Paper/CraftBukkit-Patches/0018-Entity-Tracking-Ranges.patch

From 98c2490b9e0db5dbcaf154bdc8d2bcba1676a2ff Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Wed, 20 Feb 2013 11:58:47 -0500
Subject: [PATCH] Entity Tracking Ranges

This will let you configure how far to track entities in range from players, so that the entity does not render on the client if out of this range.
This has multiple benefits:

1) Less bandwidth. Not sending update packets for entities that are not even close to a player, or even close enough to clearly see.
2) Less lag by maps in item frames - Default range is 160 blocks... Many players can track that item frame and cause lag and not even see it.
3) Less lag in general - Less work for the server to do
4) Less client lag - Not trying to render distant item frames and paintings and entities will reduce entity count on the client, which is major for shop/town worlds which may use tons of item frames.

diff --git a/src/main/java/net/minecraft/server/EntityTracker.java b/src/main/java/net/minecraft/server/EntityTracker.java
index e1ff4f0..cb72b36 100644
--- a/src/main/java/net/minecraft/server/EntityTracker.java
+++ b/src/main/java/net/minecraft/server/EntityTracker.java
@@ -95,6 +95,7 @@ public class EntityTracker {
 
     public void addEntity(Entity entity, int i, final int j, boolean flag) {
         org.spigotmc.AsyncCatcher.catchOp( "entity track"); // Spigot
+        i = org.spigotmc.TrackingRange.getEntityTrackingRange(entity, i); // Spigot
         if (i > this.e) {
             i = this.e;
         }
diff --git a/src/main/java/org/spigotmc/ActivationRange.java b/src/main/java/org/spigotmc/ActivationRange.java
index d3f4af1..0143623 100644
--- a/src/main/java/org/spigotmc/ActivationRange.java
+++ b/src/main/java/org/spigotmc/ActivationRange.java
@@ -106,7 +106,7 @@ public class ActivationRange
         maxRange = Math.max( maxRange, miscActivationRange );
         maxRange = Math.min( ( world.spigotConfig.viewDistance << 4 ) - 8, maxRange );
 
-        for ( Entity player : (List<Entity>) world.players )
+        for ( Entity player : (List<Entity>) (List) world.players )
         {
 
             player.activatedTick = MinecraftServer.currentTick;
@@ -188,7 +188,7 @@ public class ActivationRange
     public static boolean checkEntityImmunities(Entity entity)
     {
         // quick checks.
-        if ( entity.inWater /* isInWater */ || entity.fireTicks > 0 )
+        if ( entity.inWater || entity.fireTicks > 0 )
         {
             return true;
         }
@@ -215,14 +215,14 @@ public class ActivationRange
             {
                 return true;
             }
-            if ( entity instanceof EntityVillager && ( (EntityVillager) entity ).ck() /* Getter for first boolean */ )
+            if ( entity instanceof EntityVillager && ( (EntityVillager) entity ).cm() /* Getter for first boolean */ )
             {
                 return true;
             }
             if ( entity instanceof EntityAnimal )
             {
                 EntityAnimal animal = (EntityAnimal) entity;
-                if ( animal.isBaby() || animal.cp() /*love*/ )
+                if ( animal.isBaby() || animal.isInLove() )
                 {
                     return true;
                 }
diff --git a/src/main/java/org/spigotmc/SpigotWorldConfig.java b/src/main/java/org/spigotmc/SpigotWorldConfig.java
index da8563b..3d4896b 100644
--- a/src/main/java/org/spigotmc/SpigotWorldConfig.java
+++ b/src/main/java/org/spigotmc/SpigotWorldConfig.java
@@ -151,4 +151,19 @@ public class SpigotWorldConfig
         miscActivationRange = getInt( "entity-activation-range.misc", miscActivationRange );
         log( "Entity Activation Range: An " + animalActivationRange + " / Mo " + monsterActivationRange + " / Mi " + miscActivationRange );
     }
+
+    public int playerTrackingRange = 48;
+    public int animalTrackingRange = 48;
+    public int monsterTrackingRange = 48;
+    public int miscTrackingRange = 32;
+    public int otherTrackingRange = 64;
+    private void trackingRange()
+    {
+        playerTrackingRange = getInt( "entity-tracking-range.players", playerTrackingRange );
+        animalTrackingRange = getInt( "entity-tracking-range.animals", animalTrackingRange );
+        monsterTrackingRange = getInt( "entity-tracking-range.monsters", monsterTrackingRange );
+        miscTrackingRange = getInt( "entity-tracking-range.misc", miscTrackingRange );
+        otherTrackingRange = getInt( "entity-tracking-range.other", otherTrackingRange );
+        log( "Entity Tracking Range: Pl " + playerTrackingRange + " / An " + animalTrackingRange + " / Mo " + monsterTrackingRange + " / Mi " + miscTrackingRange + " / Other " + otherTrackingRange );
+    }
 }
diff --git a/src/main/java/org/spigotmc/TrackingRange.java b/src/main/java/org/spigotmc/TrackingRange.java
new file mode 100644
index 0000000..4bf4d2a
--- /dev/null
+++ b/src/main/java/org/spigotmc/TrackingRange.java
@@ -0,0 +1,51 @@
+package org.spigotmc;
+
+import net.minecraft.server.Entity;
+import net.minecraft.server.EntityExperienceOrb;
+import net.minecraft.server.EntityGhast;
+import net.minecraft.server.EntityItem;
+import net.minecraft.server.EntityItemFrame;
+import net.minecraft.server.EntityPainting;
+import net.minecraft.server.EntityPlayer;
+
+public class TrackingRange
+{
+
+    /**
+     * Gets the range an entity should be 'tracked' by players and visible in
+     * the client.
+     *
+     * @param entity
+     * @param defaultRange Default range defined by Mojang
+     * @return
+     */
+    public static int getEntityTrackingRange(Entity entity, int defaultRange)
+    {
+        SpigotWorldConfig config = entity.world.spigotConfig;
+        if ( entity instanceof EntityPlayer )
+        {
+            return config.playerTrackingRange;
+        }  else if ( entity.activationType == 1 )
+        {
+            return config.monsterTrackingRange;
+        } else if ( entity instanceof EntityGhast )
+        {
+            if ( config.monsterTrackingRange > config.monsterActivationRange )
+            {
+                return config.monsterTrackingRange;
+            } else
+            {
+                return config.monsterActivationRange;
+            }
+        } else if ( entity.activationType == 2 )
+        {
+            return config.animalTrackingRange;
+        } else if ( entity instanceof EntityItemFrame || entity instanceof EntityPainting || entity instanceof EntityItem || entity instanceof EntityExperienceOrb )
+        {
+            return config.miscTrackingRange;
+        } else 
+        {
+            return config.otherTrackingRange;
+        }
+    }
+}
-- 
2.1.4