feat(Core/Optimization): Optimize build of units update object by leveraging cache (#18637)

* feat(Core/Optimization): Optimize build of units update object by leveraging cache.

* Remove whitespaces.

* Add alternative hooks to handle transmog and other similar things.

* Fix build on some compilers.

* Fix codestyle

* Fix build again.

* Take into account updateType.

src/server/game/Entities/Corpse/Corpse.cpp

@@ -198,7 +198,7 @@ void Corpse::ResetGhostTime()
     m_time = GameTime::GetGameTime().count();
 }
 
-void Corpse::BuildValuesUpdate(uint8 updateType, ByteBuffer* data, Player* target) const
+void Corpse::BuildValuesUpdate(uint8 updateType, ByteBuffer* data, Player* target)
 {
     if (!target)
         return;

src/server/game/Entities/Corpse/Corpse.h

@@ -54,7 +54,7 @@ public:
     void AddToWorld() override;
     void RemoveFromWorld() override;
 
-    void BuildValuesUpdate(uint8 updateType, ByteBuffer* data, Player* target) const override;
+    void BuildValuesUpdate(uint8 updateType, ByteBuffer* data, Player* target) override;
 
     bool Create(ObjectGuid::LowType guidlow);
     bool Create(ObjectGuid::LowType guidlow, Player* owner);

src/server/game/Entities/GameObject/GameObject.cpp

@@ -2738,7 +2738,7 @@ GameObject* GameObject::GetLinkedTrap()
     return ObjectAccessor::GetGameObject(*this, m_linkedTrap);
 }
 
-void GameObject::BuildValuesUpdate(uint8 updateType, ByteBuffer* data, Player* target) const
+void GameObject::BuildValuesUpdate(uint8 updateType, ByteBuffer* data, Player* target)
 {
     if (!target)
         return;

src/server/game/Entities/GameObject/GameObject.h

@@ -124,7 +124,7 @@ public:
     explicit GameObject();
     ~GameObject() override;
 
-    void BuildValuesUpdate(uint8 updatetype, ByteBuffer* data, Player* target) const override;
+    void BuildValuesUpdate(uint8 updateType, ByteBuffer* data, Player* target) override;
 
     void AddToWorld() override;
     void RemoveFromWorld() override;

src/server/game/Entities/Item/Container/Bag.cpp

@@ -166,7 +166,7 @@ void Bag::StoreItem(uint8 slot, Item* pItem, bool /*update*/)
     }
 }
 
-void Bag::BuildCreateUpdateBlockForPlayer(UpdateData* data, Player* target) const
+void Bag::BuildCreateUpdateBlockForPlayer(UpdateData* data, Player* target)
 {
     Item::BuildCreateUpdateBlockForPlayer(data, target);
 

src/server/game/Entities/Item/Container/Bag.h

@@ -55,7 +55,7 @@ public:
     // overwrite virtual Item::DeleteFromDB
     void DeleteFromDB(CharacterDatabaseTransaction trans) override;
 
-    void BuildCreateUpdateBlockForPlayer(UpdateData* data, Player* target) const override;
+    void BuildCreateUpdateBlockForPlayer(UpdateData* data, Player* target) override;
 
     std::string GetDebugInfo() const override;
 

src/server/game/Entities/Object/Object.cpp

@@ -186,7 +186,7 @@ void Object::BuildMovementUpdateBlock(UpdateData* data, uint32 flags) const
     data->AddUpdateBlock(buf);
 }
 
-void Object::BuildCreateUpdateBlockForPlayer(UpdateData* data, Player* target) const
+void Object::BuildCreateUpdateBlockForPlayer(UpdateData* data, Player* target)
 {
     if (!target)
         return;
@@ -254,7 +254,7 @@ void Object::SendUpdateToPlayer(Player* player)
     player->GetSession()->SendPacket(&packet);
 }
 
-void Object::BuildValuesUpdateBlockForPlayer(UpdateData* data, Player* target) const
+void Object::BuildValuesUpdateBlockForPlayer(UpdateData* data, Player* target)
 {
     ByteBuffer buf(500);
 
@@ -494,7 +494,7 @@ void Object::BuildMovementUpdate(ByteBuffer* data, uint16 flags) const
     }
 }
 
-void Object::BuildValuesUpdate(uint8 updateType, ByteBuffer* data, Player* target) const
+void Object::BuildValuesUpdate(uint8 updateType, ByteBuffer* data, Player* target)
 {
     if (!target)
         return;
@@ -542,7 +542,7 @@ void Object::ClearUpdateMask(bool remove)
     }
 }
 
