#ifndef OBJ_H
#define OBJ_H

/* external variables */
char obj_last_fname[31];

typedef struct
{
    float x, y, z;
} ObjVertex;
typedef ObjVertex ObjNormal;

typedef struct
{
    float u, v;
} ObjTexCoord;

typedef struct
{
    int Vertex[4];
    int Normal[4];
    int TexCoord[4];
} ObjFace;

typedef struct
{
	float Ns;
	float Ni;
	float d;
	float Tr;
	ObjVertex Tf;
	int illum;
	ObjVertex Ka;
	ObjVertex Kd;
	ObjVertex Ks;
	ObjVertex Ke;
	char *map_Ka;
	char *map_Kd;
} ObjMtl;

typedef struct
{
    char *mtllib;
    char *objectName;
    char *groupName;
    char *usemtl;
   
    ObjMtl *mtl;
    int nVertex, nNormal, nTexCoord, nFace;
    ObjVertex *VertexArray;
    ObjNormal *NormalArray;
    ObjTexCoord *TexCoordArray;
    ObjFace *FaceArray;
} ObjModel;

/* function prototypes */
ObjModel *ObjLoadModel(char *, size_t);

/* read a file into argument 2, and return amount of bytes read */
size_t ObjLoadFile(char *, char **);

void ObjList(ObjModel *);

/* once we load an .obj file, we can extract path up to last '/' to load a
 * mtl or texture that resides in the same folder */
char *ObjGetPath(char *);

void ObjFree(ObjModel *);

#endif