neoLegacy/Minecraft.World/PistonBaseTile.cpp

#include "stdafx.h"
#include "PistonBaseTile.h"
#include "PistonMovingPiece.h"
#include "PistonPieceEntity.h"
#include "PistonExtensionTile.h"
#include "Facing.h"
#include "net.minecraft.world.level.h"
#include "../Minecraft.Client/Minecraft.h"
#include "../Minecraft.Client/MultiPlayerLevel.h"
#include "net.minecraft.world.h"
#include "LevelChunk.h"
#include "Dimension.h"
#include <algorithm>
#include <deque>
#include <climits>
#if defined(_WINDOWS64) && defined(MINECRAFT_SERVER_BUILD)
#include "../Minecraft.Server/FourKitBridge.h"
#endif

const wstring PistonBaseTile::EDGE_TEX = L"piston_side";
const wstring PistonBaseTile::PLATFORM_TEX = L"piston_top";
const wstring PistonBaseTile::PLATFORM_STICKY_TEX = L"piston_top_sticky";
const wstring PistonBaseTile::BACK_TEX = L"piston_bottom";
const wstring PistonBaseTile::INSIDE_TEX = L"piston_inner_top";

const float PistonBaseTile::PLATFORM_THICKNESS = 4.0f;

DWORD PistonBaseTile::tlsIdx = TlsAlloc();

// 4J - NOTE - this ignoreUpdate stuff has been removed from the java version, but I'm not currently sure how the java version does without it... there must be
// some other mechanism that we don't have that stops the event from one piston being processed, from causing neighbours to have extra events created for them.
// For us, that means that if we create a piston next to another one, then one of them gets two events to createPush, the second of which fails, leaving the
// piston in a bad (simultaneously extended & not extended) state.
// 4J - ignoreUpdate is a static in java, implementing as TLS here to make thread safe

//I removed the code for ignoreUpdate so the above comment no longer applies ^.^

PistonBaseTile::PistonBaseTile(int id, bool isSticky) : Tile(id, Material::piston, isSolidRender() )
{
	this->isSticky = isSticky;
	setSoundType(SOUND_STONE);
	setDestroyTime(0.5f);

	iconInside = nullptr;
	iconBack = nullptr;
	iconPlatform = nullptr;
}

void PistonBaseTile::createBlockStateDefinition()
{
	if (!m_blockStateDefinition)
		m_blockStateDefinition = new BlockStateDefinition(this);
}

int PistonBaseTile::defaultBlockState()
{
	return 0;
}

int PistonBaseTile::convertBlockStateToLegacyData(BlockState *state)
{
	return state ? (state->value & 0xF) : 0;
}

Tile::BlockState PistonBaseTile::getBlockState(int data)
{
	return Tile::BlockState(data & 0xF);
}

Tile::BlockState PistonBaseTile::getBlockState(LevelSource *level, int x, int y, int z)
{
	return Tile::BlockState(level->getData(x, y, z) & 0xF);
}

Icon *PistonBaseTile::getPlatformTexture()
{
	return iconPlatform;
}

void PistonBaseTile::updateShape(float x0, float y0, float z0, float x1, float y1, float z1)
{
	setShape(x0, y0, z0, x1, y1, z1);
}

Icon *PistonBaseTile::getTexture(int face, int data)
{
	int facing = getFacing(data);

	if (facing > 5)
	{
		return iconPlatform;
	}

	if (face == facing)
	{
		// sorry about this mess...
		// when the piston is extended, either normally
		// or because a piston arm animation, the top
		// texture is the furnace bottom
		ThreadStorage *tls = static_cast<ThreadStorage *>(TlsGetValue(Tile::tlsIdxShape));
		if (isExtended(data) || tls->xx0 > 0 || tls->yy0 > 0 || tls->zz0 > 0 || tls->xx1 < 1 || tls->yy1 < 1 || tls->zz1 < 1)
		{
			return iconInside;
		}
		return iconPlatform;
	}
	if (face == Facing::OPPOSITE_FACING[facing])
	{
		return iconBack;
	}

	return icon;
}

Icon *PistonBaseTile::getTexture(const wstring &name)
{
	if (name.compare(EDGE_TEX) == 0) return Tile::pistonBase->icon;
	if (name.compare(PLATFORM_TEX) == 0) return Tile::pistonBase->iconPlatform;
	if (name.compare(PLATFORM_STICKY_TEX) == 0) return Tile::sticky_piston->iconPlatform;
	if (name.compare(INSIDE_TEX) == 0) return Tile::pistonBase->iconInside;

