#pragma once

#include "math.h"
#include "matrices.h"
#include "materials.h"
#include "shapes.h"
#include "rays.h"
#include "intersections.h"

inline static struct shape plane()
{
  return (struct shape){
    mat4x4_identity(),
    material(),
    SHAPE_PLANE,
  };
}

inline static struct tuple plane_normal_at(struct tuple local_point)
{
  return vector(0.0f, 1.0f, 0.0f);
}

inline static void plane_intersect(struct shape const * const s, struct ray local_ray, struct intersections * intersections)
{
  if (fabsf(local_ray.direction.y) < epsilon) {
    return;
  }

  float t = -local_ray.origin.y / local_ray.direction.y;

  intersections->i[intersections->count++] = intersection(t, s);

  return;
}