Revert "Block: Get rid of state bitmasks"

This reverts commit b7b05e729e4fcfbe74786342882d011f004658fa.

Apparently this was premature, because we still need these things to deal with default state remapping.

src/pocketmine/block/Anvil.php

@@ -50,7 +50,11 @@ class Anvil extends Transparent implements Fallable{
 	}
 
 	public function readStateFromData(int $id, int $stateMeta) : void{
-		$this->facing = BlockDataValidator::readLegacyHorizontalFacing($stateMeta & 0x03);
+		$this->facing = BlockDataValidator::readLegacyHorizontalFacing($stateMeta);
+	}
+
+	public function getStateBitmask() : int{
+		return 0b11;
 	}
 
 	public function getHardness() : float{

src/pocketmine/block/BaseRail.php

@@ -95,6 +95,10 @@ abstract class BaseRail extends Flowable{
 		$this->connections = $connections;
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1111;
+	}
+
 	public function getHardness() : float{
 		return 0.7;
 	}

src/pocketmine/block/Bed.php

@@ -68,6 +68,10 @@ class Bed extends Transparent{
 		$this->head = ($stateMeta & self::BITFLAG_HEAD) !== 0;
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1111;
+	}
+
 	public function readStateFromWorld() : void{
 		parent::readStateFromWorld();
 		//read extra state information from the tile - this is an ugly hack

src/pocketmine/block/Block.php

@@ -43,6 +43,8 @@ use pocketmine\Player;
 use pocketmine\plugin\Plugin;
 use pocketmine\tile\TileFactory;
 use function array_merge;
+use function assert;
+use function dechex;
 use function get_class;
 use const PHP_INT_MAX;
 
@@ -80,6 +82,9 @@ class Block extends Position implements BlockIds, Metadatable{
 	 * @param string          $name English name of the block type (TODO: implement translations)
 	 */
 	public function __construct(BlockIdentifier $idInfo, string $name){
+		if(($idInfo->getVariant() & $this->getStateBitmask()) !== 0){
+			throw new \InvalidArgumentException("Variant 0x" . dechex($idInfo->getVariant()) . " collides with state bitmask 0x" . dechex($this->getStateBitmask()));
+		}
 		$this->idInfo = $idInfo;
 		$this->fallbackName = $name;
 	}
@@ -118,7 +123,9 @@ class Block extends Position implements BlockIds, Metadatable{
 	 * @return int
 	 */
 	public function getDamage() : int{
-		return $this->idInfo->getVariant() | $this->writeStateToMeta();
+		$stateMeta = $this->writeStateToMeta();
+		assert(($stateMeta & ~$this->getStateBitmask()) === 0);
+		return $this->idInfo->getVariant() | $stateMeta;
 	}
 
 	protected function writeStateToMeta() : int{
@@ -161,6 +168,15 @@ class Block extends Position implements BlockIds, Metadatable{
 		}
 	}
 
+	/**
+	 * Returns a bitmask used to extract state bits from block metadata.
+	 *
+	 * @return int
+	 */
+	public function getStateBitmask() : int{
+		return 0;
+	}
+
 	/**
 	 * Returns whether the given block has an equivalent type to this one. This compares base legacy ID and variant.
 	 *

src/pocketmine/block/BlockFactory.php

@@ -527,17 +527,20 @@ class BlockFactory{
 	 * $override parameter.
 	 */
 	public static function register(Block $block, bool $override = false) : void{
-		foreach($block->getIdInfo()->getAllBlockIds() as $id){
+		$variant = $block->getIdInfo()->getVariant();
-			for($m = 0; $m < 16; ++$m){
-				$index = ($id << 4) | $m;
 
