path: root/src/Simulator/IncrementalRedstoneSimulator.cpp

#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules

#include "IncrementalRedstoneSimulator.h"
#include "../BlockEntities/DropSpenserEntity.h"
#include "../BlockEntities/NoteEntity.h"
#include "../BlockEntities/CommandBlockEntity.h"
#include "../Entities/TNTEntity.h"
#include "../Entities/Pickup.h"
#include "../Blocks/BlockTorch.h"
#include "../Blocks/BlockDoor.h"
#include "../Blocks/BlockButton.h"
#include "../Blocks/BlockLever.h"
#include "../Blocks/BlockPiston.h"



	

cIncrementalRedstoneSimulator::cIncrementalRedstoneSimulator(cWorld & a_World) :
	super(a_World),
	m_RedstoneSimulatorChunkData(),
	m_PoweredBlocks(),
	m_LinkedPoweredBlocks(),
	m_SimulatedPlayerToggleableBlocks(),
	m_RepeatersDelayList(),
	m_Chunk()
{
}





cIncrementalRedstoneSimulator::~cIncrementalRedstoneSimulator()
{
}





void cIncrementalRedstoneSimulator::RedstoneAddBlock(int a_BlockX, int a_BlockY, int a_BlockZ, cChunk * a_Chunk, cChunk * a_OtherChunk)
{
	if ((a_Chunk == NULL) || !a_Chunk->IsValid())
	{
		return;
	}
	else if ((a_BlockY < 0) || (a_BlockY > cChunkDef::Height))
	{
		return;
	}

	// We may be called with coordinates in a chunk that is not the first chunk parameter
	// In that case, the actual chunk (which the coordinates are in), will be passed as the second parameter
	// Use that Chunk pointer to get a relative position

	int RelX = 0;
	int RelZ = 0;	
	BLOCKTYPE Block;
	NIBBLETYPE Meta;
	cChunk * Chunk;

	if (a_OtherChunk != NULL)
	{
		RelX = a_BlockX - a_OtherChunk->GetPosX() * cChunkDef::Width;
		RelZ = a_BlockZ - a_OtherChunk->GetPosZ() * cChunkDef::Width;
		a_OtherChunk->GetBlockTypeMeta(RelX, a_BlockY, RelZ, Block, Meta);
		Chunk = a_OtherChunk;
	}
	else
	{
		RelX = a_BlockX - a_Chunk->GetPosX() * cChunkDef::Width;
		RelZ = a_BlockZ - a_Chunk->GetPosZ() * cChunkDef::Width;
		a_Chunk->GetBlockTypeMeta(RelX, a_BlockY, RelZ, Block, Meta);
		Chunk = a_Chunk;
	}

	// Every time a block is changed (AddBlock called), we want to go through all lists and check to see if the coordiantes stored within are still valid
	// Checking only when a block is changed, as opposed to every tick, also improves performance

	PoweredBlocksList * PoweredBlocks = a_Chunk->GetRedstoneSimulatorPoweredBlocksList();
	for (PoweredBlocksList::iterator itr = PoweredBlocks->begin(); itr != PoweredBlocks->end();)
	{
		if (!itr->a_SourcePos.Equals(Vector3i(a_BlockX, a_BlockY, a_BlockZ)))
		{
			++itr;
			continue;
		}

		if (!IsPotentialSource(Block))
		{
			LOGD("cIncrementalRedstoneSimulator: Erased block @ {%i, %i, %i} from powered blocks list as it no longer connected to a source", itr->a_BlockPos.x, itr->a_BlockPos.y, itr->a_BlockPos.z);
			itr = PoweredBlocks->erase(itr);
			Chunk->SetIsRedstoneDirty(true);
			continue;
		}
		else if (
			// Changeable sources
			((Block == E_BLOCK_REDSTONE_WIRE) && (Meta == 0)) ||
			((Block == E_BLOCK_LEVER) && !IsLeverOn(Meta)) ||
			((Block == E_BLOCK_DETECTOR_RAIL) && (Meta & 0x08) == 0) ||
			(((Block == E_BLOCK_STONE_BUTTON) || (Block == E_BLOCK_WOODEN_BUTTON)) && (!IsButtonOn(Meta))) ||
			(((Block == E_BLOCK_STONE_PRESSURE_PLATE) || (Block == E_BLOCK_WOODEN_PRESSURE_PLATE)) && (Meta == 0)) ||
			(((Block == E_BLOCK_LIGHT_WEIGHTED_PRESSURE_PLATE) || (Block == E_BLOCK_HEAVY_WEIGHTED_PRESSURE_PLATE)) && (Meta == 0))
			)
		{
			LOGD("cIncrementalRedstoneSimulator: Erased block @ {%i, %i, %i} from powered blocks list due to present/past metadata mismatch", itr->a_BlockPos.x, itr->a_BlockPos.y, itr->a_BlockPos.z);
			itr = PoweredBlocks->erase(itr);
			Chunk->SetIsRedstoneDirty(true);
			continue;
		}
		else if (Block == E_BLOCK_DAYLIGHT_SENSOR)
		{
			if (!m_World.IsChunkLighted(Chunk->GetPosX(), Chunk->GetPosZ()))
			{
				m_World.QueueLightChunk(Chunk->GetPosX(), Chunk->GetPosZ());
			}
			else
			{
				if (Chunk->GetTimeAlteredLight(Chunk->GetSkyLight(RelX, a_BlockY + 1, RelZ)) <= 7)
				{
					itr = PoweredBlocks->erase(itr);
					Chunk->SetIsRedstoneDirty(true);
					continue;
				}
			}
		}
		++itr;
	}

	LinkedBlocksList * LinkedPoweredBlocks = a_Chunk->GetRedstoneSimulatorLinkedBlocksList();
	// We loop through all values (insteading of breaking out at the first) to make sure everything is gone, as there can be multiple SourceBlock entries for one AddBlock coordinate
	for (LinkedBlocksList::iterator itr = LinkedPoweredBlocks->begin(); itr != LinkedPoweredBlocks->end();)
	{
		if (itr->a_SourcePos.Equals(Vector3i(a_BlockX, a_BlockY, a_BlockZ)))
		{
			if (!IsPotentialSource(Block))
			{
				LOGD("cIncrementalRedstoneSimulator: Erased block @ {%i, %i, %i} from linked powered blocks list as it is no longer connected to a source", itr->a_BlockPos.x, itr->a_BlockPos.y, itr->a_BlockPos.z);
				itr = LinkedPoweredBlocks->erase(itr);
				Chunk->SetIsRedstoneDirty(true);
				continue;
			}
			else if (
				// Things that can send power through a block but which depends on meta
				((Block == E_BLOCK_REDSTONE_WIRE) && (Meta == 0)) ||
				((Block == E_BLOCK_LEVER) && !IsLeverOn(Meta)) ||
				(((Block == E_BLOCK_STONE_BUTTON) || (Block == E_BLOCK_WOODEN_BUTTON)) && (!IsButtonOn(Meta))) ||
				(((Block == E_BLOCK_STONE_PRESSURE_PLATE) || (Block == E_BLOCK_WOODEN_PRESSURE_PLATE)) && (Meta == 0)) ||
				(((Block == E_BLOCK_LIGHT_WEIGHTED_PRESSURE_PLATE) || (Block == E_BLOCK_HEAVY_WEIGHTED_PRESSURE_PLATE)) && (Meta == 0))
				)
			{
				LOGD("cIncrementalRedstoneSimulator: Erased block @ {%i, %i, %i} from linked powered blocks list due to present/past metadata mismatch", itr->a_BlockPos.x, itr->a_BlockPos.y, itr->a_BlockPos.z);
				itr = LinkedPoweredBlocks->erase(itr);
				Chunk->SetIsRedstoneDirty(true);
				continue;
			}
		}
		else if (itr->a_MiddlePos.Equals(Vector3i(a_BlockX, a_BlockY, a_BlockZ)))
		{
			if (!IsViableMiddleBlock(Block))
			{
				LOGD("cIncrementalRedstoneSimulator: Erased block @ {%i, %i, %i} from linked powered blocks list as it is no longer powered through a valid middle block", itr->a_BlockPos.x, itr->a_BlockPos.y, itr->a_BlockPos.z);
				itr = LinkedPoweredBlocks->erase(itr);
				Chunk->SetIsRedstoneDirty(true);
				continue;
			}
		}
		++itr;
	}

	SimulatedPlayerToggleableList * SimulatedPlayerToggleableBlocks = a_Chunk->GetRedstoneSimulatorSimulatedPlayerToggleableList();
	for (SimulatedPlayerToggleableList::iterator itr = SimulatedPlayerToggleableBlocks->begin(); itr != SimulatedPlayerToggleableBlocks->end(); ++itr)
	{
		if (!itr->a_RelBlockPos.Equals(Vector3i(RelX, a_BlockY, RelZ)))
		{
			continue;
		}

		if (!IsAllowedBlock(Block))
		{
			LOGD("cIncrementalRedstoneSimulator: Erased block @ {%i, %i, %i} from toggleable simulated list as it is no longer redstone", itr->a_RelBlockPos.x, itr->a_RelBlockPos.y, itr->a_RelBlockPos.z);
			SimulatedPlayerToggleableBlocks->erase(itr);
			break;
		}
	}

	RepeatersDelayList * RepeatersDelayList = a_Chunk->GetRedstoneSimulatorRepeatersDelayList();
	for (RepeatersDelayList::iterator itr = RepeatersDelayList->begin(); itr != RepeatersDelayList->end(); ++itr)
	{
		if (!itr->a_RelBlockPos.Equals(Vector3i(RelX, a_BlockY, RelZ)))
		{
			continue;
		}

		if ((Block != E_BLOCK_REDSTONE_REPEATER_ON) && (Block != E_BLOCK_REDSTONE_REPEATER_OFF))
		{
			RepeatersDelayList->erase(itr);
			break;
		}
	}

	if (a_OtherChunk != NULL)
	{
		// DO NOT touch our chunk's data structure if we are being called with coordinates from another chunk - this one caused me massive grief :P
		return;
	}

	cRedstoneSimulatorChunkData * RedstoneSimulatorChunkData = a_Chunk->GetRedstoneSimulatorData();
	for (cRedstoneSimulatorChunkData::iterator itr = RedstoneSimulatorChunkData->begin(); itr != RedstoneSimulatorChunkData->end(); ++itr)
	{
		if ((itr->x == RelX) && (itr->y == a_BlockY) && (itr->z == RelZ)) // We are at an entry matching the current (changed) block
		{
			if (!IsAllowedBlock(Block))
			{
				itr->DataTwo = true; // The new blocktype is not redstone; it must be queued to be removed from this list
			}
			else
			{
				itr->DataTwo = false;
				itr->Data = Block; // Update block information
			}
			return;
		}
	}

