basic framework

common/src/main/java/com/dfsek/terra/api/math/MathUtil.java

@@ -91,6 +91,10 @@ public final class MathUtil {
         return Math.sqrt(((xVal2 - xVal1) * (xVal2 - xVal1)) + ((zVal2 - zVal1) * (zVal2 - zVal1)) + ((yVal2 - yVal1) * (yVal2 - yVal1)));
     }
 
+    public static int normalizeIndex(double val, int size) {
+        return FastMath.max(FastMath.min(FastMath.floorToInt(((val + 1D) / 2D) * size), size - 1), 0);
+    }
+
     public static long squash(int first, int last) {
         return (((long) first) << 32) | (last & 0xffffffffL);
     }

common/src/main/java/com/dfsek/terra/api/math/ProbabilityCollection.java

@@ -1,7 +1,6 @@
 package com.dfsek.terra.api.math;
 
 import com.dfsek.terra.api.math.noise.samplers.NoiseSampler;
-import net.jafama.FastMath;
 
 import java.util.HashSet;
 import java.util.Random;
@@ -29,24 +28,14 @@ public class ProbabilityCollection<E> {
         return (E) array[r.nextInt(array.length)];
     }
 
-    private static double getNoise(double x, double y, double z, NoiseSampler sampler) {
-        double n = sampler.getNoise(x, y, z);
-        return FastMath.min(FastMath.max(n, -1), 1);
-    }
-
-    private static double getNoise(double x, double z, NoiseSampler sampler) {
-        double n = sampler.getNoise(x, z);
-        return FastMath.min(FastMath.max(n, -1), 1);
-    }
-
     public E get(NoiseSampler n, double x, double y, double z) {
         if(array.length == 0) return null;
-        return (E) array[FastMath.min(FastMath.floorToInt(((getNoise(x, y, z, n) + 1D) / 2D) * array.length), array.length - 1)];
+        return (E) array[MathUtil.normalizeIndex(n.getNoise(x, y, z), array.length)];
     }
 
     public E get(NoiseSampler n, double x, double z) {
         if(array.length == 0) return null;
-        return (E) array[FastMath.min(FastMath.floorToInt(((getNoise(x, z, n) + 1D) / 2D) * array.length), array.length - 1)];
+        return (E) array[MathUtil.normalizeIndex(n.getNoise(x, z), array.length)];
     }
 
     public int getTotalProbability() {

common/src/main/java/com/dfsek/terra/api/world/biome/Biome.java

@@ -22,4 +22,6 @@ public interface Biome {
      * @return BiomeTerrain - The terrain generation instance.
      */
     Generator getGenerator(World w);
+
+    int getColor();
 }