20 files changed, 140 insertions, 120 deletions

diff --git a/src/ChunkMap.cpp b/src/ChunkMap.cpp
index e548a02e8..43253a91d 100644
--- a/src/ChunkMap.cpp
+++ b/src/ChunkMap.cpp
@@ -1330,7 +1330,7 @@ void cChunkMap::DoExplosionAt(double a_ExplosionSize, double a_BlockX, double a_
 	);
 
 	// Wake up all simulators for the area, so that water and lava flows and sand falls into the blasted holes (FS #391):
-	m_World->GetSimulatorManager()->WakeUpArea(cCuboid(
+	m_World->GetSimulatorManager()->WakeUp(cCuboid(
 		{bx - ExplosionSizeInt - 1, MinY, bz - ExplosionSizeInt - 1},
 		{bx + ExplosionSizeInt + 1, MaxY, bz + ExplosionSizeInt + 1}
 	));
diff --git a/src/Protocol/ProtocolRecognizer.cpp b/src/Protocol/ProtocolRecognizer.cpp
index 813791485..81570ccd4 100644
--- a/src/Protocol/ProtocolRecognizer.cpp
+++ b/src/Protocol/ProtocolRecognizer.cpp
@@ -111,7 +111,6 @@ void cMultiVersionProtocol::HandleIncomingDataInRecognitionStage(cClientHandle &
 		// The protocol recogniser succesfully identified, switch mode:
 		HandleIncomingData = [this](cClientHandle &, const std::string_view a_In)
 		{
-			// TODO: make it take our a_ReceivedData
 			m_Protocol->DataReceived(m_Buffer, a_In.data(), a_In.size());
 		};
 	}
diff --git a/src/Simulator/DelayedFluidSimulator.cpp b/src/Simulator/DelayedFluidSimulator.cpp
index d4537656d..af9007548 100644
--- a/src/Simulator/DelayedFluidSimulator.cpp
+++ b/src/Simulator/DelayedFluidSimulator.cpp
@@ -78,19 +78,8 @@ cDelayedFluidSimulator::cDelayedFluidSimulator(cWorld & a_World, BLOCKTYPE a_Flu
 
 
 
-void cDelayedFluidSimulator::AddBlock(Vector3i a_Block, cChunk * a_Chunk)
+void cDelayedFluidSimulator::AddBlock(cChunk & a_Chunk, Vector3i a_Position, BLOCKTYPE a_Block)
 {
-	if ((a_Block.y < 0) || (a_Block.y >= cChunkDef::Height))
-	{
-		// Not inside the world (may happen when rclk with a full bucket - the client sends Y = -1)
-		return;
-	}
-
-	if ((a_Chunk == nullptr) || !a_Chunk->IsValid())
-	{
-		return;
-	}
-
 	int RelX = a_Block.x - a_Chunk->GetPosX() * cChunkDef::Width;
 	int RelZ = a_Block.z - a_Chunk->GetPosZ() * cChunkDef::Width;
 	BLOCKTYPE BlockType = a_Chunk->GetBlock(RelX, a_Block.y, RelZ);
@@ -156,3 +145,14 @@ void cDelayedFluidSimulator::SimulateChunk(std::chrono::milliseconds a_Dt, int a
 
 
 
+
+void cDelayedFluidSimulator::WakeUp(cChunk & a_Chunk, Vector3i a_Position, BLOCKTYPE a_Block)
+{
+	if (!cChunkDef::IsValidHeight(a_Position.y))
+	{
+		// Not inside the world (may happen when rclk with a full bucket - the client sends Y = -1)
+		return;
+	}
+
+	Super::WakeUp(a_Chunk, a_Position, a_Block);
+}
diff --git a/src/Simulator/DelayedFluidSimulator.h b/src/Simulator/DelayedFluidSimulator.h
index 4627cdce2..b3158efec 100644
--- a/src/Simulator/DelayedFluidSimulator.h
+++ b/src/Simulator/DelayedFluidSimulator.h
@@ -55,7 +55,8 @@ public:
 	cDelayedFluidSimulator(cWorld & a_World, BLOCKTYPE a_Fluid, BLOCKTYPE a_StationaryFluid, int a_TickDelay);
 
