/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_floor_cast_inits.c                              :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: rbousset <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2020/02/14 17:22:57 by rbousset          #+#    #+#             */
/*   Updated: 2020/02/14 17:23:42 by rbousset         ###   ########lyon.fr   */
/*                                                                            */
/* ************************************************************************** */

#include <cub3d.h>
#include <stdint.h>

void
	ft_floor_cast_inits(uint16_t y, t_ray *rl, t_cub *cl)
{
	rl->x_f_ray_dir = cl->plist.dir_x - cl->plist.plane_x;
	rl->y_f_ray_dir = cl->plist.dir_y - cl->plist.plane_y;
	rl->x_f_ray_dir_bis = cl->plist.dir_x + cl->plist.plane_x;
	rl->y_f_ray_dir_bis = cl->plist.dir_y + cl->plist.plane_y;
	rl->p = y - cl->wlist.y_size / 2;
	cl->plist.pos_z = 0.5 * cl->wlist.y_size;
	rl->row_dist = cl->plist.pos_z / rl->p;
	cl->mlist.x_floor_step = rl->row_dist *
		(rl->x_f_ray_dir_bis - rl->x_f_ray_dir) / cl->wlist.x_size;
	cl->mlist.y_floor_step = rl->row_dist *
		(rl->y_f_ray_dir_bis - rl->y_f_ray_dir) / cl->wlist.x_size;
	rl->x_floor = cl->plist.pos_y + rl->row_dist * rl->x_f_ray_dir;
	rl->y_floor = cl->plist.pos_x + rl->row_dist * rl->y_f_ray_dir;
}