cub3d/src/raycast/walls.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   walls.c                                            :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: kcolin <kcolin@42.fr>                      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/07/31 13:17:39 by kcolin            #+#    #+#             */
/*   Updated: 2025/08/05 12:49:26 by kcolin           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "../cub3d_data.h"
#include "../consts.h"
#include "ray.h"
#include "../renderer/render.h"

t_cardinal_dir	get_cardinal(t_ray *ray)
{
	if (ray->side == NORTH)
	{
		if (ray->dir_x < 0)
			return (WEST);
		else
			return (EAST);
	}
	else
	{
		if (ray->dir_y > 0)
			return (SOUTH);
		else
			return (NORTH);
	}
}

static int	get_color(t_cardinal_dir dir)
{
	int	color;

	if (dir == NORTH)
		color = 0x0000ff;
	else if (dir == SOUTH)
		color = 0x00ff00;
	else if (dir == WEST)
		color = 0xff0000;
	else if (dir == EAST)
		color = 0xffeb3b;
	else
		color = 0xff53ff;
	return (color);
}

void	render_walls(t_cub3d_data *data, t_ray *ray, int x)
{
	t_cardinal_dir	dir;
	int				tex_x;
	unsigned int	color;
	double			step;
	double			pos;

	dir = get_cardinal(ray);
	tex_x = (int)(ray->wall_x * TEXTURE_SIZE);
	if ((ray->side == NORTH && ray->dir_x < 0)
		|| (ray->side == SOUTH && ray->dir_y > 0))
		tex_x = TEXTURE_SIZE - tex_x - 1;
	step = 1.0 * TEXTURE_SIZE / ray->wall_height;
	pos = (ray->draw_start - HEIGHT / 2 + ray->wall_height / 2) * step;
	while (ray->draw_start < ray->draw_end)
	{
		pos += step;
		color = get_color(dir);
		(void)pos;
		matrix_set(data, x, ray->draw_start, color);
		ray->draw_start++;
	}
}