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/** @file  MD5Loader.cpp

 *  @brief Implementation of the MD5 importer class

 */

#ifndef ASSIMP_BUILD_NO_MD5_IMPORTER

// internal headers

#include "MD5Loader.h"

#include <assimp/MathFunctions.h>

#include <assimp/RemoveComments.h>

#include <assimp/SkeletonMeshBuilder.h>

#include <assimp/StringComparison.h>

#include <assimp/fast_atof.h>

#include <assimp/importerdesc.h>

#include <assimp/scene.h>

#include <assimp/DefaultLogger.hpp>

#include <assimp/IOSystem.hpp>

#include <assimp/Importer.hpp>

#include <memory>

#include <vector>

using namespace Assimp;

// Minimum weight value. Weights inside [-n ... n] are ignored

#define AI_MD5_WEIGHT_EPSILON Math::getEpsilon<float>()

static constexpr aiImporterDesc desc = {

    "Doom 3 / MD5 Mesh Importer",

    "",

    "",

    "",

    aiImporterFlags_SupportBinaryFlavour,

    0,

    0,

    0,

    0,

    "md5mesh md5camera md5anim"

};

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

// Validate one vertex's weight references and accumulate, per bone, how many non-negligible

// weights influence it. Weight and bone indices are read straight from the file, so reject

// out-of-range values here to keep all later piCount[] and joint lookups in bounds.

static void CountVertexBoneWeights(const MD5::VertexDesc &vertex, const MD5::WeightArray &weights,

        std::vector<unsigned int> &boneWeightCount) {

    for (unsigned int w = vertex.mFirstWeight; w < vertex.mFirstWeight + vertex.mNumWeights; ++w) {

        if (w >= weights.size()) {

            throw DeadlyImportError("MD5MESH: Invalid weight index");

        }

        const MD5::WeightDesc &weightDesc = weights[w];

        if (weightDesc.mBone >= boneWeightCount.size()) {

            throw DeadlyImportError("MD5MESH: Invalid bone index");

        }

        // FIX for some invalid exporters

        if (!(weightDesc.mWeight < AI_MD5_WEIGHT_EPSILON && weightDesc.mWeight >= -AI_MD5_WEIGHT_EPSILON)) {

            ++boneWeightCount[weightDesc.mBone];

        }

    }

}

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

// Constructor to be privately used by Importer

MD5Importer::MD5Importer() :

        mIOHandler(nullptr),

        mBuffer(),

        mFileSize(),

        mLineNumber(),

        mScene(),

        mHadMD5Mesh(),

        mHadMD5Anim(),

        mHadMD5Camera(),

        mCconfigNoAutoLoad(false) {

    // empty

}

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

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

bool MD5Importer::CanRead(const std::string &pFile, IOSystem *pIOHandler, bool /*checkSig*/) const {

    static const char *tokens[] = { "MD5Version" };

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

}

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

// Get list of all supported extensions

const aiImporterDesc *MD5Importer::GetInfo() const {

    return &desc;

}

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

// Setup import properties

void MD5Importer::SetupProperties(const Importer *pImp) {

    // AI_CONFIG_IMPORT_MD5_NO_ANIM_AUTOLOAD

    mCconfigNoAutoLoad = (0 != pImp->GetPropertyInteger(AI_CONFIG_IMPORT_MD5_NO_ANIM_AUTOLOAD, 0));

}

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

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

void MD5Importer::InternReadFile(const std::string &pFile, aiScene *_pScene, IOSystem *pIOHandler) {

    mIOHandler = pIOHandler;

    mScene = _pScene;

    mHadMD5Mesh = false;

    mHadMD5Anim = false;

    mHadMD5Camera = false;

    // remove the file extension

    const std::string::size_type pos = pFile.find_last_of('.');

    mFile = (std::string::npos == pos ? pFile : pFile.substr(0, pos + 1));

    const std::string extension = GetExtension(pFile);

    try {

        if (extension == "md5camera") {

            LoadMD5CameraFile();