 	// cSimulator overrides:
-	virtual void AddBlock(Vector3i a_Block, cChunk * a_Chunk) override;
+	virtual void WakeUp(cChunk & a_Chunk, Vector3i a_Position, BLOCKTYPE a_Block) override;
+	virtual void AddBlock(cChunk & a_Chunk, Vector3i a_Position, BLOCKTYPE a_Block) override;
 	virtual void Simulate(float a_Dt) override;
 	virtual void SimulateChunk(std::chrono::milliseconds a_Dt, int a_ChunkX, int a_ChunkZ, cChunk * a_Chunk) override;
 	virtual cFluidSimulatorData * CreateChunkData(void) override { return new cDelayedFluidSimulatorChunkData(m_TickDelay); }
diff --git a/src/Simulator/FireSimulator.cpp b/src/Simulator/FireSimulator.cpp
index 3b53d5545..1f212e2a5 100644
--- a/src/Simulator/FireSimulator.cpp
+++ b/src/Simulator/FireSimulator.cpp
@@ -239,7 +239,7 @@ bool cFireSimulator::DoesBurnForever(BLOCKTYPE a_BlockType)
 
 
 
-void cFireSimulator::AddBlock(Vector3i a_Block, cChunk * a_Chunk)
+void cFireSimulator::AddBlock(cChunk & a_Chunk, Vector3i a_Position, BLOCKTYPE a_Block)
 {
 	if ((a_Chunk == nullptr) || !a_Chunk->IsValid())
 	{
diff --git a/src/Simulator/FireSimulator.h b/src/Simulator/FireSimulator.h
index f36407584..1bc6e7c0b 100644
--- a/src/Simulator/FireSimulator.h
+++ b/src/Simulator/FireSimulator.h
@@ -43,8 +43,7 @@ protected:
 	/** Chance [0..100000] of a fuel burning out being replaced by a new fire block instead of an air block */
 	int m_ReplaceFuelChance;
 
-
-	virtual void AddBlock(Vector3i a_Block, cChunk * a_Chunk) override;
+	virtual void AddBlock(cChunk & a_Chunk, Vector3i a_Position, BLOCKTYPE a_Block) override;
 
 	/** Returns the time [msec] after which the specified fire block is stepped again; based on surrounding fuels */
 	int GetBurnStepTime(cChunk * a_Chunk, Vector3i a_RelPos);
diff --git a/src/Simulator/IncrementalRedstoneSimulator/IncrementalRedstoneSimulator.cpp b/src/Simulator/IncrementalRedstoneSimulator/IncrementalRedstoneSimulator.cpp
index fdcd69069..33c0f9523 100644
--- a/src/Simulator/IncrementalRedstoneSimulator/IncrementalRedstoneSimulator.cpp
+++ b/src/Simulator/IncrementalRedstoneSimulator/IncrementalRedstoneSimulator.cpp
@@ -128,6 +128,53 @@ std::unique_ptr<cRedstoneHandler> cIncrementalRedstoneSimulator::CreateComponent
 
 
 
+void cIncrementalRedstoneSimulator::WakeUp(cChunk & a_Chunk, Vector3i a_Position, BLOCKTYPE a_Block)
+{
+	Super::WakeUp(a_Chunk, a_Position, a_Block);
+
+	auto & ChunkData = *static_cast<cIncrementalRedstoneSimulatorChunkData *>(a_Chunk.GetRedstoneSimulatorData());
+
+	// Never update blocks without a handler:
+	if (GetComponentHandler(a_Block) == nullptr)
+	{
+		ChunkData.ErasePowerData(a_Position);
+		return;
+	}
+
+	// Only update others if there is a redstone device nearby
+	for (int x = -1; x < 2; ++x)
+	{
+		for (int y = -1; y < 2; ++y)
+		{
+			if (!cChunkDef::IsValidHeight(a_Position.y + y))
+			{
+				continue;
+			}
+
+			for (int z = -1; z < 2; ++z)
+			{
+				auto CheckPos = a_Position + Vector3i{ x, y, z };
+				BLOCKTYPE Block;
+				NIBBLETYPE Meta;
+
+				// If we can't read the block, assume it is a mechanism
+				if (
+					!a_Chunk.UnboundedRelGetBlock(CheckPos, Block, Meta) ||
+					IsRedstone(Block)
+				)
+				{
+					ChunkData.WakeUp(a_Position);
+					return;
+				}
+			}
+		}
+	}
+}
+
+
+
+
+
 void cIncrementalRedstoneSimulator::SimulateChunk(std::chrono::milliseconds a_Dt, int a_ChunkX, int a_ChunkZ, cChunk * a_Chunk)
 {
 	auto & ChunkData = *static_cast<cIncrementalRedstoneSimulatorChunkData *>(a_Chunk->GetRedstoneSimulatorData());
@@ -224,7 +271,7 @@ void cIncrementalRedstoneSimulator::ProcessWorkItem(cChunk & Chunk, cChunk & Tic
 
