Implement Resist & Weakness effects

apps/openmw/CMakeLists.txt

@@ -69,7 +69,7 @@ add_openmw_dir (mwclass
 add_openmw_dir (mwmechanics
     mechanicsmanagerimp stat character creaturestats magiceffects movement actors objects
     drawstate spells activespells npcstats aipackage aisequence alchemy aiwander aitravel aifollow
-    aiescort aiactivate repair enchanting pathfinding security spellsuccess
+    aiescort aiactivate repair enchanting pathfinding security spellsuccess spellcasting
     )
 
 add_openmw_dir (mwbase

apps/openmw/mwclass/npc.cpp

@@ -468,9 +468,9 @@ namespace MWClass
                 {
                     weapon.getCellRef().mEnchantmentCharge -= castCost;
                     // Touch
-                    othercls.getCreatureStats(victim).getActiveSpells().addSpell(enchantmentName, victim, ESM::RT_Touch, weapon.getClass().getName(weapon));
+                    othercls.getCreatureStats(victim).getActiveSpells().addSpell(enchantmentName, victim, ptr, ESM::RT_Touch, weapon.getClass().getName(weapon));
                     // Self
-                    getCreatureStats(ptr).getActiveSpells().addSpell(enchantmentName, ptr, ESM::RT_Self, weapon.getClass().getName(weapon));
+                    getCreatureStats(ptr).getActiveSpells().addSpell(enchantmentName, ptr, ptr, ESM::RT_Self, weapon.getClass().getName(weapon));
                     // Target
                     MWBase::Environment::get().getWorld()->launchProjectile(enchantmentName, enchantment->mEffects, ptr, weapon.getClass().getName(weapon));
                 }
@@ -936,7 +936,7 @@ namespace MWClass
 
         /// \todo consider instant effects
 
-        return stats.getActiveSpells().addSpell (id, actor);
+        return stats.getActiveSpells().addSpell (id, actor, actor);
     }
 
     void Npc::skillUsageSucceeded (const MWWorld::Ptr& ptr, int skill, int usageType) const

apps/openmw/mwgui/quickkeysmenu.cpp

@@ -5,7 +5,7 @@
 #include "../mwworld/player.hpp"
 #include "../mwworld/inventorystore.hpp"
 #include "../mwworld/actionequip.hpp"
-#include "../mwmechanics/spellsuccess.hpp"
+#include "../mwmechanics/spellcasting.hpp"
 #include "../mwgui/inventorywindow.hpp"
 #include "../mwgui/bookwindow.hpp"
 #include "../mwgui/scrollwindow.hpp"

apps/openmw/mwgui/spellwindow.cpp

@@ -9,7 +9,7 @@
 #include "../mwworld/inventorystore.hpp"
 #include "../mwworld/actionequip.hpp"
 
-#include "../mwmechanics/spellsuccess.hpp"
+#include "../mwmechanics/spellcasting.hpp"
 
 #include "spellicons.hpp"
 #include "inventorywindow.hpp"

apps/openmw/mwmechanics/activespells.cpp

@@ -16,11 +16,14 @@
 #include "../mwbase/environment.hpp"
 #include "../mwbase/world.hpp"
 #include "../mwbase/soundmanager.hpp"
+#include "../mwbase/windowmanager.hpp"
 
 #include "../mwrender/animation.hpp"
 
 #include "../mwworld/class.hpp"
 
+#include "../mwmechanics/spellcasting.hpp"
+
 #include "creaturestats.hpp"
 #include "npcstats.hpp"
 
@@ -74,7 +77,7 @@ namespace MWMechanics
             for (std::vector<ESM::ENAMstruct>::const_iterator effectIter (effects.first.mList.begin());
                 effectIter!=effects.first.mList.end(); ++effectIter, ++i)
             {
-                float magnitude = iter->second.mRandom[i];
+                float random = iter->second.mRandom[i];
                 if (effectIter->mRange != iter->second.mRange)
                     continue;
 
@@ -83,7 +86,7 @@ namespace MWMechanics
                     int duration = effectIter->mDuration;
                     
                     if (effects.second.first)
-                        duration *= magnitude;
+                        duration *= random;
                     
