assimp/code/AssetLib/3MF/XmlSerializer.cpp

/*
Open Asset Import Library (assimp)
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  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
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  following disclaimer in the documentation and/or other
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  contributors may be used to endorse or promote products
  derived from this software without specific prior
  written permission of the assimp team.

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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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*/
#include "XmlSerializer.h"
#include "D3MFOpcPackage.h"
#include "3MFXmlTags.h"
#include "3MFTypes.h"
#include <assimp/scene.h>

namespace Assimp {
namespace D3MF {

static const int IdNotSet = -1;

namespace {

static const size_t ColRGBA_Len = 9;
static const size_t ColRGB_Len = 7;

// format of the color string: #RRGGBBAA or #RRGGBB (3MF Core chapter 5.1.1)
bool validateColorString(const char *color) {
    const size_t len = strlen(color);
    if (ColRGBA_Len != len && ColRGB_Len != len) {
        return false;
    }

    return true;
}

aiFace ReadTriangle(XmlNode &node) {
    aiFace face;

    face.mNumIndices = 3;
    face.mIndices = new unsigned int[face.mNumIndices];
    face.mIndices[0] = static_cast<unsigned int>(std::atoi(node.attribute(XmlTag::v1).as_string()));
    face.mIndices[1] = static_cast<unsigned int>(std::atoi(node.attribute(XmlTag::v2).as_string()));
    face.mIndices[2] = static_cast<unsigned int>(std::atoi(node.attribute(XmlTag::v3).as_string()));

    return face;
}

aiVector3D ReadVertex(XmlNode &node) {
    aiVector3D vertex;
    vertex.x = ai_strtof(node.attribute(XmlTag::x).as_string(), nullptr);
    vertex.y = ai_strtof(node.attribute(XmlTag::y).as_string(), nullptr);
    vertex.z = ai_strtof(node.attribute(XmlTag::z).as_string(), nullptr);

    return vertex;
}

bool getNodeAttribute(const XmlNode &node, const std::string &attribute, std::string &value) {
    pugi::xml_attribute objectAttribute = node.attribute(attribute.c_str());
    if (!objectAttribute.empty()) {
        value = objectAttribute.as_string();
        return true;
    }

    return false;
}

bool getNodeAttribute(const XmlNode &node, const std::string &attribute, int &value) {
    std::string strValue;
    const bool ret = getNodeAttribute(node, attribute, strValue);
    if (ret) {
        value = std::atoi(strValue.c_str());
        return true;
    }

    return false;
}

aiMatrix4x4 parseTransformMatrix(std::string matrixStr) {
    // split the string
    std::vector<float> numbers;
    std::string currentNumber;
    for (char c : matrixStr) {
        if (c == ' ') {
            if (!currentNumber.empty()) {
                float f = std::stof(currentNumber);
                numbers.push_back(f);
                currentNumber.clear();
            }
        } else {
            currentNumber.push_back(c);
        }
    }
    if (!currentNumber.empty()) {
        const float f = std::stof(currentNumber);
        numbers.push_back(f);
    }

    aiMatrix4x4 transformMatrix;
    transformMatrix.a1 = numbers[0];
    transformMatrix.b1 = numbers[1];
    transformMatrix.c1 = numbers[2];
    transformMatrix.d1 = 0;

    transformMatrix.a2 = numbers[3];
    transformMatrix.b2 = numbers[4];
    transformMatrix.c2 = numbers[5];
    transformMatrix.d2 = 0;

    transformMatrix.a3 = numbers[6];
    transformMatrix.b3 = numbers[7];
    transformMatrix.c3 = numbers[8];
    transformMatrix.d3 = 0;

    transformMatrix.a4 = numbers[9];
    transformMatrix.b4 = numbers[10];
    transformMatrix.c4 = numbers[11];
    transformMatrix.d4 = 1;

    return transformMatrix;
}

bool parseColor(const char *color, aiColor4D &diffuse) {
    if (nullptr == color) {
        return false;
    }

    if (!validateColorString(color)) {
        return false;
    }

    if ('#' != color[0]) {
        return false;
    }

    char r[3] = { color[1], color[2], '\0' };
    diffuse.r = static_cast<ai_real>(strtol(r, nullptr, 16)) / ai_real(255.0);

