83 lines
2.9 KiB
C
83 lines
2.9 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* render_floor.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: qmennen <qmennen@student.codam.nl> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2025/05/14 13:06:39 by whaffman #+# #+# */
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/* Updated: 2025/06/05 17:01:36 by qmennen ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "cub3d.h"
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static t_vec2 calc_floor_step(t_game *game,
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double row_dist, t_vec2 left_ray, t_vec2 right_ray)
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{
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t_vec2 floor_step;
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floor_step = sub(right_ray, left_ray);
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floor_step = mul(floor_step, row_dist);
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floor_step = mul(floor_step, 1.0 / game->screen->width);
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return (floor_step);
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}
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static void draw_floor_ceiling_pixel(t_game *game,
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t_vec2_int coord, double row_dist, t_vec2 floor_pos)
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{
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const t_vec2_int tex = vec2_to_int(mul(get_fraction(floor_pos), game->map->texture_floor->width));
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int color;
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if (game->map->texture_floor == NULL)
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color = game->map->floor_color << 8 | (int)(1.0 / row_dist * 255);
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else
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color = get_texture_color(game->map->texture_floor,
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(t_render){row_dist, 0, 0}, tex);
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mlx_put_pixel(game->screen->img,
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coord.x, coord.y, color);
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if (game->map->texture_ceiling == NULL)
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color = game->map->ceiling_color << 8 | (int)(1.0 / row_dist * 255);
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else
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color = get_texture_color(game->map->texture_ceiling,
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(t_render){row_dist, 0, 0}, tex);
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mlx_put_pixel(game->screen->img,
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coord.x, game->screen->height - coord.y - 1, color);
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}
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static void draw_floor_row(t_game *game,
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t_vec2_int coord, t_vec2 left_ray, t_vec2 right_ray)
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{
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double row_dist;
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t_vec2 floor_step;
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t_vec2 floor_pos;
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row_dist = 0.5 * game->screen->height;
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row_dist /= (coord.y - 0.5 * game->screen->height);
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floor_step = calc_floor_step(game, row_dist, left_ray, right_ray);
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floor_pos = add(game->player->pos, mul(left_ray, row_dist));
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if (isinf(floor_pos.x) || isinf(floor_pos.y))
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return ;
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while (coord.x < game->screen->width)
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{
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draw_floor_ceiling_pixel(game, coord, row_dist, floor_pos);
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floor_pos = add(floor_pos, floor_step);
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coord.x++;
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}
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}
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void draw_floor(t_game *game)
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{
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const t_vec2 left_ray = sub(game->player->dir, game->player->camera);
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const t_vec2 right_ray = add(game->player->dir, game->player->camera);
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t_vec2_int coord;
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coord.y = game->screen->height / 2;
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coord.x = 0;
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while (coord.y < game->screen->height)
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{
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draw_floor_row(game, coord, left_ray, right_ray);
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coord.y++;
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}
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}
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