	return nullptr;
}

//@Override
void PistonBaseTile::registerIcons(IconRegister *iconRegister)
{
	icon = iconRegister->registerIcon(EDGE_TEX);
	iconPlatform = iconRegister->registerIcon(isSticky ? PLATFORM_STICKY_TEX : PLATFORM_TEX);
	iconInside = iconRegister->registerIcon(INSIDE_TEX);
	iconBack = iconRegister->registerIcon(BACK_TEX);
}

int PistonBaseTile::getRenderShape()
{
	return SHAPE_PISTON_BASE;
}

bool PistonBaseTile::isSolidRender(bool isServerLevel)
{
	return false;
}

bool PistonBaseTile::use(Level *level, int x, int y, int z, shared_ptr<Player> player, int clickedFace, float clickX, float clickY, float clickZ, bool soundOnly/*=false*/) // 4J added soundOnly param
{
	return false;
}

void PistonBaseTile::setPlacedBy(Level *level, int x, int y, int z, shared_ptr<LivingEntity> by, shared_ptr<ItemInstance> itemInstance)
{
	int targetData = getNewFacing(level, x, y, z, dynamic_pointer_cast<Player>(by) );
	level->setData(x, y, z, targetData, Tile::UPDATE_CLIENTS);
	if (!level->isClientSide)
	{
		checkIfExtend(level, x, y, z);
	}
}

void PistonBaseTile::neighborChanged(Level *level, int x, int y, int z, int type)
{
	if (!level->isClientSide)
	{
		checkIfExtend(level, x, y, z);
	}
}

void PistonBaseTile::onPlace(Level *level, int x, int y, int z)
{
	if (!level->isClientSide && level->getTileEntity(x, y, z) == nullptr)
	{
		checkIfExtend(level, x, y, z);
	}
}

void PistonBaseTile::checkIfExtend(Level *level, int x, int y, int z)
{
	int data = level->getData(x, y, z);
	int facing = getFacing(data);

	if (facing == UNDEFINED_FACING)
	{
		return;
	}
	bool extend = getNeighborSignal(level, x, y, z, facing);

	if (extend && !isExtended(data))
	{
		if (canPush(level, x, y, z, facing))
		{
			level->tileEvent(x, y, z, id, TRIGGER_EXTEND, facing);
		}
	}
	else if (!extend && isExtended(data))
	{
		// level->setData(x, y, z, facing, UPDATE_CLIENTS);
		level->tileEvent(x, y, z, id, TRIGGER_CONTRACT, facing);
	}
}

/**
* This method checks neighbor signals for this block and the block above,
* and directly beneath. However, it avoids checking blocks that would be
* pushed by this block.
* 
* @param level
* @param x
* @param y
* @param z
* @return
*/
bool PistonBaseTile::getNeighborSignal(Level *level, int x, int y, int z, int facing)
{
	// check adjacent neighbors, but not in push direction
	if (facing != Facing::DOWN && level->hasSignal(x, y - 1, z, Facing::DOWN)) return true;
	if (facing != Facing::UP && level->hasSignal(x, y + 1, z, Facing::UP)) return true;
	if (facing != Facing::NORTH && level->hasSignal(x, y, z - 1, Facing::NORTH)) return true;
	if (facing != Facing::SOUTH && level->hasSignal(x, y, z + 1, Facing::SOUTH)) return true;
	if (facing != Facing::EAST && level->hasSignal(x + 1, y, z, Facing::EAST)) return true;
	if (facing != Facing::WEST && level->hasSignal(x - 1, y, z, Facing::WEST)) return true;

