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calc_raycast.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* calc_raycast.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: lbrandy <[email protected]> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2021/03/21 14:39:02 by lbrandy #+# #+# */
/* Updated: 2021/04/02 18:44:37 by lbrandy ### ########.fr */
/* */
/* ************************************************************************** */
#include "cub3d.h"
void init_step(t_raycast *ray, t_pos *pos)
{
if (ray->raydir_x < 0)
{
ray->step_x = -1;
ray->sidedist_x = (pos->pos_x - ray->map_x) * ray->deltadist_x;
}
else
{
ray->step_x = 1;
ray->sidedist_x = (ray->map_x + 1.0 - pos->pos_x) * ray->deltadist_x;
}
if (ray->raydir_y < 0)
{
ray->step_y = -1;
ray->sidedist_y = (pos->pos_y - ray->map_y) * ray->deltadist_y;
}
else
{
ray->step_y = 1;
ray->sidedist_y = (ray->map_y + 1.0 - pos->pos_y) * ray->deltadist_y;
}
}
void init_raycast(t_raycast *raycast, int x, int w, t_pos *pos)
{
raycast->camera_x = 2 * x / (double)w - 1;
raycast->raydir_x = pos->dir_x + pos->plane_x * raycast->camera_x;
raycast->raydir_y = pos->dir_y + pos->plane_y * raycast->camera_x;
raycast->map_x = (int)pos->pos_x;
raycast->map_y = (int)pos->pos_y;
if (raycast->raydir_y == 0)
raycast->deltadist_x = 0;
else
{
if (raycast->raydir_x == 0)
raycast->deltadist_x = 1;
else
raycast->deltadist_x = fabs(1 / raycast->raydir_x);
}
if (raycast->raydir_x == 0)
raycast->deltadist_y = 0;
else
{
if (raycast->raydir_y == 0)
raycast->deltadist_y = 1;
else
raycast->deltadist_y = fabs(1 / raycast->raydir_y);
}
raycast->hit = 0;
raycast->walldist = 0;
}
void calc_dda(t_raycast *ray, char **map, t_pos *p)
{
while (ray->hit == 0)
{
if (ray->sidedist_x < ray->sidedist_y)
{
ray->sidedist_x += ray->deltadist_x;
ray->map_x += ray->step_x;
ray->side = 0;
}
else
{
ray->sidedist_y += ray->deltadist_y;
ray->map_y += ray->step_y;
ray->side = 1;
}
if (map[ray->map_x][ray->map_y] == '1')
ray->hit = 1;
}
if (ray->side == 0)
ray->walldist = (ray->map_x - p->pos_x
+ (1 - ray->step_x) / 2) / ray->raydir_x;
else
ray->walldist = (ray->map_y - p->pos_y
+ (1 - ray->step_y) / 2) / ray->raydir_y;
}
static void tex_params(t_all *all, t_draw *draw)
{
if (all->raycast->side == 0 && all->raycast->step_x == -1)
{
draw->tex_width = all->no->width;
draw->tex_height = all->no->height;
}
if (all->raycast->side == 0 && all->raycast->step_x == 1)
{
draw->tex_width = all->so->width;
draw->tex_height = all->so->height;
}
if (all->raycast->side == 1 && all->raycast->step_y == -1)
{
draw->tex_width = all->we->width;
draw->tex_height = all->we->height;
}
if (all->raycast->side == 1 && all->raycast->step_y == 1)
{
draw->tex_width = all->ea->width;
draw->tex_height = all->ea->height;
}
}
void init_draw(t_draw *draw, t_raycast *r, t_all *all, t_pos *p)
{
draw->color = 0;
tex_params(all, draw);
draw->line_h = (int)(all->textures->x * 0.66 / r->walldist);
draw->start = -draw->line_h / 2 + all->textures->y / 2;
if (draw->start < 0)
draw->start = 0;
draw->end = draw->line_h / 2 + all->textures->y / 2;
if (draw->end >= all->textures->y)
draw->end = all->textures->y - 1;
if (r->side == 0)
draw->wall_x = p->pos_y + r->walldist * r->raydir_y;
else
draw->wall_x = p->pos_x + r->walldist * r->raydir_x;
draw->wall_x -= floor((draw->wall_x));
draw->tex_x = (int)(draw->wall_x * (double)draw->tex_width);
if (r->side == 0 && r->raydir_x > 0)
draw->tex_x = draw->tex_width - draw->tex_x - 1;
if (r->side == 1 && r->raydir_y < 0)
draw->tex_x = draw->tex_width - draw->tex_x - 1;
draw->step = 1.0 * draw->tex_height / draw->line_h;
draw->tex_pos = (draw->start - all->textures->y / 2
+ draw->line_h / 2) * draw->step;
}