PaperMC/paper-server/patches/sources/net/minecraft/world/level/Level.java.patch

--- a/net/minecraft/world/level/Level.java
+++ b/net/minecraft/world/level/Level.java
@@ -27,6 +27,7 @@
 import net.minecraft.resources.ResourceLocation;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.server.level.FullChunkStatus;
+import net.minecraft.server.level.ServerLevel;
 import net.minecraft.sounds.SoundEvent;
 import net.minecraft.sounds.SoundEvents;
 import net.minecraft.sounds.SoundSource;
@@ -43,6 +44,7 @@
 import net.minecraft.world.entity.Entity;
 import net.minecraft.world.entity.boss.EnderDragonPart;
 import net.minecraft.world.entity.boss.enderdragon.EnderDragon;
+import net.minecraft.world.entity.item.ItemEntity;
 import net.minecraft.world.entity.player.Player;
 import net.minecraft.world.item.ItemStack;
 import net.minecraft.world.item.alchemy.PotionBrewing;
@@ -57,12 +59,14 @@
 import net.minecraft.world.level.block.entity.FuelValues;
 import net.minecraft.world.level.block.entity.TickingBlockEntity;
 import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.border.BorderChangeListener;
 import net.minecraft.world.level.border.WorldBorder;
 import net.minecraft.world.level.chunk.ChunkAccess;
 import net.minecraft.world.level.chunk.ChunkSource;
 import net.minecraft.world.level.chunk.LevelChunk;
 import net.minecraft.world.level.chunk.status.ChunkStatus;
 import net.minecraft.world.level.dimension.DimensionType;
+import net.minecraft.world.level.dimension.LevelStem;
 import net.minecraft.world.level.entity.EntityTypeTest;
 import net.minecraft.world.level.entity.LevelEntityGetter;
 import net.minecraft.world.level.gameevent.GameEvent;
@@ -81,6 +85,25 @@
 import net.minecraft.world.phys.Vec3;
 import net.minecraft.world.scores.Scoreboard;
 
+// CraftBukkit start
+import java.util.HashMap;
+import java.util.Map;
+import net.minecraft.network.protocol.game.ClientboundSetBorderCenterPacket;
+import net.minecraft.network.protocol.game.ClientboundSetBorderLerpSizePacket;
+import net.minecraft.network.protocol.game.ClientboundSetBorderSizePacket;
+import net.minecraft.network.protocol.game.ClientboundSetBorderWarningDelayPacket;
+import net.minecraft.network.protocol.game.ClientboundSetBorderWarningDistancePacket;
+import org.bukkit.Bukkit;
+import org.bukkit.craftbukkit.CraftServer;
+import org.bukkit.craftbukkit.CraftWorld;
+import org.bukkit.craftbukkit.SpigotTimings; // Spigot
+import org.bukkit.craftbukkit.block.CapturedBlockState;
+import org.bukkit.craftbukkit.block.data.CraftBlockData;
+import org.bukkit.craftbukkit.util.CraftSpawnCategory;
+import org.bukkit.entity.SpawnCategory;
+import org.bukkit.event.block.BlockPhysicsEvent;
+// CraftBukkit end
+
 public abstract class Level implements LevelAccessor, AutoCloseable {
 
     public static final Codec<ResourceKey<Level>> RESOURCE_KEY_CODEC = ResourceKey.codec(Registries.DIMENSION);
@@ -121,23 +144,62 @@
     private final DamageSources damageSources;
     private long subTickCount;
 
-    protected Level(WritableLevelData properties, ResourceKey<Level> registryRef, RegistryAccess registryManager, Holder<DimensionType> dimensionEntry, boolean isClient, boolean debugWorld, long seed, int maxChainedNeighborUpdates) {
-        this.levelData = properties;
-        this.dimensionTypeRegistration = dimensionEntry;
-        final DimensionType dimensionmanager = (DimensionType) dimensionEntry.value();
+    // CraftBukkit start Added the following
+    private final CraftWorld world;
+    public boolean pvpMode;
+    public org.bukkit.generator.ChunkGenerator generator;
 
