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Change: Add path cache for ships.

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This commit is contained in:
Peter Nelson
2019-01-14 23:33:42 +00:00
committed by PeterN
parent 1c725fce47
commit 81330b8d6e
12 changed files with 67 additions and 21 deletions
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18
src/pathfinder/yapf/yapf_ship.cpp
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@@ -54,7 +54,7 @@ public:
return 'w';
}
static Trackdir ChooseShipTrack(const Ship *v, TileIndex tile, DiagDirection enterdir, TrackBits tracks, bool &path_found)
static Trackdir ChooseShipTrack(const Ship *v, TileIndex tile, DiagDirection enterdir, TrackBits tracks, bool &path_found, ShipPathCache &path_cache)
{
/* handle special case - when next tile is destination tile */
if (tile == v->dest_tile) {
@@ -90,9 +90,17 @@ public:
Node *pNode = pf.GetBestNode();
if (pNode != NULL) {
uint steps = 0;
for (Node *n = pNode; n->m_parent != NULL; n = n->m_parent) steps++;
/* walk through the path back to the origin */
Node *pPrevNode = NULL;
while (pNode->m_parent != NULL) {
if (steps > 1 && --steps < YAPF_SHIP_PATH_CACHE_LENGTH) {
TrackdirByte td;
td = pNode->GetTrackdir();
path_cache.push_front(td);
}
pPrevNode = pNode;
pNode = pNode->m_parent;
}
@@ -100,6 +108,8 @@ public:
Node &best_next_node = *pPrevNode;
assert(best_next_node.GetTile() == tile);
next_trackdir = best_next_node.GetTrackdir();
/* remove last element for the special case when tile == dest_tile */
if (path_found && !path_cache.empty()) path_cache.pop_back();
}
return next_trackdir;
}
@@ -222,10 +232,10 @@ struct CYapfShip2 : CYapfT<CYapfShip_TypesT<CYapfShip2, CFollowTrackWater , C
struct CYapfShip3 : CYapfT<CYapfShip_TypesT<CYapfShip3, CFollowTrackWaterNo90, CShipNodeListTrackDir> > {};
/** Ship controller helper - path finder invoker */
Track YapfShipChooseTrack(const Ship *v, TileIndex tile, DiagDirection enterdir, TrackBits tracks, bool &path_found)
Track YapfShipChooseTrack(const Ship *v, TileIndex tile, DiagDirection enterdir, TrackBits tracks, bool &path_found, ShipPathCache &path_cache)
{
/* default is YAPF type 2 */
typedef Trackdir (*PfnChooseShipTrack)(const Ship*, TileIndex, DiagDirection, TrackBits, bool &path_found);
typedef Trackdir (*PfnChooseShipTrack)(const Ship*, TileIndex, DiagDirection, TrackBits, bool &path_found, ShipPathCache &path_cache);
PfnChooseShipTrack pfnChooseShipTrack = CYapfShip2::ChooseShipTrack; // default: ExitDir, allow 90-deg
/* check if non-default YAPF type needed */
@@ -235,7 +245,7 @@ Track YapfShipChooseTrack(const Ship *v, TileIndex tile, DiagDirection enterdir,
pfnChooseShipTrack = &CYapfShip1::ChooseShipTrack; // Trackdir, allow 90-deg
}
Trackdir td_ret = pfnChooseShipTrack(v, tile, enterdir, tracks, path_found);
Trackdir td_ret = pfnChooseShipTrack(v, tile, enterdir, tracks, path_found, path_cache);
return (td_ret != INVALID_TRACKDIR) ? TrackdirToTrack(td_ret) : INVALID_TRACK;
}