More efficient water walking

apps/openmw/mwbase/world.hpp

@@ -541,6 +541,8 @@ namespace MWBase
 
             /// Resets all actors in the current active cells to their original location within that cell.
             virtual void resetActors() = 0;
+
+            virtual bool isWalkingOnWater (const MWWorld::Ptr& actor) = 0;
     };
 }
 

apps/openmw/mwrender/renderingmanager.cpp

@@ -250,7 +250,6 @@ void RenderingManager::cellAdded (MWWorld::CellStore *store)
     mObjects->buildStaticGeometry (*store);
     sh::Factory::getInstance().unloadUnreferencedMaterials();
     mDebugging->cellAdded(store);
-    waterAdded(store);
 }
 
 void RenderingManager::addObject (const MWWorld::Ptr& ptr){
@@ -421,18 +420,12 @@ void RenderingManager::postRenderTargetUpdate(const RenderTargetEvent &evt)
     mOcclusionQuery->setActive(false);
 }
 
-void RenderingManager::waterAdded (MWWorld::CellStore *store)
+void RenderingManager::setWaterEnabled(bool enable)
 {
-    if (store->getCell()->mData.mFlags & ESM::Cell::HasWater)
-    {
-        mWater->changeCell (store->getCell());
-        mWater->setActive(true);
-    }
-    else
-        removeWater();
+    mWater->setActive(enable);
 }
 
-void RenderingManager::setWaterHeight(const float height)
+void RenderingManager::setWaterHeight(float height)
 {
     mWater->setHeight(height);
 }

apps/openmw/mwrender/renderingmanager.hpp

@@ -100,7 +100,6 @@ public:
     /// \todo this function should be removed later. Instead the rendering subsystems should track
     /// when rebatching is needed and update automatically at the end of each frame.
     void cellAdded (MWWorld::CellStore *store);
-    void waterAdded(MWWorld::CellStore *store);
 
     /// Clear all savegame-specific data (i.e. fog of war textures)
     void clear();
@@ -121,7 +120,8 @@ public:
     /// Updates an object's rotation
     void rotateObject (const MWWorld::Ptr& ptr);
 
-    void setWaterHeight(const float height);
+    void setWaterHeight(float height);
+    void setWaterEnabled(bool enabled);
     bool toggleWater();
     bool toggleWorld();
 

apps/openmw/mwworld/physicssystem.cpp

@@ -278,8 +278,10 @@ namespace MWWorld
             if (!ptr.getClass().canWalk(ptr) && !ptr.getClass().canFly(ptr) && !ptr.getClass().canSwim(ptr))
                 return position;
 
-            /* Anything to collide with? */
             OEngine::Physic::PhysicActor *physicActor = engine->getCharacter(ptr.getRefData().getHandle());
+            // Reset per-frame data
+            physicActor->setWalkingOnWater(false);
+            /* Anything to collide with? */
             if(!physicActor || !physicActor->getCollisionMode())
             {
                 return position +  (Ogre::Quaternion(Ogre::Radian(refpos.rot[2]), Ogre::Vector3::NEGATIVE_UNIT_Z) *
@@ -457,6 +459,8 @@ namespace MWWorld
                     {
                         standingCollisionTracker[ptr.getRefData().getHandle()] = body->mName;
                     }
+                    if (standingOn->getBroadphaseHandle()->m_collisionFilterGroup == OEngine::Physic::CollisionType_Water)
+                        physicActor->setWalkingOnWater(true);
 
                     newPosition.z = tracer.mEndPos.z + 1.0f;
 
@@ -485,7 +489,7 @@ namespace MWWorld
 
 
     PhysicsSystem::PhysicsSystem(OEngine::Render::OgreRenderer &_rend) :
-        mRender(_rend), mEngine(0), mTimeAccum(0.0f)
+        mRender(_rend), mEngine(0), mTimeAccum(0.0f), mWaterEnabled(false), mWaterHeight(0)
     {
         // Create physics. shapeLoader is deleted by the physic engine
         NifBullet::ManualBulletShapeLoader* shapeLoader = new NifBullet::ManualBulletShapeLoader();
@@ -494,6 +498,8 @@ namespace MWWorld
 
     PhysicsSystem::~PhysicsSystem()
     {
+        if (mWaterCollisionObject.get())
+            mEngine->mDynamicsWorld->removeCollisionObject(mWaterCollisionObject.get());
         delete mEngine;
     }
 
@@ -855,14 +861,8 @@ namespace MWWorld
                                                Ogre::Vector3(iter->first.getRefData().getPosition().pos)))
                     waterCollision = true;
 
-                btStaticPlaneShape planeShape(btVector3(0,0,1), waterlevel);
-                btCollisionObject object;
-                object.setCollisionShape(&planeShape);
-
-                // TODO: this seems to have a slight performance impact
-                if (waterCollision)
-                    mEngine->mDynamicsWorld->addCollisionObject(&object,
-                                                                0xff, OEngine::Physic::CollisionType_Actor);
+                OEngine::Physic::PhysicActor *physicActor = mEngine->getCharacter(iter->first.getRefData().getHandle());
+                physicActor->setCanWaterWalk(waterCollision);
 
