#include "stdafx.h"
#include "System.h"
#include "net.minecraft.world.entity.h"
#include "net.minecraft.world.level.h"
#include "net.minecraft.world.level.dimension.h"
#include "net.minecraft.world.level.tile.h"
#include "net.minecraft.world.phys.h"
#include "net.minecraft.world.level.biome.h"
#include "net.minecraft.world.entity.monster.h"
#include "DataLayer.h"
#include "SparseLightStorage.h"
#include "BlockReplacements.h"
#include "LevelChunk.h"
#include "..\Minecraft.Client\MinecraftServer.h"
#include "..\Minecraft.Client\ServerLevel.h"
#include "..\Minecraft.Client\ServerChunkCache.h"
#include "..\Minecraft.Client\GameRenderer.h"

#ifdef __PS3__
#include "C4JSpursJob.h"
#endif //__PS3__


#ifdef SHARING_ENABLED
CRITICAL_SECTION LevelChunk::m_csSharing;
#endif
#ifdef _ENTITIES_RW_SECTION
	// AP - use a RW critical section so we can have multiple threads reading the same data to avoid a clash
	CRITICAL_RW_SECTION LevelChunk::m_csEntities;
#else
	CRITICAL_SECTION LevelChunk::m_csEntities;
#endif
CRITICAL_SECTION LevelChunk::m_csTileEntities;
bool LevelChunk::touchedSky = false;

void LevelChunk::staticCtor()
{
#ifdef SHARING_ENABLED
	InitializeCriticalSection(&m_csSharing);
#endif
#ifdef _ENTITIES_RW_SECTION
	InitializeCriticalRWSection(&m_csEntities);
#else
	InitializeCriticalSection(&m_csEntities);
#endif
	InitializeCriticalSection(&m_csTileEntities);
}

void LevelChunk::init(Level *level, int x, int z)
{
	biomes = byteArray(16 * 16);
	for(int i = 0; i < 16 * 16; i++ )
	{
		biomes[i] = 0xff;	
	}
#ifdef _ENTITIES_RW_SECTION
	EnterCriticalRWSection(&m_csEntities, true);
#else
	EnterCriticalSection(&m_csEntities);
#endif
	entityBlocks = new vector<shared_ptr<Entity> > *[ENTITY_BLOCKS_LENGTH];
#ifdef _ENTITIES_RW_SECTION
	LeaveCriticalRWSection(&m_csEntities, true);
#else
	LeaveCriticalSection(&m_csEntities);
#endif

	terrainPopulated = 0;
	m_unsaved = false;
	lastSaveHadEntities = false;
	lastSaveTime = 0;
	dontSave = false;
	loaded = false;
	minHeight = 0;
	hasGapsToCheck = false;
	seenByPlayer = true; // 4J Stu - Always true

	// 4J Stu - Not using this
	checkLightPosition = 0; //LIGHT_CHECK_MAX_POS;

    this->level = level;
    this->x = x;
    this->z = z;
	MemSect(1);
    heightmap = byteArray(16 * 16);
#ifdef _ENTITIES_RW_SECTION
	EnterCriticalRWSection(&m_csEntities, true);
#else
	EnterCriticalSection(&m_csEntities);
#endif
	for (int i = 0; i < ENTITY_BLOCKS_LENGTH; i++)
	{
        entityBlocks[i] = new vector<shared_ptr<Entity> >();
    }
#ifdef _ENTITIES_RW_SECTION
	LeaveCriticalRWSection(&m_csEntities, true);
#else
	LeaveCriticalSection(&m_csEntities);
#endif

	MemSect(0);

	// Optimisation brought forward from 1.8.2, change from int to unsigned char & this special value changed from -999 to 255
	for(int i = 0; i < 16 * 16; i++ )
	{
		rainHeights[i] = 255;	
	}
	// 4J - lighting change brought forward from 1.8.2, introduced an array of bools called gapsToRecheck, which are now a single bit in array of nybble flags in this version
	for(int i = 0; i < 8 * 16; i++ )
	{
		columnFlags[i] = 0;		
	}

	// 4J added - to flag if any emissive tile has been added to this chunk (will be cleared when lighting has been successfully completed for this chunk). Defaulting to true
	// as emissive things can be made and passed in the the initialisation block array.
	emissiveAdded = true;

#ifdef _LARGE_WORLDS
	m_bUnloaded = false; // 4J Added
	m_unloadedEntitiesTag = NULL;
#endif
}

// This ctor is used for loading a save into
LevelChunk::LevelChunk(Level *level, int x, int z) : ENTITY_BLOCKS_LENGTH( Level::maxBuildHeight/16 )
{
    init(level, x, z);
	lowerBlocks = new CompressedTileStorage();
    lowerData = NULL;
    lowerSkyLight = NULL;
    lowerBlockLight = NULL;
	serverTerrainPopulated = NULL;

	if(Level::maxBuildHeight > Level::COMPRESSED_CHUNK_SECTION_HEIGHT)
	{
		// Create all these as empty, as we may not be loading any data into them
		upperBlocks = new CompressedTileStorage(true);
		upperData = new SparseDataStorage(true);
		upperSkyLight = new SparseLightStorage(true, true);
		upperBlockLight = new SparseLightStorage(false, true);
	}
	else
	{
		upperBlocks = NULL;
		upperData = NULL;
		upperSkyLight = NULL;
		upperBlockLight = NULL;
	}

#ifdef SHARING_ENABLED
	sharingTilesAndData = false;
#endif
}

// 4J - note that since we now compress the block storage, the parameter blocks is used as a source of data, but doesn't get used As the source data so needs
// to be deleted after calling this ctor.
LevelChunk::LevelChunk(Level *level, byteArray blocks, int x, int z) : ENTITY_BLOCKS_LENGTH( Level::maxBuildHeight/16 )
{
	init(level, x, z);

	// We'll be creating this as "empty" when this ctor is called on the client, as a result of a chunk becoming visible (but we don't have the data yet for it).
	// In this case, we want to keep memory usage down and so create all data as empty/compressed as possible. On the client we get the full data for the chunk as a single
	// update in a block region update packet, and so there is a single point where it is good to compress the data.
	bool createEmpty = ( blocks.data == NULL );

	if( createEmpty )
	{
		lowerBlocks = new CompressedTileStorage(true);
		lowerData = new SparseDataStorage(true);

		lowerSkyLight = new SparseLightStorage(true, true);
		lowerBlockLight = new SparseLightStorage(false, true);
	}
	else
	{
		lowerBlocks = new CompressedTileStorage(blocks,0);
		lowerData = new SparseDataStorage();

		// 4J - changed to new SpareLightStorage class for these
		lowerSkyLight = new SparseLightStorage(true);
		lowerBlockLight = new SparseLightStorage(false);
	}
//    skyLight = new DataLayer(blocks.length, level->depthBits);
//    blockLight = new DataLayer(blocks.length, level->depthBits);

	if(Level::maxBuildHeight > Level::COMPRESSED_CHUNK_SECTION_HEIGHT) 
	{
		if(blocks.length > Level::COMPRESSED_CHUNK_SECTION_TILES) upperBlocks = new CompressedTileStorage(blocks,Level::COMPRESSED_CHUNK_SECTION_TILES);
		else upperBlocks = new CompressedTileStorage(true);
		upperData = new SparseDataStorage(true);
		upperSkyLight = new SparseLightStorage(true, true);
		upperBlockLight = new SparseLightStorage(false, true);
	}
	else
	{
		upperBlocks = NULL;
		upperData = NULL;
		upperSkyLight = NULL;
		upperBlockLight = NULL;
	}

	serverTerrainPopulated = NULL;
#ifdef SHARING_ENABLED
	sharingTilesAndData = false;
#endif
}

// 4J - this ctor added to be able to make a levelchunk that shares its underlying block data between the server chunk cache & the multiplayer chunk cache.
// The original version this is shared from owns all the data that is shared into this copy, so it isn't deleted in the dtor.
LevelChunk::LevelChunk(Level *level, int x, int z, LevelChunk *lc) : ENTITY_BLOCKS_LENGTH( Level::maxBuildHeight/16 )
{
    init(level, x, z);

	// 4J Stu - Copy over the biome data
	memcpy(biomes.data,lc->biomes.data,biomes.length);

#ifdef SHARING_ENABLED
    lowerBlocks = lc->lowerBlocks;
    lowerData = lc->lowerData;
    lowerSkyLight = new SparseLightStorage( lc->lowerSkyLight );
    lowerBlockLight = new SparseLightStorage( lc->lowerBlockLight );
	upperBlocks = lc->upperBlocks;
	upperData = lc->upperData;
	upperSkyLight = new SparseLightStorage( lc->upperSkyLight );
	upperBlockLight = new SparseLightStorage( lc->upperBlockLight );

	sharingTilesAndData = true;
	serverTerrainPopulated = &lc->terrainPopulated;
#else
	this->blocks = new CompressedTileStorage(lc->blocks);
	this->data = new SparseDataStorage(lc->data);
	this->skyLight = new SparseLightStorage(lc->skyLight);
	this->blockLight = new SparseLightStorage(lc->blockLight);
	serverTerrainPopulated = NULL;
#endif
}

// 4J Added so we can track unsaved chunks better
void LevelChunk::setUnsaved(bool unsaved)
{
#ifdef _LARGE_WORLDS
	if(m_unsaved != unsaved)
	{
		if(unsaved) level->incrementUnsavedChunkCount();
		else level->decrementUnsavedChunkCount();
	}
#endif
	m_unsaved = unsaved;
}

void LevelChunk::stopSharingTilesAndData()
{
#ifdef SHARING_ENABLED
	EnterCriticalSection(&m_csSharing);
	lastUnsharedTime = System::currentTimeMillis();
	if( !sharingTilesAndData )
	{
		LeaveCriticalSection(&m_csSharing);
		return;
	}

	// If we've got a reference to a server chunk's terrainPopulated flag that this LevelChunk is sharing with, then don't consider unsharing
	// if it hasn't been set. This is because post-processing things that update the server chunks won't actually cause the server to send any updates
	// to the tiles that they alter, so they completely depend on the data not being shared for it to get from the server to here
	if( ( serverTerrainPopulated ) && ( ( (*serverTerrainPopulated) & sTerrainPopulatedAllAffecting ) != sTerrainPopulatedAllAffecting ) )
	{
		LeaveCriticalSection(&m_csSharing);
		return;
	}

	// If this is the empty chunk, then it will have a x & z of 0,0 - if we don't drop out here we'll end up unsharing the chunk at this location for no reason
	if( isEmpty() )
	{
		LeaveCriticalSection(&m_csSharing);
		return;
	}

	MemSect(47);

	// Changed to used compressed storage - these CTORs make deep copies of the storage passed as a parameter
	lowerBlocks = new CompressedTileStorage( lowerBlocks );

	// Changed to use new sparse data storage - this CTOR makes a deep copy of the storage passed as a parameter
	lowerData = new SparseDataStorage(lowerData);

	if(Level::maxBuildHeight > Level::COMPRESSED_CHUNK_SECTION_HEIGHT)
	{
		upperBlocks = new CompressedTileStorage( upperBlocks );
		upperData = new SparseDataStorage(upperData);
	}
	else
	{
		upperBlocks = NULL;
		upperData = NULL;
	}

	/*
	newDataLayer = new DataLayer(skyLight->data.length*2, level->depthBits);
	XMemCpy(newDataLayer->data.data, skyLight->data.data, skyLight->data.length);
	skyLight = newDataLayer;

	newDataLayer = new DataLayer(blockLight->data.length*2, level->depthBits);
	XMemCpy(newDataLayer->data.data, blockLight->data.data, blockLight->data.length);
	blockLight = newDataLayer;
	*/

	sharingTilesAndData = false;
	MemSect(0);
	LeaveCriticalSection(&m_csSharing);
#endif
}

