basic noise carver implementation

common/src/main/java/com/dfsek/terra/config/builder/GeneratorBuilder.java

@@ -20,6 +20,8 @@ public class GeneratorBuilder {
 
     private String elevationEquation;
 
+    private String carvingEquation;
+
     private Scope varScope;
 
     private Map<String, NoiseBuilder> noiseBuilderMap;
@@ -51,13 +53,15 @@ public class GeneratorBuilder {
             return gens.computeIfAbsent(seed, k -> {
                 NoiseSampler noise;
                 NoiseSampler elevation;
+                NoiseSampler carving;
                 try {
                     noise = new ExpressionSampler(noiseEquation, varScope, seed, noiseBuilderMap);
                     elevation = elevationEquation == null ? new ConstantSampler(0) : new ExpressionSampler(elevationEquation, varScope, seed, noiseBuilderMap);
+                    carving = new ExpressionSampler(carvingEquation, varScope, seed, noiseBuilderMap);
                 } catch(ParseException e) {
                     throw new RuntimeException(e);
                 }
-                return new WorldGenerator(palettes, slantPalettes, noise, elevation, noise2d, base, biomeNoise.build((int) seed), elevationWeight, blendDistance, blendStep, blendWeight);
+                return new WorldGenerator(palettes, slantPalettes, noise, elevation, carving, noise2d, base, biomeNoise.build((int) seed), elevationWeight, blendDistance, blendStep, blendWeight);
             });
         }
     }
@@ -114,6 +118,10 @@ public class GeneratorBuilder {
         this.elevationEquation = elevationEquation;
     }
 
+    public void setCarvingEquation(String carvingEquation) {
+        this.carvingEquation = carvingEquation;
+    }
+
     public Scope getVarScope() {
         return varScope;
     }

common/src/main/java/com/dfsek/terra/config/factories/BiomeFactory.java

@@ -19,6 +19,7 @@ public class BiomeFactory implements TerraFactory<BiomeTemplate, TerraBiome> {
         GeneratorBuilder generatorBuilder = new GeneratorBuilder();
         generatorBuilder.setElevationEquation(template.getElevationEquation());
         generatorBuilder.setNoiseEquation(template.getNoiseEquation());
+        generatorBuilder.setCarvingEquation(template.getCarvingEquation());
         generatorBuilder.setNoiseBuilderMap(template.getPack().getTemplate().getNoiseBuilderMap());
         generatorBuilder.setPalettes(template.getPalette());
         generatorBuilder.setSlantPalettes(template.getSlantPalette());

common/src/main/java/com/dfsek/terra/config/templates/BiomeTemplate.java

@@ -42,6 +42,11 @@ public class BiomeTemplate extends AbstractableTemplate implements ValidatedConf
     @Default
     private String extend = null;
 
+    @Value("carving.equation")
+    @Abstractable
+    @Default
+    private String carvingEquation = "0";
+
     @Value("noise-2d.enable")
     @Default
     @Abstractable
@@ -235,6 +240,10 @@ public class BiomeTemplate extends AbstractableTemplate implements ValidatedConf
         return elevationEquation;
     }
 
+    public String getCarvingEquation() {
+        return carvingEquation;
+    }
+
     public ConfigPack getPack() {
         return pack;
     }
@@ -317,6 +326,12 @@ public class BiomeTemplate extends AbstractableTemplate implements ValidatedConf
             throw new ValidationException("Invalid noise equation: ", e);
         }
 
+        try {
+            tester.parse(carvingEquation, testScope);
+        } catch(ParseException e) {
+            throw new ValidationException("Invalid carving equation: ", e);
+        }
+
         try {
             if(elevationEquation != null) tester.parse(elevationEquation, testScope);
         } catch(ParseException e) {