Paper/CraftBukkit-Patches/0018-Entity-Activation-Range.patch

From 825f177a357447c0542949b349e839fee21c50ce Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sun, 3 Feb 2013 05:10:21 -0500
Subject: [PATCH] Entity Activation Range

This feature gives 3 new configurable ranges that if an entity of the matching type is outside of this radius of any player, will tick at 5% of its normal rate.

This will drastically cut down on tick timings for entities that are not in range of a user to actually be "used".
This change can have dramatic impact on gameplay if configured too low. Balance according to your servers desired gameplay.

diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
index 3d6aeff..3e3d935 100644
--- a/src/main/java/net/minecraft/server/Entity.java
+++ b/src/main/java/net/minecraft/server/Entity.java
@@ -88,7 +88,7 @@ public abstract class Entity {
     public int ticksLived;
     public int maxFireTicks;
     public int fireTicks; // CraftBukkit - private -> public
-    protected boolean inWater;
+    public boolean inWater; // Spigot - protected -> public
     public int noDamageTicks;
     private boolean justCreated;
     protected boolean fireProof;
@@ -111,7 +111,13 @@ public abstract class Entity {
     public EnumEntitySize at;
     public boolean valid; // CraftBukkit
 
+    // Spigot start
     public CustomTimingsHandler tickTimer = org.bukkit.craftbukkit.SpigotTimings.getEntityTimings(this); // Spigot
+    public final byte activationType = org.spigotmc.ActivationRange.initializeEntityActivationType(this);
+    public final boolean defaultActivationState;
+    public long activatedTick = 0;
+    public void inactiveTick() { }
+    // Spigot end
 
     public int getId() {
         return this.id;
@@ -138,7 +144,12 @@ public abstract class Entity {
         this.setPosition(0.0D, 0.0D, 0.0D);
         if (world != null) {
             this.dimension = world.worldProvider.dimension;
+            // Spigot start
+            this.defaultActivationState = org.spigotmc.ActivationRange.initializeEntityActivationState(this, world.spigotConfig);
+        } else {
+            this.defaultActivationState = false;
         }
+        // Spigot end
 
         this.datawatcher = new DataWatcher(this);
         this.datawatcher.a(0, Byte.valueOf((byte) 0));
diff --git a/src/main/java/net/minecraft/server/EntityAgeable.java b/src/main/java/net/minecraft/server/EntityAgeable.java
index 36ed831..7ddca48 100644
--- a/src/main/java/net/minecraft/server/EntityAgeable.java
+++ b/src/main/java/net/minecraft/server/EntityAgeable.java
@@ -6,6 +6,31 @@ public abstract class EntityAgeable extends EntityCreature {
     private float bq;
     public boolean ageLocked = false; // CraftBukkit
 
+    // Spigot start
+    @Override
+    public void inactiveTick()
+    {
+        super.inactiveTick();
+        if ( this.world.isStatic || this.ageLocked )
+        { // CraftBukkit
+            this.a( this.isBaby() );
+        } else
+        {
+            int i = this.getAge();
+
+            if ( i < 0 )
+            {
+                ++i;
+                this.setAge( i );
+            } else if ( i > 0 )
+            {
+                --i;
+                this.setAge( i );
+            }
+        }
+    }
+    // Spigot end
+
     public EntityAgeable(World world) {
         super(world);
     }
diff --git a/src/main/java/net/minecraft/server/EntityArrow.java b/src/main/java/net/minecraft/server/EntityArrow.java
index 4b3e5dd..3fd3de9 100644
--- a/src/main/java/net/minecraft/server/EntityArrow.java
+++ b/src/main/java/net/minecraft/server/EntityArrow.java
@@ -14,7 +14,7 @@ public class EntityArrow extends Entity implements IProjectile {
     private int f = -1;
     private Block g;
     private int h;
-    private boolean inGround;
+    public boolean inGround = false; // Spigot - private -> public
     public int fromPlayer;
     public int shake;
     public Entity shooter;
diff --git a/src/main/java/net/minecraft/server/EntityLiving.java b/src/main/java/net/minecraft/server/EntityLiving.java
index 7211da8..d06ec7b 100644
--- a/src/main/java/net/minecraft/server/EntityLiving.java
+++ b/src/main/java/net/minecraft/server/EntityLiving.java
@@ -78,6 +78,13 @@ public abstract class EntityLiving extends Entity {
     public int expToDrop;
     public int maxAirTicks = 300;
     // CraftBukkit end
+    // Spigot start
+    public void inactiveTick()
+    {
+        super.inactiveTick();
+        ++this.aV;
+    }
+    // Spigot end
 
     public EntityLiving(World world) {
         super(world);
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 5a368a0..2cc9005 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -1234,6 +1234,7 @@ public abstract class World implements IBlockAccess {
         this.f.clear();
         this.methodProfiler.c("regular");
 
