11 files changed, 330 insertions, 29 deletions

diff --git a/src/Simulator/DelayedFluidSimulator.cpp b/src/Simulator/DelayedFluidSimulator.cpp
index 3d2170e44..bc5158d95 100644
--- a/src/Simulator/DelayedFluidSimulator.cpp
+++ b/src/Simulator/DelayedFluidSimulator.cpp
@@ -20,7 +20,7 @@
 bool cDelayedFluidSimulatorChunkData::cSlot::Add(int a_RelX, int a_RelY, int a_RelZ)
 {
 	ASSERT(a_RelZ >= 0);
-	ASSERT(a_RelZ < ARRAYCOUNT(m_Blocks));
+	ASSERT(a_RelZ < static_cast<int>(ARRAYCOUNT(m_Blocks)));
 	
 	cCoordWithIntVector & Blocks = m_Blocks[a_RelZ];
 	int Index = cChunkDef::MakeIndexNoCheck(a_RelX, a_RelY, a_RelZ);
diff --git a/src/Simulator/FireSimulator.cpp b/src/Simulator/FireSimulator.cpp
index 85190c82b..470dfc791 100644
--- a/src/Simulator/FireSimulator.cpp
+++ b/src/Simulator/FireSimulator.cpp
@@ -6,6 +6,8 @@
 #include "../BlockID.h"
 #include "../Defines.h"
 #include "../Chunk.h"
+#include "Root.h"
+#include "../Bindings/PluginManager.h"
 
 
 
@@ -252,7 +254,7 @@ int cFireSimulator::GetBurnStepTime(cChunk * a_Chunk, int a_RelX, int a_RelY, in
 		{
 			return m_BurnStepTimeFuel;
 		}
-		IsBlockBelowSolid = g_BlockIsSolid[BlockBelow];
+		IsBlockBelowSolid = cBlockInfo::IsSolid(BlockBelow);
 	}
 	
 	for (size_t i = 0; i < ARRAYCOUNT(gCrossCoords); i++)
@@ -315,9 +317,15 @@ void cFireSimulator::TrySpreadFire(cChunk * a_Chunk, int a_RelX, int a_RelY, int
 				*/
 				if (CanStartFireInBlock(a_Chunk, x, y, z))
 				{
-					FLOG("FS: Starting new fire at {%d, %d, %d}.", 
-						x + a_Chunk->GetPosX() * cChunkDef::Width, y, z + a_Chunk->GetPosZ() * cChunkDef::Width
-					);
+					int a_PosX = x + a_Chunk->GetPosX() * cChunkDef::Width;
+					int a_PosZ = z + a_Chunk->GetPosZ() * cChunkDef::Width;
+					
+					if (cRoot::Get()->GetPluginManager()->CallHookBlockSpread(&m_World, a_PosX, y, a_PosZ, ssFireSpread))
+					{
+						return;
+					}
+					
+					FLOG("FS: Starting new fire at {%d, %d, %d}.", a_PosX, y, a_PosZ);
 					a_Chunk->UnboundedRelSetBlock(x, y, z, E_BLOCK_FIRE, 0);
 				}
 			}  // for y
@@ -334,21 +342,33 @@ void cFireSimulator::RemoveFuelNeighbors(cChunk * a_Chunk, int a_RelX, int a_Rel
 	for (size_t i = 0; i < ARRAYCOUNT(gNeighborCoords); i++)
 	{
 		BLOCKTYPE  BlockType;
-		NIBBLETYPE BlockMeta;
-		if (!a_Chunk->UnboundedRelGetBlock(a_RelX + gNeighborCoords[i].x, a_RelY + gNeighborCoords[i].y, a_RelZ + gNeighborCoords[i].z, BlockType, BlockMeta))
+		int X = a_RelX + gNeighborCoords[i].x;
+		int Z = a_RelZ + gNeighborCoords[i].z;
+
+		cChunkPtr Neighbour = a_Chunk->GetRelNeighborChunkAdjustCoords(X, Z);
+		if (Neighbour == NULL)
 		{
-			// Neighbor not accessible, ignore it
 			continue;
 		}
+		BlockType = Neighbour->GetBlock(X, a_RelY + gCrossCoords[i].y, Z);
+
 		if (!IsFuel(BlockType))
 		{
 			continue;
 		}
+
+		if (BlockType == E_BLOCK_TNT)
+		{
+			int AbsX = X + Neighbour->GetPosX() * cChunkDef::Width;
+			int AbsZ = Z + Neighbour->GetPosZ() * cChunkDef::Width;
+
+			m_World.SpawnPrimedTNT(AbsX, a_RelY + gNeighborCoords[i].y, AbsZ, 0);
+			Neighbour->SetBlock(X, a_RelY + gNeighborCoords[i].y, Z, E_BLOCK_AIR, 0);
+			return;
+		}
+
 		bool ShouldReplaceFuel = (m_World.GetTickRandomNumber(MAX_CHANCE_REPLACE_FUEL) < m_ReplaceFuelChance);
-		a_Chunk->UnboundedRelSetBlock(
-			a_RelX + gNeighborCoords[i].x, a_RelY + gNeighborCoords[i].y, a_RelZ + gNeighborCoords[i].z,
-			ShouldReplaceFuel ? E_BLOCK_FIRE : E_BLOCK_AIR, 0
-		);
+		Neighbour->SetBlock(X, a_RelY + gNeighborCoords[i].y, Z, ShouldReplaceFuel ? E_BLOCK_FIRE : E_BLOCK_AIR, 0);
 	}  // for i - Coords[]
 }
 
