cuberite-2a/src/Chunk.h

#pragma once

#include "Entities/Entity.h"
#include "ChunkDef.h"
#include "ChunkData.h"

#include "Simulator/FireSimulator.h"
#include "Simulator/SandSimulator.h"
#include "Simulator/IncrementalRedstoneSimulator.h"





namespace Json
{
	class Value;
};





class cWorld;
class cClientHandle;
class cServer;
class MTRand;
class cPlayer;
class cChunkMap;
class cChestEntity;
class cDispenserEntity;
class cFurnaceEntity;
class cNoteEntity;
class cMobHeadEntity;
class cFlowerPotEntity;
class cBlockArea;
class cPawn;
class cPickup;
class cChunkDataSerializer;
class cBlockArea;
class cFluidSimulatorData;
class cMobCensus;
class cMobSpawner;

typedef std::list<cClientHandle *>         cClientHandleList;
typedef cItemCallback<cEntity>             cEntityCallback;
typedef cItemCallback<cChestEntity>        cChestCallback;
typedef cItemCallback<cDispenserEntity>    cDispenserCallback;
typedef cItemCallback<cFurnaceEntity>      cFurnaceCallback;
typedef cItemCallback<cNoteEntity>         cNoteBlockCallback;
typedef cItemCallback<cCommandBlockEntity> cCommandBlockCallback;
typedef cItemCallback<cMobHeadEntity>      cMobHeadCallback;
typedef cItemCallback<cFlowerPotEntity>    cFlowerPotCallback;




// This class is not to be used directly
// Instead, call actions on cChunkMap (such as cChunkMap::SetBlock() etc.)
class cChunk :
	public cChunkDef  // The inheritance is "misused" here only to inherit the functions and constants defined in cChunkDef
{
public:
	cChunk(
		int a_ChunkX, int a_ChunkY, int a_ChunkZ,   // Chunk coords
		cChunkMap * a_ChunkMap, cWorld * a_World,   // Parent objects
		cChunk * a_NeighborXM, cChunk * a_NeighborXP, cChunk * a_NeighborZM, cChunk * a_NeighborZP  // Neighbor chunks
	);
	cChunk(cChunk & other);
	~cChunk();

	bool IsValid(void) const {return m_IsValid; }  // Returns true if the chunk block data is valid (loaded / generated)
	void SetValid(void);                           // Also wakes up any calls to cChunkMap::GetHeight()
	void MarkRegenerating(void);                   // Marks all clients attached to this chunk as wanting this chunk
	bool IsDirty(void) const {return m_IsDirty; }  // Returns true if the chunk has changed since it was last saved
	bool HasLoadFailed(void) const {return m_HasLoadFailed; }  // Returns true if the chunk failed to load and hasn't been generated since then
	bool CanUnload(void);
	
	bool IsLightValid(void) const {return m_IsLightValid; }
	
	/*
	To save a chunk, the WSSchema must:
	1. Mark the chunk as being saved (MarkSaving() )
	2. Get the chunk's data using GetAllData()
	3. Mark the chunk as saved (MarkSaved() )
	If anywhere inside this sequence another thread mmodifies the chunk, the chunk will not get marked as saved in MarkSaved()
	*/
	void MarkSaving(void);  // Marks the chunk as being saved. 
	void MarkSaved(void);  // Marks the chunk as saved, if it didn't change from the last call to MarkSaving()
	void MarkLoaded(void);  // Marks the chunk as freshly loaded. Fails if the chunk is already valid
	void MarkLoadFailed(void);  // Marks the chunk as failed to load. Ignored is the chunk is already valid
	
	/** Gets all chunk data, calls the a_Callback's methods for each data type */
	void GetAllData(cChunkDataCallback & a_Callback);
	