-        this.dimension = registryRef;
-        this.isClientSide = isClient;
+    public boolean preventPoiUpdated = false; // CraftBukkit - SPIGOT-5710
+    public boolean captureBlockStates = false;
+    public boolean captureTreeGeneration = false;
+    public Map<BlockPos, CapturedBlockState> capturedBlockStates = new java.util.LinkedHashMap<>();
+    public Map<BlockPos, BlockEntity> capturedTileEntities = new HashMap<>();
+    public List<ItemEntity> captureDrops;
+    public final it.unimi.dsi.fastutil.objects.Object2LongOpenHashMap<SpawnCategory> ticksPerSpawnCategory = new it.unimi.dsi.fastutil.objects.Object2LongOpenHashMap<>();
+    public boolean populating;
+    public final org.spigotmc.SpigotWorldConfig spigotConfig; // Spigot
+
+    public final SpigotTimings.WorldTimingsHandler timings; // Spigot
+
+    public CraftWorld getWorld() {
+        return this.world;
+    }
+
+    public CraftServer getCraftServer() {
+        return (CraftServer) Bukkit.getServer();
+    }
+
+    public abstract ResourceKey<LevelStem> getTypeKey();
+
+    protected Level(WritableLevelData worlddatamutable, ResourceKey<Level> resourcekey, RegistryAccess iregistrycustom, Holder<DimensionType> holder, boolean flag, boolean flag1, long i, int j, org.bukkit.generator.ChunkGenerator gen, org.bukkit.generator.BiomeProvider biomeProvider, org.bukkit.World.Environment env) {
+        this.spigotConfig = new org.spigotmc.SpigotWorldConfig(((net.minecraft.world.level.storage.PrimaryLevelData) worlddatamutable).getLevelName()); // Spigot
+        this.generator = gen;
+        this.world = new CraftWorld((ServerLevel) this, gen, biomeProvider, env);
+
+        // CraftBukkit Ticks things
+        for (SpawnCategory spawnCategory : SpawnCategory.values()) {
+            if (CraftSpawnCategory.isValidForLimits(spawnCategory)) {
+                this.ticksPerSpawnCategory.put(spawnCategory, (long) this.getCraftServer().getTicksPerSpawns(spawnCategory));
+            }
+        }
+
+        // CraftBukkit end
+        this.levelData = worlddatamutable;
+        this.dimensionTypeRegistration = holder;
+        final DimensionType dimensionmanager = (DimensionType) holder.value();
+
+        this.dimension = resourcekey;
+        this.isClientSide = flag;
         if (dimensionmanager.coordinateScale() != 1.0D) {
-            this.worldBorder = new WorldBorder(this) {
+            this.worldBorder = new WorldBorder() { // CraftBukkit - decompile error
                 @Override
                 public double getCenterX() {
-                    return super.getCenterX() / dimensionmanager.coordinateScale();
+                    return super.getCenterX(); // CraftBukkit
                 }
 
                 @Override
                 public double getCenterZ() {
-                    return super.getCenterZ() / dimensionmanager.coordinateScale();
+                    return super.getCenterZ(); // CraftBukkit
                 }
             };
         } else {
@@ -145,11 +207,48 @@
         }
 
         this.thread = Thread.currentThread();
-        this.biomeManager = new BiomeManager(this, seed);
-        this.isDebug = debugWorld;
-        this.neighborUpdater = new CollectingNeighborUpdater(this, maxChainedNeighborUpdates);
-        this.registryAccess = registryManager;
-        this.damageSources = new DamageSources(registryManager);
+        this.biomeManager = new BiomeManager(this, i);
+        this.isDebug = flag1;
+        this.neighborUpdater = new CollectingNeighborUpdater(this, j);
+        this.registryAccess = iregistrycustom;
+        this.damageSources = new DamageSources(iregistrycustom);
+        // CraftBukkit start
+        this.getWorldBorder().world = (ServerLevel) this;
+        // From PlayerList.setPlayerFileData
+        this.getWorldBorder().addListener(new BorderChangeListener() {
+            @Override
+            public void onBorderSizeSet(WorldBorder border, double size) {
+                Level.this.getCraftServer().getHandle().broadcastAll(new ClientboundSetBorderSizePacket(border), border.world);
+            }
+
+            @Override
+            public void onBorderSizeLerping(WorldBorder border, double fromSize, double toSize, long time) {
+                Level.this.getCraftServer().getHandle().broadcastAll(new ClientboundSetBorderLerpSizePacket(border), border.world);
+            }
+
+            @Override
+            public void onBorderCenterSet(WorldBorder border, double centerX, double centerZ) {
+                Level.this.getCraftServer().getHandle().broadcastAll(new ClientboundSetBorderCenterPacket(border), border.world);
+            }
+
+            @Override
+            public void onBorderSetWarningTime(WorldBorder border, int warningTime) {
+                Level.this.getCraftServer().getHandle().broadcastAll(new ClientboundSetBorderWarningDelayPacket(border), border.world);
+            }
+
+            @Override
+            public void onBorderSetWarningBlocks(WorldBorder border, int warningBlockDistance) {
+                Level.this.getCraftServer().getHandle().broadcastAll(new ClientboundSetBorderWarningDistancePacket(border), border.world);
+            }
+
+            @Override
+            public void onBorderSetDamagePerBlock(WorldBorder border, double damagePerBlock) {}
+
+            @Override
+            public void onBorderSetDamageSafeZOne(WorldBorder border, double safeZoneRadius) {}
+        });
+        // CraftBukkit end
+        this.timings = new SpigotTimings.WorldTimingsHandler(this); // Spigot - code below can generate new world and access timings
     }
 