                     MWWorld::TimeStamp end = start;
                     end += static_cast<double> (duration)*
@@ -102,19 +105,21 @@ namespace MWMechanics
                             if (effectIter->mDuration==0)
                             {
                                 param.mMagnitude =
-                                    static_cast<int> (magnitude / (0.1 * magicEffect->mData.mBaseCost));
+                                    static_cast<int> (random / (0.1 * magicEffect->mData.mBaseCost));
                             }
                             else
                             {
                                 param.mMagnitude =
-                                    static_cast<int> (0.05*magnitude / (0.1 * magicEffect->mData.mBaseCost));
+                                    static_cast<int> (0.05*random / (0.1 * magicEffect->mData.mBaseCost));
                             }
                         }
                         else
                             param.mMagnitude = static_cast<int> (
-                                (effectIter->mMagnMax-effectIter->mMagnMin)*magnitude + effectIter->mMagnMin);
-                                
-                        mEffects.add (*effectIter, param);
+                                (effectIter->mMagnMax-effectIter->mMagnMin)*random + effectIter->mMagnMin);
+                        param.mMagnitude *= iter->second.mMultiplier[i];
+
+                        if (param.mMagnitude)
+                            mEffects.add (*effectIter, param);
                     }
                 }
             }
@@ -185,7 +190,7 @@ namespace MWMechanics
     : mSpellsChanged (false), mLastUpdate (MWBase::Environment::get().getWorld()->getTimeStamp())
     {}
 
-    bool ActiveSpells::addSpell (const std::string& id, const MWWorld::Ptr& actor, ESM::RangeType range, const std::string& name, int effectIndex)
+    bool ActiveSpells::addSpell (const std::string& id, const MWWorld::Ptr& actor, const MWWorld::Ptr& caster, ESM::RangeType range, const std::string& name, int effectIndex)
     {
         const CreatureStats& creatureStats = MWWorld::Class::get (actor).getCreatureStats (actor);
 
@@ -197,6 +202,8 @@ namespace MWMechanics
         for (std::vector<ESM::ENAMstruct>::const_iterator iter (effects.first.mList.begin());
             iter!=effects.first.mList.end(); ++iter)
         {
+            if (iter->mRange != range)
+                continue;
             if (iter->mDuration)
             {
                 found = true;
@@ -204,41 +211,37 @@ namespace MWMechanics
             }
         }
 
+        // If none of the effects need to apply, no need to add the spell
         if (!found)
             return false;
 
         TContainer::iterator iter = mSpells.find (id);
 
-        float random = static_cast<float> (std::rand()) / RAND_MAX;
-
-        if (effects.second.first)
-        {
-            // ingredient -> special treatment required.
-            const NpcStats& npcStats = MWWorld::Class::get (actor).getNpcStats (actor);
-        
-            float x =
-                (npcStats.getSkill (ESM::Skill::Alchemy).getModified() +
-                0.2 * creatureStats.getAttribute (1).getModified()
-                + 0.1 * creatureStats.getAttribute (7).getModified())
-                * creatureStats.getFatigueTerm();
-            random *= 100;
-            random = random / std::min (x, 100.0f);
-            random *= 0.25 * x;
-        }
-
         ActiveSpellParams params;
         for (unsigned int i=0; i<effects.first.mList.size(); ++i)
-            params.mRandom.push_back(static_cast<float> (std::rand()) / RAND_MAX);
+        {
+            float random = static_cast<float> (std::rand()) / RAND_MAX;
+            if (effects.second.first)
+            {
+                // ingredient -> special treatment required.
+                const NpcStats& npcStats = MWWorld::Class::get (actor).getNpcStats (actor);
+
+                float x =
+                    (npcStats.getSkill (ESM::Skill::Alchemy).getModified() +
+                    0.2 * creatureStats.getAttribute (1).getModified()
+                    + 0.1 * creatureStats.getAttribute (7).getModified())
+                    * creatureStats.getFatigueTerm();
+                random *= 100;
+                random = random / std::min (x, 100.0f);
+                random *= 0.25 * x;
+            }
+
+            params.mRandom.push_back(random);
+        }
         params.mRange = range;
         params.mTimeStamp = MWBase::Environment::get().getWorld()->getTimeStamp();
         params.mName = name;
-
-        if (iter==mSpells.end() || stacks)
-            mSpells.insert (std::make_pair (id, params));
-        else
-            iter->second = params;
-
-
+        params.mMultiplier.resize(effects.first.mList.size(), 1);
 
         /*
         for (int i=0; i<effects.first.mList.size(); ++i)
@@ -258,19 +261,35 @@ namespace MWMechanics
         }
         */
 
