unsigned int *tmap = tunnel_map + (starty + yoffs) * vxsz + xoffs;
unsigned char *fog = tunnel_fog + (starty + yoffs) * vxsz + xoffs;
unsigned int *tmap = tunnel_map + (starty + yoffs) * vxsz + xoffs;
unsigned char *fog = tunnel_fog + (starty + yoffs) * vxsz + xoffs;