From b691c43c44ff180d10e7d4a9afc83b98551ff586 Mon Sep 17 00:00:00 2001
From: daoge_cmd <3523206925@qq.com>
Date: Sun, 1 Mar 2026 12:16:08 +0800
Subject: Initial commit

---
 Minecraft.World/RiverMixerLayer.cpp | 47 +++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 Minecraft.World/RiverMixerLayer.cpp

(limited to 'Minecraft.World/RiverMixerLayer.cpp')

diff --git a/Minecraft.World/RiverMixerLayer.cpp b/Minecraft.World/RiverMixerLayer.cpp
new file mode 100644
index 00000000..62dfdd6c
--- /dev/null
+++ b/Minecraft.World/RiverMixerLayer.cpp
@@ -0,0 +1,47 @@
+#include "stdafx.h"
+#include "net.minecraft.world.level.biome.h"
+#include "net.minecraft.world.level.newbiome.layer.h"
+
+RiverMixerLayer::RiverMixerLayer(__int64 seed, shared_ptr<Layer>biomes, shared_ptr<Layer>rivers) : Layer(seed)
+{
+	this->biomes = biomes;
+	this->rivers = rivers;
+}
+
+void RiverMixerLayer::init(__int64 seed)
+{
+	biomes->init(seed);
+	rivers->init(seed);
+	Layer::init(seed);
+}
+
+intArray RiverMixerLayer::getArea(int xo, int yo, int w, int h)
+{
+	intArray b = biomes->getArea(xo, yo, w, h);
+	intArray r = rivers->getArea(xo, yo, w, h);
+
+	intArray result = IntCache::allocate(w * h);
+	for (int i = 0; i < w * h; i++)
+	{
+		if (b[i] == Biome::ocean->id)
+		{
+			result[i] = b[i];
+
+		}
+		else
+		{
+			if (r[i] >= 0)
+			{
+				if (b[i] == Biome::iceFlats->id) result[i] = Biome::frozenRiver->id;
+				else if (b[i] == Biome::mushroomIsland->id || b[i] == Biome::mushroomIslandShore->id) result[i] = Biome::mushroomIsland->id;		// 4J - don't make mushroom island shores as we don't have any island left once we do this as our islands are small (this used to change to mushroomIslandShore)
+				else result[i] = r[i];
+			}
+			else
+			{
+				result[i] = b[i];
+			}
+		}
+	}
+
+	return result;
+}
\ No newline at end of file
-- 
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