463     int dir = 0;  in DoGetDirection()  local
469             dir = E | SE | S;  in DoGetDirection()
471             dir = N | NE | E;  in DoGetDirection()
473             dir = W | NW | N;  in DoGetDirection()
475             dir = W | SW | S;  in DoGetDirection()
478             dir = NE | E | SE;  in DoGetDirection()
480             dir = NW | W | SW;  in DoGetDirection()
482             dir = SE | S | SW;  in DoGetDirection()
484             dir = NE | N | NW;  in DoGetDirection()
486             dir = UNDEFINED;    /* shouldn't happen */  in DoGetDirection()
510             dir = UNDEFINED;    /* shouldn't happen */  in DoGetDirection()
512             dir = (1 << i1 | 1 << i2);  in DoGetDirection()
514     return dir;  in DoGetDirection()
531     int dir;  in GetDirection()  local
535         dir = cache[DIRECTION_CACHE_RANGE + dx][DIRECTION_CACHE_RANGE + dy];  in GetDirection()
536         if (dir == 0) {  in GetDirection()
537             dir = DoGetDirection(dx, dy);  in GetDirection()
538             cache[DIRECTION_CACHE_RANGE + dx][DIRECTION_CACHE_RANGE + dy] = dir;  in GetDirection()
543         dir = DoGetDirection(dx, dy);  in GetDirection()
546     return dir;  in GetDirection()
573     vel->tracker[n].dir = GetDirection(dx, dy);  in FeedTrackers()
575                 dx, dy, vel->tracker[n].dir,  in FeedTrackers()
607     int offset, dir = UNDEFINED, used_offset = -1, age_ms;  in QueryTrackers()  local
633         dir &= tracker->dir;  in QueryTrackers()
634         if (dir == 0) {         /* we've changed octant of movement (e.g. NE → NW) */  in QueryTrackers()