+        org.spigotmc.ActivationRange.activateEntities(this); // Spigot
         timings.entityTick.startTiming(); // Spigot
         for (i = 0; i < this.entityList.size(); ++i) {
             entity = (Entity) this.entityList.get(i);
@@ -1394,7 +1395,11 @@ public abstract class World implements IBlockAccess {
         int j = MathHelper.floor(entity.locZ);
         byte b0 = 32;
 
-        if (!flag || this.b(i - b0, 0, j - b0, i + b0, 0, j + b0)) {
+        // Spigot start
+        if (!org.spigotmc.ActivationRange.checkIfActive(entity)) {
+            entity.ticksLived++;
+            entity.inactiveTick();
+        } else {
             entity.tickTimer.startTiming(); // Spigot
             entity.T = entity.locX;
             entity.U = entity.locY;
diff --git a/src/main/java/org/bukkit/craftbukkit/SpigotTimings.java b/src/main/java/org/bukkit/craftbukkit/SpigotTimings.java
index 8340c13..541dfe4 100644
--- a/src/main/java/org/bukkit/craftbukkit/SpigotTimings.java
+++ b/src/main/java/org/bukkit/craftbukkit/SpigotTimings.java
@@ -30,6 +30,9 @@ public class SpigotTimings {
 
     public static final CustomTimingsHandler playerCommandTimer = new CustomTimingsHandler("** playerCommand");
 
