);
-	}  // for itr - m_Layers[]
+		Chunk.second->RemoveClient(a_Client);
+	}
 }
 
 
@@ -1621,7 +1541,7 @@ void cChunkMap::RemoveClientFromChunks(cClientHandle * a_Client)
 
 void cChunkMap::AddEntity(cEntity * a_Entity)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunk(a_Entity->GetChunkX(), a_Entity->GetChunkZ());
 	if (Chunk == nullptr)  // This will assert inside GetChunk in Debug builds
 	{
@@ -1639,7 +1559,7 @@ void cChunkMap::AddEntity(cEntity * a_Entity)
 
 void cChunkMap::AddEntityIfNotPresent(cEntity * a_Entity)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunk(a_Entity->GetChunkX(), a_Entity->GetChunkZ());
 	if (Chunk == nullptr)  // This will assert inside GetChunk in Debug builds
 	{
@@ -1660,11 +1580,10 @@ void cChunkMap::AddEntityIfNotPresent(cEntity * a_Entity)
 
 bool cChunkMap::HasEntity(UInt32 a_UniqueID)
 {
-	cCSLock Lock(m_CSLayers);
-	for (auto & itr : m_Layers)
+	cCSLock Lock(m_CSChunks);
+	for (const auto & Chunk : m_Chunks)
 	{
-		cChunkLayer & Layer = itr.second;
-		if (Layer.HasEntity(a_UniqueID))
+		if (Chunk.second->IsValid() && Chunk.second->HasEntity(a_UniqueID))
 		{
 			return true;
 		}
@@ -1678,7 +1597,7 @@ bool cChunkMap::HasEntity(UInt32 a_UniqueID)
 
 void cChunkMap::RemoveEntity(cEntity * a_Entity)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = a_Entity->GetParentChunk();
 
 	// Even if a chunk is not valid, it may still contain entities such as players; make sure to remove them (#1190)
@@ -1695,11 +1614,10 @@ void cChunkMap::RemoveEntity(cEntity * a_Entity)
 
 bool cChunkMap::ForEachEntity(cEntityCallback & a_Callback)
 {
-	cCSLock Lock(m_CSLayers);
-	for (auto & itr : m_Layers)
+	cCSLock Lock(m_CSChunks);
+	for (const auto & Chunk : m_Chunks)
 	{
-		cChunkLayer & Layer = itr.second;
-		if (!Layer.ForEachEntity(a_Callback))
+		if (Chunk.second->IsValid() && !Chunk.second->ForEachEntity(a_Callback))
 		{
 			return false;
 		}
@@ -1713,7 +1631,7 @@ bool cChunkMap::ForEachEntity(cEntityCallback & a_Callback)
 
 bool cChunkMap::ForEachEntityInChunk(int a_ChunkX, int a_ChunkZ, cEntityCallback & a_Callback)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_ChunkX, a_ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -1735,7 +1653,7 @@ bool cChunkMap::ForEachEntityInBox(const cBoundingBox & a_Box, cEntityCallback &
 	int MaxChunkZ = FloorC((a_Box.GetMaxZ() + cChunkDef::Width) / cChunkDef::Width);
 
 	// Iterate over each chunk in the range:
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	for (int z = MinChunkZ; z <= MaxChunkZ; z++)
 	{
 		for (int x = MinChunkX; x <= MaxChunkX; x++)
@@ -1956,12 +1874,11 @@ void cChunkMap::DoExplosionAt(double a_ExplosionSize, double a_BlockX, double a_
 
 bool cChunkMap::DoWithEntityByID(UInt32 a_UniqueID, cEntityCallback & a_Callback)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	bool res = false;
-	for (auto & itr : m_Layers)
+	for (const auto & Chunk : m_Chunks)
 	{
-		cChunkLayer & Layer = itr.second;
-		if (Layer.DoWithEntityByID(a_UniqueID, a_Callback, res))
+		if (Chunk.second->IsValid() && Chunk.second->DoWithEntityByID(a_UniqueID, a_Callback, res))
 		{
 			return res;
 		}
@@ -1975,7 +1892,7 @@ bool cChunkMap::DoWithEntityByID(UInt32 a_UniqueID, cEntityCallback & a_Callback
 
 bool cChunkMap::ForEachBlockEntityInChunk(int a_ChunkX, int a_ChunkZ, cBlockEntityCallback & a_Callback)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_ChunkX, a_ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -1990,7 +1907,7 @@ bool cChunkMap::ForEachBlockEntityInChunk(int a_ChunkX, int a_ChunkZ, cBlockEnti
 
 bool cChunkMap::ForEachBrewingstandInChunk(int a_ChunkX, int a_ChunkZ, cBrewingstandCallback & a_Callback)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_ChunkX, a_ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -2005,7 +1922,7 @@ bool cChunkMap::ForEachBrewingstandInChunk(int a_ChunkX, int a_ChunkZ, cBrewings
 