-void Object::BuildFieldsUpdate(Player* player, UpdateDataMapType& data_map) const
+void Object::BuildFieldsUpdate(Player* player, UpdateDataMapType& data_map)
 {
     UpdateDataMapType::iterator iter = data_map.find(player);
 

src/server/game/Entities/Object/Object.h

@@ -121,10 +121,10 @@ public:
     [[nodiscard]] TypeID GetTypeId() const { return m_objectTypeId; }
     [[nodiscard]] bool isType(uint16 mask) const { return (mask & m_objectType); }
 
-    virtual void BuildCreateUpdateBlockForPlayer(UpdateData* data, Player* target) const;
+    virtual void BuildCreateUpdateBlockForPlayer(UpdateData* data, Player* target);
     void SendUpdateToPlayer(Player* player);
 
-    void BuildValuesUpdateBlockForPlayer(UpdateData* data, Player* target) const;
+    void BuildValuesUpdateBlockForPlayer(UpdateData* data, Player* target);
     void BuildOutOfRangeUpdateBlock(UpdateData* data) const;
     void BuildMovementUpdateBlock(UpdateData* data, uint32 flags = 0) const;
 
@@ -183,7 +183,7 @@ public:
     [[nodiscard]] virtual bool hasQuest(uint32 /* quest_id */) const { return false; }
     [[nodiscard]] virtual bool hasInvolvedQuest(uint32 /* quest_id */) const { return false; }
     virtual void BuildUpdate(UpdateDataMapType&, UpdatePlayerSet&) {}
-    void BuildFieldsUpdate(Player*, UpdateDataMapType&) const;
+    void BuildFieldsUpdate(Player*, UpdateDataMapType&);
 
     void SetFieldNotifyFlag(uint16 flag) { _fieldNotifyFlags |= flag; }
     void RemoveFieldNotifyFlag(uint16 flag) { _fieldNotifyFlags &= ~flag; }
@@ -223,7 +223,7 @@ protected:
     uint32 GetUpdateFieldData(Player const* target, uint32*& flags) const;
 
     void BuildMovementUpdate(ByteBuffer* data, uint16 flags) const;
-    virtual void BuildValuesUpdate(uint8 updatetype, ByteBuffer* data, Player* target) const;
+    virtual void BuildValuesUpdate(uint8 updateType, ByteBuffer* data, Player* target);
 
     uint16 m_objectType;
 

src/server/game/Entities/Player/Player.cpp

@@ -3791,7 +3791,7 @@ Mail* Player::GetMail(uint32 id)
     return nullptr;
 }
 
-void Player::BuildCreateUpdateBlockForPlayer(UpdateData* data, Player* target) const
+void Player::BuildCreateUpdateBlockForPlayer(UpdateData* data, Player* target)
 {
     if (target == this)
     {

src/server/game/Entities/Player/Player.h

@@ -1974,7 +1974,7 @@ public:
     [[nodiscard]] WorldSession* GetSession() const { return m_session; }
     void SetSession(WorldSession* sess) { m_session = sess; }
 
-    void BuildCreateUpdateBlockForPlayer(UpdateData* data, Player* target) const override;
+    void BuildCreateUpdateBlockForPlayer(UpdateData* data, Player* target) override;
     void DestroyForPlayer(Player* target, bool onDeath = false) const override;
     void SendLogXPGain(uint32 GivenXP, Unit* victim, uint32 BonusXP, bool recruitAFriend = false, float group_rate = 1.0f);
 

src/server/game/Entities/Unit/Unit.cpp

@@ -534,6 +534,8 @@ void Unit::Update(uint32 p_time)
 
     UpdateSplineMovement(p_time);
     GetMotionMaster()->UpdateMotion(p_time);
+
+    InvalidateValuesUpdateCache();
 }
 
 bool Unit::haveOffhandWeapon() const
@@ -21034,16 +21036,11 @@ void Unit::SendMovementHover(Player* sendTo)
     sendTo->SendDirectMessage(&data);
 }
 
-void Unit::BuildValuesUpdate(uint8 updateType, ByteBuffer* data, Player* target) const
+void Unit::BuildValuesUpdate(uint8 updateType, ByteBuffer* data, Player* target)
 {
     if (!target)
         return;
 
-    ByteBuffer fieldBuffer;
-
-    UpdateMask updateMask;
-    updateMask.SetCount(m_valuesCount);
-
     uint32* flags = UnitUpdateFieldFlags;
     uint32 visibleFlag = UF_FLAG_PUBLIC;
 
@@ -21061,7 +21058,30 @@ void Unit::BuildValuesUpdate(uint8 updateType, ByteBuffer* data, Player* target)
     if (plr && plr->IsInSameRaidWith(target))
         visibleFlag |= UF_FLAG_PARTY_MEMBER;
 
