PaperMC/paper-server/patches/features/0027-Optional-per-player-mob-spawns.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: kickash32 <kickash32@gmail.com>
Date: Mon, 19 Aug 2019 01:27:58 +0500
Subject: [PATCH] Optional per player mob spawns


diff --git a/net/minecraft/server/level/ChunkMap.java b/net/minecraft/server/level/ChunkMap.java
index ff6503bf8eb88d1264c3d848a89d0255b4b3ae68..9eed24939fc09f00a9dbce1be2ab9c34d024fd29 100644
--- a/net/minecraft/server/level/ChunkMap.java
+++ b/net/minecraft/server/level/ChunkMap.java
@@ -236,11 +236,29 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
         // Paper - rewrite chunk system
     }
 
-    // Paper start
-    public int getMobCountNear(final ServerPlayer player, final net.minecraft.world.entity.MobCategory mobCategory) {
-        return -1;
+    // Paper start - Optional per player mob spawns
+    public void updatePlayerMobTypeMap(final Entity entity) {
+        if (!this.level.paperConfig().entities.spawning.perPlayerMobSpawns) {
+            return;
+        }
+
+        final int index = entity.getType().getCategory().ordinal();
+        final ca.spottedleaf.moonrise.common.list.ReferenceList<ServerPlayer> inRange =
+            this.level.moonrise$getNearbyPlayers().getPlayers(entity.chunkPosition(), ca.spottedleaf.moonrise.common.misc.NearbyPlayers.NearbyMapType.TICK_VIEW_DISTANCE);
+        if (inRange == null) {
+            return;
+        }
+
+        final ServerPlayer[] backingSet = inRange.getRawDataUnchecked();
+        for (int i = 0, len = inRange.size(); i < len; i++) {
+            ++(backingSet[i].mobCounts[index]);
+        }
     }
-    // Paper end
+
+    public int getMobCountNear(final ServerPlayer player, final net.minecraft.world.entity.MobCategory mobCategory) {
+        return player.mobCounts[mobCategory.ordinal()];
+     }
+    // Paper end - Optional per player mob spawns
 
     protected ChunkGenerator generator() {
         return this.worldGenContext.generator();
diff --git a/net/minecraft/server/level/ServerChunkCache.java b/net/minecraft/server/level/ServerChunkCache.java
index 87d4291a3944f706a694536da6de0f28c548ab8d..5576bf1d1d70ab7a010653d3207909b5de867e70 100644
--- a/net/minecraft/server/level/ServerChunkCache.java
+++ b/net/minecraft/server/level/ServerChunkCache.java
@@ -517,7 +517,7 @@ public class ServerChunkCache extends ChunkSource implements ca.spottedleaf.moon
                     profilerFiller.popPush("shuffleChunks");
                     // Paper start - chunk tick iteration optimisation
                     this.shuffleRandom.setSeed(this.level.random.nextLong());
-                    Util.shuffle(list, this.shuffleRandom);
+                    if (!this.level.paperConfig().entities.spawning.perPlayerMobSpawns) Util.shuffle(list, this.shuffleRandom); // Paper - Optional per player mob spawns; do not need this when per-player is enabled
                     // Paper end - chunk tick iteration optimisation
                     this.tickChunks(profilerFiller, l, list);
                     profilerFiller.pop();
@@ -571,9 +571,18 @@ public class ServerChunkCache extends ChunkSource implements ca.spottedleaf.moon
     private void tickChunks(ProfilerFiller profiler, long timeInhabited, List<LevelChunk> chunks) {
         profiler.popPush("naturalSpawnCount");
         int naturalSpawnChunkCount = this.distanceManager.getNaturalSpawnChunkCount();
-        NaturalSpawner.SpawnState spawnState = NaturalSpawner.createState(
-            naturalSpawnChunkCount, this.level.getAllEntities(), this::getFullChunk, new LocalMobCapCalculator(this.chunkMap)
-        );
+        // Paper start - Optional per player mob spawns
+        NaturalSpawner.SpawnState spawnState;
+        if ((this.spawnFriendlies || this.spawnEnemies) && this.level.paperConfig().entities.spawning.perPlayerMobSpawns) { // don't count mobs when animals and monsters are disabled
+            // re-set mob counts
+            for (ServerPlayer player : this.level.players) {
+                Arrays.fill(player.mobCounts, 0);
+            }
+            spawnState = NaturalSpawner.createState(naturalSpawnChunkCount, this.level.getAllEntities(), this::getFullChunk, null, true);
+        } else {
+            spawnState = NaturalSpawner.createState(naturalSpawnChunkCount, this.level.getAllEntities(), this::getFullChunk, !this.level.paperConfig().entities.spawning.perPlayerMobSpawns ? new LocalMobCapCalculator(this.chunkMap) : null, false);
+        }
+        // Paper end - Optional per player mob spawns
         this.lastSpawnState = spawnState;
         profiler.popPush("spawnAndTick");
         boolean _boolean = this.level.getGameRules().getBoolean(GameRules.RULE_DOMOBSPAWNING) && !this.level.players().isEmpty(); // CraftBukkit
diff --git a/net/minecraft/server/level/ServerPlayer.java b/net/minecraft/server/level/ServerPlayer.java
index 0a7e5106a1d39150326e7c323030df5d32ecef1e..a63702dd7e86fc8b9f78c2ae23e23b65b6b2ee24 100644
--- a/net/minecraft/server/level/ServerPlayer.java
+++ b/net/minecraft/server/level/ServerPlayer.java
@@ -368,6 +368,10 @@ public class ServerPlayer extends Player implements ca.spottedleaf.moonrise.patc
     public boolean queueHealthUpdatePacket;
     public net.minecraft.network.protocol.game.ClientboundSetHealthPacket queuedHealthUpdatePacket;
     // Paper end - cancellable death event
+    // Paper start - Optional per player mob spawns
+    public static final int MOBCATEGORY_TOTAL_ENUMS = net.minecraft.world.entity.MobCategory.values().length;
+    public final int[] mobCounts = new int[MOBCATEGORY_TOTAL_ENUMS];
+    // Paper end - Optional per player mob spawns
     // CraftBukkit start
     public org.bukkit.craftbukkit.entity.CraftPlayer.TransferCookieConnection transferCookieConnection;
     public String displayName;
diff --git a/net/minecraft/world/level/NaturalSpawner.java b/net/minecraft/world/level/NaturalSpawner.java
index 913ea92ace9d610c25bf28f703a3b227044aea63..ef8bacbbb43a9b80281a313ca43b7efff5a93e03 100644
--- a/net/minecraft/world/level/NaturalSpawner.java
+++ b/net/minecraft/world/level/NaturalSpawner.java
@@ -72,6 +72,14 @@ public final class NaturalSpawner {
     public static NaturalSpawner.SpawnState createState(
         int spawnableChunkCount, Iterable<Entity> entities, NaturalSpawner.ChunkGetter chunkGetter, LocalMobCapCalculator calculator
     ) {
+        // Paper start - Optional per player mob spawns
+        return createState(spawnableChunkCount, entities, chunkGetter, calculator, false);
+    }
+
+    public static NaturalSpawner.SpawnState createState(
+        int spawnableChunkCount, Iterable<Entity> entities, NaturalSpawner.ChunkGetter chunkGetter, LocalMobCapCalculator calculator, final boolean countMobs
+    ) {
+        // Paper end - Optional per player mob spawns
         PotentialCalculator potentialCalculator = new PotentialCalculator();
         Object2IntOpenHashMap<MobCategory> map = new Object2IntOpenHashMap<>();
 