 bool cChunkMap::ForEachChestInChunk(int a_ChunkX, int a_ChunkZ, cChestCallback & a_Callback)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_ChunkX, a_ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -2020,7 +1937,7 @@ bool cChunkMap::ForEachChestInChunk(int a_ChunkX, int a_ChunkZ, cChestCallback &
 
 bool cChunkMap::ForEachDispenserInChunk(int a_ChunkX, int a_ChunkZ, cDispenserCallback & a_Callback)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_ChunkX, a_ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -2035,7 +1952,7 @@ bool cChunkMap::ForEachDispenserInChunk(int a_ChunkX, int a_ChunkZ, cDispenserCa
 
 bool cChunkMap::ForEachDropperInChunk(int a_ChunkX, int a_ChunkZ, cDropperCallback & a_Callback)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_ChunkX, a_ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -2050,7 +1967,7 @@ bool cChunkMap::ForEachDropperInChunk(int a_ChunkX, int a_ChunkZ, cDropperCallba
 
 bool cChunkMap::ForEachDropSpenserInChunk(int a_ChunkX, int a_ChunkZ, cDropSpenserCallback & a_Callback)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_ChunkX, a_ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -2065,7 +1982,7 @@ bool cChunkMap::ForEachDropSpenserInChunk(int a_ChunkX, int a_ChunkZ, cDropSpens
 
 bool cChunkMap::ForEachFurnaceInChunk(int a_ChunkX, int a_ChunkZ, cFurnaceCallback & a_Callback)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(a_ChunkX, a_ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -2083,7 +2000,7 @@ bool cChunkMap::DoWithBlockEntityAt(int a_BlockX, int a_BlockY, int a_BlockZ, cB
 	int ChunkX, ChunkZ;
 	int BlockX = a_BlockX, BlockY = a_BlockY, BlockZ = a_BlockZ;
 	cChunkDef::AbsoluteToRelative(BlockX, BlockY, BlockZ, ChunkX, ChunkZ);
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(ChunkX, ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -2101,7 +2018,7 @@ bool cChunkMap::DoWithBeaconAt(int a_BlockX, int a_BlockY, int a_BlockZ, cBeacon
 	int ChunkX, ChunkZ;
 	int BlockX = a_BlockX, BlockY = a_BlockY, BlockZ = a_BlockZ;
 	cChunkDef::AbsoluteToRelative(BlockX, BlockY, BlockZ, ChunkX, ChunkZ);
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(ChunkX, ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -2119,7 +2036,7 @@ bool cChunkMap::DoWithBrewingstandAt(int a_BlockX, int a_BlockY, int a_BlockZ, c
 	int ChunkX, ChunkZ;
 	int BlockX = a_BlockX, BlockY = a_BlockY, BlockZ = a_BlockZ;
 	cChunkDef::AbsoluteToRelative(BlockX, BlockY, BlockZ, ChunkX, ChunkZ);
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(ChunkX, ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -2137,7 +2054,7 @@ bool cChunkMap::DoWithChestAt(int a_BlockX, int a_BlockY, int a_BlockZ, cChestCa
 	int ChunkX, ChunkZ;
 	int BlockX = a_BlockX, BlockY = a_BlockY, BlockZ = a_BlockZ;
 	cChunkDef::AbsoluteToRelative(BlockX, BlockY, BlockZ, ChunkX, ChunkZ);
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(ChunkX, ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -2155,7 +2072,7 @@ bool cChunkMap::DoWithDispenserAt(int a_BlockX, int a_BlockY, int a_BlockZ, cDis
 	int ChunkX, ChunkZ;
 	int BlockX = a_BlockX, BlockY = a_BlockY, BlockZ = a_BlockZ;
 	cChunkDef::AbsoluteToRelative(BlockX, BlockY, BlockZ, ChunkX, ChunkZ);
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(ChunkX, ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -2173,7 +2090,7 @@ bool cChunkMap::DoWithDropperAt(int a_BlockX, int a_BlockY, int a_BlockZ, cDropp
 	int ChunkX, ChunkZ;
 	int BlockX = a_BlockX, BlockY = a_BlockY, BlockZ = a_BlockZ;
 	cChunkDef::AbsoluteToRelative(BlockX, BlockY, BlockZ, ChunkX, ChunkZ);
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(ChunkX, ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -2191,7 +2108,7 @@ bool cChunkMap::DoWithDropSpenserAt(int a_BlockX, int a_BlockY, int a_BlockZ, cD
 	int ChunkX, ChunkZ;
 	int BlockX = a_BlockX, BlockY = a_BlockY, BlockZ = a_BlockZ;
 	cChunkDef::AbsoluteToRelative(BlockX, BlockY, BlockZ, ChunkX, ChunkZ);
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(ChunkX, ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -2209,7 +2126,7 @@ bool cChunkMap::DoWithFurnaceAt(int a_BlockX, int a_BlockY, int a_BlockZ, cFurna
 	int ChunkX, ChunkZ;
 	int BlockX = a_BlockX, BlockY = a_BlockY, BlockZ = a_BlockZ;
 	cChunkDef::AbsoluteToRelative(BlockX, BlockY, BlockZ, ChunkX, ChunkZ);
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(ChunkX, ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -2226,7 +2143,7 @@ bool cChunkMap::DoWithNoteBlockAt(int a_BlockX, int a_BlockY, int a_BlockZ, cNot
 	int ChunkX, ChunkZ;
 	int BlockX = a_BlockX, BlockY = a_BlockY, BlockZ = a_BlockZ;
 	cChunkDef::AbsoluteToRelative(BlockX, BlockY, BlockZ, ChunkX, ChunkZ);
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(ChunkX, ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -2243,7 +2160,7 @@ bool cChunkMap::DoWithCommandBlockAt(int a_BlockX, int a_BlockY, int a_BlockZ, c
 	int ChunkX, ChunkZ;
 	int BlockX = a_BlockX, BlockY = a_BlockY, BlockZ = a_BlockZ;
 	cChunkDef::AbsoluteToRelative(BlockX, BlockY, BlockZ, ChunkX, ChunkZ);
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(ChunkX, ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -2261,7 +2178,7 @@ bool cChunkMap::DoWithMobHeadAt(int a_BlockX, int a_BlockY, int a_BlockZ, cMobHe
 	int ChunkX, ChunkZ;
 	int BlockX = a_BlockX, BlockY = a_BlockY, BlockZ = a_BlockZ;
 	cChunkDef::AbsoluteToRelative(BlockX, BlockY, BlockZ, ChunkX, ChunkZ);
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(ChunkX, ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -2279,7 +2196,7 @@ bool cChunkMap::DoWithFlowerPotAt(int a_BlockX, int a_BlockY, int a_BlockZ, cFlo
 	int ChunkX, ChunkZ;
 	int BlockX = a_BlockX, BlockY = a_BlockY, BlockZ = a_BlockZ;
 	cChunkDef::AbsoluteToRelative(BlockX, BlockY, BlockZ, ChunkX, ChunkZ);
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(ChunkX, ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -2297,7 +2214,7 @@ bool cChunkMap::GetSignLines(int a_BlockX, int a_BlockY, int a_BlockZ, AString &
 	int ChunkX, ChunkZ;
 	int BlockX = a_BlockX, BlockY = a_BlockY, BlockZ = a_BlockZ;
 	cChunkDef::AbsoluteToRelative(BlockX, BlockY, BlockZ, ChunkX, ChunkZ);
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoGen(ChunkX, ChunkZ);
 	if ((Chunk == nullptr) || !Chunk->IsValid())
 	{
@@ -2312,7 +2229,7 @@ bool cChunkMap::GetSignLines(int a_BlockX, int a_BlockY, int a_BlockZ, AString &
 