    char g[3] = { color[3], color[4], '\0' };
    diffuse.g = static_cast<ai_real>(strtol(g, nullptr, 16)) / ai_real(255.0);

    char b[3] = { color[5], color[6], '\0' };
    diffuse.b = static_cast<ai_real>(strtol(b, nullptr, 16)) / ai_real(255.0);
    const size_t len = strlen(color);
    if (ColRGB_Len == len) {
        return true;
    }

    char a[3] = { color[7], color[8], '\0' };
    diffuse.a = static_cast<ai_real>(strtol(a, nullptr, 16)) / ai_real(255.0);

    return true;
}

void assignDiffuseColor(XmlNode &node, aiMaterial *mat) {
    const char *color = node.attribute(XmlTag::basematerials_displaycolor).as_string();
    aiColor4D diffuse;
    if (parseColor(color, diffuse)) {
        mat->AddProperty<aiColor4D>(&diffuse, 1, AI_MATKEY_COLOR_DIFFUSE);
    }
}

} // namespace

XmlSerializer::XmlSerializer(XmlParser *xmlParser) :
        mResourcesDictionnary(),
        mMeshCount(0),
        mXmlParser(xmlParser) {
    ai_assert(nullptr != xmlParser);
}

XmlSerializer::~XmlSerializer() {
    for (auto &it : mResourcesDictionnary) {
        delete it.second;
    }
}

void XmlSerializer::ImportXml(aiScene *scene) {
    if (nullptr == scene) {
        return;
    }
    
    scene->mRootNode = new aiNode(XmlTag::RootTag);
    XmlNode node = mXmlParser->getRootNode().child(XmlTag::model);
    if (node.empty()) {
        return;
    }

    XmlNode resNode = node.child(XmlTag::resources);
    for (auto &currentNode : resNode.children()) {
        const std::string currentNodeName = currentNode.name();
        if (currentNodeName == XmlTag::texture_2d) {
            ReadEmbeddecTexture(currentNode);
        } else if (currentNodeName == XmlTag::texture_group) {
            ReadTextureGroup(currentNode);
        } else if (currentNodeName == XmlTag::object) {
            ReadObject(currentNode);
        } else if (currentNodeName == XmlTag::basematerials) {
            ReadBaseMaterials(currentNode);
        } else if (currentNodeName == XmlTag::meta) {
            ReadMetadata(currentNode);
        }
    }
    StoreMaterialsInScene(scene);
    XmlNode buildNode = node.child(XmlTag::build);
    if (buildNode.empty()) {
        return;
    }

    for (auto &currentNode : buildNode.children()) {
        const std::string currentNodeName = currentNode.name();
        if (currentNodeName == XmlTag::item) {
            int objectId = IdNotSet;
            std::string transformationMatrixStr;
            aiMatrix4x4 transformationMatrix;
            getNodeAttribute(currentNode, D3MF::XmlTag::objectid, objectId);
            bool hasTransform = getNodeAttribute(currentNode, D3MF::XmlTag::transform, transformationMatrixStr);

            auto it = mResourcesDictionnary.find(objectId);
            if (it != mResourcesDictionnary.end() && it->second->getType() == ResourceType::RT_Object) {
                Object *obj = static_cast<Object *>(it->second);
                if (hasTransform) {
                    transformationMatrix = parseTransformMatrix(transformationMatrixStr);
                }

                addObjectToNode(scene->mRootNode, obj, transformationMatrix);
            }
        }
    }

    // import the metadata
    if (!mMetaData.empty()) {
        const size_t numMeta = mMetaData.size();
        scene->mMetaData = aiMetadata::Alloc(static_cast<unsigned int>(numMeta));
        for (size_t i = 0; i < numMeta; ++i) {
            aiString val(mMetaData[i].value);
            scene->mMetaData->Set(static_cast<unsigned int>(i), mMetaData[i].name, val);
        }
    }