	// check signals above
	if (level->hasSignal(x, y, z, 0)) return true;
	if (level->hasSignal(x, y + 2, z, 1)) return true;
	if (level->hasSignal(x, y + 1, z - 1, 2)) return true;
	if (level->hasSignal(x, y + 1, z + 1, 3)) return true;
	if (level->hasSignal(x - 1, y + 1, z, 4)) return true;
	if (level->hasSignal(x + 1, y + 1, z, 5)) return true;

	return false;
}

bool PistonBaseTile::triggerEvent(Level *level, int x, int y, int z, int param1, int facing)
{

	if (!level->isClientSide)
	{
		bool extend = getNeighborSignal(level, x, y, z, facing);

		if (extend && param1 == TRIGGER_CONTRACT)
		{
			level->setData(x, y, z, facing | EXTENDED_BIT, UPDATE_CLIENTS);
			return false;
		}
		else if (!extend && param1 == TRIGGER_EXTEND)
		{
			return false;
		}
	}

	if (param1 == TRIGGER_EXTEND)
	{
#if defined(_WINDOWS64) && defined(MINECRAFT_SERVER_BUILD)
		{
			int pushLength = 0;
			int cx = x + Facing::STEP_X[facing];
			int cy = y + Facing::STEP_Y[facing];
			int cz = z + Facing::STEP_Z[facing];
			for (int i = 0; i < MAX_PUSH_DEPTH + 1; i++)
			{
				int block = level->getTile(cx, cy, cz);
				if (block == 0) break;
				if (!isPushable(block, level, cx, cy, cz, true)) break;
				if (Tile::tiles[block]->getPistonPushReaction() == Material::PUSH_DESTROY) { pushLength++; break; }
				pushLength++;
				if (i == MAX_PUSH_DEPTH) break;
				cx += Facing::STEP_X[facing];
				cy += Facing::STEP_Y[facing];
				cz += Facing::STEP_Z[facing];
			}
			if (FourKitBridge::FirePistonExtend(level->dimension->id, x, y, z, facing, pushLength))
			{
				return false;
			}
		}
#endif
		PIXBeginNamedEvent(0,"Create push\n");
		if (createPush(level, x, y, z, facing))
		{
			// 4J - it is (currently) critical that this setData sends data to the client, so have added a bool to the method so that it sends data even if the data was already set to the same value
			// as before, which was actually its behaviour until a change in 1.0.1 meant that setData only conditionally sent updates to listeners. If the data update Isn't sent, then what
			// can happen is:
			// (1) the host sends the tile event to the client
			// (2) the client gets the tile event, and sets the tile/data value locally.
			// (3) just before setting the tile/data locally, the client will put the old value in the vector of things to be restored should an update not be received back from the host
			// (4) we don't get any update of the tile from the host, and so the old value gets restored on the client
			// (5) the piston base ends up being restored to its retracted state whilst the piston arm is extended
			// We really need to spend some time investigating a better way for pistons to work as it all seems a bit scary how the host/client interact, but forcing this to send should at least
			// restore the behaviour of the pistons to something closer to what they were before the 1.0.1 update. By sending this data update, then (4) in the list above doesn't happen
			// because the client does actually receive an update for this tile from the host after the event has been processed on the cient.
			level->setData(x, y, z, facing | EXTENDED_BIT, Tile::UPDATE_CLIENTS, true);
			level->playSound(x + 0.5, y + 0.5, z + 0.5, eSoundType_TILE_PISTON_OUT, 0.5f, level->random->nextFloat() * 0.25f + 0.6f);
		}
		else
		{
			return false;
		}
		PIXEndNamedEvent();
	}
	else if (param1 == TRIGGER_CONTRACT)
	{
#if defined(_WINDOWS64) && defined(MINECRAFT_SERVER_BUILD)
		if (FourKitBridge::FirePistonRetract(level->dimension->id, x, y, z, facing))
		{
			level->setData(x, y, z, facing | EXTENDED_BIT, UPDATE_CLIENTS);
			return false;
		}
#endif
		PIXBeginNamedEvent(0,"Contract phase A\n");
		shared_ptr<TileEntity> prevTileEntity = level->getTileEntity(x + Facing::STEP_X[facing], y + Facing::STEP_Y[facing], z + Facing::STEP_Z[facing]);
		if (prevTileEntity != nullptr && dynamic_pointer_cast<PistonPieceEntity>(prevTileEntity) != nullptr)
		{
			dynamic_pointer_cast<PistonPieceEntity>(prevTileEntity)->finalTick();
		}

		stopSharingIfServer(level, x, y, z);	// 4J added
		level->setTileAndData(x, y, z, Tile::piston_extension_Id, facing, Tile::UPDATE_ALL);
		level->setTileEntity(x, y, z, PistonMovingPiece::newMovingPieceEntity(id, facing, facing, false, true));

		PIXEndNamedEvent();

