/******************************************************************/
/*         Raytracer declarations, Project 5, CS354               */
/******************************************************************/


/* constants */
#define TRUE 1
#define FALSE 0

/* data structures */

typedef struct point {
  GLfloat x;
  GLfloat y;
  GLfloat z;
  GLfloat w;
} point;

/* a vector is just a point */
typedef point vector;

/* a line segment */
typedef struct segment {
  point* start;
  point* end;
} segment;

/* a ray is just a segment with an endpoint at infinity */
typedef segment ray;

typedef struct color {
  GLfloat r;
  GLfloat g;
  GLfloat b; 
  /* these should be between 0 and 1 */
} color;

typedef struct material {
  /* color */
  color c;
  /* ambient reflectivity */
  GLfloat amb;
} material;

typedef struct sphere {
  point* c;  /* center */
  GLfloat r;  /* radius */
  material* m;
} sphere;

/* functions in tracer.c */
void trace (ray*, point*, vector*, material**);

/* functions in shader.c */
material* makeMaterial(GLfloat, GLfloat, GLfloat, GLfloat);
void shade(point*,vector*,material*, color*);

/* global variables */
extern int width;
extern int height;

/* the scene: so far, just one sphere */
sphere* s1;