/src/assimp/code/AssetLib/FBX/FBXDocument.cpp

Source
/*
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*/

/** @file  FBXDocument.cpp
 *  @brief Implementation of the FBX DOM classes
 */

#ifndef ASSIMP_BUILD_NO_FBX_IMPORTER

#include "FBXDocument.h"
#include "FBXMeshGeometry.h"
#include "FBXParser.h"
#include "FBXUtil.h"
#include "FBXImporter.h"
#include "FBXImportSettings.h"
#include "FBXDocumentUtil.h"
#include "FBXProperties.h"

#include <assimp/DefaultLogger.hpp>

#include <functional>
#include <map>
#include <memory>
#include <utility>

namespace Assimp {
namespace FBX {

using namespace Util;

// ------------------------------------------------------------------------------------------------
LazyObject::LazyObject(uint64_t id, const Element& element, const Document& doc) :
        doc(doc), element(element), id(id), flags() {
    // empty
}

// ------------------------------------------------------------------------------------------------
const Object* LazyObject::Get(bool dieOnError) {
    if(IsBeingConstructed() || FailedToConstruct()) {
        return nullptr;
    }

    if (object) {
        return object.get();
    }

    const Token& key = element.KeyToken();
    const TokenList& tokens = element.Tokens();

    if(tokens.size() < 3) {
        DOMError("expected at least 3 tokens: id, name and class tag",&element);
    }

    const char* err;
    std::string name = ParseTokenAsString(*tokens[1],err);
    if (err) {
        DOMError(err,&element);
    }

    // small fix for binary reading: binary fbx files don't use
    // prefixes such as Model:: in front of their names. The
    // loading code expects this at many places, though!
    // so convert the binary representation (a 0x0001) to the
    // double colon notation.
    if(tokens[1]->IsBinary()) {
        for (size_t i = 0; i < name.length(); ++i) {
            if (name[i] == 0x0 && name[i+1] == 0x1) {
                name = name.substr(i+2) + "::" + name.substr(0,i);
            }
        }
    }

    const std::string classtag = ParseTokenAsString(*tokens[2],err);
    if (err) {
        DOMError(err,&element);
    }

    // prevent recursive calls
    flags |= BEING_CONSTRUCTED;

    try {
        // this needs to be relatively fast since it happens a lot,
        // so avoid constructing strings all the time.
        const char* obtype = key.begin();
        const size_t length = static_cast<size_t>(key.end()-key.begin());

        // For debugging
        //dumpObjectClassInfo( objtype, classtag );

