1 files changed, 212 insertions, 0 deletions

diff --git a/src/Simulator/FluidSimulator.cpp b/src/Simulator/FluidSimulator.cpp
new file mode 100644
index 000000000..dac666484
--- /dev/null
+++ b/src/Simulator/FluidSimulator.cpp
@@ -0,0 +1,212 @@
+
+#include "Globals.h"
+
+#include "FluidSimulator.h"
+#include "../World.h"
+
+
+
+
+
+cFluidSimulator::cFluidSimulator(cWorld & a_World, BLOCKTYPE a_Fluid, BLOCKTYPE a_StationaryFluid) :
+	super(a_World),
+	m_FluidBlock(a_Fluid),
+	m_StationaryFluidBlock(a_StationaryFluid)
+{
+}
+
+
+
+
+
+bool cFluidSimulator::IsAllowedBlock(BLOCKTYPE a_BlockType)
+{
+	return ((a_BlockType == m_FluidBlock) || (a_BlockType == m_StationaryFluidBlock));
+}
+
+
+
+
+
+bool cFluidSimulator::CanWashAway(BLOCKTYPE a_BlockType)
+{
+	switch (a_BlockType)
+	{
+		case E_BLOCK_BROWN_MUSHROOM:
+		case E_BLOCK_CACTUS:
+		case E_BLOCK_COBWEB:
+		case E_BLOCK_CROPS:
+		case E_BLOCK_DEAD_BUSH:
+		case E_BLOCK_RAIL:
+		case E_BLOCK_REDSTONE_TORCH_OFF:
+		case E_BLOCK_REDSTONE_TORCH_ON:
+		case E_BLOCK_REDSTONE_WIRE:
+		case E_BLOCK_RED_MUSHROOM:
+		case E_BLOCK_RED_ROSE:
+		case E_BLOCK_SNOW:
+		case E_BLOCK_SUGARCANE:
+		case E_BLOCK_TALL_GRASS:
+		case E_BLOCK_TORCH:
+		case E_BLOCK_YELLOW_FLOWER:
+		{
+			return true;
+		}
+		default:
+		{
+			return false;
+		}
+	}
+}
+
+
+
+
+
+bool cFluidSimulator::IsSolidBlock(BLOCKTYPE a_BlockType)
+{
+	return !IsPassableForFluid(a_BlockType);
+}
+
+
+
+
+
+bool cFluidSimulator::IsPassableForFluid(BLOCKTYPE a_BlockType)
+{
+	return (
+		(a_BlockType == E_BLOCK_AIR) ||
+		(a_BlockType == E_BLOCK_FIRE) ||
+		IsAllowedBlock(a_BlockType) ||
+		CanWashAway(a_BlockType)
+	);
+}
+
+
+
+
+
+bool cFluidSimulator::IsHigherMeta(NIBBLETYPE a_Meta1, NIBBLETYPE a_Meta2)
+{
+	if (a_Meta1 == 0)
+	{
+		// Source block is higher than anything, even itself.
+		return true;
+	}
+	if ((a_Meta1 & 0x08) != 0)
+	{
+		// Falling fluid is higher than anything, including self
+		return true;
+	}
+	
+	if (a_Meta2 == 0)
+	{
+		// Second block is a source and first block isn't
+		return false;
+	}
+	if ((a_Meta2 & 0x08) != 0)
+	{
+		// Second block is falling and the first one is neither a source nor falling
+		return false;
+	}
+	
+	// All special cases have been handled, now it's just a raw comparison:
+	return (a_Meta1 < a_Meta2);
+}
+
+
+
+
+
+// TODO Not working very well yet :s
+Direction cFluidSimulator::GetFlowingDirection(int a_X, int a_Y, int a_Z, bool a_Over)
+{
+	if ((a_Y < 0) || (a_Y >= cChunkDef::Height))
+	{
+		return NONE;
+	}
+	BLOCKTYPE BlockID = m_World.GetBlock(a_X, a_Y, a_Z);
+	if (!IsAllowedBlock(BlockID))	// No Fluid -> No Flowing direction :D
+	{
+		return NONE;
+	}
+
+	/*
+	Disabled because of causing problems and being useless atm
+	char BlockBelow = m_World.GetBlock(a_X, a_Y - 1, a_Z);		//If there is nothing or fluid below it -> dominating flow is down :D
+	if (BlockBelow == E_BLOCK_AIR || IsAllowedBlock(BlockBelow))
+		return Y_MINUS;
+	*/
+
+	NIBBLETYPE LowestPoint = m_World.GetBlockMeta(a_X, a_Y, a_Z);	//Current Block Meta so only lower points will be counted
+	int X = 0, Y = 0, Z = 0;									//Lowest Pos will be stored here
+
+	if (IsAllowedBlock(m_World.GetBlock(a_X, a_Y + 1, a_Z)) && a_Over)		//check for upper block to flow because this also affects the flowing direction
+	{
+		return GetFlowingDirection(a_X, a_Y + 1, a_Z, false);
+	}
+
+	std::vector< Vector3i * > Points;
+
+	Points.reserve(4);	//Already allocate 4 places :D
+
+	//add blocks around the checking pos
+	Points.push_back(new Vector3i(a_X - 1, a_Y, a_Z));
+	Points.push_back(new Vector3i(a_X + 1, a_Y, a_Z));
+	Points.push_back(new Vector3i(a_X, a_Y, a_Z + 1));
+	Points.push_back(new Vector3i(a_X, a_Y, a_Z - 1));
+
+	for (std::vector<Vector3i *>::iterator it = Points.begin(); it < Points.end(); it++)
+	{
+		Vector3i *Pos = (*it);
+		char BlockID = m_World.GetBlock(Pos->x, Pos->y, Pos->z);
+		if(IsAllowedBlock(BlockID))
+		{
+			char Meta = m_World.GetBlockMeta(Pos->x, Pos->y, Pos->z);
+
+			if(Meta > LowestPoint)
+			{
+				LowestPoint = Meta;
+				X = Pos->x;
+				Y = Pos->y;
+				Z = Pos->z;
+			}
+		}else if(BlockID == E_BLOCK_AIR)
+		{
+			LowestPoint = 9;		//This always dominates
+			X = Pos->x;
+			Y = Pos->y;
+			Z = Pos->z;
+		
+		}
+		delete Pos;
+	}
+
+	if (LowestPoint == m_World.GetBlockMeta(a_X, a_Y, a_Z))
+		return NONE;
+
+	if (a_X - X > 0)
+	{
+		return X_MINUS;
+	}
+
+	if (a_X - X < 0)
+	{
+		return X_PLUS;
+	}
+
+	if (a_Z - Z > 0)
+	{
+		return Z_MINUS;
+	}
+
+	if (a_Z - Z < 0)
+	{
+		return Z_PLUS;
+	}
+
+	return NONE;
+}
+
+
+
+