begin implementing BiomeExtrusionAddon

common/addons/biome-provider-extrusion/src/main/java/com/dfsek/terra/addons/biome/extrusion/BiomeExtrusionAddon.java

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+package com.dfsek.terra.addons.biome.extrusion;
+
+import com.dfsek.tectonic.api.config.template.object.ObjectTemplate;
+
+import com.dfsek.terra.addons.biome.extrusion.api.Extrusion;
+import com.dfsek.terra.addons.manifest.api.AddonInitializer;
+import com.dfsek.terra.api.Platform;
+import com.dfsek.terra.api.addon.BaseAddon;
+import com.dfsek.terra.api.event.events.config.pack.ConfigPackPreLoadEvent;
+import com.dfsek.terra.api.event.functional.FunctionalEventHandler;
+import com.dfsek.terra.api.inject.annotations.Inject;
+import com.dfsek.terra.api.registry.CheckedRegistry;
+import com.dfsek.terra.api.util.reflection.TypeKey;
+import com.dfsek.terra.api.world.biome.generation.BiomeProvider;
+
+import java.util.function.Supplier;
+
+
+public class BiomeExtrusionAddon implements AddonInitializer {
+    public static final TypeKey<Supplier<ObjectTemplate<Extrusion>>> EXTRUSION_REGISTRY_KEY = new TypeKey<>() {
+    };
+    
+    @Inject
+    private Platform platform;
+    
+    @Inject
+    private BaseAddon addon;
+    
+    @Override
+    public void initialize() {
+        platform.getEventManager()
+                .getHandler(FunctionalEventHandler.class)
+                .register(addon, ConfigPackPreLoadEvent.class)
+                .then(event -> {
+                
+                })
+                .failThrough();
+    }
+}

common/addons/biome-provider-extrusion/src/main/java/com/dfsek/terra/addons/biome/extrusion/BiomeExtrusionProvider.java

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+package com.dfsek.terra.addons.biome.extrusion;
+
+import com.dfsek.terra.api.world.biome.Biome;
+import com.dfsek.terra.api.world.biome.generation.BiomeProvider;
+
+import java.util.HashSet;
+import java.util.Set;
+import java.util.stream.Collectors;
+import java.util.stream.StreamSupport;
+
+
+public class BiomeExtrusionProvider implements BiomeProvider {
+    private final BiomeProvider delegate;
+    private final Set<Biome> biomes;
+    
+    public BiomeExtrusionProvider(BiomeProvider delegate) {
+        this.delegate = delegate;
+        this.biomes = delegate.stream().collect(Collectors.toSet());
+    }
+    
+    @Override
+    public Biome getBiome(int x, int y, int z, long seed) {
+        return delegate.getBiome(x, y, z, seed);
+    }
+    
+    @Override
+    public Iterable<Biome> getBiomes() {
+        return biomes;
+    }
+}

common/addons/biome-provider-extrusion/src/main/java/com/dfsek/terra/addons/biome/extrusion/api/Extrusion.java

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+package com.dfsek.terra.addons.biome.extrusion.api;
+
+import com.dfsek.terra.api.world.biome.Biome;
+
+
+public interface Extrusion {
+    Biome extrude(Biome original, int x, int y, int z, long seed);
+    
+    Iterable<Biome> getBiomes();
+}

common/addons/biome-provider-extrusion/src/main/java/com/dfsek/terra/addons/biome/extrusion/extrusions/SamplerExtrusion.java

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+package com.dfsek.terra.addons.biome.extrusion.extrusions;
+
+import com.dfsek.terra.addons.biome.extrusion.api.Extrusion;
+import com.dfsek.terra.api.noise.NoiseSampler;
+import com.dfsek.terra.api.world.biome.Biome;
+
+import java.security.cert.Extension;
+
+
+/**
+ * Extrusion which operates using a noise sampler
+ */
+public abstract class SamplerExtrusion implements Extrusion {
+    protected NoiseSampler sampler;
+    
+    @Override
+    public Biome extrude(Biome original, int x, int y, int z, long seed) {
+        return null;
+    }
+}

common/addons/biome-provider-extrusion/src/main/java/com/dfsek/terra/addons/biome/extrusion/extrusions/SetExtrusion.java

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+package com.dfsek.terra.addons.biome.extrusion.extrusions;
+
+/**
+ * Sets biomes at locations based on a sampler.
+ */
+public class SetExtrusion {
+}

common/addons/biome-provider-extrusion/src/main/resources/terra.addon.yml

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+schema-version: 1
+contributors:
+  - Terra contributors
+id: biome-provider-extrusion
+version: @VERSION@
+entrypoints:
+  - "com.dfsek.terra.addons.biome.extrusion.BiomeExtrusionAddon"
+website:
+  issues: https://github.com/PolyhedralDev/Terra/issues
+  source: https://github.com/PolyhedralDev/Terra
+  docs: https://terra.polydev.org
+license: MIT License