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/** @file  MS3DLoader.cpp

 *  @brief Implementation of the Ms3D importer class.

 *  Written against http://chumbalum.swissquake.ch/ms3d/ms3dspec.txt

 */

#ifndef ASSIMP_BUILD_NO_MS3D_IMPORTER

// internal headers

#include "MS3DLoader.h"

#include <assimp/StreamReader.h>

#include <assimp/DefaultLogger.hpp>

#include <assimp/scene.h>

#include <assimp/IOSystem.hpp>

#include <assimp/importerdesc.h>

#include <map>

using namespace Assimp;

static constexpr aiImporterDesc desc = {

    "Milkshape 3D Importer",

    "",

    "",

    "http://chumbalum.swissquake.ch/",

    aiImporterFlags_SupportBinaryFlavour,

    0,

    0,

    0,

    0,

    "ms3d"

};

// ASSIMP_BUILD_MS3D_ONE_NODE_PER_MESH

//   (enable old code path, which generates extra nodes per mesh while

//    the newer code uses aiMesh::mName to express the name of the

//    meshes (a.k.a. groups in MS3D))

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

// Constructor to be privately used by Importer

MS3DImporter::MS3DImporter()

    : mScene()

{}

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

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

bool MS3DImporter::CanRead( const std::string& pFile, IOSystem* pIOHandler, bool /*checkSig*/) const

{

    static const char* tokens[] = { "MS3D000000" };

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

}

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

const aiImporterDesc* MS3DImporter::GetInfo () const

{

    return &desc;

}

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

void ReadColor(StreamReaderLE& stream, aiColor4D& ambient)

{

    // aiColor4D is packed on gcc, implicit binding to float& fails therefore.

    stream >> (float&)ambient.r >> (float&)ambient.g >> (float&)ambient.b >> (float&)ambient.a;

}

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

void ReadVector(StreamReaderLE& stream, aiVector3D& pos)

{

    // See note in ReadColor()

    stream >> (float&)pos.x >> (float&)pos.y >> (float&)pos.z;

}

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

template<typename T>

void MS3DImporter :: ReadComments(StreamReaderLE& stream, std::vector<T>& outp)

{

    uint16_t cnt;

    stream >> cnt;

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

        uint32_t index, clength;

        stream >> index >> clength;

        if(index >= outp.size()) {

            ASSIMP_LOG_WARN("MS3D: Invalid index in comment section");

        }

        else if (clength > stream.GetRemainingSize()) {

            throw DeadlyImportError("MS3D: Failure reading comment, length field is out of range");

        }

        else {

            outp[index].comment = std::string(reinterpret_cast<char*>(stream.GetPtr()),clength);

        }

        stream.IncPtr(clength);

    }

}

Unexecuted instantiation: void Assimp::MS3DImporter::ReadComments<Assimp::MS3DImporter::TempGroup>(Assimp::StreamReader<false, false>&, std::__1::vector<Assimp::MS3DImporter::TempGroup, std::__1::allocator<Assimp::MS3DImporter::TempGroup> >&)

Unexecuted instantiation: void Assimp::MS3DImporter::ReadComments<Assimp::MS3DImporter::TempMaterial>(Assimp::StreamReader<false, false>&, std::__1::vector<Assimp::MS3DImporter::TempMaterial, std::__1::allocator<Assimp::MS3DImporter::TempMaterial> >&)

Unexecuted instantiation: void Assimp::MS3DImporter::ReadComments<Assimp::MS3DImporter::TempJoint>(Assimp::StreamReader<false, false>&, std::__1::vector<Assimp::MS3DImporter::TempJoint, std::__1::allocator<Assimp::MS3DImporter::TempJoint> >&)

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

template <typename T, typename T2, typename T3> bool inrange(const T& in, const T2& lower, const T3& higher)

{

    return in > lower && in <= higher;

}

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

void MS3DImporter :: CollectChildJoints(const std::vector<TempJoint>& joints,

    std::vector<bool>& hadit,

    aiNode* nd,

    const aiMatrix4x4& absTrafo)

{

    unsigned int cnt = 0;

    for(size_t i = 0; i < joints.size(); ++i) {

        if (!hadit[i] && !strcmp(joints[i].parentName,nd->mName.data)) {

            ++cnt;