        if (!strncmp(obtype,"Geometry",length)) {
            if (!strcmp(classtag.c_str(),"Mesh")) {
                object.reset(new MeshGeometry(id,element,name,doc));
            }
            if (!strcmp(classtag.c_str(), "Shape")) {
                object.reset(new ShapeGeometry(id, element, name, doc));
            }
            if (!strcmp(classtag.c_str(), "Line")) {
                object.reset(new LineGeometry(id, element, name, doc));
            }
        }
        else if (!strncmp(obtype,"NodeAttribute",length)) {
            if (!strcmp(classtag.c_str(),"Camera")) {
                object.reset(new Camera(id,element,doc,name));
            }
            else if (!strcmp(classtag.c_str(),"CameraSwitcher")) {
                object.reset(new CameraSwitcher(id,element,doc,name));
            }
            else if (!strcmp(classtag.c_str(),"Light")) {
                object.reset(new Light(id,element,doc,name));
            }
            else if (!strcmp(classtag.c_str(),"Null")) {
                object.reset(new Null(id,element,doc,name));
            }
            else if (!strcmp(classtag.c_str(),"LimbNode")) {
                object.reset(new LimbNode(id,element,doc,name));
            }
        }
        else if (!strncmp(obtype,"Deformer",length)) {
            if (!strcmp(classtag.c_str(),"Cluster")) {
                object.reset(new Cluster(id,element,doc,name));
            }
            else if (!strcmp(classtag.c_str(),"Skin")) {
                object.reset(new Skin(id,element,doc,name));
            }
            else if (!strcmp(classtag.c_str(), "BlendShape")) {
                object.reset(new BlendShape(id, element, doc, name));
            }
            else if (!strcmp(classtag.c_str(), "BlendShapeChannel")) {
                object.reset(new BlendShapeChannel(id, element, doc, name));
            }
        }
        else if ( !strncmp( obtype, "Model", length ) ) {
            // FK and IK effectors are not supported
            if ( strcmp( classtag.c_str(), "IKEffector" ) && strcmp( classtag.c_str(), "FKEffector" ) ) {
                object.reset( new Model( id, element, doc, name ) );
            }
        }
        else if (!strncmp(obtype,"Material",length)) {
            object.reset(new Material(id,element,doc,name));
        }
        else if (!strncmp(obtype,"Texture",length)) {
            object.reset(new Texture(id,element,doc,name));
        }
        else if (!strncmp(obtype,"LayeredTexture",length)) {
            object.reset(new LayeredTexture(id,element,doc,name));
        }
        else if (!strncmp(obtype,"Video",length)) {
            object.reset(new Video(id,element,doc,name));
        }
        else if (!strncmp(obtype,"AnimationStack",length)) {
            object.reset(new AnimationStack(id,element,name,doc));
        }
        else if (!strncmp(obtype,"AnimationLayer",length)) {
            object.reset(new AnimationLayer(id,element,name,doc));
        }
        // note: order matters for these two
        else if (!strncmp(obtype,"AnimationCurve",length)) {
            object.reset(new AnimationCurve(id,element,name,doc));
        }
        else if (!strncmp(obtype,"AnimationCurveNode",length)) {
            object.reset(new AnimationCurveNode(id,element,name,doc));
        }
    }
    catch (std::bad_alloc&) {
        // out-of-memory is unrecoverable and should always lead to a failure

        flags &= ~BEING_CONSTRUCTED;
        flags |= FAILED_TO_CONSTRUCT;

        throw;
    }
    catch(std::exception& ex) {
        flags &= ~BEING_CONSTRUCTED;
        flags |= FAILED_TO_CONSTRUCT;

        if(dieOnError || doc.Settings().strictMode) {
            throw;
        }

        // note: the error message is already formatted, so raw logging is ok
        if(!DefaultLogger::isNullLogger()) {
            ASSIMP_LOG_ERROR(ex.what());
        }
        return nullptr;
    }

    if (!object) {
        //DOMError("failed to convert element to DOM object, class: " + classtag + ", name: " + name,&element);
    }

    flags &= ~BEING_CONSTRUCTED;
    return object.get();
}

// ------------------------------------------------------------------------------------------------
Object::Object(uint64_t id, const Element& element, const std::string& name) :
        element(element), name(name), id(id) {
    // empty
}

// ------------------------------------------------------------------------------------------------
FileGlobalSettings::FileGlobalSettings(const Document &doc, std::shared_ptr<const PropertyTable> props) :
        props(std::move(props)), doc(doc) {
    // empty
}

// ------------------------------------------------------------------------------------------------
Document::Document(Parser& parser, const ImportSettings& settings) :
     settings(settings), parser(parser) {
  ASSIMP_LOG_DEBUG("Creating FBX Document");

    // Cannot use array default initialization syntax because vc8 fails on it
    for (auto &timeStamp : creationTimeStamp) {
        timeStamp = 0;
    }

    ReadHeader();
    ReadPropertyTemplates();

    ReadGlobalSettings();

    // This order is important, connections need parsed objects to check
    // whether connections are ok or not. Objects may not be evaluated yet,
    // though, since this may require valid connections.
    ReadObjects();
    ReadConnections();
}