	/** Sets all chunk data */
	void SetAllData(
		const BLOCKTYPE *  a_BlockTypes, 
		const NIBBLETYPE * a_BlockMeta,
		const NIBBLETYPE * a_BlockLight,
		const NIBBLETYPE * a_BlockSkyLight,
		const cChunkDef::HeightMap * a_HeightMap,
		const cChunkDef::BiomeMap &  a_BiomeMap,
		cBlockEntityList & a_BlockEntities
	);
	
	void SetLight(
		const cChunkDef::BlockNibbles & a_BlockLight,
		const cChunkDef::BlockNibbles & a_SkyLight
	);
	
	/** Copies m_BlockData into a_BlockTypes, only the block types */
	void GetBlockTypes(BLOCKTYPE  * a_BlockTypes);
	
	/** Writes the specified cBlockArea at the coords specified. Note that the coords may extend beyond the chunk! */
	void WriteBlockArea(cBlockArea & a_Area, int a_MinBlockX, int a_MinBlockY, int a_MinBlockZ, int a_DataTypes);

	/** Returns true if there is a block entity at the coords specified */
	bool HasBlockEntityAt(int a_BlockX, int a_BlockY, int a_BlockZ);
	
	/** Sets or resets the internal flag that prevents chunk from being unloaded.
	The flag is cumulative - it can be set multiple times and then needs to be un-set that many times
	before the chunk is unloadable again. */
	void Stay(bool a_Stay = true);
	
	/** Recence all mobs proximities to players in order to know what to do with them */
	void CollectMobCensus(cMobCensus& toFill);

	/** Try to Spawn Monsters inside chunk */
	void SpawnMobs(cMobSpawner& a_MobSpawner);

	void Tick(float a_Dt);
	
	/** Ticks a single block. Used by cWorld::TickQueuedBlocks() to tick the queued blocks */
	void TickBlock(int a_RelX, int a_RelY, int a_RelZ);

	int GetPosX(void) const { return m_PosX; }
	int GetPosY(void) const { return m_PosY; }
	int GetPosZ(void) const { return m_PosZ; }
	
	cWorld * GetWorld(void) const { return m_World; }

	void SetBlock(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, bool a_SendToClients = true);
	// SetBlock() does a lot of work (heightmap, tickblocks, blockentities) so a BlockIdx version doesn't make sense
	void SetBlock( const Vector3i & a_RelBlockPos, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta ) { SetBlock( a_RelBlockPos.x, a_RelBlockPos.y, a_RelBlockPos.z, a_BlockType, a_BlockMeta ); }
	
	/** Queues a block change till the specified world tick */
	void QueueSetBlock(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, Int64 a_Tick, BLOCKTYPE a_PreviousBlockType = E_BLOCK_AIR);
	
	/** Queues block for ticking (m_ToTickQueue) */
	void QueueTickBlock(int a_RelX, int a_RelY, int a_RelZ);
	
	/** Queues all 6 neighbors of the specified block for ticking (m_ToTickQueue). If any are outside the chunk, relays the checking to the proper neighboring chunk */
	void QueueTickBlockNeighbors(int a_RelX, int a_RelY, int a_RelZ);

	void FastSetBlock(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockType, BLOCKTYPE a_BlockMeta, bool a_SendToClients = true);  // Doesn't force block updates on neighbors, use for simple changes such as grass growing etc.
	BLOCKTYPE GetBlock(int a_RelX, int a_RelY, int a_RelZ) const;
	BLOCKTYPE GetBlock(Vector3i a_cords) const { return GetBlock(a_cords.x, a_cords.y, a_cords.z);}
	void      GetBlockTypeMeta(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta);
	void      GetBlockInfo    (int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_Meta, NIBBLETYPE & a_SkyLight, NIBBLETYPE & a_BlockLight);
	
	/** Returns the chunk into which the specified block belongs, by walking the neighbors.
	Will return self if appropriate. Returns NULL if not reachable through neighbors.
	*/
	cChunk * GetNeighborChunk(int a_BlockX, int a_BlockZ);
	
