text: /*
  -----------------------------------------------------------------------------
  This source file is part of OGRE
  (Object-oriented Graphics Rendering Engine)
  For the latest info, see http://www.ogre3d.org
  
  Copyright (c) 2000-2014 Torus Knot Software Ltd
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  THE SOFTWARE.
  -----------------------------------------------------------------------------
  */
  #ifndef __Entity_H__
  #define __Entity_H__
  
  #include "OgrePrerequisites.h"
  #include "OgreCommon.h"
  
  #include "OgreMovableObject.h"
  #include "OgreQuaternion.h"
  #include "OgreVector3.h"
  #include "OgreHardwareBufferManager.h"
  #include "OgreRenderable.h"
  #include "OgreResourceGroupManager.h"
  #include "OgreHeaderPrefix.h"
  
  namespace Ogre {
      /** \addtogroup Core
      *  @{
      */
      /** \addtogroup Scene
      *  @{
      */
      /** Defines an instance of a discrete, movable object based on a Mesh.
      @remarks
          Ogre generally divides renderable objects into 2 groups, discrete
          (separate) and relatively small objects which move around the world,
          and large, sprawling geometry which makes up generally immovable
          scenery, aka 'level geometry'.
      @par
          The Mesh and SubMesh classes deal with the definition of the geometry
          used by discrete movable objects. Entities are actual instances of
          objects based on this geometry in the world. Therefore there is
          usually a single set Mesh for a car, but there may be multiple
          entities based on it in the world. Entities are able to override
          aspects of the Mesh it is defined by, such as changing material
          properties per instance (so you can have many cars using the same
          geometry but different textures for example). Because a Mesh is split
          into SubMeshes for this purpose, the Entity class is a grouping class
          (much like the Mesh class) and much of the detail regarding
          individual changes is kept in the SubEntity class. There is a 1:1
          relationship between SubEntity instances and the SubMesh instances
          associated with the Mesh the Entity is based on.
      @par
          Entity and SubEntity classes are never created directly. Use the
          createEntity method of the SceneManager (passing a model name) to
          create one.
      @par
          Entities are included in the scene by associating them with a
          SceneNode, using the attachEntity method. See the SceneNode class
          for full information.
      @note
          No functions were declared virtual to improve performance.
      */
      class _OgreExport Entity: public MovableObject, public Resource::Listener
      {
          // Allow EntityFactory full access
          friend class EntityFactory;
          friend class SubEntity;
      public:
          
          typedef set<Entity*>::type EntitySet;
          typedef map<unsigned short, bool>::type SchemeHardwareAnimMap;
          typedef vector<SubEntity*>::type SubEntityList;
      protected:
  
          /** Private constructor (instances cannot be created directly).
          */
          Entity();
          /** Private constructor - specify name (the usual constructor used).
          */
          Entity( const String& name, const MeshPtr& mesh);
  
          /** The Mesh that this Entity is based on.
          */
          MeshPtr mMesh;
  
          /** List of SubEntities (point to SubMeshes).
          */
          SubEntityList mSubEntityList;
  
  
          /// State of animation for animable meshes
          AnimationStateSet* mAnimationState;
  
  
          /// Temp buffer details for software skeletal anim of shared geometry
          TempBlendedBufferInfo mTempSkelAnimInfo;
          /// Vertex data details for software skeletal anim of shared geometry
          VertexData* mSkelAnimVertexData;
          /// Temp buffer details for software vertex anim of shared geometry
          TempBlendedBufferInfo mTempVertexAnimInfo;
          /// Vertex data details for software vertex anim of shared geometry
          VertexData* mSoftwareVertexAnimVertexData;
          /// Vertex data details for hardware vertex anim of shared geometry
          /// - separate since we need to s/w anim for shadows whilst still altering
          ///   the vertex data for hardware morphing (pos2 binding)
          VertexData* mHardwareVertexAnimVertexData;
          /// Have we applied any vertex animation to shared geometry?
          bool mVertexAnimationAppliedThisFrame;
          /// Have the temp buffers already had their geometry prepared for use in rendering shadow volumes?
          bool mPreparedForShadowVolumes;
  
          /** Internal method - given vertex data which could be from the Mesh or
              any submesh, finds the temporary blend copy.
          */
          const VertexData* findBlendedVertexData(const VertexData* orig);
          /** Internal method - given vertex data which could be from the Mesh or
              any SubMesh, finds the corresponding SubEntity.
          */
          SubEntity* findSubEntityForVertexData(const VertexData* orig);
  
