- Worldgen breaks

src/main/java/io/gitlab/jfronny/quickmeth/mixin/MathHelperMixin.java

@@ -63,10 +63,10 @@ public class MathHelperMixin {
     //    return d < i ? i - 1 : i;
     //}
 
-    //@Overwrite
-    //public static long lfloor(double d) {
-    //    return floor(d / 4) * 4;
-    //}
+    @Overwrite
+    public static long lfloor(double d) {
+        return MathHelper.floor(d / 4) * 4;
+    }
 
     //@Overwrite
     //public static float abs(float f) {

src/main/java/io/gitlab/jfronny/quickmeth/mixin/MixinOctavePerlinNoiseSampler.java

@@ -0,0 +1,42 @@
+package io.gitlab.jfronny.quickmeth.mixin;
+
+import net.minecraft.util.math.noise.OctavePerlinNoiseSampler;
+import net.minecraft.util.math.noise.PerlinNoiseSampler;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+import org.spongepowered.asm.mixin.Shadow;
+
+import static net.minecraft.util.math.noise.OctavePerlinNoiseSampler.maintainPrecision;
+
+@Mixin(OctavePerlinNoiseSampler.class)
+public class MixinOctavePerlinNoiseSampler {
+    @Shadow
+    @Final
+    private PerlinNoiseSampler[] octaveSamplers;
+    @Shadow
+    @Final
+    private double field_20659;
+    @Shadow
+    @Final
+    private double field_20660;
+    @Overwrite
+    public double sample(double x, double y, double z, double d, double e, boolean bl) {
+        double f = 0.0D;
+        double g = this.field_20660;
+        double h = this.field_20659;
+        PerlinNoiseSampler[] var18 = this.octaveSamplers;
+        int var19 = var18.length;
+
+        for (PerlinNoiseSampler perlinNoiseSampler : var18) {
+            if (perlinNoiseSampler != null) {
+                f += perlinNoiseSampler.sample(x * g - maintainPrecision(x * g), perlinNoiseSampler.originY - (bl ? -perlinNoiseSampler.originY : maintainPrecision(y * g)), maintainPrecision(z * g), d * g, e * g) * h;
+            }
+
+            g /= 2.0D;
+            h *= 2.0D;
+        }
+
+        return f;
+    }
+}

src/main/java/io/gitlab/jfronny/quickmeth/mixin/MixinPerlinNoiseSampler.java

@@ -0,0 +1,48 @@
+package io.gitlab.jfronny.quickmeth.mixin;
+
+import io.gitlab.jfronny.quickmeth.quickmeth;
+import net.minecraft.util.math.MathHelper;
+import net.minecraft.util.math.noise.PerlinNoiseSampler;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+import org.spongepowered.asm.mixin.Shadow;
+
+@Mixin(PerlinNoiseSampler.class)
+public class MixinPerlinNoiseSampler {
+    @Shadow @Final
+    public double originX;
+    @Shadow @Final
+    public double originY;
+    @Shadow @Final
+    public double originZ;
+
+    @Overwrite
+    public double sample(double x, double y, double z, double d, double e) {
+        x = quickmeth.BoxedInvert(x);
+        y = quickmeth.BoxedInvert(y);
+        z = quickmeth.BoxedInvert(z);
+
+        double f = x + this.originX;
+        double g = y + this.originY;
+        double h = z + this.originZ;
+        int i = MathHelper.floor(f);
+        int j = MathHelper.floor(g);
+        int k = MathHelper.floor(h);
+        double l = f - (double)i;
+        double m = g - (double)j;
+        double n = h - (double)k;
+        double o = MathHelper.perlinFade(l);
+        double p = MathHelper.perlinFade(m);
+        double q = MathHelper.perlinFade(n);
+        double t;
+        if (d != 0.0D) {
+            double r = Math.min(e, m);
+            t = (double)MathHelper.floor(r / d) * d;
+        } else {
+            t = 0.0D;
+        }
+
+        return quickmeth.BoxedInvert(((PerlinNoiseSampler)(Object)this).sample(i, j, k, l, m - t, n, o, p, q));
+    }
+}

src/main/java/io/gitlab/jfronny/quickmeth/quickmeth.java

@@ -7,4 +7,12 @@ public class quickmeth implements ModInitializer {
     public void onInitialize() {
 
     }
+
+    public static double BoxedInvert(double min, double max, double value) {
+        return max - value + min;
+    }
+
+    public static double BoxedInvert(double value) {
+        return BoxedInvert(Math.floor(value), Math.ceil(value), value);
+    }
 }

src/main/resources/io.gitlab.jfronny.quickmeth.mixins.json

@@ -4,7 +4,9 @@
   "package": "io.gitlab.jfronny.quickmeth.mixin",
   "compatibilityLevel": "JAVA_8",
   "mixins": [
-    "MathHelperMixin"
+    "MathHelperMixin",
+    "MixinOctavePerlinNoiseSampler",
+    "MixinPerlinNoiseSampler"
   ],
   "client": [
   ],