-        // Play sounds & particles
         bool first=true;
-        for (std::vector<ESM::ENAMstruct>::const_iterator iter (effects.first.mList.begin());
-            iter!=effects.first.mList.end(); ++iter)
+        int i = 0;
+        for (std::vector<ESM::ENAMstruct>::const_iterator effectIt (effects.first.mList.begin());
+            effectIt!=effects.first.mList.end(); ++effectIt, ++i)
         {
-            if (iter->mRange != range)
+            if (effectIt->mRange != range)
+                continue;
+
+            // Try resisting effect in case its harmful
+            const ESM::Spell *spell =
+                        MWBase::Environment::get().getWorld()->getStore().get<ESM::Spell>().search (id);
+            params.mMultiplier[i] = MWMechanics::getEffectMultiplier(effectIt->mEffectID, actor, caster, spell);
+            if (params.mMultiplier[i] == 0)
+            {
+                if (actor.getRefData().getHandle() == "player")
+                    MWBase::Environment::get().getWindowManager()->messageBox("#{sMagicPCResisted}");
+                else
+                    MWBase::Environment::get().getWindowManager()->messageBox("#{sMagicTargetResisted}");
+            }
+
+            // If fully resisted, don't play sounds or particles
+            if (params.mMultiplier[i] == 0)
                 continue;
 
             // TODO: For Area effects, launch a growing particle effect that applies the effect to more actors as it hits them. Best managed in World.
 
             const ESM::MagicEffect *magicEffect =
                 MWBase::Environment::get().getWorld()->getStore().get<ESM::MagicEffect>().find (
-                iter->mEffectID);
+                effectIt->mEffectID);
 
             // Only the sound of the first effect plays
             if (first)
@@ -296,6 +315,11 @@ namespace MWMechanics
             first = false;
         }
 
+        if (iter==mSpells.end() || stacks)
+            mSpells.insert (std::make_pair (id, params));
+        else
+            iter->second = params;
+
         mSpellsChanged = true;
 
         return true;
@@ -415,7 +439,9 @@ namespace MWMechanics
                     magnitude = static_cast<int> (0.05*it->second.mRandom[i] / (0.1 * magicEffect->mData.mBaseCost));
                 }
 
-                visitor.visit(*effectIt, name, magnitude, remainingTime);
+                magnitude *= it->second.mMultiplier[i];
+                if (magnitude)
+                    visitor.visit(*effectIt, name, magnitude, remainingTime);
             }
         }
     }

apps/openmw/mwmechanics/activespells.hpp

@@ -37,7 +37,7 @@ namespace MWMechanics
 
         // Effect magnitude multiplier. Use 0 to completely disable the effect
         // (if it was resisted, reflected or absorbed). Use (0,1) for partially resisted.
-        std::vector<bool> mMultiplier;
+        std::vector<float> mMultiplier;
 
         // Display name, we need this for enchantments, which don't have a name - so you need to supply the
         // name of the item with the enchantment to addSpell
@@ -85,11 +85,12 @@ namespace MWMechanics
 
             ActiveSpells();
 
-            bool addSpell (const std::string& id, const MWWorld::Ptr& actor, ESM::RangeType range = ESM::RT_Self, const std::string& name = "", int effectIndex = -1);
+            bool addSpell (const std::string& id, const MWWorld::Ptr& actor, const MWWorld::Ptr& caster, ESM::RangeType range = ESM::RT_Self, const std::string& name = "", int effectIndex = -1);
             ///< Overwrites an existing spell with the same ID. If the spell does not have any
             /// non-instant effects, it is ignored.
             /// @param id
-            /// @param actor
+            /// @param actor actor to add the spell to
+            /// @param caster actor who casted the spell
             /// @param range Only effects with range type \a range will be applied
             /// @param name Display name for enchantments, since they don't have a name in their record
             /// @param effectIndex Only apply one specific effect - useful for reflecting spells, since each effect is reflected individually