          /** Internal method for extracting metadata out of source vertex data
              for fast assignment of temporary buffers later.
          */
          void extractTempBufferInfo(VertexData* sourceData, TempBlendedBufferInfo* info);
          /** Internal method to clone vertex data definitions but to remove blend buffers. */
          VertexData* cloneVertexDataRemoveBlendInfo(const VertexData* source);
          /** Internal method for preparing this Entity for use in animation. */
          void prepareTempBlendBuffers(void);
          /** Mark all vertex data as so far unanimated.
          */
          void markBuffersUnusedForAnimation(void);
          /** Internal method to restore original vertex data where we didn't
              perform any vertex animation this frame.
          */
          void restoreBuffersForUnusedAnimation(bool hardwareAnimation);
  
          /** Ensure that any unbound  pose animation buffers are bound to a safe
              default.
          @param srcData
              Original vertex data containing original positions.
          @param destData
              Hardware animation vertex data to be checked.
          */
          void bindMissingHardwarePoseBuffers(const VertexData* srcData, 
              VertexData* destData);
              
          /** When performing software pose animation, initialise software copy
              of vertex data.
          */
          void initialisePoseVertexData(const VertexData* srcData, VertexData* destData, 
              bool animateNormals);
  
          /** When animating normals for pose animation, finalise normals by filling in
              with the reference mesh normal where applied normal weights < 1.
          */
          void finalisePoseNormals(const VertexData* srcData, VertexData* destData);
  
          /// Cached bone matrices, including any world transform.
          Matrix4 *mBoneWorldMatrices;
          /// Cached bone matrices in skeleton local space, might shares with other entity instances.
          Matrix4 *mBoneMatrices;
          unsigned short mNumBoneMatrices;
          /// Records the last frame in which animation was updated.
          unsigned long mFrameAnimationLastUpdated;
  
          /// Perform all the updates required for an animated entity.
          void updateAnimation(void);
  
          /// Records the last frame in which the bones was updated.
          /// It's a pointer because it can be shared between different entities with
          /// a shared skeleton.
          unsigned long *mFrameBonesLastUpdated;
  
          /** A set of all the entities which shares a single SkeletonInstance.
              This is only created if the entity is in fact sharing it's SkeletonInstance with
              other Entities.
          */
          EntitySet* mSharedSkeletonEntities;
  
          /** Private method to cache bone matrices from skeleton.
          @return
              True if the bone matrices cache has been updated. False if note.
          */
          bool cacheBoneMatrices(void);
  
          /// Flag determines whether or not to display skeleton.
          bool mDisplaySkeleton;
          /** Flag indicating whether hardware animation is supported by this entities materials
              data is saved per scehme number.
          */
          SchemeHardwareAnimMap mSchemeHardwareAnim;
  
          /// Current state of the hardware animation as represented by the entities parameters.
          bool mCurrentHWAnimationState;
  
          /// Number of hardware poses supported by materials.
          ushort mHardwarePoseCount;
          /// Flag indicating whether we have a vertex program in use on any of our subentities.
          bool mVertexProgramInUse;
          /// Counter indicating number of requests for software animation.
          int mSoftwareAnimationRequests;
          /// Counter indicating number of requests for software blended normals.
          int mSoftwareAnimationNormalsRequests;
          /// Flag indicating whether to skip automatic updating of the Skeleton's AnimationState.
          bool mSkipAnimStateUpdates;
          /// Flag indicating whether to update the main entity skeleton even when an LOD is displayed.
          bool mAlwaysUpdateMainSkeleton;
          /// Flag indicating whether to update the bounding box from the bones of the skeleton.
          bool mUpdateBoundingBoxFromSkeleton;
  
  #if !OGRE_NO_MESHLOD
          /// The LOD number of the mesh to use, calculated by _notifyCurrentCamera.
          ushort mMeshLodIndex;
  
          /// LOD bias factor, transformed for optimisation when calculating adjusted LOD value.
          Real mMeshLodFactorTransformed;
          /// Index of minimum detail LOD (NB higher index is lower detail).
          ushort mMinMeshLodIndex;
          /// Index of maximum detail LOD (NB lower index is higher detail).
          ushort mMaxMeshLodIndex;
  
          /// LOD bias factor, not transformed.
          Real mMaterialLodFactor;
          /// LOD bias factor, transformed for optimisation when calculating adjusted LOD value.
          Real mMaterialLodFactorTransformed;
          /// Index of minimum detail LOD (NB higher index is lower detail).
          ushort mMinMaterialLodIndex;
          /// Index of maximum detail LOD (NB lower index is higher detail).
          ushort mMaxMaterialLodIndex;
  
