Allow to enchant multiple projectiles at once (feature #3517)

CHANGELOG.md

@@ -189,6 +189,7 @@
     Feature #2229: Improve pathfinding AI
     Feature #3025: Analogue gamepad movement controls
     Feature #3442: Default values for fallbacks from ini file
+    Feature #3517: Multiple projectiles enchantment
     Feature #3610: Option to invert X axis
     Feature #3871: Editor: Terrain Selection
     Feature #3893: Implicit target for "set" function in console

apps/openmw/mwmechanics/enchanting.cpp

@@ -1,6 +1,7 @@
 #include "enchanting.hpp"
 
 #include <components/misc/rng.hpp>
+#include <components/settings/settings.hpp>
 
 #include "../mwworld/manualref.hpp"
 #include "../mwworld/class.hpp"
@@ -62,7 +63,6 @@ namespace MWMechanics
         const MWWorld::Ptr& player = getPlayer();
         MWWorld::ContainerStore& store = player.getClass().getContainerStore(player);
         ESM::Enchantment enchantment;
-        enchantment.mData.mCharge = getGemCharge();
         enchantment.mData.mAutocalc = 0;
         enchantment.mData.mType = mCastStyle;
         enchantment.mData.mCost = getBaseCastCost();
@@ -81,19 +81,26 @@ namespace MWMechanics
             mEnchanter.getClass().skillUsageSucceeded (mEnchanter, ESM::Skill::Enchant, 2);
         }
 
-        if(mCastStyle==ESM::Enchantment::ConstantEffect)
-        {
-            enchantment.mData.mCharge=0;
-        }
         enchantment.mEffects = mEffectList;
 
+        int count = getEnchantItemsCount();
+
+        if(mCastStyle==ESM::Enchantment::ConstantEffect)
+            enchantment.mData.mCharge = 0;
+        else
+            enchantment.mData.mCharge = getGemCharge() / count;
+
+        // Try to find a dynamic enchantment with the same stats, create a new one if not found.
+        const ESM::Enchantment* enchantmentPtr = getRecord(enchantment);
+        if (enchantmentPtr == nullptr)
+            enchantmentPtr = MWBase::Environment::get().getWorld()->createRecord (enchantment);
+
         // Apply the enchantment
-        const ESM::Enchantment *enchantmentPtr = MWBase::Environment::get().getWorld()->createRecord (enchantment);
         std::string newItemId = mOldItemPtr.getClass().applyEnchantment(mOldItemPtr, enchantmentPtr->mId, getGemCharge(), mNewItemName);
 
         // Add the new item to player inventory and remove the old one
-        store.remove(mOldItemPtr, 1, player);
-        store.add(newItemId, 1, player);
+        store.remove(mOldItemPtr, count, player);
+        store.add(newItemId, count, player);
 
         if(!mSelfEnchanting)
             payForEnchantment();
@@ -123,20 +130,22 @@ namespace MWMechanics
         }
         else if (mWeaponType != -1)
         { // Weapon
+            ESM::WeaponType::Class weapclass = MWMechanics::getWeaponType(mWeaponType)->mWeaponClass;
             switch(mCastStyle)
             {
                 case ESM::Enchantment::WhenStrikes:
-                    mCastStyle = ESM::Enchantment::WhenUsed;
+                    if (weapclass == ESM::WeaponType::Melee || weapclass == ESM::WeaponType::Ranged)
+                        mCastStyle = ESM::Enchantment::WhenUsed;
                     return;
                 case ESM::Enchantment::WhenUsed:
-                    if (powerfulSoul)
+                    if (powerfulSoul && weapclass != ESM::WeaponType::Ammo && weapclass != ESM::WeaponType::Thrown)
                         mCastStyle = ESM::Enchantment::ConstantEffect;
-                    else if (getWeaponType(mWeaponType)->mWeaponClass != ESM::WeaponType::Ranged)
+                    else if (weapclass != ESM::WeaponType::Ranged)
                         mCastStyle = ESM::Enchantment::WhenStrikes;
                     return;
                 default: // takes care of Constant effect too
                     mCastStyle = ESM::Enchantment::WhenUsed;
-                    if (getWeaponType(mWeaponType)->mWeaponClass != ESM::WeaponType::Ranged)
+                    if (weapclass != ESM::WeaponType::Ranged)
                         mCastStyle = ESM::Enchantment::WhenStrikes;
                     return;
             }
@@ -200,6 +209,53 @@ namespace MWMechanics
         return enchantmentCost;
     }
 