	/**
	Returns the chunk into which the relatively-specified block belongs, by walking the neighbors.
	Will return self if appropriate. Returns NULL if not reachable through neighbors.
	*/
	cChunk * GetRelNeighborChunk(int a_RelX, int a_RelZ);
	
	/**
	Returns the chunk into which the relatively-specified block belongs.
	Also modifies the relative coords from this-relative to return-relative.
	Will return self if appropriate.
	Will try walking the neighbors first; if that fails, will query the chunkmap
	*/
	cChunk * GetRelNeighborChunkAdjustCoords(int & a_RelX, int & a_RelZ) const;
	
	EMCSBiome GetBiomeAt(int a_RelX, int a_RelZ) const {return cChunkDef::GetBiome(m_BiomeMap, a_RelX, a_RelZ); }
	
	/** Sets the biome at the specified relative coords.
	Doesn't resend the chunk to clients. */
	void SetBiomeAt(int a_RelX, int a_RelZ, EMCSBiome a_Biome);
	
	/** Sets the biome in the specified relative coords area. All the coords are inclusive.
	Sends the chunk to all relevant clients. */
	void SetAreaBiome(int a_MinRelX, int a_MaxRelX, int a_MinRelZ, int a_MaxRelZ, EMCSBiome a_Biome);
	
	void CollectPickupsByPlayer(cPlayer * a_Player);
	
	/** Sets the sign text. Returns true if successful. Also sends update packets to all clients in the chunk */
	bool SetSignLines(int a_RelX, int a_RelY, int a_RelZ, const AString & a_Line1, const AString & a_Line2, const AString & a_Line3, const AString & a_Line4);

	int  GetHeight( int a_X, int a_Z );

	void SendBlockTo(int a_RelX, int a_RelY, int a_RelZ, cClientHandle * a_Client);

	/** Adds a client to the chunk; returns true if added, false if already there */
	bool AddClient    (cClientHandle* a_Client );
	
	void RemoveClient (cClientHandle* a_Client );
	bool HasClient    (cClientHandle* a_Client );
	bool HasAnyClients(void);  // Returns true if theres any client in the chunk; false otherwise

	void AddEntity(cEntity * a_Entity);
	void RemoveEntity(cEntity * a_Entity);
	bool HasEntity(int a_EntityID);
	
	/** Calls the callback for each entity; returns true if all entities processed, false if the callback aborted by returning true */
	bool ForEachEntity(cEntityCallback & a_Callback);  // Lua-accessible

	/** Calls the callback if the entity with the specified ID is found, with the entity object as the callback param. Returns true if entity found. */
	bool DoWithEntityByID(int a_EntityID, cEntityCallback & a_Callback, bool & a_CallbackResult);  // Lua-accessible

	/** Calls the callback for each block entity; returns true if all block entities processed, false if the callback aborted by returning true */
	bool ForEachBlockEntity(cBlockEntityCallback & a_Callback);  // Lua-accessible

	/** Calls the callback for each chest; returns true if all chests processed, false if the callback aborted by returning true */
	bool ForEachChest(cChestCallback & a_Callback);  // Lua-accessible

	/** Calls the callback for each dispenser; returns true if all dispensers processed, false if the callback aborted by returning true */
	bool ForEachDispenser(cDispenserCallback & a_Callback);

	/** Calls the callback for each dropper; returns true if all droppers processed, false if the callback aborted by returning true */
	bool ForEachDropper(cDropperCallback & a_Callback);

	/** Calls the callback for each dropspenser; returns true if all dropspensers processed, false if the callback aborted by returning true */
	bool ForEachDropSpenser(cDropSpenserCallback & a_Callback);

	/** Calls the callback for each furnace; returns true if all furnaces processed, false if the callback aborted by returning true */
	bool ForEachFurnace(cFurnaceCallback & a_Callback);  // Lua-accessible
	