          /** List of LOD Entity instances (for manual LODs).
              We don't know when the mesh is using manual LODs whether one LOD to the next will have the
              same number of SubMeshes, therefore we have to allow a separate Entity list
              with each alternate one.
          */
          typedef vector<Entity*>::type LODEntityList;
          LODEntityList mLodEntityList;
  #else
          const ushort mMeshLodIndex;
          const Real mMeshLodFactorTransformed;
          const ushort mMinMeshLodIndex;
          const ushort mMaxMeshLodIndex;
          const Real mMaterialLodFactor;
          const Real mMaterialLodFactorTransformed;
          const ushort mMinMaterialLodIndex;
          const ushort mMaxMaterialLodIndex;
  #endif
          /** This Entity's personal copy of the skeleton, if skeletally animated.
          */
          SkeletonInstance* mSkeletonInstance;
  
          /// Has this entity been initialised yet?
          bool mInitialised;
  
          /// Last parent transform.
          Matrix4 mLastParentXform;
  
          /// Mesh state count, used to detect differences.
          size_t mMeshStateCount;
  
          /** Builds a list of SubEntities based on the SubMeshes contained in the Mesh. */
          void buildSubEntityList(MeshPtr& mesh, SubEntityList* sublist);
  
          /// Internal implementation of attaching a 'child' object to this entity and assign the parent node to the child entity.
          void attachObjectImpl(MovableObject *pMovable, TagPoint *pAttachingPoint);
  
          /// Internal implementation of detaching a 'child' object of this entity and clear the parent node of the child entity.
          void detachObjectImpl(MovableObject* pObject);
  
          /// Internal implementation of detaching all 'child' objects of this entity.
          void detachAllObjectsImpl(void);
  
          /// Ensures reevaluation of the vertex processing usage.
          void reevaluateVertexProcessing(void);
  
          /** Calculates the kind of vertex processing in use.
          @remarks
              This function's return value is calculated according to the current 
              active scheme. This is due to the fact that RTSS schemes may be different
              in their handling of hardware animation.
          */
          bool calcVertexProcessing(void);
      
          /// Apply vertex animation.
          void applyVertexAnimation(bool hardwareAnimation, bool stencilShadows);
          /// Initialise the hardware animation elements for given vertex data.
          ushort initHardwareAnimationElements(VertexData* vdata, ushort numberOfElements, bool animateNormals);
          /// Are software vertex animation temp buffers bound?
          bool tempVertexAnimBuffersBound(void) const;
          /// Are software skeleton animation temp buffers bound?
          bool tempSkelAnimBuffersBound(bool requestNormals) const;
  
      public:
          /// Contains the child objects (attached to bones) indexed by name.
          typedef map<String, MovableObject*>::type ChildObjectList;
      protected:
          ChildObjectList mChildObjectList;
  
  
          /// Bounding box that 'contains' all the mesh of each child entity.
          mutable AxisAlignedBox mFullBoundingBox;  // note: this exists only so that getBoundingBox() can return an AAB by reference
  
          ShadowRenderableList mShadowRenderables;
  
          /** Nested class to allow entity shadows. */
          class _OgreExport EntityShadowRenderable : public ShadowRenderable
          {
          protected:
              Entity* mParent;
              /// Shared link to position buffer.
              HardwareVertexBufferSharedPtr mPositionBuffer;
              /// Shared link to w-coord buffer (optional).
              HardwareVertexBufferSharedPtr mWBuffer;
              /// Link to current vertex data used to bind (maybe changes).
              const VertexData* mCurrentVertexData;
              /// Original position buffer source binding.
              unsigned short mOriginalPosBufferBinding;
              /// Link to SubEntity, only present if SubEntity has it's own geometry.
              SubEntity* mSubEntity;
  
  
          public:
              EntityShadowRenderable(Entity* parent,
                  HardwareIndexBufferSharedPtr* indexBuffer, const VertexData* vertexData,
                  bool createSeparateLightCap, SubEntity* subent, bool isLightCap = false);
              ~EntityShadowRenderable();
              
              /// Create the separate light cap if it doesn't already exists.
              void _createSeparateLightCap();
              /// @copydoc ShadowRenderable::getWorldTransforms.
              void getWorldTransforms(Matrix4* xform) const;
              HardwareVertexBufferSharedPtr getPositionBuffer(void) { return mPositionBuffer; }
              HardwareVertexBufferSharedPtr getWBuffer(void) { return mWBuffer; }
              /// Rebind the source positions (for temp buffer users).
              void rebindPositionBuffer(const VertexData* vertexData, bool force);
              /// @copydoc ShadowRenderable::isVisible.
              bool isVisible(void) const;
              /// @copydoc ShadowRenderable::rebindIndexBuffer.
              virtual void rebindIndexBuffer(const HardwareIndexBufferSharedPtr& indexBuffer);
          };
      public:
          /** Default destructor.
          */
          ~Entity();
  
