src/ft_draw_sprite.c


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#include <libft.h>
#include <cub3d.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>

void
ft_draw_verline_sprite(t_cub *cl, int x, int y, int tex_y)
{
  if (cl->tlist[4].tex_x)
    cl->img.ptr[x * 4 + (cl->img.sizeline * y)] =
      (char)cl->tlist[4].ptr[cl->tlist[4].tex_x * 4 + 4 *
                             cl->tlist[4].img_h * tex_y];
    cl->img.ptr[x * 4 + (cl->img.sizeline * y) + 1] =
      (char)cl->tlist[4].ptr[cl->tlist[4].tex_x * 4 + 4 *
                             cl->tlist[4].img_h * tex_y + 1];
    cl->img.ptr[x * 4 + (cl->img.sizeline * y) + 2] =
      (char)cl->tlist[4].ptr[cl->tlist[4].tex_x * 4 + 4 *
      cl->tlist[4].img_h * tex_y + 2];
    cl->img.ptr[x * 4 + cl->wlist->x_size * y + 3] = (char)0;
}

void
  ft_draw_sprite(t_cub *cl, int x)
{
  int hor_it;/*y*/
  int d;
  int tex_y;

  hor_it = cl->sp_list.s_start_y;
  while (hor_it < cl->sp_list.s_end_y)
  {
    d = hor_it * 256 - cl->wlist->y_size * 128 + cl->rlist.line_h * 128;
    d = (d <= 0) ? (-d) : (d);
    tex_y = ((d * cl->tlist[4].img_h) / cl->rlist.line_h) / 256;
    (tex_y < 0) ? (tex_y = 0) : 0;
    ft_draw_verline_sprite(cl, x, hor_it, tex_y);
    hor_it++;
  }
}