// This is a slight variation on the normal start/stop sharing methods here as in general we aren't sharing lighting anymore. This method
// discards the client lighting information, and sets up new (non-shared) lighting to match the server. So generally like stop sharing,
// for the case where we're already not sharing
void LevelChunk::reSyncLighting()
{
#ifdef SHARING_ENABLED
	EnterCriticalSection(&m_csSharing);

	if( isEmpty() )
	{
		LeaveCriticalSection(&m_csSharing);
		return;
	}

#ifdef _LARGE_WORLDS
	LevelChunk *lc = MinecraftServer::getInstance()->getLevel( level->dimension->id )->cache->getChunkLoadedOrUnloaded(x,z);
#else
	LevelChunk *lc = MinecraftServer::getInstance()->getLevel( level->dimension->id )->cache->getChunk(x,z);
#endif

	GameRenderer::AddForDelete(lowerSkyLight);
	lowerSkyLight = new SparseLightStorage( lc->lowerSkyLight );
	GameRenderer::FinishedReassigning();
	GameRenderer::AddForDelete(lowerBlockLight);
	lowerBlockLight = new SparseLightStorage( lc->lowerBlockLight );
	GameRenderer::FinishedReassigning();

	if(Level::maxBuildHeight > Level::COMPRESSED_CHUNK_SECTION_HEIGHT)
	{
		GameRenderer::AddForDelete(upperSkyLight);
		upperSkyLight = new SparseLightStorage( lc->upperSkyLight );
		GameRenderer::FinishedReassigning();
		GameRenderer::AddForDelete(upperBlockLight);
		upperBlockLight = new SparseLightStorage( lc->upperBlockLight );
		GameRenderer::FinishedReassigning();
	}
	LeaveCriticalSection(&m_csSharing);
#endif
}

void LevelChunk::startSharingTilesAndData(int forceMs)
{
#ifdef SHARING_ENABLED
	EnterCriticalSection(&m_csSharing);
	if( sharingTilesAndData )
	{
		LeaveCriticalSection(&m_csSharing);
		return;
	}

	// If this is the empty chunk, then it will have a x & z of 0,0 - we'll end up potentially loading the 0,0 block if we proceed. And it obviously
	// doesn't make sense to go resharing the 0,0 block on behalf of an empty chunk either
	if( isEmpty() )
	{
		LeaveCriticalSection(&m_csSharing);
		return;
	}

#ifdef _LARGE_WORLDS
	LevelChunk *lc = MinecraftServer::getInstance()->getLevel( level->dimension->id )->cache->getChunkLoadedOrUnloaded(x,z);
#else
	LevelChunk *lc = MinecraftServer::getInstance()->getLevel( level->dimension->id )->cache->getChunk(x,z);
#endif

	// In normal usage, chunks should only reshare if their local data matched that on the server. The forceMs parameter though can
	// be used to force a share if resharing hasn't happened after a period of time
	if( forceMs == 0 )
	{
		// Normal behaviour - just check that the data matches, and don't start sharing data if it doesn't (yet)
		if( !lowerBlocks->isSameAs(lc->lowerBlocks) || (upperBlocks && lc->upperBlocks && !upperBlocks->isSameAs(lc->upperBlocks) ) )
		{
			LeaveCriticalSection(&m_csSharing);
			return;
		}
	}
	else
	{
		// Only force if it has been more than forceMs milliseconds since we last wanted to unshare this chunk
		__int64 timenow = System::currentTimeMillis();
		if( ( timenow - lastUnsharedTime ) < forceMs )
		{
			LeaveCriticalSection(&m_csSharing);
			return;
		}
	}

	// Note - data that was shared isn't directly deleted here, as it might still be in use in the game render update thread. Let that thread
	// delete it when it is safe to do so instead.
	GameRenderer::AddForDelete(lowerBlocks);
	lowerBlocks = lc->lowerBlocks;
	GameRenderer::FinishedReassigning();

	GameRenderer::AddForDelete(lowerData);
	lowerData = lc->lowerData;
	GameRenderer::FinishedReassigning();

	if(Level::maxBuildHeight > Level::COMPRESSED_CHUNK_SECTION_HEIGHT)
	{
		GameRenderer::AddForDelete(upperBlocks);
		upperBlocks = lc->upperBlocks;
		GameRenderer::FinishedReassigning();

		GameRenderer::AddForDelete(upperData);
		upperData = lc->upperData;
		GameRenderer::FinishedReassigning();
	}

	sharingTilesAndData = true;
	LeaveCriticalSection(&m_csSharing);
#endif
}

LevelChunk::~LevelChunk()
{
#ifdef SHARING_ENABLED
	if( !sharingTilesAndData )
#endif
	{
		delete lowerData;
		delete lowerBlocks;
		if(upperData) delete upperData;
		if(upperBlocks) delete upperBlocks;
	}

	delete lowerSkyLight;
	delete lowerBlockLight;
	if(upperSkyLight) delete upperSkyLight;
	if(upperBlockLight) delete upperBlockLight;

	delete[] heightmap.data;

	for(int i = 0; i < ENTITY_BLOCKS_LENGTH; ++i)
		delete entityBlocks[i];
	delete[] entityBlocks;

	delete[] biomes.data;

#ifdef _LARGE_WORLDS
	delete m_unloadedEntitiesTag;
#endif
}

bool LevelChunk::isAt(int x, int z)
{
    return x == this->x && z == this->z;
}

int LevelChunk::getHeightmap(int x, int z)
{
    return heightmap[z << 4 | x] & 0xff;
}

int LevelChunk::getHighestSectionPosition()
{
	return Level::maxBuildHeight - 16;
	// 4J Stu - Unused
	//for (int i = sections.length - 1; i >= 0; i--) {
	//	if (sections[i] != null) { // && !sections[i].isEmpty()) {
	//		return sections[i].getYPosition();
	//	}
	//}
	//return 0;
}

void LevelChunk::recalcBlockLights()
{
}



void LevelChunk::recalcHeightmapOnly()
{

	int min = Level::maxBuildHeight - 1;
	for (int x = 0; x < 16; x++)
		for (int z = 0; z < 16; z++)
		{
			rainHeights[x + (z << 4)] = 255; // 4J - changed from int to unsigned char & this special value changed from -999 to 255

			int y = Level::maxBuildHeight - 1;
			//            int p = x << level->depthBitsPlusFour | z << level->depthBits;		// 4J - removed
			CompressedTileStorage *blocks = (y-1) >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT?upperBlocks : lowerBlocks;
			while (y > 0 && Tile::lightBlock[blocks->get(x,(y - 1) % Level::COMPRESSED_CHUNK_SECTION_HEIGHT,z) & 0xff] == 0)		// 4J - was blocks->get() was blocks[p + y - 1]
			{
				y--;
				blocks = (y-1) >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT?upperBlocks : lowerBlocks;
			}
			heightmap[z << 4 | x] = (byte) y;
			if (y < min) min = y;
		}

		this->minHeight = min;
		this->setUnsaved(true);

}

void LevelChunk::recalcHeightmap()
{

    int min = Level::maxBuildHeight - 1;
    for (int x = 0; x < 16; x++)
        for (int z = 0; z < 16; z++)
		{
            int y = Level::maxBuildHeight - 1;
//            int p = x << level->depthBitsPlusFour | z << level->depthBits;			// 4J - removed
			
			CompressedTileStorage *blocks = (y-1) >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT?upperBlocks : lowerBlocks;
            while (y > 0 && Tile::lightBlock[blocks->get(x,(y-1) % Level::COMPRESSED_CHUNK_SECTION_HEIGHT,z) & 0xff] == 0)			// 4J - was blocks->get() was blocks[p + y - 1]
			{
                y--;
				blocks = (y-1) >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT?upperBlocks : lowerBlocks;
			}
            heightmap[z << 4 | x] = (byte) y;
            if (y < min) min = y;

            if (!level->dimension->hasCeiling)
			{
                int br = Level::MAX_BRIGHTNESS;
				int yy = Level::maxBuildHeight - 1;
				CompressedTileStorage *blocks = yy >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT?upperBlocks : lowerBlocks;
				SparseLightStorage *skyLight = yy >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT? upperSkyLight : lowerSkyLight;
                do
				{
                    br -= Tile::lightBlock[blocks->get(x,(yy % Level::COMPRESSED_CHUNK_SECTION_HEIGHT),z) & 0xff];					// 4J - blocks->get() was blocks[p + yy]
                    if (br > 0)
					{
                        skyLight->set(x, (yy % Level::COMPRESSED_CHUNK_SECTION_HEIGHT), z, br);
                    }
                    yy--;
					blocks = yy >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT?upperBlocks : lowerBlocks;
					skyLight = yy >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT? upperSkyLight : lowerSkyLight;
                } while (yy > 0 && br > 0);
            }
        }

    this->minHeight = min;

    for (int x = 0; x < 16; x++)
        for (int z = 0; z < 16; z++)
		{
            lightGaps(x, z);
        }

    this->setUnsaved(true);

}

// 4J - this code is fully commented out in the java version, but we have reimplemented something here to try and light
// lava as chunks are created, as otherwise they get shared before being lit, and then their lighting gets updated on the client
// and causes framerate stutters.
void LevelChunk::lightLava()
{
	if( !emissiveAdded ) return;
	
	for (int x = 0; x < 16; x++)
		for (int z = 0; z < 16; z++)
		{
//			int p = x << 11 | z << 7;			// 4J - removed
			int ymax = getHeightmap(x,z);
			for (int y = 0; y < Level::COMPRESSED_CHUNK_SECTION_HEIGHT; y++)
			{
				CompressedTileStorage *blocks = lowerBlocks;
				int emit = Tile::lightEmission[blocks->get(x,y,z)];	// 4J - blocks->get() was blocks[p + y]
				if( emit > 0 )
				{
//					printf("(%d,%d,%d)",this->x * 16 + x, y, this->z * 16 + z);
					// We'll be calling this function for a lot of chunks as they are post-processed. For every chunk that is
					// post-processed we're calling this for each of its neighbours in case some post-processing also created something
					// that needed lighting outside the starting chunk. Because of this, do a quick test on any emissive blocks that have
					// been added to see if checkLight has already been run on this particular block - this is straightforward to check
					// as being emissive blocks they'll have their block brightness set to their lightEmission level in this case.
					if( getBrightness(LightLayer::Block, x, y, z) < emit )
					{
						level->checkLight( LightLayer::Block, this->x * 16 + x, y, this->z * 16 + z, true);
					}
				}
			}
		}
	emissiveAdded = false;
}

void LevelChunk::lightGaps(int x, int z)
{
	// 4J - lighting change brought forward from 1.8.2, introduced an array of bools called gapsToRecheck, which are now a single bit in array of nybbles in this version
	int slot = ( x >> 1 ) | (z * 8);
	int shift = ( x & 1 ) * 4;
	columnFlags[slot] |= ( eColumnFlag_recheck << shift );
	hasGapsToCheck = true;
}
void LevelChunk::recheckGaps(bool bForce)
{
	// 4J added - otherwise we can end up doing a very broken kind of lighting since for an empty chunk, the heightmap is all zero, but it
	// still has an x and z of 0 which means that the level->getHeightmap references in here find a real chunk near the origin, and then attempt
	// to light massive gaps between the height of 0 and whatever heights are in those.
	if( isEmpty() ) return;		

	// 4J added
	int minXZ = - (level->dimension->getXZSize() * 16 ) / 2;
	int maxXZ = (level->dimension->getXZSize() * 16 ) / 2 - 1;