 
 
-void cIncrementalRedstoneSimulator::AddBlock(Vector3i a_Block, cChunk * a_Chunk)
+void cIncrementalRedstoneSimulator::AddBlock(cChunk & a_Chunk, Vector3i a_Position, BLOCKTYPE a_Block)
 {
 	// Can't inspect block, ignore:
 	if ((a_Chunk == nullptr) || !a_Chunk->IsValid())
@@ -236,50 +283,16 @@ void cIncrementalRedstoneSimulator::AddBlock(Vector3i a_Block, cChunk * a_Chunk)
 	const auto Relative = cChunkDef::AbsoluteToRelative(a_Block, a_Chunk->GetPos());
 	const auto CurrentBlock = a_Chunk->GetBlock(Relative);
 
-	// Always update redstone devices
-	if (IsRedstone(CurrentBlock))
+	if (!IsRedstone(CurrentBlock))
 	{
-		if (IsAlwaysTicked(CurrentBlock))
-		{
-			ChunkData.AlwaysTickedPositions.emplace(Relative);
-		}
-		ChunkData.WakeUp(Relative);
 		return;
 	}
 
-	// Never update blocks without a handler
-	if (GetComponentHandler(CurrentBlock) == nullptr)
+	if (IsAlwaysTicked(CurrentBlock))
 	{
-		ChunkData.ErasePowerData(Relative);
-		return;
+		ChunkData.AlwaysTickedPositions.emplace(Relative);
 	}
 
-	// Only update others if there is a redstone device nearby
-	for (int x = -1; x < 2; ++x)
-	{
-		for (int y = -1; y < 2; ++y)
-		{
-			if (!cChunkDef::IsValidHeight(Relative.y + y))
-			{
-				continue;
-			}
-
-			for (int z = -1; z < 2; ++z)
-			{
-				auto CheckPos = Relative + Vector3i{x, y, z};
-				BLOCKTYPE Block;
-				NIBBLETYPE Meta;
-
-				// If we can't read the block, assume it is a mechanism
-				if (
-					!a_Chunk->UnboundedRelGetBlock(CheckPos, Block, Meta) ||
-					IsRedstone(Block)
-				)
-				{
-					ChunkData.WakeUp(Relative);
-					return;
-				}
-			}
-		}
-	}
+	// Always update redstone devices:
+	ChunkData.WakeUp(Relative);
 }
diff --git a/src/Simulator/IncrementalRedstoneSimulator/IncrementalRedstoneSimulator.h b/src/Simulator/IncrementalRedstoneSimulator/IncrementalRedstoneSimulator.h
index 3523463bd..7f1a6a9cf 100644
--- a/src/Simulator/IncrementalRedstoneSimulator/IncrementalRedstoneSimulator.h
+++ b/src/Simulator/IncrementalRedstoneSimulator/IncrementalRedstoneSimulator.h
@@ -21,6 +21,10 @@ public:
 	{
 	}
 
+private:
+
+	virtual void WakeUp(cChunk & a_Chunk, Vector3i a_Position, BLOCKTYPE a_Block) override;
+
 	virtual void Simulate(float Dt) override {};
 	virtual void SimulateChunk(std::chrono::milliseconds Dt, int ChunkX, int ChunkZ, cChunk * Chunk) override;
 
@@ -36,7 +40,7 @@ public:
 		return IsRedstone(a_BlockType);
 	}
 
-	virtual void AddBlock(Vector3i a_Block, cChunk * a_Chunk) override;
+	virtual void AddBlock(cChunk & a_Chunk, Vector3i a_Position, BLOCKTYPE a_Block) override;
 
