Default to void world generator for Erethon

Author: Malfrador

papyrus-server/paper-patches/files/src/main/java/org/bukkit/craftbukkit/CraftServer.java.patch

@@ -1,6 +1,11 @@
 --- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
 +++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
-@@ -15,6 +_,7 @@
+@@ -11,10 +_,12 @@
+ import com.mojang.brigadier.exceptions.CommandSyntaxException;
+ import com.mojang.serialization.Dynamic;
+ import com.mojang.serialization.Lifecycle;
++import de.erethon.papyrus.world.ErethonVoidGenerator;
+ import io.papermc.paper.configuration.GlobalConfiguration;
  import io.papermc.paper.configuration.PaperServerConfiguration;
  import io.papermc.paper.configuration.ServerConfiguration;
  import io.papermc.paper.world.PaperWorldLoader;
@@ -19,19 +24,32 @@
      static {
          ConfigurationSerialization.registerClass(CraftOfflinePlayer.class);
          ConfigurationSerialization.registerClass(CraftPlayerProfile.class);
-@@ -484,6 +_,15 @@
-         this.potionBrewer = new io.papermc.paper.potion.PaperPotionBrewer(console); // Paper - custom potion mixes
-         datapackManager = new io.papermc.paper.datapack.PaperDatapackManager(console.getPackRepository()); // Paper
+@@ -486,6 +_,15 @@
          this.spark = new io.papermc.paper.SparksFly(this); // Paper - spark
-+    }
-+
+     }
+ 
 +    @Override
 +    public SpellbookAPI getSpellbookAPI() {
 +        return spellbookAPI;
 +    }
 +
 +    public void setSpellbookAPI(SpellbookAPI api) {
 +        this.spellbookAPI = api;
++    }
++
+     public boolean getCommandBlockOverride(String command) {
+         return this.overrideAllCommandBlockCommands || this.commandsConfiguration.getStringList("command-block-overrides").contains(command);
+     }
+@@ -1748,6 +_,12 @@
      }
 
-     public boolean getCommandBlockOverride(String command) {
+     public ChunkGenerator getGenerator(String world) {
++        // Papyrus start - Void gen
++        if (world.equalsIgnoreCase("Erethon")) {
++            this.getLogger().info("Using ErethonVoidGenerator for out-of-bounds generation...");
++            return new ErethonVoidGenerator();
++        }
++        // Papyrus end
+         ConfigurationSection section = this.configuration.getConfigurationSection("worlds");
+         ChunkGenerator result = null;
+ 

papyrus-server/src/main/java/de/erethon/papyrus/world/ErethonVoidGenerator.java

@@ -0,0 +1,60 @@
+package de.erethon.papyrus.world;
+
+import org.bukkit.World;
+import org.bukkit.block.Biome;
+import org.bukkit.generator.BiomeProvider;
+import org.bukkit.generator.BlockPopulator;
+import org.bukkit.generator.ChunkGenerator;
+import org.bukkit.generator.WorldInfo;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.List;
+import java.util.Random;
+
+// Simple void generator to prevent chunk gen outside our pre-generated WorldPainter world
+public class ErethonVoidGenerator extends ChunkGenerator {
+
+    @Override
+    public @NotNull List<BlockPopulator> getDefaultPopulators(@NotNull World world) { return List.of(); }
+
+    @Override
+    public void generateNoise(@NotNull WorldInfo worldInfo, @NotNull Random random, int chunkX, int chunkZ,
+                              @NotNull ChunkData chunkData) {
+        // No need to generate noise, we want an empty world
+    }
+    @Override
+    public void generateSurface(@NotNull WorldInfo worldInfo, @NotNull Random random, int chunkX, int chunkZ,
+                                @NotNull ChunkData chunkData) {
+        // No need to generate surface, we want an empty world
+    }
+    @Override
+    public void generateBedrock(@NotNull WorldInfo worldInfo, @NotNull Random random, int chunkX, int chunkZ,
+                                @NotNull ChunkData chunkData) {
+        // No need to generate bedrock, we want an empty world
+    }
+    @Override
+    public void generateCaves(@NotNull WorldInfo worldInfo, @NotNull Random random, int chunkX, int chunkZ,
+                              @NotNull ChunkData chunkData) {
+        // No need to generate caves, we want an empty world
+    }
+
+    @Override
+    @Nullable
+    public BiomeProvider getDefaultBiomeProvider(@NotNull WorldInfo worldInfo) { return new VoidBiomeProvider(); }
+
+    @Override
+    public boolean canSpawn(World world, int x, int z) { return true; }
+
+
+    private static class VoidBiomeProvider extends BiomeProvider {
+
+        @Override
+        public @NotNull Biome getBiome(@NotNull WorldInfo worldInfo, int x, int y, int z) { return Biome.THE_VOID; }
+
+        @Override
+        public @NotNull List<Biome> getBiomes(@NotNull WorldInfo worldInfo) { return List.of(Biome.THE_VOID); }
+
+    }
+}
+