Add vector magnitude calculation

src/raytracer/main.c

@@ -30,7 +30,7 @@ solutions_t ray_intersects_sphere(vec3f_t origin, vec3f_t direction,
 colour_t trace_ray(vec3f_t origin, vec3f_t direction, f32 t_min, f32 t_max,
                    const scene_t *scene, colour_t default_colour);
 
-int main(int argc, char *argv[]) {
+i32 main(i32 argc, char *argv[]) {
   colour_t bg = (colour_t){.r = 27, .g = 38, .b = 79, .a = 255};
   vec3f_t camera = {.x = 0.0f, .y = 0.0f, .z = 0.0f};
   vec3f_t viewport = {.x = 1.0f, .y = 1.0f, .z = 1.0f};