@@ -93,11 +101,16 @@ public final class NaturalSpawner {
                             potentialCalculator.addCharge(entity.blockPosition(), mobSpawnCost.charge());
                         }
 
-                        if (entity instanceof Mob) {
+                        if (calculator != null && entity instanceof Mob) { // Paper - Optional per player mob spawns
                             calculator.addMob(chunk.getPos(), category);
                         }
 
                         map.addTo(category, 1);
+                        // Paper start - Optional per player mob spawns
+                        if (countMobs) {
+                            chunk.level.getChunkSource().chunkMap.updatePlayerMobTypeMap(entity);
+                        }
+                        // Paper end - Optional per player mob spawns
                     });
                 }
             }
@@ -135,7 +148,7 @@ public final class NaturalSpawner {
             if ((spawnFriendlies || !mobCategory.isFriendly())
                 && (spawnEnemies || mobCategory.isFriendly())
                 && (spawnPassives || !mobCategory.isPersistent())
-                && spawnState.canSpawnForCategoryGlobal(mobCategory, limit)) { // Paper - Optional per player mob spawns; remove global check, check later during the local one
+                && (level.paperConfig().entities.spawning.perPlayerMobSpawns || spawnState.canSpawnForCategoryGlobal(mobCategory, limit))) { // Paper - Optional per player mob spawns; remove global check, check later during the local one
                 list.add(mobCategory);
                 // CraftBukkit end
             }
@@ -149,8 +162,37 @@ public final class NaturalSpawner {
         profilerFiller.push("spawner");
 