        } else if (mCconfigNoAutoLoad || extension == "md5anim") {

            // determine file extension and process just *one* file

            if (extension.length() == 0) {

                throw DeadlyImportError("Failure, need file extension to determine MD5 part type");

            }

            if (extension == "md5anim") {

                LoadMD5AnimFile();

            } else if (extension == "md5mesh") {

                LoadMD5MeshFile();

            }

        } else {

            LoadMD5MeshFile();

            LoadMD5AnimFile();

        }

    } catch (...) { // std::exception, Assimp::DeadlyImportError

        UnloadFileFromMemory();

        throw;

    }

    // make sure we have at least one file

    if (!mHadMD5Mesh && !mHadMD5Anim && !mHadMD5Camera) {

        throw DeadlyImportError("Failed to read valid contents out of this MD5* file");

    }

    // Now rotate the whole scene 90 degrees around the x axis to match our internal coordinate system

    mScene->mRootNode->mTransformation = aiMatrix4x4(1.f, 0.f, 0.f, 0.f,

            0.f, 0.f, 1.f, 0.f, 0.f, -1.f, 0.f, 0.f, 0.f, 0.f, 0.f, 1.f);

    // the output scene wouldn't pass the validation without this flag

    if (!mHadMD5Mesh) {

        mScene->mFlags |= AI_SCENE_FLAGS_INCOMPLETE;

    }

    // clean the instance -- the BaseImporter instance may be reused later.

    UnloadFileFromMemory();

}

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

// Load a file into a memory buffer

void MD5Importer::LoadFileIntoMemory(IOStream *file) {

    // unload the previous buffer, if any

    UnloadFileFromMemory();

    ai_assert(nullptr != file);

    mFileSize = (unsigned int)file->FileSize();

    ai_assert(mFileSize);

    // allocate storage and copy the contents of the file to a memory buffer

    mBuffer = new char[mFileSize + 1];

    file->Read((void *)mBuffer, 1, mFileSize);

    mLineNumber = 1;

    // append a terminal 0

    mBuffer[mFileSize] = '\0';

    // now remove all line comments from the file

    CommentRemover::RemoveLineComments("//", mBuffer, ' ');

}

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

// Unload the current memory buffer

void MD5Importer::UnloadFileFromMemory() {

    // delete the file buffer

    delete[] mBuffer;

    mBuffer = nullptr;

    mFileSize = 0;

}

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

// Build unique vertices

void MD5Importer::MakeDataUnique(MD5::MeshDesc &meshSrc) {

    std::vector<bool> abHad(meshSrc.mVertices.size(), false);

    // allocate enough storage to keep the output structures

    const unsigned int iNewNum = static_cast<unsigned int>(meshSrc.mFaces.size() * 3);

    unsigned int iNewIndex = static_cast<unsigned int>(meshSrc.mVertices.size());

    meshSrc.mVertices.resize(iNewNum);

    // try to guess how much storage we'll need for new weights

    const float fWeightsPerVert = meshSrc.mWeights.size() / (float)iNewIndex;

    const unsigned int guess = (unsigned int)(fWeightsPerVert * iNewNum);

    meshSrc.mWeights.reserve(guess + (guess >> 3)); // + 12.5% as buffer

    for (FaceArray::const_iterator iter = meshSrc.mFaces.begin(), iterEnd = meshSrc.mFaces.end(); iter != iterEnd; ++iter) {

        const aiFace &face = *iter;

        // Reject unpopulated faces (numtris > tri-lines leaves mIndices == nullptr).

        if (face.mNumIndices != 3 || face.mIndices == nullptr) {

            throw DeadlyImportError("MD5MESH: face is missing its three vertex indices");

        }

        for (unsigned int i = 0; i < 3; ++i) {

            // Check mIndices[i] not [0]: catches out-of-range indices on faces 1 and 2.

