Preparation for multiple fluid simulators.

Moved all simulators into a subfolder.
Replaced cWaterSimulator and cLavaSimulator with a generic cFluidSimulator.
Moved original fluid simulation into cClassicFluidSimulator.
Fluid simulator parameters (MaxHeight, Falloff) are read from the world.ini file (can have nether-like lava with lower falloff)

git-svn-id: http://mc-server.googlecode.com/svn/trunk@956 0a769ca7-a7f5-676a-18bf-c427514a06d6

source/Simulator/SandSimulator.cpp

@@ -0,0 +1,101 @@
+
+#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules
+
+#include "SandSimulator.h"
+#include "../World.h"
+#include "../BlockID.h"
+#include "../Defines.h"
+#include "../FallingBlock.h"
+
+
+
+
+cSandSimulator::cSandSimulator( cWorld* a_World )
+	: cSimulator(a_World)
+	, m_Blocks(new BlockList)
+	, m_Buffer(new BlockList)
+{
+
+}
+
+
+
+
+
+cSandSimulator::~cSandSimulator()
+{
+	delete m_Buffer;
+	delete m_Blocks;
+}
+
+
+
+
+
+void cSandSimulator::Simulate( float a_Dt )
+{
+	m_Buffer->clear();
+	std::swap( m_Blocks, m_Buffer );
+
+	for( BlockList::iterator itr = m_Buffer->begin(); itr != m_Buffer->end(); ++itr )
+	{
+		Vector3i Pos = *itr;
+		BLOCKTYPE BlockID = m_World->GetBlock(Pos.x, Pos.y, Pos.z);
+		if(!IsAllowedBlock(BlockID))
+			continue;
+
+		BLOCKTYPE BottomBlock = m_World->GetBlock( Pos.x, Pos.y - 1, Pos.z );
+		
+		if( IsPassable(BottomBlock) )
+		{
+			cFallingBlock * FallingBlock = new cFallingBlock( Pos, BlockID );
+			FallingBlock->Initialize( m_World );
+ 			m_World->SetBlock( Pos.x, Pos.y, Pos.z, E_BLOCK_AIR, 0 );
+		}
+	}
+		
+}
+
+
+
+
+
+bool cSandSimulator::IsAllowedBlock( BLOCKTYPE a_BlockType )
+{
+	return a_BlockType == E_BLOCK_SAND
+		|| a_BlockType == E_BLOCK_GRAVEL;
+}
+
+
+
+
+
+void cSandSimulator::AddBlock(int a_X, int a_Y, int a_Z)
+{
+	if(!IsAllowedBlock(m_World->GetBlock(a_X, a_Y, a_Z)))
+		return;
+
+	Vector3i Block(a_X, a_Y, a_Z);
+	
+	//check for duplicates
+	for( BlockList::iterator itr = m_Blocks->begin(); itr != m_Blocks->end(); ++itr )
+	{
+		Vector3i Pos = *itr;
+		if( Pos.x == a_X && Pos.y == a_Y && Pos.z == a_Z )
+			return;
+	}
+
+	m_Blocks->push_back(Block);
+}
+
+
+
+
+
+bool cSandSimulator::IsPassable( BLOCKTYPE a_BlockType )
+{
+	return a_BlockType == E_BLOCK_AIR
+		|| IsBlockWater(a_BlockType)
+		|| IsBlockLava(a_BlockType)
+		|| a_BlockType == E_BLOCK_FIRE;
+}