 	/** Returns if a block is a mechanism (something that accepts power and does something)
 	Used by torches to determine if they will power a block */
diff --git a/src/Simulator/NoopFluidSimulator.h b/src/Simulator/NoopFluidSimulator.h
index 6fc8b3689..71c37d92d 100644
--- a/src/Simulator/NoopFluidSimulator.h
+++ b/src/Simulator/NoopFluidSimulator.h
@@ -28,7 +28,7 @@ public:
 	}
 
 	// cSimulator overrides:
-	virtual void AddBlock(Vector3i a_Block, cChunk * a_Chunk) override
+	virtual void AddBlock(cChunk & a_Chunk, Vector3i a_Position, BLOCKTYPE a_Block) override
 	{
 		UNUSED(a_Block);
 		UNUSED(a_Chunk);
diff --git a/src/Simulator/NoopRedstoneSimulator.h b/src/Simulator/NoopRedstoneSimulator.h
index 91436ce7e..8d47ceccf 100644
--- a/src/Simulator/NoopRedstoneSimulator.h
+++ b/src/Simulator/NoopRedstoneSimulator.h
@@ -28,7 +28,7 @@ public:
 		UNUSED(a_Chunk);
 	}
 	virtual bool IsAllowedBlock( BLOCKTYPE a_BlockType) override { return false; }
-	virtual void AddBlock(Vector3i a_Block, cChunk * a_Chunk) override
+	virtual void AddBlock(cChunk & a_Chunk, Vector3i a_Position, BLOCKTYPE a_Block) override
 	{
 		UNUSED(a_Block);
 		UNUSED(a_Chunk);
diff --git a/src/Simulator/RedstoneSimulator.h b/src/Simulator/RedstoneSimulator.h
index f90026374..6d60b91a2 100644
--- a/src/Simulator/RedstoneSimulator.h
+++ b/src/Simulator/RedstoneSimulator.h
@@ -31,11 +31,6 @@ public:
 	{
 	}
 
-	virtual void Simulate(float a_Dt) = 0;
-	virtual void SimulateChunk(std::chrono::milliseconds a_Dt, int a_ChunkX, int a_ChunkZ, cChunk * a_Chunk) = 0;
-	virtual bool IsAllowedBlock(BLOCKTYPE a_BlockType) = 0;
-	virtual void AddBlock(Vector3i a_Block, cChunk * a_Chunk) = 0;
-
 	virtual cRedstoneSimulatorChunkData * CreateChunkData() = 0;
 
 };
diff --git a/src/Simulator/SandSimulator.cpp b/src/Simulator/SandSimulator.cpp
index ee2c45520..ef02339bc 100644
--- a/src/Simulator/SandSimulator.cpp
+++ b/src/Simulator/SandSimulator.cpp
@@ -97,7 +97,7 @@ bool cSandSimulator::IsAllowedBlock(BLOCKTYPE a_BlockType)
 
 
 
-void cSandSimulator::AddBlock(Vector3i a_Block, cChunk * a_Chunk)
+void cSandSimulator::AddBlock(cChunk & a_Chunk, Vector3i a_Position, BLOCKTYPE a_Block)
 {
 	if ((a_Chunk == nullptr) || !a_Chunk->IsValid())
 	{
diff --git a/src/Simulator/SandSimulator.h b/src/Simulator/SandSimulator.h
index d7a27edd4..665208fbe 100644
--- a/src/Simulator/SandSimulator.h
+++ b/src/Simulator/SandSimulator.h
@@ -27,6 +27,7 @@ class cSandSimulator :
 	public cSimulator
 {
 public:
+
 	cSandSimulator(cWorld & a_World, cIniFile & a_IniFile);
 
 	// cSimulator overrides:
@@ -56,11 +57,12 @@ public:
 	);
 
 protected:
+
 	bool m_IsInstantFall;  // If set to true, blocks don't fall using cFallingBlock entity, but instantly instead
 
 	int  m_TotalBlocks;    // Total number of blocks currently in the queue for simulating
 
-	virtual void AddBlock(Vector3i a_Block, cChunk * a_Chunk) override;
+	virtual void AddBlock(cChunk & a_Chunk, Vector3i a_Position, BLOCKTYPE a_Block) override;
 