-				$v = clone $block;
+		$stateMask = $block->getStateBitmask();
-				try{
+		if(($variant & $stateMask) !== 0){
-					$v->readStateFromData($id, $m);
+			throw new \InvalidArgumentException("Block variant collides with state bitmask");
-					if($v->getDamage() !== $m){
-						throw new InvalidBlockStateException("Corrupted meta"); //don't register anything that isn't the same when we read it back again
 		}
-				}catch(InvalidBlockStateException $e){ //invalid property combination
+
+		foreach($block->getIdInfo()->getAllBlockIds() as $id){
+			if(!$override and self::isRegistered($id, $variant)){
+				throw new \InvalidArgumentException("Block registration $id:$variant conflicts with an existing block");
+			}
+
+			for($m = $variant; $m <= ($variant | $stateMask); ++$m){
+				if(($m & ~$stateMask) !== $variant){
 					continue;
 				}
 
@@ -545,10 +548,21 @@ class BlockFactory{
 					throw new \InvalidArgumentException("Block registration " . get_class($block) . " has states which conflict with other blocks");
 				}
 
+				$index = ($id << 4) | $m;
+
+				$v = clone $block;
+				try{
+					$v->readStateFromData($id, $m & $stateMask);
+					if($v->getDamage() !== $m){
+						throw new InvalidBlockStateException("Corrupted meta"); //don't register anything that isn't the same when we read it back again
+					}
+				}catch(InvalidBlockStateException $e){ //invalid property combination
+					continue;
+				}
+
 				self::fillStaticArrays($index, $v);
 			}
 
-			$variant = $block->getIdInfo()->getVariant();
 			if(!self::isRegistered($id, $variant)){
 				self::fillStaticArrays(($id << 4) | $variant, $block); //register default state mapped to variant, for blocks which don't use 0 as valid state
 			}

src/pocketmine/block/BrewingStand.php

@@ -44,6 +44,10 @@ class BrewingStand extends Transparent{
 		$this->northwestSlot = ($stateMeta & 0x04) !== 0;
 	}
 
+	public function getStateBitmask() : int{
+		return 0b111;
+	}
+
 	public function getHardness() : float{
 		return 0.5;
 	}

src/pocketmine/block/Button.php

@@ -47,6 +47,10 @@ abstract class Button extends Flowable{
 		$this->powered = ($stateMeta & 0x08) !== 0;
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1111;
+	}
+
 	public function place(Item $item, Block $blockReplace, Block $blockClicked, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
 		//TODO: check valid target block
 		$this->facing = $face;

src/pocketmine/block/Cactus.php

@@ -47,6 +47,10 @@ class Cactus extends Transparent{
 		$this->age = BlockDataValidator::readBoundedInt("age", $stateMeta, 0, 15);
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1111;
+	}
+
 	public function getHardness() : float{
 		return 0.4;
 	}

src/pocketmine/block/Cake.php

@@ -46,6 +46,10 @@ class Cake extends Transparent implements FoodSource{
 		$this->bites = BlockDataValidator::readBoundedInt("bites", $stateMeta, 0, 6);
 	}
 
+	public function getStateBitmask() : int{
+		return 0b111;
+	}
+
 	public function getHardness() : float{
 		return 0.5;
 	}

src/pocketmine/block/Chest.php

@@ -44,6 +44,10 @@ class Chest extends Transparent{
 		$this->facing = BlockDataValidator::readHorizontalFacing($stateMeta);
 	}
 
+	public function getStateBitmask() : int{
+		return 0b111;
+	}
+
 	public function getHardness() : float{
 		return 2.5;
 	}

src/pocketmine/block/CocoaBlock.php

@@ -51,6 +51,10 @@ class CocoaBlock extends Transparent{
 		$this->age = BlockDataValidator::readBoundedInt("age", $stateMeta >> 2, 0, 2);
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1111;
+	}
+
 	public function getHardness() : float{
 		return 0.2;
 	}

src/pocketmine/block/Crops.php

@@ -44,6 +44,10 @@ abstract class Crops extends Flowable{
 		$this->age = BlockDataValidator::readBoundedInt("age", $stateMeta, 0, 7);
 	}
 