            if (face.mIndices[i] >= meshSrc.mVertices.size()) {

                throw DeadlyImportError("MD5MESH: Invalid vertex index");

            }

            if (abHad[face.mIndices[i]]) {

                // generate a new vertex

                meshSrc.mVertices[iNewIndex] = meshSrc.mVertices[face.mIndices[i]];

                face.mIndices[i] = iNewIndex++;

            } else

                abHad[face.mIndices[i]] = true;

        }

        // swap face order

        std::swap(face.mIndices[0], face.mIndices[2]);

    }

}

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

// Recursive node graph construction from a MD5MESH

void MD5Importer::AttachChilds_Mesh(int iParentID, aiNode *piParent, BoneArray &bones) {

    ai_assert(nullptr != piParent);

    ai_assert(!piParent->mNumChildren);

    // First find out how many children we'll have

    for (int i = 0; i < (int)bones.size(); ++i) {

        if (iParentID != i && bones[i].mParentIndex == iParentID) {

            ++piParent->mNumChildren;

        }

    }

    if (piParent->mNumChildren) {

        piParent->mChildren = new aiNode *[piParent->mNumChildren];

        for (int i = 0; i < (int)bones.size(); ++i) {

            // (avoid infinite recursion)

            if (iParentID != i && bones[i].mParentIndex == iParentID) {

                aiNode *pc;

                // setup a new node

                *piParent->mChildren++ = pc = new aiNode();

                pc->mName = aiString(bones[i].mName);

                pc->mParent = piParent;

                // get the transformation matrix from rotation and translational components

                aiQuaternion quat;

                MD5::ConvertQuaternion(bones[i].mRotationQuat, quat);

                bones[i].mTransform = aiMatrix4x4(quat.GetMatrix());

                bones[i].mTransform.a4 = bones[i].mPositionXYZ.x;

                bones[i].mTransform.b4 = bones[i].mPositionXYZ.y;

                bones[i].mTransform.c4 = bones[i].mPositionXYZ.z;

                // store it for later use

                pc->mTransformation = bones[i].mInvTransform = bones[i].mTransform;

                bones[i].mInvTransform.Inverse();

                // the transformations for each bone are absolute, so we need to multiply them

                // with the inverse of the absolute matrix of the parent joint

                if (-1 != iParentID) {

                    pc->mTransformation = bones[iParentID].mInvTransform * pc->mTransformation;

                }

                // add children to this node, too

                AttachChilds_Mesh(i, pc, bones);

            }

        }

        // undo offset computations

        piParent->mChildren -= piParent->mNumChildren;

    }

}

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

// Recursive node graph construction from a MD5ANIM

void MD5Importer::AttachChilds_Anim(int iParentID, aiNode *piParent, AnimBoneArray &bones, const aiNodeAnim **node_anims) {

    ai_assert(nullptr != piParent);

    ai_assert(!piParent->mNumChildren);

    // First find out how many children we'll have

    for (int i = 0; i < (int)bones.size(); ++i) {

        if (iParentID != i && bones[i].mParentIndex == iParentID) {

            ++piParent->mNumChildren;

        }

    }

    if (piParent->mNumChildren) {

        piParent->mChildren = new aiNode *[piParent->mNumChildren];

        for (int i = 0; i < (int)bones.size(); ++i) {

            // (avoid infinite recursion)

            if (iParentID != i && bones[i].mParentIndex == iParentID) {

                aiNode *pc;

                // setup a new node

                *piParent->mChildren++ = pc = new aiNode();

                pc->mName = aiString(bones[i].mName);

                pc->mParent = piParent;

                // get the corresponding animation channel and its first frame

                const aiNodeAnim **cur = node_anims;

                while ((**cur).mNodeName != pc->mName)

                    ++cur;

                aiMatrix4x4::Translation((**cur).mPositionKeys[0].mValue, pc->mTransformation);

                pc->mTransformation = pc->mTransformation * aiMatrix4x4((**cur).mRotationKeys[0].mValue.GetMatrix());