+    public static final CustomTimingsHandler entityActivationCheckTimer = new CustomTimingsHandler("entityActivationCheck");
+    public static final CustomTimingsHandler checkIfActiveTimer = new CustomTimingsHandler("** checkIfActive");
+
     public static final HashMap<String, CustomTimingsHandler> entityTypeTimingMap = new HashMap<String, CustomTimingsHandler>();
     public static final HashMap<String, CustomTimingsHandler> tileEntityTypeTimingMap = new HashMap<String, CustomTimingsHandler>();
     public static final HashMap<String, CustomTimingsHandler> pluginTaskTimingMap = new HashMap<String, CustomTimingsHandler>();
diff --git a/src/main/java/org/spigotmc/ActivationRange.java b/src/main/java/org/spigotmc/ActivationRange.java
new file mode 100644
index 0000000..db4c927
--- /dev/null
+++ b/src/main/java/org/spigotmc/ActivationRange.java
@@ -0,0 +1,296 @@
+package org.spigotmc;
+
+import java.util.ArrayList;
+import java.util.List;
+import net.minecraft.server.AxisAlignedBB;
+import net.minecraft.server.Chunk;
+import net.minecraft.server.Entity;
+import net.minecraft.server.EntityAmbient;
+import net.minecraft.server.EntityAnimal;
+import net.minecraft.server.EntityArrow;
+import net.minecraft.server.EntityComplexPart;
+import net.minecraft.server.EntityCreature;
+import net.minecraft.server.EntityEnderCrystal;
+import net.minecraft.server.EntityEnderDragon;
+import net.minecraft.server.EntityFireball;
+import net.minecraft.server.EntityFireworks;
+import net.minecraft.server.EntityHuman;
+import net.minecraft.server.EntityLiving;
+import net.minecraft.server.EntityMonster;
+import net.minecraft.server.EntityProjectile;
+import net.minecraft.server.EntitySheep;
+import net.minecraft.server.EntitySlime;
+import net.minecraft.server.EntityTNTPrimed;
+import net.minecraft.server.EntityVillager;
+import net.minecraft.server.EntityWeather;
+import net.minecraft.server.EntityWither;
+import net.minecraft.server.MathHelper;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.World;
+import org.bukkit.craftbukkit.CraftWorld;
+import org.bukkit.craftbukkit.SpigotTimings;
+
+public class ActivationRange
+{
+
+    static AxisAlignedBB maxBB = AxisAlignedBB.a( 0, 0, 0, 0, 0, 0 );
+    static AxisAlignedBB miscBB = AxisAlignedBB.a( 0, 0, 0, 0, 0, 0 );
+    static AxisAlignedBB animalBB = AxisAlignedBB.a( 0, 0, 0, 0, 0, 0 );
+    static AxisAlignedBB monsterBB = AxisAlignedBB.a( 0, 0, 0, 0, 0, 0 );
+
+    /**
+     * Initializes an entities type on construction to specify what group this
+     * entity is in for activation ranges.
+     *
+     * @param entity
+     * @return group id
+     */
+    public static byte initializeEntityActivationType(Entity entity)
+    {
+        if ( entity instanceof EntityMonster || entity instanceof EntitySlime )
+        {
+            return 1; // Monster
+        } else if ( entity instanceof EntityCreature || entity instanceof EntityAmbient )
+        {
+            return 2; // Animal
+        } else
+        {
+            return 3; // Misc
+        }
+    }
+
+    /**
+     * These entities are excluded from Activation range checks.
+     *
+     * @param entity
+     * @param world
+     * @return boolean If it should always tick.
+     */
+    public static boolean initializeEntityActivationState(Entity entity, SpigotWorldConfig config)
+    {
+        if ( ( entity.activationType == 3 && config.miscActivationRange == 0 )
+                || ( entity.activationType == 2 && config.animalActivationRange == 0 )
+                || ( entity.activationType == 1 && config.monsterActivationRange == 0 )
+                || entity instanceof EntityHuman
+                || entity instanceof EntityProjectile
+                || entity instanceof EntityEnderDragon
+                || entity instanceof EntityComplexPart
+                || entity instanceof EntityWither
+                || entity instanceof EntityFireball
+                || entity instanceof EntityWeather
+                || entity instanceof EntityTNTPrimed
+                || entity instanceof EntityEnderCrystal
+                || entity instanceof EntityFireworks )
+        {
+            return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Utility method to grow an AABB without creating a new AABB or touching
+     * the pool, so we can re-use ones we have.
+     *
+     * @param target
+     * @param source
+     * @param x
+     * @param y
+     * @param z
+     */
+    public static void growBB(AxisAlignedBB target, AxisAlignedBB source, int x, int y, int z)
+    {
+        target.a = source.a - x;
+        target.b = source.b - y;
+        target.c = source.c - z;
+        target.d = source.d + x;
+        target.e = source.e + y;
+        target.f = source.f + z;
+    }
+
+    /**
+     * Find what entities are in range of the players in the world and set
+     * active if in range.
+     *
+     * @param world
+     */
+    public static void activateEntities(World world)
+    {
+        SpigotTimings.entityActivationCheckTimer.startTiming();
+        final int miscActivationRange = world.spigotConfig.miscActivationRange;
+        final int animalActivationRange = world.spigotConfig.animalActivationRange;
+        final int monsterActivationRange = world.spigotConfig.monsterActivationRange;
+
+        int maxRange = Math.max( monsterActivationRange, animalActivationRange );
+        maxRange = Math.max( maxRange, miscActivationRange );
+        maxRange = Math.min( ( world.spigotConfig.viewDistance << 4 ) - 8, maxRange );
+
+        for ( Entity player : new ArrayList<Entity>( world.players ) )
+        {
+
+            player.activatedTick = MinecraftServer.currentTick;
+            growBB( maxBB, player.boundingBox, maxRange, 256, maxRange );
+            growBB( miscBB, player.boundingBox, miscActivationRange, 256, miscActivationRange );
+            growBB( animalBB, player.boundingBox, animalActivationRange, 256, animalActivationRange );
+            growBB( monsterBB, player.boundingBox, monsterActivationRange, 256, monsterActivationRange );
+
+            int i = MathHelper.floor( maxBB.a / 16.0D );
+            int j = MathHelper.floor( maxBB.d / 16.0D );
+            int k = MathHelper.floor( maxBB.c / 16.0D );
+            int l = MathHelper.floor( maxBB.f / 16.0D );
+
+            for ( int i1 = i; i1 <= j; ++i1 )
+            {