	/** Calls the callback for the block entity at the specified coords; returns false if there's no block entity at those coords, true if found */
	bool DoWithBlockEntityAt(int a_BlockX, int a_BlockY, int a_BlockZ, cBlockEntityCallback & a_Callback);  // Lua-acessible

	/** Calls the callback for the chest at the specified coords; returns false if there's no chest at those coords, true if found */
	bool DoWithChestAt(int a_BlockX, int a_BlockY, int a_BlockZ, cChestCallback & a_Callback);  // Lua-acessible

	/** Calls the callback for the dispenser at the specified coords; returns false if there's no dispenser at those coords or callback returns true, returns true if found */
	bool DoWithDispenserAt(int a_BlockX, int a_BlockY, int a_BlockZ, cDispenserCallback & a_Callback);

	/** Calls the callback for the dispenser at the specified coords; returns false if there's no dropper at those coords or callback returns true, returns true if found */
	bool DoWithDropperAt(int a_BlockX, int a_BlockY, int a_BlockZ, cDropperCallback & a_Callback);

	/** Calls the callback for the dispenser at the specified coords; returns false if there's no dropspenser at those coords or callback returns true, returns true if found */
	bool DoWithDropSpenserAt(int a_BlockX, int a_BlockY, int a_BlockZ, cDropSpenserCallback & a_Callback);

	/** Calls the callback for the furnace at the specified coords; returns false if there's no furnace at those coords or callback returns true, returns true if found */
	bool DoWithFurnaceAt(int a_BlockX, int a_BlockY, int a_BlockZ, cFurnaceCallback & a_Callback);  // Lua-accessible

	/** Calls the callback for the noteblock at the specified coords; returns false if there's no noteblock at those coords or callback returns true, returns true if found */
	bool DoWithNoteBlockAt(int a_BlockX, int a_BlockY, int a_BlockZ, cNoteBlockCallback & a_Callback);

	/** Calls the callback for the command block at the specified coords; returns false if there's no command block at those coords or callback returns true, returns true if found */
	bool DoWithCommandBlockAt(int a_BlockX, int a_BlockY, int a_BlockZ, cCommandBlockCallback & a_Callback);
	
	/** Calls the callback for the mob head block at the specified coords; returns false if there's no mob head block at those coords or callback returns true, returns true if found */
	bool DoWithMobHeadAt(int a_BlockX, int a_BlockY, int a_BlockZ, cMobHeadCallback & a_Callback);

	/** Calls the callback for the flower pot at the specified coords; returns false if there's no flower pot at those coords or callback returns true, returns true if found */
	bool DoWithFlowerPotAt(int a_BlockX, int a_BlockY, int a_BlockZ, cFlowerPotCallback & a_Callback);

	/** Retrieves the test on the sign at the specified coords; returns false if there's no sign at those coords, true if found */
	bool GetSignLines (int a_BlockX, int a_BlockY, int a_BlockZ, AString & a_Line1, AString & a_Line2, AString & a_Line3, AString & a_Line4);  // Lua-accessible

	void UseBlockEntity(cPlayer * a_Player, int a_X, int a_Y, int a_Z);  // [x, y, z] in world block coords

	void CalculateLighting(); // Recalculate right now
	void CalculateHeightmap(const BLOCKTYPE * a_BlockTypes);

