Cache awareness rolls for 5 seconds to make sneaking easier

apps/openmw/mwmechanics/actors.cpp

@@ -409,6 +409,7 @@ namespace MWMechanics
 
     void Actors::updateActor(const MWWorld::Ptr& ptr, float duration) const
     {
+        ptr.getClass().getCreatureStats(ptr).updateAwareness(duration);
         // magic effects
         adjustMagicEffects(ptr, duration);
 

apps/openmw/mwmechanics/creaturestats.cpp

@@ -686,4 +686,24 @@ namespace MWMechanics
     {
         return mSummonGraveyard;
     }
+
+    void CreatureStats::updateAwareness(float duration)
+    {
+        mAwarenessTimer += duration;
+        // Only reroll for awareness every 5 seconds
+        if (mAwarenessTimer >= 5.f)
+        {
+            mAwarenessTimer = 0.f;
+            mAwarenessRoll = -1;
+        }
+    }
+
+    int CreatureStats::getAwarenessRoll()
+    {
+        if (mAwarenessRoll >= 0)
+            return mAwarenessRoll;
+        auto& prng = MWBase::Environment::get().getWorld()->getPrng();
+        mAwarenessRoll = Misc::Rng::roll0to99(prng);
+        return mAwarenessRoll;
+    }
 }

apps/openmw/mwmechanics/creaturestats.hpp

@@ -90,6 +90,9 @@ namespace MWMechanics
         // This may be necessary when the creature is in an inactive cell.
         std::vector<int> mSummonGraveyard;
 
+        float mAwarenessTimer = 0.f;
+        int mAwarenessRoll = -1;
+
     protected:
         std::string mAttackType;
         int mLevel = 0;
@@ -300,6 +303,9 @@ namespace MWMechanics
         void setTeleported(bool v) { mTeleported = v; }
 
         const std::map<ESM::RefId, AttributeValue>& getAttributes() const { return mAttributes; }
+
+        void updateAwareness(float duration);
+        int getAwarenessRoll();
     };
 }
 

apps/openmw/mwmechanics/mechanicsmanagerimp.cpp

@@ -1675,8 +1675,7 @@ namespace MWMechanics
         }
 
         float target = x - y;
-        auto& prng = MWBase::Environment::get().getWorld()->getPrng();
-        return (Misc::Rng::roll0to99(prng) >= target);
+        return observerStats.getAwarenessRoll() >= target;
     }
 
     void MechanicsManager::startCombat(