axmol/extensions/Particle3D/PU/CCPUInterParticleCollider.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.

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#include "CCPUInterParticleCollider.h"
#include "extensions/Particle3D/PU/CCPUParticleSystem3D.h"

NS_AX_BEGIN

// Constants
const float PUParticle3DInterParticleCollider::DEFAULT_ADJUSTMENT = 1.0f;
const PUParticle3DInterParticleCollider::InterParticleCollisionResponse
    PUParticle3DInterParticleCollider::DEFAULT_COLLISION_RESPONSE =
        PUParticle3DInterParticleCollider::IPCR_AVERAGE_VELOCITY;

//-----------------------------------------------------------------------
PUParticle3DInterParticleCollider::PUParticle3DInterParticleCollider()
    : PUBaseCollider(), _adjustment(DEFAULT_ADJUSTMENT), _interParticleCollisionResponse(DEFAULT_COLLISION_RESPONSE)
{}

PUParticle3DInterParticleCollider::~PUParticle3DInterParticleCollider(void) {}
//-----------------------------------------------------------------------
float PUParticle3DInterParticleCollider::getAdjustment() const
{
    return _adjustment;
}
//-----------------------------------------------------------------------
void PUParticle3DInterParticleCollider::setAdjustment(float adjustment)
{
    _adjustment = adjustment;
}
//-----------------------------------------------------------------------
PUParticle3DInterParticleCollider::InterParticleCollisionResponse
PUParticle3DInterParticleCollider::getInterParticleCollisionResponse() const
{
    return _interParticleCollisionResponse;
}
//-----------------------------------------------------------------------
void PUParticle3DInterParticleCollider::setInterParticleCollisionResponse(
    PUParticle3DInterParticleCollider::InterParticleCollisionResponse interParticleCollisionResponse)
{
    _interParticleCollisionResponse = interParticleCollisionResponse;
}
//-----------------------------------------------------------------------
void PUParticle3DInterParticleCollider::prepare()
{
    // Activate spatial hashing
    // particleTechnique->setSpatialHashingUsed(true);
}
//-----------------------------------------------------------------------
void PUParticle3DInterParticleCollider::unPrepare()
{
    // Deactivate spatial hashing
    // particleTechnique->setSpatialHashingUsed(false);
}
//-----------------------------------------------------------------------
bool PUParticle3DInterParticleCollider::validateAndExecuteSphereCollision(PUParticle3D* particle1,
                                                                          PUParticle3D* particle2,
                                                                          float /*timeElapsed*/)
{
    PUParticle3D* vp1 = static_cast<PUParticle3D*>(particle1);
    PUParticle3D* vp2 = static_cast<PUParticle3D*>(particle2);
    if ((vp1->position - vp2->position).length() < _adjustment * (vp1->radius + vp2->radius))
    {
        /** Collision detected.
        @remarks
            The collision response calculation isn't accurate, but gives an acceptable result.
        */
        Vec3 n = vp1->position - vp2->position;
        n.normalize();
        switch (_interParticleCollisionResponse)
        {
        case IPCR_AVERAGE_VELOCITY:
        {
            // Use average velocity; this keeps the particles in movement.
            float velocity1       = vp1->direction.length();
            float velocity2       = vp2->direction.length();
            float averageVelocity = 0.5f * (velocity1 + velocity2);
            vp1->direction        = averageVelocity * vp2->mass * n;
            vp2->direction        = averageVelocity * vp1->mass * -n;
        }
        break;

        case IPCR_ANGLE_BASED_VELOCITY:
        {
            // The new velocity is based on the angle between original direction and new direction.
            // Note, that this usually means that the velocity decreases.

            float velocity1 =
                Vec3(std::abs(vp1->direction.x), std::abs(vp1->direction.y), std::abs(vp1->direction.z)).dot(n);
            float velocity2 =
                Vec3(std::abs(vp2->direction.x), std::abs(vp2->direction.y), std::abs(vp2->direction.z)).dot(n);
            vp1->direction = velocity1 * vp2->mass * n;
            vp2->direction = velocity2 * vp1->mass * -n;
        }
        break;
        }
        vp1->direction *= _bouncyness;
        vp2->direction *= _bouncyness;
        vp1->addEventFlags(PUParticle3D::PEF_COLLIDED);
        vp2->addEventFlags(PUParticle3D::PEF_COLLIDED);
        return true;
    }

    return false;
}
//-----------------------------------------------------------------------

void PUParticle3DInterParticleCollider::updatePUAffector(PUParticle3D* /*particle*/, float /*deltaTime*/)
{
    // AXASSERT(0, "nonsupport yet");
    // for (auto&& iter : _particleSystem->getParticles())
    //{
    //     PUParticle3D *particle = iter;
    //      Fast rejection: only visible, moving particles are able to collide, unless they are colliding already
    //      Changed && into || in V1.3.1
    //     if (//particle->particleType != Particle::PT_VISUAL ||
    //         particle->hasEventFlags(PUParticle3D::PEF_COLLIDED) ||
    //         particle->direction == Vec3::ZERO)
    //     {
    //         return;
    //     }

    //    // Determine whether neighbour particles are colliding.
    //    SpatialHashTable<Particle*>* hashtable = particleTechnique->getSpatialHashTable();
    //    if (hashtable)
    //    {
    //    	SpatialHashTable<Particle*>::HashTableCell cell = hashtable->getCell(particle->position);
    //    	if (cell.empty())
    //    		return;

    //    	unsigned int size = static_cast<unsigned int>(cell.size());
    //    	for (unsigned int i = 0; i < size; ++i)
    //    	{
    //    		Particle* p = cell[i];

    //    		// Don't check if it is the same particle or the particle is already colliding.
    //    		if (particle != p  && !p->hasEventFlags(PUParticle3D::PEF_COLLIDED))
    //    		{
    //    			// Check for collision
    //    			if (validateAndExecuteSphereCollision(particle, p, deltaTime))
    //    			{
    //    				return;
    //    			}
    //    		}
    //    	}
    //    }
    //}
}

PUParticle3DInterParticleCollider* PUParticle3DInterParticleCollider::create()
{
    auto pipc = new PUParticle3DInterParticleCollider();
    pipc->autorelease();
    return pipc;
}

void PUParticle3DInterParticleCollider::copyAttributesTo(PUAffector* affector)
{
    PUBaseCollider::copyAttributesTo(affector);
    PUParticle3DInterParticleCollider* interParticleCollider =
        static_cast<PUParticle3DInterParticleCollider*>(affector);
    interParticleCollider->_adjustment                     = _adjustment;
    interParticleCollider->_interParticleCollisionResponse = _interParticleCollisionResponse;
}

NS_AX_END