Magic armor mitigation for creatures (feature #5033)

CHANGELOG.md

@@ -114,6 +114,7 @@
     Feature #5000: Compressed BSA format support
     Feature #5010: Native graphics herbalism support
     Feature #5031: Make GetWeaponType function return different values for tools
+    Feature #5033: Magic armor mitigation for creatures
     Task #4686: Upgrade media decoder to a more current FFmpeg API
     Task #4695: Optimize Distant Terrain memory consumption
     Task #4721: Add NMake support to the Windows prebuild script

apps/openmw/mwclass/creature.cpp

@@ -401,10 +401,10 @@ namespace MWClass
                     stats.setHitRecovery(true); // Is this supposed to always occur?
             }
 
-            damage = std::max(1.f, damage);
-
             if(ishealth)
             {
+                damage *= damage / (damage + getArmorRating(ptr));
+                damage = std::max(1.f, damage);
                 if (!attacker.isEmpty())
                 {
                     damage = scaleDamage(damage, attacker, ptr);
@@ -597,7 +597,7 @@ namespace MWClass
 
     float Creature::getArmorRating (const MWWorld::Ptr& ptr) const
     {
-        // Note this is currently unused. Creatures do not use armor mitigation.
+        // Equipment armor rating is deliberately ignored.
         return getCreatureStats(ptr).getMagicEffects().get(ESM::MagicEffect::Shield).getMagnitude();
     }
 

apps/openmw/mwworld/inventorystore.cpp

@@ -571,8 +571,8 @@ void MWWorld::InventoryStore::autoEquip (const MWWorld::Ptr& actor)
 
     // Autoequip clothing, armor and weapons.
     // Equipping lights is handled in Actors::updateEquippedLight based on environment light.
-    // Note: creatures do not use the armor mitigation and can equip only shields
-    // Use a custom logic for them - select shield based on its health instead of armor rating (since it useless for creatures)
+    // Note: creatures ignore equipment armor rating and only equip shields
+    // Use custom logic for them - select shield based on its health instead of armor rating
     autoEquipWeapon(actor, slots_);
     autoEquipArmor(actor, slots_);