Paper/patches/server/0338-implement-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] implement optional per player mob spawns


diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
index 9b16464c4edf334093c9aa0bd164348197b96455..bd15131b7506e965bcf64be20330731256a1e1f0 100644
--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
@@ -289,6 +289,29 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
         });
     }
 
+    // Paper start
+    public void updatePlayerMobTypeMap(Entity entity) {
+        if (!this.level.paperConfig().entities.spawning.perPlayerMobSpawns) {
+            return;
+        }
+        int index = entity.getType().getCategory().ordinal();
+
+        final com.destroystokyo.paper.util.maplist.ReferenceList<ServerPlayer> inRange =
+            this.getNearbyPlayers().getPlayers(entity.chunkPosition(), io.papermc.paper.util.player.NearbyPlayers.NearbyMapType.TICK_VIEW_DISTANCE);
+        if (inRange == null) {
+            return;
+        }
+        final Object[] backingSet = inRange.getRawData();
+        for (int i = 0, len = inRange.size(); i < len; i++) {
+            ++((ServerPlayer)backingSet[i]).mobCounts[index];
+        }
+    }
+
+    public int getMobCountNear(ServerPlayer entityPlayer, net.minecraft.world.entity.MobCategory mobCategory) {
+        return entityPlayer.mobCounts[mobCategory.ordinal()];
+    }
+    // Paper end
+
     private static double euclideanDistanceSquared(ChunkPos pos, Entity entity) {
         double d0 = (double) SectionPos.sectionToBlockCoord(pos.x, 8);
         double d1 = (double) SectionPos.sectionToBlockCoord(pos.z, 8);
diff --git a/src/main/java/net/minecraft/server/level/ServerChunkCache.java b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
index 16028723b36c1ca3a3c5d1bf2a7c82d2b42a0be4..24d9a2c37db4bbf2585b33d06f5ea57eb2adf356 100644
--- a/src/main/java/net/minecraft/server/level/ServerChunkCache.java
+++ b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
@@ -549,7 +549,19 @@ public class ServerChunkCache extends ChunkSource {
                 gameprofilerfiller.popPush("naturalSpawnCount");
                 this.level.timings.countNaturalMobs.startTiming(); // Paper - timings
                 int k = this.distanceManager.getNaturalSpawnChunkCount();
-                NaturalSpawner.SpawnState spawnercreature_d = NaturalSpawner.createState(k, this.level.getAllEntities(), this::getFullChunk, new LocalMobCapCalculator(this.chunkMap));
+                // Paper start - per player mob spawning
+                int naturalSpawnChunkCount = k;
+                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
                 this.level.timings.countNaturalMobs.stopTiming(); // Paper - timings
 
                 this.lastSpawnState = spawnercreature_d;
diff --git a/src/main/java/net/minecraft/server/level/ServerPlayer.java b/src/main/java/net/minecraft/server/level/ServerPlayer.java
index 05c658b988fd970eeba8117d06c5a5d93b8fd75d..ad167cd343ec38f0263e634124036e741246c6b6 100644
--- a/src/main/java/net/minecraft/server/level/ServerPlayer.java
+++ b/src/main/java/net/minecraft/server/level/ServerPlayer.java
@@ -253,6 +253,10 @@ public class ServerPlayer extends Player {
     public boolean queueHealthUpdatePacket = false;
     public net.minecraft.network.protocol.game.ClientboundSetHealthPacket queuedHealthUpdatePacket;
     // Paper end
+    // Paper start - mob spawning rework
+    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 - mob spawning rework
 
     // CraftBukkit start
     public String displayName;
diff --git a/src/main/java/net/minecraft/world/level/NaturalSpawner.java b/src/main/java/net/minecraft/world/level/NaturalSpawner.java
index fe38079d69f3e9987ad5ab077ae09d05017a681a..9df761f5cf043e8d2dffa711c20ab32fe2992331 100644
--- a/src/main/java/net/minecraft/world/level/NaturalSpawner.java
+++ b/src/main/java/net/minecraft/world/level/NaturalSpawner.java
@@ -70,6 +70,12 @@ public final class NaturalSpawner {
     private NaturalSpawner() {}
 
     public static NaturalSpawner.SpawnState createState(int spawningChunkCount, Iterable<Entity> entities, NaturalSpawner.ChunkGetter chunkSource, LocalMobCapCalculator densityCapper) {
+        // Paper start - add countMobs parameter
+        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
         PotentialCalculator spawnercreatureprobabilities = new PotentialCalculator();
         Object2IntOpenHashMap<MobCategory> object2intopenhashmap = new Object2IntOpenHashMap();
         Iterator iterator = entities.iterator();
@@ -104,11 +110,16 @@ public final class NaturalSpawner {
                         spawnercreatureprobabilities.addCharge(entity.blockPosition(), biomesettingsmobs_b.charge());
                     }
 
