assimp/code/MMDImporter.cpp

/*
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Open Asset Import Library (assimp)
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All rights reserved.

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  following disclaimer.

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#ifndef ASSIMP_BUILD_NO_MMD_IMPORTER

#include "MMDImporter.h"
#include "MMDPmdParser.h"
#include "MMDPmxParser.h"
#include "MMDVmdParser.h"
#include "ConvertToLHProcess.h"
#include <assimp/DefaultIOSystem.h>
#include <assimp/Importer.hpp>
#include <assimp/ai_assert.h>
#include <assimp/scene.h>
#include <fstream>
#include <iomanip>
#include <memory>

static const aiImporterDesc desc = {"MMD Importer",
                                    "",
                                    "",
                                    "surfaces supported?",
                                    aiImporterFlags_SupportTextFlavour,
                                    0,
                                    0,
                                    0,
                                    0,
                                    "pmx"};

namespace Assimp {

using namespace std;

// ------------------------------------------------------------------------------------------------
//  Default constructor
MMDImporter::MMDImporter()
    : m_Buffer(),
      // m_pRootObject( NULL ),
      m_strAbsPath("") {
  DefaultIOSystem io;
  m_strAbsPath = io.getOsSeparator();
}

// ------------------------------------------------------------------------------------------------
//  Destructor.
MMDImporter::~MMDImporter() {
  // delete m_pRootObject;
  // m_pRootObject = NULL;
}

// ------------------------------------------------------------------------------------------------
//  Returns true, if file is an pmx file.
bool MMDImporter::CanRead(const std::string &pFile, IOSystem *pIOHandler,
                          bool checkSig) const {
  if (!checkSig) // Check File Extension
  {
    return SimpleExtensionCheck(pFile, "pmx");
  } else // Check file Header
  {
    static const char *pTokens[] = {"PMX "};
    return BaseImporter::SearchFileHeaderForToken(pIOHandler, pFile, pTokens,
                                                  1);
  }
}

// ------------------------------------------------------------------------------------------------
const aiImporterDesc *MMDImporter::GetInfo() const { return &desc; }

// ------------------------------------------------------------------------------------------------
//  MMD import implementation
void MMDImporter::InternReadFile(const std::string &file, aiScene *pScene,
                                 IOSystem * /*pIOHandler*/) {
  // Read file by istream
  std::filebuf fb;
  if (!fb.open(file, std::ios::in | std::ios::binary)) {
    throw DeadlyImportError("Failed to open file " + file + ".");
  }

  std::istream fileStream(&fb);

  // Get the file-size and validate it, throwing an exception when fails
  fileStream.seekg(0, fileStream.end);
  size_t fileSize = static_cast<size_t>(fileStream.tellg());
  fileStream.seekg(0, fileStream.beg);

  if (fileSize < sizeof(pmx::PmxModel)) {
    throw DeadlyImportError(file + " is too small.");
  }

  pmx::PmxModel model;
  model.Read(&fileStream);

  CreateDataFromImport(&model, pScene);
}

// ------------------------------------------------------------------------------------------------
void MMDImporter::CreateDataFromImport(const pmx::PmxModel *pModel,
                                       aiScene *pScene) {
  if (pModel == NULL) {
    return;
  }

  aiNode *pNode = new aiNode;
  if (!pModel->model_name.empty()) {
    pNode->mName.Set(pModel->model_name);
  }

  pScene->mRootNode = pNode;

  pNode = new aiNode;
  pScene->mRootNode->addChildren(1, &pNode);
  pNode->mName.Set(string(pModel->model_name) + string("_mesh"));

  // split mesh by materials
  pNode->mNumMeshes = pModel->material_count;
  pNode->mMeshes = new unsigned int[pNode->mNumMeshes];
  for (unsigned int index = 0; index < pNode->mNumMeshes; index++) {
    pNode->mMeshes[index] = index;
  }

  pScene->mNumMeshes = pModel->material_count;
  pScene->mMeshes = new aiMesh *[pScene->mNumMeshes];
  for (unsigned int i = 0, indexStart = 0; i < pScene->mNumMeshes; i++) {
    const int indexCount = pModel->materials[i].index_count;

    pScene->mMeshes[i] = CreateMesh(pModel, indexStart, indexCount);
    pScene->mMeshes[i]->mName = pModel->materials[i].material_name;
    pScene->mMeshes[i]->mMaterialIndex = i;
    indexStart += indexCount;
  }

