RedCore/cocos2d/cocos/3d/CCSkeleton3D.cpp

/****************************************************************************
 Copyright (c) 2014-2017 Chukong Technologies Inc.

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#include "3d/CCSkeleton3D.h"


NS_CC_BEGIN

/**
 * Sets the inverse bind pose matrix.
 *
 * @param m C3DMatrix representing the inverse bind pose for this Bone.
 */
void Bone3D::setInverseBindPose(const Mat4& m)
{
    _invBindPose = m;
}

const Mat4& Bone3D::getInverseBindPose()
{
    return _invBindPose;
}

void Bone3D::setOriPose(const Mat4& m)
{
    _oriPose = m;
}

void Bone3D::resetPose()
{
    _local =_oriPose;
    
    for (auto it : _children) {
        it->resetPose();
    }
}

void Bone3D::setWorldMatDirty(bool dirty)
{
    _worldDirty = dirty;
    for (auto it : _children) {
        it->setWorldMatDirty(dirty);
    }
}

//update own world matrix and children's
void Bone3D::updateWorldMat()
{
    getWorldMat();
    for (auto itor : _children) {
        itor->updateWorldMat();
    }
}

const Mat4& Bone3D::getWorldMat()
{
    if (_worldDirty)
    {
        updateLocalMat();
        if (_parent)
        {
            _world = _parent->getWorldMat() * _local;
        }
        else
            _world = _local;
        
        _worldDirty = false;
    }
    
    return _world;
}

void Bone3D::setAnimationValue(float* trans, float* rot, float* scale, void* tag, float weight)
{
    for (auto& it : _blendStates) {
        if (it.tag == tag)
        {
            if (trans)
                it.localTranslate.set(trans);
            if (rot)
                it.localRot.set(rot);
            if (scale)
                it.localScale.set(scale);
            it.weight = weight;
            return;
        }
    }
    BoneBlendState state;
    if (trans)
        state.localTranslate.set(trans);
    if (rot)
        state.localRot.set(rot);
    if (scale)
        state.localScale.set(scale);
    
    state.weight = weight;
    state.tag = tag;
    
    _blendStates.push_back(state);
}

void Bone3D::clearBoneBlendState()
{
    _blendStates.clear();
    for (auto it : _children) {
        it->clearBoneBlendState();
    }
}

/**
 * Creates C3DBone.
 */
Bone3D* Bone3D::create(const std::string& id)
{
    auto bone = new (std::nothrow) Bone3D(id);
    bone->autorelease();
    return bone;
}

void Bone3D::updateJointMatrix(Vec4* matrixPalette)
{
    {
        static Mat4 t;
        Mat4::multiply(_world, getInverseBindPose(), &t);

        matrixPalette[0].set(t.m[0], t.m[4], t.m[8], t.m[12]);
        matrixPalette[1].set(t.m[1], t.m[5], t.m[9], t.m[13]);
        matrixPalette[2].set(t.m[2], t.m[6], t.m[10], t.m[14]);
    }
}

Bone3D* Bone3D::getParentBone()
{
    return _parent;
}
ssize_t Bone3D::getChildBoneCount() const
{
    return _children.size();
}
Bone3D* Bone3D::getChildBoneByIndex(int index) const
{
    return _children.at(index);
}
void Bone3D::addChildBone(Bone3D* bone)
{
    if (_children.find(bone) == _children.end())
       _children.pushBack(bone);
}
void Bone3D::removeChildBoneByIndex(int index)
{
    _children.erase(index);
}
void Bone3D::removeChildBone(Bone3D* bone)
{
    _children.eraseObject(bone);
}
void Bone3D::removeAllChildBone()
{
    _children.clear();
}

Bone3D::Bone3D(const std::string& id)
: _name(id)
, _parent(nullptr)
, _worldDirty(true)
{
    