          /** Gets the Mesh that this Entity is based on.
          */
          const MeshPtr& getMesh(void) const;
  
          /** Gets a pointer to a SubEntity, ie a part of an Entity.
           @deprecated use getSubEntities()
          */
          SubEntity* getSubEntity(size_t index) const;
  
          /** Gets a pointer to a SubEntity by name
          @remarks 
              Names should be initialized during a Mesh creation.
          */
          SubEntity* getSubEntity( const String& name ) const;
  
          /** Retrieves the number of SubEntity objects making up this entity.
          * @deprecated use getSubEntities()
          */
          size_t getNumSubEntities(void) const;
  
          /** Retrieves SubEntity objects making up this entity.
          */
          const SubEntityList& getSubEntities() const {
              return mSubEntityList;
          }
  
          /** Clones this entity and returns a pointer to the clone.
          @remarks
              Useful method for duplicating an entity. The new entity must be
              given a unique name, and is not attached to the scene in any way
              so must be attached to a SceneNode to be visible (exactly as
              entities returned from SceneManager::createEntity).
          @param newName
              Name for the new entity.
          */
          Entity* clone( const String& newName ) const;
  
          /** Sets the material to use for the whole of this entity.
          @remarks
              This is a shortcut method to set all the materials for all
              subentities of this entity. Only use this method is you want to
              set the same material for all subentities or if you know there
              is only one. Otherwise call getSubEntity() and call the same
              method on the individual SubEntity.
          */
          void setMaterialName( const String& name, const String& groupName = ResourceGroupManager::AUTODETECT_RESOURCE_GROUP_NAME );
  
          
          /** Sets the material to use for the whole of this entity.
          @remarks
              This is a shortcut method to set all the materials for all
              subentities of this entity. Only use this method is you want to
              set the same material for all subentities or if you know there
              is only one. Otherwise call getSubEntity() and call the same
              method on the individual SubEntity.
          */
          void setMaterial(const MaterialPtr& material);
  
          /** @copydoc MovableObject::_releaseManualHardwareResources */
          void _releaseManualHardwareResources();
          /** @copydoc MovableObject::_restoreManualHardwareResources */
          void _restoreManualHardwareResources();
  
          /** @copydoc MovableObject::_notifyCurrentCamera
          */
          void _notifyCurrentCamera(Camera* cam);
  
          /// @copydoc MovableObject::setRenderQueueGroup
          void setRenderQueueGroup(uint8 queueID);
  
          /// @copydoc MovableObject::setRenderQueueGroupAndPriority
          void setRenderQueueGroupAndPriority(uint8 queueID, ushort priority);
  
          /** @copydoc MovableObject::getBoundingBox
          */
          const AxisAlignedBox& getBoundingBox(void) const;
  
          /// Merge all the child object Bounds a return it.
          AxisAlignedBox getChildObjectsBoundingBox(void) const;
  
          /** @copydoc MovableObject::_updateRenderQueue
          */
          void _updateRenderQueue(RenderQueue* queue);
  
          /** @copydoc MovableObject::getMovableType */
          const String& getMovableType(void) const;
  
          /** For entities based on animated meshes, gets the AnimationState object for a single animation.
          @remarks
              You animate an entity by updating the animation state objects. Each of these represents the
              current state of each animation available to the entity. The AnimationState objects are
              initialised from the Mesh object.
          */
          AnimationState* getAnimationState(const String& name) const;
          /** Returns whether the AnimationState with the given name exists. */
          bool hasAnimationState(const String& name) const;
          /** For entities based on animated meshes, gets the AnimationState objects for all animations.
          @return
              In case the entity is animated, this functions returns the pointer to a AnimationStateSet
              containing all animations of the entries. If the entity is not animated, it returns 0.
          @remarks
              You animate an entity by updating the animation state objects. Each of these represents the
              current state of each animation available to the entity. The AnimationState objects are
              initialised from the Mesh object.
          */
          AnimationStateSet* getAllAnimationStates(void) const;
  
          /** Tells the Entity whether or not it should display it's skeleton, if it has one.
          */
          void setDisplaySkeleton(bool display);
  
          /** Returns whether or not the entity is currently displaying its skeleton.
          */
          bool getDisplaySkeleton(void) const;
  
          /** Returns the number of manual levels of detail that this entity supports.
          @remarks
              This number never includes the original entity, it is difference
              with Mesh::getNumLodLevels.
          */
          size_t getNumManualLodLevels(void) const;
  