-                    if (entity instanceof Mob) {
+                    if (densityCapper != null && entity instanceof Mob) { // Paper
                         densityCapper.addMob(chunk.getPos(), enumcreaturetype);
                     }
 
                     object2intopenhashmap.addTo(enumcreaturetype, 1);
+                    // Paper start
+                    if (countMobs) {
+                        chunk.level.getChunkSource().chunkMap.updatePlayerMobTypeMap(entity);
+                    }
+                    // Paper end
                 });
             }
         }
@@ -143,13 +154,35 @@ public final class NaturalSpawner {
                 continue;
             }
 
-            if ((spawnAnimals || !enumcreaturetype.isFriendly()) && (spawnMonsters || enumcreaturetype.isFriendly()) && (rareSpawn || !enumcreaturetype.isPersistent()) && info.canSpawnForCategory(enumcreaturetype, chunk.getPos(), limit)) {
+            // Paper start - only allow spawns upto the limit per chunk and update count afterwards
+            int currEntityCount = info.mobCategoryCounts.getInt(enumcreaturetype);
+            int k1 = limit * info.getSpawnableChunkCount() / NaturalSpawner.MAGIC_NUMBER;
+            int difference = k1 - currEntityCount;
+
+            if (world.paperConfig().entities.spawning.perPlayerMobSpawns) {
+                int minDiff = Integer.MAX_VALUE;
+                final com.destroystokyo.paper.util.maplist.ReferenceList<net.minecraft.server.level.ServerPlayer> inRange =
+                    world.chunkSource.chunkMap.getNearbyPlayers().getPlayers(chunk.getPos(), io.papermc.paper.util.player.NearbyPlayers.NearbyMapType.TICK_VIEW_DISTANCE);
+                if (inRange != null) {
+                    final Object[] backingSet = inRange.getRawData();
+                    for (int k = 0, len = inRange.size(); k < len; k++) {
+                        minDiff = Math.min(limit - world.getChunkSource().chunkMap.getMobCountNear((net.minecraft.server.level.ServerPlayer)backingSet[k], enumcreaturetype), minDiff);
+                    }
+                }
+                difference = (minDiff == Integer.MAX_VALUE) ? 0 : minDiff;
+            }
+            if ((spawnAnimals || !enumcreaturetype.isFriendly()) && (spawnMonsters || enumcreaturetype.isFriendly()) && (rareSpawn || !enumcreaturetype.isPersistent()) && difference > 0) {
+                // Paper end
                 // CraftBukkit end
                 Objects.requireNonNull(info);
                 NaturalSpawner.SpawnPredicate spawnercreature_c = info::canSpawn;
 
                 Objects.requireNonNull(info);
-                NaturalSpawner.spawnCategoryForChunk(enumcreaturetype, world, chunk, spawnercreature_c, info::afterSpawn);
+                // Paper start
+                int spawnCount = NaturalSpawner.spawnCategoryForChunk(enumcreaturetype, world, chunk, spawnercreature_c, info::afterSpawn,
+                    difference, world.paperConfig().entities.spawning.perPlayerMobSpawns ? world.getChunkSource().chunkMap::updatePlayerMobTypeMap : null);
+                info.mobCategoryCounts.mergeInt(enumcreaturetype, spawnCount, Integer::sum);
+                // Paper end
             }
         }
 
@@ -158,11 +191,17 @@ public final class NaturalSpawner {
     }
 
     public static void spawnCategoryForChunk(MobCategory group, ServerLevel world, LevelChunk chunk, NaturalSpawner.SpawnPredicate checker, NaturalSpawner.AfterSpawnCallback runner) {
+        // Paper start - add parameters and int ret type
+        spawnCategoryForChunk(group, world, chunk, checker, runner, Integer.MAX_VALUE, null);
+    }
+    public static int spawnCategoryForChunk(MobCategory group, ServerLevel world, LevelChunk chunk, NaturalSpawner.SpawnPredicate checker, NaturalSpawner.AfterSpawnCallback runner, int maxSpawns, Consumer<Entity> trackEntity) {
+        // Paper end - add parameters and int ret type
         BlockPos blockposition = NaturalSpawner.getRandomPosWithin(world, chunk);
 
         if (blockposition.getY() >= world.getMinBuildHeight() + 1) {
-            NaturalSpawner.spawnCategoryForPosition(group, world, chunk, blockposition, checker, runner);
+            return NaturalSpawner.spawnCategoryForPosition(group, world, chunk, blockposition, checker, runner, maxSpawns, trackEntity); // Paper
         }
+        return 0; // Paper
     }
 
