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+/** 
+ * @file llflexibleobject.h
+ * @author JJ Ventrella, Andrew Meadows, Tom Yedwab
+ * @brief Flexible object definition
+ *
+ * Copyright (c) 2006-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+/**
+ * This is for specifying objects in the world that are animated and 
+ * rendered locally - on the viewer. Flexible Objects are linear arrays
+ * of positions, which stay at a fixed distance from each other. One 
+ * position is fixed as an "anchor" and is attached to some other object 
+ * in the world, determined by the server. All the other positions are 
+ * updated according to local physics. 
+ */
+
+#ifndef LL_LLFLEXIBLEOBJECT_H
+#define LL_LLFLEXIBLEOBJECT_H
+
+#include "llmemory.h"
+#include "llprimitive.h"
+#include "llvovolume.h"
+#include "llwind.h"
+
+// 10 ms for the whole thing!
+const F32	FLEXIBLE_OBJECT_TIMESLICE		= 0.003f;
+const U32	FLEXIBLE_OBJECT_MAX_LOD			= 10;
+
+// See llprimitive.h for LLFlexibleObjectData and DEFAULT/MIN/MAX values 
+
+//-------------------------------------------------------------------
+
+struct LLFlexibleObjectSection
+{
+	// Input parameters
+	LLVector2		mScale;
+	LLQuaternion	mAxisRotation;
+	// Simulated state
+	LLVector3		mPosition;
+	LLVector3		mVelocity;
+	LLVector3		mDirection;
+	LLQuaternion	mRotation;
+	// Derivatives (Not all currently used, will come back with LLVolume changes to automagically generate normals)
+	LLVector3		mdPosition;
+	//LLMatrix4		mRotScale;
+	//LLMatrix4		mdRotScale;
+};
+
+//---------------------------------------------------------
+// The LLVolumeImplFlexible class 
+//---------------------------------------------------------
+class LLVolumeImplFlexible : public LLVolumeInterface
+{
+	public:
+		LLVolumeImplFlexible(LLViewerObject* volume, LLFlexibleObjectData* attributes);
+
+		// Implements LLVolumeInterface
+		LLVector3 getFramePosition() const;
+		LLQuaternion getFrameRotation() const;
+		LLVolumeInterfaceType getInterfaceType() const		{ return INTERFACE_FLEXIBLE; }
+		BOOL doIdleUpdate(LLAgent &agent, LLWorld &world, const F64 &time);
+		BOOL doUpdateGeometry(LLDrawable *drawable);
+		LLVector3 getPivotPosition() const;
+		void onSetVolume(const LLVolumeParams &volume_params, const S32 detail);
+		void onSetScale(const LLVector3 &scale, BOOL damped);
+		void onParameterChanged(U16 param_type, LLNetworkData *data, BOOL in_use, bool local_origin);
+		void onShift(const LLVector3 &shift_vector);
+		bool isVolumeUnique() const { return true; }
+		bool isVolumeGlobal() const { return true; }
+		bool isActive() const { return true; }
+		const LLMatrix4& getWorldMatrix(LLXformMatrix* xform) const;
+		void updateRelativeXform(BOOL global_volume = FALSE);
+		void doFlexibleUpdate(); // Called to update the simulation
+		void doFlexibleRebuild(); // Called to rebuild the geometry
+		static void resetUpdateBins();
+		static void doFlexibleUpdateBins();
+
+		//void				setAttributes( LLFlexibleObjectData );
+		void				setParentPositionAndRotationDirectly( LLVector3 p, LLQuaternion r );
+		void				setUsingCollisionSphere( bool u );
+		void				setCollisionSphere( LLVector3 position, F32 radius );
+		void				setRenderingCollisionSphere( bool r);
+
+		LLVector3			getEndPosition();
+		LLQuaternion		getEndRotation();
+		LLVector3			getNodePosition( int nodeIndex );
+		LLVector3			getAnchorPosition() const;
+
+	private:
+		//--------------------------------------
+		// private members
+		//--------------------------------------
+		LLViewerObject*				mVO;
+		LLTimer						mTimer;
+		LLVector3					mAnchorPosition;
+		LLVector3					mParentPosition;
+		LLQuaternion				mParentRotation;
+		LLQuaternion				mInitialAxisRotation;
+		LLQuaternion				mLastSegmentRotation;
+		BOOL						mInitialized;
+		BOOL						mUpdated;
+		LLFlexibleObjectData*		mAttributes;
+		LLFlexibleObjectSection		mSection	[ (1<<FLEXIBLE_OBJECT_MAX_SECTIONS)+1 ];
+		S32							mInitializedRes;
+		S32							mSimulateRes;
+		S32							mRenderRes;
+		U32							mFrameNum;
+		LLVector3					mCollisionSpherePosition;
+		F32							mCollisionSphereRadius;
+		
+		U64							mLastUpdate;
+
+		BOOL						mJustShifted;
+
+		//--------------------------------------
+		// private methods
+		//--------------------------------------
+		void setAttributesOfAllSections	();
+
+		void remapSections(LLFlexibleObjectSection *source, S32 source_sections,
+										 LLFlexibleObjectSection *dest, S32 dest_sections);
+
+		U64 getLastUpdate() const	{ return mLastUpdate; }
+
+		// LOD Bins
+		struct FlexCompare
+		{
+			bool operator()(LLVolumeImplFlexible* a, LLVolumeImplFlexible* b) const
+			{
+				U64 a_update = a->getLastUpdate();
+				U64 b_update = b->getLastUpdate();
+				if (a_update == b_update)
+				{
+					return a < b; // compare pointers
+				}
+				return a_update < b_update;
+			}
+		};
+		typedef std::set<LLVolumeImplFlexible*, FlexCompare> lodset_t;
+		static lodset_t sLODBins[ FLEXIBLE_OBJECT_MAX_LOD ];
+		static U64					sCurrentUpdateFrame;
+		static U32					sDebugInserted;
+		static U32					sDebugVisible;
+
+public:
+		// Global setting for update rate
+		static F32					sUpdateFactor;
+
+};// end of class definition
+
+
+#endif // LL_LLFLEXIBLEOBJECT_H