4jcraft/targets/minecraft/world/level/newbiome/layer/RegionHillsLayer.cpp

#include "RegionHillsLayer.h"

#include <vector>

#include "minecraft/world/level/biome/Biome.h"
#include "minecraft/world/level/newbiome/layer/Layer.h"

RegionHillsLayer::RegionHillsLayer(int64_t seed, std::shared_ptr<Layer> parent)
    : Layer(seed) {
    this->parent = parent;
}

std::vector<int> RegionHillsLayer::getArea(int xo, int yo, int w, int h) {
    std::vector<int> b = parent->getArea(xo - 1, yo - 1, w + 2, h + 2);

    std::vector<int> result(w * h);
    for (int y = 0; y < h; y++) {
        for (int x = 0; x < w; x++) {
            initRandom(x + xo, y + yo);
            int old = b[(x + 1) + (y + 1) * (w + 2)];
            if (nextRandom(3) == 0) {
                int next = old;
                if (old == Biome::desert->id) {
                    next = Biome::desertHills->id;
                } else if (old == Biome::forest->id) {
                    next = Biome::forestHills->id;
                } else if (old == Biome::taiga->id) {
                    next = Biome::taigaHills->id;
                } else if (old == Biome::plains->id) {
                    next = Biome::forest->id;
                } else if (old == Biome::iceFlats->id) {
                    next = Biome::iceMountains->id;
                } else if (old == Biome::jungle->id) {
                    next = Biome::jungleHills->id;
                }
                if (next == old) {
                    result[x + y * w] = old;
                } else {
                    int _n = b[(x + 1) + (y + 1 - 1) * (w + 2)];
                    int _e = b[(x + 1 + 1) + (y + 1) * (w + 2)];
                    int _w = b[(x + 1 - 1) + (y + 1) * (w + 2)];
                    int _s = b[(x + 1) + (y + 1 + 1) * (w + 2)];
                    if (_n == old && _e == old && _w == old && _s == old) {
                        result[x + y * w] = next;
                    } else {
                        result[x + y * w] = old;
                    }
                }
            } else {
                result[x + y * w] = old;
            }
        }
    }

    return result;
}