     @VisibleForDebug
@@ -173,15 +212,21 @@ public final class NaturalSpawner {
         });
     }
 
+    // Paper start - add maxSpawns parameter and return spawned mobs
     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 int spawnCategoryForPosition(MobCategory group, ServerLevel world, ChunkAccess chunk, BlockPos pos, NaturalSpawner.SpawnPredicate checker, NaturalSpawner.AfterSpawnCallback runner, int maxSpawns, Consumer<Entity> trackEntity) {
+    // Paper end - add maxSpawns parameter and return spawned mobs
         StructureManager structuremanager = world.structureManager();
         ChunkGenerator chunkgenerator = world.getChunkSource().getGenerator();
         int i = pos.getY();
         BlockState iblockdata = world.getBlockStateIfLoadedAndInBounds(pos); // Paper - don't load chunks for mob spawn
+        int j = 0; // Paper - moved up
 
         if (iblockdata != null && !iblockdata.isRedstoneConductor(chunk, pos)) { // Paper - don't load chunks for mob spawn
             BlockPos.MutableBlockPos blockposition_mutableblockposition = new BlockPos.MutableBlockPos();
-            int j = 0;
+            //int j = 0; // Paper - moved up
             int k = 0;
 
             while (k < 3) {
@@ -223,14 +268,14 @@ public final class NaturalSpawner {
                                     // Paper start
                                     PreSpawnStatus doSpawning = isValidSpawnPostitionForType(world, group, structuremanager, chunkgenerator, biomesettingsmobs_c, blockposition_mutableblockposition, d2);
                                     if (doSpawning == PreSpawnStatus.ABORT) {
-                                        return;
+                                        return j; // Paper
                                     }
                                     if (doSpawning == PreSpawnStatus.SUCCESS && checker.test(biomesettingsmobs_c.type, blockposition_mutableblockposition, chunk)) {
                                         // Paper end
                                         Mob entityinsentient = NaturalSpawner.getMobForSpawn(world, biomesettingsmobs_c.type);
 
                                         if (entityinsentient == null) {
-                                            return;
+                                            return j; // Paper
                                         }
 
                                         entityinsentient.moveTo(d0, (double) i, d1, world.random.nextFloat() * 360.0F, 0.0F);
@@ -243,10 +288,15 @@ public final class NaturalSpawner {
                                                 ++j;
                                                 ++k1;
                                                 runner.run(entityinsentient, chunk);
+                                                // Paper start
+                                                if (trackEntity != null) {
+                                                    trackEntity.accept(entityinsentient);
+                                                }
+                                                // Paper end
                                             }
                                             // CraftBukkit end
-                                            if (j >= entityinsentient.getMaxSpawnClusterSize()) {
-                                                return;
+                                            if (j >= entityinsentient.getMaxSpawnClusterSize() || j >= maxSpawns) { // Paper
+                                                return j; // Paper
                                             }
 
                                             if (entityinsentient.isMaxGroupSizeReached(k1)) {
@@ -268,6 +318,7 @@ public final class NaturalSpawner {
             }
 
         }
+        return j; // Paper
     }
 
     private static boolean isRightDistanceToPlayerAndSpawnPoint(ServerLevel world, ChunkAccess chunk, BlockPos.MutableBlockPos pos, double squaredDistance) {
@@ -567,7 +618,7 @@ 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
         }
 
         public int getSpawnableChunkCount() {
@@ -583,6 +634,7 @@ public final class NaturalSpawner {
             int i = limit * this.spawnableChunkCount / NaturalSpawner.MAGIC_NUMBER;
             // CraftBukkit end
 
+            if (this.localMobCapCalculator == null) return this.mobCategoryCounts.getInt(enumcreaturetype) < i; // Paper
             return this.mobCategoryCounts.getInt(enumcreaturetype) >= i ? false : this.localMobCapCalculator.canSpawn(enumcreaturetype, chunkcoordintpair);
         }
     }