From 8573b651c8bb00612b161cc44664cbbb6dd16327 Mon Sep 17 00:00:00 2001
From: xinef1 <w.szyszko2@gmail.com>
Date: Sat, 21 Jan 2017 14:46:32 +0100
Subject: Core/Units: Drop hostile world references that are out of our sight
 (fixes combat bug) (#18591)

(cherry-picked from ba6281bf429384a506aad5125bcc537eef5bfe77)
---
 src/server/game/AI/CoreAI/PetAI.cpp          |  5 +++++
 src/server/game/Combat/HostileRefManager.cpp | 20 ++++++++++++++++++++
 src/server/game/Combat/HostileRefManager.h   |  3 +++
 src/server/game/Entities/Player/Player.cpp   | 13 +++++++++++++
 src/server/game/Entities/Player/Player.h     |  1 +
 5 files changed, 42 insertions(+)

(limited to 'src')

diff --git a/src/server/game/AI/CoreAI/PetAI.cpp b/src/server/game/AI/CoreAI/PetAI.cpp
index f30b2369e91..cab622be0cb 100644
--- a/src/server/game/AI/CoreAI/PetAI.cpp
+++ b/src/server/game/AI/CoreAI/PetAI.cpp
@@ -50,6 +50,11 @@ bool PetAI::_needToStop()
     if (me->IsCharmed() && me->GetVictim() == me->GetCharmer())
         return true;
 
+    // dont allow pets to follow targets far away from owner
+    if (Unit* owner = me->GetCharmerOrOwner())
+        if (owner->GetExactDist(me) >= (owner->GetVisibilityRange()-10.0f))
+            return true;
+
     return !me->IsValidAttackTarget(me->GetVictim());
 }
 
diff --git a/src/server/game/Combat/HostileRefManager.cpp b/src/server/game/Combat/HostileRefManager.cpp
index 98883f3ac70..bcea34d7e83 100644
--- a/src/server/game/Combat/HostileRefManager.cpp
+++ b/src/server/game/Combat/HostileRefManager.cpp
@@ -141,6 +141,26 @@ void HostileRefManager::deleteReferencesForFaction(uint32 faction)
     }
 }
 
+//=================================================
+// delete all references out of specified range
+
+void HostileRefManager::deleteReferencesOutOfRange(float range)
+{
+    HostileReference* ref = getFirst();
+    range = range*range;
+    while (ref)
+    {
+        HostileReference* nextRef = ref->next();
+        Unit* owner = ref->GetSource()->GetOwner();
+        if (!owner->isActiveObject() && owner->GetExactDist2dSq(GetOwner()) > range)
+        {
+            ref->removeReference();
+            delete ref;
+        }
+        ref = nextRef;
+    }
+}
+
 //=================================================
 // delete one reference, defined by Unit
 
diff --git a/src/server/game/Combat/HostileRefManager.h b/src/server/game/Combat/HostileRefManager.h
index fc26d950e67..585d96b7443 100644
--- a/src/server/game/Combat/HostileRefManager.h
+++ b/src/server/game/Combat/HostileRefManager.h
@@ -53,6 +53,9 @@ class TC_GAME_API HostileRefManager : public RefManager<Unit, ThreatManager>
         // Remove specific faction references
         void deleteReferencesForFaction(uint32 faction);
 
+        // for combat bugs
+        void deleteReferencesOutOfRange(float range);
+
         HostileReference* getFirst() { return ((HostileReference*) RefManager<Unit, ThreatManager>::getFirst()); }
 
         void updateThreatTables();
diff --git a/src/server/game/Entities/Player/Player.cpp b/src/server/game/Entities/Player/Player.cpp
index 01d6b9e2066..6131c40aca0 100644
--- a/src/server/game/Entities/Player/Player.cpp
+++ b/src/server/game/Entities/Player/Player.cpp
@@ -210,6 +210,7 @@ Player::Player(WorldSession* session) : Unit(true), m_sceneMgr(this)
     m_MirrorTimerFlags = UNDERWATER_NONE;
     m_MirrorTimerFlagsLast = UNDERWATER_NONE;
     m_isInWater = false;
+    m_hostileReferenceCheckTimer = 0;
     m_drunkTimer = 0;
     m_deathTimer = 0;
     m_deathExpireTime = 0;
@@ -1348,6 +1349,18 @@ void Player::Update(uint32 p_time)
     //if (pet && !pet->IsWithinDistInMap(this, GetMap()->GetVisibilityDistance()) && (GetCharmGUID() && (pet->GetGUID() != GetCharmGUID())))
         RemovePet(pet, PET_SAVE_NOT_IN_SLOT, true);
 
+    if (IsAlive())
+    {
+        if (m_hostileReferenceCheckTimer <= p_time)
+        {
+            m_hostileReferenceCheckTimer = 15 * IN_MILLISECONDS;
+            if (!GetMap()->IsDungeon())
+                getHostileRefManager().deleteReferencesOutOfRange(GetVisibilityRange());
+        }
+        else
+            m_hostileReferenceCheckTimer -= p_time;
+    }
+
     //we should execute delayed teleports only for alive(!) players
     //because we don't want player's ghost teleported from graveyard
     if (IsHasDelayedTeleport() && IsAlive())
diff --git a/src/server/game/Entities/Player/Player.h b/src/server/game/Entities/Player/Player.h
index fd2b6e9a049..eb12abc021c 100644
--- a/src/server/game/Entities/Player/Player.h
+++ b/src/server/game/Entities/Player/Player.h
@@ -2593,6 +2593,7 @@ class TC_GAME_API Player : public Unit, public GridObject<Player>
         bool   m_SeasonalQuestChanged;
         time_t m_lastDailyQuestTime;
 
+        uint32 m_hostileReferenceCheckTimer;
         uint32 m_drunkTimer;
         uint32 m_weaponChangeTimer;
 
-- 
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