From 190f8e3c62f4ecb205ec24cfab0a9cff8e44c3c9 Mon Sep 17 00:00:00 2001
From: Timo Ley <timo.ley@tilera.dev>
Date: Tue, 17 Jan 2023 09:25:09 +0100
Subject: [PATCH] feat: option to enable farlands

---
 build.gradle                                  |  2 +-
 src/main/java/dev/tilera/cwg/Config.java      |  2 +
 .../mixins/MixinNoiseGeneratorOctaves.java    | 63 +++++++++++++++++++
 src/main/resources/cwg.mixins.json            |  4 +-
 4 files changed, 69 insertions(+), 2 deletions(-)
 create mode 100644 src/main/java/dev/tilera/cwg/mixins/MixinNoiseGeneratorOctaves.java

diff --git a/build.gradle b/build.gradle
index d7e4aa9..14e6e59 100644
--- a/build.gradle
+++ b/build.gradle
@@ -24,7 +24,7 @@ apply from: './gradle/scripts/mixins.gradle'
 sourceCompatibility = JavaVersion.VERSION_1_8
 targetCompatibility = JavaVersion.VERSION_1_8
 
-version = "1.4.0"
+version = "1.5.0"
 group= "dev.tilera.modding"
 archivesBaseName = "cwg"
 
diff --git a/src/main/java/dev/tilera/cwg/Config.java b/src/main/java/dev/tilera/cwg/Config.java
index 90bef30..d29e139 100644
--- a/src/main/java/dev/tilera/cwg/Config.java
+++ b/src/main/java/dev/tilera/cwg/Config.java
@@ -15,6 +15,7 @@ public class Config {
     public static boolean disableNewFlowers = false;
     public static boolean classicExtremeHills = false;
     public static boolean disableHeightTemperature = false;
+    public static boolean enableFarlands = false;
 
     public static void initConfig() {
         conf = new Configuration(new File(Loader.instance().getConfigDir(), "ClassicWorldgen.cfg"));
@@ -26,6 +27,7 @@ public class Config {
         classicExtremeHills = conf.getBoolean("classicExtremeHills", "tweaks", classicExtremeHills, "generate 1.6 extreme hills instead of 1.7");
         disableHeightTemperature = conf.getBoolean("disableHeightTemperature", "tweaks", disableHeightTemperature, "disable snow on mountains");
         changeWorldTypeCommand = conf.getBoolean("changeTypeCommand", "commands", changeWorldTypeCommand, "enable command to change the WorldType");
+        enableFarlands = conf.getBoolean("enableFarlands", "tweaks", enableFarlands, "reenable the Farlands!");
         conf.save();
     }
 
diff --git a/src/main/java/dev/tilera/cwg/mixins/MixinNoiseGeneratorOctaves.java b/src/main/java/dev/tilera/cwg/mixins/MixinNoiseGeneratorOctaves.java
new file mode 100644
index 0000000..34df8f3
--- /dev/null
+++ b/src/main/java/dev/tilera/cwg/mixins/MixinNoiseGeneratorOctaves.java
@@ -0,0 +1,63 @@
+package dev.tilera.cwg.mixins;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+import org.spongepowered.asm.mixin.Shadow;
+
+import dev.tilera.cwg.Config;
+import net.minecraft.util.MathHelper;
+import net.minecraft.world.gen.NoiseGenerator;
+import net.minecraft.world.gen.NoiseGeneratorImproved;
+import net.minecraft.world.gen.NoiseGeneratorOctaves;
+
+@Mixin(NoiseGeneratorOctaves.class)
+public abstract class MixinNoiseGeneratorOctaves extends NoiseGenerator {
+    
+    @Shadow
+    private NoiseGeneratorImproved[] generatorCollection;
+    @Shadow
+    private int octaves;
+
+    /**
+     * @author tilera
+     * @reason farlands 
+     */
+    @Overwrite
+    public double[] generateNoiseOctaves(double[] p_76304_1_, int p_76304_2_, int p_76304_3_, int p_76304_4_, int p_76304_5_, int p_76304_6_, int p_76304_7_, double p_76304_8_, double p_76304_10_, double p_76304_12_) {
+        if (p_76304_1_ == null)
+        {
+            p_76304_1_ = new double[p_76304_5_ * p_76304_6_ * p_76304_7_];
+        }
+        else
+        {
+            for (int k1 = 0; k1 < p_76304_1_.length; ++k1)
+            {
+                p_76304_1_[k1] = 0.0D;
+            }
+        }
+
+        double d6 = 1.0D;
+
+        for (int l1 = 0; l1 < this.octaves; ++l1)
+        {
+            double d3 = (double)p_76304_2_ * d6 * p_76304_8_;
+            double d4 = (double)p_76304_3_ * d6 * p_76304_10_;
+            double d5 = (double)p_76304_4_ * d6 * p_76304_12_;
+            long i2 = MathHelper.floor_double_long(d3);
+            long j2 = MathHelper.floor_double_long(d5);
+            d3 -= (double)i2;
+            d5 -= (double)j2;
+            if (!Config.enableFarlands) {
+                i2 %= 16777216L;
+                j2 %= 16777216L;
+            }
+            d3 += (double)i2;
+            d5 += (double)j2;
+            this.generatorCollection[l1].populateNoiseArray(p_76304_1_, d3, d4, d5, p_76304_5_, p_76304_6_, p_76304_7_, p_76304_8_ * d6, p_76304_10_ * d6, p_76304_12_ * d6, d6);
+            d6 /= 2.0D;
+        }
+
+        return p_76304_1_;
+    }
+
+}
diff --git a/src/main/resources/cwg.mixins.json b/src/main/resources/cwg.mixins.json
index bd42d91..57ae14e 100644
--- a/src/main/resources/cwg.mixins.json
+++ b/src/main/resources/cwg.mixins.json
@@ -9,7 +9,9 @@
       "MixinBiomeGenHills", 
       "MixinBiomeGenPlains", 
       "MixinBiomeGenSwamp", 
-      "MixinGenDoublePlant"],
+      "MixinGenDoublePlant",
+      "MixinNoiseGeneratorOctaves"
+    ],
     "injectors": {
       "defaultRequire": 1
     }