	// 4J - note - this test will currently return true for chunks at the edge of our world. Making further checks inside the loop now to address this issue.
    if (level->hasChunksAt(x * 16 + 8, Level::maxBuildHeight / 2, z * 16 + 8, 16))
	{
        for (int x = 0; x < 16; x++)
            for (int z = 0; z < 16; z++)
			{
				int slot = ( x >> 1 ) | (z * 8);
				int shift = ( x & 1 ) * 4;
                if (bForce || ( columnFlags[slot] & ( eColumnFlag_recheck << shift ) ) )
				{
                    columnFlags[slot] &= ~( eColumnFlag_recheck << shift );
                    int height = getHeightmap(x, z);
                    int xOffs = (this->x * 16) + x;
                    int zOffs = (this->z * 16) + z;

					// 4J - rewritten this to make sure that the minimum neighbour height which is calculated doesn't involve getting any heights from beyond the edge of the world,
					// which can lead to large, very expensive, non-existent cliff edges to be lit
					int nmin = level->getHeightmap(xOffs, zOffs);
					if( xOffs - 1 >= minXZ )
					{
						int n = level->getHeightmap(xOffs - 1, zOffs);
						if ( n < nmin ) nmin = n;
					}
					if( xOffs + 1 <= maxXZ )
					{
						int n = level->getHeightmap(xOffs + 1, zOffs);
						if ( n < nmin ) nmin = n;
					}
					if( zOffs - 1 >= minXZ )
					{
						int n = level->getHeightmap(xOffs, zOffs - 1);
						if ( n < nmin ) nmin = n;
					}
					if( zOffs + 1 <= maxXZ )
					{
						int n = level->getHeightmap(xOffs, zOffs + 1);
						if ( n < nmin ) nmin = n;
					}
                    lightGap(xOffs, zOffs, nmin);

					if( !bForce )	// 4J - if doing a full forced thing over every single column, we don't need to do these offset checks too
					{
						if( xOffs - 1 >= minXZ ) lightGap(xOffs - 1, zOffs, height);
						if( xOffs + 1 <= maxXZ ) lightGap(xOffs + 1, zOffs, height);
						if( zOffs - 1 >= minXZ ) lightGap(xOffs, zOffs - 1, height);
						if( zOffs + 1 <= maxXZ ) lightGap(xOffs, zOffs + 1, height);
					}
					hasGapsToCheck = false;
                }
            }
    }
}


void LevelChunk::lightGap(int x, int z, int source)
{
    int height = level->getHeightmap(x, z);

    if (height > source)
	{
        lightGap(x, z, source, height + 1);
    }
	else if (height < source) 
	{
        lightGap(x, z, height, source + 1);
    }
}

void LevelChunk::lightGap(int x, int z, int y1, int y2)
{
    if (y2 > y1)
	{
        if (level->hasChunksAt(x, Level::maxBuildHeight / 2, z, 16))
		{
            for (int y = y1; y < y2; y++)
			{
                level->checkLight(LightLayer::Sky, x, y, z);
            }
            this->setUnsaved(true);
        }
    }
}

void LevelChunk::recalcHeight(int x, int yStart, int z)
{
    int yOld = heightmap[z << 4 | x] & 0xff;
    int y = yOld;
    if (yStart > yOld) y = yStart;

//    int p = x << level->depthBitsPlusFour | z << level->depthBits;		// 4J - removed
	
	CompressedTileStorage *blocks = (y-1) >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT?upperBlocks : lowerBlocks;
	while (y > 0 && Tile::lightBlock[blocks->get(x,(y-1) % Level::COMPRESSED_CHUNK_SECTION_HEIGHT,z) & 0xff] == 0)		// 4J - blocks->get() was blocks[p + y - 1]
	{
        y--;
		blocks = (y-1) >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT?upperBlocks : lowerBlocks;
	}
    if (y == yOld) return;

//    level->lightColumnChanged(x, z, y, yOld);		// 4J - this call moved below & corrected - see comment further down
    heightmap[z << 4 | x] = (byte) y;

    if (y < minHeight)
	{
        minHeight = y;
    }
	else
	{
        int min = Level::maxBuildHeight - 1;
        for (int _x = 0; _x < 16; _x++)
            for (int _z = 0; _z < 16; _z++)
			{
                if ((heightmap[_z << 4 | _x] & 0xff) < min) min = (heightmap[_z << 4 | _x] & 0xff);
            }
        this->minHeight = min;
    }

    int xOffs = (this->x * 16) + x;
    int zOffs = (this->z * 16) + z;
	if (!level->dimension->hasCeiling)
	{
		if (y < yOld)
		{
			SparseLightStorage *skyLight = y >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT? upperSkyLight : lowerSkyLight;
			for (int yy = y; yy < yOld; yy++)
			{
				skyLight = yy >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT? upperSkyLight : lowerSkyLight;
				skyLight->set(x, (yy % Level::COMPRESSED_CHUNK_SECTION_HEIGHT), z, 15);
			}
		} else
		{
			// 4J - lighting change brought forward from 1.8.2
	//        level->updateLight(LightLayer::Sky, xOffs, yOld, zOffs, xOffs, y, zOffs);
			SparseLightStorage *skyLight = y >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT? upperSkyLight : lowerSkyLight;
			for (int yy = yOld; yy < y; yy++)
			{
				skyLight = yy >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT? upperSkyLight : lowerSkyLight;
				skyLight->set(x, (yy % Level::COMPRESSED_CHUNK_SECTION_HEIGHT), z, 0);
			}
		}

		int br = 15;
		
		SparseLightStorage *skyLight = y >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT? upperSkyLight : lowerSkyLight;
		while (y > 0 && br > 0)
		{
			y--;
			skyLight = y >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT? upperSkyLight : lowerSkyLight;
			int block = Tile::lightBlock[getTile(x, y, z)];
			if (block == 0) block = 1;
			br -= block;
			if (br < 0) br = 0;
			skyLight->set(x, (y % Level::COMPRESSED_CHUNK_SECTION_HEIGHT), z, br);
			// level.updateLightIfOtherThan(LightLayer.Sky, xOffs, y, zOffs,
	// -1);
		}
	}
	// 4J - changed to use xOffs and zOffs rather than the (incorrect) x and z it used to, and also moved so that it happens after all the lighting should be
	// done by this stage, as this will trigger our asynchronous render updates immediately (potentially) so don't want to say that the lighting is done & then do it
	level->lightColumnChanged(xOffs, zOffs, y, yOld);

	// 4J -  lighting changes brought forward from 1.8.2
    int height = heightmap[z << 4 | x];
    int y1 = yOld;
    int y2 = height;
    if (y2 < y1)
	{
        int tmp = y1;
        y1 = y2;
        y2 = tmp;
    }
	if (!level->dimension->hasCeiling)
	{
		PIXBeginNamedEvent(0,"Light gaps");
		lightGap(xOffs - 1, zOffs, y1, y2);
		lightGap(xOffs + 1, zOffs, y1, y2);
		lightGap(xOffs, zOffs - 1, y1, y2);
		lightGap(xOffs, zOffs + 1, y1, y2);
		lightGap(xOffs, zOffs, y1, y2);
		PIXEndNamedEvent();
	}

    this->setUnsaved(true);
}

/**
* The purpose of this method is to allow the EmptyLevelChunk to be all air
* but still block light. See EmptyLevelChunk.java
* 
* @param x
* @param y
* @param z
* @return
*/
int LevelChunk::getTileLightBlock(int x, int y, int z)
{
	return Tile::lightBlock[getTile(x, y, z)];
}

int LevelChunk::getTile(int x, int y, int z)
{
	CompressedTileStorage *blocks = y >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT ? upperBlocks : lowerBlocks;
	return blocks->get(x,y % Level::COMPRESSED_CHUNK_SECTION_HEIGHT,z);
}

bool LevelChunk::setTileAndData(int x, int y, int z, int _tile, int _data)
{
    byte tile = (byte) _tile;

	// Optimisation brought forward from 1.8.2, change from int to unsigned char & this special value changed from -999 to 255
    int slot = z << 4 | x;

    if (y >= ((int)rainHeights[slot]) - 1)
	{
        rainHeights[slot] = 255;
    }

    int oldHeight = heightmap[slot] & 0xff;
	
	CompressedTileStorage *blocks = y >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT ? upperBlocks : lowerBlocks;
	SparseDataStorage *data = y >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT ? upperData : lowerData;
	int old = blocks->get(x,y % Level::COMPRESSED_CHUNK_SECTION_HEIGHT,z);
	int oldData = data->get(x, y % Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z);
    if (old == _tile && oldData == _data) return false;
    int xOffs = this->x * 16 + x;
    int zOffs = this->z * 16 + z;
	if (old != 0 && !level->isClientSide)
	{
		Tile::tiles[old]->onRemoving(level, xOffs, y, zOffs, oldData);
	}
	PIXBeginNamedEvent(0,"Chunk setting tile");
	blocks->set(x,y % Level::COMPRESSED_CHUNK_SECTION_HEIGHT,z,tile);
	PIXEndNamedEvent();
    if (old != 0)
	{
        if (!level->isClientSide)
		{
			Tile::tiles[old]->onRemove(level, xOffs, y, zOffs, old, oldData);
		}
		else if (Tile::tiles[old]->isEntityTile() && old != _tile )
		{
			level->removeTileEntity(xOffs, y, zOffs);
		}
    }
	PIXBeginNamedEvent(0,"Chunk setting data");
	data->set(x, y % Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z, _data);
	PIXEndNamedEvent();

	// 4J added - flag if something emissive is being added. This is used during level creation to determine what chunks need extra lighting processing
	if( Tile::lightEmission[tile & 0xff] > 0 )
	{
		emissiveAdded = true;
	}

	PIXBeginNamedEvent(0,"Updating lighting");
	// 4J - There isn't any point in recalculating heights or updating sky lighting if this tile has
	// the same light-blocking capabilities as the one it is replacing
	if( Tile::lightBlock[tile & 0xff] != Tile::lightBlock[old & 0xff] )
	{
		if (!level->dimension->hasCeiling)
		{
			if (Tile::lightBlock[tile & 0xff] != 0)
			{
				if (y >= oldHeight)
				{
					PIXBeginNamedEvent(0,"Recalc height 1");
					recalcHeight(x, y + 1, z);
					PIXEndNamedEvent();
				}
			} else
			{
				if (y == oldHeight - 1)
				{
					PIXBeginNamedEvent(0,"Recalc height 2");
					recalcHeight(x, y, z);
					PIXEndNamedEvent();
				}
			}
		}