diff --git a/src/Simulator/FloodyFluidSimulator.cpp b/src/Simulator/FloodyFluidSimulator.cpp
index 95182345c..03e94e791 100644
--- a/src/Simulator/FloodyFluidSimulator.cpp
+++ b/src/Simulator/FloodyFluidSimulator.cpp
@@ -54,14 +54,23 @@ void cFloodyFluidSimulator::SimulateBlock(cChunk * a_Chunk, int a_RelX, int a_Re
 		a_Chunk->GetMeta(a_RelX, a_RelY, a_RelZ)
 	);
 	
-	NIBBLETYPE MyMeta = a_Chunk->GetMeta(a_RelX, a_RelY, a_RelZ);
-	if (!IsAnyFluidBlock(a_Chunk->GetBlock(a_RelX, a_RelY, a_RelZ)))
+	BLOCKTYPE MyBlock; NIBBLETYPE MyMeta;
+	a_Chunk->GetBlockTypeMeta(a_RelX, a_RelY, a_RelZ, MyBlock, MyMeta);
+
+	if (!IsAnyFluidBlock(MyBlock))
 	{
 		// Can happen - if a block is scheduled for simulating and gets replaced in the meantime.
 		FLOG("  BadBlockType exit");
 		return;
 	}
 
+	// When in contact with water, lava should harden
+	if (HardenBlock(a_Chunk, a_RelX, a_RelY, a_RelZ, MyBlock, MyMeta))
+	{
+		// Block was changed, bail out
+		return;
+	}
+
 	if (MyMeta != 0)
 	{
 		// Source blocks aren't checked for tributaries, others are.
@@ -86,7 +95,12 @@ void cFloodyFluidSimulator::SimulateBlock(cChunk * a_Chunk, int a_RelX, int a_Re
 		{
 			// Spread only down, possibly washing away what's there or turning lava to stone / cobble / obsidian:
 			SpreadToNeighbor(a_Chunk, a_RelX, a_RelY - 1, a_RelZ, 8);
-			SpreadFurther = false;
+
+			// Source blocks spread both downwards and sideways
+			if (MyMeta != 0)
+			{
+				SpreadFurther = false;
+			}
 		}
 		// If source creation is on, check for it here:
 		else if (
@@ -105,10 +119,7 @@ void cFloodyFluidSimulator::SimulateBlock(cChunk * a_Chunk, int a_RelX, int a_Re
 	if (SpreadFurther && (NewMeta < 8))
 	{
 		// Spread to the neighbors:
-		SpreadToNeighbor(a_Chunk, a_RelX - 1, a_RelY, a_RelZ,     NewMeta);
-		SpreadToNeighbor(a_Chunk, a_RelX + 1, a_RelY, a_RelZ,     NewMeta);
-		SpreadToNeighbor(a_Chunk, a_RelX,     a_RelY, a_RelZ - 1, NewMeta);
-		SpreadToNeighbor(a_Chunk, a_RelX,     a_RelY, a_RelZ + 1, NewMeta);
+		Spread(a_Chunk, a_RelX, a_RelY, a_RelZ, NewMeta);
 	}
 	
