MinecraftConsoles/Minecraft.World/ClimateLayer.cpp

#include "stdafx.h"
#include "ClimateLayer.h"
#include "Random.h"
#include "Mth.h"
#include "IntCache.h"

ClimateLayer::ClimateLayer(int64_t seed, int octaves, double scale, shared_ptr<Layer> parent)
    : Layer(seed), scale(scale)
{
    this->parent = parent;
    Random random(seed);
    temperatureNoise = new PerlinNoise(&random, octaves);
    humidityNoise = new PerlinNoise(&random, octaves);
    initBiomeCenters();
}

ClimateLayer::~ClimateLayer()
{
    delete temperatureNoise;
    delete humidityNoise;
}

void ClimateLayer::initBiomeCenters()
{
    // Çàäà¸ì öåíòðû îñíîâíûõ áèîìîâ â ïðîñòðàíñòâå (òåìïåðàòóðà, âëàæíîñòü)
    // Çíà÷åíèÿ ïîäîáðàíû íà îñíîâå setTemperatureAndDownfall() èç Biome.cpp
    centers.push_back({ 0.00f, 0.25f, Biome::iceFlats });          // õîëîäíûå ðàâíèíû
    centers.push_back({ 0.10f, 0.80f, Biome::taiga });             // òàéãà
    centers.push_back({ 0.30f, 0.30f, Biome::extremeHills });      // ýêñòðåìàëüíûå õîëìû
    centers.push_back({ 0.70f, 0.40f, Biome::plains });            // ðàâíèíû
    centers.push_back({ 0.70f, 0.70f, Biome::forest });            // ëåñ
    centers.push_back({ 0.80f, 0.95f, Biome::swampland });         // áîëîòî
    centers.push_back({ 0.95f, 0.05f, Biome::desert });            // ïóñòûíÿ
    centers.push_back({ 0.95f, 0.85f, Biome::jungle });            // äæóíãëè

    // Ïðèìå÷àíèå: îêåàíè÷åñêèå áèîìû íå âêëþ÷åíû — îíè áóäóò îïðåäåëÿòüñÿ ïî âûñîòå îòäåëüíî.
    // Õîëìèñòûå âàðèàíòû (desertHills, forestHills è ò.ä.) ìîæíî äîáàâèòü ïîçæå,
    // èñïîëüçóÿ äîïîëíèòåëüíûé øóì âûñîòû èëè âòîðîé ïðîõîä.
}

Biome* ClimateLayer::getBiomeForClimate(float temp, float hum) const
{
    float bestDist = 1e9f;
    Biome* bestBiome = Biome::plains; // çàïàñíîé âàðèàíò

    for (const auto& c : centers) {
        float dx = temp - c.temp;
        float dy = hum - c.hum;
        float dist = dx * dx + dy * dy;   // êâàäðàò åâêëèäîâà ðàññòîÿíèÿ
        if (dist < bestDist) {
            bestDist = dist;
            bestBiome = c.biome;
        }
    }
    return bestBiome;
}

intArray ClimateLayer::getArea(int xo, int yo, int w, int h)
{
    IntCache::releaseAll();
    intArray result = IntCache::allocate(w * h);
    intArray parentMap = parent->getArea(xo, yo, w, h); // ïîëó÷àåì êàðòó ñóøè/îêåàíà

    for (int y = 0; y < h; ++y) {
        for (int x = 0; x < w; ++x) {
            int parentVal = parentMap[x + y * w];
            if (parentVal == 0) { // îêåàí
                result[x + y * w] = 0;
                continue;
            }

            int worldX = xo + x;
            int worldY = yo + y;

            double tempNoise = temperatureNoise->getValue(worldX * scale, worldY * scale);
            double humNoise = humidityNoise->getValue(worldX * scale, worldY * scale);

            float normTemp = Mth::clamp((float)((tempNoise + 1.0) * 0.5), 0.0f, 1.0f);
            float normHum = Mth::clamp((float)((humNoise + 1.0) * 0.5), 0.0f, 1.0f);

            Biome* biome = getBiomeForClimate(normTemp, normHum);
            result[x + y * w] = biome->id;
        }
    }
    return result;
}