		// level.updateLight(LightLayer.Carried, xOffs, y, zOffs, xOffs, y,
	// zOffs);
		PIXBeginNamedEvent(0,"Lighting gaps");
		lightGaps(x, z);
		PIXEndNamedEvent();
	}
	PIXEndNamedEvent();
	data->set(x, y % Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z, _data);
    if (_tile != 0)
	{
		if (!level->isClientSide)
		{
			Tile::tiles[_tile]->onPlace(level, xOffs, y, zOffs);
		}
		else
		{
			// 4J - in general we don't want to run the onPlace method on the client, but do a specific bit of the fireTile onPlace code here,
			// otherwise we'll place fire on the client and if it isn't a suitable location then we have to wait a few frames before the server
			// updates us to say it wasn't right. In the meantime, the client will have done some local lighting etc. and we can end up
			// with errors when the update from the server comes in.
			if( _tile == Tile::fire_Id )
			{
				if(!Tile::tiles[_tile]->mayPlace(level, xOffs, y, zOffs ))
				{
					blocks->set(x,y % Level::COMPRESSED_CHUNK_SECTION_HEIGHT,z,0);
//					blocks[x << level->depthBitsPlusFour | z << level->depthBits | y] = 0;
				}
			}
		}
		// AP - changed the method of EntityTile detection cos it's well slow on Vita mate
//		if (_tile > 0 && dynamic_cast<EntityTile *>(Tile::tiles[_tile]) != NULL)
		if (_tile > 0 && Tile::tiles[_tile] != NULL && Tile::tiles[_tile]->isEntityTile())
		{
			shared_ptr<TileEntity> te = getTileEntity(x, y, z);
			if (te == NULL)
			{
				te = ((EntityTile *) Tile::tiles[_tile])->newTileEntity(level);
				//app.DebugPrintf("%s: Setting tile id %d, created tileEntity type %d\n", level->isClientSide?"Client":"Server", _tile, te->GetType());
				level->setTileEntity(xOffs, y, zOffs, te);
			}
			if (te != NULL)
			{
				//app.DebugPrintf("%s: Setting tile id %d, found tileEntity type %d\n", level->isClientSide?"Client":"Server", _tile, te->GetType());
				te->clearCache();
			}
		}
	}
	// AP - changed the method of EntityTile detection cos it's well slow on Vita mate
//	else if (old > 0 && dynamic_cast<EntityTile *>(Tile::tiles[old]) != NULL)
	else if (old > 0 && Tile::tiles[_tile] != NULL && Tile::tiles[_tile]->isEntityTile())
	{
		shared_ptr<TileEntity> te = getTileEntity(x, y, z);
		if (te != NULL)
		{
			te->clearCache();
		}
    }

    this->setUnsaved(true);
    return true;
}

bool LevelChunk::setTile(int x, int y, int z, int _tile)
{
	// 4J Stu - Now using setTileAndData (like in 1.5 Java) so there is only one place we have to fix things
	return setTileAndData(x,y,z,_tile,0);
}

int LevelChunk::getData(int x, int y, int z)
{
	SparseDataStorage *data = y >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT ? upperData : lowerData;
	return data->get(x, y % Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z);
}

bool LevelChunk::setData(int x, int y, int z, int val, int mask, bool *maskedBitsChanged)
{
	SparseDataStorage *data = y >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT ? upperData : lowerData;
    this->setUnsaved(true);
	int old = data->get(x, y % Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z);

	*maskedBitsChanged = ( ( old & mask ) != ( val & mask ) );

    if (old == val)
	{
        return false;
    }

    data->set(x, y % Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z, val);
	int _tile = getTile(x, y, z);
	if (_tile > 0 && dynamic_cast<EntityTile *>( Tile::tiles[_tile] ) != NULL)
	{
		shared_ptr<TileEntity> te = getTileEntity(x, y, z);
		if (te != NULL)
		{
			te->clearCache();
			te->data = val;
		}
	}
	return true;
}

int LevelChunk::getBrightness(LightLayer::variety layer, int x, int y, int z)
{
    if (layer == LightLayer::Sky)
	{
		SparseLightStorage *skyLight = y >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT ? upperSkyLight : lowerSkyLight;
		if(!skyLight) return 0;
		return skyLight->get(x, y % Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z);
	}
    else if (layer == LightLayer::Block)
	{
		SparseLightStorage *blockLight = y >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT ? upperBlockLight : lowerBlockLight;
		if(!blockLight) return 0;
		return blockLight->get(x, y % Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z);
	}
    else return 0;
}

// 4J added
void LevelChunk::getNeighbourBrightnesses(int *brightnesses, LightLayer::variety layer, int x, int y, int z)
{
	SparseLightStorage *light;
	if( layer == LightLayer::Sky ) light = y >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT ? upperSkyLight : lowerSkyLight;
	else light = y >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT ? upperBlockLight : lowerBlockLight;

	if(light)
	{
		brightnesses[0] = light->get(x - 1, y % Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z);
		brightnesses[1] = light->get(x + 1, y % Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z);
		brightnesses[4] = light->get(x, y % Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z - 1);
		brightnesses[5] = light->get(x, y % Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z + 1);
	}

	
	if( layer == LightLayer::Sky ) light = (y-1) >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT ? upperSkyLight : lowerSkyLight;
	else light = (y-1) >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT ? upperBlockLight : lowerBlockLight;
	if(light) brightnesses[2] = light->get(x, (y - 1) % Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z);

	
	if( layer == LightLayer::Sky ) light = (y+1) >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT ? upperSkyLight : lowerSkyLight;
	else light = (y+1) >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT ? upperBlockLight : lowerBlockLight;
	if(light) brightnesses[3] = light->get(x, (y + 1) % Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z);
}

void LevelChunk::setBrightness(LightLayer::variety layer, int x, int y, int z, int brightness)
{
    this->setUnsaved(true);
    if (layer == LightLayer::Sky)
	{
		if(!level->dimension->hasCeiling)
		{
			SparseLightStorage *skyLight = y >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT ? upperSkyLight : lowerSkyLight;
			skyLight->set(x, y % Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z, brightness);
		}
	}
    else if (layer == LightLayer::Block)
	{
		SparseLightStorage *blockLight = y >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT ? upperBlockLight : lowerBlockLight;
		blockLight->set(x, y % Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z, brightness);
	}
}

int LevelChunk::getRawBrightness(int x, int y, int z, int skyDampen)
{
	SparseLightStorage *skyLight = y >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT ? upperSkyLight : lowerSkyLight;
	int light = level->dimension->hasCeiling ? 0 : skyLight->get(x, y % Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z);
    if (light > 0) LevelChunk::touchedSky = true;
    light -= skyDampen;
	SparseLightStorage *blockLight = y >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT ? upperBlockLight : lowerBlockLight;
	int block = blockLight->get(x, y % Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z);
    if (block > light) light = block;

    /*
        * int xd = (absFloor(level.player.x-(this->x*16+x))); int yd =
        * (absFloor(level.player.y-(y))); int zd =
        * (absFloor(level.player.z-(this->z*16+z))); int dd = xd+yd+zd; if
        * (dd<15){ int carried = 15-dd; if (carried<0) carried = 0; if
        * (carried>15) carried = 15; if (carried > light) light = carried; }
        */

    return light;
}

void LevelChunk::addEntity(shared_ptr<Entity> e)
{
    lastSaveHadEntities = true;

    int xc = Mth::floor(e->x / 16);
    int zc = Mth::floor(e->z / 16);
    if (xc != this->x || zc != this->z)
	{
		app.DebugPrintf("Wrong location!");
//        System.out.println("Wrong location! " + e);
//        Thread.dumpStack();
    }
    int yc = Mth::floor(e->y / 16);
    if (yc < 0) yc = 0;
	if (yc >= ENTITY_BLOCKS_LENGTH) yc = ENTITY_BLOCKS_LENGTH - 1;
    e->inChunk = true;
    e->xChunk = x;
    e->yChunk = yc;
    e->zChunk = z;

#ifdef _ENTITIES_RW_SECTION
	EnterCriticalRWSection(&m_csEntities, true);
#else
	EnterCriticalSection(&m_csEntities);
#endif
	entityBlocks[yc]->push_back(e);
#ifdef _ENTITIES_RW_SECTION
	LeaveCriticalRWSection(&m_csEntities, true);
#else
	LeaveCriticalSection(&m_csEntities);
#endif
}


void LevelChunk::removeEntity(shared_ptr<Entity> e)
{
    removeEntity(e, e->yChunk);
}

void LevelChunk::removeEntity(shared_ptr<Entity> e, int yc)
{
    if (yc < 0) yc = 0;
    if (yc >= ENTITY_BLOCKS_LENGTH) yc = ENTITY_BLOCKS_LENGTH - 1;

#ifdef _ENTITIES_RW_SECTION
	EnterCriticalRWSection(&m_csEntities, true);
#else
	EnterCriticalSection(&m_csEntities);
#endif

	// 4J - was entityBlocks[yc]->remove(e);
	AUTO_VAR(it, find(entityBlocks[yc]->begin(),entityBlocks[yc]->end(),e));
	if( it != entityBlocks[yc]->end() )
	{
		entityBlocks[yc]->erase(it);
		// 4J - we don't want storage creeping up here as thinkgs move round the world accumulating up spare space
		MemSect(31);
#ifdef __PS3__
		// MGH - have to sort this C++11 code
		static bool bShowMsg = true;
		if(bShowMsg)
		{ 
			app.DebugPrintf("Need to add C++11 shrink_to_fit for PS3\n");
			bShowMsg = false;
		}
#else
		entityBlocks[yc]->shrink_to_fit();
#endif
		MemSect(0);
	}

#ifdef _ENTITIES_RW_SECTION
	LeaveCriticalRWSection(&m_csEntities, true);
#else
	LeaveCriticalSection(&m_csEntities);
#endif
}

bool LevelChunk::isSkyLit(int x, int y, int z)
{
    return y >= (heightmap[z << 4 | x] & 0xff);
}

void LevelChunk::skyBrightnessChanged()
{
    int x0 = this->x * 16;
    int y0 = this->minHeight - 16;
    int z0 = this->z * 16;
    int x1 = this->x * 16 + 16;
    int y1 = Level::maxBuildHeight - 1;
    int z1 = this->z * 16 + 16;

    level->setTilesDirty(x0, y0, z0, x1, y1, z1);
}

shared_ptr<TileEntity> LevelChunk::getTileEntity(int x, int y, int z)
{
    TilePos pos(x, y, z);

	// 4J Stu - Changed as we should not be using the [] accessor (causes an insert when we don't want one)
    //shared_ptr<TileEntity> tileEntity = tileEntities[pos];
	EnterCriticalSection(&m_csTileEntities);
	shared_ptr<TileEntity> tileEntity = nullptr;
	AUTO_VAR(it, tileEntities.find(pos));

	if (it == tileEntities.end())
	{
		LeaveCriticalSection(&m_csTileEntities);	// Note: don't assume iterator is valid for tileEntities after this point

		// Fix for #48450 - All: Code Defect: Hang: Game hangs in tutorial, when player arrive at the particular coordinate
		// 4J Stu - Chests try to get their neighbours when being destroyed,
		// which then causes new tile entities to be created if the neighbour has already been destroyed
		if(level->m_bDisableAddNewTileEntities) return nullptr;

        int t = getTile(x, y, z);
        if (t <= 0 || !Tile::tiles[t]->isEntityTile()) return nullptr;
		
		// 4J-PB changed from this in 1.7.3
		//EntityTile *et = (EntityTile *) Tile::tiles[t];
        //et->onPlace(level, this->x * 16 + x, y, this->z * 16 + z);

		//if (tileEntity == NULL)
		//{
			tileEntity = ((EntityTile *) Tile::tiles[t])->newTileEntity(level);
			level->setTileEntity(this->x * 16 + x, y, this->z * 16 + z, tileEntity);
		//}

        //tileEntity = tileEntities[pos];		// 4J - TODO - this doesn't seem right - assignment wrong way? Check