 void cChunkMap::TouchChunk(int a_ChunkX, int a_ChunkZ)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	GetChunk(a_ChunkX, a_ChunkZ);
 }
 
@@ -2322,7 +2239,7 @@ void cChunkMap::TouchChunk(int a_ChunkX, int a_ChunkZ)
 
 void cChunkMap::PrepareChunk(int a_ChunkX, int a_ChunkZ, std::unique_ptr<cChunkCoordCallback> a_Callback)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoLoad(a_ChunkX, a_ChunkZ);
 
 	// If the chunk is not prepared, queue it in the lighting thread, that will do all the needed processing:
@@ -2345,7 +2262,7 @@ void cChunkMap::PrepareChunk(int a_ChunkX, int a_ChunkZ, std::unique_ptr<cChunkC
 
 bool cChunkMap::GenerateChunk(int a_ChunkX, int a_ChunkZ, cChunkCoordCallback * a_Callback)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoLoad(a_ChunkX, a_ChunkZ);
 	if (Chunk == nullptr)
 	{
@@ -2381,7 +2298,7 @@ bool cChunkMap::GenerateChunk(int a_ChunkX, int a_ChunkZ, cChunkCoordCallback *
 				}
 
 				// The chunk failed to load, generate it:
-				cCSLock CBLock(m_ChunkMap.m_CSLayers);
+				cCSLock CBLock(m_ChunkMap.m_CSChunks);
 				cChunkPtr CBChunk = m_ChunkMap.GetChunkNoLoad(a_CBChunkX, a_CBChunkZ);
 
 				if (CBChunk == nullptr)
@@ -2421,7 +2338,7 @@ bool cChunkMap::GenerateChunk(int a_ChunkX, int a_ChunkZ, cChunkCoordCallback *
 
 void cChunkMap::ChunkLoadFailed(int a_ChunkX, int a_ChunkZ)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoLoad(a_ChunkX, a_ChunkZ);
 	if (Chunk == nullptr)
 	{
@@ -2436,7 +2353,7 @@ void cChunkMap::ChunkLoadFailed(int a_ChunkX, int a_ChunkZ)
 