+                for ( int j1 = k; j1 <= l; ++j1 )
+                {
+                    if ( world.getWorld().isChunkLoaded( i1, j1 ) )
+                    {
+                        activateChunkEntities( world.getChunkAt( i1, j1 ) );
+                    }
+                }
+            }
+        }
+        SpigotTimings.entityActivationCheckTimer.stopTiming();
+    }
+
+    /**
+     * Checks for the activation state of all entities in this chunk.
+     *
+     * @param chunk
+     */
+    private static void activateChunkEntities(Chunk chunk)
+    {
+        for ( List<Entity> slice : chunk.entitySlices )
+        {
+            for ( Entity entity : slice )
+            {
+                if ( MinecraftServer.currentTick > entity.activatedTick )
+                {
+                    if ( entity.defaultActivationState )
+                    {
+                        entity.activatedTick = MinecraftServer.currentTick;
+                        continue;
+                    }
+                    switch ( entity.activationType )
+                    {
+                        case 1:
+                            if ( monsterBB.b( entity.boundingBox ) )
+                            {
+                                entity.activatedTick = MinecraftServer.currentTick;
+                            }
+                            break;
+                        case 2:
+                            if ( animalBB.b( entity.boundingBox ) )
+                            {
+                                entity.activatedTick = MinecraftServer.currentTick;
+                            }
+                            break;
+                        case 3:
+                        default:
+                            if ( miscBB.b( entity.boundingBox ) )
+                            {
+                                entity.activatedTick = MinecraftServer.currentTick;
+                            }
+                    }
+                }
+            }
+        }
+    }
+
+    /**
+     * If an entity is not in range, do some more checks to see if we should
+     * give it a shot.
+     *
+     * @param entity
+     * @return
+     */
+    public static boolean checkEntityImmunities(Entity entity)
+    {
+        // quick checks.
+        if ( entity.inWater /* isInWater */ || entity.fireTicks > 0 )
+        {
+            return true;
+        }
+        if ( !( entity instanceof EntityArrow ) )
+        {
+            if ( !entity.onGround || entity.passenger != null
+                    || entity.vehicle != null )
+            {
+                return true;
+            }
+        } else if ( !( (EntityArrow) entity ).inGround )
+        {
+            return true;
+        }
+        // special cases.
+        if ( entity instanceof EntityLiving )
+        {
+            EntityLiving living = (EntityLiving) entity;
+            if ( living.attackTicks > 0 || living.hurtTicks > 0 || living.effects.size() > 0 )
+            {
+                return true;
+            }
+            if ( entity instanceof EntityCreature && ( (EntityCreature) entity ).target != null )
+            {
+                return true;
+            }
+            if ( entity instanceof EntityVillager && ( (EntityVillager) entity ).bY() /* Getter for first boolean */ )
+            {
+                return true;
+            }
+            if ( entity instanceof EntityAnimal )
+            {
+                EntityAnimal animal = (EntityAnimal) entity;
+                if ( animal.isBaby() || animal.cc() /*love*/ )
+                {
+                    return true;
+                }
+                if ( entity instanceof EntitySheep && ( (EntitySheep) entity ).isSheared() )
+                {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Checks if the entity is active for this tick.
+     *
+     * @param entity
+     * @return
+     */
+    public static boolean checkIfActive(Entity entity)
+    {
+        SpigotTimings.checkIfActiveTimer.startTiming();
+        boolean isActive = entity.activatedTick >= MinecraftServer.currentTick || entity.defaultActivationState;
+
+        // Should this entity tick?
+        if ( !isActive )
+        {
+            if ( ( MinecraftServer.currentTick - entity.activatedTick - 1 ) % 20 == 0 )
+            {
+                // Check immunities every 20 ticks.
+                if ( checkEntityImmunities( entity ) )
+                {
+                    // Triggered some sort of immunity, give 20 full ticks before we check again.
+                    entity.activatedTick = MinecraftServer.currentTick + 20;
+                }
+                isActive = true;
+            }
+            // Add a little performance juice to active entities. Skip 1/4 if not immune.
+        } else if ( !entity.defaultActivationState && entity.ticksLived % 4 == 0 && !checkEntityImmunities( entity ) )
+        {
+            isActive = false;
+        }
+        int x = MathHelper.floor( entity.locX );
+        int z = MathHelper.floor( entity.locZ );
+        // Make sure not on edge of unloaded chunk
+        if ( isActive && !entity.world.areChunksLoaded( x, 0, z, 16 ) )
+        {
+            isActive = false;
+        }
+        SpigotTimings.checkIfActiveTimer.stopTiming();
+        return isActive;
+    }
+}
diff --git a/src/main/java/org/spigotmc/SpigotWorldConfig.java b/src/main/java/org/spigotmc/SpigotWorldConfig.java
index 49a5b7a..1d95207 100644
--- a/src/main/java/org/spigotmc/SpigotWorldConfig.java
+++ b/src/main/java/org/spigotmc/SpigotWorldConfig.java
@@ -138,4 +138,15 @@ public class SpigotWorldConfig
         mobSpawnRange = (byte) getInt( "mob-spawn-range", 4 );
         log( "Mob Spawn Range: " + mobSpawnRange );
     }
+
+    public int animalActivationRange = 32;
+    public int monsterActivationRange = 32;
+    public int miscActivationRange = 16;
+    private void activationRange()
+    {
+        animalActivationRange = getInt( "entity-activation-range.animals", animalActivationRange );
+        monsterActivationRange = getInt( "entity-activation-range.monsters", monsterActivationRange );
+        miscActivationRange = getInt( "entity-activation-range.misc", miscActivationRange );
+        log( "Entity Activation Range: An " + animalActivationRange + " / Mo " + monsterActivationRange + " / Mi " + miscActivationRange );
+    }
 }
-- 
1.8.3.2