Paper/patches/server/1053-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

Feature patch

diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
index f1999729cd1c00071c5e1835ee49ea5fcafa7b05..4896c3ba81ead769972fa9efdbe563d4006e4401 100644
--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
@@ -229,8 +229,26 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
     }
 
     // Paper start
+    // 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]);
+        }
+    }
     public int getMobCountNear(final ServerPlayer player, final net.minecraft.world.entity.MobCategory mobCategory) {
-        return -1;
+        return player.mobCounts[mobCategory.ordinal()];
+        // Paper end - Optional per player mob spawns
     }
     // Paper end
 
diff --git a/src/main/java/net/minecraft/server/level/ServerChunkCache.java b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
index 38ac7fd8e68f535a5e9bdd816997e865b7694af1..b1ecc218034944533967375d11297705c3fc01a3 100644
--- a/src/main/java/net/minecraft/server/level/ServerChunkCache.java
+++ b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
@@ -492,7 +492,7 @@ public class ServerChunkCache extends ChunkSource implements ca.spottedleaf.moon
                     gameprofilerfiller.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(gameprofilerfiller, j, list);
                     gameprofilerfiller.pop();
@@ -549,7 +549,19 @@ public class ServerChunkCache extends ChunkSource implements ca.spottedleaf.moon
     private void tickChunks(ProfilerFiller profiler, long timeDelta, List<LevelChunk> chunks) {
         profiler.popPush("naturalSpawnCount");
         int j = this.distanceManager.getNaturalSpawnChunkCount();
-        NaturalSpawner.SpawnState spawnercreature_d = NaturalSpawner.createState(j, this.level.getAllEntities(), this::getFullChunk, new LocalMobCapCalculator(this.chunkMap));
+        // Paper start - Optional per player mob spawns
+        final int naturalSpawnChunkCount = j;
+        NaturalSpawner.SpawnState spawnercreature_d; // moved down
+        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);
+            }
+            spawnercreature_d = NaturalSpawner.createState(naturalSpawnChunkCount, this.level.getAllEntities(), this::getFullChunk, null, true);
+        } else {
+            spawnercreature_d = 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 = spawnercreature_d;
         profiler.popPush("spawnAndTick");
diff --git a/src/main/java/net/minecraft/server/level/ServerPlayer.java b/src/main/java/net/minecraft/server/level/ServerPlayer.java
index 8c9148426f23cbbdfaf7ae66657d1a620f8bd853..8cc02ee9b1a710e35eb65a5a095681cc7dc542bb 100644
--- a/src/main/java/net/minecraft/server/level/ServerPlayer.java
+++ b/src/main/java/net/minecraft/server/level/ServerPlayer.java
@@ -303,6 +303,10 @@ public class ServerPlayer extends net.minecraft.world.entity.player.Player imple
     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
+    // Paper end - Optional per player mob spawns
 
     // CraftBukkit start
     public CraftPlayer.TransferCookieConnection transferCookieConnection;
diff --git a/src/main/java/net/minecraft/world/level/NaturalSpawner.java b/src/main/java/net/minecraft/world/level/NaturalSpawner.java
index bf943feca387b77a3154773a59da7190d38d8621..0beb5ab48c5405d9bc2ad8d0c430312f456d38c2 100644
--- a/src/main/java/net/minecraft/world/level/NaturalSpawner.java
+++ b/src/main/java/net/minecraft/world/level/NaturalSpawner.java
@@ -71,6 +71,12 @@ public final class NaturalSpawner {
     private NaturalSpawner() {}
 