 	// Mark as processed:
@@ -119,6 +130,17 @@ void cFloodyFluidSimulator::SimulateBlock(cChunk * a_Chunk, int a_RelX, int a_Re
 
 
 
+void cFloodyFluidSimulator::Spread(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ, NIBBLETYPE a_NewMeta)
+{
+	SpreadToNeighbor(a_Chunk, a_RelX - 1, a_RelY, a_RelZ,     a_NewMeta);
+	SpreadToNeighbor(a_Chunk, a_RelX + 1, a_RelY, a_RelZ,     a_NewMeta);
+	SpreadToNeighbor(a_Chunk, a_RelX,     a_RelY, a_RelZ - 1, a_NewMeta);
+	SpreadToNeighbor(a_Chunk, a_RelX,     a_RelY, a_RelZ + 1, a_NewMeta);
+}
+
+
+
+
 bool cFloodyFluidSimulator::CheckTributaries(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ, NIBBLETYPE a_MyMeta)
 {
 	// If we have a section above, check if there's fluid above this block that would feed it:
@@ -296,6 +318,8 @@ void cFloodyFluidSimulator::SpreadToNeighbor(cChunk * a_NearChunk, int a_RelX, i
 		a_NewMeta
 	);
 	a_NearChunk->UnboundedRelSetBlock(a_RelX, a_RelY, a_RelZ, m_FluidBlock, a_NewMeta);
+
+	HardenBlock(a_NearChunk, a_RelX, a_RelY, a_RelZ, m_FluidBlock, a_NewMeta);
 }
 
 
@@ -348,3 +372,56 @@ bool cFloodyFluidSimulator::CheckNeighborsForSource(cChunk * a_Chunk, int a_RelX
 
 
 
+
+bool cFloodyFluidSimulator::HardenBlock(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_Meta)
+{
+	// Only lava blocks can harden
+	if (!IsBlockLava(a_BlockType))
+	{
+		return false;
+	}
+
+	bool ShouldHarden = false;
+
+	BLOCKTYPE BlockType;
+	NIBBLETYPE BlockMeta;
+	static const Vector3i Coords[] =
+	{
+		Vector3i( 1, 0,  0),
+		Vector3i(-1, 0,  0),
+		Vector3i( 0, 0,  1),
+		Vector3i( 0, 0, -1),
+	};
+	for (size_t i = 0; i < ARRAYCOUNT(Coords); i++)
+	{
+		if (!a_Chunk->UnboundedRelGetBlock(a_RelX + Coords[i].x, a_RelY, a_RelZ + Coords[i].z, BlockType, BlockMeta))
+		{
+			continue;
+		}
+		if (IsBlockWater(BlockType))
+		{
+			ShouldHarden = true;
+		}
+	}  // for i - Coords[]
+
+	if (ShouldHarden)
+	{
+		if (a_Meta == 0)
+		{
+			// Source lava block
+			a_Chunk->UnboundedRelSetBlock(a_RelX, a_RelY, a_RelZ, E_BLOCK_OBSIDIAN, 0);
+			return true;
+		}
+		// Ignore last lava level
+		else if (a_Meta <= 4)
+		{
+			a_Chunk->UnboundedRelSetBlock(a_RelX, a_RelY, a_RelZ, E_BLOCK_COBBLESTONE, 0);
+			return true;
+		}
+	}
+
+	return false;
+}
+
+
+
diff --git a/src/Simulator/FloodyFluidSimulator.h b/src/Simulator/FloodyFluidSimulator.h
index c4af2e246..632de3bb2 100644
--- a/src/Simulator/FloodyFluidSimulator.h
+++ b/src/Simulator/FloodyFluidSimulator.h
@@ -38,14 +38,26 @@ protected:
 	// cDelayedFluidSimulator overrides:
 	virtual void SimulateBlock(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ) override;
 	
-	/// Checks tributaries, if not fed, decreases the block's level and returns true
+	/** Checks tributaries, if not fed, decreases the block's level and returns true. */
 	bool CheckTributaries(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ, NIBBLETYPE a_MyMeta);
 
-	/// Spreads into the specified block, if the blocktype there allows. a_Area is for checking.
+	/** Spreads into the specified block, if the blocktype there allows. a_Area is for checking. */
 	void SpreadToNeighbor(cChunk * a_NearChunk, int a_RelX, int a_RelY, int a_RelZ, NIBBLETYPE a_NewMeta);
 	
