89 lines
2.6 KiB
C
89 lines
2.6 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* raycast.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: pblagoje <marvin@42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2022/05/04 13:54:22 by pblagoje #+# #+# */
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/* Updated: 2022/05/04 13:54:23 by pblagoje ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "cube3d.h"
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static void calcul_img_column(t_game *game, t_rcast *rcast, t_wall *wall)
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{
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int tmp;
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if (rcast->is_x == 1)
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{
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tmp = wall->delta;
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tmp *= -rcast->ray_sign_y;
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tmp /= ft_abs(rcast->slope_x);
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tmp += game->plr.pos.y;
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wall->posx = tmp % rcast->cell;
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}
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else
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{
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tmp = wall->delta;
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tmp *= -rcast->ray_sign_x;
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tmp /= ft_abs(rcast->slope_y);
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tmp += game->plr.pos.x;
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wall->posx = tmp % rcast->cell;
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}
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}
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static void fill_wall_vector(t_rcast *rcast, t_wall *wall)
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{
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int height;
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height = wall->height;
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if (height < 0)
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height = 0;
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wall->limit = 0;
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if (height > rcast->screen_height)
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{
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wall->limit = (height - rcast->screen_height) / 2;
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height = rcast->screen_height;
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}
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rcast->wall.vec.start.y = rcast->screen_height / 2 + height / 2;
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rcast->wall.vec.end.y = rcast->screen_height / 2 - height / 2;
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}
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static void calcul_wall(t_rcast *rcast)
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{
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long int height;
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rcast->wall.vec.start.x = rcast->ray_nb;
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rcast->wall.vec.end.x = rcast->ray_nb;
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if (rcast->is_x == 1)
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rcast->wall.delta = rcast->next_x - rcast->ray_step_x;
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else
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rcast->wall.delta = rcast->next_y - rcast->ray_step_y;
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height = rcast->screen_height * rcast->cell;
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if (rcast->slope_x)
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height *= rcast->slope_x;
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if (rcast->slope_y)
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height *= rcast->slope_y;
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if (rcast->wall.delta && rcast->screen_dist)
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height /= (rcast->wall.delta * rcast->screen_dist);
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rcast->wall.height = ft_abs(height);
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fill_wall_vector(rcast, &rcast->wall);
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}
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void raycast(t_game *game, t_rcast *rcast)
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{
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t_vec ray;
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rcast->ray_nb = 0;
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while (rcast->ray_nb <= rcast->screen_width)
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{
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ray_intersect_wall(game, rcast, &ray);
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calcul_wall(rcast);
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calcul_img_column(game, rcast, &rcast->wall);
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draw_column(game, rcast, &rcast->wall, &game->txt);
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(rcast->ray_nb)++;
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}
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}
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