	if (!IsAllowedBlock(Block))
	{
		return;
	}
	
	for (cRedstoneSimulatorChunkData::iterator itr = a_Chunk->GetRedstoneSimulatorQueuedData()->begin(); itr != a_Chunk->GetRedstoneSimulatorQueuedData()->end(); ++itr)
	{
		if ((itr->x == RelX) && (itr->y == a_BlockY) && (itr->z == RelZ))
		{
			// Can't have duplicates in here either, in case something adds the block again before the structure can written to the main chunk data
			return;
		}
	}
	a_Chunk->GetRedstoneSimulatorQueuedData()->push_back(cCoordWithBlockAndBool(RelX, a_BlockY, RelZ, Block, false));
}





void cIncrementalRedstoneSimulator::SimulateChunk(float a_Dt, int a_ChunkX, int a_ChunkZ, cChunk * a_Chunk)
{
	m_RedstoneSimulatorChunkData = a_Chunk->GetRedstoneSimulatorData();
	if (m_RedstoneSimulatorChunkData->empty() && a_Chunk->GetRedstoneSimulatorQueuedData()->empty())
	{
		return;
	}

	m_RedstoneSimulatorChunkData->insert(m_RedstoneSimulatorChunkData->end(), a_Chunk->GetRedstoneSimulatorQueuedData()->begin(), a_Chunk->GetRedstoneSimulatorQueuedData()->end());
	a_Chunk->GetRedstoneSimulatorQueuedData()->clear();

	m_PoweredBlocks = a_Chunk->GetRedstoneSimulatorPoweredBlocksList();
	m_RepeatersDelayList = a_Chunk->GetRedstoneSimulatorRepeatersDelayList();
	m_SimulatedPlayerToggleableBlocks = a_Chunk->GetRedstoneSimulatorSimulatedPlayerToggleableList();
	m_LinkedPoweredBlocks = a_Chunk->GetRedstoneSimulatorLinkedBlocksList();
	m_Chunk = a_Chunk;
	bool ShouldUpdateSimulateOnceBlocks = false;

	if (a_Chunk->IsRedstoneDirty())
	{
		// Simulate the majority of devices only if something (blockwise or power-wise) has changed
		// Make sure to allow the chunk to resimulate after the initial run if there was a power change (ShouldUpdateSimulateOnceBlocks helps to do this)
		a_Chunk->SetIsRedstoneDirty(false);
		ShouldUpdateSimulateOnceBlocks = true;
	}

	for (cRedstoneSimulatorChunkData::iterator dataitr = m_RedstoneSimulatorChunkData->begin(); dataitr != m_RedstoneSimulatorChunkData->end();)
	{
		if (dataitr->DataTwo)
		{
			dataitr = m_RedstoneSimulatorChunkData->erase(dataitr);
			continue;
		}

		switch (dataitr->Data)
		{
			case E_BLOCK_DAYLIGHT_SENSOR: HandleDaylightSensor(dataitr->x, dataitr->y, dataitr->z); break;

			case E_BLOCK_REDSTONE_REPEATER_OFF:
			case E_BLOCK_REDSTONE_REPEATER_ON:
			{
				bool FoundItem = false;
				for (RepeatersDelayList::iterator repeateritr = m_RepeatersDelayList->begin(); repeateritr != m_RepeatersDelayList->end(); ++repeateritr)
				{
					if (repeateritr->a_RelBlockPos == Vector3i(dataitr->x, dataitr->y, dataitr->z))
					{
						HandleRedstoneRepeater(dataitr->x, dataitr->y, dataitr->z, dataitr->Data, repeateritr);
						FoundItem = true;
						break;
					}
				}
				if (!FoundItem && ShouldUpdateSimulateOnceBlocks)
				{
					HandleRedstoneRepeater(dataitr->x, dataitr->y, dataitr->z, dataitr->Data, m_RepeatersDelayList->end());
				}
				break;
			}
			case E_BLOCK_WOODEN_PRESSURE_PLATE:
			case E_BLOCK_STONE_PRESSURE_PLATE:
			case E_BLOCK_LIGHT_WEIGHTED_PRESSURE_PLATE:
			case E_BLOCK_HEAVY_WEIGHTED_PRESSURE_PLATE:
			{
				HandlePressurePlate(dataitr->x, dataitr->y, dataitr->z, dataitr->Data);
				break;
			}
			default: break;
		}

		if (ShouldUpdateSimulateOnceBlocks)
		{
			switch (dataitr->Data)
			{				
				case E_BLOCK_REDSTONE_WIRE:         HandleRedstoneWire(dataitr->x, dataitr->y, dataitr->z);	  break;
				case E_BLOCK_COMMAND_BLOCK:         HandleCommandBlock(dataitr->x, dataitr->y, dataitr->z);   break;
				case E_BLOCK_NOTE_BLOCK:            HandleNoteBlock(dataitr->x, dataitr->y, dataitr->z);      break;
				case E_BLOCK_BLOCK_OF_REDSTONE:     HandleRedstoneBlock(dataitr->x, dataitr->y, dataitr->z);  break;
				case E_BLOCK_LEVER:                 HandleRedstoneLever(dataitr->x, dataitr->y, dataitr->z);  break;
				case E_BLOCK_FENCE_GATE:            HandleFenceGate(dataitr->x, dataitr->y, dataitr->z);      break;
				case E_BLOCK_TNT:                   HandleTNT(dataitr->x, dataitr->y, dataitr->z);            break;
				case E_BLOCK_TRAPDOOR:              HandleTrapdoor(dataitr->x, dataitr->y, dataitr->z);       break;

				case E_BLOCK_ACTIVATOR_RAIL:
				case E_BLOCK_DETECTOR_RAIL:
				case E_BLOCK_POWERED_RAIL:
				{
					HandleRail(dataitr->x, dataitr->y, dataitr->z, dataitr->Data);
					break;
				}
				case E_BLOCK_WOODEN_DOOR:
				case E_BLOCK_IRON_DOOR:
				{
					HandleDoor(dataitr->x, dataitr->y, dataitr->z);
					break;
				}
				case E_BLOCK_REDSTONE_LAMP_OFF:
				case E_BLOCK_REDSTONE_LAMP_ON:
				{
					HandleRedstoneLamp(dataitr->x, dataitr->y, dataitr->z, dataitr->Data);
					break;
				}
				case E_BLOCK_DISPENSER:
				case E_BLOCK_DROPPER:
				{
					HandleDropSpenser(dataitr->x, dataitr->y, dataitr->z);
					break;
				}
				case E_BLOCK_PISTON:
				case E_BLOCK_STICKY_PISTON:
				{
					HandlePiston(dataitr->x, dataitr->y, dataitr->z);
					break;
				}
				case E_BLOCK_REDSTONE_TORCH_OFF:
				case E_BLOCK_REDSTONE_TORCH_ON:
				{
					HandleRedstoneTorch(dataitr->x, dataitr->y, dataitr->z, dataitr->Data);
					break;
				}
				case E_BLOCK_STONE_BUTTON:
				case E_BLOCK_WOODEN_BUTTON:
				{
					HandleRedstoneButton(dataitr->x, dataitr->y, dataitr->z);
					break;
				}
				default: break;
			}
		}
		++dataitr;
	}
}




void cIncrementalRedstoneSimulator::WakeUp(int a_BlockX, int a_BlockY, int a_BlockZ, cChunk * a_Chunk)
{
	if (
		((a_BlockX % cChunkDef::Width) <= 1) ||
		((a_BlockX % cChunkDef::Width) >= 14) ||
		((a_BlockZ % cChunkDef::Width) <= 1) ||
		((a_BlockZ % cChunkDef::Width) >= 14)
		) // Are we on a chunk boundary? +- 2 because of LinkedPowered blocks
	{
		// On a chunk boundary, alert all four sides (i.e. at least one neighbouring chunk)
		AddBlock(a_BlockX, a_BlockY, a_BlockZ, a_Chunk);

		// Pass the original coordinates, because when adding things to our simulator lists, we get the chunk that they are in, and therefore any updates need to preseve their position
		// RedstoneAddBlock to pass both the neighbouring chunk and the chunk which the coordiantes are in and +- 2 in GetNeighbour() to accomodate for LinkedPowered blocks being 2 away from chunk boundaries
		RedstoneAddBlock(a_BlockX, a_BlockY, a_BlockZ, a_Chunk->GetNeighborChunk(a_BlockX - 2, a_BlockZ), a_Chunk);
		RedstoneAddBlock(a_BlockX, a_BlockY, a_BlockZ, a_Chunk->GetNeighborChunk(a_BlockX + 2, a_BlockZ), a_Chunk);
		RedstoneAddBlock(a_BlockX, a_BlockY, a_BlockZ, a_Chunk->GetNeighborChunk(a_BlockX, a_BlockZ - 2), a_Chunk);
		RedstoneAddBlock(a_BlockX, a_BlockY, a_BlockZ, a_Chunk->GetNeighborChunk(a_BlockX, a_BlockZ + 2), a_Chunk);

		return;
	}

	// Not on boundary, just alert this chunk for speed
	AddBlock(a_BlockX, a_BlockY, a_BlockZ, a_Chunk);
}





void cIncrementalRedstoneSimulator::HandleRedstoneTorch(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ, BLOCKTYPE a_MyState)
{
	static const struct // Define which directions the torch can power
	{
		int x, y, z;
	} gCrossCoords[] =
	{
		{ 1, 0,  0},
		{-1, 0,  0},
		{ 0, 0,  1},
		{ 0, 0, -1},
		{ 0, 1,  0},
	} ;

	if (a_MyState == E_BLOCK_REDSTONE_TORCH_ON)
	{
		// Check if the block the torch is on is powered		
		int X = a_RelBlockX; int Y = a_RelBlockY; int Z = a_RelBlockZ;
		AddFaceDirection(X, Y, Z, cBlockTorchHandler::MetaDataToDirection(m_Chunk->GetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ)), true); // Inverse true to get the block torch is on

		if (AreCoordsDirectlyPowered(X, Y, Z))
		{
			// There was a match, torch goes off
			m_Chunk->SetBlock(a_RelBlockX, a_RelBlockY, a_RelBlockZ, E_BLOCK_REDSTONE_TORCH_OFF, m_Chunk->GetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ));
			return;
		}