+	public function getStateBitmask() : int{
+		return 0b111;
+	}
+
 	public function place(Item $item, Block $blockReplace, Block $blockClicked, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
 		if($blockReplace->getSide(Facing::DOWN)->getId() === Block::FARMLAND){
 			return parent::place($item, $blockReplace, $blockClicked, $face, $clickVector, $player);

src/pocketmine/block/DaylightSensor.php

@@ -57,6 +57,10 @@ class DaylightSensor extends Transparent{
 		$this->inverted = $id === $this->idInfo->getSecondId();
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1111;
+	}
+
 	public function isInverted() : bool{
 		return $this->inverted;
 	}

src/pocketmine/block/Door.php

@@ -67,6 +67,10 @@ abstract class Door extends Transparent{
 		}
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1111;
+	}
+
 	public function readStateFromWorld() : void{
 		parent::readStateFromWorld();
 

src/pocketmine/block/DoublePlant.php

@@ -43,6 +43,10 @@ class DoublePlant extends Flowable{
 		$this->top = ($stateMeta & self::BITFLAG_TOP) !== 0;
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1000;
+	}
+
 	public function place(Item $item, Block $blockReplace, Block $blockClicked, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
 		$id = $blockReplace->getSide(Facing::DOWN)->getId();
 		if(($id === Block::GRASS or $id === Block::DIRT) and $blockReplace->getSide(Facing::UP)->canBeReplaced()){

src/pocketmine/block/EndPortalFrame.php

@@ -47,6 +47,10 @@ class EndPortalFrame extends Solid{
 		$this->eye = ($stateMeta & 0x04) !== 0;
 	}
 
+	public function getStateBitmask() : int{
+		return 0b111;
+	}
+
 	public function getLightLevel() : int{
 		return 1;
 	}

src/pocketmine/block/EndRod.php

@@ -50,6 +50,10 @@ class EndRod extends Flowable{
 		$this->facing = BlockDataValidator::readFacing($stateMeta);
 	}
 
+	public function getStateBitmask() : int{
+		return 0b111;
+	}
+
 	public function place(Item $item, Block $blockReplace, Block $blockClicked, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
 		$this->facing = $face;
 		if($blockClicked instanceof EndRod and $blockClicked->facing === $this->facing){

src/pocketmine/block/Farmland.php

@@ -42,6 +42,10 @@ class Farmland extends Transparent{
 		$this->wetness = BlockDataValidator::readBoundedInt("wetness", $stateMeta, 0, 7);
 	}
 
+	public function getStateBitmask() : int{
+		return 0b111;
+	}
+
 	public function getHardness() : float{
 		return 0.6;
 	}

src/pocketmine/block/FenceGate.php

@@ -50,6 +50,10 @@ class FenceGate extends Transparent{
 		$this->inWall = ($stateMeta & 0x08) !== 0;
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1111;
+	}
+
 	public function getHardness() : float{
 		return 2;
 	}

src/pocketmine/block/Fire.php

@@ -48,6 +48,10 @@ class Fire extends Flowable{
 		$this->age = BlockDataValidator::readBoundedInt("age", $stateMeta, 0, 15);
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1111;
+	}
+
 	public function hasEntityCollision() : bool{
 		return true;
 	}

src/pocketmine/block/FlowerPot.php

@@ -43,6 +43,10 @@ class FlowerPot extends Flowable{
 		$this->occupied = $stateMeta !== 0;
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1111; //vanilla uses various values, we only care about 1 and 0 for PE
+	}
+
 	protected function recalculateBoundingBox() : ?AxisAlignedBB{
 		return AxisAlignedBB::one()->contract(3 / 16, 0, 3 / 16)->trim(Facing::UP, 5 / 8);
 	}

src/pocketmine/block/Furnace.php

@@ -53,6 +53,10 @@ class Furnace extends Solid{
 		$this->lit = $id === $this->idInfo->getSecondId();
 	}
 