		// 4J Stu - It should have been inserted by now, but check to be sure
		EnterCriticalSection(&m_csTileEntities);
		AUTO_VAR(newIt, tileEntities.find(pos));
		if (newIt != tileEntities.end())
		{
			tileEntity = newIt->second;
		}
		LeaveCriticalSection(&m_csTileEntities);
    }
	else
	{
		tileEntity = it->second;
		LeaveCriticalSection(&m_csTileEntities);
	}
    if (tileEntity != NULL && tileEntity->isRemoved())
	{
		EnterCriticalSection(&m_csTileEntities);
        tileEntities.erase(pos);
		LeaveCriticalSection(&m_csTileEntities);
        return nullptr;
    }
	
    return tileEntity;
}

void LevelChunk::addTileEntity(shared_ptr<TileEntity> te)
{
    int xx = (int)(te->x - this->x * 16);
    int yy = (int)te->y;
    int zz = (int)(te->z - this->z * 16);
    setTileEntity(xx, yy, zz, te);
	if( loaded )
	{
		EnterCriticalSection(&level->m_tileEntityListCS);
		level->tileEntityList.push_back(te);
		LeaveCriticalSection(&level->m_tileEntityListCS);
	}
}

void LevelChunk::setTileEntity(int x, int y, int z, shared_ptr<TileEntity> tileEntity)
{
    TilePos pos(x, y, z);

    tileEntity->setLevel(level);
    tileEntity->x = this->x * 16 + x;
    tileEntity->y = y;
    tileEntity->z = this->z * 16 + z;

	if (getTile(x, y, z) == 0 || !Tile::tiles[getTile(x, y, z)]->isEntityTile())	// 4J - was !(Tile.tiles[getTile(x, y, z)] instanceof EntityTile))
	{
        app.DebugPrintf("Attempted to place a tile entity where there was no entity tile!\n");
        return;
    }

	tileEntity->clearRemoved();

	EnterCriticalSection(&m_csTileEntities);
    tileEntities[pos] = tileEntity;
	LeaveCriticalSection(&m_csTileEntities);
}

void LevelChunk::removeTileEntity(int x, int y, int z)
{
    TilePos pos(x, y, z);

	if (loaded)
	{
		// 4J - was:
		// TileEntity removeThis = tileEntities.remove(pos);
        //   if (removeThis != null) {
        //       removeThis.setRemoved();
        //   }
		EnterCriticalSection(&m_csTileEntities);
		AUTO_VAR(it, tileEntities.find(pos));
		if( it != tileEntities.end() )
		{
			shared_ptr<TileEntity> te = tileEntities[pos];
			tileEntities.erase(pos);
			if( te != NULL )
			{
				if(level->isClientSide)
				{
					app.DebugPrintf("Removing tile entity of type %d\n", te->GetType());
				}
				te->setRemoved();
			}
		}
		LeaveCriticalSection(&m_csTileEntities);
	}
}

void LevelChunk::load()
{
	loaded = true;

	if(!level->isClientSide)
	{
#ifdef _LARGE_WORLDS
		if(m_bUnloaded && m_unloadedEntitiesTag)
		{
			ListTag<CompoundTag> *entityTags = (ListTag<CompoundTag> *) m_unloadedEntitiesTag->getList(L"Entities");
			if (entityTags != NULL)
			{
				for (int i = 0; i < entityTags->size(); i++)
				{
					CompoundTag *teTag = entityTags->get(i);
					shared_ptr<Entity> te = EntityIO::loadStatic(teTag, level);
					if (te != NULL)
					{
						addEntity(te);
					}
				}
			}

			ListTag<CompoundTag> *tileEntityTags = (ListTag<CompoundTag> *) m_unloadedEntitiesTag->getList(L"TileEntities");
			if (tileEntityTags != NULL)
			{
				for (int i = 0; i < tileEntityTags->size(); i++)
				{
					CompoundTag *teTag = tileEntityTags->get(i);
					shared_ptr<TileEntity> te = TileEntity::loadStatic(teTag);
					if (te != NULL)
					{
						addTileEntity(te);
					}
				}
			}
			delete m_unloadedEntitiesTag;
			m_unloadedEntitiesTag = NULL;
			m_bUnloaded = false;
		}
#endif

		vector< shared_ptr<TileEntity> > values;
		EnterCriticalSection(&m_csTileEntities);
		for( AUTO_VAR(it, tileEntities.begin()); it != tileEntities.end(); it++ )
		{
			values.push_back(it->second);
		}
		LeaveCriticalSection(&m_csTileEntities);
		level->addAllPendingTileEntities(values);

#ifdef _ENTITIES_RW_SECTION
		EnterCriticalRWSection(&m_csEntities, true);
#else
		EnterCriticalSection(&m_csEntities);
#endif
		for (int i = 0; i < ENTITY_BLOCKS_LENGTH; i++)
		{
			level->addEntities(entityBlocks[i]);
		}
#ifdef _ENTITIES_RW_SECTION
		LeaveCriticalRWSection(&m_csEntities, true);
#else
		LeaveCriticalSection(&m_csEntities);
#endif
	}
	else
	{
#ifdef _LARGE_WORLDS
		m_bUnloaded = false;
#endif
	}
}

void LevelChunk::unload(bool unloadTileEntities)	// 4J - added parameter
{
    loaded = false;
	if( unloadTileEntities )
	{
		EnterCriticalSection(&m_csTileEntities);
		for( AUTO_VAR(it, tileEntities.begin()); it != tileEntities.end(); it++ )
		{
		// 4J-PB -m 1.7.3 was it->second->setRemoved();
			level->markForRemoval(it->second);
		}
		LeaveCriticalSection(&m_csTileEntities);
	}

#ifdef _ENTITIES_RW_SECTION
	EnterCriticalRWSection(&m_csEntities, true);
#else
	EnterCriticalSection(&m_csEntities);
#endif
	for (int i = 0; i < ENTITY_BLOCKS_LENGTH; i++)
	{
		level->removeEntities(entityBlocks[i]);
	}
#ifdef _ENTITIES_RW_SECTION
	LeaveCriticalRWSection(&m_csEntities, true);
#else
	LeaveCriticalSection(&m_csEntities);
#endif
	//app.DebugPrintf("Unloaded chunk %d, %d\n", x, z);

#ifdef _LARGE_WORLDS
	if ( !m_bUnloaded ) // 4J-JEV: If we unload a chunk twice, we delete all the entities/tile-entities its saved in the entitiesTag.
	{
		m_bUnloaded = true;
		if(!level->isClientSide)
		{
			delete m_unloadedEntitiesTag;
			// 4J Stu - Save out entities to a cached format that won't interfere with other systems
			m_unloadedEntitiesTag = new CompoundTag();
			PIXBeginNamedEvent(0,"Saving entities");
			ListTag<CompoundTag> *entityTags = new ListTag<CompoundTag>();

		EnterCriticalSection(&m_csEntities);
			for (int i = 0; i < ENTITY_BLOCKS_LENGTH; i++)
			{
				AUTO_VAR(itEnd, entityBlocks[i]->end());
				for( vector<shared_ptr<Entity> >::iterator it = entityBlocks[i]->begin(); it != itEnd; it++ )
		{
					shared_ptr<Entity> e = *it;
					CompoundTag *teTag = new CompoundTag();
					if (e->save(teTag))
					{
						entityTags->add(teTag);
					}

				}

				// Clear out this list
				entityBlocks[i]->clear();
			}
		LeaveCriticalSection(&m_csEntities);

			m_unloadedEntitiesTag->put(L"Entities", entityTags);
			PIXEndNamedEvent();

			PIXBeginNamedEvent(0,"Saving tile entities");
			ListTag<CompoundTag> *tileEntityTags = new ListTag<CompoundTag>();

			AUTO_VAR(itEnd,tileEntities.end());
			for( unordered_map<TilePos, shared_ptr<TileEntity>, TilePosKeyHash, TilePosKeyEq>::iterator it = tileEntities.begin();
				it != itEnd; it++)
			{
				shared_ptr<TileEntity> te = it->second;
				CompoundTag *teTag = new CompoundTag();
				te->save(teTag);
				tileEntityTags->add(teTag);
			}
			// Clear out the tileEntities list
			tileEntities.clear();

			m_unloadedEntitiesTag->put(L"TileEntities", tileEntityTags);
			PIXEndNamedEvent();
		}
	}
#endif
}

#ifdef _LARGE_WORLDS
bool LevelChunk::isUnloaded()
{
	return m_bUnloaded;
}
#endif

void LevelChunk::markUnsaved()
{
    this->setUnsaved(true);
}


void LevelChunk::getEntities(shared_ptr<Entity> except, AABB *bb, vector<shared_ptr<Entity> > &es)
{
    int yc0 = Mth::floor((bb->y0 - 2) / 16);
    int yc1 = Mth::floor((bb->y1 + 2) / 16);
    if (yc0 < 0) yc0 = 0;
    if (yc1 >= ENTITY_BLOCKS_LENGTH) yc1 = ENTITY_BLOCKS_LENGTH - 1;

	// AP - RW critical sections are expensive so enter once in Level::getEntities
	EnterCriticalSection(&m_csEntities);
    for (int yc = yc0; yc <= yc1; yc++)
	{
        vector<shared_ptr<Entity> > *entities = entityBlocks[yc];

		AUTO_VAR(itEnd, entities->end());
		for (AUTO_VAR(it, entities->begin()); it != itEnd; it++)
		{
            shared_ptr<Entity> e = *it; //entities->at(i);
            if (e != except && e->bb->intersects(bb))
			{
				es.push_back(e);
                vector<shared_ptr<Entity> > *subs = e->getSubEntities();
                if (subs != NULL)
				{
                    for (int j = 0; j < subs->size(); j++)
					{
                        e = subs->at(j);
                        if (e != except && e->bb->intersects(bb))
						{
                            es.push_back(e);
                        }
                    }
                }
			}
        }
    }
	LeaveCriticalSection(&m_csEntities);
}

void LevelChunk::getEntitiesOfClass(const type_info& ec, AABB *bb, vector<shared_ptr<Entity> > &es)
{
    int yc0 = Mth::floor((bb->y0 - 2) / 16);
    int yc1 = Mth::floor((bb->y1 + 2) / 16);

    if (yc0 < 0)
	{
        yc0 = 0;
    }
	else if (yc0 >= ENTITY_BLOCKS_LENGTH)
	{
        yc0 = ENTITY_BLOCKS_LENGTH - 1;
    }
    if (yc1 >= ENTITY_BLOCKS_LENGTH)
	{
        yc1 = ENTITY_BLOCKS_LENGTH - 1;
    }
	else if (yc1 < 0)
	{
        yc1 = 0;
    }

	// AP - RW critical sections are expensive so enter once in Level::getEntitiesOfClass
	EnterCriticalSection(&m_csEntities);
    for (int yc = yc0; yc <= yc1; yc++)
	{
        vector<shared_ptr<Entity> > *entities = entityBlocks[yc];
		
		AUTO_VAR(itEnd, entities->end());
		for (AUTO_VAR(it, entities->begin()); it != itEnd; it++)
		{
            shared_ptr<Entity> e = *it; //entities->at(i);

			bool isAssignableFrom = false;
			// Some special cases where the base class is a general type that our class may be derived from, otherwise do a direct comparison of type_info
			if( ec == typeid(Player) ) { if( dynamic_pointer_cast<Player>(e) != NULL )  isAssignableFrom = true; }
			else if ( ec == typeid(Mob) )  { if( dynamic_pointer_cast<Mob>(e) != NULL )  isAssignableFrom = true; }
			else if ( ec == typeid(Monster) )  { if( dynamic_pointer_cast<Monster>(e) != NULL )  isAssignableFrom = true; }
			else if ( ec == typeid(Zombie) )  { if( dynamic_pointer_cast<Zombie>(e) != NULL )  isAssignableFrom = true; }
			else if(e != NULL && ec == typeid(*(e.get())) ) isAssignableFrom = true;
            if (isAssignableFrom && e->bb->intersects(bb)) es.push_back(e);
			// 4J - note needs to be equivalent to baseClass.isAssignableFrom(e.getClass())
        }
    }
	LeaveCriticalSection(&m_csEntities);
}

int LevelChunk::countEntities()
{
    int entityCount = 0;
#ifdef _ENTITIES_RW_SECTION
	EnterCriticalRWSection(&m_csEntities, false);
#else
	EnterCriticalSection(&m_csEntities);
#endif
    for (int yc = 0; yc < ENTITY_BLOCKS_LENGTH; yc++)
	{
        entityCount += (int)entityBlocks[yc]->size();
    }
#ifdef _ENTITIES_RW_SECTION
	LeaveCriticalRWSection(&m_csEntities, false);
#else
	LeaveCriticalSection(&m_csEntities);
#endif
	return entityCount;
}

bool LevelChunk::shouldSave(bool force)
{
    if (dontSave) return false;
    if (force)
	{
        if (lastSaveHadEntities && level->getTime() != lastSaveTime) return true;
    } else {
        if (lastSaveHadEntities && level->getTime() >= lastSaveTime + 20 * 30) return true;
    }

    return m_unsaved;
}

int LevelChunk::getBlocksAndData(byteArray *data, int x0, int y0, int z0, int x1, int y1, int z1, int p, bool includeLighting/* = true*/)
{
    int xs = x1 - x0;
    int ys = y1 - y0;
    int zs = z1 - z0;