-    Creature const* creature = ToCreature();
+    uint64 cacheKey = static_cast<uint64>(visibleFlag) << 8 | updateType;
+
+    auto cacheIt = _valuesUpdateCache.find(cacheKey);
+    if (cacheIt != _valuesUpdateCache.end())
+    {
+        int32 cachePos = static_cast<int32>(data->wpos());
+        data->append(cacheIt->second.buffer);
+
+        BuildValuesCachePosPointers dataAdjustedPos = cacheIt->second.posPointers;
+        if (cachePos)
+            dataAdjustedPos.ApplyOffset(cachePos);
+
+        PatchValuesUpdate(*data, dataAdjustedPos, target);
+
+        return;
+    }
+
+    BuildValuesCachedBuffer cacheValue(500);
+
+    ByteBuffer fieldBuffer(400);
+
+    UpdateMask updateMask;
+    updateMask.SetCount(m_valuesCount);
+
     for (uint16 index = 0; index < m_valuesCount; ++index)
     {
         if (_fieldNotifyFlags & flags[index] ||
@@ -21073,37 +21093,13 @@ void Unit::BuildValuesUpdate(uint8 updateType, ByteBuffer* data, Player* target)
 
             if (index == UNIT_NPC_FLAGS)
             {
-                uint32 appendValue = m_uint32Values[UNIT_NPC_FLAGS];
-
-                if (creature)
-                {
-                    if (sWorld->getIntConfig(CONFIG_INSTANT_TAXI) == 2 && appendValue & UNIT_NPC_FLAG_FLIGHTMASTER)
-                    {
-                        appendValue |= UNIT_NPC_FLAG_GOSSIP; // flight masters need NPC gossip flag to show instant flight toggle option
-                    }
-
-                    if (!target->CanSeeSpellClickOn(creature))
-                    {
-                        appendValue &= ~UNIT_NPC_FLAG_SPELLCLICK;
-                    }
-
-                    if (!target->CanSeeVendor(creature))
-                    {
-                        appendValue &= ~UNIT_NPC_FLAG_VENDOR_MASK;
-                    }
-
-                    if (!creature->IsValidTrainerForPlayer(target, &appendValue))
-                    {
-                        appendValue &= ~UNIT_NPC_FLAG_TRAINER;
-                    }
-                }
-
-                fieldBuffer << uint32(appendValue);
+                cacheValue.posPointers.UnitNPCFlagsPos = int32(fieldBuffer.wpos());
+                fieldBuffer << m_uint32Values[UNIT_NPC_FLAGS];
             }
             else if (index == UNIT_FIELD_AURASTATE)
             {
-                // Check per caster aura states to not enable using a spell in client if specified aura is not by target
-                fieldBuffer << BuildAuraStateUpdateForTarget(target);
+                cacheValue.posPointers.UnitFieldAuraStatePos = int32(fieldBuffer.wpos());
+                fieldBuffer << uint32(0); // Fill in later.
             }
             // FIXME: Some values at server stored in float format but must be sent to client in uint32 format
             else if (index >= UNIT_FIELD_BASEATTACKTIME && index <= UNIT_FIELD_RANGEDATTACKTIME)
@@ -21122,115 +21118,35 @@ void Unit::BuildValuesUpdate(uint8 updateType, ByteBuffer* data, Player* target)
             // Gamemasters should be always able to select units - remove not selectable flag
             else if (index == UNIT_FIELD_FLAGS)
             {
-                uint32 appendValue = m_uint32Values[UNIT_FIELD_FLAGS];
-                if (target->IsGameMaster() && target->GetSession()->IsGMAccount())
-                    appendValue &= ~UNIT_FLAG_NOT_SELECTABLE;
-
-                fieldBuffer << uint32(appendValue);
+                cacheValue.posPointers.UnitFieldFlagsPos = int32(fieldBuffer.wpos());
+                fieldBuffer << m_uint32Values[UNIT_FIELD_FLAGS];
             }
             // use modelid_a if not gm, _h if gm for CREATURE_FLAG_EXTRA_TRIGGER creatures
             else if (index == UNIT_FIELD_DISPLAYID)
             {
-                uint32 displayId = m_uint32Values[UNIT_FIELD_DISPLAYID];
-                if (creature)
-                {
-                    CreatureTemplate const* cinfo = creature->GetCreatureTemplate();
-
-                    // this also applies for transform auras
-                    if (SpellInfo const* transform = sSpellMgr->GetSpellInfo(getTransForm()))
-                        for (uint8 i = 0; i < MAX_SPELL_EFFECTS; ++i)
-                            if (transform->Effects[i].IsAura(SPELL_AURA_TRANSFORM))
-                                if (CreatureTemplate const* transformInfo = sObjectMgr->GetCreatureTemplate(transform->Effects[i].MiscValue))
-                                {
-                                    cinfo = transformInfo;
-                                    break;
-                                }
-
-                    if (cinfo->flags_extra & CREATURE_FLAG_EXTRA_TRIGGER)
-                    {
-                        if (target->IsGameMaster() && target->GetSession()->IsGMAccount())
-                        {
-                            if (cinfo->Modelid1)
-                                displayId = cinfo->Modelid1;    // Modelid1 is a visible model for gms
-                            else