 bool cChunkMap::SetSignLines(int a_BlockX, int a_BlockY, int a_BlockZ, const AString & a_Line1, const AString & a_Line2, const AString & a_Line3, const AString & a_Line4)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	int ChunkX, ChunkZ;
 	cChunkDef::BlockToChunk(a_BlockX, a_BlockZ, ChunkX, ChunkZ);
 	cChunkPtr Chunk = GetChunkNoGen(ChunkX, ChunkZ);
@@ -2453,7 +2370,7 @@ bool cChunkMap::SetSignLines(int a_BlockX, int a_BlockY, int a_BlockZ, const ASt
 
 void cChunkMap::MarkChunkRegenerating(int a_ChunkX, int a_ChunkZ)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoLoad(a_ChunkX, a_ChunkZ);
 	if (Chunk == nullptr)
 	{
@@ -2469,7 +2386,7 @@ void cChunkMap::MarkChunkRegenerating(int a_ChunkX, int a_ChunkZ)
 
 bool cChunkMap::IsChunkLighted(int a_ChunkX, int a_ChunkZ)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoLoad(a_ChunkX, a_ChunkZ);
 	if (Chunk == nullptr)
 	{
@@ -2486,7 +2403,7 @@ bool cChunkMap::IsChunkLighted(int a_ChunkX, int a_ChunkZ)
 bool cChunkMap::ForEachChunkInRect(int a_MinChunkX, int a_MaxChunkX, int a_MinChunkZ, int a_MaxChunkZ, cChunkDataCallback & a_Callback)
 {
 	bool Result = true;
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	for (int z = a_MinChunkZ; z <= a_MaxChunkZ; z++)
 	{
 		for (int x = a_MinChunkX; x <= a_MaxChunkX; x++)
@@ -2514,22 +2431,14 @@ bool cChunkMap::ForEachChunkInRect(int a_MinChunkX, int a_MaxChunkX, int a_MinCh
 
 bool cChunkMap::ForEachLoadedChunk(std::function<bool(int, int)> a_Callback)
 {
-	cCSLock Lock(m_CSLayers);
-	for (auto & itr: m_Layers)
+	cCSLock Lock(m_CSChunks);
+	for (const auto & Chunk : m_Chunks)
 	{
-		cChunkLayer & Layer = itr.second;
-		for (int x = 0; x < LAYER_SIZE; x++)
+		if (Chunk.second->IsValid())
 		{
-			for (int z = 0; z < LAYER_SIZE; z++)
+			if (a_Callback(Chunk.first.ChunkX, Chunk.first.ChunkZ))
 			{
-				cChunkPtr p = Layer.FindChunk(Layer.GetX() * LAYER_SIZE + x, Layer.GetZ() * LAYER_SIZE + z);
-				if ((p != nullptr) && p->IsValid())  // if chunk is loaded
-				{
-					if (a_Callback(p->GetPosX(), p->GetPosZ()))
-					{
-						return false;
-					}
-				}
+				return false;
 			}
 		}
 	}
@@ -2556,7 +2465,7 @@ bool cChunkMap::WriteBlockArea(cBlockArea & a_Area, int a_MinBlockX, int a_MinBl
 
 	// Iterate over chunks, write data into each:
 	bool Result = true;
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	for (int z = MinChunkZ; z <= MaxChunkZ; z++)
 	{
 		for (int x = MinChunkX; x <= MaxChunkX; x++)
@@ -2582,15 +2491,15 @@ void cChunkMap::GetChunkStats(int & a_NumChunksValid, int & a_NumChunksDirty)
 {
 	a_NumChunksValid = 0;
 	a_NumChunksDirty = 0;
-	cCSLock Lock(m_CSLayers);
-	for (auto & itr : m_Layers)
+	cCSLock Lock(m_CSChunks);
+	for (const auto & Chunk : m_Chunks)
 	{
-		cChunkLayer & Layer = itr.second;
-		int NumValid = 0, NumDirty = 0;
-		Layer.GetChunkStats(NumValid, NumDirty);
-		a_NumChunksValid += NumValid;
-		a_NumChunksDirty += NumDirty;
-	}  // for itr - m_Layers[]
+		a_NumChunksValid++;
+		if (Chunk.second->IsDirty())
+		{
+			a_NumChunksDirty++;
+		}
+	}
 }
 
 
@@ -2602,7 +2511,7 @@ bool cChunkMap::GrowMelonPumpkin(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCK
 	int ChunkX, ChunkZ;
 	cChunkDef::AbsoluteToRelative(a_BlockX, a_BlockY, a_BlockZ, ChunkX, ChunkZ);
 
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoLoad(ChunkX, ChunkZ);
 	if (Chunk != nullptr)
 	{
@@ -2620,7 +2529,7 @@ int cChunkMap::GrowSugarcane(int a_BlockX, int a_BlockY, int a_BlockZ, int a_Num
 	int ChunkX, ChunkZ;
 	cChunkDef::AbsoluteToRelative(a_BlockX, a_BlockY, a_BlockZ, ChunkX, ChunkZ);
 
