From 643de0c922473f9ee721be207a024676121294de Mon Sep 17 00:00:00 2001
From: Remie Richards <toiletbrush95@gmail.com>
Date: Sat, 7 Mar 2015 18:46:02 +0000
Subject: [PATCH] Hostile mobs no longer run all their hostile
 targeting/hunting code if there is nobody (or item, for those that hunt
 items) near them, they simply move to a simpler loop that decides whether to
 let the main loop continue.

---
 code/__DEFINES/combat.dm                      |  7 ++++
 .../living/simple_animal/hostile/hostile.dm   | 38 ++++++++++++++++++-
 2 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/code/__DEFINES/combat.dm b/code/__DEFINES/combat.dm
index e9b5c883731..bee34b9d2c9 100644
--- a/code/__DEFINES/combat.dm
+++ b/code/__DEFINES/combat.dm
@@ -44,12 +44,19 @@
 #define GRAB_UPGRADING	4
 #define GRAB_KILL		5
 
+
+//Hostile Mob Stances
 #define HOSTILE_STANCE_IDLE			1
 //#define HOSTILE_STANCE_ALERT		2 //Was only used by bears
 #define HOSTILE_STANCE_ATTACK		3
 #define HOSTILE_STANCE_ATTACKING	4
 //#define HOSTILE_STANCE_TIRED		5 //Was also only used by bears
 
+//Hostile Mob AI Status
+#define AI_ON		1
+#define AI_SLEEP	2
+#define AI_OFF		3
+
 
 //Embedded objects
 #define EMBEDDED_PAIN_CHANCE 		15	//Chance for embedded objects to cause pain (damage user)
diff --git a/code/modules/mob/living/simple_animal/hostile/hostile.dm b/code/modules/mob/living/simple_animal/hostile/hostile.dm
index 3828dbdce6c..7d1b74fe07a 100644
--- a/code/modules/mob/living/simple_animal/hostile/hostile.dm
+++ b/code/modules/mob/living/simple_animal/hostile/hostile.dm
@@ -30,6 +30,8 @@
 	var/stat_exclusive = 0 //Mobs with this set to 1 will exclusively attack things defined by stat_attack, stat_attack 2 means they will only attack corpses
 	var/attack_same = 0 //Set us to 1 to allow us to attack our own faction, or 2, to only ever attack our own faction
 
+	var/AIStatus = AI_ON //The Status of our AI, can be set to AI_ON (On, usual processing), AI_SLEEP (Will not process, but will return to AI_ON if an enemy comes near), AI_OFF (Off, Not processing ever)
+
 /mob/living/simple_animal/hostile/Life()
 
 	. = ..()
@@ -40,6 +42,8 @@
 		ranged_cooldown--
 	if(client)
 		return 0
+	if(!AICanContinue())
+		return 0
 	if(!stat)
 		switch(stance)
 			if(HOSTILE_STANCE_IDLE)
@@ -56,6 +60,9 @@
 				AttackTarget()
 				DestroySurroundings()
 
+		if(AIShouldSleep())
+			AIStatus = AI_SLEEP
+
 
 //////////////HOSTILE MOB TARGETTING AND AGGRESSION////////////
 
@@ -313,4 +320,33 @@
 	if(ranged && ranged_cooldown <= 0)
 		target = A
 		OpenFire(A)
-	..()
\ No newline at end of file
+	..()
+
+
+
+////// AI Status ///////
+/mob/living/simple_animal/hostile/proc/AICanContinue()
+	switch(AIStatus)
+		if(AI_ON)
+			. = 1
+		if(AI_SLEEP)
+			if(AIShouldWake())
+				. = 1
+				AIStatus = AI_ON //Wake up for more than one Life() cycle.
+			else
+				. = 0
+		if(AI_OFF)
+			. = 0
+
+
+//Returns 1 if the AI should wake up
+//Returns 0 if the AI should remain asleep
+/mob/living/simple_animal/hostile/proc/AIShouldWake()
+	. = 0
+	if(FindTarget())
+		. = 1
+
+
+//Convenience
+/mob/living/simple_animal/hostile/proc/AIShouldSleep()
+	. = !(AIShouldWake())
\ No newline at end of file