// Copyright (C) 2002-2007 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h

#include "CParticleFadeOutAffector.h"
#include "IAttributes.h"
#include "os.h"

namespace irr
{
namespace scene
{

//! constructor
CParticleFadeOutAffector::CParticleFadeOutAffector(
	video::SColor targetColor, u32 fadeOutTime)
	: IParticleAffector(), TargetColor(targetColor)
{
	FadeOutTime = fadeOutTime ? (f32)fadeOutTime : 1.0f;
}


//! Affects an array of particles.
void CParticleFadeOutAffector::affect(u32 now, SParticle* particlearray, u32 count)
{
	if (!Enabled)
		return;
	f32 d;

	for (u32 i=0; i<count; ++i)
	{
		if (particlearray[i].endTime - now < FadeOutTime)
		{
			d = (particlearray[i].endTime - now) / FadeOutTime;
			particlearray[i].color = particlearray[i].startColor.getInterpolated(
				TargetColor, d);
		}
	}
}


//! Writes attributes of the object.
//! Implement this to expose the attributes of your scene node animator for 
//! scripting languages, editors, debuggers or xml serialization purposes.
void CParticleFadeOutAffector::serializeAttributes(io::IAttributes* out, io::SAttributeReadWriteOptions* options)
{
	out->addColor("TargetColor", TargetColor);
	out->addFloat("FadeOutTime", FadeOutTime);
}

//! Reads attributes of the object.
//! Implement this to set the attributes of your scene node animator for 
//! scripting languages, editors, debuggers or xml deserialization purposes.
//! \param startIndex: start index where to start reading attributes.
//! \return: returns last index of an attribute read by this affector
s32 CParticleFadeOutAffector::deserializeAttributes(s32 startIndex, io::IAttributes* in, io::SAttributeReadWriteOptions* options)
{
	const char* name = in->getAttributeName(startIndex);

	if (!name || strcmp(name, "TargetColor"))
		return startIndex; // attribute not valid

	TargetColor = in->getAttributeAsColor(startIndex);
	++startIndex;

	name = in->getAttributeName(startIndex);
	if (!name || strcmp(name, "FadeOutTime"))
		return startIndex; // attribute not valid

	FadeOutTime = in->getAttributeAsFloat(startIndex);

	++startIndex;
	return startIndex;
}


} // end namespace scene
} // end namespace irr