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoLoad(ChunkX, ChunkZ);
 	if (Chunk != nullptr)
 	{
@@ -2638,7 +2547,7 @@ int cChunkMap::GrowCactus(int a_BlockX, int a_BlockY, int a_BlockZ, int a_NumBlo
 	int ChunkX, ChunkZ;
 	cChunkDef::AbsoluteToRelative(a_BlockX, a_BlockY, a_BlockZ, ChunkX, ChunkZ);
 
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoLoad(ChunkX, ChunkZ);
 	if (Chunk != nullptr)
 	{
@@ -2656,7 +2565,7 @@ bool cChunkMap::GrowTallGrass(int a_BlockX, int a_BlockY, int a_BlockZ)
 	int ChunkX, ChunkZ;
 	cChunkDef::AbsoluteToRelative(a_BlockX, a_BlockY, a_BlockZ, ChunkX, ChunkZ);
 
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoLoad(ChunkX, ChunkZ);
 	if (Chunk != nullptr)
 	{
@@ -2674,7 +2583,7 @@ void cChunkMap::SetNextBlockTick(int a_BlockX, int a_BlockY, int a_BlockZ)
 	int ChunkX, ChunkZ;
 	cChunkDef::AbsoluteToRelative(a_BlockX, a_BlockY, a_BlockZ, ChunkX, ChunkZ);
 
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoLoad(ChunkX, ChunkZ);
 	if (Chunk != nullptr)
 	{
@@ -2687,12 +2596,17 @@ void cChunkMap::SetNextBlockTick(int a_BlockX, int a_BlockY, int a_BlockZ)
 
 void cChunkMap::CollectMobCensus(cMobCensus & a_ToFill)
 {
-	cCSLock Lock(m_CSLayers);
-	for (auto & itr: m_Layers)
+	cCSLock Lock(m_CSChunks);
+	for (const auto & Chunk : m_Chunks)
 	{
-		cChunkLayer & Layer = itr.second;
-		Layer.CollectMobCensus(a_ToFill);
-	}  // for itr - m_Layers
+		// We do count every Mobs in the world. But we are assuming that every chunk not loaded by any client
+		// doesn't affect us. Normally they should not have mobs because every "too far" mobs despawn
+		// If they have (f.i. when player disconnect) we assume we don't have to make them live or despawn
+		if (Chunk.second->IsValid() && Chunk.second->HasAnyClients())
+		{
+			Chunk.second->CollectMobCensus(a_ToFill);
+		}
+	}
 }
 
 
@@ -2702,12 +2616,15 @@ void cChunkMap::CollectMobCensus(cMobCensus & a_ToFill)
 
 void cChunkMap::SpawnMobs(cMobSpawner & a_MobSpawner)
 {
-	cCSLock Lock(m_CSLayers);
-	for (auto & itr: m_Layers)
+	cCSLock Lock(m_CSChunks);
+	for (const auto & Chunk : m_Chunks)
 	{
-		cChunkLayer & Layer = itr.second;
-		Layer.SpawnMobs(a_MobSpawner);
-	}  // for itr - m_Layers
+		// We only spawn close to players
+		if (Chunk.second->IsValid() && Chunk.second->HasAnyClients())
+		{
+			Chunk.second->SpawnMobs(a_MobSpawner);
+		}
+	}
 }
 
 
@@ -2716,12 +2633,15 @@ void cChunkMap::SpawnMobs(cMobSpawner & a_MobSpawner)
 
 void cChunkMap::Tick(std::chrono::milliseconds a_Dt)
 {
-	cCSLock Lock(m_CSLayers);
-	for (auto & itr: m_Layers)
+	cCSLock Lock(m_CSChunks);
+	for (const auto & Chunk : m_Chunks)
 	{
-		cChunkLayer & Layer = itr.second;
-		Layer.Tick(a_Dt);
-	}  // for itr - m_Layers
+		// Only tick chunks that are valid and should be ticked:
+		if (Chunk.second->IsValid() && Chunk.second->ShouldBeTicked())
+		{
+			Chunk.second->Tick(a_Dt);
+		}
+	}
 }
 
 
@@ -2730,7 +2650,7 @@ void cChunkMap::Tick(std::chrono::milliseconds a_Dt)
 
 void cChunkMap::TickBlock(int a_BlockX, int a_BlockY, int a_BlockZ)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	int ChunkX, ChunkZ;
 	cChunkDef::AbsoluteToRelative(a_BlockX, a_BlockY, a_BlockZ, ChunkX, ChunkZ);
 	cChunkPtr Chunk = GetChunkNoLoad(ChunkX, ChunkZ);
@@ -2747,12 +2667,21 @@ void cChunkMap::TickBlock(int a_BlockX, int a_BlockY, int a_BlockZ)
 
 void cChunkMap::UnloadUnusedChunks(void)
 {
-	cCSLock Lock(m_CSLayers);
-	for (auto & itr: m_Layers)
+	cCSLock Lock(m_CSChunks);
+	for (auto itr = m_Chunks.begin(); itr != m_Chunks.end();)
 	{
-		cChunkLayer & Layer = itr.second;
-		Layer.UnloadUnusedChunks();
-	}  // for itr - m_Layers
+		if (
+			(itr->second->CanUnload()) &&  // Can unload
+			!cPluginManager::Get()->CallHookChunkUnloading(*GetWorld(), itr->first.ChunkX, itr->first.ChunkZ)  // Plugins agree
+		)
+		{
+			itr = m_Chunks.erase(itr);
+		}
+		else
+		{
+			++itr;
+		}
+	}
 }
 
