axmol/extensions/Particle3D/PU/CCPUAffector.cpp

/****************************************************************************
 Copyright (C) 2013 Henry van Merode. All rights reserved.
 Copyright (c) 2015-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

 https://axmolengine.github.io/

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#include "extensions/Particle3D/PU/CCPUAffector.h"
#include "extensions/Particle3D/PU/CCPUEmitter.h"
#include "extensions/Particle3D/PU/CCPUParticleSystem3D.h"

NS_AX_BEGIN

PUAffector::PUAffector() : _affectorScale(Vec3::ONE), _affectSpecialisation(AFSP_DEFAULT), _mass(1.0f) {}

PUAffector::~PUAffector()
{
    _particleSystem = nullptr;
}

void PUAffector::updatePUAffector(PUParticle3D* /*particle*/, float /*delta*/) {}

const Vec3& PUAffector::getDerivedPosition()
{
    PUParticleSystem3D* ps = static_cast<PUParticleSystem3D*>(_particleSystem);
    if (ps)
    {
        Mat4 rotMat;
        Mat4::createRotation(ps->getDerivedOrientation(), &rotMat);
        _derivedPosition =
            ps->getDerivedPosition() + rotMat * Vec3(_position.x * _affectorScale.x, _position.y * _affectorScale.y,
                                                     _position.z * _affectorScale.z);
        //_particleSystem->getNodeToWorldTransform().transformPoint(_position, &_derivedPosition);
    }
    else
        _derivedPosition = _position;

    return _derivedPosition;

    // if (mMarkedForEmission)
    //{
    //	// Use the affector position, because it is emitted
    //	// If a particle is emitted, position and derived position are the same
    //	_derivedPosition = position;
    // }
    // else
    //{
    //	// Add the techniques' derived position
    //	_derivedPosition = mParentTechnique->getDerivedPosition() +
    //		mParentTechnique->getParentSystem()->getDerivedOrientation() * (_mAffectorScale * position);
    // }
    // return _derivedPosition;
}

float PUAffector::calculateAffectSpecialisationFactor(const PUParticle3D* particle)
{
    // Assume that particle->totalTimeToLive != 0, which is reasonable
    switch (_affectSpecialisation)
    {
    case AFSP_DEFAULT:
        return 1.0f;
        break;

        // This means that older particles will be affected MORE than just emitted particles
    case AFSP_TTL_INCREASE:
    {
        if (particle)
        {
            return particle->timeFraction;
        }
        else
        {
            return 1.0f;
        }
    }
    break;

        // This means that older particles will be affected LESS than just emitted particles
    case AFSP_TTL_DECREASE:
    {
        if (particle)
        {
            return 1.0f - particle->timeFraction;
        }
        else
        {
            return 1.0f;
        }
    }
    break;

    default:
        return 1.0f;
        break;
    }
}

void PUAffector::notifyStart() {}

void PUAffector::notifyStop() {}

void PUAffector::notifyPause() {}

void PUAffector::notifyResume() {}

void PUAffector::preUpdateAffector(float /*deltaTime*/) {}

void PUAffector::postUpdateAffector(float /*deltaTime*/) {}

void PUAffector::prepare() {}

void PUAffector::unPrepare() {}

void PUAffector::initParticleForEmission(PUParticle3D* /*particle*/) {}

void PUAffector::notifyRescaled(const Vec3& scale)
{
    _affectorScale = scale;
}

void PUAffector::firstParticleUpdate(PUParticle3D* /*particle*/, float /*deltaTime*/) {}

void PUAffector::setMass(float mass)
{
    _mass = mass;
}

float PUAffector::getMass() const
{
    return _mass;
}

void PUAffector::copyAttributesTo(PUAffector* affector)
{
    affector->setName(_name);
    affector->setAffectorType(_affectorType);
    affector->_position             = _position;
    affector->_isEnabled            = _isEnabled;
    affector->_particleSystem       = _particleSystem;
    affector->_affectorScale        = _affectorScale;
    affector->_affectSpecialisation = _affectSpecialisation;
    affector->_excludedEmitters     = _excludedEmitters;
}

void PUAffector::addEmitterToExclude(std::string_view emitterName)
{
    auto iter = std::find(_excludedEmitters.begin(), _excludedEmitters.end(), emitterName);
    if (iter == _excludedEmitters.end())
    {
        _excludedEmitters.emplace_back(std::string{emitterName});
    }
}

void PUAffector::removeEmitterToExclude(std::string_view emitterName)
{
    auto iter = std::find(_excludedEmitters.begin(), _excludedEmitters.end(), emitterName);
    if (iter != _excludedEmitters.end())
    {
        _excludedEmitters.erase(iter);
    }
}

void PUAffector::process(PUParticle3D* particle, float delta, bool firstParticle)
{
    if (firstParticle)
    {
        firstParticleUpdate(particle, delta);
    }

    if (!_excludedEmitters.empty() && particle->parentEmitter)
    {
        // Return if the emitter which emits this particle is part of the vector
        auto emitterName = particle->parentEmitter->getName();
        auto iter        = std::find(_excludedEmitters.begin(), _excludedEmitters.end(), emitterName);
        if (iter != _excludedEmitters.end())
        {
            return;
        }
    }

    updatePUAffector(particle, delta);
}

NS_AX_END