+    const ESM::Enchantment* Enchanting::getRecord(const ESM::Enchantment& toFind) const
+    {
+        const MWWorld::Store<ESM::Enchantment>& enchantments = MWBase::Environment::get().getWorld()->getStore().get<ESM::Enchantment>();
+        MWWorld::Store<ESM::Enchantment>::iterator iter (enchantments.begin());
+        iter += (enchantments.getSize() - enchantments.getDynamicSize());
+        for (; iter != enchantments.end(); ++iter)
+        {
+            if (iter->mEffects.mList.size() != toFind.mEffects.mList.size())
+                continue;
+
+            if (iter->mData.mAutocalc != toFind.mData.mAutocalc
+                    || iter->mData.mType != toFind.mData.mType
+                    || iter->mData.mCost != toFind.mData.mCost
+                    || iter->mData.mCharge != toFind.mData.mCharge)
+                continue;
+
+            // Don't choose an ID that came from the content files, would have unintended side effects
+            if (!enchantments.isDynamic(iter->mId))
+                continue;
+
+            bool mismatch = false;
+
+            for (int i=0; i<static_cast<int> (iter->mEffects.mList.size()); ++i)
+            {
+                const ESM::ENAMstruct& first = iter->mEffects.mList[i];
+                const ESM::ENAMstruct& second = toFind.mEffects.mList[i];
+
+                if (first.mEffectID!=second.mEffectID ||
+                    first.mArea!=second.mArea ||
+                    first.mRange!=second.mRange ||
+                    first.mSkill!=second.mSkill ||
+                    first.mAttribute!=second.mAttribute ||
+                    first.mMagnMin!=second.mMagnMin ||
+                    first.mMagnMax!=second.mMagnMax ||
+                    first.mDuration!=second.mDuration)
+                {
+                    mismatch = true;
+                    break;
+                }
+            }
+
+            if (!mismatch)
+                return &(*iter);
+        }
+
+        return nullptr;
+    }
 
     int Enchanting::getBaseCastCost() const
     {
@@ -224,6 +280,7 @@ namespace MWMechanics
 
         float priceMultipler = MWBase::Environment::get().getWorld()->getStore().get<ESM::GameSetting>().find ("fEnchantmentValueMult")->mValue.getFloat();
         int price = MWBase::Environment::get().getMechanicsManager()->getBarterOffer(mEnchanter, static_cast<int>(getEnchantPoints() * priceMultipler), true);
+        price *= getEnchantItemsCount() * getTypeMultiplier();
         return price;
     }
 
@@ -282,13 +339,45 @@ namespace MWMechanics
         const float fEnchantmentChanceMult = gmst.find("fEnchantmentChanceMult")->mValue.getFloat();
         const float fEnchantmentConstantChanceMult = gmst.find("fEnchantmentConstantChanceMult")->mValue.getFloat();
 
-        float x = (a - getEnchantPoints()*fEnchantmentChanceMult + 0.2f * b + 0.1f * c) * stats.getFatigueTerm();
+        float x = (a - getEnchantPoints() * fEnchantmentChanceMult * getTypeMultiplier() * getEnchantItemsCount() + 0.2f * b + 0.1f * c) * stats.getFatigueTerm();
         if (mCastStyle == ESM::Enchantment::ConstantEffect)
             x *= fEnchantmentConstantChanceMult;
 
