X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fpawns.h;h=3ec62334c96d28cbf68e0a4184d3c4f5da2df780;hp=c4a616c2d766de3fe7698ce3d512e72117a3747a;hb=3e4dfb49a747be902d25ae06783f98ba29fb5030;hpb=bb751d6c890f5c50c642366d601740366cfae8d0

diff --git a/src/pawns.h b/src/pawns.h
index c4a616c2..3ec62334 100644
--- a/src/pawns.h
+++ b/src/pawns.h
@@ -1,130 +1,77 @@
 /*
-  Glaurung, a UCI chess playing engine.
-  Copyright (C) 2004-2008 Tord Romstad
+  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
+  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
+  Copyright (C) 2008-2013 Marco Costalba, Joona Kiiski, Tord Romstad
 
-  Glaurung is free software: you can redistribute it and/or modify
+  Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
-  
-  Glaurung is distributed in the hope that it will be useful,
+
+  Stockfish is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
-  
+
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(PAWNS_H_INCLUDED)
 #define PAWNS_H_INCLUDED
 
-////
-//// Includes
-////
-
+#include "misc.h"
 #include "position.h"
+#include "types.h"
 
+namespace Pawns {
 
-////
-//// Types
-////
-
-/// PawnInfo is a class which contains various information about a pawn 
-/// structure.  Currently, it only includes a middle game and an end game
-/// pawn structure evaluation, and a bitboard of passed pawns.  We may want
-/// to add further information in the future.  A lookup to the pawn hash table
-/// (performed by calling the get_pawn_info method in a PawnInfoTable object)
-/// returns a pointer to a PawnInfo object.
-
-class PawnInfo {
-
-  friend class PawnInfoTable;
+/// Pawns::Entry contains various information about a pawn structure. Currently,
+/// it only includes a middle game and end game pawn structure evaluation, and a
+/// bitboard of passed pawns. We may want to add further information in the future.
+/// A lookup to the pawn hash table (performed by calling the probe function)
+/// returns a pointer to an Entry object.
 
-public:
-  Value mg_value() const;
-  Value eg_value() const;
-  Value kingside_storm_value(Color c) const;
-  Value queenside_storm_value(Color c) const;
-  Bitboard passed_pawns() const;
-  bool file_is_half_open(Color c, File f) const;
-  bool has_open_file_to_left(Color c, File f) const;
-  bool has_open_file_to_right(Color c, File f) const;
+struct Entry {
 
-private:
-  void clear();
+  Score pawns_value() const { return value; }
+  Bitboard pawn_attacks(Color c) const { return pawnAttacks[c]; }
+  Bitboard passed_pawns(Color c) const { return passedPawns[c]; }
+  int file_is_half_open(Color c, File f) const { return halfOpenFiles[c] & (1 << int(f)); }
+  int has_open_file_to_left(Color c, File f) const { return halfOpenFiles[c] & ((1 << int(f)) - 1); }
+  int has_open_file_to_right(Color c, File f) const { return halfOpenFiles[c] & ~((1 << int(f+1)) - 1); }
+  int same_colored_pawn_count(Square s, Color c) const { return (BlackSquares & s) ? pawnsOnBlackSquaresCount[c] : pawnsOnWhiteSquaresCount[c]; } 
 
-  Key key;
-  Bitboard passedPawns;
-  int16_t mgValue, egValue;
-  int8_t ksStormValue[2], qsStormValue[2];
-  uint8_t halfOpenFiles[2];
-};
+  template<Color Us>
+  Score king_safety(const Position& pos, Square ksq)  {
 
+    return kingSquares[Us] == ksq && castleRights[Us] == pos.can_castle(Us)
+         ? kingSafety[Us] : update_safety<Us>(pos, ksq);
+  }
 
-/// The PawnInfoTable class represents a pawn hash table.  It is basically
-/// just an array of PawnInfo objects and a few methods for accessing these
-/// objects.  The most important method is get_pawn_info, which looks up a
-/// position in the table and returns a pointer to a PawnInfo object.
+  template<Color Us>
+  Score update_safety(const Position& pos, Square ksq);
 
-class PawnInfoTable {
+  template<Color Us>
+  Value shelter_storm(const Position& pos, Square ksq);
 
-public:
-  PawnInfoTable(unsigned numOfEntries);
-  ~PawnInfoTable();
-  void clear();
-  PawnInfo *get_pawn_info(const Position &pos);
-
-private:
-  unsigned size;
-  PawnInfo *entries;
+  Key key;
+  Bitboard passedPawns[COLOR_NB];
+  Bitboard pawnAttacks[COLOR_NB];
+  Square kingSquares[COLOR_NB];
+  int minKPdistance[COLOR_NB];
+  int castleRights[COLOR_NB];
+  Score value;
+  int halfOpenFiles[COLOR_NB];
+  Score kingSafety[COLOR_NB];
+  int pawnsOnWhiteSquaresCount[COLOR_NB];
+  int pawnsOnBlackSquaresCount[COLOR_NB];
 };
 
+typedef HashTable<Entry, 16384> Table;
 
-////
-//// Inline functions
-////
-
-inline Value PawnInfo::mg_value() const {
-  return Value(mgValue);
-}
-
-inline Value PawnInfo::eg_value() const {
-  return Value(egValue);
-}
-
-inline Bitboard PawnInfo::passed_pawns() const {
-  return passedPawns;
-}
-
-inline Value PawnInfo::kingside_storm_value(Color c) const {
-  return Value(ksStormValue[c]);
-}
-
-inline Value PawnInfo::queenside_storm_value(Color c) const {
-  return Value(qsStormValue[c]);
-}
-
-inline bool PawnInfo::file_is_half_open(Color c, File f) const {
-  return (halfOpenFiles[c] & (1 << int(f)));
-}
-
-inline bool PawnInfo::has_open_file_to_left(Color c, File f) const {
-  return halfOpenFiles[c] & ((1 << int(f)) - 1);
-}
+Entry* probe(const Position& pos, Table& entries);
 
-inline bool PawnInfo::has_open_file_to_right(Color c, File f) const {
-  return halfOpenFiles[c] & ~((1 << int(f+1)) - 1);
 }
 
-inline void PawnInfo::clear() {
-  mgValue = egValue = 0;
-  passedPawns = EmptyBoardBB;
-  ksStormValue[WHITE] = ksStormValue[BLACK] = 0;
-  qsStormValue[WHITE] = qsStormValue[BLACK] = 0;
-  halfOpenFiles[WHITE] = halfOpenFiles[BLACK] = 0xFF;
-}
-
-
 #endif // !defined(PAWNS_H_INCLUDED)