	// Broadcast various packets to all clients of this chunk:
	// (Please keep these alpha-sorted)
	void BroadcastAttachEntity       (const cEntity & a_Entity, const cEntity * a_Vehicle);
	void BroadcastBlockAction        (int a_BlockX, int a_BlockY, int a_BlockZ, char a_Byte1, char a_Byte2, BLOCKTYPE a_BlockType, const cClientHandle * a_Exclude = NULL);
	void BroadcastBlockBreakAnimation(int a_EntityID, int a_BlockX, int a_BlockY, int a_BlockZ, char a_Stage, const cClientHandle * a_Exclude = NULL);
	void BroadcastBlockEntity        (int a_BlockX, int a_BlockY, int a_BlockZ, const cClientHandle * a_Exclude = NULL);
	void BroadcastChunkData          (cChunkDataSerializer & a_Serializer, const cClientHandle * a_Exclude = NULL);
	void BroadcastCollectPickup      (const cPickup & a_Pickup, const cPlayer & a_Player, const cClientHandle * a_Exclude = NULL);
	void BroadcastDestroyEntity      (const cEntity & a_Entity, const cClientHandle * a_Exclude = NULL);
	void BroadcastEntityEffect       (const cEntity & a_Entity, int a_EffectID, int a_Amplifier, short a_Duration, const cClientHandle * a_Exclude = NULL);
	void BroadcastEntityEquipment    (const cEntity & a_Entity, short a_SlotNum, const cItem & a_Item, const cClientHandle * a_Exclude = NULL);
	void BroadcastEntityHeadLook     (const cEntity & a_Entity, const cClientHandle * a_Exclude = NULL);
	void BroadcastEntityLook         (const cEntity & a_Entity, const cClientHandle * a_Exclude = NULL);
	void BroadcastEntityMetadata     (const cEntity & a_Entity, const cClientHandle * a_Exclude = NULL);
	void BroadcastEntityRelMove      (const cEntity & a_Entity, char a_RelX, char a_RelY, char a_RelZ, const cClientHandle * a_Exclude = NULL);
	void BroadcastEntityRelMoveLook  (const cEntity & a_Entity, char a_RelX, char a_RelY, char a_RelZ, const cClientHandle * a_Exclude = NULL);
	void BroadcastEntityStatus       (const cEntity & a_Entity, char a_Status, const cClientHandle * a_Exclude = NULL);
	void BroadcastEntityVelocity     (const cEntity & a_Entity, const cClientHandle * a_Exclude = NULL);
	void BroadcastEntityAnimation    (const cEntity & a_Entity, char a_Animation, const cClientHandle * a_Exclude = NULL);
	void BroadcastParticleEffect     (const AString & a_ParticleName, float a_SrcX, float a_SrcY, float a_SrcZ, float a_OffsetX, float a_OffsetY, float a_OffsetZ, float a_ParticleData, int a_ParticleAmmount, cClientHandle * a_Exclude = NULL);
	void BroadcastRemoveEntityEffect (const cEntity & a_Entity, int a_EffectID, const cClientHandle * a_Exclude = NULL);
	void BroadcastSoundEffect        (const AString & a_SoundName, int a_SrcX, int a_SrcY, int a_SrcZ, float a_Volume, float a_Pitch, const cClientHandle * a_Exclude = NULL);  // a_Src coords are Block * 8
	void BroadcastSoundParticleEffect(int a_EffectID, int a_SrcX, int a_SrcY, int a_SrcZ, int a_Data, const cClientHandle * a_Exclude = NULL);
	void BroadcastSpawnEntity        (cEntity & a_Entity, const cClientHandle * a_Exclude = NULL);
	void BroadcastThunderbolt        (int a_BlockX, int a_BlockY, int a_BlockZ, const cClientHandle * a_Exclude = NULL);
	void BroadcastUseBed             (const cEntity & a_Entity, int a_BlockX, int a_BlockY, int a_BlockZ );
	
	void SendBlockEntity             (int a_BlockX, int a_BlockY, int a_BlockZ, cClientHandle & a_Client);

