axmol/core/physics3d/CCPhysics3DComponent.cpp

/****************************************************************************
Copyright (c) 2015-2016 Chukong Technologies Inc.
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

https://axis-project.github.io/

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

#include "physics3d/CCPhysics3D.h"
#include "2d/CCNode.h"
#include "2d/CCScene.h"

#if AX_USE_3D_PHYSICS

#    if (AX_ENABLE_BULLET_INTEGRATION)

NS_AX_BEGIN

Physics3DComponent::~Physics3DComponent()
{
    AX_SAFE_RELEASE(_physics3DObj);
}

std::string& Physics3DComponent::getPhysics3DComponentName()
{
    static std::string comName = "___Physics3DComponent___";
    return comName;
}

bool Physics3DComponent::init()
{
    setName(getPhysics3DComponentName());
    return Component::init();
}

Physics3DComponent* Physics3DComponent::create(Physics3DObject* physicsObj,
                                               const axis::Vec3& translateInPhysics,
                                               const axis::Quaternion& rotInPhsyics)
{
    auto ret = new Physics3DComponent();
    if (ret->init())
    {
        ret->setPhysics3DObject(physicsObj);
        ret->setTransformInPhysics(translateInPhysics, rotInPhsyics);
        ret->autorelease();
        return ret;
    }
    AX_SAFE_DELETE(ret);
    return nullptr;
}

void Physics3DComponent::setPhysics3DObject(Physics3DObject* physicsObj)
{
    AX_SAFE_RETAIN(physicsObj);
    AX_SAFE_RELEASE(_physics3DObj);
    _physics3DObj = physicsObj;
}

Physics3DComponent::Physics3DComponent()
    : _physics3DObj(nullptr), _syncFlag(Physics3DComponent::PhysicsSyncFlag::NODE_AND_NODE)
{}

void Physics3DComponent::setEnabled(bool b)
{
    bool oldBool = _enabled;
    Component::setEnabled(b);
    if (_physics3DObj && oldBool != _enabled)
    {
        _enabled ? _physics3DObj->getPhysicsWorld()->addPhysics3DObject(_physics3DObj)
                 : _physics3DObj->getPhysicsWorld()->removePhysics3DObject(_physics3DObj);
    }
}

void Physics3DComponent::addToPhysicsWorld(Physics3DWorld* world)
{
    // add component to physics world
    if (_physics3DObj)
    {
        _physics3DObj->setPhysicsWorld(world);
        world->addPhysics3DObject(_physics3DObj);
        auto& components = world->_physicsComponents;
        auto it          = std::find(components.begin(), components.end(), this);
        if (it == components.end())
        {
            auto parent = _owner->getParent();
            while (parent)
            {
                for (size_t i = 0; i < components.size(); i++)
                {
                    if (parent == components[i]->getOwner())
                    {
                        // insert it here
                        components.insert(components.begin() + i, this);
                        return;
                    }
                }
                parent = parent->getParent();
            }

            components.insert(components.begin(), this);
        }
    }
}

void Physics3DComponent::onEnter()
{
    Component::onEnter();

    if (_physics3DObj->getPhysicsWorld() == nullptr && _owner)
    {
        auto scene = _owner->getScene();
        if (scene)
            addToPhysicsWorld(scene->getPhysics3DWorld());
    }
}

void Physics3DComponent::onExit()
{
    Component::onExit();
    setEnabled(false);

    // remove component from physics world
    if (_physics3DObj)
    {
        auto& components = _physics3DObj->getPhysicsWorld()->_physicsComponents;
        auto it          = std::find(components.begin(), components.end(), this);
        if (it != components.end())
            components.erase(it);
    }
}

void Physics3DComponent::preSimulate()
{
    if (((int)_syncFlag & (int)Physics3DComponent::PhysicsSyncFlag::NODE_TO_PHYSICS) && _physics3DObj && _owner)
    {
        syncNodeToPhysics();
    }
}

void Physics3DComponent::postSimulate()
{
    if (((int)_syncFlag & (int)Physics3DComponent::PhysicsSyncFlag::PHYSICS_TO_NODE) && _physics3DObj && _owner)
    {
        syncPhysicsToNode();
    }
}

void Physics3DComponent::setTransformInPhysics(const axis::Vec3& translateInPhysics,
                                               const axis::Quaternion& rotInPhsyics)
{
    Mat4::createRotation(rotInPhsyics, &_transformInPhysics);
    _transformInPhysics.m[12] = translateInPhysics.x;
    _transformInPhysics.m[13] = translateInPhysics.y;
    _transformInPhysics.m[14] = translateInPhysics.z;