                // add children to this node, too

                AttachChilds_Anim(i, pc, bones, node_anims);

            }

        }

        // undo offset computations

        piParent->mChildren -= piParent->mNumChildren;

    }

}

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

// Load a MD5MESH file

void MD5Importer::LoadMD5MeshFile() {

    std::string filename = mFile + "md5mesh";

    std::unique_ptr<IOStream> file(mIOHandler->Open(filename, "rb"));

    // Check whether we can read from the file

    if (file == nullptr || !file->FileSize()) {

        ASSIMP_LOG_WARN("Failed to access MD5MESH file: ", filename);

        return;

    }

    mHadMD5Mesh = true;

    LoadFileIntoMemory(file.get());

    // now construct a parser and parse the file

    MD5::MD5Parser parser(mBuffer, mFileSize);

    // load the mesh information from it

    MD5::MD5MeshParser meshParser(parser.mSections);

    // create the bone hierarchy - first the root node and dummy nodes for all meshes

    mScene->mRootNode = new aiNode("<MD5_Root>");

    mScene->mRootNode->mNumChildren = 2;

    mScene->mRootNode->mChildren = new aiNode *[2];

    // build the hierarchy from the MD5MESH file

    aiNode *pcNode = mScene->mRootNode->mChildren[1] = new aiNode();

    pcNode->mName.Set("<MD5_Hierarchy>");

    pcNode->mParent = mScene->mRootNode;

    AttachChilds_Mesh(-1, pcNode, meshParser.mJoints);

    pcNode = new aiNode();

    pcNode->mName.Set("<MD5_Mesh>");

    pcNode->mParent = mScene->mRootNode;

    mScene->mRootNode->mChildren[0] = pcNode;

#if 0

    if (pScene->mRootNode->mChildren[1]->mNumChildren) /* start at the right hierarchy level */

        SkeletonMeshBuilder skeleton_maker(pScene,pScene->mRootNode->mChildren[1]->mChildren[0]);

#else

    // FIX: MD5 files exported from Blender can have empty meshes

    unsigned int numMaterials = 0;

    for (std::vector<MD5::MeshDesc>::const_iterator it = meshParser.mMeshes.begin(), end = meshParser.mMeshes.end(); it != end; ++it) {

        if (!(*it).mFaces.empty() && !(*it).mVertices.empty()) {

            ++numMaterials;

        }

    }

    // generate all meshes

    mScene->mMeshes = new aiMesh *[numMaterials];

    mScene->mMaterials = new aiMaterial *[numMaterials];

    //  storage for node mesh indices

    pcNode->mNumMeshes = numMaterials;

    pcNode->mMeshes = new unsigned int[pcNode->mNumMeshes];

    for (unsigned int m = 0; m < pcNode->mNumMeshes; ++m) {

        pcNode->mMeshes[m] = m;

    }

    unsigned int n = 0;

    for (std::vector<MD5::MeshDesc>::iterator it = meshParser.mMeshes.begin(), end = meshParser.mMeshes.end(); it != end; ++it) {

        MD5::MeshDesc &meshSrc = *it;

        if (meshSrc.mFaces.empty() || meshSrc.mVertices.empty()) {

            continue;

        }

        aiMesh* mesh = new aiMesh();

        mScene->mMeshes[n] = mesh;

        ++mScene->mNumMeshes;

        mesh->mPrimitiveTypes = aiPrimitiveType_TRIANGLE;

        // generate unique vertices in our internal verbose format

        MakeDataUnique(meshSrc);

        std::string name(meshSrc.mShader.C_Str());

        name += ".msh";

        mesh->mName = name;

        mesh->mNumVertices = (unsigned int)meshSrc.mVertices.size();

        mesh->mVertices = new aiVector3D[mesh->mNumVertices];

        mesh->mTextureCoords[0] = new aiVector3D[mesh->mNumVertices];

        mesh->mNumUVComponents[0] = 2;