        }

    }

    nd->mChildren = new aiNode*[nd->mNumChildren = cnt];

    cnt = 0;

    for(size_t i = 0; i < joints.size(); ++i) {

        if (!hadit[i] && !strcmp(joints[i].parentName,nd->mName.data)) {

            aiNode* ch = nd->mChildren[cnt++] = new aiNode(joints[i].name);

            ch->mParent = nd;

            ch->mTransformation = aiMatrix4x4::Translation(joints[i].position,aiMatrix4x4()=aiMatrix4x4())*

                aiMatrix4x4().FromEulerAnglesXYZ(joints[i].rotation);

            const aiMatrix4x4 abs = absTrafo*ch->mTransformation;

            for(unsigned int a = 0; a < mScene->mNumMeshes; ++a) {

                aiMesh* const msh = mScene->mMeshes[a];

                for(unsigned int n = 0; n < msh->mNumBones; ++n) {

                    aiBone* const bone = msh->mBones[n];

                    if(bone->mName == ch->mName) {

                        bone->mOffsetMatrix = aiMatrix4x4(abs).Inverse();

                    }

                }

            }

            hadit[i] = true;

            CollectChildJoints(joints,hadit,ch,abs);

        }

    }

}

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

void MS3DImporter :: CollectChildJoints(const std::vector<TempJoint>& joints, aiNode* nd)

{

     std::vector<bool> hadit(joints.size(),false);

     aiMatrix4x4 trafo;

     CollectChildJoints(joints,hadit,nd,trafo);

}

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

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

void MS3DImporter::InternReadFile( const std::string& pFile,

    aiScene* pScene, IOSystem* pIOHandler)

{

    auto file = pIOHandler->Open(pFile, "rb");

    if (!file)

        throw DeadlyImportError("MS3D: Could not open ", pFile);

    StreamReaderLE stream(file);

    // CanRead() should have done this already

    char head[10];

    int32_t version;

    mScene = pScene;

    // 1 ------------ read into temporary data structures mirroring the original file

    stream.CopyAndAdvance(head,10);

    stream >> version;

    if (strncmp(head,"MS3D000000",10)) {

        throw DeadlyImportError("Not a MS3D file, magic string MS3D000000 not found: ", pFile);

    }

    if (version != 4) {

        throw DeadlyImportError("MS3D: Unsupported file format version, 4 was expected");

    }

    uint16_t verts;

    stream >> verts;

    std::vector<TempVertex> vertices(verts);

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

        TempVertex& v = vertices[i];

        stream.IncPtr(1);

        ReadVector(stream,v.pos);

        v.bone_id[0] = stream.GetI1();

        v.ref_cnt = stream.GetI1();

        v.bone_id[1] = v.bone_id[2] = v.bone_id[3] = UINT_MAX;

        v.weights[1] = v.weights[2] = v.weights[3] = 0.f;

        v.weights[0] = 1.f;

    }

    uint16_t tris;

    stream >> tris;

    std::vector<TempTriangle> triangles(tris);

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

        TempTriangle& t = triangles[i];

        stream.IncPtr(2);

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

            t.indices[j] = stream.GetI2();

        }

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

            ReadVector(stream,t.normals[j]);

        }

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

            stream >> (float&)(t.uv[j].x); // see note in ReadColor()

        }

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

            stream >> (float&)(t.uv[j].y);

        }

        t.sg    = stream.GetI1();

        t.group = stream.GetI1();

    }

    uint16_t grp;

    stream >> grp;

    bool need_default = false;

    std::vector<TempGroup> groups(grp);

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

        TempGroup& t = groups[i];

        stream.IncPtr(1);

        stream.CopyAndAdvance(t.name,32);

        t.name[32] = '\0';

        uint16_t num;

        stream >> num;

        t.triangles.resize(num);

        for (unsigned int j = 0; j < num; ++j) {

            t.triangles[j] = stream.GetI2();

        }

        t.mat = stream.GetI1();

        if (t.mat == UINT_MAX) {

            need_default = true;

        }

    }

    uint16_t mat;

    stream >> mat;

    std::vector<TempMaterial> materials(mat);

    for (unsigned int j = 0;j < mat; ++j) {

        TempMaterial& t = materials[j];

        stream.CopyAndAdvance(t.name,32);

        t.name[32] = '\0';

        ReadColor(stream,t.ambient);

        ReadColor(stream,t.diffuse);

        ReadColor(stream,t.specular);

        ReadColor(stream,t.emissive);

        stream >> t.shininess  >> t.transparency;

        stream.IncPtr(1);

        stream.CopyAndAdvance(t.texture,128);

        t.texture[128] = '\0';

        stream.CopyAndAdvance(t.alphamap,128);

        t.alphamap[128] = '\0';

