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Open Asset Import Library (assimp)

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* Redistributions in binary form must reproduce the above

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/** @file  FBXImporter.cpp

 *  @brief Implementation of the FBX importer.

 */

#ifndef ASSIMP_BUILD_NO_FBX_IMPORTER

#include "FBXImporter.h"

#include "FBXConverter.h"

#include "FBXDocument.h"

#include "FBXParser.h"

#include "FBXTokenizer.h"

#include "FBXUtil.h"

#include <assimp/MemoryIOWrapper.h>

#include <assimp/StreamReader.h>

#include <assimp/importerdesc.h>

#include <assimp/Importer.hpp>

namespace Assimp {

template <>

const char *LogFunctions<FBXImporter>::Prefix() {

  return "FBX: ";

}

} // namespace Assimp

using namespace Assimp;

using namespace Assimp::Formatter;

using namespace Assimp::FBX;

namespace {

    static constexpr aiImporterDesc desc = {

      "Autodesk FBX Importer",

      "",

      "",

      "",

      aiImporterFlags_SupportTextFlavour,

      0,

      0,

      0,

      0,

      "fbx"

    };

}

// ------------------------------------------------------------------------------------------------

// Returns whether the class can handle the format of the given file.

bool FBXImporter::CanRead(const std::string & pFile, IOSystem * pIOHandler, bool /*checkSig*/) const {

  // at least ASCII-FBX files usually have a 'FBX' somewhere in their head

  static const char *tokens[] = { " \n\r\n ", "fbx" };

  return SearchFileHeaderForToken(pIOHandler, pFile, tokens, AI_COUNT_OF(tokens));

}

// ------------------------------------------------------------------------------------------------

// List all extensions handled by this loader

const aiImporterDesc *FBXImporter::GetInfo() const {

  return &desc;

}

// ------------------------------------------------------------------------------------------------

// Setup configuration properties for the loader

void FBXImporter::SetupProperties(const Importer *pImp) {

    mSettings.readAllLayers = pImp->GetPropertyBool(AI_CONFIG_IMPORT_FBX_READ_ALL_GEOMETRY_LAYERS, true);

    mSettings.readAllMaterials = pImp->GetPropertyBool(AI_CONFIG_IMPORT_FBX_READ_ALL_MATERIALS, false);

    mSettings.readMaterials = pImp->GetPropertyBool(AI_CONFIG_IMPORT_FBX_READ_MATERIALS, true);

    mSettings.readTextures = pImp->GetPropertyBool(AI_CONFIG_IMPORT_FBX_READ_TEXTURES, true);

    mSettings.readCameras = pImp->GetPropertyBool(AI_CONFIG_IMPORT_FBX_READ_CAMERAS, true);

    mSettings.readLights = pImp->GetPropertyBool(AI_CONFIG_IMPORT_FBX_READ_LIGHTS, true);

    mSettings.readAnimations = pImp->GetPropertyBool(AI_CONFIG_IMPORT_FBX_READ_ANIMATIONS, true);

    mSettings.readWeights = pImp->GetPropertyBool(AI_CONFIG_IMPORT_FBX_READ_WEIGHTS, true);

    mSettings.strictMode = pImp->GetPropertyBool(AI_CONFIG_IMPORT_FBX_STRICT_MODE, false);

    mSettings.preservePivots = pImp->GetPropertyBool(AI_CONFIG_IMPORT_FBX_PRESERVE_PIVOTS, true);

    mSettings.optimizeEmptyAnimationCurves = pImp->GetPropertyBool(AI_CONFIG_IMPORT_FBX_OPTIMIZE_EMPTY_ANIMATION_CURVES, true);

    mSettings.useLegacyEmbeddedTextureNaming = pImp->GetPropertyBool(AI_CONFIG_IMPORT_FBX_EMBEDDED_TEXTURES_LEGACY_NAMING, false);

    mSettings.removeEmptyBones = pImp->GetPropertyBool(AI_CONFIG_IMPORT_REMOVE_EMPTY_BONES, true);

    mSettings.convertToMeters = pImp->GetPropertyBool(AI_CONFIG_FBX_CONVERT_TO_M, false);

    mSettings.ignoreUpDirection = pImp->GetPropertyBool(AI_CONFIG_IMPORT_FBX_IGNORE_UP_DIRECTION, false);

    mSettings.useSkeleton = pImp->GetPropertyBool(AI_CONFIG_FBX_USE_SKELETON_BONE_CONTAINER, false);

}

// ------------------------------------------------------------------------------------------------

// Imports the given file into the given scene structure.

void FBXImporter::InternReadFile(const std::string &pFile, aiScene *pScene, IOSystem *pIOHandler) {

  auto streamCloser = [&](IOStream *pStream) {

    pIOHandler->Close(pStream);

  };

  std::unique_ptr<IOStream, decltype(streamCloser)> stream(pIOHandler->Open(pFile, "rb"), streamCloser);

  if (!stream) {

    ThrowException("Could not open file for reading");

  }

    ASSIMP_LOG_DEBUG("Reading FBX file");

  // read entire file into memory - no streaming for this, fbx

  // files can grow large, but the assimp output data structure

  // then becomes very large, too. Assimp doesn't support

  // streaming for its output data structures so the net win with

  // streaming input data would be very low.

  std::vector<char> contents;

  contents.resize(stream->FileSize() + 1);

  stream->Read(&*contents.begin(), 1, contents.size() - 1);

  contents[contents.size() - 1] = 0;

  const char *const begin = &*contents.begin();

  // broad-phase tokenized pass in which we identify the core

  // syntax elements of FBX (brackets, commas, key:value mappings)

  TokenList tokens;

    Assimp::StackAllocator tempAllocator;

    try {

    bool is_binary = false;

    if (!strncmp(begin, "Kaydara FBX Binary", 18)) {

      is_binary = true;

            TokenizeBinary(tokens, begin, contents.size(), tempAllocator);

    } else {

            Tokenize(tokens, begin, tempAllocator);

    }

    // use this information to construct a very rudimentary

    // parse-tree representing the FBX scope structure

        Parser parser(tokens, tempAllocator, is_binary);

    // take the raw parse-tree and convert it to a FBX DOM

    Document doc(parser, mSettings);

    // convert the FBX DOM to aiScene

    ConvertToAssimpScene(pScene, doc, mSettings.removeEmptyBones);

    // size relative to cm

    float size_relative_to_cm = doc.GlobalSettings().UnitScaleFactor();

        if (size_relative_to_cm == 0.0) {

      // BaseImporter later asserts that fileScale is non-zero.

      ThrowException("The UnitScaleFactor must be non-zero");

        }

    // Set FBX file scale is relative to CM must be converted to M for

    // assimp universal format (M)

    SetFileScale(size_relative_to_cm * 0.01f);

    // This collection does not own the memory for the tokens, but we need to call their d'tor

        std::for_each(tokens.begin(), tokens.end(), Util::destructor_fun<Token>());

    } catch (std::exception &) {

        std::for_each(tokens.begin(), tokens.end(), Util::destructor_fun<Token>());

        throw;

  }

}

#endif // !ASSIMP_BUILD_NO_FBX_IMPORTER