// ------------------------------------------------------------------------------------------------
Document::~Document()
{
  // The document does not own the memory for the following objects, but we need to call their d'tor
  // so they can properly free memory like string members:

    for (ObjectMap::value_type &v : objects) {
        delete_LazyObject(v.second);
    }

    for (ConnectionMap::value_type &v : src_connections) {
        delete_Connection(v.second);
    }
    // |dest_connections| contain the same Connection objects as the |src_connections|
}

// ------------------------------------------------------------------------------------------------
static const unsigned int LowerSupportedVersion = 7100;
static const unsigned int UpperSupportedVersion = 7400;

void Document::ReadHeader() {
    // Read ID objects from "Objects" section
    const Scope& sc = parser.GetRootScope();
    const Element* const ehead = sc["FBXHeaderExtension"];
    if(!ehead || !ehead->Compound()) {
        DOMError("no FBXHeaderExtension dictionary found");
    }

    const Scope& shead = *ehead->Compound();
    fbxVersion = ParseTokenAsInt(GetRequiredToken(GetRequiredElement(shead,"FBXVersion",ehead),0));
  ASSIMP_LOG_DEBUG("FBX Version: ", fbxVersion);

    // While we may have some success with newer files, we don't support
    // the older 6.n fbx format
    if(fbxVersion < LowerSupportedVersion ) {
        DOMError("unsupported, old format version, supported are only FBX 2011, FBX 2012 and FBX 2013");
    }
    if(fbxVersion > UpperSupportedVersion ) {
        if(Settings().strictMode) {
            DOMError("unsupported, newer format version, supported are only FBX 2011, FBX 2012 and FBX 2013"
                " (turn off strict mode to try anyhow) ");
        }
        else {
            DOMWarning("unsupported, newer format version, supported are only FBX 2011, FBX 2012 and FBX 2013,"
                " trying to read it nevertheless");
        }
    }

    const Element* const ecreator = shead["Creator"];
    if(ecreator) {
        creator = ParseTokenAsString(GetRequiredToken(*ecreator,0));
    }

    const Element* const etimestamp = shead["CreationTimeStamp"];
    if(etimestamp && etimestamp->Compound()) {
        const Scope& stimestamp = *etimestamp->Compound();
        creationTimeStamp[0] = ParseTokenAsInt(GetRequiredToken(GetRequiredElement(stimestamp,"Year"),0));
        creationTimeStamp[1] = ParseTokenAsInt(GetRequiredToken(GetRequiredElement(stimestamp,"Month"),0));
        creationTimeStamp[2] = ParseTokenAsInt(GetRequiredToken(GetRequiredElement(stimestamp,"Day"),0));
        creationTimeStamp[3] = ParseTokenAsInt(GetRequiredToken(GetRequiredElement(stimestamp,"Hour"),0));
        creationTimeStamp[4] = ParseTokenAsInt(GetRequiredToken(GetRequiredElement(stimestamp,"Minute"),0));
        creationTimeStamp[5] = ParseTokenAsInt(GetRequiredToken(GetRequiredElement(stimestamp,"Second"),0));
        creationTimeStamp[6] = ParseTokenAsInt(GetRequiredToken(GetRequiredElement(stimestamp,"Millisecond"),0));
    }
}

// ------------------------------------------------------------------------------------------------
void Document::ReadGlobalSettings() {
    const Scope& sc = parser.GetRootScope();
    const Element* const ehead = sc["GlobalSettings"];
    if ( nullptr == ehead || !ehead->Compound() ) {
        DOMWarning( "no GlobalSettings dictionary found" );
        globals.reset(new FileGlobalSettings(*this, std::make_shared<const PropertyTable>()));
        return;
    }

    std::shared_ptr<const PropertyTable> props = GetPropertyTable( *this, "", *ehead, *ehead->Compound(), true );

    //double v = PropertyGet<float>( *props.get(), std::string("UnitScaleFactor"), 1.0 );

    if(!props) {
        DOMError("GlobalSettings dictionary contains no property table");
    }

    globals.reset(new FileGlobalSettings(*this, std::move(props)));
}

// ------------------------------------------------------------------------------------------------
void Document::ReadObjects() {
    // read ID objects from "Objects" section
    const Scope& sc = parser.GetRootScope();
    const Element* const eobjects = sc["Objects"];
    if(!eobjects || !eobjects->Compound()) {
        DOMError("no Objects dictionary found");
    }