	Vector3i PositionToWorldPosition(const Vector3i & a_RelPos)
	{
		return PositionToWorldPosition(a_RelPos.x, a_RelPos.y, a_RelPos.z);
	}
	
	void     PositionToWorldPosition(int a_RelX, int a_RelY, int a_RelZ, int & a_BlockX, int & a_BlockY, int & a_BlockZ);
	Vector3i PositionToWorldPosition(int a_RelX, int a_RelY, int a_RelZ );

	inline void MarkDirty(void)
	{
		m_IsDirty = true;
		m_IsSaving = false;
	}
	
	/** Sets the blockticking to start at the specified block. Only one blocktick may be set, second call overwrites the first call */
	inline void SetNextBlockTick(int a_RelX, int a_RelY, int a_RelZ)
	{
		m_BlockTickX = a_RelX;
		m_BlockTickY = a_RelY;
		m_BlockTickZ = a_RelZ;
	}
	
	inline NIBBLETYPE GetMeta(int a_RelX, int a_RelY, int a_RelZ) const
	{
		return m_ChunkData.GetMeta(a_RelX, a_RelY, a_RelZ);
	}
	inline void       SetMeta(int a_RelX, int a_RelY, int a_RelZ, NIBBLETYPE a_Meta)
	{
			bool hasChanged = m_ChunkData.SetMeta(a_RelX, a_RelY, a_RelZ, a_Meta);
			if (hasChanged)
			{
				MarkDirty();
				
				m_PendingSendBlocks.push_back(sSetBlock(m_PosX, m_PosZ, a_RelX, a_RelY, a_RelZ, GetBlock(a_RelX, a_RelY, a_RelZ), a_Meta));
			}
	}

	inline NIBBLETYPE GetBlockLight(int a_RelX, int a_RelY, int a_RelZ) const {return m_ChunkData.GetBlockLight(a_RelX, a_RelY, a_RelZ); }
	inline NIBBLETYPE GetSkyLight  (int a_RelX, int a_RelY, int a_RelZ) const {return m_ChunkData.GetSkyLight(a_RelX, a_RelY, a_RelZ); }
	
	/** Same as GetBlock(), but relative coords needn't be in this chunk (uses m_Neighbor-s or m_ChunkMap in such a case); returns true on success */
	bool UnboundedRelGetBlock(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE & a_BlockType, NIBBLETYPE & a_BlockMeta) const;
	
	/** Same as GetBlockType(), but relative coords needn't be in this chunk (uses m_Neighbor-s or m_ChunkMap in such a case); returns true on success */
	bool UnboundedRelGetBlockType(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE & a_BlockType) const;
	
	/** Same as GetBlockMeta(), but relative coords needn't be in this chunk (uses m_Neighbor-s or m_ChunkMap in such a case); returns true on success */
	bool UnboundedRelGetBlockMeta(int a_RelX, int a_RelY, int a_RelZ, NIBBLETYPE & a_BlockMeta) const;
	
	/** Same as GetBlockBlockLight(), but relative coords needn't be in this chunk (uses m_Neighbor-s or m_ChunkMap in such a case); returns true on success */
	bool UnboundedRelGetBlockBlockLight(int a_RelX, int a_RelY, int a_RelZ, NIBBLETYPE & a_BlockLight) const;

	/** Same as GetBlockSkyLight(), but relative coords needn't be in this chunk (uses m_Neighbor-s or m_ChunkMap in such a case); returns true on success */
	bool UnboundedRelGetBlockSkyLight(int a_RelX, int a_RelY, int a_RelZ, NIBBLETYPE & a_SkyLight) const;

	/** Queries both BlockLight and SkyLight, relative coords needn't be in this chunk (uses m_Neighbor-s or m_ChunkMap in such a case); returns true on success */
	bool UnboundedRelGetBlockLights(int a_RelX, int a_RelY, int a_RelZ, NIBBLETYPE & a_BlockLight, NIBBLETYPE & a_SkyLight) const;

	/** Same as SetBlock(), but relative coords needn't be in this chunk (uses m_Neighbor-s or m_ChunkMap in such a case); returns true on success */
	bool UnboundedRelSetBlock(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta);

	/** Same as FastSetBlock(), but relative coords needn't be in this chunk (uses m_Neighbor-s or m_ChunkMap in such a case); returns true on success */
	bool UnboundedRelFastSetBlock(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta);
	
