assimp/code/FBXDocument.h

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

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  following disclaimer.

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*/

/** @file  FBXDocument.h
 *  @brief FBX DOM
 */
#ifndef INCLUDED_AI_FBX_DOCUMENT_H
#define INCLUDED_AI_FBX_DOCUMENT_H

#include <vector>
#include <map>
#include <string>

namespace Assimp {
namespace FBX {

	class Parser;
	class Object;
	struct ImportSettings;

	class PropertyTable;
	class Document;
	class Material;
	class Geometry;


/** Represents a delay-parsed FBX objects. Many objects in the scene
 *  are not needed by assimp, so it makes no sense to parse them
 *  upfront. */
class LazyObject
{
public:

	LazyObject(uint64_t id, const Element& element, const Document& doc);
	~LazyObject();

public:

	const Object* Get();

	template <typename T> 
	T* Get() {
		const Object* const ob = Get();
		return ob ? dynamic_cast<T*>(ob) : NULL;
	}

	uint64_t ID() const {
		return id;
	}

private:

	const Document& doc;
	const Element& element;
	boost::scoped_ptr<const Object> object;

	const uint64_t id;
};



/** Base class for in-memory (DOM) representations of FBX objects */
class Object
{
public:

	Object(uint64_t id, const Element& element, const std::string& name);
	virtual ~Object();

public:

	const Element& SourceElement() const {
		return element;
	}

	const std::string& Name() const {
		return name;
	}

	uint64_t ID() const {
		return id;
	}

protected:
	const Element& element;
	const std::string name;
	const uint64_t id;
};


/** DOM base class for FBX models */
class Model : public Object
{
public:

	Model(uint64_t id, const Element& element, const Document& doc, const std::string& name);
	~Model();

public:

	const std::string& Shading() const {
		return shading;
	}

	const std::string& Culling() const {
		return culling;
	}

	const PropertyTable& Props() const {
		ai_assert(props.get());
		return *props.get();
	}

	/** Get material links */
	const std::vector<const Material*>& GetMaterials() const {
		return materials;
	}


	/** Get geometry links */
	const std::vector<const Geometry*>& GetGeometry() const {
		return geometry;
	}

private:

	void ResolveLinks(const Element& element, const Document& doc);

private:

	std::vector<const Material*> materials;
	std::vector<const Geometry*> geometry;

	std::string shading;
	std::string culling;
	boost::shared_ptr<const PropertyTable> props;
};



/** DOM class for generic FBX textures */
class Texture : public Object
{
public:

	Texture(uint64_t id, const Element& element, const Document& doc, const std::string& name);
	~Texture();

public:

	const std::string& Type() const {
		return type;
	}

	const std::string& FileName() const {
		return fileName;
	}

	const std::string& RelativeFilename() const {
		return relativeFileName;
	}

	const std::string& AlphaSource() const {
		return alphaSource;
	}

	const aiVector2D& UVTranslation() const {
		return uvTrans;
	}

	const aiVector2D& UVScaling() const {
		return uvScaling;
	}

	const PropertyTable& Props() const {
		ai_assert(props.get());
		return *props.get();
	}

	// return a 4-tuple 
	const unsigned int* Crop() const {
		return crop;
	}

private:

	aiVector2D uvTrans;
	aiVector2D uvScaling;

	std::string type;
	std::string relativeFileName;
	std::string fileName;
	std::string alphaSource;
	boost::shared_ptr<const PropertyTable> props;

	unsigned int crop[4];
};


typedef std::fbx_unordered_map<std::string, const Texture*> TextureMap;


/** DOM class for generic FBX materials */
class Material : public Object
{
public:

	Material(uint64_t id, const Element& element, const Document& doc, const std::string& name);
	~Material();

public:

	const std::string& GetShadingModel() const {
		return shading;
	}

	bool IsMultilayer() const {
		return multilayer;
	}

	const PropertyTable& Props() const {
		ai_assert(props.get());
		return *props.get();
	}

	const TextureMap& Textures() const {
		return textures;
	}

private:

	std::string shading;
	bool multilayer;
	boost::shared_ptr<const PropertyTable> props;

	TextureMap textures;
};


/** DOM base class for all kinds of FBX geometry */
class Geometry : public Object
{
public:

	Geometry(uint64_t id, const Element& element, const std::string& name);
	~Geometry();
};


/** DOM class for FBX geometry of type "Mesh"*/
class MeshGeometry : public Geometry
{

public:

	MeshGeometry(uint64_t id, const Element& element, const std::string& name, const Document& doc);
	~MeshGeometry();

public:

	/** Get a list of all vertex points, non-unique*/
	const std::vector<aiVector3D>& GetVertices() const {
		return vertices;
	}

	/** Get a list of all vertex normals or an empty array if
	 *  no normals are specified. */
	const std::vector<aiVector3D>& GetNormals() const {
		return normals;
	}

	/** Get a list of all vertex tangents or an empty array
	 *  if no tangents are specified */
	const std::vector<aiVector3D>& GetTangents() const {
		return tangents;
	}

	/** Get a list of all vertex binormals or an empty array
	 *  if no binormals are specified */
	const std::vector<aiVector3D>& GetBinormals() const {
		return binormals;
	}
	
	/** Return list of faces - each entry denotes a face and specifies
	 *  how many vertices it has. Vertices are taken from the 
	 *  vertex data arrays in sequential order. */
	const std::vector<unsigned int>& GetFaceIndexCounts() const {
		return faces;
	}

	/** Get a UV coordinate slot, returns an empty array if
	 *  the requested slot does not exist. */
	const std::vector<aiVector2D>& GetTextureCoords(unsigned int index) const {
		static const std::vector<aiVector2D> empty;
		return index >= AI_MAX_NUMBER_OF_TEXTURECOORDS ? empty : uvs[index];
	}


