BiomeSelector.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\biome;
 
use pocketmine\utils\Random;
use pocketmine\world\biome\Biome;
use pocketmine\world\biome\BiomeRegistry;
use pocketmine\world\biome\UnknownBiome;
use pocketmine\world\generator\noise\Simplex;
 
abstract class BiomeSelector{
    private Simplex $temperature;
    private Simplex $rainfall;
 
    private \SplFixedArray $map;
 
    public function __construct(Random $random){
        $this->temperature = new Simplex($random, 2, 1 / 16, 1 / 512);
        $this->rainfall = new Simplex($random, 2, 1 / 16, 1 / 512);
    }
 
    abstract protected function lookup(float $temperature, float $rainfall) : int;
 
    public function recalculate() : void{
        $this->map = new \SplFixedArray(64 * 64);
 
        $biomeRegistry = BiomeRegistry::getInstance();
        for($i = 0; $i < 64; ++$i){
            for($j = 0; $j < 64; ++$j){
                $biome = $biomeRegistry->getBiome($this->lookup($i / 63, $j / 63));
                if($biome instanceof UnknownBiome){
                    throw new \RuntimeException("Unknown biome returned by selector with ID " . $biome->getId());
                }
                $this->map[$i + ($j << 6)] = $biome;
            }
        }
    }
 
    public function getTemperature(float $x, float $z) : float{
        return ($this->temperature->noise2D($x, $z, true) + 1) / 2;
    }
 
    public function getRainfall(float $x, float $z) : float{
        return ($this->rainfall->noise2D($x, $z, true) + 1) / 2;
    }
 
    public function pickBiome(float $x, float $z) : Biome{
        $temperature = (int) ($this->getTemperature($x, $z) * 63);
        $rainfall = (int) ($this->getRainfall($x, $z) * 63);
 
        return $this->map[$temperature + ($rainfall << 6)];
    }
}