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

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   render.c                                           :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: dbarba-v <dbarba-v@student.42madrid.com    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2026/01/13 11:33:22 by gamorcil          #+#    #+#             */
/*   Updated: 2026/01/19 10:48:45 by dbarba-v         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "MLX42/MLX42.h"
#include "cub3d.h"
#include "game.h"
#include "libft.h"
#include <malloc.h>

static void	set_draw_range(int wall_size, int *draw_range)
{
	draw_range[0] = -wall_size / 2 + WIN_HEIGHT / 2;
	if (draw_range[0] < 0)
		draw_range[0] = 0;
	draw_range[1] = wall_size / 2 + WIN_HEIGHT / 2;
	if (draw_range[1] >= WIN_HEIGHT)
		draw_range[1] = WIN_HEIGHT - 1;
}

static void	paint_pixels(t_render *render_info, t_game *game, int x)
{
	t_paint	aux;

	aux.tex = get_current_texture(render_info, game);
	aux.tex_x = calculate_tex_x(render_info, game, aux.tex);
	aux.step = 1.0 * aux.tex->height / render_info->wall_size;
	aux.texture_position = (render_info->draw_range[0] - WIN_HEIGHT / 2
			+ render_info->wall_size / 2) * aux.step;
	aux.y = render_info->draw_range[0];
	while (aux.y <= render_info->draw_range[1])
	{
		aux.tex_y = (int)aux.texture_position & (aux.tex->height - 1);
		aux.texture_position += aux.step;
		mlx_put_pixel(game->resources.walls, x, aux.y,
			get_texture_pixel(aux.tex, aux.tex_x, aux.tex_y));
		aux.y++;
	}
}

static void	draw_column(t_render *render_info, t_game *game, int x)
{
	int	*range;

	range = render_info->draw_range;
	render_info->perp_wall_dist = fix_eye(render_info);
	render_info->wall_size = (int)(WIN_HEIGHT / render_info->perp_wall_dist);
	set_draw_range(render_info->wall_size, range);
	paint_pixels(render_info, game, x);
}

void	clean_walls(mlx_image_t *wall)
{
	int	x;
	int	y;

	y = -1;
	while (++y < WIN_HEIGHT)
	{
		x = -1;
		while (++x < WIN_WIDTH)
		{
			mlx_put_pixel(wall, x, y, 0x00000000);
		}
	}
}

void	render(void *param)
{
	t_game		*game;
	t_render	render_info;
	int			x;

	x = 0;
	game = param;
	ft_bzero(&render_info, sizeof(t_render));
	init_plane(&render_info, game);
	clean_walls(game->resources.walls);
	while (x < WIN_WIDTH)
	{
		ray_dir_calc(&render_info, game, x);
		setup_dda(&render_info, game);
		dda(&render_info, game);
		draw_column(&render_info, game, x);
		x++;
	}
}