    _invTransformInPhysics = _transformInPhysics.getInversed();
}

void Physics3DComponent::setSyncFlag(PhysicsSyncFlag syncFlag)
{
    _syncFlag = syncFlag;
}

void Physics3DComponent::syncPhysicsToNode()
{
    if (_physics3DObj->getObjType() == Physics3DObject::PhysicsObjType::RIGID_BODY ||
        _physics3DObj->getObjType() == Physics3DObject::PhysicsObjType::COLLIDER)
    {
        Mat4 parentMat;
        if (_owner->getParent())
            parentMat = _owner->getParent()->getNodeToWorldTransform();

        auto mat = parentMat.getInversed() * _physics3DObj->getWorldTransform();
        // remove scale, no scale support for physics
        float oneOverLen = 1.f / sqrtf(mat.m[0] * mat.m[0] + mat.m[1] * mat.m[1] + mat.m[2] * mat.m[2]);
        mat.m[0] *= oneOverLen;
        mat.m[1] *= oneOverLen;
        mat.m[2] *= oneOverLen;
        oneOverLen = 1.f / sqrtf(mat.m[4] * mat.m[4] + mat.m[5] * mat.m[5] + mat.m[6] * mat.m[6]);
        mat.m[4] *= oneOverLen;
        mat.m[5] *= oneOverLen;
        mat.m[6] *= oneOverLen;
        oneOverLen = 1.f / sqrtf(mat.m[8] * mat.m[8] + mat.m[9] * mat.m[9] + mat.m[10] * mat.m[10]);
        mat.m[8] *= oneOverLen;
        mat.m[9] *= oneOverLen;
        mat.m[10] *= oneOverLen;

        mat *= _transformInPhysics;
        static Vec3 scale, translation;
        static Quaternion quat;
        mat.decompose(&scale, &quat, &translation);
        _owner->setPosition3D(translation);
        quat.normalize();
        _owner->setRotationQuat(quat);
    }
}

void Physics3DComponent::syncNodeToPhysics()
{
    if (_physics3DObj->getObjType() == Physics3DObject::PhysicsObjType::RIGID_BODY ||
        _physics3DObj->getObjType() == Physics3DObject::PhysicsObjType::COLLIDER)
    {
        auto mat = _owner->getNodeToWorldTransform();
        // remove scale, no scale support for physics
        float oneOverLen = 1.f / sqrtf(mat.m[0] * mat.m[0] + mat.m[1] * mat.m[1] + mat.m[2] * mat.m[2]);
        mat.m[0] *= oneOverLen;
        mat.m[1] *= oneOverLen;
        mat.m[2] *= oneOverLen;
        oneOverLen = 1.f / sqrtf(mat.m[4] * mat.m[4] + mat.m[5] * mat.m[5] + mat.m[6] * mat.m[6]);
        mat.m[4] *= oneOverLen;
        mat.m[5] *= oneOverLen;
        mat.m[6] *= oneOverLen;
        oneOverLen = 1.f / sqrtf(mat.m[8] * mat.m[8] + mat.m[9] * mat.m[9] + mat.m[10] * mat.m[10]);
        mat.m[8] *= oneOverLen;
        mat.m[9] *= oneOverLen;
        mat.m[10] *= oneOverLen;

        mat *= _invTransformInPhysics;
        if (_physics3DObj->getObjType() == Physics3DObject::PhysicsObjType::RIGID_BODY)
        {
            auto body        = static_cast<Physics3DRigidBody*>(_physics3DObj)->getRigidBody();
            auto motionState = body->getMotionState();
            motionState->setWorldTransform(convertMat4TobtTransform(mat));
            body->setMotionState(motionState);
        }
        else if (_physics3DObj->getObjType() == Physics3DObject::PhysicsObjType::COLLIDER)
        {
            auto object = static_cast<Physics3DCollider*>(_physics3DObj)->getGhostObject();
            object->setWorldTransform(convertMat4TobtTransform(mat));
        }
    }
}

NS_AX_END

#    endif  // AX_ENABLE_BULLET_INTEGRATION

#endif  // AX_USE_3D_PHYSICS