		// Torch still on, make all 4(X, Z) + 1(Y) sides powered
		for (size_t i = 0; i < ARRAYCOUNT(gCrossCoords); i++)
		{
			BLOCKTYPE Type = 0;
			if (!m_Chunk->UnboundedRelGetBlockType(a_RelBlockX + gCrossCoords[i].x, a_RelBlockY + gCrossCoords[i].y, a_RelBlockZ + gCrossCoords[i].z, Type))
			{
				continue;
			}
			if (i + 1 < ARRAYCOUNT(gCrossCoords)) // Sides of torch, not top (top is last)
			{
				if (
					((IsMechanism(Type)) || (Type == E_BLOCK_REDSTONE_WIRE)) && // Is it a mechanism or wire? Not block/other torch etc.
					(!Vector3i(a_RelBlockX + gCrossCoords[i].x, a_RelBlockY + gCrossCoords[i].y, a_RelBlockZ + gCrossCoords[i].z).Equals(Vector3i(X, Y, Z))) // CAN'T power block is that it is on
					)
				{
					SetBlockPowered(a_RelBlockX + gCrossCoords[i].x, a_RelBlockY + gCrossCoords[i].y, a_RelBlockZ + gCrossCoords[i].z, a_RelBlockX, a_RelBlockY, a_RelBlockZ);
				}
			}
			else
			{
				// Top side, power whatever is there, including blocks
				SetBlockPowered(a_RelBlockX + gCrossCoords[i].x, a_RelBlockY + gCrossCoords[i].y, a_RelBlockZ + gCrossCoords[i].z, a_RelBlockX, a_RelBlockY, a_RelBlockZ);
				// Power all blocks surrounding block above torch
				SetDirectionLinkedPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, BLOCK_FACE_YP);
			}
		}

		if (m_Chunk->GetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ) != 0x5) // Is torch standing on ground? If NOT (i.e. on wall), power block beneath
		{
			BLOCKTYPE Type = m_Chunk->GetBlock(a_RelBlockX, a_RelBlockY - 1, a_RelBlockZ);

			if ((IsMechanism(Type)) || (Type == E_BLOCK_REDSTONE_WIRE)) // Still can't make a normal block powered though!
			{
				SetBlockPowered(a_RelBlockX, a_RelBlockY - 1, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ);
			}
		}
	}
	else
	{
		// Check if the block the torch is on is powered		
		int X = a_RelBlockX; int Y = a_RelBlockY; int Z = a_RelBlockZ;
		AddFaceDirection(X, Y, Z, cBlockTorchHandler::MetaDataToDirection(m_Chunk->GetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ)), true); // Inverse true to get the block torch is on

		// See if off state torch can be turned on again
		if (AreCoordsDirectlyPowered(X, Y, Z))
		{
			return; // Something matches, torch still powered
		}

		// Block torch on not powered, can be turned on again!
		m_Chunk->SetBlock(a_RelBlockX, a_RelBlockY, a_RelBlockZ, E_BLOCK_REDSTONE_TORCH_ON, m_Chunk->GetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ));
	}
}





void cIncrementalRedstoneSimulator::HandleRedstoneBlock(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ)
{
	SetAllDirsAsPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ);
	SetBlockPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ); // Set self as powered
}





void cIncrementalRedstoneSimulator::HandleRedstoneLever(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ)
{
	NIBBLETYPE Meta = m_Chunk->GetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ);
	if (IsLeverOn(Meta))
	{
		SetAllDirsAsPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ);

		NIBBLETYPE Dir = cBlockLeverHandler::BlockMetaDataToBlockFace(Meta);
		switch (Dir) // Now, flip the direction into the type used by SetBlockLinkedPowered()
		{
			case BLOCK_FACE_YP:
			case BLOCK_FACE_XP:
			case BLOCK_FACE_ZP:
			{
				Dir--;
				break;
			}
			case BLOCK_FACE_XM:
			case BLOCK_FACE_ZM:
			case BLOCK_FACE_YM:
			{
				Dir++;
				break;
			}
			default:
			{
				ASSERT(!"Unhandled lever metadata!");
				return;
			}
		}
		SetDirectionLinkedPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, Dir);
	}
}





void cIncrementalRedstoneSimulator::HandleFenceGate(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ)
{
	int BlockX = (m_Chunk->GetPosX() * cChunkDef::Width) + a_RelBlockX;
	int BlockZ = (m_Chunk->GetPosZ() * cChunkDef::Width) + a_RelBlockZ;
	NIBBLETYPE MetaData = m_Chunk->GetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ);

	if (AreCoordsPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ))
	{
		if (!AreCoordsSimulated(a_RelBlockX, a_RelBlockY, a_RelBlockZ, true))
		{
			if ((MetaData & 0x4) == 0)
			{
				m_Chunk->SetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ, MetaData | 0x4);
				m_Chunk->BroadcastSoundParticleEffect(1003, BlockX, a_RelBlockY, BlockZ, 0);
			}
			SetPlayerToggleableBlockAsSimulated(a_RelBlockX, a_RelBlockY, a_RelBlockZ, true);
		}
	}
	else
	{
		if (!AreCoordsSimulated(a_RelBlockX, a_RelBlockY, a_RelBlockZ, false))
		{
			if ((MetaData & 0x4) != 0)
			{
				m_Chunk->SetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ, MetaData & ~0x04);
				m_Chunk->BroadcastSoundParticleEffect(1003, BlockX, a_RelBlockY, BlockZ, 0);
			}
			SetPlayerToggleableBlockAsSimulated(a_RelBlockX, a_RelBlockY, a_RelBlockZ, false);
		}
	}
}





void cIncrementalRedstoneSimulator::HandleRedstoneButton(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ)
{
	NIBBLETYPE Meta = m_Chunk->GetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ);
	if (IsButtonOn(Meta))
	{
		SetAllDirsAsPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ);
		
		NIBBLETYPE Dir = cBlockButtonHandler::BlockMetaDataToBlockFace(Meta);
		switch (Dir) // Now, flip the direction into the type used by SetBlockLinkedPowered()
		{
			case BLOCK_FACE_XP:
			case BLOCK_FACE_ZP:
			{
				Dir--;
				break;
			}
			case BLOCK_FACE_XM:
			case BLOCK_FACE_ZM:
			{
				Dir++;
				break;
			}
			default:
			{
				ASSERT(!"Unhandled button metadata!");
				return;
			}
		}
		SetDirectionLinkedPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, Dir);
	}
}





void cIncrementalRedstoneSimulator::HandleRedstoneWire(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ)
{
	static const struct // Define which directions the wire can receive power from
	{
		int x, y, z;
	} gCrossCoords[] =
	{
		{ 1, 0,  0}, /* Wires on same level start */
		{-1, 0,  0},
		{ 0, 0,  1},
		{ 0, 0, -1}, /* Wires on same level stop */
		{ 1, 1,  0}, /* Wires one higher, surrounding self start */
		{-1, 1,  0},
		{ 0, 1,  1},
		{ 0, 1, -1}, /* Wires one higher, surrounding self stop */
		{ 1,-1,  0}, /* Wires one lower, surrounding self start */
		{-1,-1,  0},
		{ 0,-1,  1},
		{ 0,-1, -1}, /* Wires one lower, surrounding self stop */
	} ;

	static const struct // Define which directions the wire will check for repeater prescence
	{
		int x, y, z;
	} gSideCoords[] =
	{
		{ 1, 0, 0 },
		{-1, 0, 0 },
		{ 0, 0, 1 },
		{ 0, 0,-1 },
		{ 0, 1, 0 },
	};

	// Check to see if directly beside a power source
	unsigned char MyPower;
	if (!IsWirePowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, MyPower))
	{
		int BlockX = (m_Chunk->GetPosX() * cChunkDef::Width) + a_RelBlockX;
		int BlockZ = (m_Chunk->GetPosZ() * cChunkDef::Width) + a_RelBlockZ;
		m_Chunk->SetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ, 0);
		m_World.WakeUpSimulators(BlockX, a_RelBlockY, BlockZ);
		return;
	}
	
	m_Chunk->SetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ, MyPower);

	if (MyPower < 1)
	{
		return;
	}

	MyPower--;

	for (size_t i = 0; i < ARRAYCOUNT(gCrossCoords); i++) // Loop through all directions to transfer or receive power
	{
		if ((i >= 4) && (i <= 7)) // If we are currently checking for wire surrounding ourself one block above...
		{
			BLOCKTYPE Type = 0;
			if (a_RelBlockY + 1 >= cChunkDef::Height)
			{
				continue;
			}
			if (!m_Chunk->UnboundedRelGetBlockType(a_RelBlockX, a_RelBlockY + 1, a_RelBlockZ, Type))
			{
				continue;
			}
			if (cBlockInfo::IsSolid(Type)) // 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
		{
			BLOCKTYPE Type = 0;
			if (!m_Chunk->UnboundedRelGetBlockType(a_RelBlockX + gCrossCoords[i].x, a_RelBlockY, a_RelBlockZ + gCrossCoords[i].z, Type))
			{
				continue;
			}
			if (cBlockInfo::IsSolid(Type))
			{
				continue;
			}
		}

		BLOCKTYPE Type = 0;
		if (!m_Chunk->UnboundedRelGetBlockType(a_RelBlockX + gCrossCoords[i].x, a_RelBlockY + gCrossCoords[i].y, a_RelBlockZ + gCrossCoords[i].z, Type))
		{
			continue;
		}
		if (Type == E_BLOCK_REDSTONE_WIRE)
		{
			SetBlockPowered(a_RelBlockX + gCrossCoords[i].x, a_RelBlockY + gCrossCoords[i].y, a_RelBlockZ + gCrossCoords[i].z, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MyPower);
		}
	}

	for (size_t i = 0; i < ARRAYCOUNT(gSideCoords); i++) // Look for repeaters immediately surrounding self and try to power them
	{
		BLOCKTYPE Type = 0;
		if (!m_Chunk->UnboundedRelGetBlockType(a_RelBlockX + gSideCoords[i].x, a_RelBlockY + gSideCoords[i].y, a_RelBlockZ + gSideCoords[i].z, Type))
		{
			continue;
		}
		if (Type == E_BLOCK_REDSTONE_REPEATER_OFF)
		{
			SetBlockPowered(a_RelBlockX + gSideCoords[i].x, a_RelBlockY + gSideCoords[i].y, a_RelBlockZ + gSideCoords[i].z, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MyPower);
		}
	}

	// Wire still powered, power blocks beneath
	SetBlockPowered(a_RelBlockX, a_RelBlockY - 1, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MyPower);
	SetDirectionLinkedPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, BLOCK_FACE_YM, MyPower);

	switch (GetWireDirection(a_RelBlockX, a_RelBlockY, a_RelBlockZ))
	{
		case REDSTONE_NONE:
		{
			SetBlockPowered(a_RelBlockX + 1, a_RelBlockY, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MyPower);
			SetBlockPowered(a_RelBlockX - 1, a_RelBlockY, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MyPower);
			SetBlockPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ + 1, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MyPower);
			SetBlockPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ - 1, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MyPower);

			SetDirectionLinkedPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, BLOCK_FACE_XM, MyPower);
			SetDirectionLinkedPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, BLOCK_FACE_XP, MyPower);
			SetDirectionLinkedPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, BLOCK_FACE_ZM, MyPower);
			SetDirectionLinkedPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, BLOCK_FACE_ZP, MyPower);
			break;
		}
		case REDSTONE_X_POS:
		{
			SetBlockPowered(a_RelBlockX + 1, a_RelBlockY, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MyPower);
			SetDirectionLinkedPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, BLOCK_FACE_XP, MyPower);
			break;
		}
		case REDSTONE_X_NEG:
		{
			SetBlockPowered(a_RelBlockX - 1, a_RelBlockY, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MyPower);
			SetDirectionLinkedPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, BLOCK_FACE_XM, MyPower);
			break;
		}
		case REDSTONE_Z_POS:
		{
			SetBlockPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ + 1, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MyPower);
			SetDirectionLinkedPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, BLOCK_FACE_ZP, MyPower);
			break;
		}
		case REDSTONE_Z_NEG:
		{
			SetBlockPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ - 1, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MyPower);
			SetDirectionLinkedPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, BLOCK_FACE_ZM, MyPower);
			break;
		}
	}
}





void cIncrementalRedstoneSimulator::HandleRedstoneRepeater(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ, BLOCKTYPE a_MyState, RepeatersDelayList::iterator a_Itr)
{
	/* Repeater Orientation Mini Guide:
	===================================

	|
	| Z Axis
	V

	X Axis ---->

	Repeater directions, values from a cWorld::GetBlockMeta(a_RelBlockX , a_RelBlockY, a_RelBlockZ) lookup:

	East (Right) (X+): 0x1
	West (Left) (X-): 0x3
	North (Up) (Z-): 0x2
	South (Down) (Z+): 0x0
	// TODO: Add E_META_XXX enum entries for all meta values and update project with them

	Sun rises from East (X+)

	*/

	// Create a variable holding my meta to avoid multiple lookups.
	NIBBLETYPE a_Meta = m_Chunk->GetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ);
	bool IsOn = (a_MyState == E_BLOCK_REDSTONE_REPEATER_ON);
    
	bool WereItrsChanged = false;
	if (!IsRepeaterLocked(a_RelBlockX, a_RelBlockY, a_RelBlockZ, a_Meta)) // If we're locked, change nothing. Otherwise:
	{
		bool IsSelfPowered = IsRepeaterPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, a_Meta);
		if (IsSelfPowered && !IsOn) // Queue a power change if powered, but not on and not locked.
		{
			WereItrsChanged = QueueRepeaterPowerChange(a_RelBlockX, a_RelBlockY, a_RelBlockZ, a_Meta, true);
		}
		else if (!IsSelfPowered && IsOn) // Queue a power change if unpowered, on, and not locked.
		{
			WereItrsChanged = QueueRepeaterPowerChange(a_RelBlockX, a_RelBlockY, a_RelBlockZ, a_Meta, false);
		}
		else if (a_Itr == m_RepeatersDelayList->end())
		{
			return;
		}
	}
	else if (a_Itr == m_RepeatersDelayList->end())
	{
		return;
	}

	if (WereItrsChanged)
	{
		for (a_Itr = m_RepeatersDelayList->begin(); a_Itr != m_RepeatersDelayList->end(); ++a_Itr)
		{
			if (a_Itr->a_RelBlockPos == Vector3i(a_RelBlockX, a_RelBlockY, a_RelBlockZ))
			{
				// Leave a_Itr at where we found the entry
				break;
			}
		}
	}

	// a_Itr may be passed with m_RepeatersDelayList::end, however, we can guarantee this iterator is always valid because...
	// ...QueueRepeaterPowerChange is called to add an entry (and the above code updates iterator). However, if the repeater was locked or something similar...
	// ...we will never get here because of the returns.
	if (a_Itr->a_ElapsedTicks >= a_Itr->a_DelayTicks) // Has the elapsed ticks reached the target ticks?
	{
		if (a_Itr->ShouldPowerOn)
		{
			if (!IsOn)
			{
				m_Chunk->SetBlock(a_RelBlockX, a_RelBlockY, a_RelBlockZ, E_BLOCK_REDSTONE_REPEATER_ON, a_Meta); // For performance
			}

			switch (a_Meta & 0x3) // We only want the direction (bottom) bits
			{
				case 0x0:
				{
					SetBlockPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ - 1, a_RelBlockX, a_RelBlockY, a_RelBlockZ);
					SetDirectionLinkedPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, BLOCK_FACE_ZM);
					break;
				}
				case 0x1:
				{
					SetBlockPowered(a_RelBlockX + 1, a_RelBlockY, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ);
					SetDirectionLinkedPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, BLOCK_FACE_XP);
					break;
				}
				case 0x2:
				{
					SetBlockPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ + 1, a_RelBlockX, a_RelBlockY, a_RelBlockZ);
					SetDirectionLinkedPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, BLOCK_FACE_ZP);
					break;
				}
				case 0x3:
				{
					SetBlockPowered(a_RelBlockX - 1, a_RelBlockY, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ);
					SetDirectionLinkedPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, BLOCK_FACE_XM);
					break;
				}
			}

			// Removal of the data entry will be handled in SimChunk - we still want to continue trying to power blocks, even if our delay time has reached
			// Otherwise, the power state of blocks in front won't update after we have powered on
			return;
		}
		else
		{
			if (IsOn)
			{
				m_Chunk->SetBlock(a_RelBlockX, a_RelBlockY, a_RelBlockZ, E_BLOCK_REDSTONE_REPEATER_OFF, a_Meta);
			}
			m_RepeatersDelayList->erase(a_Itr); // We can remove off repeaters which don't need further updating
			return;
		}
	}
	else
	{
		// Apparently, incrementing ticks only works reliably here, and not in SimChunk;
		// With a world with lots of redstone, the repeaters simply do not delay
		// I am confounded to say why. Perhaps optimisation failure.
		LOGD("Incremented a repeater @ {%i %i %i} | Elapsed ticks: %i | Target delay: %i", a_Itr->a_RelBlockPos.x, a_Itr->a_RelBlockPos.y, a_Itr->a_RelBlockPos.z, a_Itr->a_ElapsedTicks, a_Itr->a_DelayTicks);
		a_Itr->a_ElapsedTicks++;
	}
}





void cIncrementalRedstoneSimulator::HandlePiston(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ)
{	
	int BlockX = (m_Chunk->GetPosX() * cChunkDef::Width) + a_RelBlockX;
	int BlockZ = (m_Chunk->GetPosZ() * cChunkDef::Width) + a_RelBlockZ;

	if (IsPistonPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, m_Chunk->GetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ) & 0x7)) // We only want the bottom three bits (4th controls extended-ness)
	{
		cBlockPistonHandler::ExtendPiston(BlockX, a_RelBlockY, BlockZ, &m_World);
	}
	else
	{
		cBlockPistonHandler::RetractPiston(BlockX, a_RelBlockY, BlockZ, &m_World);
	}
}





void cIncrementalRedstoneSimulator::HandleDropSpenser(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ)
{
	class cSetPowerToDropSpenser :
		public cDropSpenserCallback
	{
		bool m_IsPowered;
	public:
		cSetPowerToDropSpenser(bool a_IsPowered) : m_IsPowered(a_IsPowered) {}
				
		virtual bool Item(cDropSpenserEntity * a_DropSpenser) override
		{
			a_DropSpenser->SetRedstonePower(m_IsPowered);
			return false;
		}
	} DrSpSP (AreCoordsPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ));

	int BlockX = (m_Chunk->GetPosX() * cChunkDef::Width) + a_RelBlockX;
	int BlockZ = (m_Chunk->GetPosZ() * cChunkDef::Width) + a_RelBlockZ;
	m_Chunk->DoWithDropSpenserAt(BlockX, a_RelBlockY, BlockZ, DrSpSP);
}





void cIncrementalRedstoneSimulator::HandleRedstoneLamp(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ, BLOCKTYPE a_MyState)
{
	if (a_MyState == E_BLOCK_REDSTONE_LAMP_OFF)
	{
		if (AreCoordsPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ))
		{
			m_Chunk->SetBlock(a_RelBlockX, a_RelBlockY, a_RelBlockZ, E_BLOCK_REDSTONE_LAMP_ON, 0);
		}
	}
	else
	{
		if (!AreCoordsPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ))
		{
			m_Chunk->SetBlock(a_RelBlockX, a_RelBlockY, a_RelBlockZ, E_BLOCK_REDSTONE_LAMP_OFF, 0);
		}
	}
}





void cIncrementalRedstoneSimulator::HandleTNT(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ)
{
	int BlockX = (m_Chunk->GetPosX() * cChunkDef::Width) + a_RelBlockX;
	int BlockZ = (m_Chunk->GetPosZ() * cChunkDef::Width) + a_RelBlockZ;

	if (AreCoordsPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ))
	{
		m_Chunk->BroadcastSoundEffect("game.tnt.primed", BlockX * 8, a_RelBlockY * 8, BlockZ * 8, 0.5f, 0.6f);
		m_Chunk->SetBlock(a_RelBlockX, a_RelBlockY, a_RelBlockZ, E_BLOCK_AIR, 0);
		m_World.SpawnPrimedTNT(BlockX + 0.5, a_RelBlockY + 0.5, BlockZ + 0.5);  // 80 ticks to boom
	}
}





void cIncrementalRedstoneSimulator::HandleDoor(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ)
{
	int BlockX = (m_Chunk->GetPosX() * cChunkDef::Width) + a_RelBlockX;
	int BlockZ = (m_Chunk->GetPosZ() * cChunkDef::Width) + a_RelBlockZ;

	if (AreCoordsPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ))
	{
		if (!AreCoordsSimulated(a_RelBlockX, a_RelBlockY, a_RelBlockZ, true))
		{
			cChunkInterface ChunkInterface(m_World.GetChunkMap());
			if (!cBlockDoorHandler::IsOpen(ChunkInterface, BlockX, a_RelBlockY, BlockZ))
			{
				cBlockDoorHandler::SetOpen(ChunkInterface, BlockX, a_RelBlockY, BlockZ, true);
				m_Chunk->BroadcastSoundParticleEffect(1003, BlockX, a_RelBlockY, BlockZ, 0);
			}
			SetPlayerToggleableBlockAsSimulated(a_RelBlockX, a_RelBlockY, a_RelBlockZ, true);
		}
	}
	else
	{
		if (!AreCoordsSimulated(a_RelBlockX, a_RelBlockY, a_RelBlockZ, false))
		{
			cChunkInterface ChunkInterface(m_World.GetChunkMap());
			if (cBlockDoorHandler::IsOpen(ChunkInterface, BlockX, a_RelBlockY, BlockZ))
			{
				cBlockDoorHandler::SetOpen(ChunkInterface, BlockX, a_RelBlockY, BlockZ, false);
				m_Chunk->BroadcastSoundParticleEffect(1003, BlockX, a_RelBlockY, BlockZ, 0);
			}
			SetPlayerToggleableBlockAsSimulated(a_RelBlockX, a_RelBlockY, a_RelBlockZ, false);
		}
	}
}





void cIncrementalRedstoneSimulator::HandleCommandBlock(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ)
{
	class cSetPowerToCommandBlock :
		public cCommandBlockCallback
	{
		bool m_IsPowered;
	public:
		cSetPowerToCommandBlock(bool a_IsPowered) : m_IsPowered(a_IsPowered) {}
				
		virtual bool Item(cCommandBlockEntity * a_CommandBlock) override
		{
			a_CommandBlock->SetRedstonePower(m_IsPowered);
			return false;
		}
	} CmdBlockSP (AreCoordsPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ));

	int BlockX = (m_Chunk->GetPosX() * cChunkDef::Width) + a_RelBlockX;
	int BlockZ = (m_Chunk->GetPosZ() * cChunkDef::Width) + a_RelBlockZ;
	m_Chunk->DoWithCommandBlockAt(BlockX, a_RelBlockY, BlockZ, CmdBlockSP);
}