}

Bone3D::~Bone3D()
{
    removeAllChildBone();
}

void Bone3D::updateLocalMat()
{
    if (_blendStates.size())
    {
        Vec3 translate, scale;
        Quaternion quat(Quaternion::ZERO);
        
        float total = 0.f;
        for (auto it: _blendStates) {
            total += it.weight;
        }
        if (total)
        {
            if (_blendStates.size() == 1)
            {
                auto& state = _blendStates[0];
                translate = state.localTranslate;
                scale = state.localScale;
                quat = state.localRot;
            }
            else
            {
                float invTotal = 1.f / total;
                for (const auto& it : _blendStates)
                {
                    float weight = (it.weight * invTotal);
                    translate += it.localTranslate * weight;
                    scale.x += it.localScale.x * weight;
                    scale.y += it.localScale.y * weight;
                    scale.z += it.localScale.z * weight;
                    if (!quat.isZero())
                    {
                        Quaternion& q = _blendStates[0].localRot;
                        if (q.x * quat.x + q.y * quat.y + q.z * quat.z + q.w * quat.w < 0)
                            weight = -weight;
                    }
                    quat = Quaternion(it.localRot.x * weight + quat.x, it.localRot.y * weight + quat.y, it.localRot.z * weight + quat.z, it.localRot.w * weight + quat.w);
                }
                quat.normalize();
            }
        }
        
        Mat4::createTranslation(translate, &_local);
        _local.rotate(quat);
        _local.scale(scale);
        
        _blendStates.clear();
    }
}

////////////////////////////////////////////////////////////////////////////////////////////////////////////////

Skeleton3D::Skeleton3D()
{
    
}

Skeleton3D::~Skeleton3D()
{
    removeAllBones();
}

Skeleton3D* Skeleton3D::create(const std::vector<NodeData*>& skeletondata)
{
    auto skeleton = new (std::nothrow) Skeleton3D();
    for (const auto& it : skeletondata) {
        auto bone = skeleton->createBone3D(*it);
        bone->resetPose();
        skeleton->_rootBones.pushBack(bone);
    }
    skeleton->autorelease();
    return skeleton;
}

ssize_t Skeleton3D::getBoneCount() const
{
    return _bones.size();
}

//get bone
Bone3D* Skeleton3D::getBoneByIndex(unsigned int index) const
{
    if (index < static_cast<unsigned int>(_bones.size()))
        return _bones.at(index);
    
    return nullptr;
}
Bone3D* Skeleton3D::getBoneByName(const std::string& id) const
{
    //search from bones
    for (auto it : _bones) {
        if (it->getName() == id)
            return it;
    }
    
    return nullptr;
}

ssize_t Skeleton3D::getRootCount() const
{
    return _rootBones.size();
}

Bone3D* Skeleton3D::getRootBone(int index) const
{
    return _rootBones.at(index);
}

int Skeleton3D::getBoneIndex(Bone3D* bone) const
{
    for (ssize_t i = 0, size = _bones.size(); i < size; ++i) {
        if (_bones.at(i) == bone)
            return static_cast<int>(i);
    }

    return -1;
}

//refresh bone world matrix
void Skeleton3D::updateBoneMatrix()
{
    for (const auto& it : _rootBones) {
        it->setWorldMatDirty(true);
        it->updateWorldMat();
    }
}

void Skeleton3D::removeAllBones()
{
    _bones.clear();
    _rootBones.clear();
}

void Skeleton3D::addBone(Bone3D* bone)
{
    _bones.pushBack(bone);
}

Bone3D* Skeleton3D::createBone3D(const NodeData& nodedata)
{
    auto bone = Bone3D::create(nodedata.id);
    for (const auto& it : nodedata.children) {
        auto child = createBone3D(*it);
        bone->addChildBone(child);
        child->_parent = bone;
    }
    _bones.pushBack(bone);
    bone->_oriPose = nodedata.transform;
    return bone;
}

NS_CC_END