         for (MobCategory mobCategory : categories) {
-            if (spawnState.canSpawnForCategoryLocal(mobCategory, chunk.getPos())) {
-                spawnCategoryForChunk(mobCategory, level, chunk, spawnState::canSpawn, spawnState::afterSpawn);
+            // Paper start - Optional per player mob spawns
+            final boolean canSpawn;
+            int maxSpawns = Integer.MAX_VALUE;
+            if (level.paperConfig().entities.spawning.perPlayerMobSpawns) {
+                // Copied from getFilteredSpawningCategories
+                int limit = mobCategory.getMaxInstancesPerChunk();
+                SpawnCategory spawnCategory = CraftSpawnCategory.toBukkit(mobCategory);
+                if (CraftSpawnCategory.isValidForLimits(spawnCategory)) {
+                    limit = level.getWorld().getSpawnLimit(spawnCategory);
+                }
+
+                // Apply per-player limit
+                int minDiff = Integer.MAX_VALUE;
+                final ca.spottedleaf.moonrise.common.list.ReferenceList<net.minecraft.server.level.ServerPlayer> inRange =
+                    level.moonrise$getNearbyPlayers().getPlayers(chunk.getPos(), ca.spottedleaf.moonrise.common.misc.NearbyPlayers.NearbyMapType.TICK_VIEW_DISTANCE);
+                if (inRange != null) {
+                    final net.minecraft.server.level.ServerPlayer[] backingSet = inRange.getRawDataUnchecked();
+                    for (int k = 0, len = inRange.size(); k < len; k++) {
+                        minDiff = Math.min(limit - level.getChunkSource().chunkMap.getMobCountNear(backingSet[k], mobCategory), minDiff);
+                    }
+                }
+
+                maxSpawns = (minDiff == Integer.MAX_VALUE) ? 0 : minDiff;
+                canSpawn = maxSpawns > 0;
+            } else {
+                canSpawn = spawnState.canSpawnForCategoryLocal(mobCategory, chunk.getPos());
+            }
+            if (canSpawn) {
+                spawnCategoryForChunk(mobCategory, level, chunk, spawnState::canSpawn, spawnState::afterSpawn,
+                    maxSpawns, level.paperConfig().entities.spawning.perPlayerMobSpawns ? level.getChunkSource().chunkMap::updatePlayerMobTypeMap : null);
+                // Paper end - Optional per player mob spawns
             }
         }
 
@@ -170,9 +212,16 @@ public final class NaturalSpawner {
     public static void spawnCategoryForChunk(
         MobCategory category, ServerLevel level, LevelChunk chunk, NaturalSpawner.SpawnPredicate filter, NaturalSpawner.AfterSpawnCallback callback
     ) {
+        // Paper start - Optional per player mob spawns
+        spawnCategoryForChunk(category, level, chunk, filter, callback, Integer.MAX_VALUE, null);
+    }
+    public static void spawnCategoryForChunk(
+        MobCategory category, ServerLevel level, LevelChunk chunk, NaturalSpawner.SpawnPredicate filter, NaturalSpawner.AfterSpawnCallback callback, final int maxSpawns, final Consumer<Entity> trackEntity
+    ) {
+        // Paper end - Optional per player mob spawns
         BlockPos randomPosWithin = getRandomPosWithin(level, chunk);
         if (randomPosWithin.getY() >= level.getMinY() + 1) {
-            spawnCategoryForPosition(category, level, chunk, randomPosWithin, filter, callback);
+            spawnCategoryForPosition(category, level, chunk, randomPosWithin, filter, callback, maxSpawns, trackEntity); // Paper - Optional per player mob spawns
         }
     }
 
@@ -189,6 +238,12 @@ public final class NaturalSpawner {
         NaturalSpawner.SpawnPredicate filter,
         NaturalSpawner.AfterSpawnCallback callback
     ) {
+        spawnCategoryForPosition(category, level, chunk, pos, filter, callback, Integer.MAX_VALUE, null);
+    }
+    public static void spawnCategoryForPosition(
+        MobCategory category, ServerLevel level, ChunkAccess chunk, BlockPos pos, NaturalSpawner.SpawnPredicate filter, NaturalSpawner.AfterSpawnCallback callback, final int maxSpawns, final @Nullable Consumer<Entity> trackEntity
+    ) {
+        // Paper end - Optional per player mob spawns
         StructureManager structureManager = level.structureManager();
         ChunkGenerator generator = level.getChunkSource().getGenerator();
         int y = pos.getY();
@@ -252,9 +307,14 @@ public final class NaturalSpawner {
                                         ++i;
                                         ++i3;
                                         callback.run(mobForSpawn, chunk);
+                                        // Paper start - Optional per player mob spawns
+                                        if (trackEntity != null) {
+                                            trackEntity.accept(mobForSpawn);
+                                        }
+                                        // Paper end - Optional per player mob spawns
                                     }
                                     // CraftBukkit end
-                                    if (i >= mobForSpawn.getMaxSpawnClusterSize()) {
+                                    if (i >= mobForSpawn.getMaxSpawnClusterSize() || i >= maxSpawns) { // Paper - Optional per player mob spawns
                                         return;
                                     }
 
@@ -565,7 +625,7 @@ public final class NaturalSpawner {
             this.spawnPotential.addCharge(blockPos, d);
             MobCategory category = type.getCategory();
             this.mobCategoryCounts.addTo(category, 1);
-            this.localMobCapCalculator.addMob(new ChunkPos(blockPos), category);
+            if (this.localMobCapCalculator != null) this.localMobCapCalculator.addMob(new ChunkPos(blockPos), category); // Paper - Optional per player mob spawns
         }
 
         public int getSpawnableChunkCount() {