void cIncrementalRedstoneSimulator::HandleRail(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ, BLOCKTYPE a_MyType)
{
	switch (a_MyType)
	{
		case E_BLOCK_DETECTOR_RAIL:
		{
			if ((m_Chunk->GetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ) & 0x08) == 0x08)
			{
				SetAllDirsAsPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, a_MyType);
			}
			break;
		}
		case E_BLOCK_ACTIVATOR_RAIL:
		case E_BLOCK_POWERED_RAIL:
		{
			if (AreCoordsPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ))
			{
				m_Chunk->SetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ, m_Chunk->GetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ) | 0x08);
			}
			else
			{
				m_Chunk->SetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ, m_Chunk->GetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ) & 0x07);
			}
			break;
		}
		default: LOGD("Unhandled type of rail in %s", __FUNCTION__);
	}
}





void cIncrementalRedstoneSimulator::HandleTrapdoor(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ)
{
	int BlockX = (m_Chunk->GetPosX() * cChunkDef::Width) + a_RelBlockX;
	int BlockZ = (m_Chunk->GetPosZ() * cChunkDef::Width) + a_RelBlockZ;

	if (AreCoordsPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ))
	{
		if (!AreCoordsSimulated(a_RelBlockX, a_RelBlockY, a_RelBlockZ, true))
		{
			m_World.SetTrapdoorOpen(BlockX, a_RelBlockY, BlockZ, true);
			SetPlayerToggleableBlockAsSimulated(a_RelBlockX, a_RelBlockY, a_RelBlockZ, true);
		}
	}
	else
	{
		if (!AreCoordsSimulated(a_RelBlockX, a_RelBlockY, a_RelBlockZ, false))
		{
			m_World.SetTrapdoorOpen(BlockX, a_RelBlockY, BlockZ, false);
			SetPlayerToggleableBlockAsSimulated(a_RelBlockX, a_RelBlockY, a_RelBlockZ, false);
		}
	}
}





void cIncrementalRedstoneSimulator::HandleNoteBlock(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ)
{
	bool m_bAreCoordsPowered = AreCoordsPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ);

	if (m_bAreCoordsPowered)
	{
		if (!AreCoordsSimulated(a_RelBlockX, a_RelBlockY, a_RelBlockZ, true))
		{
			class cSetPowerToNoteBlock :
				public cNoteBlockCallback
			{
				bool m_IsPowered;
			public:
				cSetPowerToNoteBlock(bool a_IsPowered) : m_IsPowered(a_IsPowered) {}

				virtual bool Item(cNoteEntity * a_NoteBlock) override
				{
					if (m_IsPowered)
					{
						a_NoteBlock->MakeSound();
					}
					return false;
				}
			} NoteBlockSP(m_bAreCoordsPowered);

			int BlockX = (m_Chunk->GetPosX() * cChunkDef::Width) + a_RelBlockX;
			int BlockZ = (m_Chunk->GetPosZ() * cChunkDef::Width) + a_RelBlockZ;
			m_Chunk->DoWithNoteBlockAt(BlockX, a_RelBlockY, BlockZ, NoteBlockSP);
			SetPlayerToggleableBlockAsSimulated(a_RelBlockX, a_RelBlockY, a_RelBlockZ, true);
		}
	}
	else
	{
		if (!AreCoordsSimulated(a_RelBlockX, a_RelBlockY, a_RelBlockZ, false))
		{
			SetPlayerToggleableBlockAsSimulated(a_RelBlockX, a_RelBlockY, a_RelBlockZ, false);
		}
	}
}





void cIncrementalRedstoneSimulator::HandleDaylightSensor(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ)
{
	int a_ChunkX, a_ChunkZ;
	cChunkDef::BlockToChunk(a_RelBlockX, a_RelBlockZ, a_ChunkX, a_ChunkZ);

	if (!m_World.IsChunkLighted(a_ChunkX, a_ChunkZ))
	{
		m_World.QueueLightChunk(a_ChunkX, a_ChunkZ);
	}
	else
	{
		int BlockX = (m_Chunk->GetPosX() * cChunkDef::Width) + a_RelBlockX;
		int BlockZ = (m_Chunk->GetPosZ() * cChunkDef::Width) + a_RelBlockZ;
		NIBBLETYPE SkyLight = m_Chunk->GetTimeAlteredLight(m_World.GetBlockSkyLight(BlockX, a_RelBlockY + 1, BlockZ));
		if (SkyLight > 8)
		{
			SetAllDirsAsPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ);
		}
		else
		{
			WakeUp(BlockX, a_RelBlockY, BlockZ, m_Chunk);
		}
	}
}





void cIncrementalRedstoneSimulator::HandlePressurePlate(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ, BLOCKTYPE a_MyType)
{
	int BlockX = (m_Chunk->GetPosX() * cChunkDef::Width) + a_RelBlockX;
	int BlockZ = (m_Chunk->GetPosZ() * cChunkDef::Width) + a_RelBlockZ;

	switch (a_MyType)
	{
		case E_BLOCK_STONE_PRESSURE_PLATE:
		{
			// MCS feature - stone pressure plates can only be triggered by players :D
			cPlayer * a_Player = m_World.FindClosestPlayer(Vector3f(BlockX + 0.5f, (float)a_RelBlockY, BlockZ + 0.5f), 0.7f, false);

			if (a_Player != NULL)
			{
				m_Chunk->SetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ, 0x1);
				SetAllDirsAsPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ);
				SetDirectionLinkedPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, BLOCK_FACE_YM, a_MyType);
			}
			else
			{
				m_Chunk->SetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ, 0x0);
				m_World.WakeUpSimulators(BlockX, a_RelBlockY, BlockZ);
			}
			break;
		}
		case E_BLOCK_LIGHT_WEIGHTED_PRESSURE_PLATE:
		{
			class cPressurePlateCallback :
				public cEntityCallback
			{
			public:
				cPressurePlateCallback(int a_BlockX, int a_BlockY, int a_BlockZ) :
					m_NumberOfEntities(0),
					m_X(a_BlockX),
					m_Y(a_BlockY),
					m_Z(a_BlockZ)
				{
				}

				virtual bool Item(cEntity * a_Entity) override
				{
					Vector3f EntityPos = a_Entity->GetPosition();
					Vector3f BlockPos(m_X + 0.5f, (float)m_Y, m_Z + 0.5f);
					double Distance = (EntityPos - BlockPos).Length();

					if (Distance <= 0.7)
					{
						m_NumberOfEntities++;
					}
					return false;
				}

				bool GetPowerLevel(unsigned char & a_PowerLevel) const
				{
					a_PowerLevel = std::min(m_NumberOfEntities, MAX_POWER_LEVEL);
					return (a_PowerLevel > 0);
				}

			protected:
				int m_NumberOfEntities;

				int m_X;
				int m_Y;
				int m_Z;
			};

			cPressurePlateCallback PressurePlateCallback(BlockX, a_RelBlockY, BlockZ);
			m_World.ForEachEntity(PressurePlateCallback);

			unsigned char Power;
			NIBBLETYPE Meta = m_Chunk->GetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ);
			if (PressurePlateCallback.GetPowerLevel(Power))
			{
				if (Meta == E_META_PRESSURE_PLATE_RAISED)
				{
					m_Chunk->BroadcastSoundEffect("random.click", (int)((BlockX + 0.5) * 8.0), (int)((a_RelBlockY + 0.1) * 8.0), (int)((BlockZ + 0.5) * 8.0), 0.3F, 0.5F);
				}
				m_Chunk->SetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ, E_META_PRESSURE_PLATE_DEPRESSED);
				SetAllDirsAsPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, Power);
				SetDirectionLinkedPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, BLOCK_FACE_YM, a_MyType);
			}
			else
			{
				if (Meta == E_META_PRESSURE_PLATE_DEPRESSED)
				{
					m_Chunk->BroadcastSoundEffect("random.click", (int)((BlockX + 0.5) * 8.0), (int)((a_RelBlockY + 0.1) * 8.0), (int)((BlockZ + 0.5) * 8.0), 0.3F, 0.6F);
				}
				m_Chunk->SetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ, E_META_PRESSURE_PLATE_RAISED);
				m_World.WakeUpSimulators(BlockX, a_RelBlockY, BlockZ);
			}

			break;
		}
		case E_BLOCK_HEAVY_WEIGHTED_PRESSURE_PLATE:
		{
			class cPressurePlateCallback :
				public cEntityCallback
			{
			public:
				cPressurePlateCallback(int a_BlockX, int a_BlockY, int a_BlockZ) :
					m_NumberOfEntities(0),
					m_X(a_BlockX),
					m_Y(a_BlockY),
					m_Z(a_BlockZ)
				{
				}

				virtual bool Item(cEntity * a_Entity) override
				{
					Vector3f EntityPos = a_Entity->GetPosition();
					Vector3f BlockPos(m_X + 0.5f, (float)m_Y, m_Z + 0.5f);
					double Distance = (EntityPos - BlockPos).Length();

					if (Distance <= 0.7)
					{
						m_NumberOfEntities++;
					}
					return false;
				}

				bool GetPowerLevel(unsigned char & a_PowerLevel) const
				{
					a_PowerLevel = std::min((int)ceil(m_NumberOfEntities / (float)10), MAX_POWER_LEVEL);
					return (a_PowerLevel > 0);
				}

			protected:
				int m_NumberOfEntities;

				int m_X;
				int m_Y;
				int m_Z;
			};

			cPressurePlateCallback PressurePlateCallback(BlockX, a_RelBlockY, BlockZ);
			m_World.ForEachEntity(PressurePlateCallback);

			unsigned char Power;
			NIBBLETYPE Meta = m_Chunk->GetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ);
			if (PressurePlateCallback.GetPowerLevel(Power))
			{
				if (Meta == E_META_PRESSURE_PLATE_RAISED)
				{
					m_Chunk->BroadcastSoundEffect("random.click", (int)((BlockX + 0.5) * 8.0), (int)((a_RelBlockY + 0.1) * 8.0), (int)((BlockZ + 0.5) * 8.0), 0.3F, 0.5F);
				}
				m_Chunk->SetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ, E_META_PRESSURE_PLATE_DEPRESSED);
				SetAllDirsAsPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, Power);
				SetDirectionLinkedPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, BLOCK_FACE_YM, a_MyType);
			}
			else
			{
				if (Meta == E_META_PRESSURE_PLATE_DEPRESSED)
				{
					m_Chunk->BroadcastSoundEffect("random.click", (int)((BlockX + 0.5) * 8.0), (int)((a_RelBlockY + 0.1) * 8.0), (int)((BlockZ + 0.5) * 8.0), 0.3F, 0.6F);
				}
				m_Chunk->SetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ, E_META_PRESSURE_PLATE_RAISED);
				m_World.WakeUpSimulators(BlockX, a_RelBlockY, BlockZ);
			}

			break;
		}
		case E_BLOCK_WOODEN_PRESSURE_PLATE:
		{
			class cPressurePlateCallback :
				public cEntityCallback
			{
			public:
				cPressurePlateCallback(int a_BlockX, int a_BlockY, int a_BlockZ) :
					m_FoundEntity(false),
					m_X(a_BlockX),
					m_Y(a_BlockY),
					m_Z(a_BlockZ)
				{
				}

				virtual bool Item(cEntity * a_Entity) override
				{
					Vector3f EntityPos = a_Entity->GetPosition();
					Vector3f BlockPos(m_X + 0.5f, (float)m_Y, m_Z + 0.5f);
					double Distance = (EntityPos - BlockPos).Length();

					if (Distance <= 0.7)
					{
						m_FoundEntity = true;
						return true; // Break out, we only need to know for plates that at least one entity is on top
					}
					return false;
				}

				bool FoundEntity(void) const
				{
					return m_FoundEntity;
				}

			protected:
				bool m_FoundEntity;

				int m_X;
				int m_Y;
				int m_Z;
			} ;

			cPressurePlateCallback PressurePlateCallback(BlockX, a_RelBlockY, BlockZ);
			m_World.ForEachEntity(PressurePlateCallback);

