basic framework

common/src/main/java/com/dfsek/terra/biome/UserDefinedBiome.java

@@ -17,6 +17,7 @@ public class UserDefinedBiome implements Biome {
     private final BiomeTemplate config;
     private final ConfigPack pack;
     private UserDefinedBiome erode;
+    private int color;
 
 
     public UserDefinedBiome(com.dfsek.terra.api.platform.world.Biome vanilla, GeneratorBuilder gen, BiomeTemplate config, ConfigPack pack) {
@@ -25,6 +26,7 @@ public class UserDefinedBiome implements Biome {
         this.id = config.getID();
         this.config = config;
         this.pack = pack;
+        this.color = config.getColor();
     }
 
     /**
@@ -58,4 +60,9 @@ public class UserDefinedBiome implements Biome {
     public Generator getGenerator(World w) {
         return gen.build(w.getSeed());
     }
+
+    @Override
+    public int getColor() {
+        return color;
+    }
 }

common/src/main/java/com/dfsek/terra/biome/pipeline/BiomeHolder.java

@@ -0,0 +1,16 @@
+package com.dfsek.terra.biome.pipeline;
+
+import com.dfsek.terra.api.world.biome.Biome;
+import com.dfsek.terra.biome.pipeline.expand.BiomeExpander;
+import com.dfsek.terra.biome.pipeline.mutator.BiomeMutator;
+import com.dfsek.terra.biome.pipeline.source.BiomeSource;
+
+public interface BiomeHolder {
+    void expand(BiomeExpander expander);
+
+    void mutate(BiomeMutator mutator);
+
+    void fill(BiomeSource source);
+
+    Biome getBiome(int x, int z);
+}

common/src/main/java/com/dfsek/terra/biome/pipeline/Position.java

@@ -0,0 +1,25 @@
+package com.dfsek.terra.biome.pipeline;
+
+import com.dfsek.terra.api.math.vector.Vector2;
+
+public class Position {
+    private final int x;
+    private final int y;
+
+    public Position(int x, int y) {
+        this.x = x;
+        this.y = y;
+    }
+
+    public int getX() {
+        return x;
+    }
+
+    public int getY() {
+        return y;
+    }
+
+    public Vector2 getAsVector() {
+        return new Vector2(x, y);
+    }
+}

common/src/main/java/com/dfsek/terra/biome/pipeline/TerraBiomeHolder.java

@@ -0,0 +1,57 @@
+package com.dfsek.terra.biome.pipeline;
+
+import com.dfsek.terra.api.world.biome.Biome;
+import com.dfsek.terra.biome.pipeline.expand.BiomeExpander;
+import com.dfsek.terra.biome.pipeline.mutator.BiomeMutator;
+import com.dfsek.terra.biome.pipeline.source.BiomeSource;
+
+public class TerraBiomeHolder implements BiomeHolder {
+    private final Position original;
+    private int width;
+    private Biome[][] biomes;
+
+    public TerraBiomeHolder(int width, Position original) {
+        this.width = width;
+        biomes = new Biome[width][width];
+        this.original = original;
+    }
+
+    @Override
+    public void expand(BiomeExpander expander) {
+        Biome[][] old = biomes;
+        int oldWidth = width;
+
+        width = 2 * width - 1;
+
+        biomes = new Biome[width][width];
+        for(int x = 0; x < oldWidth; x++) {
+            for(int z = 0; z < oldWidth; z++) {
+                biomes[x * 2][z * 2] = old[x][z];
+                if(z != oldWidth - 1) biomes[x * 2][z * 2 + 1] = expander.getBetween(new Position(x, z + 1), old[x][z], old[x][z + 1]);
+                if(x != oldWidth - 1) biomes[x * 2 + 1][z * 2] = expander.getBetween(new Position(x + 1, z), old[x][z], old[x + 1][z]);
+                if(x != oldWidth - 1 && z != oldWidth - 1)
+                    biomes[x * 2 + 1][z * 2 + 1] = expander.getBetween(new Position(x + 1, z + 1), old[x][z], old[x + 1][z + 1]);
+            }
+        }
+
+    }
+
+    @Override
+    public void mutate(BiomeMutator mutator) {
+
+    }
+
+    @Override
+    public void fill(BiomeSource source) {
+        for(int x = 0; x < width; x++) {
+            for(int z = 0; z < width; z++) {
+                biomes[x][z] = source.getBiome(original.getX() + x, original.getY() + z);
+            }
+        }
+    }
+
+    @Override
+    public Biome getBiome(int x, int z) {
+        return biomes[x][z];
+    }
+}

common/src/main/java/com/dfsek/terra/biome/pipeline/expand/BiomeExpander.java

@@ -0,0 +1,8 @@
+package com.dfsek.terra.biome.pipeline.expand;
+
+import com.dfsek.terra.api.world.biome.Biome;
+import com.dfsek.terra.biome.pipeline.Position;
+
+public interface BiomeExpander {
+    Biome getBetween(Position center, Biome... others);
+}

common/src/main/java/com/dfsek/terra/biome/pipeline/expand/FractalExpander.java

@@ -0,0 +1,19 @@
+package com.dfsek.terra.biome.pipeline.expand;
+
+import com.dfsek.terra.api.math.MathUtil;
+import com.dfsek.terra.api.math.noise.samplers.NoiseSampler;
+import com.dfsek.terra.api.world.biome.Biome;
+import com.dfsek.terra.biome.pipeline.Position;
+
+public class FractalExpander implements BiomeExpander {
+    private final NoiseSampler sampler;
+
+    public FractalExpander(NoiseSampler sampler) {
+        this.sampler = sampler;
+    }
+
+    @Override
+    public Biome getBetween(Position center, Biome... others) {
+        return others[MathUtil.normalizeIndex(sampler.getNoise(center.getAsVector()), others.length)];
+    }
+}

common/src/main/java/com/dfsek/terra/biome/pipeline/mutator/BiomeMutator.java

@@ -0,0 +1,4 @@
+package com.dfsek.terra.biome.pipeline.mutator;
+
+public interface BiomeMutator {
+}

common/src/main/java/com/dfsek/terra/biome/pipeline/source/BiomeSource.java

@@ -0,0 +1,7 @@
+package com.dfsek.terra.biome.pipeline.source;
+
+import com.dfsek.terra.api.world.biome.Biome;
+
+public interface BiomeSource {
+    Biome getBiome(int x, int z);
+}

common/src/main/java/com/dfsek/terra/biome/pipeline/source/RandomSource.java

@@ -0,0 +1,20 @@
+package com.dfsek.terra.biome.pipeline.source;
+
+import com.dfsek.terra.api.math.ProbabilityCollection;
+import com.dfsek.terra.api.math.noise.samplers.NoiseSampler;
+import com.dfsek.terra.api.world.biome.Biome;
+
+public class RandomSource implements BiomeSource {
+    private final ProbabilityCollection<Biome> biomes;
+    private final NoiseSampler sampler;
+
+    public RandomSource(ProbabilityCollection<Biome> biomes, NoiseSampler sampler) {
+        this.biomes = biomes;
+        this.sampler = sampler;
+    }
+
+    @Override
+    public Biome getBiome(int x, int z) {
+        return biomes.get(sampler, x, z);
+    }
+}