-                                displayId = 17519;              // world visible trigger's model
-                        }
-                        else
-                        {
-                            if (cinfo->Modelid2)
-                                displayId = cinfo->Modelid2;    // Modelid2 is an invisible model for players
-                            else
-                                displayId = 11686;              // world invisible trigger's model
-                        }
-                    }
-                }
-
-                fieldBuffer << uint32(displayId);
+                cacheValue.posPointers.UnitFieldDisplayPos = int32(fieldBuffer.wpos());
+                fieldBuffer << m_uint32Values[UNIT_FIELD_DISPLAYID];
             }
-            // hide lootable animation for unallowed players
             else if (index == UNIT_DYNAMIC_FLAGS)
             {
+                cacheValue.posPointers.UnitDynamicFlagsPos = int32(fieldBuffer.wpos());
                 uint32 dynamicFlags = m_uint32Values[UNIT_DYNAMIC_FLAGS] & ~(UNIT_DYNFLAG_TAPPED | UNIT_DYNFLAG_TAPPED_BY_PLAYER);
-
-                if (creature)
-                {
-                    if (creature->hasLootRecipient())
-                    {
-                        dynamicFlags |= UNIT_DYNFLAG_TAPPED;
-                        if (creature->isTappedBy(target))
-                            dynamicFlags |= UNIT_DYNFLAG_TAPPED_BY_PLAYER;
-                    }
-
-                    if (!target->isAllowedToLoot(creature))
-                        dynamicFlags &= ~UNIT_DYNFLAG_LOOTABLE;
-                }
-
-                // unit UNIT_DYNFLAG_TRACK_UNIT should only be sent to caster of SPELL_AURA_MOD_STALKED auras
-                if (dynamicFlags & UNIT_DYNFLAG_TRACK_UNIT)
-                    if (!HasAuraTypeWithCaster(SPELL_AURA_MOD_STALKED, target->GetGUID()))
-                        dynamicFlags &= ~UNIT_DYNFLAG_TRACK_UNIT;
-
                 fieldBuffer << dynamicFlags;
             }
-            // FG: pretend that OTHER players in own group are friendly ("blue")
-            else if (index == UNIT_FIELD_BYTES_2 || index == UNIT_FIELD_FACTIONTEMPLATE)
+            else if (index == UNIT_FIELD_BYTES_2)
             {
-                if (IsControlledByPlayer() && target != this && sWorld->getBoolConfig(CONFIG_ALLOW_TWO_SIDE_INTERACTION_GROUP) && IsInRaidWith(target))
-                {
-                    FactionTemplateEntry const* ft1 = GetFactionTemplateEntry();
-                    FactionTemplateEntry const* ft2 = target->GetFactionTemplateEntry();
-                    if (ft1 && ft2 && !ft1->IsFriendlyTo(*ft2))
-                    {
-                        if (index == UNIT_FIELD_BYTES_2)
-                            // Allow targetting opposite faction in party when enabled in config
-                            fieldBuffer << (m_uint32Values[UNIT_FIELD_BYTES_2] & ((UNIT_BYTE2_FLAG_SANCTUARY /*| UNIT_BYTE2_FLAG_AURAS | UNIT_BYTE2_FLAG_UNK5*/) << 8)); // this flag is at uint8 offset 1 !!
-                        else
-                            // pretend that all other HOSTILE players have own faction, to allow follow, heal, rezz (trade wont work)
-                            fieldBuffer << uint32(target->GetFaction());
-                    }
-                    else
-                        fieldBuffer << m_uint32Values[index];
-                }// pussywizard / Callmephil
-                else if (target->IsSpectator() && target->FindMap() && target->FindMap()->IsBattleArena() &&
-                         (this->GetTypeId() == TYPEID_PLAYER || this->GetTypeId() == TYPEID_UNIT || this->GetTypeId() == TYPEID_DYNAMICOBJECT))
-                {
-                    if (index == UNIT_FIELD_BYTES_2)
-                        fieldBuffer << (m_uint32Values[index] & 0xFFFFF2FF); // clear UNIT_BYTE2_FLAG_PVP, UNIT_BYTE2_FLAG_FFA_PVP, UNIT_BYTE2_FLAG_SANCTUARY
-                    else
-                        fieldBuffer << (uint32)target->GetFaction();
-                }
-                else
-                    if (!sScriptMgr->IsCustomBuildValuesUpdate(this, updateType, fieldBuffer, target, index))
-                    {
-                        fieldBuffer << m_uint32Values[index];
-                    }
+                cacheValue.posPointers.UnitFieldBytes2Pos = int32(fieldBuffer.wpos());
+                fieldBuffer << m_uint32Values[index];
+            }
+            else if (index == UNIT_FIELD_FACTIONTEMPLATE)
+            {
+                cacheValue.posPointers.UnitFieldFactionTemplatePos = int32(fieldBuffer.wpos());
+                fieldBuffer << m_uint32Values[index];
             }
             else
             {
-                if (sScriptMgr->OnBuildValuesUpdate(this, updateType, fieldBuffer, target, index))
-                {
-                    continue;
-                }
+                if (sScriptMgr->ShouldTrackValuesUpdatePosByIndex(this, updateType, index))
+                    cacheValue.posPointers.other[index] = static_cast<uint32>(fieldBuffer.wpos());
 