 
@@ -2761,12 +2690,14 @@ void cChunkMap::UnloadUnusedChunks(void)
 
 void cChunkMap::SaveAllChunks(void)
 {
-	cCSLock Lock(m_CSLayers);
-	for (auto & itr: m_Layers)
+	cCSLock Lock(m_CSChunks);
+	for (const auto & Chunk : m_Chunks)
 	{
-		cChunkLayer & Layer = itr.second;
-		Layer.Save();
-	}  // for itr - m_Layers[]
+		if (Chunk.second->IsValid() && Chunk.second->IsDirty())
+		{
+			GetWorld()->GetStorage().QueueSaveChunk(Chunk.first.ChunkX, Chunk.first.ChunkZ);
+		}
+	}
 }
 
 
@@ -2775,14 +2706,9 @@ void cChunkMap::SaveAllChunks(void)
 
 int cChunkMap::GetNumChunks(void)
 {
-	cCSLock Lock(m_CSLayers);
-	int NumChunks = 0;
-	for (auto & itr: m_Layers)
-	{
-		cChunkLayer & Layer = itr.second;
-		NumChunks += Layer.GetNumChunksLoaded();
-	}
-	return NumChunks;
+	cCSLock Lock(m_CSChunks);
+	return static_cast<int>(m_Chunks.size());  // TODO: change return value to unsigned type
+
 }
 
 
@@ -2804,7 +2730,7 @@ void cChunkMap::QueueTickBlock(int a_BlockX, int a_BlockY, int a_BlockZ)
 	cChunkDef::AbsoluteToRelative(a_BlockX, a_BlockY, a_BlockZ, ChunkX, ChunkZ);
 	// a_BlockXYZ now contains relative coords!
 
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoLoad(ChunkX, ChunkZ);
 	if (Chunk != nullptr)
 	{
@@ -2818,7 +2744,7 @@ void cChunkMap::QueueTickBlock(int a_BlockX, int a_BlockY, int a_BlockZ)
 
 void cChunkMap::SetChunkAlwaysTicked(int a_ChunkX, int a_ChunkZ, bool a_AlwaysTicked)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunkNoLoad(a_ChunkX, a_ChunkZ);
 	if (Chunk != nullptr)
 	{
@@ -2830,299 +2756,13 @@ void cChunkMap::SetChunkAlwaysTicked(int a_ChunkX, int a_ChunkZ, bool a_AlwaysTi
 
 
 