		// sticky movement
		if (isSticky)
		{
			PIXBeginNamedEvent(0,"Contract sticky phase A\n");
			int twoX = x + Facing::STEP_X[facing] * 2;
			int twoY = y + Facing::STEP_Y[facing] * 2;
			int twoZ = z + Facing::STEP_Z[facing] * 2;
			int block = level->getTile(twoX, twoY, twoZ);
			int blockData = level->getData(twoX, twoY, twoZ);
			bool pistonPiece = false;

			PIXEndNamedEvent();

			if (block == Tile::piston_extension_Id)
			{
				PIXBeginNamedEvent(0,"Contract sticky phase B\n");
				// the block two steps away is a moving piston block piece, so replace it with the real data,
				// since it's probably this piston which is changing too fast
				shared_ptr<TileEntity> tileEntity = level->getTileEntity(twoX, twoY, twoZ);
				if (tileEntity != nullptr && dynamic_pointer_cast<PistonPieceEntity>(tileEntity) != nullptr )
				{
					shared_ptr<PistonPieceEntity> ppe = dynamic_pointer_cast<PistonPieceEntity>(tileEntity);

					if (ppe->getFacing() == facing && ppe->isExtending())
					{
						// force the tile to air before pushing
						ppe->finalTick();
						block = ppe->getId();
						blockData = ppe->getData();
						pistonPiece = true;
					}
				}
				PIXEndNamedEvent();
			}

			PIXBeginNamedEvent(0,"Contract sticky phase C\n");
			{
				int pullDir = Facing::OPPOSITE_FACING[facing];
				int armX = x + Facing::STEP_X[facing];
				int armY = y + Facing::STEP_Y[facing];
				int armZ = z + Facing::STEP_Z[facing];

				bool canPull = block > 0
					&& isPushable(block, level, twoX, twoY, twoZ, false)
					&& (Tile::tiles[block]->getPistonPushReaction() == Material::PUSH_NORMAL
						|| Tile::tiles[block]->getPistonPushReaction() == Material::PUSH_SLIME
						|| block == Tile::piston_Id
						|| block == Tile::sticky_piston_Id);

				if (canPull)
				{
					std::vector<BlockPos3> toMove, toDestroy;
					bool ok = collectStructure(level, pullDir,
						twoX, twoY, twoZ,
						x, y, z,
						armX, armY, armZ,
						false,
						toMove, toDestroy);

					if (ok && !toMove.empty())
					{
						applyStructureMove(level, x, y, z, facing, pullDir, isSticky,
							toMove, toDestroy, false);
					}
					else if (block > 0 && Tile::tiles[block]->getPistonPushReaction() == Material::PUSH_SLIME)
					{
						std::vector<BlockPos3> fallbackMove;
						std::vector<BlockPos3> fallbackDestroy;
						bool fallbackOk = collectStructure(level, pullDir,
							twoX, twoY, twoZ,
							x, y, z,
							armX, armY, armZ,
							true,
							fallbackMove, fallbackDestroy);
						if (fallbackOk && !fallbackMove.empty())
						{
							applyStructureMove(level, x, y, z, facing, pullDir, isSticky,
								fallbackMove, fallbackDestroy, false);
						}
						else
						{
							stopSharingIfServer(level, armX, armY, armZ);
							level->removeTile(armX, armY, armZ);
						}
					}
					else
					{
						stopSharingIfServer(level, armX, armY, armZ);
						level->removeTile(armX, armY, armZ);
					}
				}
				else
				{
					stopSharingIfServer(level, armX, armY, armZ);
					level->removeTile(armX, armY, armZ);
				}
			}
			PIXEndNamedEvent();
		}
		else
		{
			stopSharingIfServer(level, x + Facing::STEP_X[facing], y + Facing::STEP_Y[facing], z + Facing::STEP_Z[facing]);	// 4J added
			level->removeTile(x + Facing::STEP_X[facing], y + Facing::STEP_Y[facing], z + Facing::STEP_Z[facing]);
		}

		level->playSound(x + 0.5, y + 0.5, z + 0.5, eSoundType_TILE_PISTON_IN, 0.5f, level->random->nextFloat() * 0.15f + 0.6f);
	}

	return true;
}

void PistonBaseTile::updateShape(LevelSource *level, int x, int y, int z, int forceData, shared_ptr<TileEntity> forceEntity) // 4J added forceData, forceEntity param
{
	int data = (forceData == -1 ) ? level->getData(x, y, z) : forceData;