	/** Get a UV coordinate slot, returns an empty array if
	 *  the requested slot does not exist. */
	std::string GetTextureCoordChannelName(unsigned int index) const {
		return index >= AI_MAX_NUMBER_OF_TEXTURECOORDS ? "" : uvNames[index];
	}

	/** Get a vertex color coordinate slot, returns an empty array if
	 *  the requested slot does not exist. */
	const std::vector<aiColor4D>& GetVertexColors(unsigned int index) const {
		static const std::vector<aiColor4D> empty;
		return index >= AI_MAX_NUMBER_OF_COLOR_SETS ? empty : colors[index];
	}
	
	
	/** Get per-face-vertex material assignments */
	const std::vector<unsigned int>& GetMaterialIndices() const {
		return materials;
	}

public:

private:

	void ReadLayer(const Scope& layer);
	void ReadLayerElement(const Scope& layerElement);
	void ReadVertexData(const std::string& type, int index, const Scope& source);

	void ReadVertexDataUV(std::vector<aiVector2D>& uv_out, const Scope& source, 
		const std::string& MappingInformationType,
		const std::string& ReferenceInformationType);

	void ReadVertexDataNormals(std::vector<aiVector3D>& normals_out, const Scope& source, 
		const std::string& MappingInformationType,
		const std::string& ReferenceInformationType);

	void ReadVertexDataColors(std::vector<aiColor4D>& colors_out, const Scope& source, 
		const std::string& MappingInformationType,
		const std::string& ReferenceInformationType);

	void ReadVertexDataTangents(std::vector<aiVector3D>& tangents_out, const Scope& source, 
		const std::string& MappingInformationType,
		const std::string& ReferenceInformationType);

	void ReadVertexDataBinormals(std::vector<aiVector3D>& binormals_out, const Scope& source, 
		const std::string& MappingInformationType,
		const std::string& ReferenceInformationType);

	void ReadVertexDataMaterials(std::vector<unsigned int>& materials_out, const Scope& source, 
		const std::string& MappingInformationType,
		const std::string& ReferenceInformationType);

private:

	// cached data arrays
	std::vector<unsigned int> materials;
	std::vector<aiVector3D> vertices;
	std::vector<unsigned int> faces;
	std::vector<aiVector3D> tangents;
	std::vector<aiVector3D> binormals;
	std::vector<aiVector3D> normals;

	std::string uvNames[AI_MAX_NUMBER_OF_TEXTURECOORDS];
	std::vector<aiVector2D> uvs[AI_MAX_NUMBER_OF_TEXTURECOORDS];
	std::vector<aiColor4D> colors[AI_MAX_NUMBER_OF_COLOR_SETS];

	std::vector<unsigned int> mapping_counts;
	std::vector<unsigned int> mapping_offsets;
	std::vector<unsigned int> mappings;
};


/** Represents a link between two FBX objects. */
class Connection
{
public:

	Connection(uint64_t insertionOrder,  uint64_t src, uint64_t dest, const std::string& prop, const Document& doc);
	~Connection();

	// note: a connection ensures that the source and dest objects exist, but
	// not that they have DOM representations, so the return value of one of
	// these functions can still be NULL.
	const Object* SourceObject() const;
	const Object* DestinationObject() const;

	// return the name of the property the connection is attached to.
	// this is an empty string for object to object (OO) connections.
	const std::string& PropertyName() const {
		return prop;
	}

	uint64_t InsertionOrder() const {
		return insertionOrder;
	}

	int CompareTo(const Connection* c) const {
		// note: can't subtract because this would overflow uint64_t
		if(InsertionOrder() > c->InsertionOrder()) {
			return 1;
		}
		else if(InsertionOrder() < c->InsertionOrder()) {
			return -1;
		}
		return 0;
	}

	bool Compare(const Connection* c) const {
		return InsertionOrder() < c->InsertionOrder();
	}

public:

	uint64_t insertionOrder;
	const std::string prop;

	uint64_t src, dest;
	const Document& doc;
};


	// XXX again, unique_ptr would be useful. shared_ptr is too
	// bloated since the objects have a well-defined single owner
	// during their entire lifetime (Document). FBX files have
	// up to many thousands of objects (most of which we never use),
	// so the memory overhead for them should be kept at a minimum.
	typedef std::map<uint64_t, LazyObject*> ObjectMap; 
	typedef std::fbx_unordered_map<std::string, boost::shared_ptr<const PropertyTable> > PropertyTemplateMap;


	typedef std::multimap<uint64_t, const Connection*> ConnectionMap;


/** DOM root for a FBX file */
class Document 
{
public:

	Document(const Parser& parser, const ImportSettings& settings);
	~Document();

public:

	LazyObject* GetObject(uint64_t id) const;

	const PropertyTemplateMap& Templates() const {
		return templates;
	}

	const ObjectMap& Objects() const {
		return objects;
	}

	const ImportSettings& Settings() const {
		return settings;
	}

	const ConnectionMap& ConnectionsBySource() const {
		return src_connections;
	}

	const ConnectionMap& ConnectionsByDestination() const {
		return dest_connections;
	}

	std::vector<const Connection*> GetConnectionsBySourceSequenced(uint64_t source) const;
	std::vector<const Connection*> GetConnectionsByDestinationSequenced(uint64_t dest) const;

private:

	void ReadObjects();
	void ReadPropertyTemplates();
	void ReadConnections();

private:

	const ImportSettings& settings;

	ObjectMap objects;
	const Parser& parser;

	PropertyTemplateMap templates;
	ConnectionMap src_connections;
	ConnectionMap dest_connections;
};

}
}

#endif