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Paper/patches/server/0771-Allow-delegation-to-vanilla-chunk-gen.patch
Spottedleaf 01a13871de
Rewrite chunk system (#8177) 
Patch documentation to come

Issues with the old system that are fixed now:
- World generation does not scale with cpu cores effectively.
- Relies on the main thread for scheduling and maintaining chunk state, dropping chunk load/generate rates at lower tps.
- Unreliable prioritisation of chunk gen/load calls that block the main thread.
- Shutdown logic is utterly unreliable, as it has to wait for all chunks to unload - is it guaranteed that the chunk system is in a state on shutdown that it can reliably do this? Watchdog shutdown also typically failed due to thread checks, which is now resolved.
- Saving of data is not unified (i.e can save chunk data without saving entity data, poses problems for desync if shutdown is really abnormal.
- Entities are not loaded with chunks. This caused quite a bit of headache for Chunk#getEntities API, but now the new chunk system loads entities with chunks so that they are ready whenever the chunk loads in. Effectively brings the behavior back to 1.16 era, but still storing entities in their own separate regionfiles.

The above list is not complete. The patch documentation will complete it.

New chunk system hard relies on starlight and dataconverter, and most importantly the new concurrent utilities in ConcurrentUtil.

Some of the old async chunk i/o interface (i.e the old file io thread reroutes _some_ calls to the new file io thread) is kept for plugin compat reasons. It will be removed in the next major version of minecraft.