	if (isExtended(data))
	{
		const float thickness = PLATFORM_THICKNESS / 16.0f;
		switch (getFacing(data))
		{
		case Facing::DOWN:
			setShape(0, thickness, 0, 1, 1, 1);
			break;
		case Facing::UP:
			setShape(0, 0, 0, 1, 1 - thickness, 1);
			break;
		case Facing::NORTH:
			setShape(0, 0, thickness, 1, 1, 1);
			break;
		case Facing::SOUTH:
			setShape(0, 0, 0, 1, 1, 1 - thickness);
			break;
		case Facing::WEST:
			setShape(thickness, 0, 0, 1, 1, 1);
			break;
		case Facing::EAST:
			setShape(0, 0, 0, 1 - thickness, 1, 1);
			break;
		}
	}
	else
	{
		setShape(0, 0, 0, 1, 1, 1);
	}
}

void PistonBaseTile::updateDefaultShape()
{
	setShape(0, 0, 0, 1, 1, 1);
}

void PistonBaseTile::addAABBs(Level *level, int x, int y, int z, AABB *box, AABBList *boxes, shared_ptr<Entity> source)
{
	setShape(0, 0, 0, 1, 1, 1);
	Tile::addAABBs(level, x, y, z, box, boxes, source);
}

AABB *PistonBaseTile::getAABB(Level *level, int x, int y, int z)
{
	updateShape(level, x, y, z);
	return Tile::getAABB(level, x, y, z);
}

bool PistonBaseTile::isCubeShaped()
{
	return false;
}

int PistonBaseTile::getFacing(int data)
{
	return data & 0x7;
}

bool PistonBaseTile::isExtended(int data)
{
	return (data & EXTENDED_BIT) != 0;
}

int PistonBaseTile::getNewFacing(Level *level, int x, int y, int z, shared_ptr<LivingEntity> player)
{
	if (Mth::abs(static_cast<float>(player->x) - x) < 2 && Mth::abs(static_cast<float>(player->z) - z) < 2) 
	{
		// If the player is above the block, the slot is on the top
		double py = player->y + 1.82 - player->heightOffset;
		if (py - y > 2)
		{
			return Facing::UP;
		}
		// If the player is below the block, the slot is on the bottom
		if (y - py > 0)
		{
			return Facing::DOWN;
		}
	}
	// The slot is on the side
	int i = Mth::floor(player->yRot * 4.0f / 360.0f + 0.5) & 0x3;
	if (i == 0) return Facing::NORTH;
	if (i == 1) return Facing::EAST;
	if (i == 2) return Facing::SOUTH;
	if (i == 3) return Facing::WEST;
	return 0;
}

bool PistonBaseTile::isPushable(int block, Level *level, int cx, int cy, int cz, bool allowDestroyable)
{
	Tile *tile = Tile::tiles[block];
	if (tile == nullptr) return false; // tu31 tutorial world fix

	// special case for obsidian
	if (block == Tile::obsidian_Id)
	{
		return false;
	}

	if (block == Tile::piston_Id || block == Tile::sticky_piston_Id)
	{
		// special case for piston bases
		if (isExtended(level->getData(cx, cy, cz)))
		{
			return false;
		}
	}
	else
	{
		if (tile->getDestroySpeed(level, cx, cy, cz) == Tile::INDESTRUCTIBLE_DESTROY_TIME)
		{
			return false;
		}

		if (tile->getPistonPushReaction() == Material::PUSH_BLOCK)
		{
			return false;
		}

		if (tile->getPistonPushReaction() == Material::PUSH_DESTROY)
		{
			if(!allowDestroyable)
			{
				return false;
			}
			return true;
		}
	}

	if( tile->isEntityTile() )	// 4J - java uses instanceof EntityTile here
	{
		// may not push tile entities
		return false;
	}

	return true;
}

bool PistonBaseTile::canPush(Level *level, int sx, int sy, int sz, int facing)
{
	std::vector<BlockPos3> toMove, toDestroy;
	return collectStructure(level, facing,
		sx + Facing::STEP_X[facing], sy + Facing::STEP_Y[facing], sz + Facing::STEP_Z[facing],
		sx, sy, sz,
		INT_MIN, 0, 0,
		true,
		toMove, toDestroy);
}