         return static_cast<int>(x);
     }
 
+    int Enchanting::getEnchantItemsCount() const
+    {
+        int count = 1;
+        float enchantPoints = getEnchantPoints();
+        if (mWeaponType != -1 && enchantPoints > 0)
+        {
+            ESM::WeaponType::Class weapclass = MWMechanics::getWeaponType(mWeaponType)->mWeaponClass;
+            if (weapclass == ESM::WeaponType::Thrown || weapclass == ESM::WeaponType::Ammo)
+            {
+                static const float multiplier = std::max(0.f, std::min(1.0f, Settings::Manager::getFloat("projectiles enchant multiplier", "Game")));
+                MWWorld::Ptr player = getPlayer();
+                int itemsInInventoryCount = player.getClass().getContainerStore(player).count(mOldItemPtr.getCellRef().getRefId());
+                count = std::min(itemsInInventoryCount, std::max(1, int(getGemCharge() * multiplier / enchantPoints)));
+            }
+        }
+
+        return count;
+    }
+
+    float Enchanting::getTypeMultiplier() const
+    {
+        static const bool useMultiplier = Settings::Manager::getFloat("projectiles enchant multiplier", "Game") > 0;
+        if (useMultiplier && mWeaponType != -1 && getEnchantPoints() > 0)
+        {
+            ESM::WeaponType::Class weapclass = MWMechanics::getWeaponType(mWeaponType)->mWeaponClass;
+            if (weapclass == ESM::WeaponType::Thrown || weapclass == ESM::WeaponType::Ammo)
+                return 0.125f;
+        }
+
+        return 1.f;
+    }
+
     void Enchanting::payForEnchantment() const
     {
         const MWWorld::Ptr& player = getPlayer();

apps/openmw/mwmechanics/enchanting.hpp

@@ -4,6 +4,7 @@
 #include <string>
 
 #include <components/esm/effectlist.hpp>
+#include <components/esm/loadench.hpp>
 
 #include "../mwworld/ptr.hpp"
 
@@ -25,6 +26,8 @@ namespace MWMechanics
             std::string mObjectType;
             int mWeaponType;
 
+            const ESM::Enchantment* getRecord(const ESM::Enchantment& newEnchantment) const;
+
         public:
             Enchanting();
             void setEnchanter(const MWWorld::Ptr& enchanter);
@@ -45,6 +48,8 @@ namespace MWMechanics
             int getMaxEnchantValue() const;
             int getGemCharge() const;
             int getEnchantChance() const;
+            int getEnchantItemsCount() const;
+            float getTypeMultiplier() const;
             bool soulEmpty() const; //Return true if empty
             bool itemEmpty() const; //Return true if empty
             void payForEnchantment() const;

apps/openmw/mwworld/store.hpp

@@ -106,6 +106,11 @@ namespace MWWorld
             return iter;
         }
 
+        SharedIterator &operator+=(int advance) {
+            mIter += advance;
+            return *this;
+        }
+
         SharedIterator &operator--() {
             --mIter;
             return *this;

docs/source/reference/modding/settings/game.rst

@@ -282,3 +282,19 @@ equivalent to the one introduced by the equivalent Morrowind Code Patch feature.
 This makes the movement speed behavior more fair between different races.
 
 This setting can be controlled in Advanced tab of the launcher.
+
+projectiles enchant multiplier
+------------------------------
+
+:Type:		floating point
+:Range:		0.0 to 1.0
+:Default:	0.0
+
+The value of this setting determines how many projectiles (thrown weapons, arrows and bolts) you can enchant at once according to the following formula:
+
+count = (soul gem charge * projectiles enchant multiplier) / enchantment strength
+
+A value of 0 means that you can only enchant one projectile.
+If you want to have Morrowind Code Patch-like count of projectiles being enchanted at once, set this value to 0.25 (i.e. 25% of the charge).
+
+This setting can only be configured by editing the settings configuration file.

files/settings-default.cfg

@@ -267,6 +267,11 @@ use magic item animations = false
 # Don't use race weight in NPC movement speed calculations
 normalise race speed = false
 
+# Adjusts the number of projectiles you can enchant at once:
+# count = (soul gem charge * projectiles enchant multiplier) / enchantment strength
+# A value of 0 means that you can only enchant one projectile.
+projectiles enchant multiplier = 0
+
 [General]
 
 # Anisotropy reduces distortion in textures at low angles (e.g. 0 to 16).