cub3d/src/raycast/render.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   render.c                                           :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: tchampio <tchampio@student.42lehavre.fr>   +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/07/30 12:50:10 by tchampio          #+#    #+#             */
/*   Updated: 2025/07/30 16:38:59 by tchampio         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

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

int	get_cardinal(t_ray *ray)
{
	if (ray->side == 0)
	{
		if (ray->dir_x < 0)
			return (2);
		else
			return (3);
	}
	else
	{
		if (ray->dir_y > 0)
			return (1);
		else
			return (0);
	}
}

/*
	*	Dir values are:
	*	0: North
	*	1: South
	*	2: West
	*	3: East
*/
void	render_walls(t_cub3d_data *data, t_ray *ray, int x)
{
	int				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 == 0 && ray->dir_x < 0)
		|| (ray->side == 1 && 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 = 0x0000ff;
		(void)dir;
		(void)pos;
		data->screen_matrix[ray->draw_start][x] = color;
		ray->draw_start++;
	}
}