    // import the meshes, materials are already stored
    scene->mNumMeshes = static_cast<unsigned int>(mMeshCount);
    if (scene->mNumMeshes != 0) {
        scene->mMeshes = new aiMesh *[scene->mNumMeshes]();
        for (auto &it : mResourcesDictionnary) {
            if (it.second->getType() == ResourceType::RT_Object) {
                Object *obj = static_cast<Object *>(it.second);
                ai_assert(nullptr != obj);
                for (unsigned int i = 0; i < obj->mMeshes.size(); ++i) {
                    scene->mMeshes[obj->mMeshIndex[i]] = obj->mMeshes[i];
                }
            }
        }
    }
}

void XmlSerializer::addObjectToNode(aiNode *parent, Object *obj, aiMatrix4x4 nodeTransform) {
    ai_assert(nullptr != obj);

    aiNode *sceneNode = new aiNode(obj->mName);
    sceneNode->mNumMeshes = static_cast<unsigned int>(obj->mMeshes.size());
    sceneNode->mMeshes = new unsigned int[sceneNode->mNumMeshes];
    std::copy(obj->mMeshIndex.begin(), obj->mMeshIndex.end(), sceneNode->mMeshes);

    sceneNode->mTransformation = nodeTransform;
    if (nullptr != parent) {
        parent->addChildren(1, &sceneNode);
    }

    for (Assimp::D3MF::Component c : obj->mComponents) {
        auto it = mResourcesDictionnary.find(c.mObjectId);
        if (it != mResourcesDictionnary.end() && it->second->getType() == ResourceType::RT_Object) {
            addObjectToNode(sceneNode, static_cast<Object *>(it->second), c.mTransformation);
        }
    }
}

void XmlSerializer::ReadObject(XmlNode &node) {
    int id = IdNotSet, pid = IdNotSet, pindex = IdNotSet;
    bool hasId = getNodeAttribute(node, XmlTag::id, id);
    if (!hasId) {
        return;
    }

    bool hasPid = getNodeAttribute(node, XmlTag::pid, pid);
    bool hasPindex = getNodeAttribute(node, XmlTag::pindex, pindex);

    Object *obj = new Object(id);
    for (XmlNode &currentNode : node.children()) {
        const std::string currentName = currentNode.name();
        if (currentName == D3MF::XmlTag::mesh) {
            auto mesh = ReadMesh(currentNode);
            mesh->mName.Set(ai_to_string(id));

            if (hasPid) {
                auto it = mResourcesDictionnary.find(pid);
                if (hasPindex && it != mResourcesDictionnary.end() && it->second->getType() == ResourceType::RT_BaseMaterials) {
                    BaseMaterials *materials = static_cast<BaseMaterials *>(it->second);
                    mesh->mMaterialIndex = materials->mMaterialIndex[pindex];
                }
            }

            obj->mMeshes.push_back(mesh);
            obj->mMeshIndex.push_back(mMeshCount);
            mMeshCount++;
        } else if (currentName == D3MF::XmlTag::components) {
            for (XmlNode &currentSubNode : currentNode.children()) {
                const std::string subNodeName = currentSubNode.name();
                if (subNodeName == D3MF::XmlTag::component) {
                    int objectId = IdNotSet;
                    std::string componentTransformStr;
                    aiMatrix4x4 componentTransform;
                    if (getNodeAttribute(currentSubNode, D3MF::XmlTag::transform, componentTransformStr)) {
                        componentTransform = parseTransformMatrix(componentTransformStr);
                    }

                    if (getNodeAttribute(currentSubNode, D3MF::XmlTag::objectid, objectId)) {
                        obj->mComponents.push_back({ objectId, componentTransform });
                    }
                }
            }
        }
    }

    mResourcesDictionnary.insert(std::make_pair(id, obj));
}

aiMesh *XmlSerializer::ReadMesh(XmlNode &node) {
    if (node.empty()) {
        return nullptr;
    }

    aiMesh *mesh = new aiMesh();
    for (XmlNode &currentNode : node.children()) {
        const std::string currentName = currentNode.name();
        if (currentName == XmlTag::vertices) {
            ImportVertices(currentNode, mesh);
        } else if (currentName == XmlTag::triangles) {
            ImportTriangles(currentNode, mesh);
        }
    }

    return mesh;
}

void XmlSerializer::ReadMetadata(XmlNode &node) {
    pugi::xml_attribute attribute = node.attribute(D3MF::XmlTag::meta_name);
    const std::string name = attribute.as_string();
    const std::string value = node.value();
    if (name.empty()) {
        return;
    }

