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78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
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#include "minecraft/world/level/newbiome/layer/FuzzyZoomLayer.h"
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#include <stdint.h>
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#include <algorithm>
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#include <memory>
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#include <vector>
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#include "minecraft/world/level/newbiome/layer/Layer.h"
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FuzzyZoomLayer::FuzzyZoomLayer(int64_t seedMixup, std::shared_ptr<Layer> parent)
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: Layer(seedMixup) {
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this->parent = parent;
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}
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std::vector<int> FuzzyZoomLayer::getArea(int xo, int yo, int w, int h) {
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int px = xo >> 1;
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int py = yo >> 1;
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int pw = (w >> 1) + 3;
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int ph = (h >> 1) + 3;
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std::vector<int> p = parent->getArea(px, py, pw, ph);
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// 4jcraft added casts to unsigned to prevent shift of neg value
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std::vector<int> tmp(pw * ph * 4);
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int ww = ((unsigned int)pw << 1);
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for (int y = 0; y < ph - 1; y++) {
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int ry = (unsigned int)y << 1;
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int pp = ry * ww;
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int ul = p[(0 + 0) + (y + 0) * pw];
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int dl = p[(0 + 0) + (y + 1) * pw];
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for (int x = 0; x < pw - 1; x++) {
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initRandom((unsigned int)(x + px) << 1, (unsigned int)(y + py)
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<< 1);
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int ur = p[(x + 1) + (y + 0) * pw];
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int dr = p[(x + 1) + (y + 1) * pw];
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tmp[pp] = ul;
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tmp[pp++ + ww] = random(ul, dl);
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tmp[pp] = random(ul, ur);
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tmp[pp++ + ww] = random(ul, ur, dl, dr);
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ul = ur;
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dl = dr;
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}
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}
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std::vector<int> result(w * h);
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for (int y = 0; y < h; y++) {
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std::copy(
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tmp.begin() + (y + (yo & 1)) * ((unsigned int)pw << 1) + (xo & 1),
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tmp.begin() + (y + (yo & 1)) * ((unsigned int)pw << 1) + (xo & 1) +
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w,
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result.begin() + y * w);
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}
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return result;
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}
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int FuzzyZoomLayer::random(int a, int b) { return nextRandom(2) == 0 ? a : b; }
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int FuzzyZoomLayer::random(int a, int b, int c, int d) {
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int s = nextRandom(4);
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if (s == 0) return a;
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if (s == 1) return b;
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if (s == 2) return c;
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return d;
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}
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std::shared_ptr<Layer> FuzzyZoomLayer::zoom(int64_t seed,
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std::shared_ptr<Layer> sup,
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int count) {
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std::shared_ptr<Layer> result = sup;
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for (int i = 0; i < count; i++) {
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result = std::make_shared<FuzzyZoomLayer>(seed + i, result);
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}
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return result;
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}
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