// -----------------------------------------------------
// File: md3.h
// Description: header for methods, which loads and 
// renders a *.md3 file
//
// Author: Wolfgang Engel (wolf@direct3d.net)
// Internet: www.direct3d.net
// Last modified: 13. September 2000
// -----------------------------------------------------
#define STRICT
#define D3D_OVERLOADS
#include <windows.h>
#include <stdio.h>		// file i/o
#include <tchar.h>

#include <D3DX8.h>
#include <DXUtil.h>

// typedefs
typedef int TRIANGLEVERT[3];
typedef char TEXNAMES[68];
typedef D3DXVECTOR3 *VMESHFRAME;
typedef struct
{
	float u;
	float v;
} TEXCOORDS;  

//------------------------------------------------------------
// the length of MD3HEADER, MD3BONEFRAME, MD3TAG, MD3MESHFILE 
// and MD3VERTEX is fixed in the md3 file
//------------------------------------------------------------
typedef struct
{
	char id[4];			// id of file, always "IDP3"
	int iVersion;		// version number
	char cFileName[68];	
	int iBoneFrameNum;	// Number of animation key frames in the whole model=every mesh
	int iTagNum;		// Number of tags
	int iMeshNum;		// Number of meshes
	int iMaxTextureNum;	// maximum number of unique textures used in a md3 model
	int iHeaderSize;	// size of header
	int iTagStart;		// starting position of tag frame structures
	int iMeshStart;		// starting position of mesh structures
	int iFileSize;
} MD3HEADER;

typedef struct
{
    FLOAT fMins[3];
	FLOAT fMaxs[3];		// extrema of the bounding box 
    FLOAT pos[3];		// position of the bounding box 
    float scale;		// scaling the bounding box
    char creator[16];
} MD3BONEFRAME;

typedef struct
{
	char cTagName[12];
	char unknown [52];
    FLOAT pos[3];		// position of tag relative to the model that contains the tag
    FLOAT fMatrix[3][3];// the direction the tag is facing
} MD3TAG;

typedef struct
{
	char cId[4];
	char cName[68];		
	int iMeshFrameNum;  // number of frames in mesh
	int iTextureNum;	// number of textures=skins in this mesh
	int iVertexNum;		// number of vertices in this mesh
	int iTriangleNum;	// number of triangles
	int iTriangleStart;	// starting position of triangle data, relative to the start of MD3Mesh
	int iHeaderSize;	// Headersize = starting position of texture data
	int iTecVecStart;	// starting position of the texture vector data
	int iVertexStart;	// starting position of the vertex data
	int iMeshSize;
} MD3MESHFILE;

typedef struct
{
    SHORT vec[3];
    UCHAR unknown;
} MD3VERTEX;

typedef struct
{
	char cName[68];				// 65 chars, 32-bit aligned == 68 chars in file

	int iNumVertices;			// Mesh vertices

	int iMeshFrameNum;			// animation frames in mesh
	VMESHFRAME *vMeshFrames;    // stores vertices per animation frame in
								// vertices[FrameNum][VertexNum]

	int iNumTriangles;			// Mesh triangles
	TRIANGLEVERT *pTriangles;	

	int iNumTextures;			// Mesh textures
	TEXNAMES *pTexNames;
    LPDIRECT3DTEXTURE8* pTexturesInterfaces;

	TEXCOORDS *pfTextureCoords;	// Mesh tex coordinates
	TEXCOORDS *pfEnvTextureCoords;  // not used here
} MD3MESH;

class CMD3Model
{
 private:
	int				iNumMeshes;
	MD3MESH			*pMd3Meshes;
	MD3BONEFRAME	*md3BoneFrame;
	MD3TAG			**md3Tags;

	FILE *LogFile;	// the log file for md3 geometry data.txt 
					// and md3 textures.txt

	LPDIRECT3DVERTEXBUFFER8 m_pVB;	// Buffer to hold vertices
	
	long ReadLong(FILE* File);		// file i/o helper
	short ReadShort(FILE* File);
	FLOAT ReadFloat(FILE* File);

	void CreateVB(LPDIRECT3DDEVICE8 lpD3Ddevice);	// vertex buffer system
	void DeleteVB();

	void CreateTextures(LPDIRECT3DDEVICE8 lpD3Ddevice);	// texture system
	void DeleteTextures();

 public:
	BOOL CreateModel( char *fname, LPDIRECT3DDEVICE8 lpD3Ddevice);	// class methods
	void DeleteModel();

	void InitDeviceObjects(LPDIRECT3DDEVICE8 lpD3Ddevice);
	void DeleteDeviceObjects();

	void Render(LPDIRECT3DDEVICE8 lpD3Ddevice);

    CMD3Model();  	// constructor/destructor
	~CMD3Model();
};