     @Override
@@ -207,6 +306,18 @@
 
     @Override
     public boolean setBlock(BlockPos pos, BlockState state, int flags, int maxUpdateDepth) {
+        // CraftBukkit start - tree generation
+        if (this.captureTreeGeneration) {
+            CapturedBlockState blockstate = this.capturedBlockStates.get(pos);
+            if (blockstate == null) {
+                blockstate = CapturedBlockState.getTreeBlockState(this, pos, flags);
+                this.capturedBlockStates.put(pos.immutable(), blockstate);
+            }
+            blockstate.setData(state);
+            blockstate.setFlag(flags);
+            return true;
+        }
+        // CraftBukkit end
         if (this.isOutsideBuildHeight(pos)) {
             return false;
         } else if (!this.isClientSide && this.isDebug()) {
@@ -214,44 +325,117 @@
         } else {
             LevelChunk chunk = this.getChunkAt(pos);
             Block block = state.getBlock();
-            BlockState iblockdata1 = chunk.setBlockState(pos, state, (flags & 64) != 0);
+
+            // CraftBukkit start - capture blockstates
+            boolean captured = false;
+            if (this.captureBlockStates && !this.capturedBlockStates.containsKey(pos)) {
+                CapturedBlockState blockstate = CapturedBlockState.getBlockState(this, pos, flags);
+                this.capturedBlockStates.put(pos.immutable(), blockstate);
+                captured = true;
+            }
+            // CraftBukkit end
 
+            BlockState iblockdata1 = chunk.setBlockState(pos, state, (flags & 64) != 0, (flags & 1024) == 0); // CraftBukkit custom NO_PLACE flag
+
             if (iblockdata1 == null) {
+                // CraftBukkit start - remove blockstate if failed (or the same)
+                if (this.captureBlockStates && captured) {
+                    this.capturedBlockStates.remove(pos);
+                }
+                // CraftBukkit end
                 return false;
             } else {
                 BlockState iblockdata2 = this.getBlockState(pos);
 
-                if (iblockdata2 == state) {
+                /*
+                if (iblockdata2 == iblockdata) {
                     if (iblockdata1 != iblockdata2) {
-                        this.setBlocksDirty(pos, iblockdata1, iblockdata2);
+                        this.setBlocksDirty(blockposition, iblockdata1, iblockdata2);
                     }
 
-                    if ((flags & 2) != 0 && (!this.isClientSide || (flags & 4) == 0) && (this.isClientSide || chunk.getFullStatus() != null && chunk.getFullStatus().isOrAfter(FullChunkStatus.BLOCK_TICKING))) {
-                        this.sendBlockUpdated(pos, iblockdata1, state, flags);
+                    if ((i & 2) != 0 && (!this.isClientSide || (i & 4) == 0) && (this.isClientSide || chunk.getFullStatus() != null && chunk.getFullStatus().isOrAfter(FullChunkStatus.BLOCK_TICKING))) {
+                        this.sendBlockUpdated(blockposition, iblockdata1, iblockdata, i);
                     }
 
-                    if ((flags & 1) != 0) {
-                        this.blockUpdated(pos, iblockdata1.getBlock());
-                        if (!this.isClientSide && state.hasAnalogOutputSignal()) {
-                            this.updateNeighbourForOutputSignal(pos, block);
+                    if ((i & 1) != 0) {
+                        this.blockUpdated(blockposition, iblockdata1.getBlock());
+                        if (!this.isClientSide && iblockdata.hasAnalogOutputSignal()) {
+                            this.updateNeighbourForOutputSignal(blockposition, block);
                         }
                     }
 