bool PistonBaseTile::collectStructure(Level *level, int moveDir,
	int startX, int startY, int startZ,
	int skipX, int skipY, int skipZ,
	int skip2X, int skip2Y, int skip2Z,
	bool allowDestroy,
	std::vector<BlockPos3> &toMove,
	std::vector<BlockPos3> &toDestroy)
{
	std::deque<BlockPos3> queue;
	std::vector<BlockPos3> visited;

	auto hasVisited = [&](int x, int y, int z) -> bool {
		for (auto &v : visited) if (v.x == x && v.y == y && v.z == z) return true;
		return false;
	};
	auto isSkipped = [&](int x, int y, int z) -> bool {
		if (x == skipX && y == skipY && z == skipZ) return true;
		if (x == skip2X && y == skip2Y && z == skip2Z) return true;
		return false;
	};

	queue.push_back({startX, startY, startZ});

	while (!queue.empty())
	{
		BlockPos3 pos = queue.front();
		queue.pop_front();

		if (hasVisited(pos.x, pos.y, pos.z)) continue;
		if (isSkipped(pos.x, pos.y, pos.z)) continue;
		visited.push_back(pos);

		if (pos.y <= 0 || pos.y >= (Level::maxBuildHeight - 1)) return false;
		int minXZ = -(level->dimension->getXZSize() * 16) / 2;
		int maxXZ = (level->dimension->getXZSize() * 16) / 2 - 1;
		if (pos.x <= minXZ || pos.x >= maxXZ || pos.z <= minXZ || pos.z >= maxXZ) return false;

		int block = level->getTile(pos.x, pos.y, pos.z);
		if (block == 0) continue;

		if (!isPushable(block, level, pos.x, pos.y, pos.z, allowDestroy)) return false;

		int reaction = Tile::tiles[block]->getPistonPushReaction();

		if (reaction == Material::PUSH_DESTROY)
		{
			toDestroy.push_back(pos);
			continue;
		}

		if ((int)toMove.size() >= MAX_PUSH_DEPTH) return false;
		toMove.push_back(pos);

		queue.push_back({pos.x + Facing::STEP_X[moveDir],
		                 pos.y + Facing::STEP_Y[moveDir],
		                 pos.z + Facing::STEP_Z[moveDir]});

		if (reaction == Material::PUSH_SLIME)
		{
			for (int d = 0; d < 6; d++)
			{
				if (d == moveDir) continue;
				int nx = pos.x + Facing::STEP_X[d];
				int ny = pos.y + Facing::STEP_Y[d];
				int nz = pos.z + Facing::STEP_Z[d];
				int neighborBlock = level->getTile(nx, ny, nz);
				if (neighborBlock == 0) continue;
				if (!isPushable(neighborBlock, level, nx, ny, nz, false)) continue;
				queue.push_back({nx, ny, nz});
			}
		}
	}

	return true;
}

void PistonBaseTile::applyStructureMove(Level *level,
	int pistonX, int pistonY, int pistonZ,
	int facing, int moveDir, bool sticky,
	std::vector<BlockPos3> &toMove,
	std::vector<BlockPos3> &toDestroy,
	bool isExtension)
{
	for (auto &dpos : toDestroy)
	{
		int block = level->getTile(dpos.x, dpos.y, dpos.z);
		if (block > 0)
		{
			Tile::tiles[block]->spawnResources(level, dpos.x, dpos.y, dpos.z, level->getData(dpos.x, dpos.y, dpos.z), 0);
			stopSharingIfServer(level, dpos.x, dpos.y, dpos.z);
			level->removeTile(dpos.x, dpos.y, dpos.z);
		}
	}

	int n = (int)toMove.size();
	int armX = pistonX + Facing::STEP_X[facing];
	int armY = pistonY + Facing::STEP_Y[facing];
	int armZ = pistonZ + Facing::STEP_Z[facing];

	if (n == 0)
	{
		if (isExtension)
		{
			int armData = facing | (sticky ? PistonExtensionTile::STICKY_BIT : 0);
			stopSharingIfServer(level, armX, armY, armZ);
			level->setTileAndData(armX, armY, armZ, Tile::piston_extension_Id, armData, Tile::UPDATE_NONE);
			level->setTileEntity(armX, armY, armZ,
				PistonMovingPiece::newMovingPieceEntity(Tile::piston_head_Id, armData, facing, true, false));
		}
		return;
	}