    StackAllocator &allocator = parser.GetAllocator();

    // add a dummy entry to represent the Model::RootNode object (id 0),
    // which is only indirectly defined in the input file
    objects[0] = new_LazyObject(0L, *eobjects, *this);

    const Scope& sobjects = *eobjects->Compound();
    for(const ElementMap::value_type& el : sobjects.Elements()) {

        // extract ID
        const TokenList& tok = el.second->Tokens();

        if (tok.empty()) {
            DOMError("expected ID after object key",el.second);
        }

        const char* err;
        const uint64_t id = ParseTokenAsID(*tok[0], err);
        if(err) {
            DOMError(err,el.second);
        }

        // id=0 is normally implicit
        if(id == 0L) {
            DOMError("encountered object with implicitly defined id 0",el.second);
        }

        const auto foundObject = objects.find(id);
        if(foundObject != objects.end()) {
            DOMWarning("encountered duplicate object id, ignoring first occurrence",el.second);
            delete_LazyObject(foundObject->second);
        }

        objects[id] = new_LazyObject(id, *el.second, *this);

        // grab all animation stacks upfront since there is no listing of them
        if(!strcmp(el.first.c_str(),"AnimationStack")) {
            animationStacks.push_back(id);
        }
    }
}

// ------------------------------------------------------------------------------------------------
void Document::ReadPropertyTemplates() {
    const Scope& sc = parser.GetRootScope();
    // read property templates from "Definitions" section
    const Element* const edefs = sc["Definitions"];
    if(!edefs || !edefs->Compound()) {
        DOMWarning("no Definitions dictionary found");
        return;
    }

    const Scope& sdefs = *edefs->Compound();
    const ElementCollection otypes = sdefs.GetCollection("ObjectType");
    for(ElementMap::const_iterator it = otypes.first; it != otypes.second; ++it) {
        const Element& el = *(*it).second;
        const Scope* curSc = el.Compound();
        if (!curSc) {
            DOMWarning("expected nested scope in ObjectType, ignoring",&el);
            continue;
        }

        const TokenList& tok = el.Tokens();
        if(tok.empty()) {
            DOMWarning("expected name for ObjectType element, ignoring",&el);
            continue;
        }

        const std::string& oname = ParseTokenAsString(*tok[0]);

        const ElementCollection templs = curSc->GetCollection("PropertyTemplate");
        for (ElementMap::const_iterator elemIt = templs.first; elemIt != templs.second; ++elemIt) {
            const Element &innerEl = *(*elemIt).second;
            const Scope *innerSc = innerEl.Compound();
            if (!innerSc) {
                DOMWarning("expected nested scope in PropertyTemplate, ignoring",&el);
                continue;
            }

            const TokenList &curTok = innerEl.Tokens();
            if (curTok.empty()) {
                DOMWarning("expected name for PropertyTemplate element, ignoring",&el);
                continue;
            }

            const std::string &pname = ParseTokenAsString(*curTok[0]);

            const Element *Properties70 = (*innerSc)["Properties70"];
            if(Properties70) {
                std::shared_ptr<const PropertyTable> props = std::make_shared<const PropertyTable>(
                        *Properties70, std::shared_ptr<const PropertyTable>(static_cast<const PropertyTable *>(nullptr))
                );

                templates[oname+"."+pname] = props;
            }
        }
    }
}

// ------------------------------------------------------------------------------------------------
void Document::ReadConnections()
{
    StackAllocator &allocator = parser.GetAllocator();
    const Scope &sc = parser.GetRootScope();
    // read property templates from "Definitions" section
    const Element* const econns = sc["Connections"];
    if(!econns || !econns->Compound()) {
        DOMError("no Connections dictionary found");
    }

    uint64_t insertionOrder = 0l;
    const Scope& sconns = *econns->Compound();
    const ElementCollection conns = sconns.GetCollection("C");
    for(ElementMap::const_iterator it = conns.first; it != conns.second; ++it) {
        const Element& el = *(*it).second;
        const std::string& type = ParseTokenAsString(GetRequiredToken(el,0));

