cocos-engine/native/cocos/scene/Node.cpp

/****************************************************************************
 Copyright (c) 2021-2022 Xiamen Yaji Software Co., Ltd.

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#include "scene/Node.h"
#include "scene/Define.h"

namespace cc {
namespace scene {
se::Object *Node::dirtyNodes{nullptr};
void        Node::updateWorldTransform() {
    if (!getDirtyFlag()) {
        return;
    }
    int        i    = 0;
    BaseNode * curr = this;
    Mat3       mat3;
    Mat3       m43;
    Quaternion quat;
    while (curr && curr->getDirtyFlag()) {
        setDirtyNode(i++, reinterpret_cast<Node *>(curr));
        curr = curr->getParent();
    }
    Node *   child{nullptr};
    uint32_t dirtyBits = 0;
    while (i) {
        child = getDirtyNode(--i);
        if (!child) {
            continue;
        }
        dirtyBits |= child->getDirtyFlag();
        auto *childLayout = child->_nodeLayout;
        if (curr) {
            if (dirtyBits & static_cast<uint32_t>(TransformBit::POSITION)) {
                childLayout->worldPosition.transformMat4(childLayout->localPosition, curr->getWorldMatrix());
                childLayout->worldMatrix.m[12] = childLayout->worldPosition.x;
                childLayout->worldMatrix.m[13] = childLayout->worldPosition.y;
                childLayout->worldMatrix.m[14] = childLayout->worldPosition.z;
            }
            if (dirtyBits & static_cast<uint32_t>(TransformBit::RS)) {
                Mat4::fromRTS(childLayout->localRotation, childLayout->localPosition, childLayout->localScale, &childLayout->worldMatrix);
                Mat4::multiply(curr->getWorldMatrix(), childLayout->worldMatrix, &childLayout->worldMatrix);
                if (dirtyBits & static_cast<uint32_t>(TransformBit::ROTATION)) {
                    Quaternion::multiply(curr->getWorldRotation(), childLayout->localRotation, &childLayout->worldRotation);
                }
                quat = childLayout->worldRotation;
                quat.conjugate();
                Mat3::fromQuat(mat3, quat);
                Mat3::fromMat4(m43, childLayout->worldMatrix);
                Mat3::multiply(mat3, mat3, m43);
                childLayout->worldScale.set(mat3.m[0], mat3.m[4], mat3.m[8]);
            }
        } else if (child) {
            if (dirtyBits & static_cast<uint32_t>(TransformBit::POSITION)) {
                childLayout->worldPosition.set(childLayout->localPosition);
                childLayout->worldMatrix.m[12] = childLayout->worldPosition.x;
                childLayout->worldMatrix.m[13] = childLayout->worldPosition.y;
                childLayout->worldMatrix.m[14] = childLayout->worldPosition.z;
            }
            if (dirtyBits & static_cast<uint32_t>(TransformBit::RS)) {
                if (dirtyBits & static_cast<uint32_t>(TransformBit::ROTATION)) {
                    childLayout->worldRotation.set(childLayout->localRotation);
                }
                if (dirtyBits & static_cast<uint32_t>(TransformBit::SCALE)) {
                    childLayout->worldScale.set(childLayout->localScale);
                    Mat4::fromRTS(childLayout->worldRotation, childLayout->worldPosition, childLayout->worldScale, &childLayout->worldMatrix);
                }
            }
        }
        child->setDirtyFlag(static_cast<uint32_t>(TransformBit::NONE));
        curr = child;
    }
}

void Node::updateWorldRTMatrix() {
    updateWorldTransform();
    Mat4::fromRT(_nodeLayout->worldRotation, _nodeLayout->worldPosition, &_rtMat);
}

void Node::invalidateChildren(TransformBit dirtyBit) {
    uint32_t       curDirtyBit{static_cast<uint32_t>(dirtyBit)};
    const uint32_t childDirtyBit{curDirtyBit | static_cast<uint32_t>(TransformBit::POSITION)};
    setDirtyNode(0, this);
    int i{0};
    while (i >= 0) {
        BaseNode *      cur             = getDirtyNode(i--);
        const uint32_t &hasChangedFlags = cur->getFlagsChanged();
        if ((cur->getDirtyFlag() & hasChangedFlags & curDirtyBit) != curDirtyBit) {
            cur->setDirtyFlag(cur->getDirtyFlag() | curDirtyBit);
            cur->setFlagsChanged(hasChangedFlags | curDirtyBit);
            int childCount{static_cast<int>(cur->getChilds().size())};
            for (BaseNode *curChild : cur->getChilds()) {
                setDirtyNode(++i, reinterpret_cast<Node *>(curChild));
            }
        }
        curDirtyBit = childDirtyBit;
    }
}

void Node::setWorldPosition(float x, float y, float z) {
    _nodeLayout->worldPosition.set(x, y, z);
    if (_parent) {
        _parent->updateWorldTransform();
        Mat4 invertWMat{_parent->getWorldMatrix()};
        invertWMat.inverse();
        _nodeLayout->localPosition.transformMat4(_nodeLayout->worldPosition, invertWMat);
    } else {
        _nodeLayout->localPosition.set(_nodeLayout->worldPosition);
    }
    invalidateChildren(TransformBit::POSITION);
}

void Node::setWorldRotation(float x, float y, float z, float w) {
    _nodeLayout->worldRotation.set(x, y, z, w);
    if (_parent) {
        _parent->updateWorldTransform();
        _nodeLayout->localRotation.set(_parent->getWorldRotation().getConjugated());
        _nodeLayout->localRotation.multiply(_nodeLayout->worldRotation);
    } else {
        _nodeLayout->localRotation.set(_nodeLayout->worldRotation);
    }
    invalidateChildren(TransformBit::ROTATION);
}

void Node::setDirtyNode(int idx, Node *node) {
    se::AutoHandleScope autoHandle;
    if (dirtyNodes) {
        se::Value value;
        nativevalue_to_se(node, value, nullptr);
        dirtyNodes->setArrayElement(static_cast<uint32_t>(idx), value);
    }
}

Node *Node::getDirtyNode(const int idx) {
    se::AutoHandleScope autoHandle;
    if (dirtyNodes) {
        se::Value value;
        if (dirtyNodes->getArrayElement(static_cast<uint32_t>(idx), &value)) {
            if (value.isObject()) {
                return reinterpret_cast<cc::scene::Node *>(value.toObject()->getPrivateData());
            }
        }
    }
    return nullptr;
}

void Node::initWithData(uint8_t *data, uint8_t *flagChunk, const se::Value &dirtys) {
    _nodeLayout = reinterpret_cast<NodeLayout *>(data);
    _flagChunk  = reinterpret_cast<uint32_t *>(flagChunk);
    if (dirtyNodes == nullptr) {
        dirtyNodes = dirtys.toObject();
        dirtyNodes->incRef();
        se::ScriptEngine::getInstance()->addBeforeCleanupHook([]() {
            dirtyNodes->decRef();
            dirtyNodes = nullptr;
        });
    }
}

} // namespace scene
} // namespace cc