        // copy texture coordinates

        aiVector3D *pv = mesh->mTextureCoords[0];

        for (MD5::VertexArray::const_iterator iter = meshSrc.mVertices.begin(); iter != meshSrc.mVertices.end(); ++iter, ++pv) {

            pv->x = (*iter).mUV.x;

            pv->y = 1.0f - (*iter).mUV.y; // D3D to OpenGL

            pv->z = 0.0f;

        }

        // sort all bone weights - per bone

        // Use a vector so the buffer is released automatically even if a malformed

        // file makes the validation below throw.

        std::vector<unsigned int> piCount(meshParser.mJoints.size(), 0);

        for (MD5::VertexArray::const_iterator iter = meshSrc.mVertices.begin(); iter != meshSrc.mVertices.end(); ++iter) {

            CountVertexBoneWeights(*iter, meshSrc.mWeights, piCount);

        }

        // check how many we will need

        for (unsigned int p = 0; p < meshParser.mJoints.size(); ++p) {

            if (piCount[p]) mesh->mNumBones++;

        }

        // just for safety

        if (mesh->mNumBones) {

            mesh->mBones = new aiBone *[mesh->mNumBones];

            for (unsigned int q = 0, h = 0; q < meshParser.mJoints.size(); ++q) {

                if (!piCount[q]) continue;

                aiBone *p = mesh->mBones[h] = new aiBone();

                p->mNumWeights = piCount[q];

                p->mWeights = new aiVertexWeight[p->mNumWeights];

                p->mName = aiString(meshParser.mJoints[q].mName);

                p->mOffsetMatrix = meshParser.mJoints[q].mInvTransform;

                // store the index for later use

                MD5::BoneDesc &boneSrc = meshParser.mJoints[q];

                boneSrc.mMap = h++;

                // compute w-component of quaternion

                MD5::ConvertQuaternion(boneSrc.mRotationQuat, boneSrc.mRotationQuatConverted);

            }

            pv = mesh->mVertices;

            for (MD5::VertexArray::const_iterator iter = meshSrc.mVertices.begin(); iter != meshSrc.mVertices.end(); ++iter, ++pv) {

                // compute the final vertex position from all single weights

                *pv = aiVector3D();

                // there are models which have weights which don't sum to 1 ...

                ai_real fSum = 0.0;

                for (unsigned int jub = (*iter).mFirstWeight, w = jub; w < jub + (*iter).mNumWeights; ++w) {

                    fSum += meshSrc.mWeights[w].mWeight;

                }

                if (!fSum) {

                    ASSIMP_LOG_ERROR("MD5MESH: The sum of all vertex bone weights is 0");

                    continue;

                }

                // process bone weights

                for (unsigned int jub = (*iter).mFirstWeight, w = jub; w < jub + (*iter).mNumWeights; ++w) {

                    if (w >= meshSrc.mWeights.size()) {

                        throw DeadlyImportError("MD5MESH: Invalid weight index");

                    }

                    MD5::WeightDesc &weightDesc = meshSrc.mWeights[w];

                    if (weightDesc.mWeight < AI_MD5_WEIGHT_EPSILON && weightDesc.mWeight >= -AI_MD5_WEIGHT_EPSILON) {

                        continue;

                    }

                    const ai_real fNewWeight = weightDesc.mWeight / fSum;

                    // transform the local position into worldspace

                    MD5::BoneDesc &boneSrc = meshParser.mJoints[weightDesc.mBone];

                    const aiVector3D v = boneSrc.mRotationQuatConverted.Rotate(weightDesc.vOffsetPosition);

                    // use the original weight to compute the vertex position

                    // (some MD5s seem to depend on the invalid weight values ...)