	/** Same as QueueTickBlock(), but relative coords needn't be in this chunk (uses m_Neighbor-s in such a case), ignores unsuccessful attempts */
	void UnboundedQueueTickBlock(int a_RelX, int a_RelY, int a_RelZ);

	/** Light alterations based on time */
	NIBBLETYPE GetTimeAlteredLight(NIBBLETYPE a_Skylight) const;


	// Per-chunk simulator data:
	cFireSimulatorChunkData & GetFireSimulatorData (void) { return m_FireSimulatorData; }
	cFluidSimulatorData *     GetWaterSimulatorData(void) { return m_WaterSimulatorData; }
	cFluidSimulatorData *     GetLavaSimulatorData (void) { return m_LavaSimulatorData; }
	cSandSimulatorChunkData & GetSandSimulatorData (void) { return m_SandSimulatorData; }

	cRedstoneSimulatorChunkData * GetRedstoneSimulatorData(void) { return &m_RedstoneSimulatorData; }
	cIncrementalRedstoneSimulator::PoweredBlocksList * GetRedstoneSimulatorPoweredBlocksList(void) { return &m_RedstoneSimulatorPoweredBlocksList; }
	cIncrementalRedstoneSimulator::LinkedBlocksList * GetRedstoneSimulatorLinkedBlocksList(void) { return &m_RedstoneSimulatorLinkedBlocksList; };
	cIncrementalRedstoneSimulator::SimulatedPlayerToggleableList * GetRedstoneSimulatorSimulatedPlayerToggleableList(void) { return &m_RedstoneSimulatorSimulatedPlayerToggleableList; };
	cIncrementalRedstoneSimulator::RepeatersDelayList * GetRedstoneSimulatorRepeatersDelayList(void) { return &m_RedstoneSimulatorRepeatersDelayList; };

	cBlockEntity * GetBlockEntity(int a_BlockX, int a_BlockY, int a_BlockZ);
	cBlockEntity * GetBlockEntity(const Vector3i & a_BlockPos) { return GetBlockEntity(a_BlockPos.x, a_BlockPos.y, a_BlockPos.z); }

private:

	friend class cChunkMap;
	
	struct sSetBlockQueueItem
	{
		Int64 m_Tick;
		int m_RelX, m_RelY, m_RelZ;
		BLOCKTYPE m_BlockType;
		NIBBLETYPE m_BlockMeta;
		BLOCKTYPE m_PreviousType;
		
		sSetBlockQueueItem(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, Int64 a_Tick, BLOCKTYPE a_PreviousBlockType) :
			m_Tick(a_Tick), m_RelX(a_RelX), m_RelY(a_RelY), m_RelZ(a_RelZ), m_BlockType(a_BlockType), m_BlockMeta(a_BlockMeta), m_PreviousType(a_PreviousBlockType)
		{
		}
	} ;

	typedef std::vector<sSetBlockQueueItem> sSetBlockQueueVector;
	

	bool m_IsValid;        // True if the chunk is loaded / generated
	bool m_IsLightValid;   // True if the blocklight and skylight are calculated
	bool m_IsDirty;        // True if the chunk has changed since it was last saved
	bool m_IsSaving;       // True if the chunk is being saved
	bool m_HasLoadFailed;  // True if chunk failed to load and hasn't been generated yet since then
	
	std::vector<Vector3i> m_ToTickBlocks;
	sSetBlockVector       m_PendingSendBlocks;  ///< Blocks that have changed and need to be sent to all clients
	
	sSetBlockQueueVector m_SetBlockQueue;  ///< Block changes that are queued to a specific tick
	
	// A critical section is not needed, because all chunk access is protected by its parent ChunkMap's csLayers
	cClientHandleList  m_LoadedByClient;
	cEntityList        m_Entities;
	cBlockEntityList   m_BlockEntities;
	