          /** Returns the current LOD used to render
          */
          ushort getCurrentLodIndex() { return mMeshLodIndex; }
  
          /** Gets a pointer to the entity representing the numbered manual level of detail.
          @remarks
              The zero-based index never includes the original entity, unlike
              Mesh::getLodLevel.
          */
          Entity* getManualLodLevel(size_t index) const;
  
  #if !OGRE_NO_MESHLOD
          /** Sets a level-of-detail bias for the mesh detail of this entity.
          @remarks
              Level of detail reduction is normally applied automatically based on the Mesh
              settings. However, it is possible to influence this behaviour for this entity
              by adjusting the LOD bias. This 'nudges' the mesh level of detail used for this
              entity up or down depending on your requirements. You might want to use this
              if there was a particularly important entity in your scene which you wanted to
              detail better than the others, such as a player model.
          @par
              There are three parameters to this method; the first is a factor to apply; it
              defaults to 1.0 (no change), by increasing this to say 2.0, this model would
              take twice as long to reduce in detail, whilst at 0.5 this entity would use lower
              detail versions twice as quickly. The other 2 parameters are hard limits which
              let you set the maximum and minimum level-of-detail version to use, after all
              other calculations have been made. This lets you say that this entity should
              never be simplified, or that it can only use LODs below a certain level even
              when right next to the camera.
          @param factor
              Proportional factor to apply to the distance at which LOD is changed.
              Higher values increase the distance at which higher LODs are displayed (2.0 is
              twice the normal distance, 0.5 is half).
          @param maxDetailIndex
              The index of the maximum LOD this entity is allowed to use (lower
              indexes are higher detail: index 0 is the original full detail model).
          @param minDetailIndex
              The index of the minimum LOD this entity is allowed to use (higher
              indexes are lower detail). Use something like 99 if you want unlimited LODs (the actual
              LOD will be limited by the number in the Mesh).
          */
          void setMeshLodBias(Real factor, ushort maxDetailIndex = 0, ushort minDetailIndex = 99);
  
          /** Sets a level-of-detail bias for the material detail of this entity.
          @remarks
              Level of detail reduction is normally applied automatically based on the Material
              settings. However, it is possible to influence this behaviour for this entity
              by adjusting the LOD bias. This 'nudges' the material level of detail used for this
              entity up or down depending on your requirements. You might want to use this
              if there was a particularly important entity in your scene which you wanted to
              detail better than the others, such as a player model.
          @par
              There are three parameters to this method; the first is a factor to apply; it
              defaults to 1.0 (no change), by increasing this to say 2.0, this entity would
              take twice as long to use a lower detail material, whilst at 0.5 this entity
              would use lower detail versions twice as quickly. The other 2 parameters are
              hard limits which let you set the maximum and minimum level-of-detail index
              to use, after all other calculations have been made. This lets you say that
              this entity should never be simplified, or that it can only use LODs below
              a certain level even when right next to the camera.
          @param factor
              Proportional factor to apply to the distance at which LOD is changed.
              Higher values increase the distance at which higher LODs are displayed (2.0 is
              twice the normal distance, 0.5 is half).
          @param maxDetailIndex
              The index of the maximum LOD this entity is allowed to use (lower
              indexes are higher detail: index 0 is the original full detail model).
          @param minDetailIndex
              The index of the minimum LOD this entity is allowed to use (higher
              indexes are lower detail. Use something like 99 if you want unlimited LODs (the actual
              LOD will be limited by the number of LOD indexes used in the Material).
          */
          void setMaterialLodBias(Real factor, ushort maxDetailIndex = 0, ushort minDetailIndex = 99);
  #endif
          /** Sets whether the polygon mode of this entire entity may be
              overridden by the camera detail settings.
          */
          void setPolygonModeOverrideable(bool PolygonModeOverrideable);
          /** Attaches another object to a certain bone of the skeleton which this entity uses.
          @remarks
              This method can be used to attach another object to an animated part of this entity,
              by attaching it to a bone in the skeleton (with an offset if required). As this entity
              is animated, the attached object will move relative to the bone to which it is attached.
          @par
              An exception is thrown if the movable object is already attached to the bone, another bone or scenenode.
              If the entity has no skeleton or the bone name cannot be found then an exception is thrown.
          @param boneName
              The name of the bone (in the skeleton) to attach this object
          @param pMovable
              Pointer to the object to attach
          @param offsetOrientation
              An adjustment to the orientation of the attached object, relative to the bone.
          @param offsetPosition
              An adjustment to the position of the attached object, relative to the bone.
          @return
              The TagPoint to which the object has been attached
          */
          TagPoint* attachObjectToBone(const String &boneName,
              MovableObject *pMovable,
              const Quaternion &offsetOrientation = Quaternion::IDENTITY,
              const Vector3 &offsetPosition = Vector3::ZERO);
  
