/******************************************************************/
/*         Lighting functions, Project 6, CS345                   */
/******************************************************************/

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glut.h>
#include "raytrace.h"

material* makeMaterial(GLfloat r, GLfloat g, GLfloat b, GLfloat amb) {
  material* m;
  
  /* allocate memory */
  m = (material*) malloc(sizeof(material));
  /* put stuff in it */
  m->c.r = r;
  m->c.g = g;
  m->c.b = b;
  m->amb = amb;
  return(m);
}

/* LIGHTING CALCULATIONS */

/* shade */
/* color of point p with normal vector n and material m returned in c */
void shade(point* p,vector* n,material* m, color* c) {

  /* so far, just finds ambient component of color */
  c->r = m->amb * m->c.r;
  c->g = m->amb * m->c.g;
  c->b = m->amb * m->c.b;
  
  /* clamp color values to 1.0 */
  if (c->r > 1.0) c->r = 1.0;
  if (c->g > 1.0) c->g = 1.0;
  if (c->b > 1.0) c->b = 1.0;

}