        // PP = property-property connection, ignored for now
        // (tokens: "PP", ID1, "Property1", ID2, "Property2")
        if ( type == "PP" ) {
            continue;
        }

        const uint64_t src = ParseTokenAsID(GetRequiredToken(el,1));
        const uint64_t dest = ParseTokenAsID(GetRequiredToken(el,2));

        // OO = object-object connection
        // OP = object-property connection, in which case the destination property follows the object ID
        const std::string& prop = (type == "OP" ? ParseTokenAsString(GetRequiredToken(el,3)) : "");

        if(objects.find(src) == objects.end()) {
            DOMWarning("source object for connection does not exist",&el);
            continue;
        }

        // dest may be 0 (root node) but we added a dummy object before
        if(objects.find(dest) == objects.end()) {
            DOMWarning("destination object for connection does not exist",&el);
            continue;
        }

        // add new connection
        const Connection* const c = new_Connection(insertionOrder++,src,dest,prop,*this);
        src_connections.insert(ConnectionMap::value_type(src,c));
        dest_connections.insert(ConnectionMap::value_type(dest,c));
    }
}

// ------------------------------------------------------------------------------------------------
const std::vector<const AnimationStack*>& Document::AnimationStacks() const {
    if (!animationStacksResolved.empty() || animationStacks.empty()) {
        return animationStacksResolved;
    }

    animationStacksResolved.reserve(animationStacks.size());
    for(uint64_t id : animationStacks) {
        LazyObject* const lazy = GetObject(id);
        const AnimationStack *stack = lazy->Get<AnimationStack>();
        if(!lazy || nullptr == stack ) {
            DOMWarning("failed to read AnimationStack object");
            continue;
        }
        animationStacksResolved.push_back(stack);
    }

    return animationStacksResolved;
}

// ------------------------------------------------------------------------------------------------
LazyObject* Document::GetObject(uint64_t id) const {
    ObjectMap::const_iterator it = objects.find(id);
    return it == objects.end() ? nullptr : (*it).second;
}

constexpr size_t MAX_CLASSNAMES  = 6;

// ------------------------------------------------------------------------------------------------
std::vector<const Connection*> Document::GetConnectionsSequenced(uint64_t id, const ConnectionMap& conns) const {
    std::vector<const Connection*> temp;

    const std::pair<ConnectionMap::const_iterator,ConnectionMap::const_iterator> range =
        conns.equal_range(id);

    temp.reserve(std::distance(range.first,range.second));
    for (ConnectionMap::const_iterator it = range.first; it != range.second; ++it) {
        temp.push_back((*it).second);
    }

    std::sort(temp.begin(), temp.end(), std::mem_fn(&Connection::Compare));

    return temp; // NRVO should handle this
}

// ------------------------------------------------------------------------------------------------
std::vector<const Connection*> Document::GetConnectionsSequenced(uint64_t id, bool is_src,
        const ConnectionMap& conns,
        const char* const* classnames,
        size_t count) const {
    ai_assert(classnames);
    ai_assert( count != 0 );
    ai_assert( count <= MAX_CLASSNAMES);

    size_t lengths[MAX_CLASSNAMES] = {};

    const size_t c = count;
    for (size_t i = 0; i < c; ++i) {
        lengths[ i ] = strlen(classnames[i]);
    }

    std::vector<const Connection*> temp;
    const std::pair<ConnectionMap::const_iterator,ConnectionMap::const_iterator> range =
        conns.equal_range(id);