apps/openmw/mwmechanics/spellcasting.hpp

@@ -114,6 +114,72 @@ namespace MWMechanics
         return school;
     }
 
+    /// @return >=100 for fully resisted. can also return negative value for damage amplification.
+    inline float getEffectResistance (short effectId, const MWWorld::Ptr& actor, const MWWorld::Ptr& caster, const ESM::Spell* spell = NULL)
+    {
+        const ESM::MagicEffect *magicEffect =
+            MWBase::Environment::get().getWorld()->getStore().get<ESM::MagicEffect>().find (
+            effectId);
+
+        const MWMechanics::CreatureStats& stats = actor.getClass().getCreatureStats(actor);
+
+        float resisted = 0;
+        if (magicEffect->mData.mFlags & ESM::MagicEffect::Harmful)
+        {
+
+            short resistanceEffect = ESM::MagicEffect::getResistanceEffect(effectId);
+            short weaknessEffect = ESM::MagicEffect::getWeaknessEffect(effectId);
+
+            float resistance = 0;
+            if (resistanceEffect != -1)
+                resistance += stats.getMagicEffects().get(resistanceEffect).mMagnitude;
+            if (weaknessEffect != -1)
+                resistance -= stats.getMagicEffects().get(weaknessEffect).mMagnitude;
+
+
+            float willpower = stats.getAttribute(ESM::Attribute::Willpower).getModified();
+            float luck = stats.getAttribute(ESM::Attribute::Luck).getModified();
+            float x = (willpower + 0.1 * luck) * stats.getFatigueTerm();
+
+            // This makes spells that are easy to cast harder to resist and vice versa
+            if (spell != NULL)
+            {
+                float castChance = getSpellSuccessChance(spell, caster);
+                if (castChance > 0)
+                    x *= 50 / castChance;
+            }
+
+            float roll = static_cast<float>(std::rand()) / RAND_MAX * 100;
+            if (magicEffect->mData.mFlags & ESM::MagicEffect::NoMagnitude)
+                roll -= resistance;
+
+            if (x <= roll)
+                x = 0;
+            else
+            {
+                if (magicEffect->mData.mFlags & ESM::MagicEffect::NoMagnitude)
+                    x = 100;
+                else
+                    x = roll / std::min(x, 100.f);
+            }
+
+            x = std::min(x + resistance, 100.f);
+
+            resisted = x;
+        }
+
+        return resisted;
+    }
+
+    inline float getEffectMultiplier(short effectId, const MWWorld::Ptr& actor, const MWWorld::Ptr& caster, const ESM::Spell* spell = NULL)
+    {
+        float resistance = getEffectResistance(effectId, actor, caster, spell);
+        if (resistance >= 0)
+            return 1 - resistance / 100.f;
+        else
+            return -(resistance-100) / 100.f;
+    }
+
 }
 
 #endif

apps/openmw/mwworld/actiontrap.cpp

@@ -16,7 +16,7 @@ namespace MWWorld
         // TODO: Apply RT_Self effects on the door / container that triggered the trap. Not terribly useful, but you could
         // make it lock itself when activated for example.
 
-        actor.getClass().getCreatureStats(actor).getActiveSpells().addSpell(mSpellId, actor, ESM::RT_Touch);
+        actor.getClass().getCreatureStats(actor).getActiveSpells().addSpell(mSpellId, actor, actor, ESM::RT_Touch);
 
         const ESM::Spell* spell = MWBase::Environment::get().getWorld()->getStore().get<ESM::Spell>().find(mSpellId);
 

apps/openmw/mwworld/inventorystore.cpp

@@ -11,6 +11,8 @@
 #include "../mwbase/windowmanager.hpp"
 
 #include "../mwmechanics/npcstats.hpp"
+#include "../mwmechanics/spellcasting.hpp"
+
 
 #include "esmstore.hpp"
 #include "class.hpp"
@@ -292,47 +294,37 @@ void MWWorld::InventoryStore::updateMagicEffects(const Ptr& actor)
             if (enchantment.mData.mType != ESM::Enchantment::ConstantEffect)
                 continue;
 
-            // Roll some dice, one for each effect
             std::vector<EffectParams> params;
-            params.resize(enchantment.mEffects.mList.size());
-            for (unsigned int i=0; i<params.size();++i)
-                params[i].mRandom = static_cast<float> (std::rand()) / RAND_MAX;
 
             bool existed = (mPermanentMagicEffectMagnitudes.find((**iter).getCellRef().mRefID) != mPermanentMagicEffectMagnitudes.end());
             if (!existed)
             {
+                // Roll some dice, one for each effect
+                params.resize(enchantment.mEffects.mList.size());
+                for (unsigned int i=0; i<params.size();++i)
+                    params[i].mRandom = static_cast<float> (std::rand()) / RAND_MAX;
+
                 // Try resisting each effect
                 int i=0;
                 for (std::vector<ESM::ENAMstruct>::const_iterator effectIt (enchantment.mEffects.mList.begin());
                     effectIt!=enchantment.mEffects.mList.end(); ++effectIt)
                 {
-                    const ESM::MagicEffect *magicEffect =
-                        MWBase::Environment::get().getWorld()->getStore().get<ESM::MagicEffect>().find (
-                        effectIt->mEffectID);
-
-                    //const MWMechanics::CreatureStats& stats = actor.getClass().getCreatureStats(actor);
-
-                    float resisted = 0;
-                    if (magicEffect->mData.mFlags & ESM::MagicEffect::Harmful)
-                    {
-
-                    }
-                    params[i].mMultiplier = (100.f - resisted) / 100.f;
-
+                    params[i].mMultiplier = MWMechanics::getEffectMultiplier(effectIt->mEffectID, actor, actor);
                     ++i;
                 }
 