                    *pv += ((boneSrc.mPositionXYZ + v) * (ai_real)weightDesc.mWeight);

                    aiBone *bone = mesh->mBones[boneSrc.mMap];

                    *bone->mWeights++ = aiVertexWeight((unsigned int)(pv - mesh->mVertices), fNewWeight);

                }

            }

            // undo our nice offset tricks ...

            for (unsigned int p = 0; p < mesh->mNumBones; ++p) {

                mesh->mBones[p]->mWeights -= mesh->mBones[p]->mNumWeights;

            }

        }

        // now setup all faces - we can directly copy the list

        // (however, take care that the aiFace destructor doesn't delete the mIndices array)

        mesh->mNumFaces = (unsigned int)meshSrc.mFaces.size();

        mesh->mFaces = new aiFace[mesh->mNumFaces];

        for (unsigned int c = 0; c < mesh->mNumFaces; ++c) {

            mesh->mFaces[c].mNumIndices = 3;

            mesh->mFaces[c].mIndices = meshSrc.mFaces[c].mIndices;

            meshSrc.mFaces[c].mIndices = nullptr;

        }

        // generate a material for the mesh

        aiMaterial *mat = new aiMaterial();

        mScene->mMaterials[n] = mat;

        ++mScene->mNumMaterials;

        // insert the typical doom3 textures:

        // nnn_local.tga  - normal map

        // nnn_h.tga      - height map

        // nnn_s.tga      - specular map

        // nnn_d.tga      - diffuse map

        if (meshSrc.mShader.length && !strchr(meshSrc.mShader.data, '.')) {

            aiString temp(meshSrc.mShader);

            temp.Append("_local.tga");

            mat->AddProperty(&temp, AI_MATKEY_TEXTURE_NORMALS(0));

            temp = aiString(meshSrc.mShader);

            temp.Append("_s.tga");

            mat->AddProperty(&temp, AI_MATKEY_TEXTURE_SPECULAR(0));

            temp = aiString(meshSrc.mShader);

            temp.Append("_d.tga");

            mat->AddProperty(&temp, AI_MATKEY_TEXTURE_DIFFUSE(0));

            temp = aiString(meshSrc.mShader);

            temp.Append("_h.tga");

            mat->AddProperty(&temp, AI_MATKEY_TEXTURE_HEIGHT(0));

            // set this also as material name

            mat->AddProperty(&meshSrc.mShader, AI_MATKEY_NAME);

        } else {

            mat->AddProperty(&meshSrc.mShader, AI_MATKEY_TEXTURE_DIFFUSE(0));

        }

        mesh->mMaterialIndex = n++;

    }

#endif

}

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

// Load an MD5ANIM file

void MD5Importer::LoadMD5AnimFile() {

    std::string pFile = mFile + "md5anim";

    std::unique_ptr<IOStream> file(mIOHandler->Open(pFile, "rb"));

    // Check whether we can read from the file

    if (!file || !file->FileSize()) {

        ASSIMP_LOG_WARN("Failed to read MD5ANIM file: ", pFile);

        return;

    }

    LoadFileIntoMemory(file.get());

    // parse the basic file structure

    MD5::MD5Parser parser(mBuffer, mFileSize);

    // load the animation information from the parse tree

    MD5::MD5AnimParser animParser(parser.mSections);

    // generate and fill the output animation

    if (animParser.mAnimatedBones.empty() || animParser.mFrames.empty() ||

            animParser.mBaseFrames.size() != animParser.mAnimatedBones.size()) {

        ASSIMP_LOG_ERROR("MD5ANIM: No frames or animated bones loaded");

    } else {

        mHadMD5Anim = true;

        mScene->mAnimations = new aiAnimation *[mScene->mNumAnimations = 1];

        aiAnimation *anim = mScene->mAnimations[0] = new aiAnimation();

        anim->mNumChannels = (unsigned int)animParser.mAnimatedBones.size();

        anim->mChannels = new aiNodeAnim *[anim->mNumChannels];

        for (unsigned int i = 0; i < anim->mNumChannels; ++i) {

            aiNodeAnim *node = anim->mChannels[i] = new aiNodeAnim();

            node->mNodeName = aiString(animParser.mAnimatedBones[i].mName);

