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(svn r5018) [YAPF] Added some comments to YAPF implementation.

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This commit is contained in:
KUDr
2006-05-29 18:39:42 +00:00
parent 301f4ac856
commit ed48b38619
9 changed files with 171 additions and 74 deletions
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64
yapf/yapf_common.hpp
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@@ -3,28 +3,31 @@
#ifndef YAPF_COMMON_HPP
#define YAPF_COMMON_HPP
/** YAPF origin provider base class - used when origin is one tile / multiple trackdirs */
template <class Types>
class CYapfOriginTileT
{
public:
typedef typename Types::Tpf Tpf;
typedef typename Types::Tpf Tpf; ///< the pathfinder class (derived from THIS class)
typedef typename Types::NodeList::Titem Node; ///< this will be our node type
typedef typename Node::Key Key; ///< key to hash tables
typedef typename Node::Key Key; ///< key to hash tables
protected:
TileIndex m_orgTile;
TrackdirBits m_orgTrackdirs;
TileIndex m_orgTile; ///< origin tile
TrackdirBits m_orgTrackdirs; ///< origin trackdir mask
/// to access inherited path finder
FORCEINLINE Tpf& Yapf() {return *static_cast<Tpf*>(this);}
public:
/// Set origin tile / trackdir mask
void SetOrigin(TileIndex tile, TrackdirBits trackdirs)
{
m_orgTile = tile;
m_orgTrackdirs = trackdirs;
}
/// Called when YAPF needs to place origin nodes into open list
void PfSetStartupNodes()
{
for (TrackdirBits tdb = m_orgTrackdirs; tdb != TRACKDIR_BIT_NONE; tdb = (TrackdirBits)KillFirstBit2x64(tdb)) {
@@ -36,25 +39,28 @@ public:
}
};
/** YAPF origin provider base class - used when there are two tile/trackdir origins */
template <class Types>
class CYapfOriginTileTwoWayT
{
public:
typedef typename Types::Tpf Tpf;
typedef typename Types::Tpf Tpf; ///< the pathfinder class (derived from THIS class)
typedef typename Types::NodeList::Titem Node; ///< this will be our node type
typedef typename Node::Key Key; ///< key to hash tables
typedef typename Node::Key Key; ///< key to hash tables
protected:
TileIndex m_orgTile;
Trackdir m_orgTd;
TileIndex m_revTile;
Trackdir m_revTd;
int m_reverse_penalty;
bool m_treat_first_red_two_way_signal_as_eol;
TileIndex m_orgTile; ///< first origin tile
Trackdir m_orgTd; ///< first origin trackdir
TileIndex m_revTile; ///< second (reversed) origin tile
Trackdir m_revTd; ///< second (reversed) origin trackdir
int m_reverse_penalty; ///< penalty to be added for using the reversed origin
bool m_treat_first_red_two_way_signal_as_eol; ///< in some cases (leaving station) we need to handle first two-way signal differently
/// to access inherited path finder
FORCEINLINE Tpf& Yapf() {return *static_cast<Tpf*>(this);}
public:
/// set origin (tiles, trackdirs, etc.)
void SetOrigin(TileIndex tile, Trackdir td, TileIndex tiler = INVALID_TILE, Trackdir tdr = INVALID_TRACKDIR, int reverse_penalty = 0, bool treat_first_red_two_way_signal_as_eol = true)
{
m_orgTile = tile;
@@ -65,6 +71,7 @@ public:
m_treat_first_red_two_way_signal_as_eol = treat_first_red_two_way_signal_as_eol;
}
/// Called when YAPF needs to place origin nodes into open list
void PfSetStartupNodes()
{
if (m_orgTile != INVALID_TILE && m_orgTd != INVALID_TRACKDIR) {
@@ -80,25 +87,28 @@ public:
}
}
/// return true if first two-way signal should be treated as dead end
FORCEINLINE bool TreatFirstRedTwoWaySignalAsEOL()
{
return Yapf().PfGetSettings().rail_firstred_twoway_eol && m_treat_first_red_two_way_signal_as_eol;
}
};
/** YAPF destination provider base class - used when destination is single tile / multiple trackdirs */
template <class Types>
class CYapfDestinationTileT
{
public:
typedef typename Types::Tpf Tpf;
typedef typename Types::Tpf Tpf; ///< the pathfinder class (derived from THIS class)
typedef typename Types::NodeList::Titem Node; ///< this will be our node type
typedef typename Node::Key Key; ///< key to hash tables
typedef typename Node::Key Key; ///< key to hash tables
protected:
TileIndex m_destTile;
TrackdirBits m_destTrackdirs;
TileIndex m_destTile; ///< destination tile
TrackdirBits m_destTrackdirs; ///< destination trackdir mask
public:
/// set the destination tile / more trackdirs
void SetDestination(TileIndex tile, TrackdirBits trackdirs)
{
m_destTile = tile;
@@ -106,15 +116,19 @@ public:
}
protected:
/// to access inherited path finder
Tpf& Yapf() {return *static_cast<Tpf*>(this);}
public:
/// Called by YAPF to detect if node ends in the desired destination
FORCEINLINE bool PfDetectDestination(Node& n)
{
bool bDest = (n.m_key.m_tile == m_destTile) && ((m_destTrackdirs & TrackdirToTrackdirBits(n.GetTrackdir())) != TRACKDIR_BIT_NONE);
return bDest;
}
/** Called by YAPF to calculate cost estimate. Calculates distance to the destination
* adds it to the actual cost from origin and stores the sum to the Node::m_estimate */
inline bool PfCalcEstimate(Node& n)
{
int dx = abs(TileX(n.GetTile()) - TileX(m_destTile));
@@ -128,14 +142,18 @@ public:
}
};
/** YAPF template that uses Ttypes template argument to determine all YAPF
* components (base classes) from which the actual YAPF is composed.
* For example classes consult: CYapfRail_TypesT template and its instantiations:
* CYapfRail1, CYapfRail2, CYapfRail3, CYapfAnyDepotRail1, CYapfAnyDepotRail2, CYapfAnyDepotRail3 */
template <class Ttypes>
class CYapfT
: public Ttypes::PfBase
, public Ttypes::PfCost
, public Ttypes::PfCache
, public Ttypes::PfOrigin
, public Ttypes::PfDestination
, public Ttypes::PfFollow
: public Ttypes::PfBase ///< Instance of CYapfBaseT - main YAPF loop and support base class
, public Ttypes::PfCost ///< Cost calculation provider base class
, public Ttypes::PfCache ///< Segment cost cache provider
, public Ttypes::PfOrigin ///< Origin (tile or two-tile origin)
, public Ttypes::PfDestination ///< Destination detector and distance (estimate) calculation provider
, public Ttypes::PfFollow ///< Node follower (stepping provider)
{
};