Implement snowlogging

src/block/Block.php

@@ -1030,7 +1030,7 @@ public function setLayer(int $layer) : static{
 	}
 
 	public function isLayerSupported(int $layer) : bool{
-		return $layer === 0;
+		return $layer === 0 || ($this->canBeSnowlogged() && $layer === 1);
 	}
 
 	/**
@@ -1058,4 +1058,12 @@ public function canWaterlogged(Liquid $water) : bool{
 	public function isWaterlogged() : bool{
 		return $this->getBlockLayer(1) instanceof Water;
 	}
+
+	public function canBeSnowlogged() : bool{
+		return false;
+	}
+
+	public function isSnowlogged() : bool{
+		return $this instanceof SnowLayer && $this->getBlockLayer(1)->canBeSnowlogged();
+	}
 }

src/block/Flower.php

@@ -41,4 +41,8 @@ public function getFlameEncouragement() : int{
 	public function getFlammability() : int{
 		return 100;
 	}
+
+	public function canBeSnowlogged() : bool{
+		return true;
+	}
 }

src/block/RedMushroom.php

@@ -53,4 +53,8 @@ public function place(BlockTransaction $tx, Item $item, Block $blockReplace, Blo
 
 		return false;
 	}
+
+	public function canBeSnowlogged() : bool{
+		return true;
+	}
 }

src/block/SnowLayer.php

@@ -92,7 +92,13 @@ public function place(BlockTransaction $tx, Item $item, Block $blockReplace, Blo
 			$this->layers = $blockReplace->layers + 1;
 		}
 		if($this->canBeSupportedAt($blockReplace)){
-			return parent::place($tx, $item, $blockReplace, $blockClicked, $face, $clickVector, $player);
+			parent::place($tx, $item, $blockReplace, $blockClicked, $face, $clickVector, $player);
+			if($blockReplace->canBeSnowlogged()){
+				$tx->addBlock($blockReplace->position, $blockReplace->setLayer(1));
+			}elseif($blockReplace->isSnowlogged()){
+				$tx->addBlock($blockReplace->position, $blockReplace->getBlockLayer(1));
+			}
+			return true;
 		}
 
 		return false;
@@ -114,8 +120,4 @@ public function getDropsForCompatibleTool(Item $item) : array{
 			VanillaItems::SNOWBALL()->setCount(max(1, (int) floor($this->layers / 2)))
 		];
 	}
-
-	public function isLayerSupported(int $layer) : bool{
-		return parent::isLayerSupported($layer) || $layer === 1;
-	}
 }

src/block/TallGrass.php

@@ -35,4 +35,8 @@ private function canBeSupportedAt(Block $block) : bool{
 		$supportBlock = $block->getSide(Facing::DOWN);
 		return $supportBlock->hasTypeTag(BlockTypeTags::DIRT) || $supportBlock->hasTypeTag(BlockTypeTags::MUD);
 	}
+
+	public function canBeSnowlogged() : bool{
+		return true;
+	}
 }

src/entity/object/FallingBlock.php

@@ -25,6 +25,7 @@
 
 use pocketmine\block\Block;
 use pocketmine\block\RuntimeBlockStateRegistry;
+use pocketmine\block\SnowLayer;
 use pocketmine\block\utils\Fallable;
 use pocketmine\block\Water;
 use pocketmine\data\bedrock\block\BlockStateDeserializeException;
@@ -143,14 +144,30 @@ protected function entityBaseTick(int $tickDiff = 1) : bool{
 
 				$blockResult = $blockTarget ?? $this->block;
 				$block = $world->getBlock($pos);
-				if(!$block->canBeReplaced() || !$world->isInWorld($pos->getFloorX(), $pos->getFloorY(), $pos->getFloorZ()) || ($this->onGround && abs($this->location->y - $this->location->getFloorY()) > 0.001)){
+				$down = $world->getBlock($pos->down());
+				if((!$block->canBeReplaced() || !$world->isInWorld($pos->getFloorX(), $pos->getFloorY(), $pos->getFloorZ()) || ($this->onGround && abs($this->location->y - $this->location->getFloorY()) > 0.001)) && !(($block instanceof SnowLayer || $down instanceof SnowLayer) && $blockResult instanceof SnowLayer)){
 					$world->dropItem($this->location, $this->block->asItem());
 					$world->addSound($pos->add(0.5, 0.5, 0.5), new BlockBreakSound($blockResult));
 				}else{
 					$ev = new EntityBlockChangeEvent($this, $block, $blockResult);
 					$ev->call();
 					if(!$ev->isCancelled()){
 						$b = $ev->getTo();
+						if($b instanceof SnowLayer){
+							$otherSnow = $down instanceof SnowLayer && $down->getLayers() < SnowLayer::MAX_LAYERS ? $down : $block;
+							if($block->canBeSnowlogged()){
+								$world->setBlockLayer($pos, $block, 1);
+							}elseif($otherSnow instanceof SnowLayer){
+								$layers = $otherSnow->getLayers() + $b->getLayers();
+								$pos = $otherSnow->getPosition();
+								if($layers > SnowLayer::MAX_LAYERS){
+									$world->setBlock($pos->up(), $b->setLayers($layers - SnowLayer::MAX_LAYERS));
+									$b->setLayers(SnowLayer::MAX_LAYERS);
+								}else{
+									$world->setBlock($pos, $b->setLayers($layers));
+								}
+							}
+						}
 						$world->setBlock($pos, $b);
 						if($block instanceof Water && $b->canWaterlogged($block)){
 							$world->setBlockLayer($pos, $block, 1);