axmol/core/physics/PhysicsContact.cpp

/****************************************************************************
 Copyright (c) 2013-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

 https://axmolengine.github.io/

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 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

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#include "physics/PhysicsContact.h"
#if AX_USE_PHYSICS
#    include "chipmunk/chipmunk.h"

#    include "physics/PhysicsBody.h"
#    include "physics/PhysicsHelper.h"
#    include "base/EventCustom.h"

NS_AX_BEGIN

const char* PHYSICSCONTACT_EVENT_NAME = "PhysicsContactEvent";

PhysicsContact::PhysicsContact()
    : EventCustom(PHYSICSCONTACT_EVENT_NAME)
    , _world(nullptr)
    , _shapeA(nullptr)
    , _shapeB(nullptr)
    , _eventCode(EventCode::NONE)
    , _notificationEnable(true)
    , _result(true)
    , _data(nullptr)
    , _contactInfo(nullptr)
    , _contactData(nullptr)
    , _preContactData(nullptr)
{}

PhysicsContact::~PhysicsContact()
{
    AX_SAFE_DELETE(_contactData);
    AX_SAFE_DELETE(_preContactData);
}

PhysicsContact* PhysicsContact::construct(PhysicsShape* a, PhysicsShape* b)
{
    PhysicsContact* contact = new PhysicsContact();
    if (contact->init(a, b))
    {
        return contact;
    }

    AX_SAFE_DELETE(contact);
    return nullptr;
}

bool PhysicsContact::init(PhysicsShape* a, PhysicsShape* b)
{
    do
    {
        AX_BREAK_IF(a == nullptr || b == nullptr);

        _shapeA = a;
        _shapeB = b;

        return true;
    } while (false);

    return false;
}

void PhysicsContact::generateContactData()
{
    if (_contactInfo == nullptr)
    {
        return;
    }

    cpArbiter* arb = static_cast<cpArbiter*>(_contactInfo);
    AX_SAFE_DELETE(_preContactData);
    _preContactData     = _contactData;
    _contactData        = new PhysicsContactData();
    _contactData->count = cpArbiterGetCount(arb);
    for (int i = 0; i < _contactData->count && i < PhysicsContactData::POINT_MAX; ++i)
    {
        _contactData->points[i] = PhysicsHelper::cpv2vec2(cpArbiterGetPointA(arb, i));
    }

    _contactData->normal = _contactData->count > 0 ? PhysicsHelper::cpv2vec2(cpArbiterGetNormal(arb)) : Vec2::ZERO;
}

// PhysicsContactPreSolve implementation
PhysicsContactPreSolve::PhysicsContactPreSolve(void* contactInfo) : _contactInfo(contactInfo) {}

PhysicsContactPreSolve::~PhysicsContactPreSolve() {}

float PhysicsContactPreSolve::getRestitution() const
{
    return cpArbiterGetRestitution(static_cast<cpArbiter*>(_contactInfo));
}

float PhysicsContactPreSolve::getFriction() const
{
    return cpArbiterGetFriction(static_cast<cpArbiter*>(_contactInfo));
}

Vec2 PhysicsContactPreSolve::getSurfaceVelocity() const
{
    return PhysicsHelper::cpv2vec2(cpArbiterGetSurfaceVelocity(static_cast<cpArbiter*>(_contactInfo)));
}

void PhysicsContactPreSolve::setRestitution(float restitution)
{
    cpArbiterSetRestitution(static_cast<cpArbiter*>(_contactInfo), restitution);
}

void PhysicsContactPreSolve::setFriction(float friction)
{
    cpArbiterSetFriction(static_cast<cpArbiter*>(_contactInfo), friction);
}

void PhysicsContactPreSolve::setSurfaceVelocity(const Vec2& velocity)
{
    cpArbiterSetSurfaceVelocity(static_cast<cpArbiter*>(_contactInfo), PhysicsHelper::vec22cpv(velocity));
}

void PhysicsContactPreSolve::ignore()
{
    cpArbiterIgnore(static_cast<cpArbiter*>(_contactInfo));
}

// PhysicsContactPostSolve implementation
PhysicsContactPostSolve::PhysicsContactPostSolve(void* contactInfo) : _contactInfo(contactInfo) {}

