153 lines
3.8 KiB
C
153 lines
3.8 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* dda.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: erey-bet <marvin@42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2023/05/02 15:49:00 by erey-bet #+# #+# */
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/* Updated: 2023/05/03 17:37:31 by erey-bet ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "game.h"
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double ft_abs(double nb)
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{
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if (nb < 0)
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return (-nb);
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return (nb);
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}
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void init_dda(t_game *game, t_dda *dda)
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{
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t_ray *ray;
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t_ply *ply;
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ray = &game->ray;
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ply = &game->ply;
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dda->map_x = (int)ply->pos_x;
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dda->map_y = (int)ply->pos_y;
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if (ray->dir_x == 0)
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dda->delta_dist_x = 1e30;
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else
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dda->delta_dist_x = ft_abs(1 / ray->dir_x);
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if (ray->dir_y == 0)
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dda->delta_dist_y = 1e30;
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else
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dda->delta_dist_y = ft_abs(1 / ray->dir_y);
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dda->step_x = 1;
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dda->step_y = 1;
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if (ray->dir_x < 0)
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{
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dda->step_x = -1;
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dda->side_dist_x = (ply->pos_x - dda->map_x) * dda->delta_dist_x;
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}
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else
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dda->side_dist_x = (dda->map_x + 1.0 - ply->pos_x) * dda->delta_dist_x;
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if (ray->dir_y < 0)
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{
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dda->step_y = -1;
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dda->side_dist_y = (ply->pos_y - dda->map_y) * dda->delta_dist_y;
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}
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else
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dda->side_dist_y = (dda->map_y + 1.0 - ply->pos_y) * dda->delta_dist_y;
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dda->hit = 0;
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}
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void loop_dda(t_game *game, t_dda *dda)
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{
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while (dda->hit == 0)
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{
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if (dda->side_dist_x < dda->side_dist_y)
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{
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dda->side_dist_x += dda->delta_dist_x;
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dda->map_x += dda->step_x;
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dda->side = 0;
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}
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else
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{
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dda->side_dist_y += dda->delta_dist_y;
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dda->map_y += dda->step_y;
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dda->side = 1;
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}
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if (dda->map_x >= 0 && dda->map_y >= 0 &&
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game->map.map[dda->map_y][dda->map_x] == '1')
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dda->hit = 1;
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}
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}
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void ray_dda(t_dda *dda)
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{
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if(dda->side == 0)
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dda->perp_wall_dist = dda->side_dist_x - dda->delta_dist_x;
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else
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dda->perp_wall_dist = dda->side_dist_y - dda->delta_dist_y;
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if (dda->perp_wall_dist == 0)
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dda->perp_wall_dist = 1e30;
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dda->line_height = (int)(HEIGHT / dda->perp_wall_dist);
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dda->draw_start = -(dda->line_height) / 2 + HEIGHT / 2;
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if(dda->draw_start < 0)
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dda->draw_start = 0;
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dda->draw_end = dda->line_height / 2 + HEIGHT / 2;
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if(dda->draw_end >= HEIGHT)
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dda->draw_end = HEIGHT - 1;
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}
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unsigned int get_rgba(int r, int g, int b, int a)
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{
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return (a << 24 | r << 16 | g << 8 | b);
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}
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void draw_line(t_game *game, t_dda *dda, unsigned int color, int x)
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{
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int y;
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unsigned int white;
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white = 0xFFFFFFFF;
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y = 0;
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while (y < HEIGHT)
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{
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if (y < dda->draw_start)
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{
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mlx_put_pixel(game->window, x, y, white);
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}
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else if (y >= dda->draw_start && y <= dda->draw_end)
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{
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mlx_put_pixel(game->window, x, y, color);
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}
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else if (y > dda->draw_end)
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{
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mlx_put_pixel(game->window, x, y, white);
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}
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y ++;
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}
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}
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void draw_dda(t_game *game, t_dda *dda, int x)
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{
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unsigned int color;
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if (dda->step_x == -1 && dda->side == 0) // EAST
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color = get_rgba(255, 0, 0, 255);
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else if (dda->step_x == 1 && dda->side == 0) // WEST
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color = get_rgba(0, 255, 0, 255);
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else if (dda->step_y == 1 && dda->side == 1) // NORTH
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color = get_rgba(0, 0, 255, 255);
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else // SOUTH
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color = get_rgba(100, 100, 100, 255);
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draw_line(game, dda, color, x);
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}
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void dda(t_game *game, int x)
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{
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t_dda dda;
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init_dda(game, &dda);
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loop_dda(game, &dda);
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ray_dda(&dda);
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draw_dda(game, &dda, x);
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}
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