                 // send in current format (float as float, uint32 as uint32)
                 fieldBuffer << m_uint32Values[index];
@@ -21238,9 +21154,167 @@ void Unit::BuildValuesUpdate(uint8 updateType, ByteBuffer* data, Player* target)
         }
     }
 
-    *data << uint8(updateMask.GetBlockCount());
-    updateMask.AppendToPacket(data);
-    data->append(fieldBuffer);
+    cacheValue.buffer << uint8(updateMask.GetBlockCount());
+    updateMask.AppendToPacket(&cacheValue.buffer);
+    int32 fieldBufferPos = static_cast<int32>(cacheValue.buffer.wpos());
+    cacheValue.buffer.append(fieldBuffer);
+    cacheValue.posPointers.ApplyOffset(fieldBufferPos);
+
+    int32 cachePos = static_cast<int32>(data->wpos());
+    data->append(cacheValue.buffer);
+
+    BuildValuesCachePosPointers dataAdjustedPos = cacheValue.posPointers;
+    if (cachePos)
+        dataAdjustedPos.ApplyOffset(cachePos);
+
+    PatchValuesUpdate(*data, dataAdjustedPos, target);
+
+    _valuesUpdateCache.insert(std::pair<uint64, BuildValuesCachedBuffer>(cacheKey, std::move(cacheValue)));
+}
+
+void Unit::PatchValuesUpdate(ByteBuffer& valuesUpdateBuf, BuildValuesCachePosPointers& posPointers, Player* target)
+{
+    Creature const* creature = ToCreature();
+
+    // UNIT_NPC_FLAGS
+    if (creature && posPointers.UnitNPCFlagsPos >= 0)
+    {
+        uint32 appendValue = m_uint32Values[UNIT_NPC_FLAGS];
+
+        if (sWorld->getIntConfig(CONFIG_INSTANT_TAXI) == 2 && appendValue & UNIT_NPC_FLAG_FLIGHTMASTER)
+            appendValue |= UNIT_NPC_FLAG_GOSSIP; // flight masters need NPC gossip flag to show instant flight toggle option
+
+        if (!target->CanSeeSpellClickOn(creature))
+            appendValue &= ~UNIT_NPC_FLAG_SPELLCLICK;
+
+        if (!target->CanSeeVendor(creature))
+            appendValue &= ~UNIT_NPC_FLAG_VENDOR_MASK;
+
+        if (!creature->IsValidTrainerForPlayer(target, &appendValue))
+            appendValue &= ~UNIT_NPC_FLAG_TRAINER;
+
+        valuesUpdateBuf.put(posPointers.UnitNPCFlagsPos, appendValue);
+    }
+
+    // UNIT_FIELD_AURASTATE
+    if (posPointers.UnitFieldAuraStatePos >= 0)
+        valuesUpdateBuf.put(posPointers.UnitFieldAuraStatePos, uint32(BuildAuraStateUpdateForTarget(target)));
+
+    // UNIT_FIELD_FLAGS
+    if (posPointers.UnitFieldFlagsPos >= 0)
+    {
+        uint32 appendValue = m_uint32Values[UNIT_FIELD_FLAGS];
+        if (target->IsGameMaster() && target->GetSession()->IsGMAccount())
+            appendValue &= ~UNIT_FLAG_NOT_SELECTABLE;
+
+        valuesUpdateBuf.put(posPointers.UnitFieldFlagsPos, appendValue);
+    }
+
+    // UNIT_FIELD_DISPLAYID
+    // Use modelid_a if not gm, _h if gm for CREATURE_FLAG_EXTRA_TRIGGER creatures.
+    if (posPointers.UnitFieldDisplayPos >= 0)
+    {
+        uint32 displayId = m_uint32Values[UNIT_FIELD_DISPLAYID];
+        if (creature)
+        {
+            CreatureTemplate const* cinfo = creature->GetCreatureTemplate();
+
+            // this also applies for transform auras
+            if (SpellInfo const* transform = sSpellMgr->GetSpellInfo(getTransForm()))
+                for (uint8 i = 0; i < MAX_SPELL_EFFECTS; ++i)
+                    if (transform->Effects[i].IsAura(SPELL_AURA_TRANSFORM))
+                        if (CreatureTemplate const* transformInfo = sObjectMgr->GetCreatureTemplate(transform->Effects[i].MiscValue))
+                        {
+                            cinfo = transformInfo;
+                            break;
+                        }
+
+            if (cinfo->flags_extra & CREATURE_FLAG_EXTRA_TRIGGER)
+            {
+                if (target->IsGameMaster() && target->GetSession()->IsGMAccount())
+                {
+                    if (cinfo->Modelid1)
+                        displayId = cinfo->Modelid1;    // Modelid1 is a visible model for gms
+                    else
+                        displayId = 17519;              // world visible trigger's model
+                }
