/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ray.c                                              :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: gbrochar <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2019/02/08 13:32:52 by gbrochar          #+#    #+#             */
/*   Updated: 2019/02/22 17:29:07 by gbrochar         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "rtv1.h"

t_vec					get_r_vec(t_vec i_ray, t_vec normal)
{
	t_vec				r_ray;

	r_ray = vec_sub(i_ray, vec_mul(normal, 2 * dot_product(i_ray, normal)));
	return (r_ray);
}

t_ray					set_ray(t_env *e, int x, int y)
{
	t_ray				r;

	r.o = e->camera.o;
	r.d = vec_add(e->camera.ul, vec_sub(
				vec_mul(e->camera.rv, ((double)x * e->camera.width / WINX)),
				vec_mul(e->camera.uv, ((double)y * e->camera.height / WINY))));
	r.d = vec_sub(r.d, r.o);
	normalize(&r.d);
	return (r);
}