	// 4J Stu - Added this because some "min" functions don't let us use our constants :(
	int compressedHeight = Level::COMPRESSED_CHUNK_SECTION_HEIGHT;

	// 4J - replaced block storage as now using CompressedTileStorage
	if(y0 < Level::COMPRESSED_CHUNK_SECTION_HEIGHT) p += lowerBlocks->getDataRegion( *data, x0, y0, z0, x1, min(compressedHeight, y1), z1, p );
	if(y1 > Level::COMPRESSED_CHUNK_SECTION_HEIGHT) p += upperBlocks->getDataRegion( *data, x0, max(y0-compressedHeight,0), z0, x1, y1-Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z1, p );

	// 4J - replaced data storage as now using SparseDataStorage
	if(y0 < Level::COMPRESSED_CHUNK_SECTION_HEIGHT) p += lowerData->getDataRegion( *data, x0, y0, z0, x1, min(compressedHeight, y1), z1, p );
	if(y1 > Level::COMPRESSED_CHUNK_SECTION_HEIGHT) p += upperData->getDataRegion( *data, x0, max(y0-compressedHeight,0), z0, x1, y1-Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z1, p );

	if( includeLighting )
	{
		// 4J - replaced block and skylight storage as these now use our SparseLightStorage
		if(y0 < Level::COMPRESSED_CHUNK_SECTION_HEIGHT) p += lowerBlockLight->getDataRegion( *data, x0, y0, z0, x1, min(compressedHeight, y1), z1, p );
		if(y1 > Level::COMPRESSED_CHUNK_SECTION_HEIGHT) p += upperBlockLight->getDataRegion( *data, x0, max(y0-compressedHeight,0), z0, x1, y1-Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z1, p );

		if(y0 < Level::COMPRESSED_CHUNK_SECTION_HEIGHT) p += lowerSkyLight->getDataRegion( *data, x0, y0, z0, x1, min(compressedHeight, y1), z1, p );
		if(y1 > Level::COMPRESSED_CHUNK_SECTION_HEIGHT) p += upperSkyLight->getDataRegion( *data, x0, max(y0-compressedHeight,0), z0, x1, y1-Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z1, p );
	}

	/*
    for (int x = x0; x < x1; x++)
        for (int z = z0; z < z1; z++)
		{
            int slot = (x << level->depthBitsPlusFour | z << level->depthBits | y0) >> 1;
            int len = (y1 - y0) / 2;
            System::arraycopy(blockLight->data, slot, data, p, len);
            p += len;
        }

    for (int x = x0; x < x1; x++)
        for (int z = z0; z < z1; z++)
		{
            int slot = (x << level->depthBitsPlusFour | z << level->depthBits | y0) >> 1;
            int len = (y1 - y0) / 2;
            System::arraycopy(skyLight->data, slot, data, p, len);
            p += len;
        }
		*/

    return p;
}

// 4J added - return true if setBlocksAndData would change any blocks
bool LevelChunk::testSetBlocksAndData(byteArray data, int x0, int y0, int z0, int x1, int y1, int z1, int p)
{
	bool changed = false;

	// 4J Stu - Added this because some "min" functions don't let us use our constants :(
	int compressedHeight = Level::COMPRESSED_CHUNK_SECTION_HEIGHT;

	if(y0 < Level::COMPRESSED_CHUNK_SECTION_HEIGHT) changed = lowerBlocks->testSetDataRegion(data, x0, y0, z0, x1, min(compressedHeight, y1), z1, p);
	if(y1 > Level::COMPRESSED_CHUNK_SECTION_HEIGHT) changed = changed || upperBlocks->testSetDataRegion(data, x0, max(y0-compressedHeight,0), z0, x1, y1-Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z1, p);

	return changed;
}

void LevelChunk::tileUpdatedCallback(int x, int y, int z, void *param, int yparam)
{
	LevelChunk *lc = (LevelChunk *)param;
	int xx = lc->x * 16 + x;
	int yy = y + yparam;
	int zz = lc->z * 16 + z;
	lc->level->checkLight(xx, yy, zz);
}

int LevelChunk::setBlocksAndData(byteArray data, int x0, int y0, int z0, int x1, int y1, int z1, int p, bool includeLighting/* = true*/)
{
	// If includeLighting is set, then this is a full chunk's worth of data that we are receiving on the client. We'll have made this chunk initially as compressed,
	// so throw that data away and make some fully uncompressed storage now to improve the speed up writing to it. Only doing this for lower chunks as quite likely
	// that the upper chunk doesn't have anything in anyway.
	if( includeLighting )
	{
		GameRenderer::AddForDelete(lowerBlocks);
		byteArray emptyByteArray;
		lowerBlocks = new CompressedTileStorage(emptyByteArray,0);
		GameRenderer::FinishedReassigning();

		GameRenderer::AddForDelete(lowerSkyLight);
		lowerSkyLight = new SparseLightStorage(true,false);
		GameRenderer::FinishedReassigning();

		GameRenderer::AddForDelete(lowerBlockLight);
		lowerBlockLight = new SparseLightStorage(false,false);
		GameRenderer::FinishedReassigning();

		GameRenderer::AddForDelete(lowerData);
		lowerData = new SparseDataStorage(false);
		GameRenderer::FinishedReassigning();
	}

	// 4J Stu - Added this because some "min" functions don't let us use our constants :(
	int compressedHeight = Level::COMPRESSED_CHUNK_SECTION_HEIGHT;

	// 4J - replaced block storage as now uses CompressedTileStorage
	if(y0 < Level::COMPRESSED_CHUNK_SECTION_HEIGHT) p += lowerBlocks->setDataRegion( data, x0, y0, z0, x1, min(compressedHeight, y1), z1, p, includeLighting ? NULL : tileUpdatedCallback, this, 0 );
	if(y1 > Level::COMPRESSED_CHUNK_SECTION_HEIGHT) p += upperBlocks->setDataRegion( data, x0, max(y0-compressedHeight,0), z0, x1, y1-Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z1, p, includeLighting ? NULL : tileUpdatedCallback, this, Level::COMPRESSED_CHUNK_SECTION_HEIGHT );
	/*
    for (int x = x0; x < x1; x++)
        for (int z = z0; z < z1; z++)
		{
            int slot = x << level->depthBitsPlusFour | z << level->depthBits | y0;
            int len = y1 - y0;
            System::arraycopy(data, p, &blocks, slot, len);
            p += len;
        }*/

    recalcHeightmapOnly();

	// 4J - replaced data storage as now uses SparseDataStorage
	if(y0 < Level::COMPRESSED_CHUNK_SECTION_HEIGHT) p += lowerData->setDataRegion( data, x0, y0, z0, x1, min(compressedHeight, y1), z1, p, includeLighting ? NULL : tileUpdatedCallback, this, 0 );
	if(y1 > Level::COMPRESSED_CHUNK_SECTION_HEIGHT) p += upperData->setDataRegion( data, x0, max(y0-compressedHeight,0), z0, x1, y1-Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z1, p, includeLighting ? NULL : tileUpdatedCallback, this, Level::COMPRESSED_CHUNK_SECTION_HEIGHT );

	if( includeLighting )
	{
		// 4J - replaced block and skylight storage as these now use our SparseLightStorage
		if(y0 < Level::COMPRESSED_CHUNK_SECTION_HEIGHT) p += lowerBlockLight->setDataRegion( data, x0, y0, z0, x1, min(compressedHeight, y1), z1, p );
		if(y1 > Level::COMPRESSED_CHUNK_SECTION_HEIGHT) p += upperBlockLight->setDataRegion( data, x0, max(y0-compressedHeight,0), z0, x1, y1-Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z1, p );

		if(y0 < Level::COMPRESSED_CHUNK_SECTION_HEIGHT) p += lowerSkyLight->setDataRegion( data, x0, y0, z0, x1, min(compressedHeight, y1), z1, p );
		if(y1 > Level::COMPRESSED_CHUNK_SECTION_HEIGHT) p += upperSkyLight->setDataRegion( data, x0, max(y0-compressedHeight,0), z0, x1, y1-Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z1, p );

		memcpy(biomes.data, &data.data[p],biomes.length);
		p += biomes.length;
	}
	else
	{
		// Because the host's local client shares data with it, the lighting updates that are done via callbacks in the setDataRegion calls above when things don't work, as they
		// don't detect changes because they've already happened just because the data was being shared when the server updated them. This will leave the lighting information out of sync on
		// the client, so resync for this & surrounding chunks that might have been affected
		if( level->isClientSide && g_NetworkManager.IsHost() )
		{
			reSyncLighting();
			level->getChunk(x-1,z-1)->reSyncLighting();
			level->getChunk(x-0,z-1)->reSyncLighting();
			level->getChunk(x+1,z-1)->reSyncLighting();
			level->getChunk(x-1,z+0)->reSyncLighting();
			level->getChunk(x+1,z+0)->reSyncLighting();
			level->getChunk(x-1,z+1)->reSyncLighting();
			level->getChunk(x+0,z+1)->reSyncLighting();
			level->getChunk(x+1,z+1)->reSyncLighting();
		}
	}

	/*
    for (int x = x0; x < x1; x++)
        for (int z = z0; z < z1; z++)
		{
            int slot = (x << level->depthBitsPlusFour | z << level->depthBits | y0) >> 1;
            int len = (y1 - y0) / 2;
            System::arraycopy(data, p, &blockLight->data, slot, len);
            p += len;
        }

    for (int x = x0; x < x1; x++)
        for (int z = z0; z < z1; z++)
		{
            int slot = (x << level->depthBitsPlusFour | z << level->depthBits | y0) >> 1;
            int len = (y1 - y0) / 2;
            System::arraycopy(data, p, &skyLight->data, slot, len);
            p += len;
        }
		*/

	for(AUTO_VAR(it, tileEntities.begin()); it != tileEntities.end(); ++it)
	{
		it->second->clearCache();
	}
//        recalcHeightmap();

	// If the includeLighting flag is set, then this is a full chunk's worth of data. This is a good time to compress everything that we've just set up.
	if( includeLighting )
	{
		compressLighting();
		compressBlocks();
		compressData();
	}

    return p;
}

void LevelChunk::setCheckAllLight()
{
	checkLightPosition = 0;
}

Random *LevelChunk::getRandom(__int64 l)
{
    return new Random((level->getSeed() + x * x * 4987142 + x * 5947611 + z * z * 4392871l + z * 389711) ^ l);
}

bool LevelChunk::isEmpty()
{
    return false;
}
void LevelChunk::attemptCompression()
{
	// 4J - removed
#if 0
    try {
        ByteArrayOutputStream *baos = new ByteArrayOutputStream();
        GZIPOutputStream *gzos = new GZIPOutputStream(baos);
        DataOutputStream *dos = new DataOutputStream(gzos);
        dos.close();
        System.out.println("Compressed size: " + baos.toByteArray().length);
    } catch (Exception e) {

