VkeAnimationChannel.cpp

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/* Contact chebert@nvidia.com (Chris Hebert) for feedback */

#include "VkeAnimationChannel.h"
#include "VkeSceneAnimation.h"


double &VkeAnimationChannel::getDuration(){
	return m_parent->getDuration();
}

VkeAnimationKey::List &VkeAnimationChannel::Keys(){
	return m_keys;
}

void VkeAnimationChannel::setParent(VkeSceneAnimation *inParent){
	m_parent = inParent;
}

VkeAnimationKey *VkeAnimationChannel::newKey(double &inTime, nv_math::vec4f &inData){
	if (m_parent){
		m_parent->updateDuration(inTime);
	}
	return	m_keys.newKey(inTime, inData);
}

nv_math::vec4f cubicLerp(nv_math::vec4f inA, nv_math::vec4f inB, float inT){
	float c = (3.0 - 2.0 * inT) * inT * inT;

	inA *= (float)(1.0 - c);
	inB *= (float)c;
	nv_math::vec4f outValue = inA;
	outValue += inB;
	return outValue;
}

nv_math::quatf cubicLerp(nv_math::quatf inA, nv_math::quatf inB, float inT){
	float c = (3.0 - 2.0 * inT) * inT * inT;
	return nv_math::slerp_quats(c, inA, inB);
}

nv_math::quatf VkeAnimationChannel::currentQuatValue(){


	VkeAnimationKeyPair pair;
	double curTime = m_parent->getCurrentTime();
	m_keys.getKeys(curTime, &pair);

	//no keys found at all for this time.
	//Therefore there should not have been a channel
	//for this node in the first place.
    if (!pair.low && !pair.high) return nv_math::quatf();
	if (!pair.high){
		nv_math::vec4f vValue = pair.low->getValue();
		nv_math::quatf qValue(vValue.x, vValue.y, vValue.z, vValue.w);
		return qValue;

	}
	if (!pair.low){
		nv_math::vec4f vValue = pair.high->getValue();
		nv_math::quatf qValue(vValue.x, vValue.y, vValue.z, vValue.w);
		return qValue;

	}

	double timeDelta = pair.high->getTime() - pair.low->getTime();
    if (timeDelta == 0.0) return (nv_math::quatf)pair.low->getValue();

	double durationDelta = curTime - pair.low->getTime();

	double timeScale = durationDelta / timeDelta;

	nv_math::vec4f lowVal = pair.low->getValue();
	nv_math::vec4f highVal = pair.high->getValue();

	nv_math::quatf quatA(lowVal.x, lowVal.y, lowVal.z, lowVal.w);
	nv_math::quatf quatB(highVal.x, highVal.y, highVal.z, highVal.w);

	nv_math::quatf outQuat = cubicLerp(quatA, quatB, timeScale);

	return outQuat;
}

nv_math::vec4f VkeAnimationChannel::currentValue(){


	VkeAnimationKeyPair pair;
	double curTime = m_parent->getCurrentTime();
	m_keys.getKeys(curTime, &pair);

	//no keys found at all for this time.
	//Therefore there should not have been a channel
	//for this node in the first place.
	if (!pair.low && !pair.high) return nv_math::vec4f(0.0, 0.0, 0.0);
	if (!pair.high) return pair.low->getValue();
	if (!pair.low) return pair.high->getValue();

	double timeDelta = pair.high->getTime() - pair.low->getTime();
	if (timeDelta == 0.0) return pair.low->getValue();

	double durationDelta = curTime - pair.low->getTime();

	double timeScale = durationDelta / timeDelta;

	nv_math::vec4f lowVal = pair.low->getValue();
	nv_math::vec4f highVal = pair.high->getValue();

	nv_math::vec4f outVal = cubicLerp(lowVal, highVal, timeScale);

//	lowVal *= (float)(1.0 - timeScale);
//	highVal *= (float)timeScale;
//	highVal += lowVal;
	return outVal;
}

void VkeAnimationChannel::update(){

}