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raycast.c
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raycast.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* raycast.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: vilibert <vilibert@student.s19.be> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2024/03/11 12:12:11 by vilibert #+# #+# */
/* Updated: 2024/03/15 12:28:17 by vilibert ### ########.fr */
/* */
/* ************************************************************************** */
#include "cub3d.h"
void resize_render(t_data *data);
void draw_wall_floor(t_data *data);
void init_ray_param(t_data *data, t_raycast *rc);
void step_init(t_data *data, t_raycast *rc);
void dda(t_data *data, t_raycast *rc);
void get_tex_ptr(t_data *data, t_raycast *rc);
static int correct_color(u_int8_t *pixel)
{
int rgba;
rgba = 0;
rgba += pixel[0] << 24;
rgba += pixel[1] << 16;
rgba += pixel[2] << 8;
rgba += pixel[3];
return (rgba);
}
static void ray_to_img(t_data *data, t_raycast *rc)
{
double step;
double tex_pos;
u_int32_t color;
int y;
step = 1.0 * data->map->no->height / rc->line_height;
tex_pos = (rc->draw_start - data->height / 2 + rc->line_height / 2) * step;
y = rc->draw_start;
while (y <= rc->draw_end)
{
rc->tex.y = (int)tex_pos & (data->map->no->height - 1);
tex_pos += step;
color = correct_color((u_int8_t *)&((u_int32_t *)rc->t->pixels)
[rc->t->width * rc->tex.y + (rc->t->width - rc->tex.x - 1)]);
mlx_put_pixel(data->img, rc->x, y, color);
y++;
}
}
static void get_screen_coord(t_data *data, t_raycast *rc)
{
rc->line_height = (int)(data->height / rc->perp_wall_dist);
rc->draw_start = -rc->line_height / 2 + data->height / 2;
if (rc->draw_start < 0)
rc->draw_start = 0;
rc->draw_end = rc->line_height / 2 + data->height / 2;
if (rc->draw_end >= data->height)
rc->draw_end = data->height - 1;
}
static void get_tex_coord(t_data *data, t_raycast *rc)
{
double wall_x;
if (rc->side == 0)
wall_x = data->player->pos.y + rc->perp_wall_dist * rc->ray_dir.y;
else
wall_x = data->player->pos.x + rc->perp_wall_dist * rc->ray_dir.x;
wall_x -= floor((wall_x));
rc->tex.x = (int)(wall_x * (double)(rc->t->width));
if (rc->side == 0 && rc->ray_dir.x > 0)
rc->tex.x = rc->t->width - rc->tex.x - 1;
if (rc->side == 1 && rc->ray_dir.y < 0)
rc->tex.x = rc->t->width - rc->tex.x - 1;
}
void raycast(t_data *data)
{
t_raycast rc;
resize_render(data);
draw_wall_floor(data);
rc.x = 0;
while (rc.x < data->width)
{
init_ray_param(data, &rc);
step_init(data, &rc);
dda(data, &rc);
if (rc.side == 0)
rc.perp_wall_dist = (rc.side_dist.x - rc.delta_dist.x);
else
rc.perp_wall_dist = (rc.side_dist.y - rc.delta_dist.y);
get_screen_coord(data, &rc);
get_tex_ptr(data, &rc);
get_tex_coord(data, &rc);
ray_to_img(data, &rc);
rc.x += 1;
}
}