     public static NaturalSpawner.SpawnState createState(int spawningChunkCount, Iterable<Entity> entities, NaturalSpawner.ChunkGetter chunkSource, LocalMobCapCalculator densityCapper) {
+        // Paper start - Optional per player mob spawns
+        return createState(spawningChunkCount, entities, chunkSource, densityCapper, false);
+    }
+
+    public static NaturalSpawner.SpawnState createState(int spawningChunkCount, Iterable<Entity> entities, NaturalSpawner.ChunkGetter chunkSource, LocalMobCapCalculator densityCapper, boolean countMobs) {
+        // Paper end - Optional per player mob spawns
         PotentialCalculator spawnercreatureprobabilities = new PotentialCalculator();
         Object2IntOpenHashMap<MobCategory> object2intopenhashmap = new Object2IntOpenHashMap();
         Iterator iterator = entities.iterator();
@@ -103,11 +109,16 @@ public final class NaturalSpawner {
                         spawnercreatureprobabilities.addCharge(entity.blockPosition(), biomesettingsmobs_b.charge());
                     }
 
-                    if (entity instanceof Mob) {
+                    if (densityCapper != null && entity instanceof Mob) { // Paper - Optional per player mob spawns
                         densityCapper.addMob(chunk.getPos(), enumcreaturetype);
                     }
 
                     object2intopenhashmap.addTo(enumcreaturetype, 1);
+                    // Paper start - Optional per player mob spawns
+                    if (countMobs) {
+                        chunk.level.getChunkSource().chunkMap.updatePlayerMobTypeMap(entity);
+                    }
+                    // Paper end - Optional per player mob spawns
                 });
             }
         }
@@ -142,7 +153,7 @@ public final class NaturalSpawner {
                 continue;
             }
 
-            if ((flag || !enumcreaturetype.isFriendly()) && (flag1 || enumcreaturetype.isFriendly()) && (flag2 || !enumcreaturetype.isPersistent()) && spawnercreature_d.canSpawnForCategoryGlobal(enumcreaturetype, limit)) {
+            if ((flag || !enumcreaturetype.isFriendly()) && (flag1 || enumcreaturetype.isFriendly()) && (flag2 || !enumcreaturetype.isPersistent()) && (!worldserver.paperConfig().entities.spawning.perPlayerMobSpawns || spawnercreature_d.canSpawnForCategoryGlobal(enumcreaturetype, limit))) { // Paper - Optional per player mob spawns; remove global check, check later during the local one
                 // CraftBukkit end
                 list.add(enumcreaturetype);
             }
@@ -160,12 +171,43 @@ public final class NaturalSpawner {
         while (iterator.hasNext()) {
             MobCategory enumcreaturetype = (MobCategory) iterator.next();
 
-            if (info.canSpawnForCategoryLocal(enumcreaturetype, chunk.getPos())) {
+            // Paper start - Optional per player mob spawns
+            final boolean canSpawn;
+            int maxSpawns = Integer.MAX_VALUE;
+            if (world.paperConfig().entities.spawning.perPlayerMobSpawns) {
+                // Copied from getFilteredSpawningCategories
+                int limit = enumcreaturetype.getMaxInstancesPerChunk();
+                SpawnCategory spawnCategory = CraftSpawnCategory.toBukkit(enumcreaturetype);
+                if (CraftSpawnCategory.isValidForLimits(spawnCategory)) {
+                    limit = world.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 =
+                    world.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 - world.getChunkSource().chunkMap.getMobCountNear(backingSet[k], enumcreaturetype), minDiff);
+                    }
+                }
+
+                maxSpawns = (minDiff == Integer.MAX_VALUE) ? 0 : minDiff;
+                canSpawn = maxSpawns > 0;
+            } else {
+                canSpawn = info.canSpawnForCategoryLocal(enumcreaturetype, chunk.getPos());
+            }
+            if (canSpawn) {
+                // Paper end - Optional per player mob spawns
                 Objects.requireNonNull(info);
                 NaturalSpawner.SpawnPredicate spawnercreature_c = info::canSpawn;
 