          /** Detach a MovableObject previously attached using attachObjectToBone.
              If the movable object name is not found then an exception is raised.
          @param movableName
              The name of the movable object to be detached.
          */
          MovableObject* detachObjectFromBone(const String &movableName);
  
          /** Detaches an object by pointer.
          @remarks
              Use this method to destroy a MovableObject which is attached to a bone of belonging this entity.
              But sometimes the object may be not in the child object list because it is a LOD entity,
              this method can safely detect and ignore in this case and won't raise an exception.
          */
          void detachObjectFromBone(MovableObject* obj);
  
          /// Detach all MovableObjects previously attached using attachObjectToBone
          void detachAllObjectsFromBone(void);
  
          typedef MapIterator<ChildObjectList> ChildObjectListIterator;
          /** Gets an iterator to the list of objects attached to bones on this entity. */
          ChildObjectListIterator getAttachedObjectIterator(void);
          /** @copydoc MovableObject::getBoundingRadius */
          Real getBoundingRadius(void) const;
  
          /** @copydoc MovableObject::getWorldBoundingBox */
          const AxisAlignedBox& getWorldBoundingBox(bool derive = false) const;
          /** @copydoc MovableObject::getWorldBoundingSphere */
          const Sphere& getWorldBoundingSphere(bool derive = false) const;
  
          /** @copydoc ShadowCaster::getEdgeList */
          EdgeData* getEdgeList(void);
          /** @copydoc ShadowCaster::hasEdgeList */
          bool hasEdgeList(void);
          /** @copydoc ShadowCaster::getShadowVolumeRenderableIterator */
          ShadowRenderableListIterator getShadowVolumeRenderableIterator(
              ShadowTechnique shadowTechnique, const Light* light,
              HardwareIndexBufferSharedPtr* indexBuffer, size_t* indexBufferUsedSize,
              bool extrudeVertices, Real extrusionDistance, unsigned long flags = 0);
  
          /** Internal method for retrieving bone matrix information. */
          const Matrix4* _getBoneMatrices(void) const { return mBoneMatrices;}
          /** Internal method for retrieving bone matrix information. */
          unsigned short _getNumBoneMatrices(void) const { return mNumBoneMatrices; }
          /** Returns whether or not this entity is skeletally animated. */
          bool hasSkeleton(void) const { return mSkeletonInstance != 0; }
          /** Get this Entity's personal skeleton instance. */
          SkeletonInstance* getSkeleton(void) const { return mSkeletonInstance; }
          /** Returns whether or not hardware animation is enabled.
          @remarks
              Because fixed-function indexed vertex blending is rarely supported
              by existing graphics cards, hardware animation can only be done if
              the vertex programs in the materials used to render an entity support
              it. Therefore, this method will only return true if all the materials
              assigned to this entity have vertex programs assigned, and all those
              vertex programs must support 'includes_morph_animation true' if using
              morph animation, 'includes_pose_animation true' if using pose animation
              and 'includes_skeletal_animation true' if using skeletal animation.
  
              Also note the the function returns value according to the current active
              scheme. This is due to the fact that RTSS schemes may be different in their
              handling of hardware animation.
          */
          bool isHardwareAnimationEnabled(void);
  
          /** @copydoc MovableObject::_notifyAttached */
          void _notifyAttached(Node* parent, bool isTagPoint = false);
          /** Returns the number of requests that have been made for software animation
          @remarks
              If non-zero then software animation will be performed in updateAnimation
              regardless of the current setting of isHardwareAnimationEnabled or any
              internal optimise for eliminate software animation. Requests for software
              animation are made by calling the addSoftwareAnimationRequest() method.
          */
          int getSoftwareAnimationRequests(void) const { return mSoftwareAnimationRequests; }
          /** Returns the number of requests that have been made for software animation of normals
          @remarks
              If non-zero, and getSoftwareAnimationRequests() also returns non-zero,
              then software animation of normals will be performed in updateAnimation
              regardless of the current setting of isHardwareAnimationEnabled or any
              internal optimise for eliminate software animation. Currently it is not
              possible to force software animation of only normals. Consequently this
              value is always less than or equal to that returned by getSoftwareAnimationRequests().
              Requests for software animation of normals are made by calling the
              addSoftwareAnimationRequest() method with 'true' as the parameter.
          */
          int getSoftwareAnimationNormalsRequests(void) const { return mSoftwareAnimationNormalsRequests; }
          /** Add a request for software animation
          @remarks
              Tells the entity to perform animation calculations for skeletal/vertex
              animations in software, regardless of the current setting of
              isHardwareAnimationEnabled().  Software animation will be performed
              any time one or more requests have been made.  If 'normalsAlso' is
              'true', then the entity will also do software blending on normal
              vectors, in addition to positions. This advanced method useful for
              situations in which access to actual mesh vertices is required,
              such as accurate collision detection or certain advanced shading
              techniques. When software animation is no longer needed,
              the caller of this method should always remove the request by calling
              removeSoftwareAnimationRequest(), passing the same value for
              'normalsAlso'.
          */
          void addSoftwareAnimationRequest(bool normalsAlso);
          /** Removes a request for software animation
          @remarks
              Calling this decrements the entity's internal counter of the number
              of requests for software animation.  If the counter is already zero
              then calling this method throws an exception.  The 'normalsAlso'
              flag if set to 'true' will also decrement the internal counter of
              number of requests for software animation of normals.
          */
          void removeSoftwareAnimationRequest(bool normalsAlso);
  
