assimp/code/SMDLoader.h

/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------

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All rights reserved.

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  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
  copyright notice, this list of conditions and the
  following disclaimer in the documentation and/or other
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* Neither the name of the assimp team, nor the names of its
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*/

/** @file  SMDLoader.h
 *  @brief Defintion of the Valve SMD file format
 */

#ifndef AI_SMDLOADER_H_INCLUDED
#define AI_SMDLOADER_H_INCLUDED

// internal headers
#include "BaseImporter.h"
#include "ParsingUtils.h"

// public Assimp headers
#include "../include/assimp/types.h"
#include "../include/assimp/texture.h"
#include "../include/assimp/anim.h"
#include "../include/assimp/material.h"
struct aiNode;

// STL headers
#include <vector>

namespace Assimp	{


namespace SMD	{

// ---------------------------------------------------------------------------
/** Data structure for a vertex in a SMD file
*/
struct Vertex
{
	Vertex() : iParentNode(UINT_MAX)
	 {}

	//! Vertex position, normal and texture coordinate
	aiVector3D pos,nor,uv;

	//! Vertex parent node
	unsigned int iParentNode;

	//! Links to bones: pair.first is the bone index,
	//! pair.second is the vertex weight.
	//! WARN: The remaining weight (to reach 1.0f) is assigned
	//! to the parent node/bone
	std::vector<std::pair<unsigned int, float> > aiBoneLinks;
};

// ---------------------------------------------------------------------------
/** Data structure for a face in a SMD file
*/
struct Face
{
	Face() : iTexture(0x0)
	 {}

	//! Texture index for the face
	unsigned int iTexture;

	//! The three vertices of the face
	Vertex avVertices[3];
};

// ---------------------------------------------------------------------------
/** Data structure for a bone in a SMD file
*/
struct Bone
{
	//! Default constructor
	Bone() : iParent(UINT_MAX), bIsUsed(false)
	{
	}

	//! Destructor
	~Bone()
	{
	}

	//! Name of the bone
	std::string mName;

	//! Parent of the bone
	uint32_t iParent;

	//! Animation of the bone
	struct Animation
	{
		//! Public default constructor
		Animation() 
		{
			asKeys.reserve(20);
		}

		//! Data structure for a matrix key
		struct MatrixKey
		{
			//! Matrix at this time
			aiMatrix4x4 matrix;

			//! Absolute transformation matrix
			aiMatrix4x4 matrixAbsolute;

			//! Position
			aiVector3D vPos;

			//! Rotation (euler angles)
			aiVector3D vRot;

			//! Current time. may be negative, this
			//! will be fixed later
			double dTime;
		};

		//! Index of the key with the smallest time value
		uint32_t iFirstTimeKey;

		//! Array of matrix keys
		std::vector<MatrixKey> asKeys;

	} sAnim;

	//! Offset matrix of the bone
	aiMatrix4x4 mOffsetMatrix;

	//! true if the bone is referenced by at least one mesh
	bool bIsUsed;
};

} //! namespace SMD

// ---------------------------------------------------------------------------
/** Used to load Half-life 1 and 2 SMD models
*/
class SMDImporter : public BaseImporter
{
public:
	SMDImporter();
	~SMDImporter();


public:

	// -------------------------------------------------------------------
	/** Returns whether the class can handle the format of the given file. 
	 * See BaseImporter::CanRead() for details.
	 */
	bool CanRead( const std::string& pFile, IOSystem* pIOHandler,
		bool checkSig) const;

	// -------------------------------------------------------------------
	/** Called prior to ReadFile().
	 * The function is a request to the importer to update its configuration
	 * basing on the Importer's configuration property list.
	 */
	void SetupProperties(const Importer* pImp);

protected:


	// -------------------------------------------------------------------
	/** Return importer meta information.
	 * See #BaseImporter::GetInfo for the details
	 */
	const aiImporterDesc* GetInfo () const;

	// -------------------------------------------------------------------
	/** Imports the given file into the given scene structure. 
	* See BaseImporter::InternReadFile() for details
	*/
	void InternReadFile( const std::string& pFile, aiScene* pScene, 
		IOSystem* pIOHandler);

protected:

	// -------------------------------------------------------------------
	/** Parse the SMD file and create the output scene
	*/
	void ParseFile();

	// -------------------------------------------------------------------
	/** Parse the triangles section of the SMD file
	 * \param szCurrent Current position in the file. Points to the first
	 * data line of the section.
	 * \param szCurrentOut Receives a pointer to the heading line of
	 * the next section (or to EOF)
	*/
	void ParseTrianglesSection(const char* szCurrent,
		const char** szCurrentOut);

	// -------------------------------------------------------------------
	/** Parse the vertex animation section in VTA files
	 * \param szCurrent Current position in the file. Points to the first
	 * data line of the section.
	 * \param szCurrentOut Receives a pointer to the heading line of
	 * the next section (or to EOF)
	*/
	void ParseVASection(const char* szCurrent,
		const char** szCurrentOut);

