/** 
 * @file lljointstate.h
 * @brief Implementation of LLJointState class.
 *
 * $LicenseInfo:firstyear=2001&license=viewergpl$
 * 
 * Copyright (c) 2001-2009, Linden Research, Inc.
 * 
 * Second Life Viewer Source Code
 * The source code in this file ("Source Code") is provided by Linden Lab
 * to you under the terms of the GNU General Public License, version 2.0
 * ("GPL"), unless you have obtained a separate licensing agreement
 * ("Other License"), formally executed by you and Linden Lab.  Terms of
 * the GPL can be found in doc/GPL-license.txt in this distribution, or
 * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
 * 
 * There are special exceptions to the terms and conditions of the GPL as
 * it is applied to this Source Code. View the full text of the exception
 * in the file doc/FLOSS-exception.txt in this software distribution, or
 * online at
 * http://secondlifegrid.net/programs/open_source/licensing/flossexception
 * 
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 */

#ifndef LL_LLJOINTSTATE_H
#define LL_LLJOINTSTATE_H

//-----------------------------------------------------------------------------
// Header Files
//-----------------------------------------------------------------------------
#include "lljoint.h"
#include "llmemory.h"

//-----------------------------------------------------------------------------
// class LLJointState
//-----------------------------------------------------------------------------
class LLJointState : public LLRefCount
{
public:
	enum BlendPhase
	{
		INACTIVE,
		EASE_IN,
		ACTIVE,
		EASE_OUT
	};
protected:
	// associated joint
	LLJoint	*mJoint;

	// indicates which members are used
	U32		mUsage;

	// indicates weighted effect of this joint 
	F32		mWeight;

	// transformation members
	LLVector3		mPosition;	// position relative to parent joint
	LLQuaternion	mRotation;	// joint rotation relative to parent joint
	LLVector3		mScale;		// scale relative to rotated frame
	LLJoint::JointPriority	mPriority;  // how important this joint state is relative to others
public:
	// Constructor
	LLJointState()
	{
		mUsage = 0;
		mJoint = NULL;
		mUsage = 0;
		mWeight = 0.f;
		mPriority = LLJoint::USE_MOTION_PRIORITY;
	}

	LLJointState(LLJoint* joint)
	{
		mUsage = 0;
		mJoint = joint;
		mUsage = 0;
		mWeight = 0.f;
		mPriority = LLJoint::USE_MOTION_PRIORITY;
	}

	// joint that this state is applied to
	LLJoint* getJoint()				{ return mJoint; }
	const LLJoint* getJoint() const	{ return mJoint; }
	BOOL setJoint( LLJoint *joint )	{ mJoint = joint; return mJoint != NULL; }

	// transform type (bitwise flags can be combined)
	// Note that these are set automatically when various
	// member setPos/setRot/setScale functions are called.
	enum Usage
	{
		POS		= 1,
		ROT		= 2,
		SCALE	= 4,
	};
	U32 getUsage() const			{ return mUsage; }
	void setUsage( U32 usage )		{ mUsage = usage; }
	F32 getWeight() const			{ return mWeight; }
	void setWeight( F32 weight )	{ mWeight = weight; }

	// get/set position
	const LLVector3& getPosition() const		{ return mPosition; }
	void setPosition( const LLVector3& pos )	{ llassert(mUsage & POS); mPosition = pos; }

	// get/set rotation
	const LLQuaternion& getRotation() const		{ return mRotation; }
	void setRotation( const LLQuaternion& rot )	{ llassert(mUsage & ROT); mRotation = rot; }

	// get/set scale
	const LLVector3& getScale() const			{ return mScale; }
	void setScale( const LLVector3& scale )		{ llassert(mUsage & SCALE); mScale = scale; }

	// get/set priority
	LLJoint::JointPriority getPriority() const	{ return mPriority; }
	void setPriority( LLJoint::JointPriority priority ) { mPriority = priority; }

protected:
	// Destructor
	virtual ~LLJointState()
	{
	}
	
};

#endif // LL_LLJOINTSTATE_H