+	public function getStateBitmask() : int{
+		return 0b111;
+	}
+
 	public function getHardness() : float{
 		return 3.5;
 	}

src/pocketmine/block/GlazedTerracotta.php

@@ -44,6 +44,10 @@ class GlazedTerracotta extends Solid{
 		$this->facing = BlockDataValidator::readHorizontalFacing($stateMeta);
 	}
 
+	public function getStateBitmask() : int{
+		return 0b111;
+	}
+
 	public function getHardness() : float{
 		return 1.4;
 	}

src/pocketmine/block/ItemFrame.php

@@ -77,6 +77,10 @@ class ItemFrame extends Flowable{
 		}
 	}
 
+	public function getStateBitmask() : int{
+		return 0b111;
+	}
+
 	/**
 	 * @return int
 	 */

src/pocketmine/block/Ladder.php

@@ -44,6 +44,10 @@ class Ladder extends Transparent{
 		$this->facing = BlockDataValidator::readHorizontalFacing($stateMeta);
 	}
 
+	public function getStateBitmask() : int{
+		return 0b111;
+	}
+
 	public function hasEntityCollision() : bool{
 		return true;
 	}

src/pocketmine/block/Leaves.php

@@ -56,6 +56,10 @@ class Leaves extends Transparent{
 		$this->checkDecay = ($stateMeta & 0x08) !== 0;
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1100;
+	}
+
 	public function getHardness() : float{
 		return 0.2;
 	}

src/pocketmine/block/Lever.php

@@ -69,6 +69,10 @@ class Lever extends Flowable{
 		$this->powered = ($stateMeta & 0x08) !== 0;
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1111;
+	}
+
 	public function getHardness() : float{
 		return 0.5;
 	}

src/pocketmine/block/Liquid.php

@@ -77,6 +77,10 @@ abstract class Liquid extends Transparent{
 		$this->still = $id === $this->idInfo->getSecondId();
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1111;
+	}
+
 	public function hasEntityCollision() : bool{
 		return true;
 	}

src/pocketmine/block/NetherReactor.php

@@ -44,6 +44,10 @@ class NetherReactor extends Solid{
 		$this->state = BlockDataValidator::readBoundedInt("state", $stateMeta, 0, 2);
 	}
 
+	public function getStateBitmask() : int{
+		return 0b11;
+	}
+
 	public function getToolType() : int{
 		return BlockToolType::TYPE_PICKAXE;
 	}

src/pocketmine/block/NetherWartPlant.php

@@ -45,6 +45,10 @@ class NetherWartPlant extends Flowable{
 		$this->age = BlockDataValidator::readBoundedInt("age", $stateMeta, 0, 3);
 	}
 
+	public function getStateBitmask() : int{
+		return 0b11;
+	}
+
 	public function place(Item $item, Block $blockReplace, Block $blockClicked, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
 		$down = $this->getSide(Facing::DOWN);
 		if($down->getId() === Block::SOUL_SAND){

src/pocketmine/block/Pumpkin.php

@@ -43,6 +43,10 @@ class Pumpkin extends Solid{
 		return Bearing::fromFacing($this->facing);
 	}
 
+	public function getStateBitmask() : int{
+		return 0b11;
+	}
+
 	public function getHardness() : float{
 		return 1;
 	}

src/pocketmine/block/RedMushroomBlock.php

@@ -45,6 +45,10 @@ class RedMushroomBlock extends Solid{
 		$this->rotationData = $stateMeta;
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1111;
+	}
+
 	public function getHardness() : float{
 		return 0.2;
 	}

src/pocketmine/block/RedstoneRepeater.php

@@ -60,6 +60,10 @@ class RedstoneRepeater extends Flowable{
 		return Bearing::fromFacing($this->facing) | (($this->delay - 1) << 2);
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1111;
+	}
+
 	protected function recalculateBoundingBox() : ?AxisAlignedBB{
 		return AxisAlignedBB::one()->trim(Facing::UP, 7 / 8);
 	}

