shere loop and diffuse material update

-unfortunately we cannot use classes like in the paper [https://gitlab.hrz.tu-chemnitz.de/bp59gudo--tu-freiberg.de/mm_raytracer/blob/sphere/paper/Ray_Tracing_in_a_Weekend.pdf] described, so the loop is still not as it should be.

OpenGL_Raytracer/OpenGL_Raytracer/Shader/compute.c

@@ -23,41 +23,61 @@ struct hit_record {
 vec3 point_at_parameter(vec3 A, float t)
 	{ return A + t * ray_d; }
 
-bool hit_sphere(float max_x, float max_y, struct sphere s, hit_record& rec, float t_max, float t_min)
+bool hit_sphere(float max_x, float max_y, struct sphere s[], hit_record& rec, float t_max, float t_min)
 {
-	vec3 ray_o = vec3(max_x, max_y, 0.0);
-	vec3 omc = ray_o - s.sphere_c;
-	float a = dot(ray_d, ray_d);
-	float b = dot(ray_d, omc);
-	float c = dot(omc, omc) - s.sphere_r * s.sphere_r;
-	float discriminant = b * b - a*c;
-  
-	// hit one or both sides
-	if (discriminant > 0.0){
-		float temp = (-b - sqrt(discriminant)) / a;
-		if (temp < t_max && temp > t_min) {
-			rec.t = temp;
-			rec.p = point_at_parameter(ray_o, rec.t);
-			rec.normal = (rec.p - s.sphere_c) / s.sphere_r;
-			return true;
-		}
-		temp = (-b + sqrt(discriminant)) / a;
-		if (temp < t_max && temp > t_min) {
-			rec.t = temp;
-			rec.p = point_at_parameter(ray_o, rec.t);
-			rec.normal = (rec.p - s.sphere_c) / s.sphere_r;
-			return true;
+	bool hit;
+	for (int i = 0; spherelist[i] = '\0'; i++)
+	{
+		vec3 ray_o = vec3(max_x, max_y, 0.0);
+		vec3 omc = ray_o - s[i].sphere_c;
+		float a = dot(ray_d, ray_d);
+		float b = dot(ray_d, omc);
+		float c = dot(omc, omc) - s[i].sphere_r * s[i].sphere_r;
+		float discriminant = b * b - a * c;
+
+		// hit one or both sides
+		if (discriminant > 0.0) {
+			float temp = (-b - sqrt(discriminant)) / a;
+			if (temp < t_max && temp > t_min) {
+				rec.t = temp;
+				rec.p = point_at_parameter(ray_o, rec.t);
+				rec.normal = (rec.p - s[i].sphere_c) / s[i].sphere_r;
+				hit = true;
+			}
+			temp = (-b + sqrt(discriminant)) / a;
+			if (temp < t_max && temp > t_min) {
+				rec.t = temp;
+				rec.p = point_at_parameter(ray_o, rec.t);
+				rec.normal = (rec.p - s[i].sphere_c) / s[i].sphere_r;
+				hit = true;
+			}
 		}
+		hit = false;
 	}
-	return false;
+	return hit;
+}
+
+
+
+vec3 random_in_unit_sphere() {
+	vec3 p;
+	do {
+		p = 2.0 * vec3(drand48(), drand48(), drand()) - vec3(1, 1, 1);
+	} while (p.squared_length() >= 1.0);
+	return p;
 }
 
-vec4 color(float max_x, float max_y, sphere s)
+
+
+
+vec4 color(float max_x, float max_y, sphere s[])
 {
 	hit_record rec;
 	
 
-	if (hit_sphere(max_x, max_y, s, rec, MAXBOUNDS, 0.0)) {
+	if (hit_sphere(max_x, max_y, s[], rec, MAXBOUNDS, 0.0)) {
+		//vec3 target = rec.p + rec.normal + random_in_unit_sphere();
+		//todo diffuse output
 		return 0.5 * vec4(rec.normal.x + 1, rec.normal.y + 1, rec.normal.z + 1, 2);
 	}
 	else
@@ -104,10 +124,9 @@ void main() {
   float x = (float(pixel_coords.x * 2 - dims.x) / dims.x);
   float y = (float(pixel_coords.y * 2 - dims.y) / dims.y);
 
-  for (int i = 0; spherelist[] = "\0", i++)
-  {
-	  vec4 pixel = color(x * max_x, y * max_y, spherelist[i]);
-  }
+  
+  vec4 pixel = color(x * max_x, y * max_y, spherelist[]);
+
 
   // output to a specific pixel in the image
   imageStore(img_output, pixel_coords, pixel);