                 // 100 points of slowfall reduce gravity by 90% (this is just a guess)
                 float slowFall = 1-std::min(std::max(0.f, (effects.get(ESM::MagicEffect::SlowFall).getMagnitude() / 100.f) * 0.9f), 0.9f);
@@ -871,9 +871,6 @@ namespace MWWorld
                                                             world->isFlying(iter->first),
                                                             waterlevel, slowFall, mEngine, mCollisions, mStandingCollisions);
 
-                if (waterCollision)
-                    mEngine->mDynamicsWorld->removeCollisionObject(&object);
-
                 float heightDiff = newpos.z - oldHeight;
 
                 if (heightDiff < 0)
@@ -949,4 +946,48 @@ namespace MWWorld
         }
     }
 
+    void PhysicsSystem::disableWater()
+    {
+        if (mWaterEnabled)
+        {
+            mWaterEnabled = false;
+            updateWater();
+        }
+    }
+
+    void PhysicsSystem::enableWater(float height)
+    {
+        if (!mWaterEnabled || mWaterHeight != height)
+        {
+            mWaterEnabled = true;
+            mWaterHeight = height;
+            updateWater();
+        }
+    }
+
+    void PhysicsSystem::setWaterHeight(float height)
+    {
+        if (mWaterHeight != height)
+        {
+            mWaterHeight = height;
+            updateWater();
+        }
+    }
+
+    void PhysicsSystem::updateWater()
+    {
+        if (mWaterCollisionObject.get())
+        {
+            mEngine->mDynamicsWorld->removeCollisionObject(mWaterCollisionObject.get());
+        }
+
+        if (!mWaterEnabled)
+            return;
+
+        mWaterCollisionObject.reset(new btCollisionObject());
+        mWaterCollisionShape.reset(new btStaticPlaneShape(btVector3(0,0,1), mWaterHeight));
+        mWaterCollisionObject->setCollisionShape(mWaterCollisionShape.get());
+        mEngine->mDynamicsWorld->addCollisionObject(mWaterCollisionObject.get(), OEngine::Physic::CollisionType_Water,
+                                                    OEngine::Physic::CollisionType_Actor);
+    }
 }

apps/openmw/mwworld/physicssystem.hpp

@@ -1,6 +1,8 @@
 #ifndef GAME_MWWORLD_PHYSICSSYSTEM_H
 #define GAME_MWWORLD_PHYSICSSYSTEM_H
 
+#include <memory>
+
 #include <OgreVector3.h>
 
 #include <btBulletCollisionCommon.h>
@@ -32,6 +34,10 @@ namespace MWWorld
             PhysicsSystem (OEngine::Render::OgreRenderer &_rend);
             ~PhysicsSystem ();
 
+            void enableWater(float height);
+            void setWaterHeight(float height);
+            void disableWater();
+
             void addObject (const MWWorld::Ptr& ptr, bool placeable=false);
 
             void addActor (const MWWorld::Ptr& ptr);
@@ -108,6 +114,8 @@ namespace MWWorld
 
         private:
 
+            void updateWater();
+
             OEngine::Render::OgreRenderer &mRender;
             OEngine::Physic::PhysicEngine* mEngine;
             std::map<std::string, std::string> handleToMesh;
@@ -124,6 +132,12 @@ namespace MWWorld
 
             float mTimeAccum;
 
+            float mWaterHeight;
+            float mWaterEnabled;
+
+            std::auto_ptr<btCollisionObject> mWaterCollisionObject;
+            std::auto_ptr<btCollisionShape> mWaterCollisionShape;
+
             PhysicsSystem (const PhysicsSystem&);
             PhysicsSystem& operator= (const PhysicsSystem&);
     };

apps/openmw/mwworld/scene.cpp

@@ -238,6 +238,15 @@ namespace MWWorld
             insertCell (*cell, true, loadingListener);
 
             mRendering.cellAdded (cell);
+            bool waterEnabled = cell->getCell()->hasWater();
+            mRendering.setWaterEnabled(waterEnabled);
+            if (waterEnabled)
+            {
+                mPhysics->enableWater(cell->getWaterLevel());
+                mRendering.setWaterHeight(cell->getWaterLevel());
+            }
+            else
+                mPhysics->disableWater();
 
             mRendering.configureAmbient(*cell);
         }

apps/openmw/mwworld/worldimp.cpp

@@ -1660,6 +1660,7 @@ namespace MWWorld
 
     void World::setWaterHeight(const float height)
     {
+        mPhysics->setWaterHeight(height);
         mRendering->setWaterHeight(height);
     }
 