  // create node hierarchy for bone position
  std::unique_ptr<aiNode *[]> ppNode(new aiNode *[pModel->bone_count]);
  for (auto i = 0; i < pModel->bone_count; i++) {
    ppNode[i] = new aiNode(pModel->bones[i].bone_name);
  }

  for (auto i = 0; i < pModel->bone_count; i++) {
    const pmx::PmxBone &bone = pModel->bones[i];

    if (bone.parent_index < 0) {
      pScene->mRootNode->addChildren(1, ppNode.get() + i);
    } else {
      ppNode[bone.parent_index]->addChildren(1, ppNode.get() + i);

      aiVector3D v3 = aiVector3D(
          bone.position[0] - pModel->bones[bone.parent_index].position[0],
          bone.position[1] - pModel->bones[bone.parent_index].position[1],
          bone.position[2] - pModel->bones[bone.parent_index].position[2]);
      aiMatrix4x4::Translation(v3, ppNode[i]->mTransformation);
    }
  }

  // create materials
  pScene->mNumMaterials = pModel->material_count;
  pScene->mMaterials = new aiMaterial *[pScene->mNumMaterials];
  for (unsigned int i = 0; i < pScene->mNumMaterials; i++) {
    pScene->mMaterials[i] = CreateMaterial(&pModel->materials[i], pModel);
  }

  // Convert everything to OpenGL space
  MakeLeftHandedProcess convertProcess;
  convertProcess.Execute(pScene);

  FlipUVsProcess uvFlipper;
  uvFlipper.Execute(pScene);

  FlipWindingOrderProcess windingFlipper;
  windingFlipper.Execute(pScene);
}

// ------------------------------------------------------------------------------------------------
aiMesh *MMDImporter::CreateMesh(const pmx::PmxModel *pModel,
                                const int indexStart, const int indexCount) {
  aiMesh *pMesh = new aiMesh;

  pMesh->mNumVertices = indexCount;

  pMesh->mNumFaces = indexCount / 3;
  pMesh->mFaces = new aiFace[pMesh->mNumFaces];

  const int numIndices = 3; // triangular face
  for (unsigned int index = 0; index < pMesh->mNumFaces; index++) {
    pMesh->mFaces[index].mNumIndices = numIndices;
    unsigned int *indices = new unsigned int[numIndices];
    indices[0] = numIndices * index;
    indices[1] = numIndices * index + 1;
    indices[2] = numIndices * index + 2;
    pMesh->mFaces[index].mIndices = indices;
  }

  pMesh->mVertices = new aiVector3D[pMesh->mNumVertices];
  pMesh->mNormals = new aiVector3D[pMesh->mNumVertices];
  pMesh->mTextureCoords[0] = new aiVector3D[pMesh->mNumVertices];
  pMesh->mNumUVComponents[0] = 2;

  // additional UVs
  for (int i = 1; i <= pModel->setting.uv; i++) {
    pMesh->mTextureCoords[i] = new aiVector3D[pMesh->mNumVertices];
    pMesh->mNumUVComponents[i] = 4;
  }

  map<int, vector<aiVertexWeight>> bone_vertex_map;

  // fill in contents and create bones
  for (int index = 0; index < indexCount; index++) {
    const pmx::PmxVertex *v =
        &pModel->vertices[pModel->indices[indexStart + index]];
    const float *position = v->position;
    pMesh->mVertices[index].Set(position[0], position[1], position[2]);
    const float *normal = v->normal;

    pMesh->mNormals[index].Set(normal[0], normal[1], normal[2]);
    pMesh->mTextureCoords[0][index].x = v->uv[0];
    pMesh->mTextureCoords[0][index].y = v->uv[1];

    for (int i = 1; i <= pModel->setting.uv; i++) {
      // TODO: wrong here? use quaternion transform?
      pMesh->mTextureCoords[i][index].x = v->uva[i][0];
      pMesh->mTextureCoords[i][index].y = v->uva[i][1];
    }