The old legacy chunk system patches have been moved to the removed folder in case we need them again.
2022-09-26 01:02:51 -07:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: MiniDigger <admin@benndorf.dev>
Date: Wed, 29 Apr 2020 02:10:32 +0200
Subject: [PATCH] Allow delegation to vanilla chunk gen
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index 2f793169ee3b8265059f75c5a3cc13a86acedc83..bf747c7584733014aac771ba4ca039c588582f25 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -2329,6 +2329,90 @@ public final class CraftServer implements Server {
return new OldCraftChunkData(world.getMinHeight(), world.getMaxHeight(), handle.registryAccess().registryOrThrow(net.minecraft.core.Registry.BIOME_REGISTRY), world); // Paper - Anti-Xray - Add parameters
}
+ // Paper start
+ private static final List<net.minecraft.world.level.chunk.ChunkStatus> VANILLA_GEN_STATUSES = List.of(
+ net.minecraft.world.level.chunk.ChunkStatus.EMPTY,
+ net.minecraft.world.level.chunk.ChunkStatus.STRUCTURE_STARTS,
+ net.minecraft.world.level.chunk.ChunkStatus.STRUCTURE_REFERENCES,
+ net.minecraft.world.level.chunk.ChunkStatus.BIOMES,
+ net.minecraft.world.level.chunk.ChunkStatus.NOISE,
+ net.minecraft.world.level.chunk.ChunkStatus.SURFACE,
+ net.minecraft.world.level.chunk.ChunkStatus.CARVERS,
+ net.minecraft.world.level.chunk.ChunkStatus.LIQUID_CARVERS,
+ net.minecraft.world.level.chunk.ChunkStatus.FEATURES,
+ net.minecraft.world.level.chunk.ChunkStatus.LIGHT
+ );
+
+ @Override
+ @Deprecated(forRemoval = true)
+ public ChunkGenerator.ChunkData createVanillaChunkData(World world, int x, int z) {
+ // do bunch of vanilla shit
+ final net.minecraft.server.level.ServerLevel serverLevel = ((CraftWorld) world).getHandle();
+ final net.minecraft.core.Registry<net.minecraft.world.level.biome.Biome> biomeRegistry = serverLevel.getServer().registryAccess().registryOrThrow(net.minecraft.core.Registry.BIOME_REGISTRY);
+ final net.minecraft.world.level.chunk.ProtoChunk protoChunk = new net.minecraft.world.level.chunk.ProtoChunk(
+ new net.minecraft.world.level.ChunkPos(x, z),
+ net.minecraft.world.level.chunk.UpgradeData.EMPTY,
+ serverLevel,
+ biomeRegistry,
+ null
+ );
+
+ final net.minecraft.world.level.chunk.ChunkGenerator chunkGenerator;
+ if (serverLevel.chunkSource.getGenerator() instanceof org.bukkit.craftbukkit.generator.CustomChunkGenerator bukkit) {
+ chunkGenerator = bukkit.delegate;
+ } else {
+ chunkGenerator = serverLevel.chunkSource.getGenerator();
+ }
+
+ final net.minecraft.world.level.ChunkPos chunkPos = new net.minecraft.world.level.ChunkPos(x, z);
+ final net.minecraft.util.thread.ProcessorMailbox<Runnable> mailbox = net.minecraft.util.thread.ProcessorMailbox.create(
+ net.minecraft.Util.backgroundExecutor(),
+ "CraftServer#createVanillaChunkData(worldName='" + world.getName() + "', x='" + x + "', z='" + z + "')"
+ );
+ for (final net.minecraft.world.level.chunk.ChunkStatus chunkStatus : VANILLA_GEN_STATUSES) {
+ final List<net.minecraft.world.level.chunk.ChunkAccess> chunks = Lists.newArrayList();
+ final int statusRange = Math.max(1, chunkStatus.getRange());
+
+ for (int zz = chunkPos.z - statusRange; zz <= chunkPos.z + statusRange; ++zz) {
+ for (int xx = chunkPos.x - statusRange; xx <= chunkPos.x + statusRange; ++xx) {
+ if (xx == chunkPos.x && zz == chunkPos.z) {
+ chunks.add(protoChunk);
+ } else {
+ final net.minecraft.core.Holder<net.minecraft.world.level.biome.Biome> biomeHolder = serverLevel.registryAccess().registryOrThrow(net.minecraft.core.Registry.BIOME_REGISTRY).getHolderOrThrow(net.minecraft.world.level.biome.Biomes.PLAINS);
+ final net.minecraft.world.level.chunk.ChunkAccess chunk = new net.minecraft.world.level.chunk.EmptyLevelChunk(serverLevel, new net.minecraft.world.level.ChunkPos(xx, zz), biomeHolder);
+ chunks.add(chunk);
+ }
+ }
+ }
+
+ chunkStatus.generate(
+ mailbox::tell,
+ serverLevel,
+ chunkGenerator,
+ serverLevel.getStructureManager(),
+ serverLevel.chunkSource.getLightEngine(),
+ chunk -> {
+ throw new UnsupportedOperationException("Not creating full chunks here");
+ },
+ chunks,
+ true
+ ).thenAccept(either -> {
+ if (chunkStatus == net.minecraft.world.level.chunk.ChunkStatus.NOISE) {
+ either.left().ifPresent(chunk -> net.minecraft.world.level.levelgen.Heightmap.primeHeightmaps(chunk, net.minecraft.world.level.chunk.ChunkStatus.POST_FEATURES));
+ }
+ }).join();
+ }
+
+ // get empty object
+ OldCraftChunkData data = (OldCraftChunkData) this.createChunkData(world);
+ // copy over generated sections
+ data.getLights().addAll(protoChunk.getLights().toList());
+ data.setRawChunkData(protoChunk.getSections());
+ // hooray!
+ return data;
+ }
+ // Paper end
+
@Override
public BossBar createBossBar(String title, BarColor color, BarStyle style, BarFlag... flags) {
return new CraftBossBar(title, color, style, flags);
diff --git a/src/main/java/org/bukkit/craftbukkit/generator/OldCraftChunkData.java b/src/main/java/org/bukkit/craftbukkit/generator/OldCraftChunkData.java
index 4a23d03757e1735b9ebb8c003adcc0374a7d672d..ce006e1d6c38e5b0bdb336c480fb9d291292f75c 100644
--- a/src/main/java/org/bukkit/craftbukkit/generator/OldCraftChunkData.java
+++ b/src/main/java/org/bukkit/craftbukkit/generator/OldCraftChunkData.java
@@ -23,7 +23,7 @@ import org.bukkit.material.MaterialData;
public final class OldCraftChunkData implements ChunkGenerator.ChunkData {
private final int minHeight;
private final int maxHeight;
- private final LevelChunkSection[] sections;
+ private LevelChunkSection[] sections; // Paper
private final Registry<net.minecraft.world.level.biome.Biome> biomes;
private Set<BlockPos> tiles;
private final Set<BlockPos> lights = new HashSet<>();
@@ -194,7 +194,13 @@ public final class OldCraftChunkData implements ChunkGenerator.ChunkData {
return this.tiles;
}
- Set<BlockPos> getLights() {
+ public Set<BlockPos> getLights() { // Paper
return this.lights;
}
+
+ // Paper start
+ public void setRawChunkData(LevelChunkSection[] sections) {
+ this.sections = sections;
+ }
+ // Paper end
}
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