first commit

Minecraft.World/RiverLayer.cpp

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+#include "stdafx.h"
+#include "net.minecraft.world.level.biome.h"
+#include "net.minecraft.world.level.newbiome.layer.h"
+
+RiverLayer::RiverLayer(__int64 seedMixup, shared_ptr<Layer>parent) : Layer(seedMixup)
+{
+	this->parent = parent;
+}
+
+intArray RiverLayer::getArea(int xo, int yo, int w, int h)
+{
+	int px = xo - 1;
+	int py = yo - 1;
+	int pw = w + 2;
+	int ph = h + 2;
+	intArray p = parent->getArea(px, py, pw, ph);
+
+	intArray result = IntCache::allocate(w * h);
+	for (int y = 0; y < h; y++)
+	{
+		for (int x = 0; x < w; x++)
+		{
+			int l = p[(x + 0) + (y + 1) * pw];
+			int r = p[(x + 2) + (y + 1) * pw];
+			int u = p[(x + 1) + (y + 0) * pw];
+			int d = p[(x + 1) + (y + 2) * pw];
+			int c = p[(x + 1) + (y + 1) * pw];
+			if (c == 0 || (l == 0 || r == 0 || u == 0 || d == 0) || c != l || c != u || c != r || c != d)
+			{
+				result[x + y * w] = Biome::river->id;
+			}
+			else
+			{
+				result[x + y * w] = -1;
+			}
+		}
+	}
+
+	return result;
+}