1 files changed, 91 insertions, 0 deletions

diff --git a/source/SandSimulator.cpp b/source/SandSimulator.cpp
new file mode 100644
index 000000000..1dd9d3d88
--- /dev/null
+++ b/source/SandSimulator.cpp
@@ -0,0 +1,91 @@
+
+#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules
+
+#include "SandSimulator.h"
+#include "World.h"
+#include "Vector3i.h"
+#include "BlockID.h"
+#include "Defines.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;
+		char BlockID = m_World->GetBlock(Pos.x, Pos.y, Pos.z);
+		if(!IsAllowedBlock(BlockID))
+			continue;
+
+		char BottomBlock = m_World->GetBlock( Pos.x, Pos.y - 1, Pos.z );
+		
+		if( IsPassable(BottomBlock) )
+		{
+			m_World->SetBlock( Pos.x, Pos.y, Pos.z, E_BLOCK_AIR, 0 );
+			m_World->SetBlock( Pos.x, Pos.y - 1, Pos.z, BlockID, 0 );
+		}
+	}
+		
+}
+
+
+bool cSandSimulator::IsAllowedBlock( char a_BlockID )
+{
+	return a_BlockID == E_BLOCK_SAND
+		|| a_BlockID == 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)))		//This should save very much time because it doesn´t have to iterate through all blocks
+		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( char a_BlockID )
+{
+	return a_BlockID == E_BLOCK_AIR
+		|| IsBlockWater(a_BlockID)
+		|| IsBlockLava(a_BlockID)
+		|| a_BlockID == E_BLOCK_FIRE;
+
+}
+
+void cSandSimulator::WakeUp( int a_X, int a_Y, int a_Z )
+{
+	//Nothing else needs to be simulated :D (Bugs not included :s)
+	AddBlock( a_X, a_Y+1, a_Z );
+	AddBlock( a_X, a_Y, a_Z );
+}