Explosion: implemented underwater explosion

src/entity/object/PrimedTNT.php

@@ -23,6 +23,7 @@
 
 namespace pocketmine\entity\object;
 
+use pocketmine\block\BlockTypeIds;
 use pocketmine\block\VanillaBlocks;
 use pocketmine\entity\Entity;
 use pocketmine\entity\EntitySizeInfo;
@@ -120,8 +121,7 @@ public function explode() : void{
 		$ev = new EntityPreExplodeEvent($this, 4);
 		$ev->call();
 		if(!$ev->isCancelled()){
-			//TODO: deal with underwater TNT (underwater TNT treats water as if it has a blast resistance of 0)
-			$explosion = new Explosion(Position::fromObject($this->location->add(0, $this->size->getHeight() / 2, 0), $this->getWorld()), $ev->getRadius(), $this, $ev->getFireChance());
+			$explosion = new Explosion(Position::fromObject($this->location->add(0, $this->size->getHeight() / 2, 0), $this->getWorld()), $ev->getRadius(), $this, $ev->getFireChance(), $this->worksUnderwater ? [BlockTypeIds::WATER] : []);
 			if($ev->isBlockBreaking()){
 				$explosion->explodeA();
 			}

src/world/Explosion.php

@@ -46,7 +46,9 @@
 use pocketmine\world\sound\ExplodeSound;
 use pocketmine\world\utils\SubChunkExplorer;
 use pocketmine\world\utils\SubChunkExplorerStatus;
+use function array_fill_keys;
 use function ceil;
+use function count;
 use function floor;
 use function min;
 use function mt_rand;
@@ -69,11 +71,22 @@ class Explosion{
 
 	private SubChunkExplorer $subChunkExplorer;
 
+	/**
+	 * @var true[]
+	 * @phpstan-var array<int, true>
+	 */
+	private array $excludedBlockTypeIds = [];
+
+	/**
+	 * @param int[] $excludedBlockTypeIds
+	 * @phpstan-param array<int, int> $excludedBlockTypeIds
+	 */
 	public function __construct(
 		public Position $source,
 		public float $radius,
 		private Entity|Block|null $what = null,
-		private float $fireChance = 0.0
+		private float $fireChance = 0.0,
+		array $excludedBlockTypeIds = []
 	){
 		if(!$this->source->isValid()){
 			throw new \InvalidArgumentException("Position does not have a valid world");
@@ -87,6 +100,8 @@ public function __construct(
 			throw new \InvalidArgumentException("Explosion radius must be greater than 0, got $radius");
 		}
 		$this->subChunkExplorer = new SubChunkExplorer($this->world);
+
+		$this->excludedBlockTypeIds = array_fill_keys($excludedBlockTypeIds, true);
 	}
 
 	/**
@@ -135,6 +150,9 @@ public function explodeA() : bool{
 							}
 
 							$state = $subChunk->getBlockStateId($vBlockX & SubChunk::COORD_MASK, $vBlockY & SubChunk::COORD_MASK, $vBlockZ & SubChunk::COORD_MASK);
+							if(count($this->excludedBlockTypeIds) > 0 && isset($this->excludedBlockTypeIds[$blockFactory->fromStateId($state)->getTypeId()])){
+								continue;
+							}
 
 							$blastResistance = $blockFactory->blastResistance[$state] ?? 0;
 							if($blastResistance >= 0){