			NIBBLETYPE Meta = m_Chunk->GetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ);
			if (PressurePlateCallback.FoundEntity())
			{
				if (Meta == E_META_PRESSURE_PLATE_RAISED)
				{
					m_Chunk->BroadcastSoundEffect("random.click", (int)((BlockX + 0.5) * 8.0), (int)((a_RelBlockY + 0.1) * 8.0), (int)((BlockZ + 0.5) * 8.0), 0.3F, 0.5F);
				}
				m_Chunk->SetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ, E_META_PRESSURE_PLATE_DEPRESSED);
				SetAllDirsAsPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ);
				SetDirectionLinkedPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ, BLOCK_FACE_YM, a_MyType);
			}
			else
			{
				if (Meta == E_META_PRESSURE_PLATE_DEPRESSED)
				{
					m_Chunk->BroadcastSoundEffect("random.click", (int)((BlockX + 0.5) * 8.0), (int)((a_RelBlockY + 0.1) * 8.0), (int)((BlockZ + 0.5) * 8.0), 0.3F, 0.6F);
				}
				m_Chunk->SetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ, E_META_PRESSURE_PLATE_RAISED);
				m_World.WakeUpSimulators(BlockX, a_RelBlockY, BlockZ);
			}
			break;
		}
		default:
		{
			LOGD("Unimplemented pressure plate type %s in cRedstoneSimulator", ItemToFullString(a_MyType).c_str());
			break;
		}
	}
}





bool cIncrementalRedstoneSimulator::AreCoordsDirectlyPowered(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ)
{
	int BlockX = (m_Chunk->GetPosX() * cChunkDef::Width) + a_RelBlockX;
	int BlockZ = (m_Chunk->GetPosZ() * cChunkDef::Width) + a_RelBlockZ;

	PoweredBlocksList * Powered = m_Chunk->GetNeighborChunk(BlockX, BlockZ)->GetRedstoneSimulatorPoweredBlocksList(); // Torches want to access neighbour's data when on a wall
	for (PoweredBlocksList::const_iterator itr = Powered->begin(); itr != Powered->end(); ++itr) // Check powered list
	{
		if (itr->a_BlockPos.Equals(Vector3i(BlockX, a_RelBlockY, BlockZ)))
		{
			return true;
		}
	}
	return false;	
}





bool cIncrementalRedstoneSimulator::AreCoordsLinkedPowered(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ)
{
	int BlockX = (m_Chunk->GetPosX() * cChunkDef::Width) + a_RelBlockX;
	int BlockZ = (m_Chunk->GetPosZ() * cChunkDef::Width) + a_RelBlockZ;

	for (LinkedBlocksList::const_iterator itr = m_LinkedPoweredBlocks->begin(); itr != m_LinkedPoweredBlocks->end(); ++itr) // Check linked powered list
	{
		if (itr->a_BlockPos.Equals(Vector3i(BlockX, a_RelBlockY, BlockZ)))
		{
			return true;
		}
	}
	return false;
}





bool cIncrementalRedstoneSimulator::IsRepeaterPowered(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ, NIBBLETYPE a_Meta)
{
	// Repeaters cannot be powered by any face except their back; verify that this is true for a source
	int BlockX = (m_Chunk->GetPosX() * cChunkDef::Width) + a_RelBlockX;
	int BlockZ = (m_Chunk->GetPosZ() * cChunkDef::Width) + a_RelBlockZ;

	for (PoweredBlocksList::const_iterator itr = m_PoweredBlocks->begin(); itr != m_PoweredBlocks->end(); ++itr)
	{
		if (!itr->a_BlockPos.Equals(Vector3i(BlockX, a_RelBlockY, BlockZ))) { continue; }

		switch (a_Meta & 0x3)
		{
			case 0x0:
			{
				// Flip the coords to check the back of the repeater
				if (itr->a_SourcePos.Equals(Vector3i(BlockX, a_RelBlockY, BlockZ + 1))) { return true; }
				break;
			}
			case 0x1:
			{
				if (itr->a_SourcePos.Equals(Vector3i(BlockX - 1, a_RelBlockY, BlockZ))) { return true; }
				break;
			}
			case 0x2:
			{
				if (itr->a_SourcePos.Equals(Vector3i(BlockX, a_RelBlockY, BlockZ - 1))) { return true; }
				break;
			}
			case 0x3:
			{
				if (itr->a_SourcePos.Equals(Vector3i(BlockX + 1, a_RelBlockY, BlockZ))) { return true; }
				break;
			}
		}
	}

	for (LinkedBlocksList::const_iterator itr = m_LinkedPoweredBlocks->begin(); itr != m_LinkedPoweredBlocks->end(); ++itr)
	{
		if (!itr->a_BlockPos.Equals(Vector3i(BlockX, a_RelBlockY, BlockZ))) { continue; }

		switch (a_Meta & 0x3)
		{
			case 0x0:
			{
				if (itr->a_MiddlePos.Equals(Vector3i(BlockX, a_RelBlockY, BlockZ + 1))) { return true; }
				break;
			}
			case 0x1:
			{
				if (itr->a_MiddlePos.Equals(Vector3i(BlockX - 1, a_RelBlockY, BlockZ))) { return true; }
				break;
			}
			case 0x2:
			{
				if (itr->a_MiddlePos.Equals(Vector3i(BlockX, a_RelBlockY, BlockZ - 1))) { return true; }
				break;
			}
			case 0x3:
			{
				if (itr->a_MiddlePos.Equals(Vector3i(BlockX + 1, a_RelBlockY, BlockZ))) { return true; }
				break;
			}
		}
	}
	return false; // Couldn't find power source behind repeater
}





bool cIncrementalRedstoneSimulator::IsRepeaterLocked(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ, NIBBLETYPE a_Meta)
{	
	switch (a_Meta & 0x3) // We only want the 'direction' part of our metadata
	{
		// If the repeater is looking up or down (If parallel to the Z axis)
		case 0x0:
		case 0x2:
		{
			// Check if eastern(right) neighbor is a powered on repeater who is facing us
			BLOCKTYPE Block = 0;
			if (m_Chunk->UnboundedRelGetBlockType(a_RelBlockX + 1, a_RelBlockY, a_RelBlockZ, Block) && (Block == E_BLOCK_REDSTONE_REPEATER_ON)) // Is right neighbor a powered repeater?
			{
				NIBBLETYPE OtherRepeaterDir = m_Chunk->GetMeta(a_RelBlockX + 1, a_RelBlockY, a_RelBlockZ) & 0x3;
				if (OtherRepeaterDir == 0x3) { return true; } // If so, I am latched/locked
			}

			// Check if western(left) neighbor is a powered on repeater who is facing us
			if (m_Chunk->UnboundedRelGetBlockType(a_RelBlockX - 1, a_RelBlockY, a_RelBlockZ, Block) && (Block == E_BLOCK_REDSTONE_REPEATER_ON))
			{
				NIBBLETYPE OtherRepeaterDir = m_Chunk->GetMeta(a_RelBlockX -1, a_RelBlockY, a_RelBlockZ) & 0x3;
				if (OtherRepeaterDir == 0x1) { return true; } // If so, I am latched/locked
			}

			break;
		}

		// If the repeater is looking left or right (If parallel to the x axis)
		case 0x1:
		case 0x3:
		{
			// Check if southern(down) neighbor is a powered on repeater who is facing us
			BLOCKTYPE Block = 0;
			if (m_Chunk->UnboundedRelGetBlockType(a_RelBlockX, a_RelBlockY, a_RelBlockZ + 1, Block) && (Block == E_BLOCK_REDSTONE_REPEATER_ON))
			{ 
				NIBBLETYPE OtherRepeaterDir = m_Chunk->GetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ + 1) & 0x3;
				if (OtherRepeaterDir == 0x0) { return true; } // If so,  am latched/locked
			}
			
			// Check if northern(up) neighbor is a powered on repeater who is facing us
			if (m_Chunk->UnboundedRelGetBlockType(a_RelBlockX, a_RelBlockY, a_RelBlockZ - 1, Block) && (Block == E_BLOCK_REDSTONE_REPEATER_ON))
			{ 
				NIBBLETYPE OtherRepeaterDir = m_Chunk->GetMeta(a_RelBlockX, a_RelBlockY, a_RelBlockZ - 1) & 0x3;
				if (OtherRepeaterDir == 0x2) { return true; } // If so, I am latched/locked
			}

			break;
		}
	}

	return false; // None of the checks succeeded, I am not a locked repeater
}




bool cIncrementalRedstoneSimulator::IsPistonPowered(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ, NIBBLETYPE a_Meta)
{
	// Pistons cannot be powered through their front face; this function verifies that a source meets this requirement

	eBlockFace Face = cBlockPistonHandler::MetaDataToDirection(a_Meta);
	int BlockX = m_Chunk->GetPosX() * cChunkDef::Width + a_RelBlockX;
	int BlockZ = m_Chunk->GetPosZ() * cChunkDef::Width + a_RelBlockZ;

	for (PoweredBlocksList::const_iterator itr = m_PoweredBlocks->begin(); itr != m_PoweredBlocks->end(); ++itr)
	{
		if (!itr->a_BlockPos.Equals(Vector3i(BlockX, a_RelBlockY, BlockZ))) { continue; }

		AddFaceDirection(BlockX, a_RelBlockY, BlockZ, Face);

		if (!itr->a_SourcePos.Equals(Vector3i(BlockX, a_RelBlockY, BlockZ)))
		{
			return true;
		}

		AddFaceDirection(BlockX, a_RelBlockY, BlockZ, Face, true);
	}

	for (LinkedBlocksList::const_iterator itr = m_LinkedPoweredBlocks->begin(); itr != m_LinkedPoweredBlocks->end(); ++itr)
	{
		if (!itr->a_BlockPos.Equals(Vector3i(BlockX, a_RelBlockY, BlockZ))) { continue; }

		AddFaceDirection(BlockX, a_RelBlockY, BlockZ, Face);

		if (!itr->a_MiddlePos.Equals(Vector3i(BlockX, a_RelBlockY, BlockZ)))
		{
			return true;
		}