+                else
+                {
+                    if (cinfo->Modelid2)
+                        displayId = cinfo->Modelid2;    // Modelid2 is an invisible model for players
+                    else
+                        displayId = 11686;              // world invisible trigger's model
+                }
+            }
+        }
+
+        valuesUpdateBuf.put(posPointers.UnitFieldDisplayPos, uint32(displayId));
+    }
+
+    // UNIT_DYNAMIC_FLAGS
+    // Hide lootable animation for unallowed players.
+    if (posPointers.UnitDynamicFlagsPos >= 0)
+    {
+        uint32 dynamicFlags = m_uint32Values[UNIT_DYNAMIC_FLAGS] & ~(UNIT_DYNFLAG_TAPPED | UNIT_DYNFLAG_TAPPED_BY_PLAYER);
+
+        if (creature)
+        {
+            if (creature->hasLootRecipient())
+            {
+                dynamicFlags |= UNIT_DYNFLAG_TAPPED;
+                if (creature->isTappedBy(target))
+                    dynamicFlags |= UNIT_DYNFLAG_TAPPED_BY_PLAYER;
+            }
+
+            if (!target->isAllowedToLoot(creature))
+                dynamicFlags &= ~UNIT_DYNFLAG_LOOTABLE;
+        }
+
+        // unit UNIT_DYNFLAG_TRACK_UNIT should only be sent to caster of SPELL_AURA_MOD_STALKED auras
+        if (dynamicFlags & UNIT_DYNFLAG_TRACK_UNIT)
+            if (!HasAuraTypeWithCaster(SPELL_AURA_MOD_STALKED, target->GetGUID()))
+                dynamicFlags &= ~UNIT_DYNFLAG_TRACK_UNIT;
+
+        valuesUpdateBuf.put(posPointers.UnitDynamicFlagsPos, dynamicFlags);
+    }
+
+    // UNIT_FIELD_BYTES_2
+    if (posPointers.UnitFieldBytes2Pos >= 0)
+    {
+        if (IsControlledByPlayer() && target != this && sWorld->getBoolConfig(CONFIG_ALLOW_TWO_SIDE_INTERACTION_GROUP) && IsInRaidWith(target))
+        {
+            FactionTemplateEntry const* ft1 = GetFactionTemplateEntry();
+            FactionTemplateEntry const* ft2 = target->GetFactionTemplateEntry();
+            if (ft1 && ft2 && !ft1->IsFriendlyTo(*ft2))
+                // Allow targetting opposite faction in party when enabled in config
+                valuesUpdateBuf.put(posPointers.UnitFieldBytes2Pos, (m_uint32Values[UNIT_FIELD_BYTES_2] & ((UNIT_BYTE2_FLAG_SANCTUARY /*| UNIT_BYTE2_FLAG_AURAS | UNIT_BYTE2_FLAG_UNK5*/) << 8))); // this flag is at uint8 offset 1 !!
+        }// pussywizard / Callmephil
+        else if (target->IsSpectator() && target->FindMap() && target->FindMap()->IsBattleArena() &&
+                    (this->GetTypeId() == TYPEID_PLAYER || this->GetTypeId() == TYPEID_UNIT || this->GetTypeId() == TYPEID_DYNAMICOBJECT))
+        {
+                valuesUpdateBuf.put(posPointers.UnitFieldBytes2Pos, (m_uint32Values[UNIT_FIELD_BYTES_2] & 0xFFFFF2FF)); // clear UNIT_BYTE2_FLAG_PVP, UNIT_BYTE2_FLAG_FFA_PVP, UNIT_BYTE2_FLAG_SANCTUARY
+        }
+    }
+
+    // UNIT_FIELD_FACTIONTEMPLATE
+    if (posPointers.UnitFieldFactionTemplatePos >= 0)
+    {
+        if (IsControlledByPlayer() && target != this && sWorld->getBoolConfig(CONFIG_ALLOW_TWO_SIDE_INTERACTION_GROUP) && IsInRaidWith(target))
+        {
+            FactionTemplateEntry const* ft1 = GetFactionTemplateEntry();
+            FactionTemplateEntry const* ft2 = target->GetFactionTemplateEntry();
+            if (ft1 && ft2 && !ft1->IsFriendlyTo(*ft2))
+                // pretend that all other HOSTILE players have own faction, to allow follow, heal, rezz (trade wont work)
+                valuesUpdateBuf.put(posPointers.UnitFieldFactionTemplatePos, uint32(target->GetFaction()));
+        }// pussywizard / Callmephil
+        else if (target->IsSpectator() && target->FindMap() && target->FindMap()->IsBattleArena() &&
+                    (this->GetTypeId() == TYPEID_PLAYER || this->GetTypeId() == TYPEID_UNIT || this->GetTypeId() == TYPEID_DYNAMICOBJECT))
+        {
+            valuesUpdateBuf.put(posPointers.UnitFieldFactionTemplatePos, uint32(target->GetFaction()));
+        }
+    }
+
+    sScriptMgr->OnPatchValuesUpdate(this, valuesUpdateBuf, posPointers, target);
 }
 