            // allocate storage for the keyframes

            node->mPositionKeys = new aiVectorKey[animParser.mFrames.size()];

            node->mRotationKeys = new aiQuatKey[animParser.mFrames.size()];

        }

        // 1 tick == 1 frame

        anim->mTicksPerSecond = animParser.fFrameRate;

        for (FrameArray::const_iterator iter = animParser.mFrames.begin(), iterEnd = animParser.mFrames.end(); iter != iterEnd; ++iter) {

            double dTime = (double)(*iter).iIndex;

            aiNodeAnim **pcAnimNode = anim->mChannels;

            if (!(*iter).mValues.empty() || iter == animParser.mFrames.begin()) /* be sure we have at least one frame */

            {

                // now process all values in there ... read all joints

                MD5::BaseFrameDesc *pcBaseFrame = &animParser.mBaseFrames[0];

                for (AnimBoneArray::const_iterator iter2 = animParser.mAnimatedBones.begin(); iter2 != animParser.mAnimatedBones.end(); ++iter2,

                                                  ++pcAnimNode, ++pcBaseFrame) {

                    if ((*iter2).iFirstKeyIndex >= (*iter).mValues.size()) {

                        // Allow for empty frames

                        if ((*iter2).iFlags != 0) {

                            throw DeadlyImportError("MD5: Keyframe index is out of range");

                        }

                        continue;

                    }

                    const float *fpCur = &(*iter).mValues[(*iter2).iFirstKeyIndex];

                    aiNodeAnim *pcCurAnimBone = *pcAnimNode;

                    aiVectorKey *vKey = &pcCurAnimBone->mPositionKeys[pcCurAnimBone->mNumPositionKeys++];

                    aiQuatKey *qKey = &pcCurAnimBone->mRotationKeys[pcCurAnimBone->mNumRotationKeys++];

                    aiVector3D vTemp;

                    // translational component

                    for (unsigned int i = 0; i < 3; ++i) {

                        if ((*iter2).iFlags & (1u << i)) {

                            vKey->mValue[i] = *fpCur++;

                        } else

                            vKey->mValue[i] = pcBaseFrame->vPositionXYZ[i];

                    }

                    // orientation component

                    for (unsigned int i = 0; i < 3; ++i) {

                        if ((*iter2).iFlags & (8u << i)) {

                            vTemp[i] = *fpCur++;

                        } else

                            vTemp[i] = pcBaseFrame->vRotationQuat[i];

                    }

                    MD5::ConvertQuaternion(vTemp, qKey->mValue);

                    qKey->mTime = vKey->mTime = dTime;

                }

            }

            // compute the duration of the animation

            anim->mDuration = std::max(dTime, anim->mDuration);

        }

        // If we didn't build the hierarchy yet (== we didn't load a MD5MESH),

        // construct it now from the data given in the MD5ANIM.

        if (!mScene->mRootNode) {

            mScene->mRootNode = new aiNode();

            mScene->mRootNode->mName.Set("<MD5_Hierarchy>");

            AttachChilds_Anim(-1, mScene->mRootNode, animParser.mAnimatedBones, (const aiNodeAnim **)anim->mChannels);

            // Call SkeletonMeshBuilder to construct a mesh to represent the shape

            if (mScene->mRootNode->mNumChildren) {

                SkeletonMeshBuilder skeleton_maker(mScene, mScene->mRootNode->mChildren[0]);

            }

        }

    }

}

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

// Load an MD5CAMERA file

void MD5Importer::LoadMD5CameraFile() {

    std::string pFile = mFile + "md5camera";

    std::unique_ptr<IOStream> file(mIOHandler->Open(pFile, "rb"));

    // Check whether we can read from the file

    if (!file || !file->FileSize()) {

        throw DeadlyImportError("Failed to read MD5CAMERA file: ", pFile);

    }

    mHadMD5Camera = true;

    LoadFileIntoMemory(file.get());

    // parse the basic file structure

    MD5::MD5Parser parser(mBuffer, mFileSize);

    // load the camera animation data from the parse tree

    MD5::MD5CameraParser cameraParser(parser.mSections);

    if (cameraParser.frames.empty()) {

        throw DeadlyImportError("MD5CAMERA: No frames parsed");

    }

    std::vector<unsigned int> &cuts = cameraParser.cuts;

    std::vector<MD5::CameraAnimFrameDesc> &frames = cameraParser.frames;

    // Construct output graph - a simple root with a dummy child.

