From 792b5e2e4ac24d77a8c770f9ec7581ffe6120df0 Mon Sep 17 00:00:00 2001
From: Cheeserolls <dan@fullgun.com>
Date: Thu, 18 Jun 2015 03:02:51 +0100
Subject: [PATCH] De-obfuscate GenLayerRiver - unused at the moment, but
 considering using this to implement riverside biomes

---
 .../common/world/layer/GenLayerBOPRiver.java  | 53 +++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 src/main/java/biomesoplenty/common/world/layer/GenLayerBOPRiver.java

diff --git a/src/main/java/biomesoplenty/common/world/layer/GenLayerBOPRiver.java b/src/main/java/biomesoplenty/common/world/layer/GenLayerBOPRiver.java
new file mode 100644
index 000000000..6308948c2
--- /dev/null
+++ b/src/main/java/biomesoplenty/common/world/layer/GenLayerBOPRiver.java
@@ -0,0 +1,53 @@
+package biomesoplenty.common.world.layer;
+
+import net.minecraft.world.biome.BiomeGenBase;
+import net.minecraft.world.gen.layer.GenLayer;
+import net.minecraft.world.gen.layer.IntCache;
+
+public class GenLayerBOPRiver extends GenLayer
+{
+    public GenLayerBOPRiver(long p_i2128_1_, GenLayer p_i2128_3_)
+    {
+        super(p_i2128_1_);
+        super.parent = p_i2128_3_;
+    }
+
+    @Override
+    public int[] getInts(int areaX, int areaY, int areaWidth, int areaHeight)
+    {
+        int areaX_ = areaX - 1;
+        int areaY_ = areaY - 1;
+        int areaWidth_ = areaWidth + 2;
+        int areaHeight_ = areaHeight + 2;
+        int[] parentVals = this.parent.getInts(areaX_, areaY_, areaWidth_, areaHeight_);
+        int[] out = IntCache.getIntCache(areaWidth * areaHeight);
+
+        for (int y = 0; y < areaHeight; ++y)
+        {
+            for (int x = 0; x < areaWidth; ++x)
+            {
+                int westVal = this.mod2(parentVals[x + 0 + (y + 1) * areaWidth_]);
+                int eastVal = this.mod2(parentVals[x + 2 + (y + 1) * areaWidth_]);
+                int northVal = this.mod2(parentVals[x + 1 + (y + 0) * areaWidth_]);
+                int southVal = this.mod2(parentVals[x + 1 + (y + 2) * areaWidth_]);
+                int val = this.mod2(parentVals[x + 1 + (y + 1) * areaWidth_]);
+
+                if (val == westVal && val == northVal && val == eastVal && val == southVal)
+                {
+                    out[x + y * areaWidth] = -1;
+                }
+                else
+                {
+                    out[x + y * areaWidth] = BiomeGenBase.river.biomeID;
+                }
+            }
+        }
+
+        return out;
+    }
+
+    private int mod2(int a)
+    {
+        return a >= 2 ? 2 + (a & 1) : a;
+    }
+}
\ No newline at end of file