 void Unit::BuildCooldownPacket(WorldPacket& data, uint8 flags, uint32 spellId, uint32 cooldown)

src/server/game/Entities/Unit/Unit.h

@@ -1321,6 +1321,62 @@ private:
     Unit* defaultValue;
 };
 
+// BuildValuesCachePosPointers is marks of the position of some data inside of BuildValue cache.
+struct BuildValuesCachePosPointers
+{
+    BuildValuesCachePosPointers() :
+        UnitNPCFlagsPos(-1), UnitFieldAuraStatePos(-1), UnitFieldFlagsPos(-1), UnitFieldDisplayPos(-1),
+        UnitDynamicFlagsPos(-1), UnitFieldBytes2Pos(-1), UnitFieldFactionTemplatePos(-1) {}
+
+    void ApplyOffset(uint32 offset)
+    {
+        if (UnitNPCFlagsPos >= 0)
+            UnitNPCFlagsPos += offset;
+
+        if (UnitFieldAuraStatePos >= 0)
+            UnitFieldAuraStatePos += offset;
+
+        if (UnitFieldFlagsPos >= 0)
+            UnitFieldFlagsPos += offset;
+
+        if (UnitFieldDisplayPos >= 0)
+            UnitFieldDisplayPos += offset;
+
+        if (UnitDynamicFlagsPos >= 0)
+            UnitDynamicFlagsPos += offset;
+
+        if (UnitFieldBytes2Pos >= 0)
+            UnitFieldBytes2Pos += offset;
+
+        if (UnitFieldFactionTemplatePos >= 0)
+            UnitFieldFactionTemplatePos += offset;
+
+        for (auto it = other.begin(); it != other.end(); ++it)
+            it->second += offset;
+    }
+
+    int32 UnitNPCFlagsPos;
+    int32 UnitFieldAuraStatePos;
+    int32 UnitFieldFlagsPos;
+    int32 UnitFieldDisplayPos;
+    int32 UnitDynamicFlagsPos;
+    int32 UnitFieldBytes2Pos;
+    int32 UnitFieldFactionTemplatePos;
+
+    std::unordered_map<uint16 /*index*/, uint32 /*pos*/> other;
+};
+
+// BuildValuesCachedBuffer cache for calculated BuildValue.
+struct BuildValuesCachedBuffer
+{
+    BuildValuesCachedBuffer(uint32 bufferSize) :
+        buffer(bufferSize), posPointers() {}
+
+    ByteBuffer buffer;
+
+    BuildValuesCachePosPointers posPointers;
+};
+
 class Unit : public WorldObject
 {
 public:
@@ -2505,7 +2561,7 @@ public:
 protected:
     explicit Unit (bool isWorldObject);
 
-    void BuildValuesUpdate(uint8 updatetype, ByteBuffer* data, Player* target) const override;
+    void BuildValuesUpdate(uint8 updateType, ByteBuffer* data, Player* target) override;
 
     UnitAI* i_AI, *i_disabledAI;
 
@@ -2598,6 +2654,9 @@ private:
     [[nodiscard]] float GetCombatRatingReduction(CombatRating cr) const;
     [[nodiscard]] uint32 GetCombatRatingDamageReduction(CombatRating cr, float rate, float cap, uint32 damage) const;
 
