set_texture_x_coordinate.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   set_texture_x_coordinate.c                         :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: kamitsui <kamitsui@student.42tokyo.jp>     +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/10/17 19:55:06 by kamitsui          #+#    #+#             */
/*   Updated: 2024/12/21 09:43:19 by kamitsui         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include "cub3d.h"
 
t_type_wall get_texture_direction(
                        int type_of_grid_line, t_vector ray_dir)
{
    if (type_of_grid_line == 1)
    {
        if (ray_dir.y < 0)
            return (ENUM_SOUTH);
        else
            return (ENUM_NORTH);
    }
    else
    {
        if (ray_dir.x < 0)
            return (ENUM_EAST);
        else
            return (ENUM_WEST);
    }
}
// reference type_cub3d.h
//typedef enum e_type_wall {
//  NORTH,
//  WEST,
//  EAST,
//  SOUTH
//} t_type_wall;
 
void    set_texture_x_coordinate(t_frame *frame, int x)
{
    double      wall_x;
    t_vector    view_point;
    t_vector    ray_dir;
    t_dda       *dda;
    t_type_wall type_wall;
 
    dda = &frame->dda;
    view_point = frame->player->view_point;
    ray_dir = frame->ray_cast.ray_dir;
    if (dda->type_of_grid_line == 0)
        wall_x = view_point.y + dda->perp_wall_dist * ray_dir.y;
    else
        wall_x = view_point.x + dda->perp_wall_dist * ray_dir.x;
    wall_x -= floor(wall_x);
    type_wall = get_texture_direction(dda->type_of_grid_line, ray_dir);
    dda->texture = frame->texture[type_wall];
    dda->tex_x = (int)(wall_x * (double)dda->texture.width);
    if (dda->type_of_grid_line == 0 && ray_dir.x < 0)
        dda->tex_x = dda->texture.width - dda->tex_x - 1;
    if (dda->type_of_grid_line == 1 && ray_dir.y >= 0)
        dda->tex_x = dda->texture.width - dda->tex_x - 1;
    (void)x;
}
//  debug code
    //debug_texture_coordinate(frame->debug.fd, wall_x, frame,
    //  "end set_texture_x_coordinage()");
//  debug_put_texture_image(frame);
//  Note : comment out in source file because using forbidden function
//
// reference cub3.h
//typedef struct s_dda {
//  int     type_of_grid_line;
//  double  perp_wall_dist;
//  int     tex_x;
//  t_texture   texture;
//} t_dda;