-	/// Checks if there are enough neighbors to create a source at the coords specified; turns into source and returns true if so
+	/** Checks if there are enough neighbors to create a source at the coords specified; turns into source and returns true if so. */
 	bool CheckNeighborsForSource(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ);
+
+	/** Checks if the specified block should harden (Water/Lava interaction) and if so, converts it to a suitable block.
+	 *
+	 * Returns whether the block was changed or not.
+	 */
+	bool HardenBlock(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_Meta);
+
+	/** Spread water to neighbors.
+	 *
+	 * May be overridden to provide more sophisticated algorithms.
+	 */
+	virtual void Spread(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ, NIBBLETYPE a_NewMeta);
 } ;
 
 
diff --git a/src/Simulator/FluidSimulator.cpp b/src/Simulator/FluidSimulator.cpp
index 61c93ed73..7779573d7 100644
--- a/src/Simulator/FluidSimulator.cpp
+++ b/src/Simulator/FluidSimulator.cpp
@@ -36,6 +36,7 @@ bool cFluidSimulator::CanWashAway(BLOCKTYPE a_BlockType)
 		case E_BLOCK_COBWEB:
 		case E_BLOCK_CROPS:
 		case E_BLOCK_DEAD_BUSH:
+		case E_BLOCK_LILY_PAD:
 		case E_BLOCK_RAIL:
 		case E_BLOCK_REDSTONE_TORCH_OFF:
 		case E_BLOCK_REDSTONE_TORCH_ON:
diff --git a/src/Simulator/IncrementalRedstoneSimulator.cpp b/src/Simulator/IncrementalRedstoneSimulator.cpp
index 74b30f920..92659fab7 100644
--- a/src/Simulator/IncrementalRedstoneSimulator.cpp
+++ b/src/Simulator/IncrementalRedstoneSimulator.cpp
@@ -566,14 +566,14 @@ void cIncrementalRedstoneSimulator::HandleRedstoneWire(int a_BlockX, int a_Block
 		{
 			if ((i >= 4) && (i <= 7)) // If we are currently checking for wire surrounding ourself one block above...
 			{
-				if (g_BlockIsSolid[m_World.GetBlock(a_BlockX, a_BlockY + 1, a_BlockZ)]) // If there is something solid above us (wire cut off)...
+				if (cBlockInfo::IsSolid(m_World.GetBlock(a_BlockX, a_BlockY + 1, a_BlockZ))) // If there is something solid above us (wire cut off)...
 				{
 					continue; // We don't receive power from that wire
 				}
 			}
 			else if ((i >= 8) && (i <= 11)) // See above, but this is for wire below us
 			{
-				if (g_BlockIsSolid[m_World.GetBlock(a_BlockX + gCrossCoords[i].x, a_BlockY + gCrossCoords[i].y + 1, a_BlockZ + gCrossCoords[i].z)])
+				if (cBlockInfo::IsSolid(m_World.GetBlock(a_BlockX + gCrossCoords[i].x, a_BlockY + gCrossCoords[i].y + 1, a_BlockZ + gCrossCoords[i].z)))
 				{
 					continue;
 				}
@@ -838,8 +838,8 @@ void cIncrementalRedstoneSimulator::HandleTNT(int a_BlockX, int a_BlockY, int a_
 	if (AreCoordsPowered(a_BlockX, a_BlockY, a_BlockZ))
 	{
 		m_World.BroadcastSoundEffect("game.tnt.primed", a_BlockX * 8, a_BlockY * 8, a_BlockZ * 8, 0.5f, 0.6f);
-		m_World.SpawnPrimedTNT(a_BlockX + 0.5, a_BlockY + 0.5, a_BlockZ + 0.5, 4);  // 4 seconds to boom
 		m_World.SetBlock(a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_AIR, 0);
+		m_World.SpawnPrimedTNT(a_BlockX + 0.5, a_BlockY + 0.5, a_BlockZ + 0.5);  // 80 ticks to boom
 	}
 }
 
