assimp/code/AssetLib/X3D/X3DImporter.cpp

/*
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/// \file   X3DImporter.cpp
/// \brief  X3D-format files importer for Assimp: main algorithm implementation.
/// \date   2015-2016
/// \author smal.root@gmail.com

#ifndef ASSIMP_BUILD_NO_X3D_IMPORTER

#include "X3DImporter.hpp"
#include <assimp/StringUtils.h>

// Header files, Assimp.
#include <assimp/DefaultIOSystem.h>
#include <assimp/fast_atof.h>

// Header files, stdlib.
#include <iterator>
#include <memory>
#include <string>

namespace Assimp {

/// Constant which holds the importer description
const aiImporterDesc X3DImporter::Description = {
    "Extensible 3D(X3D) Importer",
    "smalcom",
    "",
    "See documentation in source code. Chapter: Limitations.",
    aiImporterFlags_SupportTextFlavour | aiImporterFlags_SupportBinaryFlavour | aiImporterFlags_LimitedSupport | aiImporterFlags_Experimental,
    0,
    0,
    0,
    0,
    "x3d x3db"
};

struct WordIterator {
    using iterator_category = std::input_iterator_tag;
    using value_type = const char *;
    using difference_type = ptrdiff_t;
    using pointer = value_type *;
    using reference = value_type &;

    static const char *whitespace;
    const char *mStart, *mEnd;

    WordIterator(const char *start, const char *end) :
            mStart(start),
            mEnd(end) {
        mStart = start + ::strspn(start, whitespace);
        if (mStart >= mEnd) {
            mStart = 0;
        }
    }
    WordIterator() :
            mStart(0),
            mEnd(0) {}
    WordIterator(const WordIterator &other) :
            mStart(other.mStart),
            mEnd(other.mEnd) {}
    WordIterator &operator=(const WordIterator &other) {
        mStart = other.mStart;
        mEnd = other.mEnd;
        return *this;
    }

    bool operator==(const WordIterator &other) const { return mStart == other.mStart; }

    bool operator!=(const WordIterator &other) const { return mStart != other.mStart; }

    WordIterator &operator++() {
        mStart += strcspn(mStart, whitespace);
        mStart += strspn(mStart, whitespace);
        if (mStart >= mEnd) {
            mStart = 0;
        }
        return *this;
    }
    WordIterator operator++(int) {
        WordIterator result(*this);
        ++(*this);
        return result;
    }
    const char *operator*() const { return mStart; }
};

const char *WordIterator::whitespace = ", \t\r\n";

X3DImporter::X3DImporter() :
        mNodeElementCur(nullptr),
        mXmlParser(nullptr),
        mpIOHandler(nullptr) {
    // empty
}

X3DImporter::~X3DImporter() {
    // Clear() is accounting if data already is deleted. So, just check again if all data is deleted.
    Clear();
}

void X3DImporter::Clear() {
    mNodeElementCur = nullptr;
    // Delete all elements
    if (!NodeElement_List.empty()) {
        for (std::list<X3DNodeElementBase *>::iterator it = NodeElement_List.begin(); it != NodeElement_List.end(); ++it) {
            delete *it;
        }
        NodeElement_List.clear();
    }
}

void X3DImporter::ParseFile(const std::string &file, IOSystem *pIOHandler) {
    ai_assert(nullptr != pIOHandler);

    static const std::string mode = "rb";
    std::unique_ptr<IOStream> fileStream(pIOHandler->Open(file, mode));
    if (!fileStream.get()) {
        throw DeadlyImportError("Failed to open file " + file + ".");
    }
}

/*********************************************************************************************************************************************/
/************************************************************ Functions: find set ************************************************************/
/*********************************************************************************************************************************************/

bool X3DImporter::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool pCheckSig) const {
    const std::string extension = GetExtension(pFile);

    if ((extension == "x3d") || (extension == "x3db")) {
        return true;
    }

    if (!extension.length() || pCheckSig) {
        const char *tokens[] = { "DOCTYPE X3D PUBLIC", "http://www.web3d.org/specifications/x3d" };

        return SearchFileHeaderForToken(pIOHandler, pFile, tokens, 2);
    }

    return false;
}

void X3DImporter::GetExtensionList(std::set<std::string> &pExtensionList) {
    pExtensionList.insert("x3d");
    pExtensionList.insert("x3db");
}

const aiImporterDesc *X3DImporter::GetInfo() const {
    return &Description;
}

void X3DImporter::InternReadFile(const std::string &pFile, aiScene *pScene, IOSystem *pIOHandler) {
    mpIOHandler = pIOHandler;

    Clear(); // delete old graph.
    std::string::size_type slashPos = pFile.find_last_of("\\/");
    pIOHandler->PushDirectory(slashPos == std::string::npos ? std::string() : pFile.substr(0, slashPos + 1));
    ParseFile(pFile, pIOHandler);
    pIOHandler->PopDirectory();
    if (NodeElement_List.empty())
        return;
    //
    // Assimp use static arrays of objects for fast speed of rendering. That's good, but need some additional operations/
    // We know that geometry objects(meshes) are stored in <Shape>, also in <Shape>-><Appearance> materials(in Assimp logical view)
    // are stored. So at first we need to count how meshes and materials are stored in scene graph.
    //
    // at first creating root node for aiScene.
    pScene->mRootNode = new aiNode;
    pScene->mRootNode->mParent = nullptr;
    pScene->mFlags |= AI_SCENE_FLAGS_ALLOW_SHARED;
    //search for root node element
    mNodeElementCur = NodeElement_List.front();
    while (mNodeElementCur->Parent != nullptr)
        mNodeElementCur = mNodeElementCur->Parent;

    { // fill aiScene with objects.
        std::list<aiMesh *> mesh_list;
        std::list<aiMaterial *> mat_list;
        std::list<aiLight *> light_list;

        // create nodes tree
//        Postprocess_BuildNode(*mNodeElementCur, *pScene->mRootNode, mesh_list, mat_list, light_list);
        // copy needed data to scene
        if (!mesh_list.empty()) {
            std::list<aiMesh *>::const_iterator it = mesh_list.begin();

            pScene->mNumMeshes = static_cast<unsigned int>(mesh_list.size());
            pScene->mMeshes = new aiMesh *[pScene->mNumMeshes];
            for (size_t i = 0; i < pScene->mNumMeshes; i++)
                pScene->mMeshes[i] = *it++;
        }

        if (!mat_list.empty()) {
            std::list<aiMaterial *>::const_iterator it = mat_list.begin();

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

        if (!light_list.empty()) {
            std::list<aiLight *>::const_iterator it = light_list.begin();

            pScene->mNumLights = static_cast<unsigned int>(light_list.size());
            pScene->mLights = new aiLight *[pScene->mNumLights];
            for (size_t i = 0; i < pScene->mNumLights; i++)
                pScene->mLights[i] = *it++;
        }
    }
}

} // namespace Assimp

#endif // !ASSIMP_BUILD_NO_X3D_IMPORTER