-                    if ((flags & 16) == 0 && maxUpdateDepth > 0) {
-                        int k = flags & -34;
+                    if ((i & 16) == 0 && j > 0) {
+                        int k = i & -34;
 
-                        iblockdata1.updateIndirectNeighbourShapes(this, pos, k, maxUpdateDepth - 1);
-                        state.updateNeighbourShapes(this, pos, k, maxUpdateDepth - 1);
-                        state.updateIndirectNeighbourShapes(this, pos, k, maxUpdateDepth - 1);
+                        iblockdata1.updateIndirectNeighbourShapes(this, blockposition, k, j - 1);
+                        iblockdata.updateNeighbourShapes(this, blockposition, k, j - 1);
+                        iblockdata.updateIndirectNeighbourShapes(this, blockposition, k, j - 1);
                     }
 
-                    this.onBlockStateChange(pos, iblockdata1, iblockdata2);
+                    this.onBlockStateChange(blockposition, iblockdata1, iblockdata2);
                 }
+                */
 
+                // CraftBukkit start
+                if (!this.captureBlockStates) { // Don't notify clients or update physics while capturing blockstates
+                    // Modularize client and physic updates
+                    this.notifyAndUpdatePhysics(pos, chunk, iblockdata1, state, iblockdata2, flags, maxUpdateDepth);
+                }
+                // CraftBukkit end
+
                 return true;
+            }
+        }
+    }
+
+    // CraftBukkit start - Split off from above in order to directly send client and physic updates
+    public void notifyAndUpdatePhysics(BlockPos blockposition, LevelChunk chunk, BlockState oldBlock, BlockState newBlock, BlockState actualBlock, int i, int j) {
+        BlockState iblockdata = newBlock;
+        BlockState iblockdata1 = oldBlock;
+        BlockState iblockdata2 = actualBlock;
+        if (iblockdata2 == iblockdata) {
+            if (iblockdata1 != iblockdata2) {
+                this.setBlocksDirty(blockposition, iblockdata1, iblockdata2);
+            }
+
+            if ((i & 2) != 0 && (!this.isClientSide || (i & 4) == 0) && (this.isClientSide || chunk == null || (chunk.getFullStatus() != null && chunk.getFullStatus().isOrAfter(FullChunkStatus.BLOCK_TICKING)))) { // allow chunk to be null here as chunk.isReady() is false when we send our notification during block placement
+                this.sendBlockUpdated(blockposition, iblockdata1, iblockdata, i);
+            }
+
+            if ((i & 1) != 0) {
+                this.blockUpdated(blockposition, iblockdata1.getBlock());
+                if (!this.isClientSide && iblockdata.hasAnalogOutputSignal()) {
+                    this.updateNeighbourForOutputSignal(blockposition, newBlock.getBlock());
+                }
             }
+
+            if ((i & 16) == 0 && j > 0) {
+                int k = i & -34;
+
+                // CraftBukkit start
+                iblockdata1.updateIndirectNeighbourShapes(this, blockposition, k, j - 1); // Don't call an event for the old block to limit event spam
+                CraftWorld world = ((ServerLevel) this).getWorld();
+                if (world != null) {
+                    BlockPhysicsEvent event = new BlockPhysicsEvent(world.getBlockAt(blockposition.getX(), blockposition.getY(), blockposition.getZ()), CraftBlockData.fromData(iblockdata));
+                    this.getCraftServer().getPluginManager().callEvent(event);
+
+                    if (event.isCancelled()) {
+                        return;
+                    }
+                }
+                // CraftBukkit end
+                iblockdata.updateNeighbourShapes(this, blockposition, k, j - 1);
+                iblockdata.updateIndirectNeighbourShapes(this, blockposition, k, j - 1);
+            }
+
+            // CraftBukkit start - SPIGOT-5710
+            if (!this.preventPoiUpdated) {
+                this.onBlockStateChange(blockposition, iblockdata1, iblockdata2);
+            }
+            // CraftBukkit end
         }
     }
+    // CraftBukkit end
 
     public void onBlockStateChange(BlockPos pos, BlockState oldBlock, BlockState newBlock) {}
 
