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

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#include "scene/Model.h"
#include "renderer/pipeline/Define.h"
#include "renderer/pipeline/RenderPipeline.h"
#include "scene/RenderScene.h"
#include "scene/SubModel.h"

namespace cc {
namespace scene {
void Model::uploadMat4AsVec4x3(const Mat4 &mat, float *v1, float *v2, float *v3) {
    uint size = sizeof(float) * 4;
    memcpy(v1, mat.m, size);
    memcpy(v2, mat.m + 4, size);
    memcpy(v3, mat.m + 8, size);
    v1[3] = mat.m[12];
    v2[3] = mat.m[13];
    v3[3] = mat.m[14];
}

void Model::updateTransform(uint32_t /*stamp*/) {
    Node *node = _transform;
    if (node->getFlagsChanged() || node->getDirtyFlag()) {
        node->updateWorldTransform();
        _transformUpdated = true;
        if (_modelBounds.getValid() && _worldBounds) {
            _modelBounds.transform(node->getWorldMatrix(), _worldBounds);
        }

        if (_scene) {
            _scene->updateOctree(this);
        }
    }
}

void Model::updateUBOs(uint32_t stamp) {
    for (SubModel *subModel : _subModels) {
        subModel->update();
    }
    _updateStamp = stamp;
    if (!_transformUpdated) {
        return;
    }
    _transformUpdated = false;
    getTransform()->updateWorldTransform();
    const auto &                                 worldMatrix = getTransform()->getWorldMatrix();
    int                                          idx         = _instMatWorldIdx;
    Mat4                                         mat4;
    std::array<float, pipeline::UBOLocal::COUNT> bufferView;
    if (idx >= 0) {
        const std::vector<uint8_t *> &attrs = getInstancedAttributeBlock()->views;
        uploadMat4AsVec4x3(worldMatrix,
                           reinterpret_cast<float *>(attrs[idx]),
                           reinterpret_cast<float *>(attrs[idx + 1]),
                           reinterpret_cast<float *>(attrs[idx + 2]));
    } else if (_localBuffer) {
        memcpy(bufferView.data() + pipeline::UBOLocal::MAT_WORLD_OFFSET, worldMatrix.m, sizeof(Mat4));
        Mat4::inverseTranspose(worldMatrix, &mat4);
        memcpy(bufferView.data() + pipeline::UBOLocal::MAT_WORLD_IT_OFFSET, mat4.m, sizeof(Mat4));
        const float lightmapUVParam[4] = {_lightmapSettings._lightmapUVParam.x, _lightmapSettings._lightmapUVParam.y,
                                          _lightmapSettings._lightmapUVParam.z, _lightmapSettings._lightmapUVParam.w};
        memcpy(bufferView.data() + pipeline::UBOLocal::LIGHTINGMAP_UVPARAM, lightmapUVParam, sizeof(lightmapUVParam));
        const float localShadowBias[4] = {_shadowBias, _shadowNormalBias, 0.0F, 0.0F};
        memcpy(bufferView.data() + pipeline::UBOLocal::LOCAL_SHADOW_BIAS, &localShadowBias, sizeof(localShadowBias));
        _localBuffer->update(bufferView.data(), pipeline::UBOLocal::SIZE);

        const bool enableOcclusionQuery = pipeline::RenderPipeline::getInstance()->getOcclusionQueryEnabled();
        if (enableOcclusionQuery) {
            updateWorldBoundUBOs();
        }
    }
}

void Model::updateLightingmap(const Vec4 &lightmapUVParam, gfx::Sampler *sampler, gfx::Texture *lightmap) {
    _lightmapSettings._lightmapUVParam = lightmapUVParam;
    _lightmapSettings._sampler         = sampler;
    _lightmapSettings._lightmap        = lightmap;
    for (const SubModel *subModel : _subModels) {
        if (sampler && lightmap) {
            gfx::DescriptorSet *descriptorSet = subModel->getDescriptorSet();
            descriptorSet->bindSampler(pipeline::LIGHTMAPTEXTURE::BINDING, sampler);
            descriptorSet->bindTexture(pipeline::LIGHTMAPTEXTURE::BINDING, lightmap);
            descriptorSet->update();
        }
    }
}

void Model::updateWorldBoundUBOs() {
    if (_worldBoundBuffer) {
        std::array<float, pipeline::UBOWorldBound::COUNT> worldBoundBufferView;
        const Vec3 &                                      center      = _worldBounds ? _worldBounds->getCenter() : Vec3{0.0F, 0.0F, 0.0F};
        const Vec3 &                                      halfExtents = _worldBounds ? _worldBounds->getHalfExtents() : Vec3{1.0F, 1.0F, 1.0F};
        const Vec4                                        worldBoundCenter{center.x, center.y, center.z, 0.0F};
        const Vec4                                        worldBoundHalfExtents{halfExtents.x, halfExtents.y, halfExtents.z, 1.0F};
        memcpy(worldBoundBufferView.data() + pipeline::UBOWorldBound::WORLD_BOUND_CENTER, &worldBoundCenter.x, sizeof(Vec4));
        memcpy(worldBoundBufferView.data() + pipeline::UBOWorldBound::WORLD_BOUND_HALF_EXTENTS, &worldBoundHalfExtents.x, sizeof(Vec4));
        _worldBoundBuffer->update(worldBoundBufferView.data(), pipeline::UBOWorldBound::SIZE);
    }
}

void Model::setSubModel(uint32_t idx, SubModel *subModel) {
    subModel->setOwner(this);
    if (idx >= static_cast<uint32_t>(_subModels.size())) {
        _subModels.emplace_back(subModel);
        return;
    }
    _subModels[idx] = subModel;
}

} // namespace scene
} // namespace cc