Bone.h
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Bone.h
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	#ifndef _ECHOBONE_H_
	#define _ECHOBONE_H_

	#include <echo/Graphics/Node.h>

	namespace Echo
	{
	class Skeleton;

	class Bone : public Node
	{
	private:
	friend class Skeleton;
	Skeleton& mSkeleton;
	size_t mIndex;
	Vector3 mBindDerivedInversePosition;
	Vector3 mBindDerivedInverseScale;
	Quaternion mBindDerivedInverseOrientation;
	bool mManuallyControlled;
	Matrix4 mCachedOffsetTransform;
	Bone(Skeleton& skeleton, size_t index) : mSkeleton(skeleton), mIndex(index), mManuallyControlled(false)
	{
	mCachedOffsetTransform=Matrix4::IDENTITY;
	}
	public:
	~Bone()
	{
	}

	Skeleton& GetSkeleton() { return mSkeleton; }

	const size_t& GetIndex() const { return mIndex; }

	void SetInitialState()
	{
	mInitialOrientation=mOrientation;
	mInitialPosition=mPosition;
	mInitialScale=mScale;
	}

	void SetBindingPose()
	{
	// Save inverse derived position/scale/orientation, used for calculate offset transform later
	mBindDerivedInversePosition = - GetDerivedPosition();
	mBindDerivedInverseScale = Vector3(1,1,1) / GetDerivedScale();
	mBindDerivedInverseOrientation = GetDerivedOrientation().Inverse();
	}

	const Vector3& GetBindDerivedInversePosition() const { return mBindDerivedInversePosition; }
	const Vector3& GetBindDerivedInverseScale() const { return mBindDerivedInverseScale; }
	const Quaternion& GetBindDerivedInverseOrientation() const { return mBindDerivedInverseOrientation; }

	//Currently not used
	bool GetManuallyControlled() const { return mManuallyControlled; }
	void SetManuallyControlled(bool val) { mManuallyControlled = val; }

	const Matrix4& GetOffsetTransform()
	{
	if(mTransformOutOfDate)
	{
	// Combine scale with binding pose inverse scale,
	// NB just combine as equivalent axes, no shearing
	Vector3 scale = GetDerivedScale() * mBindDerivedInverseScale;

	// Combine orientation with binding pose inverse orientation
	Quaternion rotate = GetDerivedOrientation() * mBindDerivedInverseOrientation;

	// Combine position with binding pose inverse position,
	// Note that translation is relative to scale & rotation,
	// so first reverse transform original derived position to
	// binding pose bone space, and then transform to current
	// derived bone space.
	Vector3 translate = GetDerivedPosition() + rotate * (scale * mBindDerivedInversePosition);

	mCachedOffsetTransform.MakeTransform(translate, scale, rotate);
	}
	return mCachedOffsetTransform;
	}
	};
	}
	#endif

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