    // The root node performs the coordinate system conversion

    aiNode *root = mScene->mRootNode = new aiNode("<MD5CameraRoot>");

    root->mChildren = new aiNode *[root->mNumChildren = 1];

    root->mChildren[0] = new aiNode("<MD5Camera>");

    root->mChildren[0]->mParent = root;

    // ... but with one camera assigned to it

    mScene->mCameras = new aiCamera *[mScene->mNumCameras = 1];

    aiCamera *cam = mScene->mCameras[0] = new aiCamera();

    cam->mName = "<MD5Camera>";

    // FIXME: Fov is currently set to the first frame's value

    cam->mHorizontalFOV = AI_DEG_TO_RAD(frames.front().fFOV);

    // every cut is written to a separate aiAnimation

    if (!cuts.size()) {

        cuts.push_back(0);

        cuts.push_back(static_cast<unsigned int>(frames.size() - 1));

    } else {

        cuts.insert(cuts.begin(), 0);

        if (cuts.back() < frames.size() - 1)

            cuts.push_back(static_cast<unsigned int>(frames.size() - 1));

    }

    // Cut indices come straight from the file and are used to index into

    // frames; reject any range that runs past the end (or wraps) before we

    // allocate or read anything, so a mid-loop throw can't leave the scene

    // holding half-initialized animations.

    for (auto it = cuts.begin(); it != cuts.end() - 1; ++it) {

        if (*(it + 1) < *it || *(it + 1) > frames.size()) {

            throw DeadlyImportError("MD5CAMERA: Cut references a frame out of range");

        }

    }

    mScene->mNumAnimations = static_cast<unsigned int>(cuts.size() - 1);

    aiAnimation **tmp = mScene->mAnimations = new aiAnimation *[mScene->mNumAnimations];

    for (std::vector<unsigned int>::const_iterator it = cuts.begin(); it != cuts.end() - 1; ++it) {

        aiAnimation *anim = *tmp++ = new aiAnimation();

        anim->mName.length = ::ai_snprintf(anim->mName.data, AI_MAXLEN, "anim%u_from_%u_to_%u", (unsigned int)(it - cuts.begin()), (*it), *(it + 1));

        anim->mTicksPerSecond = cameraParser.fFrameRate;

        anim->mChannels = new aiNodeAnim *[anim->mNumChannels = 1];

        aiNodeAnim *nd = anim->mChannels[0] = new aiNodeAnim();

        nd->mNodeName.Set("<MD5Camera>");

        const unsigned int firstFrame = *it;

        const unsigned int lastFrame = *(it + 1);

        nd->mNumPositionKeys = nd->mNumRotationKeys = lastFrame - firstFrame;

        nd->mPositionKeys = new aiVectorKey[nd->mNumPositionKeys];

        nd->mRotationKeys = new aiQuatKey[nd->mNumRotationKeys];

        for (unsigned int i = 0; i < nd->mNumPositionKeys; ++i) {

            nd->mPositionKeys[i].mValue = frames[firstFrame + i].vPositionXYZ;

            MD5::ConvertQuaternion(frames[firstFrame + i].vRotationQuat, nd->mRotationKeys[i].mValue);

            nd->mPositionKeys[i].mTime = firstFrame + i;

            nd->mRotationKeys[i].mTime = nd->mPositionKeys[i].mTime;

        }

    }

}

#endif // !! ASSIMP_BUILD_NO_MD5_IMPORTER