		AddFaceDirection(BlockX, a_RelBlockY, BlockZ, Face, true);
	}
	return false; // Source was in front of the piston's front face
}




bool cIncrementalRedstoneSimulator::IsWirePowered(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ, unsigned char & a_PowerLevel)
{
	a_PowerLevel = 0;
	int BlockX = (m_Chunk->GetPosX() * cChunkDef::Width) + a_RelBlockX;
	int BlockZ = (m_Chunk->GetPosZ() * cChunkDef::Width) + a_RelBlockZ;

	for (PoweredBlocksList::const_iterator itr = m_PoweredBlocks->begin(); itr != m_PoweredBlocks->end(); ++itr) // Check powered list
	{
		if (!itr->a_BlockPos.Equals(Vector3i(BlockX, a_RelBlockY, BlockZ)))
		{
			continue;
		}
		a_PowerLevel = itr->a_PowerLevel;
	}

	for (LinkedBlocksList::const_iterator itr = m_LinkedPoweredBlocks->begin(); itr != m_LinkedPoweredBlocks->end(); ++itr) // Check linked powered list
	{
		if (!itr->a_BlockPos.Equals(Vector3i(BlockX, a_RelBlockY, BlockZ)))
		{
			continue;
		}
		a_PowerLevel = itr->a_PowerLevel;
	}

	return (a_PowerLevel != 0); // Answer the inital question: is the wire powered?
}





bool cIncrementalRedstoneSimulator::AreCoordsSimulated(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ, bool IsCurrentStatePowered)
{
	for (SimulatedPlayerToggleableList::const_iterator itr = m_SimulatedPlayerToggleableBlocks->begin(); itr != m_SimulatedPlayerToggleableBlocks->end(); ++itr)
	{
		if (itr->a_RelBlockPos.Equals(Vector3i(a_RelBlockX, a_RelBlockY, a_RelBlockZ)))
		{
			if (itr->WasLastStatePowered != IsCurrentStatePowered) // Was the last power state different to the current?
			{
				return false; // It was, coordinates are no longer simulated
			}
			else
			{
				return true; // It wasn't, don't resimulate block, and allow players to toggle
			}
		}
	}
	return false; // Block wasn't even in the list, not simulated
}





void cIncrementalRedstoneSimulator::SetDirectionLinkedPowered(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ, char a_Direction, unsigned char a_PowerLevel)
{
	BLOCKTYPE MiddleBlock = 0;
	switch (a_Direction)
	{
		case BLOCK_FACE_XM:
		{
			if (!m_Chunk->UnboundedRelGetBlockType(a_RelBlockX - 1, a_RelBlockY, a_RelBlockZ, MiddleBlock))
			{
				return;
			}

			SetBlockLinkedPowered(a_RelBlockX - 2, a_RelBlockY, a_RelBlockZ, a_RelBlockX - 1, a_RelBlockY, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);
			SetBlockLinkedPowered(a_RelBlockX - 1, a_RelBlockY + 1, a_RelBlockZ, a_RelBlockX - 1, a_RelBlockY, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);
			SetBlockLinkedPowered(a_RelBlockX - 1, a_RelBlockY - 1, a_RelBlockZ, a_RelBlockX - 1, a_RelBlockY, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);
			SetBlockLinkedPowered(a_RelBlockX - 1, a_RelBlockY, a_RelBlockZ + 1, a_RelBlockX - 1, a_RelBlockY, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);
			SetBlockLinkedPowered(a_RelBlockX - 1, a_RelBlockY, a_RelBlockZ - 1, a_RelBlockX - 1, a_RelBlockY, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);

			break;
		}
		case BLOCK_FACE_XP:
		{
			if (!m_Chunk->UnboundedRelGetBlockType(a_RelBlockX + 1, a_RelBlockY, a_RelBlockZ, MiddleBlock))
			{
				return;
			}

			SetBlockLinkedPowered(a_RelBlockX + 2, a_RelBlockY, a_RelBlockZ, a_RelBlockX + 1, a_RelBlockY, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);
			SetBlockLinkedPowered(a_RelBlockX + 1, a_RelBlockY + 1, a_RelBlockZ, a_RelBlockX + 1, a_RelBlockY, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);
			SetBlockLinkedPowered(a_RelBlockX + 1, a_RelBlockY - 1, a_RelBlockZ, a_RelBlockX + 1, a_RelBlockY, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);
			SetBlockLinkedPowered(a_RelBlockX + 1, a_RelBlockY, a_RelBlockZ + 1, a_RelBlockX + 1, a_RelBlockY, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);
			SetBlockLinkedPowered(a_RelBlockX + 1, a_RelBlockY, a_RelBlockZ - 1, a_RelBlockX + 1, a_RelBlockY, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);

			break;
		}
		case BLOCK_FACE_YM:
		{
			if (!m_Chunk->UnboundedRelGetBlockType(a_RelBlockX, a_RelBlockY - 1, a_RelBlockZ, MiddleBlock))
			{
				return;
			}

			SetBlockLinkedPowered(a_RelBlockX, a_RelBlockY - 2, a_RelBlockZ, a_RelBlockX, a_RelBlockY - 1, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);
			SetBlockLinkedPowered(a_RelBlockX + 1, a_RelBlockY - 1, a_RelBlockZ, a_RelBlockX, a_RelBlockY - 1, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);
			SetBlockLinkedPowered(a_RelBlockX - 1, a_RelBlockY - 1, a_RelBlockZ, a_RelBlockX, a_RelBlockY - 1, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);
			SetBlockLinkedPowered(a_RelBlockX, a_RelBlockY - 1, a_RelBlockZ + 1, a_RelBlockX, a_RelBlockY - 1, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);
			SetBlockLinkedPowered(a_RelBlockX, a_RelBlockY - 1, a_RelBlockZ - 1, a_RelBlockX, a_RelBlockY - 1, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);

			break;
		}
		case BLOCK_FACE_YP:
		{
			if (!m_Chunk->UnboundedRelGetBlockType(a_RelBlockX, a_RelBlockY + 1, a_RelBlockZ, MiddleBlock))
			{
				return;
			}

			SetBlockLinkedPowered(a_RelBlockX, a_RelBlockY + 2, a_RelBlockZ, a_RelBlockX, a_RelBlockY + 1, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);
			SetBlockLinkedPowered(a_RelBlockX + 1, a_RelBlockY + 1, a_RelBlockZ, a_RelBlockX, a_RelBlockY + 1, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);
			SetBlockLinkedPowered(a_RelBlockX - 1, a_RelBlockY + 1, a_RelBlockZ, a_RelBlockX, a_RelBlockY + 1, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);
			SetBlockLinkedPowered(a_RelBlockX, a_RelBlockY + 1, a_RelBlockZ + 1, a_RelBlockX, a_RelBlockY + 1, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);
			SetBlockLinkedPowered(a_RelBlockX, a_RelBlockY + 1, a_RelBlockZ - 1, a_RelBlockX, a_RelBlockY + 1, a_RelBlockZ, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);

			break;
		}
		case BLOCK_FACE_ZM:
		{
			if (!m_Chunk->UnboundedRelGetBlockType(a_RelBlockX, a_RelBlockY, a_RelBlockZ - 1, MiddleBlock))
			{
				return;
			}
						
			SetBlockLinkedPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ - 2, a_RelBlockX, a_RelBlockY, a_RelBlockZ - 1, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);
			SetBlockLinkedPowered(a_RelBlockX + 1, a_RelBlockY, a_RelBlockZ - 1, a_RelBlockX, a_RelBlockY, a_RelBlockZ - 1, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);
			SetBlockLinkedPowered(a_RelBlockX - 1, a_RelBlockY, a_RelBlockZ - 1, a_RelBlockX, a_RelBlockY, a_RelBlockZ - 1, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);
			SetBlockLinkedPowered(a_RelBlockX, a_RelBlockY + 1, a_RelBlockZ - 1, a_RelBlockX, a_RelBlockY, a_RelBlockZ - 1, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);
			SetBlockLinkedPowered(a_RelBlockX, a_RelBlockY - 1, a_RelBlockZ - 1, a_RelBlockX, a_RelBlockY, a_RelBlockZ - 1, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);

			break;
		}
		case BLOCK_FACE_ZP:
		{
			if (!m_Chunk->UnboundedRelGetBlockType(a_RelBlockX, a_RelBlockY, a_RelBlockZ + 1, MiddleBlock))
			{
				return;
			}
			
			SetBlockLinkedPowered(a_RelBlockX, a_RelBlockY, a_RelBlockZ + 2, a_RelBlockX, a_RelBlockY, a_RelBlockZ + 1, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);
			SetBlockLinkedPowered(a_RelBlockX + 1, a_RelBlockY, a_RelBlockZ + 1, a_RelBlockX, a_RelBlockY, a_RelBlockZ + 1, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);
			SetBlockLinkedPowered(a_RelBlockX - 1, a_RelBlockY, a_RelBlockZ + 1, a_RelBlockX, a_RelBlockY, a_RelBlockZ + 1, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);
			SetBlockLinkedPowered(a_RelBlockX, a_RelBlockY + 1, a_RelBlockZ + 1, a_RelBlockX, a_RelBlockY, a_RelBlockZ + 1, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);
			SetBlockLinkedPowered(a_RelBlockX, a_RelBlockY - 1, a_RelBlockZ + 1, a_RelBlockX, a_RelBlockY, a_RelBlockZ + 1, a_RelBlockX, a_RelBlockY, a_RelBlockZ, MiddleBlock, a_PowerLevel);

			break;
		}
		default:
		{
			ASSERT(!"Unhandled face direction when attempting to set blocks as linked powered!"); // Zombies, that wasn't supposed to happen...
			break;
		}
	}
}





void cIncrementalRedstoneSimulator::SetAllDirsAsPowered(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ, unsigned char a_PowerLevel)
{
	static const struct
	{
		int x, y, z;
	} gCrossCoords[] =
	{
		{ 1, 0, 0 },
		{ -1, 0, 0 },
		{ 0, 0, 1 },
		{ 0, 0, -1 },
		{ 0, 1, 0 },
		{ 0, -1, 0 }
	};

	for (size_t i = 0; i < ARRAYCOUNT(gCrossCoords); i++) // Loop through struct to power all directions
	{
		SetBlockPowered(a_RelBlockX + gCrossCoords[i].x, a_RelBlockY + gCrossCoords[i].y, a_RelBlockZ + gCrossCoords[i].z, a_RelBlockX, a_RelBlockY, a_RelBlockZ, a_PowerLevel);
	}
}





void cIncrementalRedstoneSimulator::SetBlockPowered(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ, int a_RelSourceX, int a_RelSourceY, int a_RelSourceZ, unsigned char a_PowerLevel)
{
	int BlockX = (m_Chunk->GetPosX() * cChunkDef::Width) + a_RelBlockX;
	int BlockZ = (m_Chunk->GetPosZ() * cChunkDef::Width) + a_RelBlockZ;
	int SourceX = (m_Chunk->GetPosX() * cChunkDef::Width) + a_RelSourceX;
	int SourceZ = (m_Chunk->GetPosZ() * cChunkDef::Width) + a_RelSourceZ;