src/pocketmine/block/RedstoneWire.php

@@ -38,6 +38,10 @@ class RedstoneWire extends Flowable{
 		return $this->power;
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1111;
+	}
+
 	public function readStateFromWorld() : void{
 		parent::readStateFromWorld();
 		//TODO: check connections to nearby redstone components

src/pocketmine/block/Sapling.php

@@ -53,6 +53,10 @@ class Sapling extends Flowable{
 		$this->ready = ($stateMeta & 0x08) !== 0;
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1000;
+	}
+
 	public function place(Item $item, Block $blockReplace, Block $blockClicked, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
 		$down = $this->getSide(Facing::DOWN);
 		if($down->getId() === self::GRASS or $down->getId() === self::DIRT or $down->getId() === self::FARMLAND){

src/pocketmine/block/SignPost.php

@@ -43,6 +43,10 @@ class SignPost extends Transparent{
 		$this->rotation = $stateMeta;
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1111;
+	}
+
 	public function getHardness() : float{
 		return 1;
 	}

src/pocketmine/block/SimplePressurePlate.php

@@ -35,4 +35,8 @@ abstract class SimplePressurePlate extends PressurePlate{
 	public function readStateFromData(int $id, int $stateMeta) : void{
 		$this->powered = $stateMeta !== 0;
 	}
+
+	public function getStateBitmask() : int{
+		return 0b1;
+	}
 }

src/pocketmine/block/Skull.php

@@ -50,6 +50,10 @@ class Skull extends Flowable{
 		$this->facing = $stateMeta === 1 ? Facing::UP : BlockDataValidator::readHorizontalFacing($stateMeta);
 	}
 
+	public function getStateBitmask() : int{
+		return 0b111;
+	}
+
 	public function readStateFromWorld() : void{
 		parent::readStateFromWorld();
 		$tile = $this->level->getTile($this);

src/pocketmine/block/Slab.php

@@ -61,6 +61,10 @@ abstract class Slab extends Transparent{
 		}
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1000;
+	}
+
 	public function isTransparent() : bool{
 		return $this->slabType !== SlabType::DOUBLE();
 	}

src/pocketmine/block/SnowLayer.php

@@ -50,6 +50,10 @@ class SnowLayer extends Flowable implements Fallable{
 		$this->layers = BlockDataValidator::readBoundedInt("layers", $stateMeta + 1, 1, 8);
 	}
 
+	public function getStateBitmask() : int{
+		return 0b111;
+	}
+
 	public function canBeReplaced() : bool{
 		return $this->layers < 8;
 	}

src/pocketmine/block/Sponge.php

@@ -37,6 +37,10 @@ class Sponge extends Solid{
 		$this->wet = $stateMeta !== 0;
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1;
+	}
+
 	public function getHardness() : float{
 		return 0.6;
 	}

src/pocketmine/block/Stair.php

@@ -53,6 +53,10 @@ abstract class Stair extends Transparent{
 		$this->upsideDown = ($stateMeta & 0x04) !== 0;
 	}
 
+	public function getStateBitmask() : int{
+		return 0b111;
+	}
+
 	public function readStateFromWorld() : void{
 		parent::readStateFromWorld();
 

src/pocketmine/block/StandingBanner.php

@@ -46,6 +46,10 @@ class StandingBanner extends Transparent{
 		$this->rotation = $stateMeta;
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1111;
+	}
+
 	public function getHardness() : float{
 		return 1;
 	}

src/pocketmine/block/Sugarcane.php

@@ -44,6 +44,10 @@ class Sugarcane extends Flowable{
 		$this->age = BlockDataValidator::readBoundedInt("age", $stateMeta, 0, 15);
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1111;
+	}
+
 	public function onActivate(Item $item, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
 		if($item instanceof Fertilizer){
 			if($this->getSide(Facing::DOWN)->getId() !== self::SUGARCANE_BLOCK){

src/pocketmine/block/Torch.php

@@ -39,10 +39,13 @@ class Torch extends Flowable{
 	}
 
 	public function readStateFromData(int $id, int $stateMeta) : void{
-		$stateMeta &= 0x07;
 		$this->facing = $stateMeta === 5 ? Facing::UP : BlockDataValidator::readHorizontalFacing(6 - $stateMeta);
 	}
 