+    void PatchValuesUpdate(ByteBuffer& valuesUpdateBuf, BuildValuesCachePosPointers& posPointers, Player* target);
+    void InvalidateValuesUpdateCache() { _valuesUpdateCache.clear(); }
+
 protected:
     void SetFeared(bool apply, Unit* fearedBy = nullptr, bool isFear = false);
     void SetConfused(bool apply);
@@ -2635,6 +2694,9 @@ private:
     uint32 _lastExtraAttackSpell;
     std::unordered_map<ObjectGuid /*guid*/, uint32 /*count*/> extraAttacksTargets;
     ObjectGuid _lastDamagedTargetGuid;
+
+    typedef std::unordered_map<uint64 /*visibleFlag(uint32) + updateType(uint8)*/, BuildValuesCachedBuffer>  ValuesUpdateCache;
+    ValuesUpdateCache _valuesUpdateCache;
 };
 
 namespace Acore

src/server/game/Scripting/ScriptDefines/UnitScript.cpp

@@ -192,18 +192,24 @@ bool ScriptMgr::IsCustomBuildValuesUpdate(Unit const* unit, uint8 updateType, By
     return false;
 }
 
-bool ScriptMgr::OnBuildValuesUpdate(Unit const* unit, uint8 updateType, ByteBuffer& fieldBuffer, Player* target, uint16 index)
+bool ScriptMgr::ShouldTrackValuesUpdatePosByIndex(Unit const* unit, uint8 updateType, uint16 index)
 {
-    auto ret = IsValidBoolScript<UnitScript>([&](UnitScript* script) { return script->OnBuildValuesUpdate(unit, updateType, fieldBuffer, target, index); });
+    auto ret = IsValidBoolScript<UnitScript>([&](UnitScript* script) { return script->ShouldTrackValuesUpdatePosByIndex(unit, updateType, index); });
 
     if (ret && *ret)
-    {
         return true;
-    }
 
     return false;
 }
 
+void ScriptMgr::OnPatchValuesUpdate(Unit const* unit, ByteBuffer& valuesUpdateBuf, BuildValuesCachePosPointers& posPointers, Player* target)
+{
+    ExecuteScript<UnitScript>([&](UnitScript* script)
+    {
+        script->OnPatchValuesUpdate(unit, valuesUpdateBuf, posPointers, target);
+    });
+}
+
 void ScriptMgr::OnUnitUpdate(Unit* unit, uint32 diff)
 {
     ExecuteScript<UnitScript>([&](UnitScript* script)

src/server/game/Scripting/ScriptDefines/UnitScript.h

@@ -22,6 +22,7 @@
 
 enum ReputationRank : uint8;
 class ByteBuffer;
+struct BuildValuesCachePosPointers;
 
 class UnitScript : public ScriptObject
 {
@@ -69,7 +70,9 @@ public:
 
     [[nodiscard]] virtual bool IsCustomBuildValuesUpdate(Unit const* /*unit*/, uint8 /*updateType*/, ByteBuffer& /*fieldBuffer*/, Player const* /*target*/, uint16 /*index*/) { return false; }
 
-    [[nodiscard]] virtual bool OnBuildValuesUpdate(Unit const* /*unit*/, uint8 /*updateType*/, ByteBuffer& /*fieldBuffer*/, Player* /*target*/, uint16 /*index*/) { return false; }
+    [[nodiscard]] virtual bool ShouldTrackValuesUpdatePosByIndex(Unit const* /*unit*/, uint8 /*updateType*/, uint16 /*index*/) { return false; }
+
+    virtual void OnPatchValuesUpdate(Unit const* /*unit*/, ByteBuffer& /*valuesUpdateBuf*/, BuildValuesCachePosPointers& /*posPointers*/, Player* /*target*/) { }
 
     /**
      * @brief This hook runs in Unit::Update

src/server/game/Scripting/ScriptMgr.h

@@ -548,7 +548,8 @@ public: /* UnitScript */
     bool IsNeedModHealPercent(Unit const* unit, AuraEffect* auraEff, float& doneTotalMod, SpellInfo const* spellProto);
     bool CanSetPhaseMask(Unit const* unit, uint32 newPhaseMask, bool update);
     bool IsCustomBuildValuesUpdate(Unit const* unit, uint8 updateType, ByteBuffer& fieldBuffer, Player const* target, uint16 index);
-    bool OnBuildValuesUpdate(Unit const* unit, uint8 updateType, ByteBuffer& fieldBuffer, Player* target, uint16 index);
+    bool ShouldTrackValuesUpdatePosByIndex(Unit const* unit, uint8 updateType, uint16 index);
+    void OnPatchValuesUpdate(Unit const* unit, ByteBuffer& valuesUpdateBuf, BuildValuesCachePosPointers& posPointers, Player* target);
     void OnUnitUpdate(Unit* unit, uint32 diff);
     void OnDisplayIdChange(Unit* unit, uint32 displayId);
     void OnUnitEnterEvadeMode(Unit* unit, uint8 why);