@@ -340,6 +524,14 @@
 
     @Override
     public BlockState getBlockState(BlockPos pos) {
+        // CraftBukkit start - tree generation
+        if (this.captureTreeGeneration) {
+            CapturedBlockState previous = this.capturedBlockStates.get(pos);
+            if (previous != null) {
+                return previous.getHandle();
+            }
+        }
+        // CraftBukkit end
         if (this.isOutsideBuildHeight(pos)) {
             return Blocks.VOID_AIR.defaultBlockState();
         } else {
@@ -440,12 +632,15 @@
         ProfilerFiller gameprofilerfiller = Profiler.get();
 
         gameprofilerfiller.push("blockEntities");
+        this.timings.tileEntityPending.startTiming(); // Spigot
         this.tickingBlockEntities = true;
         if (!this.pendingBlockEntityTickers.isEmpty()) {
             this.blockEntityTickers.addAll(this.pendingBlockEntityTickers);
             this.pendingBlockEntityTickers.clear();
         }
+        this.timings.tileEntityPending.stopTiming(); // Spigot
 
+        this.timings.tileEntityTick.startTiming(); // Spigot
         Iterator<TickingBlockEntity> iterator = this.blockEntityTickers.iterator();
         boolean flag = this.tickRateManager().runsNormally();
 
@@ -459,13 +654,16 @@
             }
         }
 
+        this.timings.tileEntityTick.stopTiming(); // Spigot
         this.tickingBlockEntities = false;
         gameprofilerfiller.pop();
     }
 
     public <T extends Entity> void guardEntityTick(Consumer<T> tickConsumer, T entity) {
         try {
+            SpigotTimings.tickEntityTimer.startTiming(); // Spigot
             tickConsumer.accept(entity);
+            SpigotTimings.tickEntityTimer.stopTiming(); // Spigot
         } catch (Throwable throwable) {
             CrashReport crashreport = CrashReport.forThrowable(throwable, "Ticking entity");
             CrashReportCategory crashreportsystemdetails = crashreport.addCategory("Entity being ticked");
@@ -510,13 +708,29 @@
     @Nullable
     @Override
     public BlockEntity getBlockEntity(BlockPos pos) {
-        return this.isOutsideBuildHeight(pos) ? null : (!this.isClientSide && Thread.currentThread() != this.thread ? null : this.getChunkAt(pos).getBlockEntity(pos, LevelChunk.EntityCreationType.IMMEDIATE));
+        // CraftBukkit start
+        return this.getBlockEntity(pos, true);
+    }
+
+    @Nullable
+    public BlockEntity getBlockEntity(BlockPos blockposition, boolean validate) {
+        if (this.capturedTileEntities.containsKey(blockposition)) {
+            return this.capturedTileEntities.get(blockposition);
+        }
+        // CraftBukkit end
+        return this.isOutsideBuildHeight(blockposition) ? null : (!this.isClientSide && Thread.currentThread() != this.thread ? null : this.getChunkAt(blockposition).getBlockEntity(blockposition, LevelChunk.EntityCreationType.IMMEDIATE));
     }
 
     public void setBlockEntity(BlockEntity blockEntity) {
         BlockPos blockposition = blockEntity.getBlockPos();
 
         if (!this.isOutsideBuildHeight(blockposition)) {
+            // CraftBukkit start
+            if (this.captureBlockStates) {
+                this.capturedTileEntities.put(blockposition.immutable(), blockEntity);
+                return;
+            }
+            // CraftBukkit end
             this.getChunkAt(blockposition).addAndRegisterBlockEntity(blockEntity);
         }
     }
@@ -643,7 +857,7 @@
 
                 for (int k = 0; k < j; ++k) {
                     EnderDragonPart entitycomplexpart = aentitycomplexpart[k];
-                    T t0 = (Entity) filter.tryCast(entitycomplexpart);
+                    T t0 = filter.tryCast(entitycomplexpart); // CraftBukkit - decompile error
 
                     if (t0 != null && predicate.test(t0)) {
                         result.add(t0);
@@ -912,7 +1126,7 @@
 
     public static enum ExplosionInteraction implements StringRepresentable {
 
-        NONE("none"), BLOCK("block"), MOB("mob"), TNT("tnt"), TRIGGER("trigger");
+        NONE("none"), BLOCK("block"), MOB("mob"), TNT("tnt"), TRIGGER("trigger"), STANDARD("standard"); // CraftBukkit - Add STANDARD which will always use Explosion.Effect.DESTROY
 
         public static final Codec<Level.ExplosionInteraction> CODEC = StringRepresentable.fromEnum(Level.ExplosionInteraction::values);
         private final String id;