@@ -3071,4 +3072,12 @@ namespace MWWorld
             cellstore->forEach(functor);
         }
     }
+
+    bool World::isWalkingOnWater(const Ptr &actor)
+    {
+        OEngine::Physic::PhysicActor* physicActor = mPhysEngine->getCharacter(actor.getRefData().getHandle());
+        if (physicActor && physicActor->isWalkingOnWater())
+            return true;
+        return false;
+    }
 }

apps/openmw/mwworld/worldimp.hpp

@@ -615,6 +615,8 @@ namespace MWWorld
 
             /// Resets all actors in the current active cells to their original location within that cell.
             virtual void resetActors();
+
+            virtual bool isWalkingOnWater (const MWWorld::Ptr& actor);
     };
 }
 

libs/openengine/bullet/physic.cpp

@@ -74,6 +74,8 @@ namespace Physic
       , mExternalCollisionMode(true)
       , mForce(0.0f)
       , mScale(scale)
+      , mWalkingOnWater(false)
+      , mCanWaterWalk(false)
     {
         if (!NifBullet::getBoundingBox(mMesh, mHalfExtents, mMeshTranslation, mMeshOrientation))
         {
@@ -103,8 +105,7 @@ namespace Physic
         setPosition(position);
         setRotation(rotation);
 
-        mEngine->mDynamicsWorld->addRigidBody(mBody, CollisionType_Actor,
-            CollisionType_Actor|CollisionType_World|CollisionType_HeightMap|CollisionType_Projectile);
+        updateCollisionMask();
     }
 
     PhysicActor::~PhysicActor()
@@ -123,10 +124,22 @@ namespace Physic
 
     void PhysicActor::enableCollisionBody(bool collision)
     {
-        assert(mBody);
-        if(collision && !mExternalCollisionMode) enableCollisionBody();
-        if(!collision && mExternalCollisionMode) disableCollisionBody();
-        mExternalCollisionMode = collision;
+        if (mExternalCollisionMode != collision)
+        {
+            mExternalCollisionMode = collision;
+            updateCollisionMask();
+        }
+    }
+
+    void PhysicActor::updateCollisionMask()
+    {
+        mEngine->mDynamicsWorld->removeRigidBody(mBody);
+        int collisionMask = CollisionType_World | CollisionType_HeightMap;
+        if (mExternalCollisionMode)
+            collisionMask |= CollisionType_Actor | CollisionType_Projectile;
+        if (mCanWaterWalk)
+            collisionMask |= CollisionType_Water;
+        mEngine->mDynamicsWorld->addRigidBody(mBody, CollisionType_Actor, collisionMask);
     }
 
     const Ogre::Vector3& PhysicActor::getPosition() const
@@ -178,18 +191,23 @@ namespace Physic
         mOnGround = grounded;
     }
 
-    void PhysicActor::disableCollisionBody()
+    bool PhysicActor::isWalkingOnWater() const
     {
-        mEngine->mDynamicsWorld->removeRigidBody(mBody);
-        mEngine->mDynamicsWorld->addRigidBody(mBody, CollisionType_Actor,
-            CollisionType_World|CollisionType_HeightMap);
+        return mWalkingOnWater;
     }
 
-    void PhysicActor::enableCollisionBody()
+    void PhysicActor::setWalkingOnWater(bool walkingOnWater)
     {
-        mEngine->mDynamicsWorld->removeRigidBody(mBody);
-        mEngine->mDynamicsWorld->addRigidBody(mBody, CollisionType_Actor,
-            CollisionType_Actor|CollisionType_World|CollisionType_HeightMap|CollisionType_Projectile);
+        mWalkingOnWater = walkingOnWater;
+    }
+
+    void PhysicActor::setCanWaterWalk(bool waterWalk)
+    {
+        if (waterWalk != mCanWaterWalk)
+        {
+            mCanWaterWalk = waterWalk;
+            updateCollisionMask();
+        }
     }
 
     ////////////////////////////////////////////////////////////////////////////////////////////////////////////////

libs/openengine/bullet/physic.hpp

@@ -47,7 +47,8 @@ namespace Physic
         CollisionType_Actor = 1<<1, //<Collide sith actors
         CollisionType_HeightMap = 1<<2, //<collide with heightmap
         CollisionType_Raycasting = 1<<3,
-        CollisionType_Projectile = 1<<4
+        CollisionType_Projectile = 1<<4,
+        CollisionType_Water = 1<<5
     };
 
     /**
@@ -131,9 +132,20 @@ namespace Physic
             return mBody;
         }
 
+
+        /// Sets whether this actor should be able to collide with the water surface
+        void setCanWaterWalk(bool waterWalk);
+
+        /// Sets whether this actor has been walking on the water surface in the last frame
+        void setWalkingOnWater(bool walkingOnWater);
+        bool isWalkingOnWater() const;
+
     private:
-        void disableCollisionBody();
-        void enableCollisionBody();
+        /// Removes then re-adds the collision body to the dynamics world
+        void updateCollisionMask();
+
+        bool mCanWaterWalk;
+        bool mWalkingOnWater;
 
         boost::shared_ptr<btCollisionShape> mShape;