cub5d/src/render/dda.c at master · d3bvstack/cub5d · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   dda.c                                              :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: dbarba-v <dbarba-v@student.42madrid.com    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2026/01/16 11:19:40 by dbarba-v          #+#    #+#             */
/*   Updated: 2026/01/16 16:16:24 by dbarba-v         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "game.h"
#include <math.h>

int	get_step(float ray_dir)
{
	if (ray_dir < 0)
		return (-1);
	else
		return (1);
}

float	get_side_dist(float ray_dir, float player_xy, int map_xy,
		float delta_dist)
{
	if (ray_dir < 0)
		return ((player_xy - map_xy) * delta_dist);
	else
		return ((map_xy + 1.0 - player_xy) * delta_dist);
}

void	setup_dda(t_render *render_info, t_game *game)
{
	t_player	*player;
	float		ray_dir_x;
	float		ray_dir_y;

	player = &(game->scene->map.player);
	ray_dir_x = render_info->ray_dir_x;
	ray_dir_y = render_info->ray_dir_y;
	render_info->map_x = (int)player->x;
	render_info->map_y = (int)player->y;
	render_info->delta_dist_x = fabs(1 / render_info->ray_dir_x);
	render_info->delta_dist_y = fabs(1 / render_info->ray_dir_y);
	render_info->step_x = get_step(render_info->ray_dir_x);
	render_info->step_y = get_step(render_info->ray_dir_y);
	render_info->side_dist_x = get_side_dist(ray_dir_x, player->x,
			render_info->map_x, render_info->delta_dist_x);
	render_info->side_dist_y = get_side_dist(ray_dir_y, player->y,
			render_info->map_y, render_info->delta_dist_y);
}

void	dda(t_render *render_info, t_game *game)
{
	int	map_x;
	int	map_y;

	map_x = render_info->map_x;
	map_y = render_info->map_y;
	while (1)
	{
		if (render_info->side_dist_x < render_info->side_dist_y)
		{
			render_info->side_dist_x += render_info->delta_dist_x;
			map_x += render_info->step_x;
			render_info->side = 0;
		}
		else
		{
			render_info->side_dist_y += render_info->delta_dist_y;
			map_y += render_info->step_y;
			render_info->side = 1;
		}
		if (game->scene->map.matrix[map_y][map_x] == '1')
			return ;
	}
}