PhysicsContactPostSolve::~PhysicsContactPostSolve() {}

float PhysicsContactPostSolve::getRestitution() const
{
    return cpArbiterGetRestitution(static_cast<cpArbiter*>(_contactInfo));
}

float PhysicsContactPostSolve::getFriction() const
{
    return cpArbiterGetFriction(static_cast<cpArbiter*>(_contactInfo));
}

Vec2 PhysicsContactPostSolve::getSurfaceVelocity() const
{
    return PhysicsHelper::cpv2vec2(cpArbiterGetSurfaceVelocity(static_cast<cpArbiter*>(_contactInfo)));
}

EventListenerPhysicsContact::EventListenerPhysicsContact()
    : onContactBegin(nullptr), onContactPreSolve(nullptr), onContactPostSolve(nullptr), onContactSeparate(nullptr)
{}

bool EventListenerPhysicsContact::init()
{
    auto func = [this](EventCustom* event) -> void { onEvent(event); };

    return EventListenerCustom::init(PHYSICSCONTACT_EVENT_NAME, func);
}

void EventListenerPhysicsContact::onEvent(EventCustom* event)
{
    PhysicsContact* contact = dynamic_cast<PhysicsContact*>(event);

    if (contact == nullptr)
    {
        return;
    }

    switch (contact->getEventCode())
    {
    case PhysicsContact::EventCode::BEGIN:
    {
        bool ret = true;

        if (onContactBegin != nullptr && hitTest(contact->getShapeA(), contact->getShapeB()))
        {
            contact->generateContactData();
            ret = onContactBegin(*contact);
        }

        contact->setResult(ret);
        break;
    }
    case PhysicsContact::EventCode::PRESOLVE:
    {
        bool ret = true;

        if (onContactPreSolve != nullptr && hitTest(contact->getShapeA(), contact->getShapeB()))
        {
            PhysicsContactPreSolve solve(contact->_contactInfo);
            contact->generateContactData();

            ret = onContactPreSolve(*contact, solve);
        }

        contact->setResult(ret);
        break;
    }
    case PhysicsContact::EventCode::POSTSOLVE:
    {
        if (onContactPostSolve != nullptr && hitTest(contact->getShapeA(), contact->getShapeB()))
        {
            PhysicsContactPostSolve solve(contact->_contactInfo);
            onContactPostSolve(*contact, solve);
        }
        break;
    }
    case PhysicsContact::EventCode::SEPARATE:
    {
        if (onContactSeparate != nullptr && hitTest(contact->getShapeA(), contact->getShapeB()))
        {
            onContactSeparate(*contact);
        }
        break;
    }
    default:
        break;
    }
}

EventListenerPhysicsContact::~EventListenerPhysicsContact() {}

EventListenerPhysicsContact* EventListenerPhysicsContact::create()
{
    EventListenerPhysicsContact* obj = new EventListenerPhysicsContact();

    if (obj->init())
    {
        obj->autorelease();
        return obj;
    }

    AX_SAFE_DELETE(obj);
    return nullptr;
}

bool EventListenerPhysicsContact::hitTest(PhysicsShape* /*shapeA*/, PhysicsShape* /*shapeB*/)
{
    return true;
}

bool EventListenerPhysicsContact::checkAvailable()
{
    if (onContactBegin == nullptr && onContactPreSolve == nullptr && onContactPostSolve == nullptr &&
        onContactSeparate == nullptr)
    {
        AXASSERT(false, "Invalid PhysicsContactListener.");
        return false;
    }

    return true;
}

EventListenerPhysicsContact* EventListenerPhysicsContact::clone()
{
    EventListenerPhysicsContact* obj = EventListenerPhysicsContact::create();

    if (obj != nullptr)
    {
        obj->onContactBegin     = onContactBegin;
        obj->onContactPreSolve  = onContactPreSolve;
        obj->onContactPostSolve = onContactPostSolve;
        obj->onContactSeparate  = onContactSeparate;

        return obj;
    }

    AX_SAFE_DELETE(obj);
    return nullptr;
}

EventListenerPhysicsContactWithBodies* EventListenerPhysicsContactWithBodies::create(PhysicsBody* bodyA,
                                                                                     PhysicsBody* bodyB)
{
    EventListenerPhysicsContactWithBodies* obj = new EventListenerPhysicsContactWithBodies();

    if (obj->init())
    {
        obj->_a = bodyA;
        obj->_b = bodyB;
        obj->autorelease();
        return obj;
    }