	BLOCKTYPE Block = 0;
	if (!m_Chunk->UnboundedRelGetBlockType(a_RelBlockX, a_RelBlockY, a_RelBlockZ, Block))
	{
		return;
	}
	if (Block == E_BLOCK_AIR)
	{
		// Don't set air, fixes some bugs (wires powering themselves)
		return;
	}

	cChunk * Neighbour = m_Chunk->GetNeighborChunk(BlockX, BlockZ);
	PoweredBlocksList * Powered = Neighbour->GetRedstoneSimulatorPoweredBlocksList();
	for (PoweredBlocksList::iterator itr = Powered->begin(); itr != Powered->end(); ++itr)  // Check powered list
	{
		if (
			itr->a_BlockPos.Equals(Vector3i(BlockX, a_RelBlockY, BlockZ)) &&
			itr->a_SourcePos.Equals(Vector3i(SourceX, a_RelSourceY, SourceZ))
			)
		{
			// Check for duplicates, update power level, don't add a new listing
			itr->a_PowerLevel = a_PowerLevel;
			return;
		}
	}

	PoweredBlocksList * OtherPowered = m_Chunk->GetNeighborChunk(SourceX, SourceZ)->GetRedstoneSimulatorPoweredBlocksList();
	for (PoweredBlocksList::const_iterator itr = OtherPowered->begin(); itr != OtherPowered->end(); ++itr)  // Check powered list
	{
		if (
			itr->a_BlockPos.Equals(Vector3i(SourceX, a_RelSourceY, SourceZ)) &&
			itr->a_SourcePos.Equals(Vector3i(BlockX, a_RelBlockY, BlockZ))
			)
		{
			// Powered wires try to power their source - don't let them!
			return;
		}
	}

	sPoweredBlocks RC;
	RC.a_BlockPos = Vector3i(BlockX, a_RelBlockY, BlockZ);
	RC.a_SourcePos = Vector3i(SourceX, a_RelSourceY, SourceZ);
	RC.a_PowerLevel = a_PowerLevel;
	Powered->push_back(RC);
	Neighbour->SetIsRedstoneDirty(true);
	m_Chunk->SetIsRedstoneDirty(true);
}





void cIncrementalRedstoneSimulator::SetBlockLinkedPowered(
	int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ,
	int a_RelMiddleX, int a_RelMiddleY, int a_RelMiddleZ,
	int a_RelSourceX, int a_RelSourceY, int a_RelSourceZ,
	BLOCKTYPE a_MiddleBlock, unsigned char a_PowerLevel
	)
{
	int BlockX = (m_Chunk->GetPosX() * cChunkDef::Width) + a_RelBlockX;
	int BlockZ = (m_Chunk->GetPosZ() * cChunkDef::Width) + a_RelBlockZ;
	int MiddleX = (m_Chunk->GetPosX() * cChunkDef::Width) + a_RelMiddleX;
	int MiddleZ = (m_Chunk->GetPosZ() * cChunkDef::Width) + a_RelMiddleZ;
	int SourceX = (m_Chunk->GetPosX() * cChunkDef::Width) + a_RelSourceX;
	int SourceZ = (m_Chunk->GetPosZ() * cChunkDef::Width) + a_RelSourceZ;

	BLOCKTYPE DestBlock = 0;
	if (!m_Chunk->UnboundedRelGetBlockType(a_RelBlockX, a_RelBlockY, a_RelBlockZ, DestBlock))
	{
		return;
	}
	if (DestBlock == E_BLOCK_AIR)
	{
		// Don't set air, fixes some bugs (wires powering themselves)
		return;
	}
	if ((DestBlock == E_BLOCK_REDSTONE_WIRE) && (m_Chunk->GetBlock(a_RelSourceX, a_RelSourceY, a_RelSourceZ) == E_BLOCK_REDSTONE_WIRE))
	{
		return;
	}
	if (!IsViableMiddleBlock(a_MiddleBlock))
	{
		return;
	}

	cChunk * Neighbour = m_Chunk->GetNeighborChunk(BlockX, BlockZ);
	LinkedBlocksList * Linked = Neighbour->GetRedstoneSimulatorLinkedBlocksList();
	for (LinkedBlocksList::iterator itr = Linked->begin(); itr != Linked->end(); ++itr)  // Check linked powered list
	{
		if (
			itr->a_BlockPos.Equals(Vector3i(BlockX, a_RelBlockY, BlockZ)) &&
			itr->a_MiddlePos.Equals(Vector3i(MiddleX, a_RelMiddleY, MiddleZ)) &&
			itr->a_SourcePos.Equals(Vector3i(SourceX, a_RelSourceY, SourceZ))
		)
		{
			// Check for duplicates, update power level, don't add a new listing
			itr->a_PowerLevel = a_PowerLevel;
			return;
		}
	}

	sLinkedPoweredBlocks RC;
	RC.a_BlockPos = Vector3i(BlockX, a_RelBlockY, BlockZ);
	RC.a_MiddlePos = Vector3i(MiddleX, a_RelMiddleY, MiddleZ);
	RC.a_SourcePos = Vector3i(SourceX, a_RelSourceY, SourceZ);
	RC.a_PowerLevel = a_PowerLevel;
	Linked->push_back(RC);
	Neighbour->SetIsRedstoneDirty(true);
	m_Chunk->SetIsRedstoneDirty(true);
}





void cIncrementalRedstoneSimulator::SetPlayerToggleableBlockAsSimulated(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ, bool WasLastStatePowered)
{
	for (SimulatedPlayerToggleableList::iterator itr = m_SimulatedPlayerToggleableBlocks->begin(); itr != m_SimulatedPlayerToggleableBlocks->end(); ++itr)
	{
		if (!itr->a_RelBlockPos.Equals(Vector3i(a_RelBlockX, a_RelBlockY, a_RelBlockZ)))
		{
			continue;
		}

		if (itr->WasLastStatePowered != WasLastStatePowered)
		{
			// If power states different, update listing
			itr->WasLastStatePowered = WasLastStatePowered;
			return;
		}
		else
		{
			// If states the same, just ignore
			return;
		}
	}

	// We have arrive here; no block must be in list - add one
	sSimulatedPlayerToggleableList RC;
	RC.a_RelBlockPos = Vector3i(a_RelBlockX, a_RelBlockY, a_RelBlockZ);
	RC.WasLastStatePowered = WasLastStatePowered;
	m_SimulatedPlayerToggleableBlocks->push_back(RC);
}





bool cIncrementalRedstoneSimulator::QueueRepeaterPowerChange(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ, NIBBLETYPE a_Meta, bool ShouldPowerOn)
{
	for (RepeatersDelayList::iterator itr = m_RepeatersDelayList->begin(); itr != m_RepeatersDelayList->end(); ++itr)
	{
		if (itr->a_RelBlockPos.Equals(Vector3i(a_RelBlockX, a_RelBlockY, a_RelBlockZ)))
		{
			if (ShouldPowerOn == itr->ShouldPowerOn) // We are queued already for the same thing, don't replace entry
			{
				return false;
			}

			// Already in here (normal to allow repeater to continue on powering and updating blocks in front) - just update info and quit
			itr->a_DelayTicks = (((a_Meta & 0xC) >> 0x2) + 1) * 2; // See below for description
			itr->a_ElapsedTicks = 0;
			itr->ShouldPowerOn = ShouldPowerOn;
			return false;
		}
	}

	// Self not in list, add self to list
	sRepeatersDelayList RC;	
	RC.a_RelBlockPos = Vector3i(a_RelBlockX, a_RelBlockY, a_RelBlockZ);
	
	// Gets the top two bits (delay time), shifts them into the lower two bits, and adds one (meta 0 = 1 tick; 1 = 2 etc.)
	// * 2 because in MCS, 1 redstone tick = 1 world tick, but in Vanilla, 1 redstone tick = 2 world ticks, and we need to maintain compatibility
	RC.a_DelayTicks = (((a_Meta & 0xC) >> 0x2) + 1) * 2;

	RC.a_ElapsedTicks = 0;
	RC.ShouldPowerOn = ShouldPowerOn;
	m_RepeatersDelayList->push_back(RC);
	return true;
}





cIncrementalRedstoneSimulator::eRedstoneDirection cIncrementalRedstoneSimulator::GetWireDirection(int a_RelBlockX, int a_RelBlockY, int a_RelBlockZ)
{
	int Dir = REDSTONE_NONE;

	BLOCKTYPE NegX = 0;
	if (m_Chunk->UnboundedRelGetBlockType(a_RelBlockX - 1, a_RelBlockY, a_RelBlockZ, NegX))
	{
		if (IsPotentialSource(NegX))
		{
			Dir |= (REDSTONE_X_POS);
		}
	}
	
	BLOCKTYPE PosX = 0;
	if (m_Chunk->UnboundedRelGetBlockType(a_RelBlockX + 1, a_RelBlockY, a_RelBlockZ, PosX))
	{
		if (IsPotentialSource(PosX))
		{
			Dir |= (REDSTONE_X_NEG);
		}
	}
	
	BLOCKTYPE NegZ = 0;
	if (m_Chunk->UnboundedRelGetBlockType(a_RelBlockX, a_RelBlockY, a_RelBlockZ - 1, NegZ))
	{
		if (IsPotentialSource(NegZ))
		{
			if ((Dir & REDSTONE_X_POS) && !(Dir & REDSTONE_X_NEG))  // corner
			{
				Dir ^= REDSTONE_X_POS;
				Dir |= REDSTONE_X_NEG;
			}
			if ((Dir & REDSTONE_X_NEG) && !(Dir & REDSTONE_X_POS))  // corner
			{
				Dir ^= REDSTONE_X_NEG;
				Dir |= REDSTONE_X_POS;
			}
			Dir |= REDSTONE_Z_POS;
		}
	}
	
	BLOCKTYPE PosZ = 0;
	if (m_Chunk->UnboundedRelGetBlockType(a_RelBlockX, a_RelBlockY, a_RelBlockZ + 1, PosZ))
	{
		if (IsPotentialSource(PosZ))
		{
			if ((Dir & REDSTONE_X_POS) && !(Dir & REDSTONE_X_NEG))  // corner
			{
				Dir ^= REDSTONE_X_POS;
				Dir |= REDSTONE_X_NEG;
			}
			if ((Dir & REDSTONE_X_NEG) && !(Dir & REDSTONE_X_POS))  // corner
			{
				Dir ^= REDSTONE_X_NEG;
				Dir |= REDSTONE_X_POS;
			}
			Dir |= REDSTONE_Z_NEG;
		}
	}
	return (eRedstoneDirection)Dir;
}





bool cIncrementalRedstoneSimulator::IsLeverOn(NIBBLETYPE a_BlockMeta)
{
	// Extract the ON bit from metadata and return if true if it is set:
	return ((a_BlockMeta & 0x8) == 0x8);
}