+	public function getStateBitmask() : int{
+		return 0b111;
+	}
+
 	public function getLightLevel() : int{
 		return 14;
 	}

src/pocketmine/block/Trapdoor.php

@@ -54,6 +54,10 @@ class Trapdoor extends Transparent{
 		$this->open = ($stateMeta & self::MASK_OPENED) !== 0;
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1111;
+	}
+
 	public function getHardness() : float{
 		return 3;
 	}

src/pocketmine/block/Tripwire.php

@@ -45,6 +45,10 @@ class Tripwire extends Flowable{
 		$this->disarmed = ($stateMeta & 0x08) !== 0;
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1111;
+	}
+
 	public function isAffectedBySilkTouch() : bool{
 		return false;
 	}

src/pocketmine/block/TripwireHook.php

@@ -49,6 +49,10 @@ class TripwireHook extends Flowable{
 		$this->powered = ($stateMeta & 0x08) !== 0;
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1111;
+	}
+
 	public function place(Item $item, Block $blockReplace, Block $blockClicked, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
 		if(Facing::axis($face) !== Facing::AXIS_Y){
 			//TODO: check face is valid

src/pocketmine/block/Vine.php

@@ -57,6 +57,10 @@ class Vine extends Flowable{
 		$this->setFaceFromMeta($stateMeta, self::FLAG_EAST, Facing::EAST);
 	}
 
+	public function getStateBitmask() : int{
+		return 0b1111;
+	}
+
 	private function setFaceFromMeta(int $meta, int $flag, int $face) : void{
 		if(($meta & $flag) !== 0){
 			$this->faces[$face] = true;

src/pocketmine/block/WallBanner.php

@@ -39,6 +39,10 @@ class WallBanner extends StandingBanner{
 		$this->facing = BlockDataValidator::readHorizontalFacing($stateMeta);
 	}
 
+	public function getStateBitmask() : int{
+		return 0b111;
+	}
+
 	public function onNearbyBlockChange() : void{
 		if($this->getSide(Facing::opposite($this->facing))->getId() === self::AIR){
 			$this->getLevel()->useBreakOn($this);

src/pocketmine/block/WallSign.php

@@ -39,6 +39,10 @@ class WallSign extends SignPost{
 		$this->facing = BlockDataValidator::readHorizontalFacing($stateMeta);
 	}
 
+	public function getStateBitmask() : int{
+		return 0b111;
+	}
+
 	public function onNearbyBlockChange() : void{
 		if($this->getSide(Facing::opposite($this->facing))->getId() === self::AIR){
 			$this->getLevel()->useBreakOn($this);

src/pocketmine/block/WeightedPressurePlate.php

@@ -37,4 +37,8 @@ abstract class WeightedPressurePlate extends PressurePlate{
 	public function readStateFromData(int $id, int $stateMeta) : void{
 		$this->power = BlockDataValidator::readBoundedInt("power", $stateMeta, 0, 15);
 	}
+
+	public function getStateBitmask() : int{
+		return 0b1111;
+	}
 }

src/pocketmine/block/utils/PillarRotationTrait.php

@@ -52,6 +52,14 @@ trait PillarRotationTrait{
 		$this->readAxisFromMeta($stateMeta);
 	}
 
+	/**
+	 * @see Block::getStateBitmask()
+	 * @return int
+	 */
+	public function getStateBitmask() : int{
+		return 0b1100;
+	}
+
 	protected function readAxisFromMeta(int $meta) : void{
 		static $map = [
 			0 => Facing::AXIS_Y,