From e0e4cbbb4127eb2a0a694bcb8cf5d0329f31fe56 Mon Sep 17 00:00:00 2001
From: scrawl <scrawl@baseoftrash.de>
Date: Sun, 24 Aug 2014 01:50:29 +0200
Subject: [PATCH] Implement Light magic effect (Fixes #1122)

---
 apps/openmw/mwmechanics/character.cpp |  3 +++
 apps/openmw/mwrender/animation.cpp    | 34 +++++++++++++++++++++++++++
 apps/openmw/mwrender/animation.hpp    |  7 ++++++
 3 files changed, 44 insertions(+)

diff --git a/apps/openmw/mwmechanics/character.cpp b/apps/openmw/mwmechanics/character.cpp
index 641bd3f6b..0362b8e23 100644
--- a/apps/openmw/mwmechanics/character.cpp
+++ b/apps/openmw/mwmechanics/character.cpp
@@ -1663,6 +1663,9 @@ void CharacterController::updateVisibility()
     }
 
     mAnimation->setAlpha(alpha);
+
+    float light = mPtr.getClass().getCreatureStats(mPtr).getMagicEffects().get(ESM::MagicEffect::Light).getMagnitude();
+    mAnimation->setLightEffect(light);
 }
 
 void CharacterController::determineAttackType()
diff --git a/apps/openmw/mwrender/animation.cpp b/apps/openmw/mwrender/animation.cpp
index e179d7a1d..ab181ca77 100644
--- a/apps/openmw/mwrender/animation.cpp
+++ b/apps/openmw/mwrender/animation.cpp
@@ -71,6 +71,7 @@ Animation::Animation(const MWWorld::Ptr &ptr, Ogre::SceneNode *node)
     , mNonAccumCtrl(NULL)
     , mAccumulate(0.0f)
     , mNullAnimationTimePtr(OGRE_NEW NullAnimationTime)
+    , mGlowLight(NULL)
 {
     for(size_t i = 0;i < sNumGroups;i++)
         mAnimationTimePtr[i].bind(OGRE_NEW AnimationTime(this));
@@ -78,6 +79,8 @@ Animation::Animation(const MWWorld::Ptr &ptr, Ogre::SceneNode *node)
 
 Animation::~Animation()
 {
+    setLightEffect(0);
+
     mEffects.clear();
 
     mAnimSources.clear();
@@ -1397,6 +1400,37 @@ Ogre::Vector3 Animation::getEnchantmentColor(MWWorld::Ptr item)
     return result;
 }
 
+void Animation::setLightEffect(float effect)
+{
+    if (effect == 0)
+    {
+        if (mGlowLight)
+        {
+            mInsert->getCreator()->destroySceneNode(mGlowLight->getParentSceneNode());
+            mInsert->getCreator()->destroyLight(mGlowLight);
+            mGlowLight = NULL;
+        }
+    }
+    else
+    {
+        if (!mGlowLight)
+        {
+            mGlowLight = mInsert->getCreator()->createLight();
+
+            Ogre::AxisAlignedBox bounds = Ogre::AxisAlignedBox::BOX_NULL;
+            for(size_t i = 0;i < mObjectRoot->mEntities.size();i++)
+            {
+                Ogre::Entity *ent = mObjectRoot->mEntities[i];
+                bounds.merge(ent->getBoundingBox());
+            }
+            mInsert->createChildSceneNode(bounds.getCenter())->attachObject(mGlowLight);
+        }
+        mGlowLight->setType(Ogre::Light::LT_POINT);
+        effect += 3;
+        mGlowLight->setAttenuation(1.0f / (0.03 * (0.5/effect)), 0, 0.5/effect, 0);
+    }
+}
+
 
 ObjectAnimation::ObjectAnimation(const MWWorld::Ptr& ptr, const std::string &model)
   : Animation(ptr, ptr.getRefData().getBaseNode())
diff --git a/apps/openmw/mwrender/animation.hpp b/apps/openmw/mwrender/animation.hpp
index dc4244c39..b85e74549 100644
--- a/apps/openmw/mwrender/animation.hpp
+++ b/apps/openmw/mwrender/animation.hpp
@@ -126,6 +126,8 @@ protected:
 
     MWWorld::Ptr mPtr;
 
+    Ogre::Light* mGlowLight;
+
     Ogre::SceneNode *mInsert;
     Ogre::Entity *mSkelBase;
     NifOgre::ObjectScenePtr mObjectRoot;
@@ -301,6 +303,11 @@ public:
     /// This is typically called as part of runAnimation, but may be called manually if needed.
     void updateEffects(float duration);
 
+    // TODO: move outside of this class
+    /// Makes this object glow, by placing a Light in its center.
+    /// @param effect Controls the radius and intensity of the light.
+    void setLightEffect(float effect);
+
     virtual void showWeapons(bool showWeapon);
     virtual void showCarriedLeft(bool show) {}
     virtual void attachArrow() {}