-
                 // Note that using the RefID as a key here is not entirely correct.
                 // Consider equipping the same item twice (e.g. a ring)
                 // However, permanent enchantments with a random magnitude are kind of an exploit anyway,
                 // so it doesn't really matter if both items will get the same magnitude. *Extreme* edge case.
                 mPermanentMagicEffectMagnitudes[(**iter).getCellRef().mRefID] = params;
             }
+            else
+                params = mPermanentMagicEffectMagnitudes[(**iter).getCellRef().mRefID];
 
             int i=0;
             for (std::vector<ESM::ENAMstruct>::const_iterator effectIt (enchantment.mEffects.mList.begin());
-                effectIt!=enchantment.mEffects.mList.end(); ++effectIt)
+                effectIt!=enchantment.mEffects.mList.end(); ++effectIt, ++i)
             {
                 const ESM::MagicEffect *magicEffect =
                     MWBase::Environment::get().getWorld()->getStore().get<ESM::MagicEffect>().find (
@@ -355,7 +347,6 @@ void MWWorld::InventoryStore::updateMagicEffects(const Ptr& actor)
                 magnitude *= params[i].mMultiplier;
                 if (magnitude)
                     mMagicEffects.add (*effectIt, magnitude);
-                ++i;
             }
         }
     }
@@ -554,8 +545,9 @@ void MWWorld::InventoryStore::visitEffectSources(MWMechanics::EffectSourceVisito
         for (std::vector<ESM::ENAMstruct>::const_iterator effectIt (enchantment.mEffects.mList.begin());
             effectIt!=enchantment.mEffects.mList.end(); ++effectIt)
         {
-            float random = mPermanentMagicEffectMagnitudes[(**iter).getCellRef().mRefID][i].mRandom;
-            float magnitude = effectIt->mMagnMin + (effectIt->mMagnMax - effectIt->mMagnMin) * random;
+            const EffectParams& params = mPermanentMagicEffectMagnitudes[(**iter).getCellRef().mRefID][i];
+            float magnitude = effectIt->mMagnMin + (effectIt->mMagnMax - effectIt->mMagnMin) * params.mRandom;
+            magnitude *= params.mMultiplier;
             visitor.visit(*effectIt, (**iter).getClass().getName(**iter), magnitude);
 
             ++i;

apps/openmw/mwworld/worldimp.cpp

@@ -26,7 +26,7 @@
 #include "../mwmechanics/creaturestats.hpp"
 #include "../mwmechanics/movement.hpp"
 #include "../mwmechanics/npcstats.hpp"
-#include "../mwmechanics/spellsuccess.hpp"
+#include "../mwmechanics/spellcasting.hpp"
 
 
 #include "../mwrender/sky.hpp"
@@ -2158,7 +2158,7 @@ namespace MWWorld
         // Now apply the spell!
 
         // Apply Self portion
-        actor.getClass().getCreatureStats(actor).getActiveSpells().addSpell(selectedSpell, actor, ESM::RT_Self, sourceName);
+        actor.getClass().getCreatureStats(actor).getActiveSpells().addSpell(selectedSpell, actor, actor, ESM::RT_Self, sourceName);
 
         // Apply Touch portion
         // TODO: Distance is probably incorrect, and should it be hardcoded?
@@ -2166,7 +2166,7 @@ namespace MWWorld
         if (!contact.first.isEmpty())
         {
             if (contact.first.getClass().isActor())
-                contact.first.getClass().getCreatureStats(contact.first).getActiveSpells().addSpell(selectedSpell, contact.first, ESM::RT_Touch, sourceName);
+                contact.first.getClass().getCreatureStats(contact.first).getActiveSpells().addSpell(selectedSpell, contact.first, actor, ESM::RT_Touch, sourceName);
             else
             {
                 // We hit a non-actor, e.g. a door. Only instant effects are relevant.