    // handle bone map
    const auto vsBDEF1_ptr =
        dynamic_cast<pmx::PmxVertexSkinningBDEF1 *>(v->skinning.get());
    const auto vsBDEF2_ptr =
        dynamic_cast<pmx::PmxVertexSkinningBDEF2 *>(v->skinning.get());
    const auto vsBDEF4_ptr =
        dynamic_cast<pmx::PmxVertexSkinningBDEF4 *>(v->skinning.get());
    const auto vsSDEF_ptr =
        dynamic_cast<pmx::PmxVertexSkinningSDEF *>(v->skinning.get());
    switch (v->skinning_type) {
    case pmx::PmxVertexSkinningType::BDEF1:
      bone_vertex_map[vsBDEF1_ptr->bone_index].push_back(
          aiVertexWeight(index, 1.0));
      break;
    case pmx::PmxVertexSkinningType::BDEF2:
      bone_vertex_map[vsBDEF2_ptr->bone_index1].push_back(
          aiVertexWeight(index, vsBDEF2_ptr->bone_weight));
      bone_vertex_map[vsBDEF2_ptr->bone_index2].push_back(
          aiVertexWeight(index, 1.0f - vsBDEF2_ptr->bone_weight));
      break;
    case pmx::PmxVertexSkinningType::BDEF4:
      bone_vertex_map[vsBDEF4_ptr->bone_index1].push_back(
          aiVertexWeight(index, vsBDEF4_ptr->bone_weight1));
      bone_vertex_map[vsBDEF4_ptr->bone_index2].push_back(
          aiVertexWeight(index, vsBDEF4_ptr->bone_weight2));
      bone_vertex_map[vsBDEF4_ptr->bone_index3].push_back(
          aiVertexWeight(index, vsBDEF4_ptr->bone_weight3));
      bone_vertex_map[vsBDEF4_ptr->bone_index4].push_back(
          aiVertexWeight(index, vsBDEF4_ptr->bone_weight4));
      break;
    case pmx::PmxVertexSkinningType::SDEF: // TODO: how to use sdef_c, sdef_r0,
                                           // sdef_r1?
      bone_vertex_map[vsSDEF_ptr->bone_index1].push_back(
          aiVertexWeight(index, vsSDEF_ptr->bone_weight));
      bone_vertex_map[vsSDEF_ptr->bone_index2].push_back(
          aiVertexWeight(index, 1.0f - vsSDEF_ptr->bone_weight));
      break;
    case pmx::PmxVertexSkinningType::QDEF:
      const auto vsQDEF_ptr =
          dynamic_cast<pmx::PmxVertexSkinningQDEF *>(v->skinning.get());
      bone_vertex_map[vsQDEF_ptr->bone_index1].push_back(
          aiVertexWeight(index, vsQDEF_ptr->bone_weight1));
      bone_vertex_map[vsQDEF_ptr->bone_index2].push_back(
          aiVertexWeight(index, vsQDEF_ptr->bone_weight2));
      bone_vertex_map[vsQDEF_ptr->bone_index3].push_back(
          aiVertexWeight(index, vsQDEF_ptr->bone_weight3));
      bone_vertex_map[vsQDEF_ptr->bone_index4].push_back(
          aiVertexWeight(index, vsQDEF_ptr->bone_weight4));
      break;
    }
  }

  // make all bones for each mesh
  // assign bone weights to skinned bones (otherwise just initialize)
  auto bone_ptr_ptr = new aiBone *[pModel->bone_count];
  pMesh->mNumBones = pModel->bone_count;
  pMesh->mBones = bone_ptr_ptr;
  for (auto ii = 0; ii < pModel->bone_count; ++ii) {
    auto pBone = new aiBone;
    const auto &pmxBone = pModel->bones[ii];
    pBone->mName = pmxBone.bone_name;
    aiVector3D pos(pmxBone.position[0], pmxBone.position[1], pmxBone.position[2]);
    aiMatrix4x4::Translation(-pos, pBone->mOffsetMatrix);
    auto it = bone_vertex_map.find(ii);
    if (it != bone_vertex_map.end()) {
      pBone->mNumWeights = static_cast<unsigned int>(it->second.size());
      pBone->mWeights = new aiVertexWeight[pBone->mNumWeights];
      for (unsigned int j = 0; j < pBone->mNumWeights; j++) {
          pBone->mWeights[j] = it->second[j];
      }
    }
    bone_ptr_ptr[ii] = pBone;
  }

  return pMesh;
}

// ------------------------------------------------------------------------------------------------
aiMaterial *MMDImporter::CreateMaterial(const pmx::PmxMaterial *pMat,
                                        const pmx::PmxModel *pModel) {
  aiMaterial *mat = new aiMaterial();
  aiString name(pMat->material_english_name);
  mat->AddProperty(&name, AI_MATKEY_NAME);

  aiColor3D diffuse(pMat->diffuse[0], pMat->diffuse[1], pMat->diffuse[2]);
  mat->AddProperty(&diffuse, 1, AI_MATKEY_COLOR_DIFFUSE);
  aiColor3D specular(pMat->specular[0], pMat->specular[1], pMat->specular[2]);
  mat->AddProperty(&specular, 1, AI_MATKEY_COLOR_SPECULAR);
  aiColor3D ambient(pMat->ambient[0], pMat->ambient[1], pMat->ambient[2]);
  mat->AddProperty(&ambient, 1, AI_MATKEY_COLOR_AMBIENT);

  float opacity = pMat->diffuse[3];
  mat->AddProperty(&opacity, 1, AI_MATKEY_OPACITY);
  float shininess = pMat->specularlity;
  mat->AddProperty(&shininess, 1, AI_MATKEY_SHININESS_STRENGTH);

  aiString texture_path(pModel->textures[pMat->diffuse_texture_index]);
  mat->AddProperty(&texture_path, AI_MATKEY_TEXTURE(aiTextureType_DIFFUSE, 0));
  int mapping_uvwsrc = 0;
  mat->AddProperty(&mapping_uvwsrc, 1,
                   AI_MATKEY_UVWSRC(aiTextureType_DIFFUSE, 0));

  return mat;
}

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

} // Namespace Assimp

#endif // !! ASSIMP_BUILD_NO_MMD_IMPORTER