	// -------------------------------------------------------------------
	/** Parse the nodes section of the SMD file
	 * \param szCurrent Current position in the file. Points to the first
	 * data line of the section.
	 * \param szCurrentOut Receives a pointer to the heading line of
	 * the next section (or to EOF)
	*/
	void ParseNodesSection(const char* szCurrent,
		const char** szCurrentOut);

	// -------------------------------------------------------------------
	/** Parse the skeleton section of the SMD file
	 * \param szCurrent Current position in the file. Points to the first
	 * data line of the section.
	 * \param szCurrentOut Receives a pointer to the heading line of
	 * the next section (or to EOF)
	*/
	void ParseSkeletonSection(const char* szCurrent,
		const char** szCurrentOut);

	// -------------------------------------------------------------------
	/** Parse a single triangle in the SMD file
	 * \param szCurrent Current position in the file. Points to the first
	 * data line of the section.
	 * \param szCurrentOut Receives the output cursor position
	*/
	void ParseTriangle(const char* szCurrent,
		const char** szCurrentOut);


	// -------------------------------------------------------------------
	/** Parse a single vertex in the SMD file
	 * \param szCurrent Current position in the file. Points to the first
	 * data line of the section.
	 * \param szCurrentOut Receives the output cursor position
	 * \param vertex Vertex to be filled
	*/
	void ParseVertex(const char* szCurrent,
		const char** szCurrentOut, SMD::Vertex& vertex,
		bool bVASection = false);

	// -------------------------------------------------------------------
	/** Get  the index of a texture. If the texture was not yet known
	 *  it will be added to the internal texture list.
	 * \param filename Name of the texture
	 * \return Value texture index
	 */
	unsigned int GetTextureIndex(const std::string& filename);

	// -------------------------------------------------------------------
	/** Computes absolute bone transformations
	 * All output transformations are in worldspace.
	 */
	void ComputeAbsoluteBoneTransformations();


	// -------------------------------------------------------------------
	/** Parse a line in the skeleton section
	 */
	void ParseSkeletonElement(const char* szCurrent,
		const char** szCurrentOut,int iTime);

	// -------------------------------------------------------------------
	/** Parse a line in the nodes section
	 */
	void ParseNodeInfo(const char* szCurrent,
		const char** szCurrentOut);


	// -------------------------------------------------------------------
	/** Parse a floating-point value
	 */
	bool ParseFloat(const char* szCurrent,
		const char** szCurrentOut, float& out);

	// -------------------------------------------------------------------
	/** Parse an unsigned integer. There may be no sign!
	 */
	bool ParseUnsignedInt(const char* szCurrent,
		const char** szCurrentOut, unsigned int& out);

	// -------------------------------------------------------------------
	/** Parse a signed integer. Signs (+,-) are handled.
	 */
	bool ParseSignedInt(const char* szCurrent,
		const char** szCurrentOut, int& out);

	// -------------------------------------------------------------------
	/** Fix invalid time values in the file
	 */
	void FixTimeValues();

	// -------------------------------------------------------------------
	/** Add all children of a bone as subnodes to a node
	 * \param pcNode Parent node
	 * \param iParent Parent bone index
	 */
	void AddBoneChildren(aiNode* pcNode, uint32_t iParent);

	// -------------------------------------------------------------------
	/** Build output meshes/materials/nodes/animations
	 */
	void CreateOutputMeshes();
	void CreateOutputNodes();
	void CreateOutputAnimations();
	void CreateOutputMaterials();


	// -------------------------------------------------------------------
	/** Print a log message together with the current line number
	 */
	void LogErrorNoThrow(const char* msg);
	void LogWarning(const char* msg);


	// -------------------------------------------------------------------
	inline bool SkipLine( const char* in, const char** out)
	{
		Assimp::SkipLine(in,out);
		++iLineNumber;
		return true;
	}
	// -------------------------------------------------------------------
	inline bool SkipSpacesAndLineEnd( const char* in, const char** out)
	{
		++iLineNumber;
		return Assimp::SkipSpacesAndLineEnd(in,out);
	}

private:

	/** Configuration option: frame to be loaded */
	unsigned int configFrameID;

	/** Buffer to hold the loaded file */
	const char* mBuffer;

	/** Output scene to be filled
	*/
	aiScene* pScene;

	/** Size of the input file in bytes
	 */
	unsigned int iFileSize;

	/** Array of textures found in the file
	 */
	std::vector<std::string> aszTextures;

	/** Array of triangles found in the file
	 */
	std::vector<SMD::Face> asTriangles;

	/** Array of bones found in the file
	 */
	std::vector<SMD::Bone> asBones;

	/** Smallest frame index found in the skeleton
	 */
	int iSmallestFrame;

	/** Length of the whole animation, in frames
	 */
	double dLengthOfAnim;

	/** Do we have texture coordinates?
	 */
	bool bHasUVs;

	/** Current line numer
	 */
	unsigned int iLineNumber;

};

} // end of namespace Assimp

#endif // AI_SMDIMPORTER_H_INC