#pragma once

#include "tuples.h"
#include "matrices.h"

struct ray {
  struct tuple origin;
  struct tuple direction;
};

inline static struct ray ray(struct tuple origin, struct tuple direction)
{
  return (struct ray){origin, direction};
}

inline static struct tuple ray_position(struct ray ray, float t)
{
  return tuple_add(ray.origin, tuple_mul(ray.direction, t));
}

inline static struct ray ray_transform(struct ray r, struct mat4x4 m)
{
  return ray(mat4x4_mul_t(m, r.origin),
             mat4x4_mul_t(m, r.direction));
}