 	/** Performs the instant fall of the block - removes it from top, Finishes it at the bottom */
 	void DoInstantFall(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ);
diff --git a/src/Simulator/Simulator.cpp b/src/Simulator/Simulator.cpp
index ac2e757e4..e55b77f0f 100644
--- a/src/Simulator/Simulator.cpp
+++ b/src/Simulator/Simulator.cpp
@@ -1,33 +1,38 @@
 
 #include "Globals.h"
 
-#include "../World.h"
-#include "../Defines.h"
+#include "Simulator.h"
 #include "../Chunk.h"
 #include "../Cuboid.h"
+#include "../World.h"
 
-#ifdef __clang__
-	#pragma clang diagnostic ignored "-Wweak-template-vtables"
-#endif  // __clang__
 
 
 
-#include "Simulator.h"
 
+void cSimulator::WakeUp(cChunk & a_Chunk, Vector3i a_Position, BLOCKTYPE a_Block)
+{
+	ASSERT(a_Chunk.IsValid());
+
+	AddBlock(a_Chunk, a_Position, a_Block);
+}
 
 
 
 
-void cSimulator::WakeUp(Vector3i a_Block, cChunk * a_Chunk)
+
+void cSimulator::WakeUp(cChunk & a_Chunk, Vector3i a_Position, Vector3i a_Offset, BLOCKTYPE a_Block)
 {
-	AddBlock(a_Block, a_Chunk);
+	ASSERT(a_Chunk.IsValid());
+
+	WakeUp(a_Chunk, a_Position, a_Block);
 }
 
 
 
 
 
-void cSimulator::WakeUpArea(const cCuboid & a_Area)
+void cSimulator::WakeUp(const cCuboid & a_Area)
 {
 	cCuboid area(a_Area);
 	area.Sort();
@@ -60,7 +65,8 @@ void cSimulator::WakeUpArea(const cCuboid & a_Area)
 						{
 							for (int x = startX; x <= endX; ++x)
 							{
-								AddBlock({x, y, z}, &a_CBChunk);
+								const auto Position = cChunkDef::AbsoluteToRelative({ x, y, z });
+								AddBlock(a_CBChunk, Position, a_CBChunk.GetBlock(Position));
 							}  // for x
 						}  // for z
 					}  // for y
@@ -70,7 +76,3 @@ void cSimulator::WakeUpArea(const cCuboid & a_Area)
 		}  // for cx
 	}  // for cz
 }
-
-
-
-
diff --git a/src/Simulator/Simulator.h b/src/Simulator/Simulator.h
index 669680693..5bd5d8f30 100644
--- a/src/Simulator/Simulator.h
+++ b/src/Simulator/Simulator.h
@@ -19,6 +19,7 @@ may update its internal state based on this call. */
 class cSimulator
 {
 public:
+
 	cSimulator(cWorld & a_World)
 		: m_World(a_World)
 	{
@@ -26,10 +27,13 @@ public:
 
 	virtual ~cSimulator() {}
 
-	/** Called in each tick, a_Dt is the time passed since the last tick, in msec */
-	virtual void Simulate(float a_Dt) = 0;
+	virtual void WakeUp(cChunk & a_Chunk, Vector3i a_Position, BLOCKTYPE a_Block);
 
-	/** Called in each tick for each chunk, a_Dt is the time passed since the last tick, in msec; direct access to chunk data available */
+protected:
+
+	friend class cChunk;  // Calls AddBlock() in its WakeUpSimulators() function, to speed things up
+
+	virtual void Simulate(float a_Dt) = 0;
 	virtual void SimulateChunk(std::chrono::milliseconds a_Dt, int a_ChunkX, int a_ChunkZ, cChunk * a_Chunk)
 	{
 		UNUSED(a_Dt);
@@ -38,28 +42,26 @@ public:
 		UNUSED(a_Chunk);
 	}
 
-	/** Called when a block changes */
-	void WakeUp(Vector3i a_Block, cChunk * a_Chunk);
-
-	/** Does the same processing as WakeUp, but for all blocks within the specified area.
-	Has better performance than calling WakeUp for each block individually, due to neighbor-checking.
-	All chunks intersected by the area should be valid (outputs a warning if not).
-	Note that, unlike WakeUp(), this call adds blocks not only face-neighboring, but also edge-neighboring and
-	corner-neighboring the specified area. So far none of the simulators care about that. */
-	void WakeUpArea(const cCuboid & a_Area);
-
 	/** Returns true if the specified block type is "interesting" for this simulator. */
 	virtual bool IsAllowedBlock(BLOCKTYPE a_BlockType) = 0;
 