    MetaEntry entry;
    entry.name = name;
    entry.value = value;
    mMetaData.push_back(entry);
}

void XmlSerializer::ImportVertices(XmlNode &node, aiMesh *mesh) {
    ai_assert(nullptr != mesh);

    std::vector<aiVector3D> vertices;
    for (XmlNode &currentNode : node.children()) {
        const std::string currentName = currentNode.name();
        if (currentName == XmlTag::vertex) {
            vertices.push_back(ReadVertex(currentNode));
        }
    }

    mesh->mNumVertices = static_cast<unsigned int>(vertices.size());
    mesh->mVertices = new aiVector3D[mesh->mNumVertices];
    std::copy(vertices.begin(), vertices.end(), mesh->mVertices);
}

void XmlSerializer::ImportTriangles(XmlNode &node, aiMesh *mesh) {
    std::vector<aiFace> faces;
    for (XmlNode &currentNode : node.children()) {
        const std::string currentName = currentNode.name();
        if (currentName == XmlTag::triangle) {
            int pid = IdNotSet, p1 = IdNotSet;
            bool hasPid = getNodeAttribute(currentNode, D3MF::XmlTag::pid, pid);
            bool hasP1 = getNodeAttribute(currentNode, D3MF::XmlTag::p1, p1);

            if (hasPid && hasP1) {
                auto it = mResourcesDictionnary.find(pid);
                if (it != mResourcesDictionnary.end()) {
                    if (it->second->getType() == ResourceType::RT_BaseMaterials) {
                        BaseMaterials *baseMaterials = static_cast<BaseMaterials *>(it->second);
                        mesh->mMaterialIndex = baseMaterials->mMaterialIndex[p1];
                    } else if (it->second->getType() == ResourceType::RT_Texture2DGroup) {
                        if (mesh->mTextureCoords[0] == nullptr) {
                            Texture2DGroup *group = static_cast<Texture2DGroup *>(it->second);
                            const std::string name = ai_to_string(group->mTexId);
                            for (size_t i = 0; i < mMaterials.size(); ++i) {
                                if (name == mMaterials[i]->GetName().C_Str()) {
                                    mesh->mMaterialIndex = static_cast<unsigned int>(i);
                                }
                            }
                            mesh->mTextureCoords[0] = new aiVector3D[group->mTex2dCoords.size()];
                            for (unsigned int i = 0; i < group->mTex2dCoords.size(); ++i) {
                                mesh->mTextureCoords[0][i] = aiVector3D(group->mTex2dCoords[i].x, group->mTex2dCoords[i].y, 0);
                            }
                        }
                    } 
                }
            }

            aiFace face = ReadTriangle(currentNode);
            faces.push_back(face);
        }
    }

    mesh->mNumFaces = static_cast<unsigned int>(faces.size());
    mesh->mFaces = new aiFace[mesh->mNumFaces];
    mesh->mPrimitiveTypes = aiPrimitiveType_TRIANGLE;

    std::copy(faces.begin(), faces.end(), mesh->mFaces);
}

void XmlSerializer::ReadBaseMaterials(XmlNode &node) {
    int id = IdNotSet;
    if (getNodeAttribute(node, D3MF::XmlTag::id, id)) {
        BaseMaterials *baseMaterials = new BaseMaterials(id);

        for (XmlNode &currentNode : node.children()) {
            const std::string currentName = currentNode.name();
            if (currentName == XmlTag::basematerials_base) {
                baseMaterials->mMaterialIndex.push_back(static_cast<unsigned int>(mMaterials.size()));
                mMaterials.push_back(readMaterialDef(currentNode, id));
            }
        }

        mResourcesDictionnary.insert(std::make_pair(id, baseMaterials));
    }
}

void XmlSerializer::ReadEmbeddecTexture(XmlNode &node) {
    if (node.empty()) {
        return;
    }

    std::string value;
    EmbeddedTexture *tex2D = nullptr;
    if (XmlParser::getStdStrAttribute(node, XmlTag::id, value)) {
        tex2D = new EmbeddedTexture(atoi(value.c_str()));
    }
    if (nullptr == tex2D) {
        return;
    }