          /** Shares the SkeletonInstance with the supplied entity.
              Note that in order for this to work, both entities must have the same
              Skeleton.
          */
          void shareSkeletonInstanceWith(Entity* entity);
  
          /** Returns whether or not this entity is either morph or pose animated.
          */
          bool hasVertexAnimation(void) const;
  
  
          /** Stops sharing the SkeletonInstance with other entities.
          */
          void stopSharingSkeletonInstance();
  
  
          /** Returns whether this entity shares it's SkeltonInstance with other entity instances.
          */
          inline bool sharesSkeletonInstance() const { return mSharedSkeletonEntities != NULL; }
  
          /** Returns a pointer to the set of entities which share a SkeletonInstance.
              If this instance does not share it's SkeletonInstance with other instances @c NULL will be returned
          */
          inline const EntitySet* getSkeletonInstanceSharingSet() const { return mSharedSkeletonEntities; }
  
          /** Updates the internal animation state set to include the latest
              available animations from the attached skeleton.
          @remarks
              Use this method if you manually add animations to a skeleton, or have
              linked the skeleton to another for animation purposes since creating
              this entity.
          @note
              If you have called getAnimationState prior to calling this method,
              the pointers will still remain valid.
          */
          void refreshAvailableAnimationState(void);
  
          /** Advanced method to perform all the updates required for an animated entity.
          @remarks
              You don't normally need to call this, but it's here in case you wish
              to manually update the animation of an Entity at a specific point in
              time. Animation will not be updated more than once a frame no matter
              how many times you call this method.
          */
          void _updateAnimation(void);
  
          /** Tests if any animation applied to this entity.
          @remarks
              An entity is animated if any animation state is enabled, or any manual bone
              applied to the skeleton.
          */
          bool _isAnimated(void) const;
  
          /** Tests if skeleton was animated.
          */
          bool _isSkeletonAnimated(void) const;
  
          /** Advanced method to get the temporarily blended skeletal vertex information
              for entities which are software skinned.
          @remarks
              Internal engine will eliminate software animation if possible, this
              information is unreliable unless added request for software animation
              via addSoftwareAnimationRequest.
          @note
              The positions/normals of the returned vertex data is in object space.
          */
          VertexData* _getSkelAnimVertexData(void) const;
          /** Advanced method to get the temporarily blended software vertex animation information
          @remarks
              Internal engine will eliminate software animation if possible, this
              information is unreliable unless added request for software animation
              via addSoftwareAnimationRequest.
          @note
              The positions/normals of the returned vertex data is in object space.
          */
          VertexData* _getSoftwareVertexAnimVertexData(void) const;
          /** Advanced method to get the hardware morph vertex information
          @note
              The positions/normals of the returned vertex data is in object space.
          */
          VertexData* _getHardwareVertexAnimVertexData(void) const;
          /** Advanced method to get the temp buffer information for software
              skeletal animation.
          */
          TempBlendedBufferInfo* _getSkelAnimTempBufferInfo(void);
          /** Advanced method to get the temp buffer information for software
              morph animation.
          */
          TempBlendedBufferInfo* _getVertexAnimTempBufferInfo(void);
          /// Override to return specific type flag.
          uint32 getTypeFlags(void) const;
          /// Retrieve the VertexData which should be used for GPU binding.
          VertexData* getVertexDataForBinding(void);
  