    }
#endif
}

void LevelChunk::checkPostProcess(ChunkSource *source, ChunkSource *parent, int x, int z)
{
	if ( ( ( terrainPopulated & sTerrainPopulatedFromHere ) == 0 ) && source->hasChunk(x + 1, z + 1) && source->hasChunk(x, z + 1) && source->hasChunk(x + 1, z))
	{
		source->postProcess(parent, x, z);
	}
	if (source->hasChunk(x - 1, z) && ( (source->getChunk(x - 1, z)->terrainPopulated & sTerrainPopulatedFromHere ) == 0 ) && source->hasChunk(x - 1, z + 1) && source->hasChunk(x, z + 1) && source->hasChunk(x - 1, z + 1))
	{
		source->postProcess(parent, x - 1, z);
	}
	if (source->hasChunk(x, z - 1) && ( (source->getChunk(x, z - 1)->terrainPopulated & sTerrainPopulatedFromHere ) == 0 ) && source->hasChunk(x + 1, z - 1) && source->hasChunk(x + 1, z))
	{
		source->postProcess(parent, x, z - 1);
	}
	if (source->hasChunk(x - 1, z - 1) && ( (source->getChunk(x - 1, z - 1)->terrainPopulated & sTerrainPopulatedFromHere ) == 0 ) && source->hasChunk(x, z - 1) && source->hasChunk(x - 1, z))
	{
		source->postProcess(parent, x - 1, z - 1);
	}
}

// 4J added - check for any pre-1.8.2 chests in the chunk at (x,z), and calculate their facing direction & relight to bring up to date with the post 1.8.2 build
void LevelChunk::checkChests(ChunkSource *source, int x, int z )
{
	LevelChunk *lc = source->getChunk( x, z );

	for( int xx = 0; xx < 16; xx++ )
		for( int zz = 0; zz < 16; zz++ )
			for( int yy = 0; yy < 128; yy++ )
			{
				if( lc->getTile( xx, yy, zz ) == Tile::chest_Id )
				{
					if( lc->getData( xx, yy, zz ) == 0 )
					{
						int xOffs = x * 16 + xx;
						int zOffs = z * 16 + zz;
						ChestTile *tile = (ChestTile *)Tile::tiles[Tile::chest_Id];
						tile->recalcLockDir( level, xOffs, yy, zOffs );
						level->checkLight(xOffs, yy, zOffs, true);
					}
				}
			}
}

// 4J - lighting change brought forward from 1.8.2
void LevelChunk::tick()
{
	if (hasGapsToCheck && !level->dimension->hasCeiling) recheckGaps();
}

ChunkPos *LevelChunk::getPos()
{
    return new ChunkPos(x, z);
}

bool LevelChunk::isYSpaceEmpty(int y1, int y2)
{
	return false;
	// 4J Unused
	/*if (y1 < 0) {
		y1 = 0;
	}
	if (y2 >= Level.maxBuildHeight) {
		y2 = Level.maxBuildHeight - 1;
	}
	for (int y = y1; y <= y2; y += 16) {
		LevelChunkSection section = sections[y >> 4];
		if (section != null && !section.isEmpty()) {
			return false;
		}
	}
	return true;*/
}

Biome *LevelChunk::getBiome(int x, int z, BiomeSource *biomeSource)
{
	int value = biomes[(z << 4) | x] & 0xff;
	if (value == 0xff)
	{
		Biome *biome = biomeSource->getBiome((this->x << 4) + x, (this->z << 4) + z);
		value = biome->id;
		biomes[(z << 4) | x] = (byte) (value & 0xff);
	}
	if (Biome::biomes[value] == NULL)
	{
		return Biome::plains;
	}
	return Biome::biomes[value];
}

byteArray LevelChunk::getBiomes()
{
	return biomes;
}

void LevelChunk::setBiomes(byteArray biomes)
{
	if(this->biomes.data != NULL) delete[] this->biomes.data;
	this->biomes = biomes;
}

// 4J - optimisation brought forward from 1.8.2
int LevelChunk::getTopRainBlock(int x, int z)
{
    int slot = x | (z << 4);
    int h = rainHeights[slot];

    if (h == 255)
	{
        int y = Level::maxBuildHeight - 1;
        h = -1;
        while (y > 0 && h == -1)
		{
            int t = getTile(x, y, z);
            Material *m = t == 0 ? Material::air : Tile::tiles[t]->material;
            if (!m->blocksMotion() && !m->isLiquid())
			{
                y--;
            }
			else
			{
                h = y + 1;
            }
        }
		// 255 indicates that the rain height needs recalculated. If the rain height ever actually Does get to 255, then it will just keep not being cached, so
		// probably better just to let the rain height be 254 in this instance and suffer a slightly incorrect results
		if( h == 255 ) h = 254;
		rainHeights[slot] = h;
    }

    return h;
}

// 4J added as optimisation, these biome checks are expensive so caching through flags in levelchunk
bool LevelChunk::biomeHasRain(int x, int z)
{
	updateBiomeFlags(x, z);
	int slot = ( x >> 1 ) | (z * 8);
	int shift = ( x & 1 ) * 4;
	return ( ( columnFlags[slot] & ( eColumnFlag_biomeHasRain << shift ) ) != 0 );
}

// 4J added as optimisation, these biome checks are expensive so caching through flags in levelchunk
bool LevelChunk::biomeHasSnow(int x, int z)
{
	updateBiomeFlags(x, z);
	int slot = ( x >> 1 ) | (z * 8);
	int shift = ( x & 1 ) * 4;
	return ( ( columnFlags[slot] & ( eColumnFlag_biomeHasSnow << shift ) ) != 0 );
}

void LevelChunk::updateBiomeFlags(int x, int z)
{
	int slot = ( x >> 1 ) | (z * 8);
	int shift = ( x & 1 ) * 4;
	if( ( columnFlags[slot] & ( eColumnFlag_biomeOk << shift ) ) == 0 )
	{
		int xOffs = (this->x * 16) + x;
		int zOffs = (this->z * 16) + z;
		BiomeArray biomes;
		level->getBiomeSource()->getBiomeBlock(biomes, xOffs, zOffs, 1, 1, true);
		if( biomes[0]->hasRain()) columnFlags[slot] |= ( eColumnFlag_biomeHasRain << shift );
		if( biomes[0]->hasSnow()) columnFlags[slot] |= ( eColumnFlag_biomeHasSnow << shift );
		columnFlags[slot] |= ( eColumnFlag_biomeOk << shift );
		delete biomes.data;
	}
}

// Get a byte array of length 16384 ( 128 x 16 x 16 x 0.5 ), containing data. Ordering same as java version if originalOrder set;
void LevelChunk::getDataData(byteArray data)
{
	lowerData->getData(data,0);
	if(data.length > Level::COMPRESSED_CHUNK_SECTION_TILES/2) upperData->getData(data,Level::COMPRESSED_CHUNK_SECTION_TILES/2);
}

// Set data to data passed in input byte array of length 16384. This data must be in original (java version) order if originalOrder set.
void LevelChunk::setDataData(byteArray data)
{
	if( lowerData == NULL ) lowerData = new SparseDataStorage();
	if( upperData == NULL ) upperData = new SparseDataStorage(true);
	lowerData->setData(data,0);
	if(data.length > Level::COMPRESSED_CHUNK_SECTION_TILES/2) upperData->setData(data,Level::COMPRESSED_CHUNK_SECTION_TILES/2);
}

// Get a byte array of length 16384 ( 128 x 16 x 16 x 0.5 ), containing sky light data. Ordering same as java version if originalOrder set;
void LevelChunk::getSkyLightData(byteArray data)
{
	lowerSkyLight->getData(data,0);
	if(data.length > Level::COMPRESSED_CHUNK_SECTION_TILES/2) upperSkyLight->getData(data,Level::COMPRESSED_CHUNK_SECTION_TILES/2);
}

// Get a byte array of length 16384 ( 128 x 16 x 16 x 0.5 ), containing block light data. Ordering same as java version if originalOrder set;
void LevelChunk::getBlockLightData(byteArray data)
{
	lowerBlockLight->getData(data,0);
	if(data.length > Level::COMPRESSED_CHUNK_SECTION_TILES/2) upperBlockLight->getData(data,Level::COMPRESSED_CHUNK_SECTION_TILES/2);
}

// Set sky light data to data passed in input byte array of length 16384. This data must be in original (java version) order if originalOrder set.
void LevelChunk::setSkyLightData(byteArray data)
{
	if( lowerSkyLight == NULL ) lowerSkyLight = new SparseLightStorage(true);
	if( upperSkyLight == NULL ) upperSkyLight = new SparseLightStorage(true,true);
	lowerSkyLight->setData(data,0);
	if(data.length > Level::COMPRESSED_CHUNK_SECTION_TILES/2) upperSkyLight->setData(data,Level::COMPRESSED_CHUNK_SECTION_TILES/2);
}

// Set block light data to data passed in input byte array of length 16384. This data must be in original (java version) order if originalOrder set.
void LevelChunk::setBlockLightData(byteArray data)
{
	if( lowerBlockLight == NULL ) lowerBlockLight = new SparseLightStorage(false);
	if( upperBlockLight == NULL ) upperBlockLight = new SparseLightStorage(false, true);
	lowerBlockLight->setData(data,0);
	if(data.length > Level::COMPRESSED_CHUNK_SECTION_TILES/2) upperBlockLight->setData(data,Level::COMPRESSED_CHUNK_SECTION_TILES/2);
}

// Set sky light data to be all fully lit
void LevelChunk::setSkyLightDataAllBright()
{
	lowerSkyLight->setAllBright();
	upperSkyLight->setAllBright();
}

// Attempt to compress lighting data. Doesn't make any guarantee that it will succeed - can only compress if the lighting data is being shared, and nothing else is trying to update it from another thread.
void LevelChunk::compressLighting()
{
	// The lighting data is now generally not shared between host & local client, but is for a while at the start of level creation (until the point where the chunk data would be transferred by network
	// data for remote clients). We'll therefore either be compressing a shared copy here or one of the server or client copies depending on 
	lowerSkyLight->compress();
	upperSkyLight->compress();
	lowerBlockLight->compress();
	upperBlockLight->compress();
}

void LevelChunk::compressBlocks()
{
#ifdef SHARING_ENABLED
	CompressedTileStorage *blocksToCompressLower = NULL;
	CompressedTileStorage *blocksToCompressUpper = NULL;

	// If we're the host machine, and this is the client level, then we only want to do this if we are sharing data. This means that we will be compressing the data that is shared from the server.
	// No point trying to compress the local client copy of the data if the data is unshared, since we'll be throwing this data away again anyway once we share with the server again.
	if( level->isClientSide && g_NetworkManager.IsHost() )
	{
		// Note - only the extraction of the pointers needs to be done in the critical section, since even if the data is unshared whilst we are processing this data is still valid (for the server)
		EnterCriticalSection(&m_csSharing);
		if( sharingTilesAndData )
		{
			blocksToCompressLower = lowerBlocks;
			blocksToCompressUpper = upperBlocks;
		}
		LeaveCriticalSection(&m_csSharing);
	}
	else
	{
		// Not the host, simple case
		blocksToCompressLower = lowerBlocks;
		blocksToCompressUpper = upperBlocks;
	}

