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

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#include "scene/SkinningModel.h"
#include <utility>
#include "scene/RenderScene.h"

namespace cc {
namespace scene {

std::vector<JointTransform*> SkinningModel::transStacks;

void SkinningModel::updateWorldMatrix(JointInfo* info, uint32_t stamp) {
    transStacks.clear();

    int i = -1;
    _worldMatrix.setIdentity();
    auto* currTransform = &info->transform;
    auto  parentSize    = static_cast<int>(info->parents.size());
    while (currTransform->node) {
        if ((currTransform->stamp == stamp || currTransform->stamp + 1 == stamp) && !currTransform->node->getFlagsChanged()) {
            _worldMatrix.set(currTransform->world);
            currTransform->stamp = stamp;
            break;
        }
        currTransform->stamp = stamp;
        transStacks.emplace_back(currTransform);
        i++;
        if (i >= parentSize) {
            break;
        }
        currTransform = &info->parents[i];
    }
    while (i > -1) {
        currTransform = transStacks[i--];
        auto* node    = currTransform->node;
        Mat4::fromRTS(node->getRotation(), node->getPosition(), node->getScale(), &currTransform->local);
        Mat4::multiply(_worldMatrix, currTransform->local, &currTransform->world);
        _worldMatrix.set(currTransform->world);
    }
}

void SkinningModel::updateUBOs(uint32_t stamp) {
    Model::updateUBOs(stamp);
    uint32_t bIdx = 0;
    Mat4     mat4;
    for (const JointInfo& jointInfo : _joints) {
        Mat4::multiply(jointInfo.transform.world, jointInfo.bindpose, &mat4);
        for (uint32_t buffer : jointInfo.buffers) {
            uploadJointData(jointInfo.indices[bIdx] * 12, mat4, _dataArray[buffer]->data());
            bIdx++;
        }
        bIdx = 0;
    }
    bIdx = 0;
    for (gfx::Buffer* buffer : _buffers) {
        buffer->update(_dataArray[bIdx]->data(), buffer->getSize());
        bIdx++;
    }
}

void SkinningModel::uploadJointData(uint32_t base, const Mat4& mat, float* dst) {
    memcpy(reinterpret_cast<void*>(dst + base), mat.m, sizeof(float) * 12);
    dst[base + 3]  = mat.m[12];
    dst[base + 7]  = mat.m[13];
    dst[base + 11] = mat.m[14];
}

SkinningModel::~SkinningModel() {
    for (auto* curr : _dataArray) {
        delete curr;
    }
}

void SkinningModel::setBuffers(std::vector<gfx::Buffer*> buffers) {
    _buffers = std::move(buffers);
    for (auto* buffer : _buffers) {
        auto* data = new std::array<float, pipeline::UBOSkinning::COUNT>();
        _dataArray.push_back(data);
    }
}

void SkinningModel::updateTransform(uint32_t stamp) {
    auto* root = getTransform();
    if (root->getFlagsChanged() || root->getDirtyFlag()) {
        root->updateWorldTransform();
        _transformUpdated = true;
    }
    Vec3 v3Min{INFINITY, INFINITY, INFINITY};
    Vec3 v3Max{-INFINITY, -INFINITY, -INFINITY};
    AABB ab1;
    Vec3 v31;
    Vec3 v32;
    for (JointInfo& jointInfo : _joints) {
        updateWorldMatrix(&jointInfo, stamp);
        jointInfo.bound->transform(_worldMatrix, &ab1);
        ab1.getBoundary(&v31, &v32);
        Vec3::min(v3Min, v31, &v3Min);
        Vec3::max(v3Max, v32, &v3Max);
    }
    if (_modelBounds.getValid() && _worldBounds) {
        AABB::fromPoints(v3Min, v3Max, &_modelBounds);
        _modelBounds.transform(root->getNodeLayout()->worldMatrix, _worldBounds);
    }

    if (_scene) {
        _scene->updateOctree(this);
    }
}
} // namespace scene
} // namespace cc