#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <GL/glut.h>
#include <sys/time.h>

typedef struct {
	double x,y,z;
} XYZ;

#define CROSSPROD(p1,p2,p3) \
   p3.x = p1.y*p2.z - p1.z*p2.y; \
   p3.y = p1.z*p2.x - p1.x*p2.z; \
   p3.z = p1.x*p2.y - p1.y*p2.x

typedef struct {
   XYZ vp;                /* View position           */
   XYZ vd;                /* View direction vector   */
   XYZ vu;                /* View up direction       */
   XYZ pr;                /* Point to rotate about   */
   double focallength;    /* Focal Length along vd   */
   double aperture;       /* Camera aperture         */
   double eyesep;         /* Eye separation          */
	double near,far;       /* Cutting plane distances */
	int stereo;				  /* Are we in stereo mode   */
   int screenwidth;       /* Screen dimensions       */
   int screenheight;      /*                         */
} CAMERA;
typedef struct {
	int debug;             /* Debug mode              */
	int record;            /* Movie recording mode    */
	int windowdump;        /* Image recording modes   */
	int fullscreen;        /* Game mode or not        */
	double targetfps;      /* Target frame rate       */
} OPTIONS;
typedef struct {
	int button;
	int shift;
	int mouseh;
	int mousev;
} INTERFACESTATE;

#define TWOPI 6.283185307179586476925287
#define DTOR 0.0174532925
#define RTOD 57.2957795
#define ESC 27

#define TRUE  1
#define FALSE 0

#define NOSTEREO     0
#define ACTIVESTEREO 1
#define DUALSTEREO   2

void CreateMenus(void);
void CreateEnvironment(void);
void CreateGeometry(void);

void HandleDisplay(void);
void HandleKeyboard(unsigned char,int,int);
void HandleSpecialKeyboard(int,int,int);
void HandleMouse(int,int,int,int);
void HandleReshape(int,int);
void HandleMouseMotion(int,int);
void HandlePassiveMotion(int,int);
void HandleVisibility(int);
void HandleIdle(void);

void GiveUsage(char *);
void RotateCamera(double,double,double);
void TranslateCamera(double,double,double);
void CameraHome(int);

void HandleMainMenu(int);
void HandleCameraMenu(int);

double Modulus(XYZ);
void Normalise(XYZ *);
double GetRunTime(void);
int Dump2TGA(int,int,int);
void WriteTGA(FILE *,unsigned char *,int,int);