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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_raycasting.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: rbousset <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/02/14 17:22:57 by rbousset #+# #+# */
/* Updated: 2020/02/14 17:23:42 by rbousset ### ########lyon.fr */
/* */
/* ************************************************************************** */
#include <cub3d.h>
#include <stdint.h>
static void
ft_put_floor_tex(uint16_t y, uint16_t x, t_cub *cl)
{
cl->img.ptr[x * 4 + (cl->img.sizeline * y)] =
(uint8_t)cl->tlist[6].ptr[cl->tlist[6].tex_x * 4 + 4 *
cl->tlist[6].img_h * cl->tlist[6].tex_y];
cl->img.ptr[x * 4 + (cl->img.sizeline * y) + 1] =
(uint8_t)cl->tlist[6].ptr[cl->tlist[6].tex_x * 4 + 4 *
cl->tlist[6].img_h * cl->tlist[6].tex_y + 1];
cl->img.ptr[x * 4 + (cl->img.sizeline * y) + 2] =
(uint8_t)cl->tlist[6].ptr[cl->tlist[6].tex_x * 4 + 4 *
cl->tlist[6].img_h * cl->tlist[6].tex_y + 2];
cl->img.ptr[x * 4 + cl->wlist.x_size * y + 3] = (char)0;
}
static void
ft_floor_cast_loop(uint16_t y, uint16_t x, t_ray *rl, t_cub *cl)
{
rl->x_cell = (int32_t)(rl->x_floor);
rl->y_cell = (int32_t)(rl->y_floor);
cl->tlist[6].tex_y = (int32_t)(cl->tlist[6].img_w
* (rl->x_floor - rl->x_cell)) % (cl->tlist[6].img_w);
cl->tlist[6].tex_x = (int32_t)(cl->tlist[6].img_h
* (rl->y_floor - rl->y_cell)) % (cl->tlist[6].img_h);
rl->x_floor += cl->mlist.x_floor_step;
rl->y_floor += cl->mlist.y_floor_step;
ft_put_floor_tex(y, x, cl);
}
void
ft_floor_cast(uint16_t y, t_cub *cl)
{
t_ray *rl;
uint16_t x;
rl = &cl->rlist;
rl->x_f_ray_dir = cl->plist.dir_x - cl->plist.plane_x;
rl->y_f_ray_dir = cl->plist.dir_y - cl->plist.plane_y;
rl->x_f_ray_dir_bis = cl->plist.dir_x + cl->plist.plane_x;
rl->y_f_ray_dir_bis = cl->plist.dir_y + cl->plist.plane_y;
rl->p = y - cl->wlist.y_size / 2;
cl->plist.pos_z = 0.5 * cl->wlist.y_size;
rl->row_dist = cl->plist.pos_z / rl->p;
cl->mlist.x_floor_step = rl->row_dist *
(rl->x_f_ray_dir_bis - rl->x_f_ray_dir) / cl->wlist.x_size;
cl->mlist.y_floor_step = rl->row_dist *
(rl->y_f_ray_dir_bis - rl->y_f_ray_dir) / cl->wlist.x_size;
rl->x_floor = cl->plist.pos_y + rl->row_dist * rl->x_f_ray_dir;
rl->y_floor = cl->plist.pos_x + rl->row_dist * rl->y_f_ray_dir;
x = 0;
while (++x < cl->wlist.x_size)
{
ft_floor_cast_loop(y, x, rl, cl);
}
}
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