mirror of
https://github.com/sockspls/badfish
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140 lines
3.9 KiB
C++
140 lines
3.9 KiB
C++
/*
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Stockfish, a UCI chess playing engine derived from Glaurung 2.1
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Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
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Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
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Stockfish is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Stockfish is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#if !defined(PAWNS_H_INCLUDED)
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#define PAWNS_H_INCLUDED
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////
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//// Includes
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////
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#include "bitboard.h"
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#include "value.h"
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////
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//// Types
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////
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/// PawnInfo is a class which contains various information about a pawn
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/// structure. Currently, it only includes a middle game and an end game
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/// pawn structure evaluation, and a bitboard of passed pawns. We may want
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/// to add further information in the future. A lookup to the pawn hash table
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/// (performed by calling the get_pawn_info method in a PawnInfoTable object)
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/// returns a pointer to a PawnInfo object.
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class Position;
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class PawnInfo {
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friend class PawnInfoTable;
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public:
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PawnInfo() { clear(); }
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Score pawns_value() const;
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Value kingside_storm_value(Color c) const;
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Value queenside_storm_value(Color c) const;
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Bitboard pawn_attacks(Color c) const;
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Bitboard passed_pawns() const;
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int file_is_half_open(Color c, File f) const;
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int has_open_file_to_left(Color c, File f) const;
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int has_open_file_to_right(Color c, File f) const;
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int get_king_shelter(const Position& pos, Color c, Square ksq);
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private:
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void clear();
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int updateShelter(const Position& pos, Color c, Square ksq);
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Key key;
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Bitboard passedPawns;
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Bitboard pawnAttacks[2];
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Square kingSquares[2];
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Score value;
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int16_t ksStormValue[2], qsStormValue[2];
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uint8_t halfOpenFiles[2];
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uint8_t kingShelters[2];
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};
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/// The PawnInfoTable class represents a pawn hash table. It is basically
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/// just an array of PawnInfo objects and a few methods for accessing these
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/// objects. The most important method is get_pawn_info, which looks up a
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/// position in the table and returns a pointer to a PawnInfo object.
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class PawnInfoTable {
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enum SideType { KingSide, QueenSide };
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public:
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PawnInfoTable(unsigned numOfEntries);
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~PawnInfoTable();
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PawnInfo* get_pawn_info(const Position& pos) const;
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private:
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template<Color Us>
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Score evaluate_pawns(const Position& pos, Bitboard ourPawns, Bitboard theirPawns, PawnInfo* pi) const;
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template<Color Us, SideType Side>
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int evaluate_pawn_storm(Square s, Rank r, File f, Bitboard theirPawns) const;
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unsigned size;
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PawnInfo* entries;
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};
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////
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//// Inline functions
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////
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inline Score PawnInfo::pawns_value() const {
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return value;
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}
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inline Bitboard PawnInfo::passed_pawns() const {
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return passedPawns;
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}
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inline Bitboard PawnInfo::pawn_attacks(Color c) const {
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return pawnAttacks[c];
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}
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inline Value PawnInfo::kingside_storm_value(Color c) const {
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return Value(ksStormValue[c]);
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}
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inline Value PawnInfo::queenside_storm_value(Color c) const {
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return Value(qsStormValue[c]);
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}
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inline int PawnInfo::file_is_half_open(Color c, File f) const {
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return (halfOpenFiles[c] & (1 << int(f)));
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}
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inline int PawnInfo::has_open_file_to_left(Color c, File f) const {
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return halfOpenFiles[c] & ((1 << int(f)) - 1);
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}
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inline int PawnInfo::has_open_file_to_right(Color c, File f) const {
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return halfOpenFiles[c] & ~((1 << int(f+1)) - 1);
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}
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inline int PawnInfo::get_king_shelter(const Position& pos, Color c, Square ksq) {
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return (kingSquares[c] == ksq ? kingShelters[c] : updateShelter(pos, c, ksq));
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}
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#endif // !defined(PAWNS_H_INCLUDED)
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