CatServer/spigot-patches/CraftBukkit-Patches/0093-Configurable-Below-Zero-Generation.patch

From b44c69f79f7b0ded43f5eb31339c8d7f5783cf96 Mon Sep 17 00:00:00 2001
From: DerFrZocker <derrieple@gmail.com>
Date: Sun, 28 Nov 2021 12:09:29 +1100
Subject: [PATCH] Configurable Below Zero Generation


diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/IChunkLoader.java b/src/main/java/net/minecraft/world/level/chunk/storage/IChunkLoader.java
index b5eb33275..1e3c7fc4b 100644
--- a/src/main/java/net/minecraft/world/level/chunk/storage/IChunkLoader.java
+++ b/src/main/java/net/minecraft/world/level/chunk/storage/IChunkLoader.java
@@ -92,12 +92,27 @@ public class IChunkLoader implements AutoCloseable {
             }
         }
 
+        // Spigot start - SPIGOT-6806: Quick and dirty way to prevent below zero generation in old chunks, by setting the status to heightmap instead of empty
+        boolean stopBelowZero = false;
+        boolean belowZeroGenerationInExistingChunks = (generatoraccess != null) ? ((WorldServer) generatoraccess).spigotConfig.belowZeroGenerationInExistingChunks : org.spigotmc.SpigotConfig.belowZeroGenerationInExistingChunks;
+
+        if (i <= 2730 && !belowZeroGenerationInExistingChunks) {
+            stopBelowZero = ChunkStatus.FULL.getName().equals(nbttagcompound.getCompound("Level").getString("Status"));
+        }
+        // Spigot end
+
         injectDatafixingContext(nbttagcompound, resourcekey, optional);
         nbttagcompound = GameProfileSerializer.update(this.fixerUpper, DataFixTypes.CHUNK, nbttagcompound, Math.max(1493, i));
         if (i < SharedConstants.getCurrentVersion().getWorldVersion()) {
             nbttagcompound.putInt("DataVersion", SharedConstants.getCurrentVersion().getWorldVersion());
         }
 
+        // Spigot start
+        if (stopBelowZero) {
+            nbttagcompound.putString("Status", ChunkStatus.HEIGHTMAPS.getName());
+        }
+        // Spigot end
+
         nbttagcompound.remove("__context");
         return nbttagcompound;
     }
-- 
2.25.1