	// Attempt to do the actual compression
	if( blocksToCompressLower ) blocksToCompressLower->compress();
	if( blocksToCompressUpper ) blocksToCompressUpper->compress();
#else
	blocks->compress();
#endif
}

bool LevelChunk::isLowerBlockStorageCompressed()
{
	return lowerBlocks->isCompressed();
}

int LevelChunk::isLowerBlockLightStorageCompressed()
{
	return lowerBlockLight->isCompressed();
}

int LevelChunk::isLowerDataStorageCompressed()
{
	return lowerData->isCompressed();
}

void LevelChunk::writeCompressedBlockData(DataOutputStream *dos)
{
	lowerBlocks->write(dos);
	upperBlocks->write(dos);
}

void LevelChunk::writeCompressedDataData(DataOutputStream *dos)
{
	lowerData->write(dos);
	upperData->write(dos);
}

void LevelChunk::writeCompressedSkyLightData(DataOutputStream *dos)
{
	lowerSkyLight->write(dos);
	upperSkyLight->write(dos);
}

void LevelChunk::writeCompressedBlockLightData(DataOutputStream *dos)
{
	lowerBlockLight->write(dos);
	upperBlockLight->write(dos);
}

void LevelChunk::readCompressedBlockData(DataInputStream *dis)
{
	lowerBlocks->read(dis);
	upperBlocks->read(dis);
}

void LevelChunk::readCompressedDataData(DataInputStream *dis)
{
	if( lowerData == NULL ) lowerData = new SparseDataStorage();
	if( upperData == NULL ) upperData = new SparseDataStorage(true);
	lowerData->read(dis);
	upperData->read(dis);
}

void LevelChunk::readCompressedSkyLightData(DataInputStream *dis)
{
	if( lowerSkyLight == NULL ) lowerSkyLight = new SparseLightStorage(true);
	if( upperSkyLight == NULL ) upperSkyLight = new SparseLightStorage(true,true);
	lowerSkyLight->read(dis);
	upperSkyLight->read(dis);
}

void LevelChunk::readCompressedBlockLightData(DataInputStream *dis)
{
	if( lowerBlockLight == NULL ) lowerBlockLight = new SparseLightStorage(false);
	if( upperBlockLight == NULL ) upperBlockLight = new SparseLightStorage(false, true);
	lowerBlockLight->read(dis);
	upperBlockLight->read(dis);
}

// Attempt to compress data. Doesn't make any guarantee that it will succeed - can only compress if the data is being shared, and nothing else is trying to update it from another thread.
void LevelChunk::compressData()
{
#ifdef SHARING_ENABLED
	SparseDataStorage *dataToCompressLower = NULL;
	SparseDataStorage *dataToCompressUpper = NULL;

	// If we're the host machine, and this is the client level, then we only want to do this if we are sharing data. This means that we will be compressing the data that is shared from the server.
	// No point trying to compress the local client copy of the data if the data is unshared, since we'll be throwing this data away again anyway once we share with the server again.
	if( level->isClientSide && g_NetworkManager.IsHost() )
	{
		// Note - only the extraction of the pointers needs to be done in the critical section, since even if the data is unshared whilst we are processing this data is still valid (for the server)
		EnterCriticalSection(&m_csSharing);
		if( sharingTilesAndData )
		{
			dataToCompressLower = lowerData;
			dataToCompressUpper = upperData;
		}
		LeaveCriticalSection(&m_csSharing);
	}
	else
	{
		// Not the host, simple case
		dataToCompressLower = lowerData;
		dataToCompressUpper = upperData;
	}

	// Attempt to do the actual compression
	if( dataToCompressLower ) dataToCompressLower->compress();
	if( dataToCompressUpper ) dataToCompressUpper->compress();
#else
	data->compress();
#endif
}

bool LevelChunk::isRenderChunkEmpty(int y)
{
	if( isEmpty() )
	{
		return true;
	}
	if( y >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT )
	{
		return upperBlocks->isRenderChunkEmpty( y -  Level::COMPRESSED_CHUNK_SECTION_HEIGHT );
	}
	else
	{
		return lowerBlocks->isRenderChunkEmpty( y );
	}
}

// Set block data to that passed in in the input array of size 32768
void LevelChunk::setBlockData(byteArray data)
{
	lowerBlocks->setData(data,0);
	if(data.length > Level::COMPRESSED_CHUNK_SECTION_TILES) upperBlocks->setData(data,Level::COMPRESSED_CHUNK_SECTION_TILES);
}

// Sets data in passed in array of size 32768, from the block data in this chunk
void LevelChunk::getBlockData(byteArray data)
{
	lowerBlocks->getData(data,0);
	if(data.length > Level::COMPRESSED_CHUNK_SECTION_TILES) upperBlocks->getData(data,Level::COMPRESSED_CHUNK_SECTION_TILES);
}

int LevelChunk::getBlocksAllocatedSize(int *count0, int *count1, int *count2, int *count4, int *count8)
{
	return lowerBlocks->getAllocatedSize(count0, count1, count2, count4, count8);
}

int LevelChunk::getHighestNonEmptyY()
{
	int highestNonEmptyY = -1;
	if(upperBlocks) highestNonEmptyY = upperBlocks->getHighestNonEmptyY() + Level::COMPRESSED_CHUNK_SECTION_HEIGHT;
	if(highestNonEmptyY < 0) highestNonEmptyY = lowerBlocks->getHighestNonEmptyY();
	if(highestNonEmptyY < 0) highestNonEmptyY = 0;

	return highestNonEmptyY;
}

byteArray LevelChunk::getReorderedBlocksAndData(int x0, int y0, int z0, int xs, int &ys, int zs)
{
	int highestNonEmpty = getHighestNonEmptyY();

	ys = min(highestNonEmpty - y0, ys);
	if(ys < 0 ) ys = 0;

	int x1 = x0 + xs;
	int y1 = y0 + ys;
	int z1 = z0 + zs;

	unsigned int tileCount = xs * ys * zs;
	unsigned int halfTileCount = tileCount/2;

	byteArray data = byteArray( tileCount + (3* halfTileCount) + biomes.length );
	for( int x = 0; x < xs; x++ )
	{
		for( int z = 0; z < zs; z++ )
		{
			for( int y = 0; y < ys; y++ )
			{
				int slot = (y*xs*zs) + (z*xs) + x;

				data[slot] = getTile(x,y,z);
			}
		}
	}

	int p = tileCount;

	// 4J Stu - Added this because some "min" functions don't let us use our constants :(
	int compressedHeight = Level::COMPRESSED_CHUNK_SECTION_HEIGHT;

	// 4J - replaced data storage as now using SparseDataStorage
	if(y0 < Level::COMPRESSED_CHUNK_SECTION_HEIGHT) p += lowerData->getDataRegion( data, x0, y0, z0, x1, min(compressedHeight, y1), z1, p );
	if(y1 > Level::COMPRESSED_CHUNK_SECTION_HEIGHT) p += upperData->getDataRegion( data, x0, max(y0-compressedHeight,0), z0, x1, y1-Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z1, p );

	// 4J - replaced block and skylight storage as these now use our SparseLightStorage
	if(y0 < Level::COMPRESSED_CHUNK_SECTION_HEIGHT) p += lowerBlockLight->getDataRegion( data, x0, y0, z0, x1, min(compressedHeight, y1), z1, p );
	if(y1 > Level::COMPRESSED_CHUNK_SECTION_HEIGHT) p += upperBlockLight->getDataRegion( data, x0, max(y0-compressedHeight,0), z0, x1, y1-Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z1, p );

	if(y0 < Level::COMPRESSED_CHUNK_SECTION_HEIGHT) p += lowerSkyLight->getDataRegion( data, x0, y0, z0, x1, min(compressedHeight, y1), z1, p );
	if(y1 > Level::COMPRESSED_CHUNK_SECTION_HEIGHT) p += upperSkyLight->getDataRegion( data, x0, max(y0-compressedHeight,0), z0, x1, y1-Level::COMPRESSED_CHUNK_SECTION_HEIGHT, z1, p );

	memcpy(&data.data[p],biomes.data,biomes.length);

	return data;

	//byteArray rawBuffer = byteArray( Level::CHUNK_TILE_COUNT + (3* Level::HALF_CHUNK_TILE_COUNT) );
	//for( int x = 0; x < 16; x++ )
	//{
	//	for( int z = 0; z < 16; z++ )
	//	{
	//		for( int y = 0; y < Level::maxBuildHeight; y++ )
	//		{
	//			int slot = y << 8 | z << 4 | x;

	//			rawBuffer[slot] = lc->getTile(x,y,z);
	//		}
	//	}
	//}
	//
	//unsigned int offset = Level::CHUNK_TILE_COUNT;
	//// Don't bother reordering block data, block light or sky light as they don't seem to make much difference
	//byteArray dataData = byteArray(rawBuffer.data+offset, Level::HALF_CHUNK_TILE_COUNT);
	//lc->getDataData(dataData);
	//offset += Level::HALF_CHUNK_TILE_COUNT;
	//byteArray blockLightData = byteArray(rawBuffer.data + offset, Level::HALF_CHUNK_TILE_COUNT);
	//offset += Level::HALF_CHUNK_TILE_COUNT;
	//byteArray skyLightData = byteArray(rawBuffer.data + offset, Level::HALF_CHUNK_TILE_COUNT);
	//lc->getBlockLightData(blockLightData);
	//lc->getSkyLightData(skyLightData);
	//return rawBuffer;
}

void LevelChunk::reorderBlocksAndDataToXZY(int y0, int xs, int ys, int zs, byteArray *data)
{
	int y1 = y0 + ys;
	unsigned int tileCount = xs * ys * zs;
	unsigned int halfTileCount = tileCount/2;
	
	int sectionHeight = Level::COMPRESSED_CHUNK_SECTION_HEIGHT;
	int lowerYSpan = min(y1, sectionHeight) - y0;
	int upperYSpan = ys - lowerYSpan;
	int upperSlotOffset = xs * zs * lowerYSpan;

	int biomesLength = 16 * 16;
	byteArray newBuffer = byteArray(tileCount + (3* halfTileCount) + biomesLength);
	for( int x = 0; x < xs; x++ )
	{
		for( int z = 0; z < zs; z++ )
		{
			for( int y = 0; y < ys; y++ )
			{
				int slotY = y;
				unsigned int targetSlotOffset = 0;
				int ySpan = lowerYSpan;
				if(y >= Level::COMPRESSED_CHUNK_SECTION_HEIGHT)
				{
					slotY -= Level::COMPRESSED_CHUNK_SECTION_HEIGHT;
					targetSlotOffset = upperSlotOffset;
					ySpan = upperYSpan;
				}
				int slot = (x*zs*ySpan) + (z*ySpan) + slotY;
				int slot2 = (y*xs*zs) + (z*xs) + x;

				newBuffer[slot + targetSlotOffset] = data->data[slot2];
			}
		}
	}
	// Copy over block data, block light, skylight and biomes as-is
	memcpy(newBuffer.data + tileCount, data->data + tileCount, 3*halfTileCount + biomesLength);
	delete [] data->data;
	data->data = newBuffer.data;

	//int p = 0;
	//setBlocksAndData(*data, x0, y0, z0, x1, y1, z1, p);

	//// If it is a full chunk, we'll need to rearrange into the order the rest of the game expects
	//if( xs == 16 && ys == 128 && zs == 16 && ( ( x & 15 ) == 0 ) && ( y == 0 ) && ( ( z & 15 ) == 0 ) ) 
	//{
	//	byteArray newBuffer = byteArray(81920);
	//	for( int x = 0; x < 16; x++ )
	//	{
	//		for( int z = 0; z < 16; z++ )
	//		{
	//			for( int y = 0; y < 128; y++ )
	//			{
	//				int slot = x << 11 | z << 7 | y;
	//				int slot2 = y << 8 | z << 4 | x;

	//				newBuffer[slot] = buffer[slot2];
	//			}
	//		}
	//	}
	//	// Copy over block data, block light & skylight as-is
	//	memcpy(newBuffer.data + 32768, buffer.data + 32768, 49152);
	//	delete buffer.data;
	//	buffer.data = newBuffer.data;
	//}
}