Mutable registry

src/main/java/ru/betterend/world/biome/BiomeDefinition.java

@@ -51,6 +51,7 @@ public class BiomeDefinition {
 	private float fogDensity = 1F;
 
 	private final Identifier id;
+	private float genChance = 1F;
 	
 	private ConfiguredSurfaceBuilder<?> surface;
 
@@ -86,6 +87,11 @@ public class BiomeDefinition {
 		this.particleConfig = config;
 		return this;
 	}
+	
+	public BiomeDefinition setGenChance(float genChance) {
+		this.genChance = genChance;
+		return this;
+	}
 
 	public BiomeDefinition addMobSpawn(EntityType<?> type, int weight, int minGroupSize, int maxGroupSize) {
 		Identifier eID = Registry.ENTITY_TYPE.getId(type);
@@ -223,4 +229,8 @@ public class BiomeDefinition {
 	public float getFodDensity() {
 		return fogDensity;
 	}
+
+	public float getGenChance() {
+		return genChance;
+	}
 }

src/main/java/ru/betterend/world/biome/EndBiome.java

@@ -21,6 +21,7 @@ public class EndBiome {
 
 	protected EndBiome biomeParent;
 	protected float maxSubBiomeChance = 1;
+	protected final float genChanceUnmutable;
 	protected float genChance = 1;
 
 	private final float fogDensity;
@@ -29,12 +30,14 @@ public class EndBiome {
 		biome = definition.build();
 		mcID = definition.getID();
 		fogDensity = definition.getFodDensity();
+		genChanceUnmutable = definition.getGenChance();
 	}
 
 	public EndBiome(Biome biome) {
 		this.biome = biome;
 		mcID = BuiltinRegistries.BIOME.getId(biome);
 		fogDensity = 1;
+		genChanceUnmutable = 1;
 	}
 
 	public void genSurfColumn(WorldAccess world, BlockPos pos, Random random) {
@@ -106,6 +109,7 @@ public class EndBiome {
 	}
 
 	public float setGenChance(float chance) {
+		genChance = genChanceUnmutable;
 		genChance += chance;
 		return genChance;
 	}

src/main/java/ru/betterend/world/generator/BiomePicker.java

@@ -10,11 +10,26 @@ import ru.betterend.world.biome.EndBiome;
 
 public class BiomePicker {
 	private final List<EndBiome> biomes = Lists.newArrayList();
+	private float maxChanceUnmutable = 0;
 	private float maxChance = 0;
+	private int biomeCount = 0;
 	
 	public void addBiome(EndBiome biome) {
 		biomes.add(biome);
 		maxChance = biome.setGenChance(maxChance);
+		biomeCount ++;
+		maxChanceUnmutable = maxChance;
+	}
+	
+	public void addBiomeMutable(EndBiome biome) {
+		biomes.add(biome);
+		maxChance = biome.setGenChance(maxChance);
+	}
+	
+	public void clearMutables() {
+		maxChance = maxChanceUnmutable;
+		for (int i = biomes.size() - 1; i >= biomeCount; i--)
+			biomes.remove(i);
 	}
 	
 	public EndBiome getBiome(Random random) {