	/** Number of times the chunk has been requested to stay (by various cChunkStay objects); if zero, the chunk can be unloaded */
	int m_StayCount;

	int m_PosX, m_PosY, m_PosZ;
	cWorld *    m_World;
	cChunkMap * m_ChunkMap;

	cChunkData m_ChunkData;

	cChunkDef::HeightMap m_HeightMap;
	cChunkDef::BiomeMap  m_BiomeMap;

	int m_BlockTickX, m_BlockTickY, m_BlockTickZ;
	
	cChunk * m_NeighborXM;  // Neighbor at [X - 1, Z]
	cChunk * m_NeighborXP;  // Neighbor at [X + 1, Z]
	cChunk * m_NeighborZM;  // Neighbor at [X,     Z - 1]
	cChunk * m_NeighborZP;  // Neighbor at [X,     Z + 1]
	
	// Per-chunk simulator data:
	cFireSimulatorChunkData m_FireSimulatorData;
	cFluidSimulatorData *   m_WaterSimulatorData;
	cFluidSimulatorData *   m_LavaSimulatorData;
	cSandSimulatorChunkData m_SandSimulatorData;

	cRedstoneSimulatorChunkData m_RedstoneSimulatorData;
	cIncrementalRedstoneSimulator::PoweredBlocksList m_RedstoneSimulatorPoweredBlocksList;
	cIncrementalRedstoneSimulator::LinkedBlocksList m_RedstoneSimulatorLinkedBlocksList;
	cIncrementalRedstoneSimulator::SimulatedPlayerToggleableList m_RedstoneSimulatorSimulatedPlayerToggleableList;
	cIncrementalRedstoneSimulator::RepeatersDelayList m_RedstoneSimulatorRepeatersDelayList;


	// pick up a random block of this chunk
	void getRandomBlockCoords(int& a_X, int& a_Y, int& a_Z);
	void getThreeRandomNumber(int& a_X, int& a_Y, int& a_Z,int a_MaxX, int a_MaxY, int a_MaxZ);

	void RemoveBlockEntity(cBlockEntity * a_BlockEntity);
	void AddBlockEntity   (cBlockEntity * a_BlockEntity);

	/** Creates a block entity for each block that needs a block entity and doesn't have one in the list */
	void CreateBlockEntities(void);
	
	/** Wakes up each simulator for its specific blocks; through all the blocks in the chunk */
	void WakeUpSimulators(void);
	
	// Makes a copy of the list
	cClientHandleList GetAllClients(void) const {return m_LoadedByClient; }

	/** Sends m_PendingSendBlocks to all clients */
	void BroadcastPendingBlockChanges(void);
	
	/** Checks the block scheduled for checking in m_ToTickBlocks[] */
	void CheckBlocks();
	
	/** Ticks several random blocks in the chunk */
	void TickBlocks(void);
	
	/** Adds snow to the top of snowy biomes and hydrates farmland / fills cauldrons in rainy biomes */
	void ApplyWeatherToTop(void);
	
	/** Grows sugarcane by the specified number of blocks, but no more than 3 blocks high (used by both bonemeal and ticking) */
	void GrowSugarcane   (int a_RelX, int a_RelY, int a_RelZ, int a_NumBlocks);
	
	/** Grows cactus by the specified number of blocks, but no more than 3 blocks high (used by both bonemeal and ticking) */
	void GrowCactus      (int a_RelX, int a_RelY, int a_RelZ, int a_NumBlocks);

	/** Grows a melon or a pumpkin next to the block specified (assumed to be the stem) */
	void GrowMelonPumpkin(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockType, MTRand & a_Random);
	
	/** Called by Tick() when an entity moves out of this chunk into a neighbor; moves the entity and sends spawn / despawn packet to clients */
	void MoveEntityToNewChunk(cEntity * a_Entity);
	
	/** Processes all blocks that have been scheduled for replacement by the QueueSetBlock() function */
	void ProcessQueuedSetBlocks(void);
};

typedef cChunk * cChunkPtr;

typedef std::list<cChunkPtr> cChunkPtrList;