@@ -1062,7 +1062,7 @@ void cIncrementalRedstoneSimulator::HandlePressurePlate(int a_BlockX, int a_Bloc
 				{
 					Vector3f EntityPos = a_Entity->GetPosition();
 					Vector3f BlockPos(m_X + 0.5f, (float)m_Y, m_Z + 0.5f);
-					float Distance = (EntityPos - BlockPos).Length();
+					double Distance = (EntityPos - BlockPos).Length();
 
 					if (Distance <= 0.7)
 					{
diff --git a/src/Simulator/IncrementalRedstoneSimulator.h b/src/Simulator/IncrementalRedstoneSimulator.h
index e6bc28621..8b7363366 100644
--- a/src/Simulator/IncrementalRedstoneSimulator.h
+++ b/src/Simulator/IncrementalRedstoneSimulator.h
@@ -170,7 +170,7 @@ private:
 
 	/* ====== Misc Functions ====== */
 	/** Returns if a block is viable to be the MiddleBlock of a SetLinkedPowered operation */
-	inline static bool IsViableMiddleBlock(BLOCKTYPE Block) { return g_BlockFullyOccupiesVoxel[Block]; }
+	inline static bool IsViableMiddleBlock(BLOCKTYPE Block) { return cBlockInfo::FullyOccupiesVoxel(Block); }
 
 	/** Returns if a block is a mechanism (something that accepts power and does something) */
 	inline static bool IsMechanism(BLOCKTYPE Block)
diff --git a/src/Simulator/Simulator.cpp b/src/Simulator/Simulator.cpp
index 06fd0f858..0739f0187 100644
--- a/src/Simulator/Simulator.cpp
+++ b/src/Simulator/Simulator.cpp
@@ -3,7 +3,6 @@
 
 #include "Simulator.h"
 #include "../World.h"
-#include "../Vector3i.h"
 #include "../BlockID.h"
 #include "../Defines.h"
 #include "../Chunk.h"
diff --git a/src/Simulator/Simulator.h b/src/Simulator/Simulator.h
index a25b7f1b6..a2e2a5742 100644
--- a/src/Simulator/Simulator.h
+++ b/src/Simulator/Simulator.h
@@ -1,7 +1,7 @@
 
 #pragma once
 
-#include "../Vector3i.h"
+#include "../Vector3.h"
 #include "inifile/iniFile.h"
 