    }

    float animfps, currenttime;

    uint32_t totalframes;

    stream >> animfps >> currenttime >> totalframes;

    uint16_t joint;

    stream >> joint;

    std::vector<TempJoint> joints(joint);

    for(unsigned int ii = 0; ii < joint; ++ii) {

        TempJoint& j = joints[ii];

        stream.IncPtr(1);

        stream.CopyAndAdvance(j.name,32);

        j.name[32] = '\0';

        stream.CopyAndAdvance(j.parentName,32);

        j.parentName[32] = '\0';

        ReadVector(stream,j.rotation);

        ReadVector(stream,j.position);

        j.rotFrames.resize(stream.GetI2());

        j.posFrames.resize(stream.GetI2());

        for(unsigned int a = 0; a < j.rotFrames.size(); ++a) {

            TempKeyFrame& kf = j.rotFrames[a];

            stream >> kf.time;

            ReadVector(stream,kf.value);

        }

        for(unsigned int a = 0; a < j.posFrames.size(); ++a) {

            TempKeyFrame& kf = j.posFrames[a];

            stream >> kf.time;

            ReadVector(stream,kf.value);

        }

    }

    if(stream.GetRemainingSize() > 4) {

        uint32_t subversion;

        stream >> subversion;

        if (subversion == 1) {

            ReadComments<TempGroup>(stream,groups);

            ReadComments<TempMaterial>(stream,materials);

            ReadComments<TempJoint>(stream,joints);

            // model comment - print it for we have such a nice log.

            if (stream.GetI4()) {

                const size_t len = static_cast<size_t>(stream.GetI4());

                if (len > stream.GetRemainingSize()) {

                    throw DeadlyImportError("MS3D: Model comment is too long");

                }

                const std::string& s = std::string(reinterpret_cast<char*>(stream.GetPtr()),len);

                ASSIMP_LOG_DEBUG("MS3D: Model comment: ", s);

            }

            if(stream.GetRemainingSize() > 4 && inrange((stream >> subversion,subversion),1u,3u)) {

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

                    TempVertex& v = vertices[i];

                    v.weights[3]=1.f;

                    for(unsigned int n = 0; n < 3; v.weights[3]-=v.weights[n++]) {

                        v.bone_id[n+1] = stream.GetI1();

                        v.weights[n] = static_cast<float>(static_cast<unsigned int>(stream.GetI1()))/255.f;

                    }

                    stream.IncPtr((subversion-1)<<2u);

                }

                // even further extra data is not of interest for us, at least now now.

            }

        }

    }

    // 2 ------------ convert to proper aiXX data structures -----------------------------------

    if (need_default && materials.size()) {

        ASSIMP_LOG_WARN("MS3D: Found group with no material assigned, spawning default material");

        // if one of the groups has no material assigned, but there are other

        // groups with materials, a default material needs to be added (

        // scenepreprocessor adds a default material only if nummat==0).

        materials.emplace_back();

        TempMaterial& m = materials.back();

        strcpy(m.name,"<MS3D_DefaultMat>");

        m.diffuse = aiColor4D(0.6f,0.6f,0.6f,1.0);

        m.transparency = 1.f;

        m.shininess = 0.f;

        // this is because these TempXXX struct's have no c'tors.

        m.texture[0] = m.alphamap[0] = '\0';

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

            TempGroup& g = groups[i];

            if (g.mat == UINT_MAX) {

                g.mat = static_cast<unsigned int>(materials.size()-1);

            }

        }

    }

    // convert materials to our generic key-value dict-alike

    if (materials.size()) {

        pScene->mMaterials = new aiMaterial*[materials.size()];

        for (size_t i = 0; i < materials.size(); ++i) {

            aiMaterial* mo = new aiMaterial();

            pScene->mMaterials[pScene->mNumMaterials++] = mo;

            const TempMaterial& mi = materials[i];

            aiString tmp;

            if (0[mi.alphamap]) {

                tmp = aiString(mi.alphamap);

                mo->AddProperty(&tmp,AI_MATKEY_TEXTURE_OPACITY(0));

            }

            if (0[mi.texture]) {

                tmp = aiString(mi.texture);

                mo->AddProperty(&tmp,AI_MATKEY_TEXTURE_DIFFUSE(0));

            }

            if (0[mi.name]) {

                tmp = aiString(mi.name);

                mo->AddProperty(&tmp,AI_MATKEY_NAME);