                 Objects.requireNonNull(info);
-                NaturalSpawner.spawnCategoryForChunk(enumcreaturetype, world, chunk, spawnercreature_c, info::afterSpawn);
+                // Paper start - Optional per player mob spawns
+                NaturalSpawner.spawnCategoryForChunk(enumcreaturetype, world, chunk, spawnercreature_c, info::afterSpawn,
+                    maxSpawns, world.paperConfig().entities.spawning.perPlayerMobSpawns ? world.getChunkSource().chunkMap::updatePlayerMobTypeMap : null);
+                // Paper end - Optional per player mob spawns
             }
         }
 
@@ -183,10 +225,15 @@ public final class NaturalSpawner {
     // Paper end - Add mobcaps commands
 
     public static void spawnCategoryForChunk(MobCategory group, ServerLevel world, LevelChunk chunk, NaturalSpawner.SpawnPredicate checker, NaturalSpawner.AfterSpawnCallback runner) {
+        // Paper start - Optional per player mob spawns
+        spawnCategoryForChunk(group, world, chunk, checker, runner, Integer.MAX_VALUE, null);
+    }
+    public static void spawnCategoryForChunk(MobCategory group, ServerLevel world, LevelChunk chunk, NaturalSpawner.SpawnPredicate checker, NaturalSpawner.AfterSpawnCallback runner, int maxSpawns, Consumer<Entity> trackEntity) {
+        // Paper end - Optional per player mob spawns
         BlockPos blockposition = NaturalSpawner.getRandomPosWithin(world, chunk);
 
         if (blockposition.getY() >= world.getMinY() + 1) {
-            NaturalSpawner.spawnCategoryForPosition(group, world, chunk, blockposition, checker, runner);
+            NaturalSpawner.spawnCategoryForPosition(group, world, chunk, blockposition, checker, runner, maxSpawns, trackEntity); // Paper - Optional per player mob spawns
         }
     }
 
@@ -198,7 +245,12 @@ public final class NaturalSpawner {
         });
     }
 
+    // Paper start - Optional per player mob spawns
     public static void spawnCategoryForPosition(MobCategory group, ServerLevel world, ChunkAccess chunk, BlockPos pos, NaturalSpawner.SpawnPredicate checker, NaturalSpawner.AfterSpawnCallback runner) {
+        spawnCategoryForPosition(group, world,chunk, pos, checker, runner, Integer.MAX_VALUE, null);
+    }
+    public static void spawnCategoryForPosition(MobCategory group, ServerLevel world, ChunkAccess chunk, BlockPos pos, NaturalSpawner.SpawnPredicate checker, NaturalSpawner.AfterSpawnCallback runner, int maxSpawns, Consumer<Entity> trackEntity) {
+    // Paper end - Optional per player mob spawns
         StructureManager structuremanager = world.structureManager();
         ChunkGenerator chunkgenerator = world.getChunkSource().getGenerator();
         int i = pos.getY();
@@ -268,9 +320,14 @@ public final class NaturalSpawner {
                                                 ++j;
                                                 ++k1;
                                                 runner.run(entityinsentient, chunk);
+                                                // Paper start - Optional per player mob spawns
+                                                if (trackEntity != null) {
+                                                    trackEntity.accept(entityinsentient);
+                                                }
+                                                // Paper end - Optional per player mob spawns
                                             }
                                             // CraftBukkit end
-                                            if (j >= entityinsentient.getMaxSpawnClusterSize()) {
+                                            if (j >= entityinsentient.getMaxSpawnClusterSize() || j >= maxSpawns) { // Paper - Optional per player mob spawns
                                                 return;
                                             }
 
@@ -543,7 +600,7 @@ public final class NaturalSpawner {
             MobCategory enumcreaturetype = entitytypes.getCategory();
 
             this.mobCategoryCounts.addTo(enumcreaturetype, 1);
-            this.localMobCapCalculator.addMob(new ChunkPos(blockposition), enumcreaturetype);
+            if (this.localMobCapCalculator != null) this.localMobCapCalculator.addMob(new ChunkPos(blockposition), enumcreaturetype); // Paper - Optional per player mob spawns
         }
 
         public int getSpawnableChunkCount() {