-protected:
-	friend class cChunk;  // Calls AddBlock() in its WakeUpSimulators() function, to speed things up
-
-	/** Called to simulate a new block */
-	virtual void AddBlock(Vector3i a_Block, cChunk * a_Chunk) = 0;
-
-	cWorld & m_World;
-} ;
+	/** Called to simulate a new block. Unlike WakeUp this function will perform minimal checking.
+	It queues the block to be simulated as fast as possible, only making sure that the block type IsAllowedBlock. */
+	virtual void AddBlock(cChunk & a_Chunk, Vector3i a_Position, BLOCKTYPE a_Block) = 0;
 
+	/** Called to simulate a single new block, typically as a result of a single block break or change.
+	The simulator implementation may decide to perform additional checks or maintain consistency of internal state
+	before the block is added to the simulate queue. */
+	virtual void WakeUp(cChunk & a_Chunk, Vector3i a_Position, BLOCKTYPE a_Block);
 
+	/** Called to simulate a single block, synthesised by the simulator manager.
+	The position represents the adjacents of the block that was actually changed, with the offset used given.
+	Simulators may use this information to update additional blocks that were affected by the change, or queue
+	farther, extra-adjacents blocks to be updated. The simulator manager calls this overload after the 3-argument WakeUp. */
+	virtual void WakeUp(cChunk & a_Chunk, Vector3i a_Position, Vector3i a_Offset, BLOCKTYPE a_Block);
 
+	/** Called to simulate an area by the manager, delegated to cSimulator to avoid virtual calls in tight loops. */
+	void WakeUp(const cCuboid & a_Area);
 
+	cWorld & m_World;
+} ;
diff --git a/src/Simulator/SimulatorManager.cpp b/src/Simulator/SimulatorManager.cpp
index a2740f707..f10c285e0 100644
--- a/src/Simulator/SimulatorManager.cpp
+++ b/src/Simulator/SimulatorManager.cpp
@@ -2,6 +2,7 @@
 #include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules
 
 #include "SimulatorManager.h"
+#include "../Chunk.h"
 #include "../World.h"
 
 
@@ -58,11 +59,13 @@ void cSimulatorManager::SimulateChunk(std::chrono::milliseconds a_Dt, int a_Chun
 
 
 
-void cSimulatorManager::WakeUp(Vector3i a_Block, cChunk * a_Chunk)
+void cSimulatorManager::WakeUp(cChunk & a_Chunk, Vector3i a_Position)
 {
+	ASSERT(a_Chunk.IsValid());
+
 	for (cSimulators::iterator itr = m_Simulators.begin(); itr != m_Simulators.end(); ++itr)
 	{
-		itr->first->WakeUp(a_Block, a_Chunk);
+		itr->first->WakeUp(a_Chunk, a_Position, a_Chunk.GetBlock(a_Position));
 	}
 }
 
@@ -70,11 +73,11 @@ void cSimulatorManager::WakeUp(Vector3i a_Block, cChunk * a_Chunk)
 
 
 
-void cSimulatorManager::WakeUpArea(const cCuboid & a_Area)
+void cSimulatorManager::WakeUp(const cCuboid & a_Area)
 {
-	for (cSimulators::iterator itr = m_Simulators.begin(); itr != m_Simulators.end(); ++itr)
+	for (const auto Item : m_Simulators)
 	{
-		itr->first->WakeUpArea(a_Area);
+		Item.first->WakeUp(a_Area);
 	}
 }
 
@@ -86,7 +89,3 @@ void cSimulatorManager::RegisterSimulator(cSimulator * a_Simulator, int a_Rate)
 {
 	m_Simulators.push_back(std::make_pair(a_Simulator, a_Rate));
 }
-
-
-
-
diff --git a/src/Simulator/SimulatorManager.h b/src/Simulator/SimulatorManager.h
index 98a60b4ee..b5f54381c 100644
--- a/src/Simulator/SimulatorManager.h
+++ b/src/Simulator/SimulatorManager.h
@@ -28,26 +28,30 @@ class cWorld;
 class cSimulatorManager
 {
 public:
+
 	cSimulatorManager(cWorld & a_World);
 	~cSimulatorManager();
 
