/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   render_utils.c                                     :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: mcolonna <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/10/24 14:26:22 by grobledo          #+#    #+#             */
/*   Updated: 2024/11/18 14:33:01 by mcolonna         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "render_utils.h"

#include "const.h"
#include "global.h"

void	calculate_texdir_and_wallx(t_ray *ray)
{
	if (ray->side && ray->dir.y < 0)
		ray->texdir = NORTH;
	if (ray->side && ray->dir.y >= 0)
		ray->texdir = SOUTH;
	if (!ray->side && ray->dir.x < 0)
		ray->texdir = EAST;
	if (!ray->side && ray->dir.x >= 0)
		ray->texdir = WEST;
	if (!ray->side)
		ray->wallx = g_map.player.pos.y + ray->perpwalldist \
						* ray->dir.y;
	else
		ray->wallx = g_map.player.pos.x + ray->perpwalldist \
						* ray->dir.x;
	if (ray->texdir == SOUTH || ray->texdir == EAST)
		ray->wallx = -ray->wallx;
	ray->wallx -= floor((ray->wallx));
}

void	draw_vertical_line_end(t_ray *ray, int draw_start, int draw_end,
			u_int32_t *img_data)
{
	u_int32_t		color;
	u_int32_t		*texture_data;
	int				texx;
	int				texy;
	const t_texture	texture = g_map.textures[ray->texdir];

	ray->y = -1;
	while (++ray->y < SCREEN_HEIGHT)
	{
		if (ray->y < draw_start)
			img_data[ray->y * SCREEN_WIDTH + ray->x] = g_map.color_ceiling;
		else if (ray->y < draw_end)
		{
			texy = ((ray->y - ((draw_start - draw_end) / 2 + SCREEN_HEIGHT / 2))
					* texture.height) / (draw_end - draw_start);
			texx = (int)(ray->wallx * (double)texture.width);
			texture_data = get_data_addr(texture.image);
			color = texture_data[texy * texture.width + texx];
			img_data[ray->y * SCREEN_WIDTH + ray->x] = color;
		}
		else
			img_data[ray->y * SCREEN_WIDTH + ray->x] = g_map.color_floor;
	}
}