    AX_SAFE_DELETE(obj);
    return nullptr;
}

EventListenerPhysicsContactWithBodies::EventListenerPhysicsContactWithBodies() : _a(nullptr), _b(nullptr) {}

EventListenerPhysicsContactWithBodies::~EventListenerPhysicsContactWithBodies() {}

bool EventListenerPhysicsContactWithBodies::hitTest(PhysicsShape* shapeA, PhysicsShape* shapeB)
{
    if ((shapeA->getBody() == _a && shapeB->getBody() == _b) || (shapeA->getBody() == _b && shapeB->getBody() == _a))
    {
        return true;
    }

    return false;
}

EventListenerPhysicsContactWithBodies* EventListenerPhysicsContactWithBodies::clone()
{
    EventListenerPhysicsContactWithBodies* obj = EventListenerPhysicsContactWithBodies::create(_a, _b);

    if (obj != nullptr)
    {
        obj->onContactBegin     = onContactBegin;
        obj->onContactPreSolve  = onContactPreSolve;
        obj->onContactPostSolve = onContactPostSolve;
        obj->onContactSeparate  = onContactSeparate;

        return obj;
    }

    AX_SAFE_DELETE(obj);
    return nullptr;
}

EventListenerPhysicsContactWithShapes::EventListenerPhysicsContactWithShapes() : _a(nullptr), _b(nullptr) {}

EventListenerPhysicsContactWithShapes::~EventListenerPhysicsContactWithShapes() {}

EventListenerPhysicsContactWithShapes* EventListenerPhysicsContactWithShapes::create(PhysicsShape* shapeA,
                                                                                     PhysicsShape* shapeB)
{
    EventListenerPhysicsContactWithShapes* obj = new EventListenerPhysicsContactWithShapes();

    if (obj->init())
    {
        obj->_a = shapeA;
        obj->_b = shapeB;
        obj->autorelease();
        return obj;
    }

    AX_SAFE_DELETE(obj);
    return nullptr;
}

bool EventListenerPhysicsContactWithShapes::hitTest(PhysicsShape* shapeA, PhysicsShape* shapeB)
{
    if ((shapeA == _a && shapeB == _b) || (shapeA == _b && shapeB == _a))
    {
        return true;
    }

    return false;
}

EventListenerPhysicsContactWithShapes* EventListenerPhysicsContactWithShapes::clone()
{
    EventListenerPhysicsContactWithShapes* obj = EventListenerPhysicsContactWithShapes::create(_a, _b);

    if (obj != nullptr)
    {
        obj->onContactBegin     = onContactBegin;
        obj->onContactPreSolve  = onContactPreSolve;
        obj->onContactPostSolve = onContactPostSolve;
        obj->onContactSeparate  = onContactSeparate;

        return obj;
    }

    AX_SAFE_DELETE(obj);
    return nullptr;
}

EventListenerPhysicsContactWithGroup::EventListenerPhysicsContactWithGroup() : _group(CP_NO_GROUP) {}

EventListenerPhysicsContactWithGroup::~EventListenerPhysicsContactWithGroup() {}

EventListenerPhysicsContactWithGroup* EventListenerPhysicsContactWithGroup::create(int group)
{
    EventListenerPhysicsContactWithGroup* obj = new EventListenerPhysicsContactWithGroup();

    if (obj->init())
    {
        obj->_group = group;
        obj->autorelease();
        return obj;
    }

    AX_SAFE_DELETE(obj);
    return nullptr;
}

bool EventListenerPhysicsContactWithGroup::hitTest(PhysicsShape* shapeA, PhysicsShape* shapeB)
{
    if (shapeA->getGroup() == _group || shapeB->getGroup() == _group)
    {
        return true;
    }

    return false;
}

EventListenerPhysicsContactWithGroup* EventListenerPhysicsContactWithGroup::clone()
{
    EventListenerPhysicsContactWithGroup* obj = EventListenerPhysicsContactWithGroup::create(_group);

    if (obj != nullptr)
    {
        obj->onContactBegin     = onContactBegin;
        obj->onContactPreSolve  = onContactPreSolve;
        obj->onContactPostSolve = onContactPostSolve;
        obj->onContactSeparate  = onContactSeparate;

        return obj;
    }

    AX_SAFE_DELETE(obj);
    return nullptr;
}

NS_AX_END
#endif  // AX_USE_PHYSICS