 
diff --git a/src/Simulator/VanillaFluidSimulator.cpp b/src/Simulator/VanillaFluidSimulator.cpp
new file mode 100644
index 000000000..78aff9d68
--- /dev/null
+++ b/src/Simulator/VanillaFluidSimulator.cpp
@@ -0,0 +1,150 @@
+
+// VanillaFluidSimulator.cpp
+
+#include "Globals.h"
+
+#include "VanillaFluidSimulator.h"
+#include "../World.h"
+#include "../Chunk.h"
+#include "../BlockArea.h"
+#include "../Blocks/BlockHandler.h"
+#include "../BlockInServerPluginInterface.h"
+
+
+
+
+
+static const int InfiniteCost = 100;
+
+
+
+
+
+cVanillaFluidSimulator::cVanillaFluidSimulator(
+	cWorld & a_World,
+	BLOCKTYPE a_Fluid,
+	BLOCKTYPE a_StationaryFluid,
+	NIBBLETYPE a_Falloff,
+	int a_TickDelay,
+	int a_NumNeighborsForSource
+) : super(a_World, a_Fluid, a_StationaryFluid, a_Falloff, a_TickDelay, a_NumNeighborsForSource)
+{
+}
+
+
+
+
+
+void cVanillaFluidSimulator::Spread(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ, NIBBLETYPE a_NewMeta)
+{
+	int Cost[4];
+	Cost[0] = CalculateFlowCost(a_Chunk, a_RelX + 1, a_RelY, a_RelZ,     X_PLUS);
+	Cost[1] = CalculateFlowCost(a_Chunk, a_RelX - 1, a_RelY, a_RelZ,     X_MINUS);
+	Cost[2] = CalculateFlowCost(a_Chunk, a_RelX,     a_RelY, a_RelZ + 1, Z_PLUS);
+	Cost[3] = CalculateFlowCost(a_Chunk, a_RelX,     a_RelY, a_RelZ - 1, Z_MINUS);
+
+	int MinCost = InfiniteCost;
+	for (unsigned int i = 0; i < ARRAYCOUNT(Cost); ++i)
+	{
+		if (Cost[i] < MinCost)
+		{
+			MinCost = Cost[i];
+		}
+	}
+
+	if (Cost[0] == MinCost)
+	{
+		SpreadToNeighbor(a_Chunk, a_RelX + 1, a_RelY, a_RelZ, a_NewMeta);
+	}
+	if (Cost[1] == MinCost)
+	{
+		SpreadToNeighbor(a_Chunk, a_RelX - 1, a_RelY, a_RelZ, a_NewMeta);
+	}
+	if (Cost[2] == MinCost)
+	{
+		SpreadToNeighbor(a_Chunk, a_RelX, a_RelY, a_RelZ + 1, a_NewMeta);
+	}
+	if (Cost[3] == MinCost)
+	{
+		SpreadToNeighbor(a_Chunk, a_RelX, a_RelY, a_RelZ - 1, a_NewMeta);
+	}
+}
+
+
+
+
+
+int cVanillaFluidSimulator::CalculateFlowCost(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ, Direction a_Dir, unsigned a_Iteration)
+{
+	int Cost = InfiniteCost;
+
+	BLOCKTYPE BlockType;
+	NIBBLETYPE BlockMeta;
+
+	// Check if block is passable
+	if (!a_Chunk->UnboundedRelGetBlock(a_RelX, a_RelY, a_RelZ, BlockType, BlockMeta))
+	{
+		return Cost;
+	}
+	if (!IsPassableForFluid(BlockType) && !IsBlockLiquid(BlockType))
+	{
+		return Cost;
+	}
+
+	// Check if block below is passable
+	if (!a_Chunk->UnboundedRelGetBlock(a_RelX, a_RelY - 1, a_RelZ, BlockType, BlockMeta))
+	{
+		return Cost;
+	}
+	if (IsPassableForFluid(BlockType) || IsBlockLiquid(BlockType))
+	{
+		// Path found, exit
+		return a_Iteration;
+	}
+
+	// 5 blocks away, bail out
+	if (a_Iteration > 3)
+	{
+		return Cost;
+	}
+
+	// Recurse
+	if (a_Dir != X_MINUS)
+	{
+		int NextCost = CalculateFlowCost(a_Chunk, a_RelX + 1, a_RelY, a_RelZ, X_PLUS, a_Iteration + 1);
+		if (NextCost < Cost)
+		{
+			Cost = NextCost;
+		}
+	}
+	if (a_Dir != X_PLUS)
+	{
+		int NextCost = CalculateFlowCost(a_Chunk, a_RelX - 1, a_RelY, a_RelZ, X_MINUS, a_Iteration + 1);
+		if (NextCost < Cost)
+		{
+			Cost = NextCost;
+		}
+	}
+	if (a_Dir != Z_MINUS)
+	{
+		int NextCost = CalculateFlowCost(a_Chunk, a_RelX, a_RelY, a_RelZ + 1, Z_PLUS, a_Iteration + 1);
+		if (NextCost < Cost)
+		{
+			Cost = NextCost;
+		}
+	}
+	if (a_Dir != Z_PLUS)
+	{
+		int NextCost = CalculateFlowCost(a_Chunk, a_RelX, a_RelY, a_RelZ - 1, Z_MINUS, a_Iteration + 1);
+		if (NextCost < Cost)
+		{
+			Cost = NextCost;
+		}
+	}
+
+	return Cost;
+}
+
+
+
+
diff --git a/src/Simulator/VanillaFluidSimulator.h b/src/Simulator/VanillaFluidSimulator.h
new file mode 100644
index 000000000..a9ea98b5a
--- /dev/null
+++ b/src/Simulator/VanillaFluidSimulator.h
@@ -0,0 +1,42 @@
+
+// VanillaFluidSimulator.h
+
+
+
+
+
+#pragma once
+
+#include "FloodyFluidSimulator.h"
+
+
+
+
+
+// fwd:
+class cBlockArea;
+
+
+
+
+
+class cVanillaFluidSimulator :
+	public cFloodyFluidSimulator
+{
+	typedef cFloodyFluidSimulator super;
+	
+public:
+	cVanillaFluidSimulator(cWorld & a_World, BLOCKTYPE a_Fluid, BLOCKTYPE a_StationaryFluid, NIBBLETYPE a_Falloff, int a_TickDelay, int a_NumNeighborsForSource);
+	
+protected:
+	// cFloodyFluidSimulator overrides:
+	virtual void Spread(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ, NIBBLETYPE a_NewMeta) override;
+
+	/** Recursively calculates the minimum number of blocks needed to descend a level. */
+	int CalculateFlowCost(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ, Direction a_Dir, unsigned a_Iteration = 0);
+
+} ;
+
+
+
+