PopulationUtils.php

<?php
 
/*
 *
 *  ____            _        _   __  __ _                  __  __ ____
 * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
 * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
 * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
 * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * @author PocketMine Team
 * @link http://www.pocketmine.net/
 *
 *
 */
 
declare(strict_types=1);
 
namespace pocketmine\world\generator;
 
use pocketmine\utils\AssumptionFailedError;
use pocketmine\world\format\Chunk;
use pocketmine\world\SimpleChunkManager;
use pocketmine\world\World;
 
final class PopulationUtils{
 
    private static function setOrGenerateChunk(SimpleChunkManager $manager, Generator $generator, int $chunkX, int $chunkZ, ?Chunk $chunk) : Chunk{
        $manager->setChunk($chunkX, $chunkZ, $chunk ?? new Chunk([], false));
        if($chunk === null){
            $generator->generateChunk($manager, $chunkX, $chunkZ);
            $chunk = $manager->getChunk($chunkX, $chunkZ);
            if($chunk === null){
                throw new AssumptionFailedError("We just set this chunk, so it must exist");
            }
        }
        return $chunk;
    }
 
    public static function populateChunkWithAdjacents(int $minY, int $maxY, Generator $generator, int $chunkX, int $chunkZ, ?Chunk $centerChunk, array $adjacentChunks) : array{
        $manager = new SimpleChunkManager($minY, $maxY);
        self::setOrGenerateChunk($manager, $generator, $chunkX, $chunkZ, $centerChunk);
 
        $resultChunks = []; //this is just to keep phpstan's type inference happy
        foreach($adjacentChunks as $relativeChunkHash => $c){
            World::getXZ($relativeChunkHash, $relativeX, $relativeZ);
            $resultChunks[$relativeChunkHash] = self::setOrGenerateChunk($manager, $generator, $chunkX + $relativeX, $chunkZ + $relativeZ, $c);
        }
        $adjacentChunks = $resultChunks;
 
        $generator->populateChunk($manager, $chunkX, $chunkZ);
        $centerChunk = $manager->getChunk($chunkX, $chunkZ);
        if($centerChunk === null){
            throw new AssumptionFailedError("We just generated this chunk, so it must exist");
        }
        $centerChunk->setPopulated();
        return [$centerChunk, $adjacentChunks];
    }
}