PaperMC/CraftBukkit-Patches/0040-Entity-Tracking-Ranges.patch

From f236d3d8b27a9127905563e20c58ac512268e9dc 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.
---
 .../java/net/minecraft/server/EntityTracker.java   |  1 +
 .../java/org/bukkit/craftbukkit/CraftWorld.java    | 21 +++++++++++++++++
 src/main/java/org/bukkit/craftbukkit/Spigot.java   | 26 ++++++++++++++++++++++
 src/main/resources/configurations/bukkit.yml       |  5 +++++
 4 files changed, 53 insertions(+)

diff --git a/src/main/java/net/minecraft/server/EntityTracker.java b/src/main/java/net/minecraft/server/EntityTracker.java
index 4de1273..0bc3733 100644
--- a/src/main/java/net/minecraft/server/EntityTracker.java
+++ b/src/main/java/net/minecraft/server/EntityTracker.java
@@ -89,6 +89,7 @@ public class EntityTracker {
     }
 
     public void addEntity(Entity entity, int i, int j, boolean flag) {
+        i = org.bukkit.craftbukkit.Spigot.getEntityTrackingRange(entity, i); // Spigot
         if (i > this.d) {
             i = this.d;
         }
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 3bfc669..804da57 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -106,6 +106,12 @@ public class CraftWorld implements World {
         animalEntityActivationRange = configuration.getInt("world-settings.default.entity-activation-range-animals");
         monsterEntityActivationRange = configuration.getInt("world-settings.default.entity-activation-range-monsters");
 
+        playerTrackingRange = configuration.getInt("world-settings.default.entity-tracking-range-players");
+        miscTrackingRange = configuration.getInt("world-settings.default.entity-tracking-range-misc");
+        animalTrackingRange = configuration.getInt("world-settings.default.entity-tracking-range-animals");
+        monsterTrackingRange = configuration.getInt("world-settings.default.entity-tracking-range-monsters");
+        maxTrackingRange = configuration.getInt("world-settings.default.entity-tracking-range-max");
+        
         //override defaults with world specific, if they exist
         growthPerTick = configuration.getInt("world-settings." + name + ".growth-chunks-per-tick", growthPerTick);
         itemMergeRadius = configuration.getDouble("world-settings." + name + ".item-merge-radius", itemMergeRadius);
@@ -133,6 +139,14 @@ public class CraftWorld implements World {
         animalEntityActivationRange = configuration.getInt("world-settings." + name + ".entity-activation-range-animals", animalEntityActivationRange);
         monsterEntityActivationRange = configuration.getInt("world-settings." + name + ".entity-activation-range-monsters", monsterEntityActivationRange);
 
+        maxTrackingRange = configuration.getInt("world-settings." + name + ".entity-tracking-range-max", maxTrackingRange);
+        playerTrackingRange = Math.min(maxTrackingRange, configuration.getInt("world-settings." + name + ".entity-tracking-range-players", playerTrackingRange));
+        miscTrackingRange = Math.min(maxTrackingRange, configuration.getInt("world-settings." + name + ".entity-tracking-range-misc", miscTrackingRange));
+        animalTrackingRange = Math.min(maxTrackingRange, configuration.getInt("world-settings." + name + ".entity-tracking-range-animals", animalTrackingRange));
+        monsterTrackingRange = Math.min(maxTrackingRange, configuration.getInt("world-settings." + name + ".entity-tracking-range-monsters", monsterTrackingRange));
+        if (maxTrackingRange == 0) {
+            System.err.println("Error! Should not have 0 maxRange");
+        }
         server.getLogger().info("-------------- Spigot ----------------");
         server.getLogger().info("-------- World Settings For [" + name + "] --------");
         server.getLogger().info("Growth Per Chunk: " + growthPerTick);
@@ -149,6 +163,7 @@ public class CraftWorld implements World {
         server.getLogger().info("View distance: " + viewDistance);
         server.getLogger().info("Oreobfuscator: " + obfuscated);
         server.getLogger().info("Entity Activation Range: An " + animalEntityActivationRange + " / Mo " + monsterEntityActivationRange + " / Mi " + miscEntityActivationRange);
+        server.getLogger().info("Entity Tracking Range: Pl " + playerTrackingRange + " / An " + animalTrackingRange + " / Mo " + monsterTrackingRange + " / Mi " + miscTrackingRange + " / Max " + maxTrackingRange);
         server.getLogger().info("-------------------------------------------------");
         // Spigot end
     }
@@ -173,6 +188,12 @@ public class CraftWorld implements World {
     public int miscEntityActivationRange = 16;
     public int animalEntityActivationRange = 32;
     public int monsterEntityActivationRange = 32;
+
+    public int playerTrackingRange = 64;
+    public int miscTrackingRange = 32;
+    public int animalTrackingRange = 48;
+    public int monsterTrackingRange = 48;
+    public int maxTrackingRange = 64;
     // Spigot end
 
     public Block getBlockAt(int x, int y, int z) {
diff --git a/src/main/java/org/bukkit/craftbukkit/Spigot.java b/src/main/java/org/bukkit/craftbukkit/Spigot.java
index 4b355c9..f3e9e79 100644
--- a/src/main/java/org/bukkit/craftbukkit/Spigot.java
+++ b/src/main/java/org/bukkit/craftbukkit/Spigot.java
@@ -338,4 +338,30 @@ public class Spigot {
             ex.printStackTrace();
         }
     }
+
+    /**
+     * 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) {
+        CraftWorld world = entity.world.getWorld();
+        int range = defaultRange;
+        if (entity instanceof EntityPlayer) {
+            range = world.playerTrackingRange;
+        } else if (entity.defaultActivationState || entity instanceof EntityGhast) {
+            range = defaultRange;
+        } else if (entity.activationType == 1) {
+            range = world.monsterEntityActivationRange;
+        } else if (entity.activationType == 2) {
+            range = world.animalTrackingRange;
+        } else if (entity instanceof EntityItemFrame || entity instanceof EntityPainting || entity instanceof EntityItem || entity instanceof EntityExperienceOrb) {
+            range = world.miscTrackingRange;
+        }
+        if (range == 0) {
+            return defaultRange;
+        }
+        return Math.min(world.maxTrackingRange, range);
+    }
 }
diff --git a/src/main/resources/configurations/bukkit.yml b/src/main/resources/configurations/bukkit.yml
index 472b36b..de93708 100644
--- a/src/main/resources/configurations/bukkit.yml
+++ b/src/main/resources/configurations/bukkit.yml
@@ -53,6 +53,11 @@ world-settings:
         entity-activation-range-animals: 32
         entity-activation-range-monsters: 32
         entity-activation-range-misc: 16
+        entity-tracking-range-players: 48
+        entity-tracking-range-animals: 48
+        entity-tracking-range-monsters: 48
+        entity-tracking-range-misc: 32
+        entity-tracking-range-max: 64
     world:
         growth-chunks-per-tick: 1000
     world_nether:
-- 
1.8.1-rc2