	std::vector<int> savedBlocks(n), savedDatas(n);
	for (int i = 0; i < n; i++)
	{
		savedBlocks[i] = level->getTile(toMove[i].x, toMove[i].y, toMove[i].z);
		savedDatas[i] = level->getData(toMove[i].x, toMove[i].y, toMove[i].z);
	}

	std::sort(toMove.begin(), toMove.end(),
		[&](const BlockPos3 &a, const BlockPos3 &b) {
			int da = a.x * Facing::STEP_X[moveDir] + a.y * Facing::STEP_Y[moveDir] + a.z * Facing::STEP_Z[moveDir];
			int db = b.x * Facing::STEP_X[moveDir] + b.y * Facing::STEP_Y[moveDir] + b.z * Facing::STEP_Z[moveDir];
			return da > db;
		});

	for (int i = 0; i < n; i++)
	{
		savedBlocks[i] = level->getTile(toMove[i].x, toMove[i].y, toMove[i].z);
		savedDatas[i] = level->getData(toMove[i].x, toMove[i].y, toMove[i].z);
	}

	for (int i = 0; i < n; i++)
	{
		auto &pos = toMove[i];
		int destX = pos.x + Facing::STEP_X[moveDir];
		int destY = pos.y + Facing::STEP_Y[moveDir];
		int destZ = pos.z + Facing::STEP_Z[moveDir];

		stopSharingIfServer(level, destX, destY, destZ);
		level->setTileAndData(destX, destY, destZ, Tile::piston_extension_Id, savedDatas[i], Tile::UPDATE_NONE);
		level->setTileEntity(destX, destY, destZ,
			PistonMovingPiece::newMovingPieceEntity(savedBlocks[i], savedDatas[i], facing, isExtension, false));
	}

	if (isExtension)
	{
		int armData = facing | (sticky ? PistonExtensionTile::STICKY_BIT : 0);
		stopSharingIfServer(level, armX, armY, armZ);
		level->setTileAndData(armX, armY, armZ, Tile::piston_extension_Id, armData, Tile::UPDATE_NONE);
		level->setTileEntity(armX, armY, armZ,
			PistonMovingPiece::newMovingPieceEntity(Tile::piston_head_Id, armData, facing, true, false));
	}

	for (int i = 0; i < n; i++)
	{
		auto &pos = toMove[i];

		if (isExtension && pos.x == armX && pos.y == armY && pos.z == armZ)
			continue;

		int srcX = pos.x - Facing::STEP_X[moveDir];
		int srcY = pos.y - Facing::STEP_Y[moveDir];
		int srcZ = pos.z - Facing::STEP_Z[moveDir];
		bool receivesBlock = false;
		for (auto &src : toMove)
		{
			if (src.x == srcX && src.y == srcY && src.z == srcZ)
			{
				receivesBlock = true;
				break;
			}
		}
		if (!receivesBlock)
		{
			stopSharingIfServer(level, pos.x, pos.y, pos.z);
			level->setTileAndData(pos.x, pos.y, pos.z, 0, 0, Tile::UPDATE_CLIENTS);
		}
	}

	for (int i = 0; i < n; i++)
	{
		level->updateNeighborsAt(toMove[i].x, toMove[i].y, toMove[i].z, savedBlocks[i]);
	}
}

void PistonBaseTile::stopSharingIfServer(Level *level, int x, int y, int z)
{
	if( !level->isClientSide )
	{ 
		MultiPlayerLevel *clientLevel = Minecraft::GetInstance()->getLevel(level->dimension->id);
		if( clientLevel )
		{
			LevelChunk *lc = clientLevel->getChunkAt( x, z );
			lc->stopSharingTilesAndData();
		}
	}
}

bool PistonBaseTile::createPush(Level *level, int sx, int sy, int sz, int facing)
{
	std::vector<BlockPos3> toMove, toDestroy;

	if (!collectStructure(level, facing,
		sx + Facing::STEP_X[facing], sy + Facing::STEP_Y[facing], sz + Facing::STEP_Z[facing],
		sx, sy, sz,
		INT_MIN, 0, 0,
		true,
		toMove, toDestroy))
	{
		return false;
	}

	applyStructureMove(level, sx, sy, sz, facing, facing, isSticky,
		toMove, toDestroy, true);

	return true;
}