-////////////////////////////////////////////////////////////////////////////////
-// cChunkMap::cChunkLayer:
-
-cChunkMap::cChunkLayer::cChunkLayer(
-	int a_LayerX, int a_LayerZ,
-	cChunkMap * a_Parent,
-	cAllocationPool<cChunkData::sChunkSection> & a_Pool
-)
-	: m_LayerX( a_LayerX)
-	, m_LayerZ( a_LayerZ)
-	, m_Parent( a_Parent)
-	, m_NumChunksLoaded( 0)
-	, m_Pool(a_Pool)
-{
-	memset(m_Chunks, 0, sizeof(m_Chunks));
-}
-
-
-
-
-
-cChunkMap::cChunkLayer::~cChunkLayer()
-{
-	for (size_t i = 0; i < ARRAYCOUNT(m_Chunks); ++i)
-	{
-		delete m_Chunks[i];
-		m_Chunks[i] = nullptr;  // Must zero out, because further chunk deletions query the chunkmap for entities and that would touch deleted data
-	}  // for i - m_Chunks[]
-}
-
-
-
-
-
-cChunkPtr cChunkMap::cChunkLayer::GetChunk( int a_ChunkX, int a_ChunkZ)
-{
-	// Always returns an assigned chunkptr, but the chunk needn't be valid (loaded / generated) - callers must check
-
-	const int LocalX = a_ChunkX - m_LayerX * LAYER_SIZE;
-	const int LocalZ = a_ChunkZ - m_LayerZ * LAYER_SIZE;
-
-	if (!((LocalX < LAYER_SIZE) && (LocalZ < LAYER_SIZE) && (LocalX > -1) && (LocalZ > -1)))
-	{
-		ASSERT(!"Asking a cChunkLayer for a chunk that doesn't belong to it!");
-		return nullptr;
-	}
-
-	int Index = LocalX + LocalZ * LAYER_SIZE;
-	if (m_Chunks[Index] == nullptr)
-	{
-		cChunk * neixm = (LocalX > 0)              ? m_Chunks[Index - 1]          : m_Parent->FindChunk(a_ChunkX - 1, a_ChunkZ);
-		cChunk * neixp = (LocalX < LAYER_SIZE - 1) ? m_Chunks[Index + 1]          : m_Parent->FindChunk(a_ChunkX + 1, a_ChunkZ);
-		cChunk * neizm = (LocalZ > 0)              ? m_Chunks[Index - LAYER_SIZE] : m_Parent->FindChunk(a_ChunkX,     a_ChunkZ - 1);
-		cChunk * neizp = (LocalZ < LAYER_SIZE - 1) ? m_Chunks[Index + LAYER_SIZE] : m_Parent->FindChunk(a_ChunkX,     a_ChunkZ + 1);
-		m_Chunks[Index] = new cChunk(a_ChunkX, a_ChunkZ, m_Parent, m_Parent->GetWorld(), neixm, neixp, neizm, neizp, m_Pool);
-	}
-	return m_Chunks[Index];
-}
-
-
-
-
-
-cChunk * cChunkMap::cChunkLayer::FindChunk(int a_ChunkX, int a_ChunkZ)
-{
-	const int LocalX = a_ChunkX - m_LayerX * LAYER_SIZE;
-	const int LocalZ = a_ChunkZ - m_LayerZ * LAYER_SIZE;
-
-	if (!((LocalX < LAYER_SIZE) && (LocalZ < LAYER_SIZE) && (LocalX > -1) && (LocalZ > -1)))
-	{
-		ASSERT(!"Asking a cChunkLayer for a chunk that doesn't belong to it!");
-		return nullptr;
-	}
-
-	int Index = LocalX + LocalZ * LAYER_SIZE;
-	return m_Chunks[Index];
-}
-
-
-
-
-void cChunkMap::cChunkLayer::CollectMobCensus(cMobCensus & a_ToFill)
-{
-	for (size_t i = 0; i < ARRAYCOUNT(m_Chunks); i++)
-	{
-		// We do count every Mobs in the world. But we are assuming that every chunk not loaded by any client
-		// doesn't affect us. Normally they should not have mobs because every "too far" mobs despawn
-		// If they have (f.i. when player disconnect) we assume we don't have to make them live or despawn
-		if ((m_Chunks[i] != nullptr) && m_Chunks[i]->IsValid() && m_Chunks[i]->HasAnyClients())
-		{
-			m_Chunks[i]->CollectMobCensus(a_ToFill);
-		}
-	}  // for i - m_Chunks[]
-}
-
-
-
-
-
-
-void cChunkMap::cChunkLayer::SpawnMobs(cMobSpawner & a_MobSpawner)
-{
-	for (size_t i = 0; i < ARRAYCOUNT(m_Chunks); i++)
-	{
-		// We only spawn close to players
-		if ((m_Chunks[i] != nullptr) && m_Chunks[i]->IsValid() && m_Chunks[i]->HasAnyClients())
-		{
-			m_Chunks[i]->SpawnMobs(a_MobSpawner);
-		}
-	}  // for i - m_Chunks[]
-}
-
-
-
-
-
-void cChunkMap::cChunkLayer::Tick(std::chrono::milliseconds a_Dt)
-{
-	for (size_t i = 0; i < ARRAYCOUNT(m_Chunks); i++)
-	{
-		// Only tick chunks that should be ticked:
-		// Note that chunks that are not IsValid() will only tick players and then bailout
-		if ((m_Chunks[i] != nullptr) && m_Chunks[i]->ShouldBeTicked())
-		{
-			m_Chunks[i]->Tick(a_Dt);
-		}
-	}  // for i - m_Chunks[]
-}
-
-
-
-
-
-void cChunkMap::cChunkLayer::RemoveClient(cClientHandle * a_Client)
-{
-	for (size_t i = 0; i < ARRAYCOUNT(m_Chunks); i++)
-	{
-		if (m_Chunks[i] != nullptr)
-		{
-			m_Chunks[i]->RemoveClient(a_Client);
-		}
-	}  // for i - m_Chunks[]
-}
-
-
-
-
-
-bool cChunkMap::cChunkLayer::ForEachEntity(cEntityCallback & a_Callback)
-{
-	// Calls the callback for each entity in the entire world; returns true if all entities processed, false if the callback aborted by returning true
-	for (size_t i = 0; i < ARRAYCOUNT(m_Chunks); i++)
-	{
-		if ((m_Chunks[i] != nullptr) && m_Chunks[i]->IsValid())
-		{
-			if (!m_Chunks[i]->ForEachEntity(a_Callback))
-			{
-				return false;
-			}
-		}
-	}
-	return true;
-}
-
-
-
-
-
-bool cChunkMap::cChunkLayer::DoWithEntityByID(UInt32 a_EntityID, cEntityCallback & a_Callback, bool & a_CallbackReturn)
-{
-	// Calls the callback if the entity with the specified ID is found, with the entity object as the callback param. Returns true if entity found.
-	for (size_t i = 0; i < ARRAYCOUNT(m_Chunks); i++)
-	{
-		if ((m_Chunks[i] != nullptr) && m_Chunks[i]->IsValid())
-		{
-			if (m_Chunks[i]->DoWithEntityByID(a_EntityID, a_Callback, a_CallbackReturn))
-			{
-				return true;
-			}
-		}
-	}
-	return false;
-}
-
-
-
-
-
-bool cChunkMap::cChunkLayer::HasEntity(UInt32 a_EntityID)
-{
-	for (size_t i = 0; i < ARRAYCOUNT(m_Chunks); i++)
-	{
-		if ((m_Chunks[i] != nullptr) && m_Chunks[i]->IsValid())
-		{
-			if (m_Chunks[i]->HasEntity(a_EntityID))
-			{
-				return true;
-			}
-		}
-	}
-	return false;
-}
-
-
-
-
-
-int cChunkMap::cChunkLayer::GetNumChunksLoaded(void) const
-{
-	int NumChunks = 0;
-	for (size_t i = 0; i < ARRAYCOUNT(m_Chunks); ++i)
-	{
-		if (m_Chunks[i] != nullptr)
-		{
-			NumChunks++;
-		}
-	}  // for i - m_Chunks[]
-	return NumChunks;
-}
-
-
-
-
-
-void cChunkMap::cChunkLayer::GetChunkStats(int & a_NumChunksValid, int & a_NumChunksDirty) const
-{
-	int NumValid = 0;
-	int NumDirty = 0;
-	for (size_t i = 0; i < ARRAYCOUNT(m_Chunks); ++i)
-	{
-		if (m_Chunks[i] == nullptr)
-		{
-			continue;
-		}
-		NumValid++;
-		if (m_Chunks[i]->IsDirty())
-		{
-			NumDirty++;
-		}
-	}  // for i - m_Chunks[]
-	a_NumChunksValid = NumValid;
-	a_NumChunksDirty = NumDirty;
-}
-
-
-
-
-
-void cChunkMap::cChunkLayer::Save(void)
-{
-	cWorld * World = m_Parent->GetWorld();
-	for (size_t i = 0; i < ARRAYCOUNT(m_Chunks); ++i)
-	{
-		if ((m_Chunks[i] != nullptr) && m_Chunks[i]->IsValid() && m_Chunks[i]->IsDirty())
-		{
-			World->GetStorage().QueueSaveChunk(m_Chunks[i]->GetPosX(), m_Chunks[i]->GetPosZ());
-		}
-	}  // for i - m_Chunks[]
-}
-
-
-
-
-
-void cChunkMap::cChunkLayer::UnloadUnusedChunks(void)
-{
-	for (size_t i = 0; i < ARRAYCOUNT(m_Chunks); i++)
-	{
-		if (
-			(m_Chunks[i] != nullptr) &&   // Is valid
-			(m_Chunks[i]->CanUnload()) &&  // Can unload
-			!cPluginManager::Get()->CallHookChunkUnloading(*(m_Parent->GetWorld()), m_Chunks[i]->GetPosX(), m_Chunks[i]->GetPosZ())  // Plugins agree
-		)
-		{
-			// The cChunk destructor calls our GetChunk() while removing its entities
-			// so we still need to be able to return the chunk. Therefore we first delete, then nullptrify
-			// Doing otherwise results in bug https://forum.cuberite.org/thread-355.html
-			delete m_Chunks[i];
-			m_Chunks[i] = nullptr;
-		}
-	}  // for i - m_Chunks[]
-}
-
-
-
-
 