            }

            mo->AddProperty(&mi.ambient,1,AI_MATKEY_COLOR_AMBIENT);

            mo->AddProperty(&mi.diffuse,1,AI_MATKEY_COLOR_DIFFUSE);

            mo->AddProperty(&mi.specular,1,AI_MATKEY_COLOR_SPECULAR);

            mo->AddProperty(&mi.emissive,1,AI_MATKEY_COLOR_EMISSIVE);

            mo->AddProperty(&mi.shininess,1,AI_MATKEY_SHININESS);

            mo->AddProperty(&mi.transparency,1,AI_MATKEY_OPACITY);

            const int sm = mi.shininess>0.f?aiShadingMode_Phong:aiShadingMode_Gouraud;

            mo->AddProperty(&sm,1,AI_MATKEY_SHADING_MODEL);

        }

    }

    // convert groups to meshes

    if (groups.empty()) {

        throw DeadlyImportError("MS3D: Didn't get any group records, file is malformed");

    }

    pScene->mMeshes = new aiMesh*[pScene->mNumMeshes=static_cast<unsigned int>(groups.size())]();

    for (unsigned int i = 0; i < pScene->mNumMeshes; ++i) {

        aiMesh* m = pScene->mMeshes[i] = new aiMesh();

        const TempGroup& g = groups[i];

        if (pScene->mNumMaterials && g.mat > pScene->mNumMaterials) {

            throw DeadlyImportError("MS3D: Encountered invalid material index, file is malformed");

        } // no error if no materials at all - scenepreprocessor adds one then

        m->mMaterialIndex  = g.mat;

        m->mPrimitiveTypes = aiPrimitiveType_TRIANGLE;

        m->mFaces = new aiFace[m->mNumFaces = static_cast<unsigned int>(g.triangles.size())];

        m->mNumVertices = m->mNumFaces*3;

        // storage for vertices - verbose format, as requested by the postprocessing pipeline

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

        m->mNormals  = new aiVector3D[m->mNumVertices];

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

        m->mNumUVComponents[0] = 2;

        typedef std::map<unsigned int,unsigned int> BoneSet;

        BoneSet mybones;

        for (unsigned int j = 0,n = 0; j < m->mNumFaces; ++j) {

            aiFace& f = m->mFaces[j];

            if (g.triangles[j] >= triangles.size()) {

                throw DeadlyImportError("MS3D: Encountered invalid triangle index, file is malformed");

            }

            TempTriangle& t = triangles[g.triangles[j]];

            f.mIndices = new unsigned int[f.mNumIndices=3];

            for (unsigned int k = 0; k < 3; ++k,++n) {

                if (t.indices[k] >= vertices.size()) {

                    throw DeadlyImportError("MS3D: Encountered invalid vertex index, file is malformed");

                }

                const TempVertex& v = vertices[t.indices[k]];

                for(unsigned int a = 0; a < 4; ++a) {

                    if (v.bone_id[a] != UINT_MAX) {

                        if (v.bone_id[a] >= joints.size()) {

                            throw DeadlyImportError("MS3D: Encountered invalid bone index, file is malformed");

                        }

                        if (mybones.find(v.bone_id[a]) == mybones.end()) {

                             mybones[v.bone_id[a]] = 1;

                        }

                        else ++mybones[v.bone_id[a]];

                    }

                }

                // collect vertex components

                m->mVertices[n] = v.pos;

                m->mNormals[n] = t.normals[k];

                m->mTextureCoords[0][n] = aiVector3D(t.uv[k].x,1.f-t.uv[k].y,0.0);

                f.mIndices[k] = n;

            }

        }

        // allocate storage for bones

        if(!mybones.empty()) {

            std::vector<unsigned int> bmap(joints.size());

            m->mBones = new aiBone*[mybones.size()]();

            for(BoneSet::const_iterator it = mybones.begin(); it != mybones.end(); ++it) {

                aiBone* const bn = m->mBones[m->mNumBones] = new aiBone();

                const TempJoint& jnt = joints[(*it).first];

                bn->mName.Set(jnt.name);

                bn->mWeights = new aiVertexWeight[(*it).second];

                bmap[(*it).first] = m->mNumBones++;

            }

            // .. and collect bone weights

            for (unsigned int j = 0,n = 0; j < m->mNumFaces; ++j) {

                TempTriangle& t = triangles[g.triangles[j]];

                for (unsigned int k = 0; k < 3; ++k,++n) {

                    const TempVertex& v = vertices[t.indices[k]];

                    for(unsigned int a = 0; a < 4; ++a) {

                        const unsigned int bone = v.bone_id[a];

