Implement sun damage based on the research on the wiki

CHANGELOG.md

@@ -13,6 +13,7 @@
     Bug #6949: Sun Damage effect doesn't work in quasi exteriors
     Bug #6964: Nerasa Dralor Won't Follow
     Bug #6974: Only harmful effects are reflected
+    Bug #6977: Sun damage implementation does not match research
     Bug #6986: Sound magic effect does not make noise
     Bug #6987: Set/Mod Blindness should not darken the screen
     Bug #6992: Crossbow reloading doesn't look the same as in Morrowind

apps/openmw/mwbase/world.hpp

@@ -564,6 +564,9 @@ namespace MWBase
             // Allow NPCs to use torches?
             virtual bool useTorches() const = 0;
 
+            virtual float getSunVisibility() const = 0;
+            virtual float getSunPercentage() const = 0;
+
             virtual bool findInteriorPositionInWorldSpace(const MWWorld::CellStore* cell, osg::Vec3f& result) = 0;
 
             /// Teleports \a ptr to the closest reference of \a id (e.g. DivineMarker, PrisonMarker, TempleMarker)

apps/openmw/mwmechanics/spelleffects.cpp

@@ -664,15 +664,9 @@ void applyMagicEffect(const MWWorld::Ptr& target, const MWWorld::Ptr& caster, co
                 // isInCell shouldn't be needed, but updateActor called during game start
                 if (!target.isInCell() || !(target.getCell()->isExterior() || target.getCell()->isQuasiExterior()) || godmode)
                     break;
-                float time = world->getTimeStamp().getHour();
+                const float sunRisen = world->getSunPercentage();
-                float timeDiff = std::clamp(std::abs(time - 13.f), 0.f, 7.f);
-                float damageScale = 1.f - timeDiff / 7.f;
-                // When cloudy, the sun damage effect is halved
                 static float fMagicSunBlockedMult = world->getStore().get<ESM::GameSetting>().find("fMagicSunBlockedMult")->mValue.getFloat();
-
+                const float damageScale = std::clamp(std::max(world->getSunVisibility() * sunRisen, fMagicSunBlockedMult * sunRisen), 0.f, 1.f);
-                int weather = world->getCurrentWeather();
-                if (weather > 1)
-                    damageScale *= fMagicSunBlockedMult;
                 float damage = effect.mMagnitude * damageScale;
                 adjustDynamicStat(target, 0, -damage);
                 if (damage > 0.f)

apps/openmw/mwworld/weather.cpp

@@ -176,8 +176,8 @@ namespace
         , mParticleEffect(particleEffect)
         , mRainEffect(Fallback::Map::getBool("Weather_" + name + "_Using_Precip") ? "meshes\\raindrop.nif" : "")
         , mStormDirection(Weather::defaultDirection())
-        , mTransitionDelta(Fallback::Map::getFloat("Weather_" + name + "_Transition_Delta"))
         , mCloudsMaximumPercent(Fallback::Map::getFloat("Weather_" + name + "_Clouds_Maximum_Percent"))
+        , mTransitionDelta(Fallback::Map::getFloat("Weather_" + name + "_Transition_Delta"))
         , mThunderFrequency(Fallback::Map::getFloat("Weather_" + name + "_Thunder_Frequency"))
         , mThunderThreshold(Fallback::Map::getFloat("Weather_" + name + "_Thunder_Threshold"))
         , mThunderSoundID()
@@ -875,6 +875,27 @@ namespace
         return isDark && !mPrecipitation;
     }
 
+    float WeatherManager::getSunPercentage(float hour) const
+    {
+        if (hour <= mTimeSettings.mNightEnd || hour >= mTimeSettings.mNightStart)
+            return 0.f;
+        else if (hour <= mTimeSettings.mDayStart)
+            return (hour - mTimeSettings.mNightEnd) / mSunriseDuration;
+        else if (hour > mTimeSettings.mDayEnd)
+            return 1.f - ((hour - mTimeSettings.mDayEnd) / mSunsetDuration);
+        return 1.f;
+    }
+
+    float WeatherManager::getSunVisibility() const
+    {
+        if (inTransition() && mTransitionFactor < mWeatherSettings[mNextWeather].mCloudsMaximumPercent)
+        {
+            float t = mTransitionFactor / mWeatherSettings[mNextWeather].mCloudsMaximumPercent;
+            return (1.f - t) * mWeatherSettings[mCurrentWeather].mGlareView + t * mWeatherSettings[mNextWeather].mGlareView;
+        }
+        return mWeatherSettings[mCurrentWeather].mGlareView;
+    }
+
     void WeatherManager::write(ESM::ESMWriter& writer, Loading::Listener& progress)
     {
         ESM::WeatherState state;
@@ -1072,7 +1093,7 @@ namespace
         mQueuedWeather = invalidWeatherID;
     }
 
-    inline bool WeatherManager::inTransition()
+    inline bool WeatherManager::inTransition() const
     {
         return mNextWeather != invalidWeatherID;
     }

apps/openmw/mwworld/weather.hpp

@@ -193,6 +193,8 @@ namespace MWWorld
 
         osg::Vec3f mStormDirection;
 
+        float mCloudsMaximumPercent;
+
         // Note: For Weather Blight, there is a "Disease Chance" (=0.1) setting. But according to MWSFD this feature
         // is broken in the vanilla game and was disabled.
 
@@ -203,7 +205,6 @@ namespace MWWorld
 
     private:
         float mTransitionDelta;
-        float mCloudsMaximumPercent;
 
         // Note: In MW, only thunderstorms support these attributes, but in the interest of making weather more
         // flexible, these settings are imported for all weather types. Only thunderstorms will normally have any
@@ -315,6 +316,10 @@ namespace MWWorld
 
         bool useTorches(float hour) const;
 
+        float getSunPercentage(float hour) const;
+
+        float getSunVisibility() const;
+
         void write(ESM::ESMWriter& writer, Loading::Listener& progress);
 
         bool readRecord(ESM::ESMReader& reader, uint32_t type);
@@ -379,7 +384,7 @@ namespace MWWorld
         void updateWeatherTransitions(const float elapsedRealSeconds);
         void forceWeather(const int weatherID);
 
-        bool inTransition();
+        bool inTransition() const;
         void addWeatherTransition(const int weatherID);
 
         void calculateWeatherResult(const float gameHour, const float elapsedSeconds, const bool isPaused);

apps/openmw/mwworld/worldimp.cpp

@@ -3260,6 +3260,16 @@ namespace MWWorld
         }
     }
 
+    float World::getSunVisibility() const
+    {
+        return mWeatherManager->getSunVisibility();
+    }
+
+    float World::getSunPercentage() const
+    {
+        return mWeatherManager->getSunPercentage(getTimeStamp().getHour());
+    }
+
     bool World::findInteriorPositionInWorldSpace(const MWWorld::CellStore* cell, osg::Vec3f& result)
     {
         if (cell->isExterior())

apps/openmw/mwworld/worldimp.hpp

@@ -668,6 +668,9 @@ namespace MWWorld
             // Allow NPCs to use torches?
             bool useTorches() const override;
 
+            float getSunVisibility() const override;
+            float getSunPercentage() const override;
+
             bool findInteriorPositionInWorldSpace(const MWWorld::CellStore* cell, osg::Vec3f& result) override;
 
             /// Teleports \a ptr to the closest reference of \a id (e.g. DivineMarker, PrisonMarker, TempleMarker)