+	/** Called in each tick, a_Dt is the time passed since the last tick, in msec. */
 	void Simulate(float a_Dt);
 
+	/** Called in each tick for each chunk, a_Dt is the time passed since the last tick, in msec; direct access to chunk data available. */
 	void SimulateChunk(std::chrono::milliseconds a_DT, int a_ChunkX, int a_ChunkZ, cChunk * a_Chunk);
 
-	/* Called when a single block changes, wakes all simulators up for the block and its face-neighbors. */
-	void WakeUp(Vector3i a_Block, cChunk * a_Chunk);
+	/* Called when a single block changes, wakes all simulators up for the block.
+	The simulator implementation may also decide to wake the block's face-neighbors or blocks farther away. */
+	void WakeUp(cChunk & a_Chunk, Vector3i a_Position);
 
 	/** Does the same processing as WakeUp, but for all blocks within the specified area.
 	Has better performance than calling WakeUp for each block individually, due to neighbor-checking.
 	All chunks intersected by the area should be valid (outputs a warning if not).
-	Note that, unlike WakeUp(), this call adds blocks not only face-neighboring, but also edge-neighboring and
-	corner-neighboring the specified area. So far none of the simulators care about that. */
-	void WakeUpArea(const cCuboid & a_Area);
+	Note that, unlike WakeUp(), this call adds blocks not only face-neighboring, but also edge-neighboring and corner-neighboring the specified area. */
+	void WakeUp(const cCuboid & a_Area);
 
 	void RegisterSimulator(cSimulator * a_Simulator, int a_Rate);  // Takes ownership of the simulator object!
 
 protected:
+
 	typedef std::vector <std::pair<cSimulator *, int> > cSimulators;
 
 	cWorld & m_World;
diff --git a/src/Simulator/VaporizeFluidSimulator.cpp b/src/Simulator/VaporizeFluidSimulator.cpp
index d0c590d16..8063a0706 100644
--- a/src/Simulator/VaporizeFluidSimulator.cpp
+++ b/src/Simulator/VaporizeFluidSimulator.cpp
@@ -22,7 +22,7 @@ cVaporizeFluidSimulator::cVaporizeFluidSimulator(cWorld & a_World, BLOCKTYPE a_F
 
 
 
-void cVaporizeFluidSimulator::AddBlock(Vector3i a_Block, cChunk * a_Chunk)
+void cVaporizeFluidSimulator::AddBlock(cChunk & a_Chunk, Vector3i a_Position, BLOCKTYPE a_Block)
 {
 	if (a_Chunk == nullptr)
 	{
diff --git a/src/Simulator/VaporizeFluidSimulator.h b/src/Simulator/VaporizeFluidSimulator.h
index d3ae28db3..2d259e56e 100644
--- a/src/Simulator/VaporizeFluidSimulator.h
+++ b/src/Simulator/VaporizeFluidSimulator.h
@@ -26,7 +26,7 @@ public:
 	cVaporizeFluidSimulator(cWorld & a_World, BLOCKTYPE a_Fluid, BLOCKTYPE a_StationaryFluid);
 
 	// cSimulator overrides:
-	virtual void AddBlock(Vector3i a_Block, cChunk * a_Chunk) override;
+	virtual void AddBlock(cChunk & a_Chunk, Vector3i a_Position, BLOCKTYPE a_Block) override;
 	virtual void Simulate(float a_Dt) override;
 } ;
 
diff --git a/src/World.cpp b/src/World.cpp
index d13081fb0..4de325d6e 100644
--- a/src/World.cpp
+++ b/src/World.cpp
@@ -1327,7 +1327,7 @@ void cWorld::WakeUpSimulatorsInArea(int a_MinBlockX, int a_MaxBlockX, int a_MinB
 
 void cWorld::WakeUpSimulatorsInArea(const cCuboid & a_Area)
 {
-	m_SimulatorManager->WakeUpArea(a_Area);
+	m_SimulatorManager->WakeUp(a_Area);
 }