          /// Identify which vertex data we should be sending to the renderer.
          enum VertexDataBindChoice
          {
              BIND_ORIGINAL,
              BIND_SOFTWARE_SKELETAL,
              BIND_SOFTWARE_MORPH,
              BIND_HARDWARE_MORPH
          };
          /// Choose which vertex data to bind to the renderer.
          VertexDataBindChoice chooseVertexDataForBinding(bool hasVertexAnim);
  
          /** Are buffers already marked as vertex animated? */
          bool _getBuffersMarkedForAnimation(void) const { return mVertexAnimationAppliedThisFrame; }
          /** Mark just this vertex data as animated.
          */
          void _markBuffersUsedForAnimation(void);
  
          /** Has this Entity been initialised yet?
          @remarks
              If this returns false, it means this Entity hasn't been completely
              constructed yet from the underlying resources (Mesh, Skeleton), which 
              probably means they were delay-loaded and aren't available yet. This
              Entity won't render until it has been successfully initialised, nor
              will many of the manipulation methods function.
          */
          bool isInitialised(void) const { return mInitialised; }
  
          /** Try to initialise the Entity from the underlying resources.
          @remarks
              This method builds the internal structures of the Entity based on it
              resources (Mesh, Skeleton). This may or may not succeed if the 
              resources it references have been earmarked for background loading,
              so you should check isInitialised afterwards to see if it was successful.
          @param forceReinitialise
              If @c true, this forces the Entity to tear down it's
              internal structures and try to rebuild them. Useful if you changed the
              content of a Mesh or Skeleton at runtime.
          */
          void _initialise(bool forceReinitialise = false);
          /** Tear down the internal structures of this Entity, rendering it uninitialised. */
          void _deinitialise(void);
  
          /** Resource::Listener hook to notify Entity that a delay-loaded Mesh is
              complete.
          */
          void backgroundLoadingComplete(Resource* res);
  
          /// @copydoc MovableObject::visitRenderables
          void visitRenderables(Renderable::Visitor* visitor, 
              bool debugRenderables = false);
  
          /** Get the LOD strategy transformation of the mesh LOD factor. */
          Real _getMeshLodFactorTransformed() const;
          
          /** Entity's skeleton's AnimationState will not be automatically updated when set to true.
              Useful if you wish to handle AnimationState updates manually.
          */
          void setSkipAnimationStateUpdate(bool skip) {
              mSkipAnimStateUpdates = skip;
          }
          
          /** Entity's skeleton's AnimationState will not be automatically updated when set to true.
              Useful if you wish to handle AnimationState updates manually.
          */
          bool getSkipAnimationStateUpdate() const {
              return mSkipAnimStateUpdates;
          }
  
          /** The skeleton of the main entity will be updated even if the an LOD entity is being displayed.
              useful if you have entities attached to the main entity. Otherwise position of attached
              entities will not be updated.
          */
          void setAlwaysUpdateMainSkeleton(bool update) {
              mAlwaysUpdateMainSkeleton = update;
          }
  
          /** The skeleton of the main entity will be updated even if the an LOD entity is being displayed.
              useful if you have entities attached to the main entity. Otherwise position of attached
              entities will not be updated.
          */
          bool getAlwaysUpdateMainSkeleton() const {
              return mAlwaysUpdateMainSkeleton;
          }
  
          /** If true, the skeleton of the entity will be used to update the bounding box for culling.
              Useful if you have skeletal animations that move the bones away from the root.  Otherwise, the
              bounding box of the mesh in the binding pose will be used.
          @remarks
              When true, the bounding box will be generated to only enclose the bones that are used for skinning.
              Also the resulting bounding box will be expanded by the amount of GetMesh()->getBoneBoundingRadius().
              The expansion amount can be changed on the mesh to achieve a better fitting bounding box.
          */
          void setUpdateBoundingBoxFromSkeleton(bool update);
  
          /** If true, the skeleton of the entity will be used to update the bounding box for culling.
              Useful if you have skeletal animations that move the bones away from the root.  Otherwise, the
              bounding box of the mesh in the binding pose will be used.
          */
          bool getUpdateBoundingBoxFromSkeleton() const {
              return mUpdateBoundingBoxFromSkeleton;
          }
  
          
      };
  
      /** Factory object for creating Entity instances */
      class _OgreExport EntityFactory : public MovableObjectFactory
      {
      protected:
          MovableObject* createInstanceImpl( const String& name, const NameValuePairList* params);
      public:
          EntityFactory() {}
          ~EntityFactory() {}
  
          static String FACTORY_TYPE_NAME;
  
          const String& getType(void) const;
          void destroyInstance( MovableObject* obj);
  
      };
      /** @} */
      /** @} */
  
  } // namespace Ogre
  
  #include "OgreHeaderSuffix.h"
  
  #endif // __Entity_H__
  