Core/Auras: Reimplement SPELL_AURA_MOD_ARMOR_PENETRATION_PCT, it is back from the dead (#30410)

3 files changed, 10 insertions, 4 deletions

diff --git a/src/server/game/Entities/Unit/Unit.cpp b/src/server/game/Entities/Unit/Unit.cpp
index 7c3d7514ffc..03376801b3e 100644
--- a/src/server/game/Entities/Unit/Unit.cpp
+++ b/src/server/game/Entities/Unit/Unit.cpp
@@ -1661,7 +1661,7 @@ void Unit::HandleEmoteCommand(Emote emoteId, Player* target /*=nullptr*/, Trinit
     return !spellInfo || !spellInfo->HasAttribute(SPELL_ATTR0_CU_IGNORE_ARMOR);
 }
 
-/*static*/ uint32 Unit::CalcArmorReducedDamage(Unit const* attacker, Unit* victim, uint32 damage, SpellInfo const* spellInfo, WeaponAttackType /*attackType*/ /*= MAX_ATTACK*/, uint8 attackerLevel /*= 0*/)
+/*static*/ uint32 Unit::CalcArmorReducedDamage(Unit const* attacker, Unit* victim, uint32 damage, SpellInfo const* spellInfo, WeaponAttackType attackType /*= MAX_ATTACK*/, uint8 attackerLevel /*= 0*/)
 {
     float armor = float(victim->GetArmor());
 
@@ -1691,11 +1691,17 @@ void Unit::HandleEmoteCommand(Emote emoteId, Player* target /*=nullptr*/, Trinit
                 armor = std::floor(AddPct(armor, -aurEff->GetAmount()));
         }
 
-        // Apply Player CR_ARMOR_PENETRATION rating
+        // Apply Player CR_ARMOR_PENETRATION rating and buffs from stances\specializations etc.
         if (attacker->GetTypeId() == TYPEID_PLAYER)
         {
             float arpPct = attacker->ToPlayer()->GetRatingBonusValue(CR_ARMOR_PENETRATION);
 
+            Item const* weapon = attacker->ToPlayer()->GetWeaponForAttack(attackType, true);
+            arpPct += attacker->GetTotalAuraModifier(SPELL_AURA_MOD_ARMOR_PENETRATION_PCT, [weapon](AuraEffect const* aurEff) -> bool
+            {
+                return aurEff->GetSpellInfo()->IsItemFitToSpellRequirements(weapon);
+            });
+
             // no more than 100%
             RoundToInterval(arpPct, 0.f, 100.f);
 
diff --git a/src/server/game/Spells/Auras/SpellAuraDefines.h b/src/server/game/Spells/Auras/SpellAuraDefines.h
index 16524552f3a..d5c86f32b25 100644
--- a/src/server/game/Spells/Auras/SpellAuraDefines.h
+++ b/src/server/game/Spells/Auras/SpellAuraDefines.h
@@ -371,7 +371,7 @@ enum AuraType : uint32
     SPELL_AURA_277                                          = 277,  // old SPELL_AURA_MOD_MAX_AFFECTED_TARGETS. unused 4.3.4
     SPELL_AURA_MOD_DISARM_RANGED                            = 278,
     SPELL_AURA_INITIALIZE_IMAGES                            = 279,
-    SPELL_AURA_280                                          = 280,  // old SPELL_AURA_MOD_ARMOR_PENETRATION_PCT unused 4.3.4
+    SPELL_AURA_MOD_ARMOR_PENETRATION_PCT                    = 280,
     SPELL_AURA_PROVIDE_SPELL_FOCUS                          = 281,
     SPELL_AURA_MOD_BASE_HEALTH_PCT                          = 282,
     SPELL_AURA_MOD_HEALING_RECEIVED                         = 283,  // Possibly only for some spell family class spells
diff --git a/src/server/game/Spells/Auras/SpellAuraEffects.cpp b/src/server/game/Spells/Auras/SpellAuraEffects.cpp
index 9aa9a9c5787..3c65a72b5f8 100644
--- a/src/server/game/Spells/Auras/SpellAuraEffects.cpp
+++ b/src/server/game/Spells/Auras/SpellAuraEffects.cpp
@@ -349,7 +349,7 @@ NonDefaultConstructible<pAuraEffectHandler> AuraEffectHandler[TOTAL_AURAS]=
     &AuraEffect::HandleUnused,                                    //277 unused (4.3.4) old SPELL_AURA_MOD_MAX_AFFECTED_TARGETS
     &AuraEffect::HandleAuraModDisarm,                             //278 SPELL_AURA_MOD_DISARM_RANGED disarm ranged weapon
     &AuraEffect::HandleNoImmediateEffect,                         //279 SPELL_AURA_INITIALIZE_IMAGES
-    &AuraEffect::HandleUnused,                                    //280 unused (4.3.4) old SPELL_AURA_MOD_ARMOR_PENETRATION_PCT
+    &AuraEffect::HandleNoImmediateEffect,                         //280 SPELL_AURA_MOD_ARMOR_PENETRATION_PCT implemented in Unit::CalcArmorReducedDamage
     &AuraEffect::HandleNoImmediateEffect,                         //281 SPELL_AURA_PROVIDE_SPELL_FOCUS implemented in Spell::CheckCast
     &AuraEffect::HandleAuraIncreaseBaseHealthPercent,             //282 SPELL_AURA_MOD_BASE_HEALTH_PCT
     &AuraEffect::HandleNoImmediateEffect,                         //283 SPELL_AURA_MOD_HEALING_RECEIVED       implemented in Unit::SpellHealingBonus