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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 <libft.h>
#include <cub3d.h>
#include <stdint.h>
#include <stdlib.h>
#include <math.h>
/* static void */
/* ft_calc_sprite_norme(t_cub *cl) */
/* { */
/* if (cl.sp_list.s_start_y < 0) */
/* cl.sp_list.s_start_y = 0; */
/* cl.sp_list.s_end_y = cl.sp_list.s_h / 2 + cl.wlist.y_size / 2; */
/* if (cl.sp_list.s_end_y > (int)cl.wlist.y_size) */
/* cl.sp_list.s_end_y = cl.wlist.y_size - 1; */
/* cl.sp_list.s_w = abs((int)(cl.wlist.x_size */
/* * cl.sp_list.sprite_transform_y)); /\*sprite width*\/ */
/* cl.sp_list.s_start_x = -cl.sp_list.s_w / 2 + cl.sp_list.s_screen_x; */
/* if (cl.sp_list.s_start_x < 0) */
/* cl.sp_list.s_start_y = 0; */
/* cl.sp_list.s_end_x = cl.sp_list.s_w / 2 + cl.wlist.x_size; */
/* if (cl.sp_list.s_end_x < (int)cl.wlist.x_size) */
/* cl.sp_list.s_end_x = cl.wlist.x_size - 1; */
/* } */
/* static void */
/* ft_calc_sprite(t_cub *cl) */
/* { */
/* cl.sp_list.s_x = cl.sp_list.s_pos_x - cl.plist.pos_x; */
/* cl.sp_list.s_y = cl.sp_list.s_pos_y - cl.plist.pos_y; */
/* cl.sp_list.inv_c_m = 1.0 / (cl.plist.plane_x * cl.plist.dir_x */
/* - cl.plist.dir_y * cl.plist.plane_y); */
/* cl.sp_list.sprite_transform_x = cl.sp_list.inv_c_m */
/* * (cl.plist.dir_y * cl.sp_list.s_x */
/* - cl.plist.dir_x * cl.sp_list.s_y); */
/* cl.sp_list.sprite_transform_y = cl.sp_list.inv_c_m */
/* * (cl.plist.plane_y * cl.sp_list.s_x */
/* - cl.plist.plane_x * cl.sp_list.s_y); */
/* cl.sp_list.s_screen_x = (int)((cl.wlist.y_size / 2) */
/* * (1 + cl.sp_list.sprite_transform_x */
/* / cl.sp_list.sprite_transform_y)); */
/* cl.sp_list.s_h = */
/* abs((int)(cl.wlist.y_size * cl.sp_list.sprite_transform_y)); */
/* cl.sp_list.s_start_y = -cl.sp_list.s_h / 2 + cl.wlist.y_size / 2; */
/* ft_calc_sprite_norme(cl); */
/* } */
void
ft_calc_tex(t_cub *clist)
{
if (clist.rlist.side == 0)
clist.rlist.wall_hit_x = (clist.plist.pos_x) +
clist.rlist.wall_dist * clist.rlist.y_ray_dir;
else
clist.rlist.wall_hit_x = (clist.plist.pos_y) +
clist.rlist.wall_dist * clist.rlist.x_ray_dir;
clist.rlist.wall_hit_x -= floor(clist.rlist.wall_hit_x);
clist.tlist[clist.w_side].tex_x = (int)(clist.rlist.wall_hit_x *
(double)clist.tlist[clist.w_side].img_w);
if (clist.rlist.side == 0 && clist.rlist.x_ray_dir > 0)
clist.tlist[clist.w_side].tex_x = clist.tlist[clist.w_side].img_w
- clist.tlist[clist.w_side].tex_x - 1;
else if (clist.rlist.side == 1 && clist.rlist.y_ray_dir < 0)
clist.tlist[clist.w_side].tex_x = clist.tlist[clist.w_side].img_w
- clist.tlist[clist.w_side].tex_x - 1;
}
static void
ft_initray(t_cub *cl, uint16_t i)
{
t_win *wl;
t_player *pl;
wl = cl.wlist;
pl = cl.plist;
pl.cam_x = 2 * i / (float)(wl.x_size) - 1;
cl.rlist.x_ray_pos = pl.pos_y;
cl.rlist.y_ray_pos = pl.pos_x;
cl.rlist.x_ray_dir = pl.dir_x + pl.plane_x *
pl.cam_x;
cl.rlist.y_ray_dir = pl.dir_y + pl.plane_y *
pl.cam_x;
cl.rlist.sqx = (int16_t)cl.rlist.x_ray_pos;
cl.rlist.sqy = (int16_t)cl.rlist.y_ray_pos;
ft_detect(cl);
if (cl.rlist.side == 0)
{
cl.rlist.wall_dist = (cl.rlist.sqx - cl.rlist.x_ray_pos +
(1 - cl.mlist.x_step) / 2) / cl.rlist.x_ray_dir;
}
else
cl.rlist.wall_dist = (cl.rlist.sqy - cl.rlist.y_ray_pos +
(1 - cl.mlist.y_step) / 2) / cl.rlist.y_ray_dir;
}
void
ft_castray(t_cub *cl)
{
uint16_t i;
t_win *wl;
i = 0;
wl = cl.wlist;
while (i < wl.x_size)
{
ft_initray(cl, i);
cl.rlist.line_h = (int16_t)(wl.y_size / cl.rlist.wall_dist);
cl.rlist.wall_t = -cl.rlist.line_h / 2 + wl.y_size / 2;
if (cl.rlist.wall_t < 0)
cl.rlist.wall_t = 0;
cl.rlist.wall_b = cl.rlist.line_h / 2 + wl.y_size / 2;
if (cl.rlist.wall_b >= (float)wl.y_size)
cl.rlist.wall_b = wl.y_size - 1;
ft_choose_tex(cl);
ft_calc_tex(cl);
/* ft_calc_sprite(cl); */
/* ft_draw_sprite(cl , i); */
ft_draw_verline(cl, i, cl.rlist.wall_t, cl.rlist.wall_b);
i++;
}
}
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