    temp.reserve(std::distance(range.first,range.second));
    for (ConnectionMap::const_iterator it = range.first; it != range.second; ++it) {
        const Token& key = (is_src
            ? (*it).second->LazyDestinationObject()
            : (*it).second->LazySourceObject()
        ).GetElement().KeyToken();

        const char* obtype = key.begin();

        for (size_t i = 0; i < c; ++i) {
            ai_assert(classnames[i]);
            if(static_cast<size_t>(std::distance(key.begin(),key.end())) == lengths[i] && !strncmp(classnames[i],obtype,lengths[i])) {
                obtype = nullptr;
                break;
            }
        }

        if(obtype) {
            continue;
        }

        temp.push_back((*it).second);
    }

    std::sort(temp.begin(), temp.end(), std::mem_fn(&Connection::Compare));
    return temp; // NRVO should handle this
}

// ------------------------------------------------------------------------------------------------
std::vector<const Connection*> Document::GetConnectionsBySourceSequenced(uint64_t source) const {
    return GetConnectionsSequenced(source, ConnectionsBySource());
}

// ------------------------------------------------------------------------------------------------
std::vector<const Connection*> Document::GetConnectionsBySourceSequenced(uint64_t src, const char* classname) const {
    const char* arr[] = {classname};
    return GetConnectionsBySourceSequenced(src, arr,1);
}

// ------------------------------------------------------------------------------------------------
std::vector<const Connection*> Document::GetConnectionsBySourceSequenced(uint64_t source,
        const char* const* classnames, size_t count) const {
    return GetConnectionsSequenced(source, true, ConnectionsBySource(),classnames, count);
}

// ------------------------------------------------------------------------------------------------
std::vector<const Connection*> Document::GetConnectionsByDestinationSequenced(uint64_t dest,
        const char* classname) const {
    const char* arr[] = {classname};
    return GetConnectionsByDestinationSequenced(dest, arr,1);
}

// ------------------------------------------------------------------------------------------------
std::vector<const Connection*> Document::GetConnectionsByDestinationSequenced(uint64_t dest) const {
    return GetConnectionsSequenced(dest, ConnectionsByDestination());
}

// ------------------------------------------------------------------------------------------------
std::vector<const Connection*> Document::GetConnectionsByDestinationSequenced(uint64_t dest,
        const char* const* classnames, size_t count) const {
    return GetConnectionsSequenced(dest, false, ConnectionsByDestination(),classnames, count);
}

// ------------------------------------------------------------------------------------------------
Connection::Connection(uint64_t insertionOrder,  uint64_t src, uint64_t dest, const std::string& prop,
            const Document& doc) :
            insertionOrder(insertionOrder), prop(prop), src(src), dest(dest), doc(doc) {
    ai_assert(doc.Objects().find(src) != doc.Objects().end());
    // dest may be 0 (root node)
    ai_assert(!dest || doc.Objects().find(dest) != doc.Objects().end());
}

// ------------------------------------------------------------------------------------------------
LazyObject& Connection::LazySourceObject() const {
    LazyObject* const lazy = doc.GetObject(src);
    ai_assert(lazy);
    return *lazy;
}

// ------------------------------------------------------------------------------------------------
LazyObject& Connection::LazyDestinationObject() const {
    LazyObject* const lazy = doc.GetObject(dest);
    ai_assert(lazy);
    return *lazy;
}

// ------------------------------------------------------------------------------------------------
const Object* Connection::SourceObject() const {
    LazyObject* const lazy = doc.GetObject(src);
    ai_assert(lazy);
    if (lazy == nullptr) {
        return nullptr;
    }

    return lazy->Get();
}

// ------------------------------------------------------------------------------------------------
const Object* Connection::DestinationObject() const {
    LazyObject* const lazy = doc.GetObject(dest);
    ai_assert(lazy);
    if (lazy == nullptr) {
        return nullptr;
    }

    return lazy->Get();
}

} // !FBX
} // !Assimp

#endif // ASSIMP_BUILD_NO_FBX_IMPORTER

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Created: 2026-05-04 07:03