 void cChunkMap::FastSetBlock(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta)
 {
 	int ChunkX, ChunkZ, X = a_BlockX, Y = a_BlockY, Z = a_BlockZ;
 	cChunkDef::AbsoluteToRelative(X, Y, Z, ChunkX, ChunkZ);
 
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 	cChunkPtr Chunk = GetChunk(ChunkX, ChunkZ);
 	if ((Chunk != nullptr) && Chunk->IsValid())
 	{
@@ -3136,7 +2776,7 @@ void cChunkMap::FastSetBlock(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE
 
 void cChunkMap::AddChunkStay(cChunkStay & a_ChunkStay)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 
 	// Add it to the list:
 	ASSERT(std::find(m_ChunkStays.begin(), m_ChunkStays.end(), &a_ChunkStay) == m_ChunkStays.end());  // Has not yet been added
@@ -3171,7 +2811,7 @@ void cChunkMap::AddChunkStay(cChunkStay & a_ChunkStay)
 /** Removes the specified cChunkStay descendant from the internal list of ChunkStays. */
 void cChunkMap::DelChunkStay(cChunkStay & a_ChunkStay)
 {
-	cCSLock Lock(m_CSLayers);
+	cCSLock Lock(m_CSChunks);
 
 	// Remove from the list of active chunkstays:
 	bool HasFound = false;