1 files changed, 98 insertions, 0 deletions
diff --git a/patches/server/0811-Implement-regenerateChunk.patch b/patches/server/0811-Implement-regenerateChunk.patch
new file mode 100644
index 0000000000..52ed98a62f
--- /dev/null
+++ b/patches/server/0811-Implement-regenerateChunk.patch
@@ -0,0 +1,98 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Nassim Jahnke <[email protected]>
+Date: Mon, 31 Jan 2022 11:21:50 +0100
+Subject: [PATCH] Implement regenerateChunk
+
+Co-authored-by: Jason Penilla <[email protected]>
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+index 36a8552f046f8f6bf8138bef4ff0c526425e57a4..7757e5b1aec0b1f0cba79aa4618a7fe1d210b72c 100644
+--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
++++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+@@ -139,6 +139,7 @@ import org.bukkit.util.Vector;
+ public class CraftWorld extends CraftRegionAccessor implements World {
+     public static final int CUSTOM_DIMENSION_OFFSET = 10;
+     private static final CraftPersistentDataTypeRegistry DATA_TYPE_REGISTRY = new CraftPersistentDataTypeRegistry();
++    private static final ChunkStatus[] REGEN_CHUNK_STATUSES = {ChunkStatus.BIOMES, ChunkStatus.NOISE, ChunkStatus.SURFACE, ChunkStatus.CARVERS, ChunkStatus.LIQUID_CARVERS, ChunkStatus.FEATURES}; // Paper - implement regenerate chunk method
+ 
+     private final ServerLevel world;
+     private WorldBorder worldBorder;
+@@ -419,27 +420,62 @@ public class CraftWorld extends CraftRegionAccessor implements World {
+     @Override
+     public boolean regenerateChunk(int x, int z) {
+         org.spigotmc.AsyncCatcher.catchOp("chunk regenerate"); // Spigot
+-        throw new UnsupportedOperationException("Not supported in this Minecraft version! Unless you can fix it, this is not a bug :)");
+-        /*
+-        if (!unloadChunk0(x, z, false)) {
+-            return false;
+-        }
+-
+-        final long chunkKey = ChunkCoordIntPair.pair(x, z);
+-        world.getChunkProvider().unloadQueue.remove(chunkKey);
++        // Paper start - implement regenerateChunk method
++        final ServerLevel serverLevel = this.world;
++        final net.minecraft.server.level.ServerChunkCache serverChunkCache = serverLevel.getChunkSource();
++        final ChunkPos chunkPos = new ChunkPos(x, z);
++        final net.minecraft.world.level.chunk.LevelChunk levelChunk = serverChunkCache.getChunk(chunkPos.x, chunkPos.z, true);
++        for (final BlockPos blockPos : BlockPos.betweenClosed(chunkPos.getMinBlockX(), serverLevel.getMinBuildHeight(), chunkPos.getMinBlockZ(), chunkPos.getMaxBlockX(), serverLevel.getMaxBuildHeight() - 1, chunkPos.getMaxBlockZ())) {
++            levelChunk.removeBlockEntity(blockPos);
++            serverLevel.setBlock(blockPos, net.minecraft.world.level.block.Blocks.AIR.defaultBlockState(), 16);
++        }
++
++        for (final ChunkStatus chunkStatus : REGEN_CHUNK_STATUSES) {
++            final List<ChunkAccess> list = new ArrayList<>();
++            final int range = Math.max(1, chunkStatus.getRange());
++            for (int chunkX = chunkPos.z - range; chunkX <= chunkPos.z + range; chunkX++) {
++                for (int chunkZ = chunkPos.x - range; chunkZ <= chunkPos.x + range; chunkZ++) {
++                    ChunkAccess chunkAccess = serverChunkCache.getChunk(chunkZ, chunkX, chunkStatus.getParent(), true);
++                    if (chunkAccess instanceof ImposterProtoChunk accessProtoChunk) {
++                        chunkAccess = new ImposterProtoChunk(accessProtoChunk.getWrapped(), true);
++                    } else if (chunkAccess instanceof net.minecraft.world.level.chunk.LevelChunk accessLevelChunk) {
++                        chunkAccess = new ImposterProtoChunk(accessLevelChunk, true);
++                    }
++                    list.add(chunkAccess);
++                }
++            }
+ 
+-        net.minecraft.server.Chunk chunk = world.getChunkProvider().generateChunk(x, z);
+-        PlayerChunk playerChunk = world.getPlayerChunkMap().getChunk(x, z);
+-        if (playerChunk != null) {
+-            playerChunk.chunk = chunk;
++            final java.util.concurrent.CompletableFuture<com.mojang.datafixers.util.Either<ChunkAccess, ChunkHolder.ChunkLoadingFailure>> future = chunkStatus.generate(
++                Runnable::run,
++                serverLevel,
++                serverChunkCache.getGenerator(),
++                serverLevel.getStructureManager(),
++                serverChunkCache.getLightEngine(),
++                chunk -> {
++                    throw new UnsupportedOperationException("Not creating full chunks here");
++                },
++                list,
++                true
++            );
++            serverChunkCache.mainThreadProcessor.managedBlock(future::isDone);
++            if (chunkStatus == ChunkStatus.NOISE) {
++                future.join().left().ifPresent(chunk -> net.minecraft.world.level.levelgen.Heightmap.primeHeightmaps(chunk, ChunkStatus.POST_FEATURES));
++            }
+         }
+ 
+-        if (chunk != null) {
+-            refreshChunk(x, z);
++        for (final BlockPos blockPos : BlockPos.betweenClosed(chunkPos.getMinBlockX(), serverLevel.getMinBuildHeight(), chunkPos.getMinBlockZ(), chunkPos.getMaxBlockX(), serverLevel.getMaxBuildHeight() - 1, chunkPos.getMaxBlockZ())) {
++            serverChunkCache.blockChanged(blockPos);
+         }
+ 
+-        return chunk != null;
+-        */
++        final Set<ChunkPos> chunksToRelight = new HashSet<>(9);
++        for (int chunkX = chunkPos.x - 1; chunkX <= chunkPos.x + 1 ; chunkX++) {
++            for (int chunkZ = chunkPos.z - 1; chunkZ <= chunkPos.z + 1 ; chunkZ++) {
++                chunksToRelight.add(new ChunkPos(chunkX, chunkZ));
++            }
++        }
++        serverChunkCache.getLightEngine().relight(chunksToRelight, pos -> {}, relit -> {});
++        return true;
++        // Paper end
+     }
+ 
+     @Override