Moved phong to seperate function

1 files changed, 37 insertions, 35 deletions

diff --git a/ray.c b/ray.c
index d5b6a89..3eef341 100644
--- a/ray.c
+++ b/ray.c
@@ -148,88 +148,90 @@ object_t *ray_cast(space_t *s, ray_t *r, COORD_T *dist_ret, bool chk, COORD_T ch
 	return smallest;
 }
 
-color_t *ray_trace(space_t *s, unsigned int x, unsigned int y)
+static void ray_calc_light(space_t *s, color_t *dest, object_t *o, vector_t *eye, vector_t *point)
 {
-	// Setup primary ray
 	ray_t r;
-	r.start = &s->view.position;
-	r.direction = vector_copy(NULL, NULL);
-	viewpoint_ray(&s->view, r.direction, x, y);
-
-	// Cast it
-	COORD_T dist;
-	object_t *o = ray_cast(s, &r, &dist, false, 0);
-	if (!o) {
-		return NULL;
-	}
-
-	r.start = vector_scale(NULL, r.direction, dist);
-	vector_add(r.start, r.start, &s->view.position);
+	r.start = point;
 
 	// Calculate normal vector
-	vector_t n;
-	obj_norm_at(o, &n, r.start);
+	vector_t N;
+	obj_norm_at(o, &N, point);
 	
 	// And vector towards viewer
-	//printf("point: "); vector_print(r.start);
 	vector_t V;
-	vector_sub(&V, &s->view.position, r.start);
+	vector_sub(&V, eye, point);
+
 	// Normalice it
 	vector_scale_inv(&V, &V, vector_len(&V));
-	//printf("V: "); vector_print(&V);
-
-	// Hit color
-	color_t *c = color_set(NULL, s->ambient.r, s->ambient.g, s->ambient.b);
 
 	// Cast light rays
 	light_t *light = s->lights;
 	while (light) {
 		vector_t l;
+		
 		// Calculate distance to light
-		vector_sub(&l, light->pos, r.start);
+		vector_sub(&l, light->pos, point);
 		COORD_T d = vector_len(&l);
 
+		// Normalice
 		vector_scale_inv(&l, &l, vector_len(&l));
 
 		// Find obstacles
-		if (print) printf("Starting\n");
 		r.direction = &l;
 		object_t *obs = ray_cast(s, &r, NULL, true, d);
 		if (obs) {
-			if (print)
-				printf("Light ray hit\n");
-
 			light = light->next;
 			continue;
 		}
-			if (print)
-				printf("Light ray went through\n");
 		
 		// Calculate Deffuse part
 		color_t tmp;
-		COORD_T cl = vector_dot(&l, &n);
+		COORD_T cl = vector_dot(&l, &N);
 		if (cl > 0) {
 			color_scale(&tmp, light->defuse, cl * o->m->defuse);
-			color_add(c, &tmp, c);
+			color_add(dest, &tmp, dest);
 		}
 
 		// calculate specular part. TODO implement blinn-phong
 		// Calculate R_m
 		vector_t R;
-		vector_scale(&R, &n, 2 * vector_dot(&l, &n));
+		vector_scale(&R, &N, 2 * vector_dot(&l, &N));
 		vector_sub(&R, &R, &l);
-		//printf("R: ");vector_print(&R);
 		
 		// Add it to the light
 		cl = 1 * vector_dot(&R, &V);
 		if (cl > 0) {
 			cl = pow(cl, o->m->shine);
 			color_scale(&tmp, light->specular, cl * o->m->specular);
-			color_add(c, &tmp, c);
+			color_add(dest, &tmp, dest);
 		}
 
 		light = light->next;
 	}
+}
+
+color_t *ray_trace(space_t *s, unsigned int x, unsigned int y)
+{
+	// Setup primary ray
+	ray_t r;
+	r.start = &s->view.position;
+	r.direction = vector_copy(NULL, NULL);
+	viewpoint_ray(&s->view, r.direction, x, y);
+
+	// Cast it
+	COORD_T dist;
+	object_t *o = ray_cast(s, &r, &dist, false, 0);
+	if (!o) {
+		return NULL;
+	}
+
+	r.start = vector_scale(NULL, r.direction, dist);
+	vector_add(r.start, r.start, &s->view.position);
+
+	// Hit color
+	color_t *c = color_set(NULL, s->ambient.r, s->ambient.g, s->ambient.b);
+
+	ray_calc_light(s, c, o, &s->view.position, r.start);
 
 	color_scale_vector(c, c, &o->m->color);