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;


/** 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(const Element& element);
	~LazyObject();

public:

	const Object* Get();

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

private:

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



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

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

public:

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


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

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


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

public:

	MeshGeometry(const Element& element, const std::string& name);
	~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;
	}
	
	/** 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<aiVector3D>& GetTextureCoords(unsigned int index) const {
		static const std::vector<aiVector3D> empty;
		return index >= AI_MAX_NUMBER_OF_TEXTURECOORDS ? empty : uvs[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:

	// cached data arrays
	std::vector<unsigned int> materials;
	std::vector<aiVector3D> vertices;
	std::vector<unsigned int> faces;
	std::vector<aiVector3D> tangents;
	std::vector<aiVector3D> normals;
	std::vector<aiVector3D> uvs[AI_MAX_NUMBER_OF_TEXTURECOORDS];
	std::vector<aiColor4D> colors[AI_MAX_NUMBER_OF_COLOR_SETS];
};

	// 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; 


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

	Document(const Parser& parser);
	~Document();

public:

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

private:

	ObjectMap objects;
	const Parser& parser;
};

}
}

#endif