#ifndef OBJ_H
#define OBJ_H

#include "ray.h"

#define SPHERE(x, y, z, r) \
	{ \
		.intersect = intersect_sphere, \
		.params = { \
			.sphere = { .centre = { x, y, z }, .radius = r }, \
		}, \
	}

typedef struct {
	vec3_t point, normal;
	double t;
	bool front;
} hit_t;

typedef struct {
	vec3_t centre;
	double radius;
} sphere_params_t;

typedef union {
	sphere_params_t sphere;
} obj_params_t;

typedef bool intersect_fn_t(
    obj_params_t params, ray_t ray, hit_t *hit_out, double t_min,
    double t_max);

typedef struct {
	intersect_fn_t *intersect;
	obj_params_t params;
} obj_t;

bool intersect_sphere(
    obj_params_t params, ray_t ray, hit_t *hit_out, double t_min,
    double t_max);

#endif