                        if(bone==UINT_MAX){

                            continue;

                        }

                        aiBone* const outbone = m->mBones[bmap[bone]];

                        aiVertexWeight& outwght = outbone->mWeights[outbone->mNumWeights++];

                        outwght.mVertexId = n;

                        outwght.mWeight = v.weights[a];

                    }

                }

            }

        }

    }

    // ... add dummy nodes under a single root, each holding a reference to one

    // mesh. If we didn't do this, we'd lose the group name.

    aiNode* rt = pScene->mRootNode = new aiNode("<MS3DRoot>");

#ifdef ASSIMP_BUILD_MS3D_ONE_NODE_PER_MESH

    rt->mChildren = new aiNode*[rt->mNumChildren=pScene->mNumMeshes+(joints.size()?1:0)]();

    for (unsigned int i = 0; i < pScene->mNumMeshes; ++i) {

        aiNode* nd = rt->mChildren[i] = new aiNode();

        const TempGroup& g = groups[i];

        // we need to generate an unique name for all mesh nodes.

        // since we want to keep the group name, a prefix is

        // prepended.

        nd->mName = aiString("<MS3DMesh>_");

        nd->mName.Append(g.name);

        nd->mParent = rt;

        nd->mMeshes = new unsigned int[nd->mNumMeshes = 1];

        nd->mMeshes[0] = i;

    }

#else

    rt->mMeshes = new unsigned int[pScene->mNumMeshes];

    for (unsigned int i = 0; i < pScene->mNumMeshes; ++i) {

        rt->mMeshes[rt->mNumMeshes++] = i;

    }

#endif

    // convert animations as well

    if(joints.size()) {

#ifndef ASSIMP_BUILD_MS3D_ONE_NODE_PER_MESH

        rt->mChildren = new aiNode*[1]();

        rt->mNumChildren = 1;

        aiNode* jt = rt->mChildren[0] = new aiNode();

#else

        aiNode* jt = rt->mChildren[pScene->mNumMeshes] = new aiNode();

#endif

        jt->mParent = rt;

        CollectChildJoints(joints,jt);

        jt->mName.Set("<MS3DJointRoot>");

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

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

        anim->mName.Set("<MS3DMasterAnim>");

        // carry the fps info to the user by scaling all times with it

        anim->mTicksPerSecond = animfps;

        // leave duration at its default, so ScenePreprocessor will fill an appropriate

        // value (the values taken from some MS3D files seem to be too unreliable

        // to pass the validation)

        // anim->mDuration = totalframes/animfps;

        anim->mChannels = new aiNodeAnim*[joints.size()]();

        for(std::vector<TempJoint>::const_iterator it = joints.begin(); it != joints.end(); ++it) {

            if ((*it).rotFrames.empty() && (*it).posFrames.empty()) {

                continue;

            }

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

            nd->mNodeName.Set((*it).name);

            if ((*it).rotFrames.size()) {

                nd->mRotationKeys = new aiQuatKey[(*it).rotFrames.size()];

                for(std::vector<TempKeyFrame>::const_iterator rot = (*it).rotFrames.begin(); rot != (*it).rotFrames.end(); ++rot) {

                    aiQuatKey& q = nd->mRotationKeys[nd->mNumRotationKeys++];

                    q.mTime = (*rot).time*animfps;

                    q.mValue = aiQuaternion(aiMatrix3x3(aiMatrix4x4().FromEulerAnglesXYZ((*it).rotation)*

                        aiMatrix4x4().FromEulerAnglesXYZ((*rot).value)));

                }

            }

            if ((*it).posFrames.size()) {

                nd->mPositionKeys = new aiVectorKey[(*it).posFrames.size()];

                aiQuatKey* qu = nd->mRotationKeys;

                for(std::vector<TempKeyFrame>::const_iterator pos = (*it).posFrames.begin(); pos != (*it).posFrames.end(); ++pos,++qu) {

                    aiVectorKey& v = nd->mPositionKeys[nd->mNumPositionKeys++];

                    v.mTime = (*pos).time*animfps;

                    v.mValue = (*it).position + (*pos).value;

                }

            }

        }

        // fixup to pass the validation if not a single animation channel is non-trivial

        if (!anim->mNumChannels) {

            anim->mChannels = nullptr;

        }

    }

}

#endif