    if (XmlParser::getStdStrAttribute(node, XmlTag::path, value)) {
        tex2D->mPath = value;
    }
    if (XmlParser::getStdStrAttribute(node, XmlTag::texture_content_type, value)) {
        tex2D->mContentType = value;
    }
    if (XmlParser::getStdStrAttribute(node, XmlTag::texture_tilestyleu, value)) {
        tex2D->mTilestyleU = value;
    }
    if (XmlParser::getStdStrAttribute(node, XmlTag::texture_tilestylev, value)) {
        tex2D->mTilestyleV = value;
    }
    mEmbeddedTextures.emplace_back(tex2D);
    StoreEmbeddedTexture(tex2D);
}

void XmlSerializer::StoreEmbeddedTexture(EmbeddedTexture *tex) {
    aiMaterial *mat = new aiMaterial;
    aiString s;
    s.Set(ai_to_string(tex->mId).c_str());
    mat->AddProperty(&s, AI_MATKEY_NAME);
    const std::string name = "*" + tex->mPath;
    s.Set(name);
    mat->AddProperty(&s, AI_MATKEY_TEXTURE_DIFFUSE(0));

    aiColor3D col;
    mat->AddProperty<aiColor3D>(&col, 1, AI_MATKEY_COLOR_DIFFUSE);
    mat->AddProperty<aiColor3D>(&col, 1, AI_MATKEY_COLOR_AMBIENT);
    mat->AddProperty<aiColor3D>(&col, 1, AI_MATKEY_COLOR_EMISSIVE);
    mat->AddProperty<aiColor3D>(&col, 1, AI_MATKEY_COLOR_SPECULAR);
    mMaterials.emplace_back(mat);
}

void XmlSerializer::ReadTextureCoords2D(XmlNode &node, Texture2DGroup *tex2DGroup) {
    if (node.empty() || nullptr == tex2DGroup) {
        return;
    }

    int id = IdNotSet;
    if (XmlParser::getIntAttribute(node, "texid", id)) {
        tex2DGroup->mTexId = id;
    }

    double value = 0.0;
    for (XmlNode currentNode : node.children()) {
        const std::string currentName = currentNode.name();
        aiVector2D texCoord;
        if (currentName == XmlTag::texture_2d_coord) {
            XmlParser::getDoubleAttribute(currentNode, XmlTag::texture_cuurd_u, value);
            texCoord.x = (ai_real)value;
            XmlParser::getDoubleAttribute(currentNode, XmlTag::texture_cuurd_v, value);
            texCoord.y = (ai_real)value;
            tex2DGroup->mTex2dCoords.push_back(texCoord);
        }
    }
}

void XmlSerializer::ReadTextureGroup(XmlNode &node) {
    if (node.empty()) {
        return;
    }

    int id = IdNotSet;
    if (!XmlParser::getIntAttribute(node, XmlTag::id, id)) {
        return;
    }

    Texture2DGroup *group = new Texture2DGroup(id);
    ReadTextureCoords2D(node, group);
    mResourcesDictionnary.insert(std::make_pair(id, group));
}

aiMaterial *XmlSerializer::readMaterialDef(XmlNode &node, unsigned int basematerialsId) {
    aiMaterial *material = new aiMaterial();
    material->mNumProperties = 0;
    std::string name;
    bool hasName = getNodeAttribute(node, D3MF::XmlTag::basematerials_name, name);

    std::string stdMaterialName;
    const std::string strId(ai_to_string(basematerialsId));
    stdMaterialName += "id";
    stdMaterialName += strId;
    stdMaterialName += "_";
    if (hasName) {
        stdMaterialName += std::string(name);
    } else {
        stdMaterialName += "basemat_";
        stdMaterialName += ai_to_string(mMaterials.size());
    }

    aiString assimpMaterialName(stdMaterialName);
    material->AddProperty(&assimpMaterialName, AI_MATKEY_NAME);

    assignDiffuseColor(node, material);

    return material;
}

void XmlSerializer::StoreMaterialsInScene(aiScene *scene) {
    if (nullptr == scene || mMaterials.empty()) {
        return;
    }

    scene->mNumMaterials = static_cast<unsigned int>(mMaterials.size());
    scene->mMaterials = new aiMaterial *[scene->mNumMaterials];
    for (size_t i = 0; i < mMaterials.size(); ++i) {
        scene->mMaterials[i] = mMaterials[i];
    }
}

} // namespace D3MF
} // namespace Assimp