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piece.h
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piece.h
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/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
Copyright (C) 2008 Marco Costalba
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.
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(PIECE_H_INCLUDED)
#define PIECE_H_INCLUDED
////
//// Includes
////
#include "color.h"
#include "misc.h"
#include "square.h"
////
//// Types
////
enum PieceType {
NO_PIECE_TYPE = 0,
PAWN = 1, KNIGHT = 2, BISHOP = 3, ROOK = 4, QUEEN = 5, KING = 6
};
enum Piece {
NO_PIECE = 0, WP = 1, WN = 2, WB = 3, WR = 4, WQ = 5, WK = 6,
BP = 9, BN = 10, BB = 11, BR = 12, BQ = 13, BK = 14,
EMPTY = 16, OUTSIDE = 17
};
////
//// Constants
////
const PieceType PieceTypeMin = PAWN;
const PieceType PieceTypeMax = KING;
const int SlidingArray[18] = {
0, 0, 0, 1, 2, 3, 0, 0, 0, 0, 0, 1, 2, 3, 0, 0, 0, 0
};
const SquareDelta Directions[16][16] = {
{DELTA_ZERO},
{DELTA_NW, DELTA_NE, DELTA_ZERO},
{DELTA_SSW, DELTA_SSE, DELTA_SWW, DELTA_SEE,
DELTA_NWW, DELTA_NEE, DELTA_NNW, DELTA_NNE, DELTA_ZERO},
{DELTA_SE, DELTA_SW, DELTA_NE, DELTA_NW, DELTA_ZERO},
{DELTA_S, DELTA_E, DELTA_W, DELTA_N, DELTA_ZERO},
{DELTA_S, DELTA_E, DELTA_W, DELTA_N,
DELTA_SE, DELTA_SW, DELTA_NE, DELTA_NW, DELTA_ZERO},
{DELTA_S, DELTA_E, DELTA_W, DELTA_N,
DELTA_SE, DELTA_SW, DELTA_NE, DELTA_NW, DELTA_ZERO},
{DELTA_ZERO},
{DELTA_ZERO},
{DELTA_SW, DELTA_SE, DELTA_ZERO},
{DELTA_SSW, DELTA_SSE, DELTA_SWW, DELTA_SEE,
DELTA_NWW, DELTA_NEE, DELTA_NNW, DELTA_NNE, DELTA_ZERO},
{DELTA_SE, DELTA_SW, DELTA_NE, DELTA_NW, DELTA_ZERO},
{DELTA_S, DELTA_E, DELTA_W, DELTA_N, DELTA_ZERO},
{DELTA_S, DELTA_E, DELTA_W, DELTA_N,
DELTA_SE, DELTA_SW, DELTA_NE, DELTA_NW, DELTA_ZERO},
{DELTA_S, DELTA_E, DELTA_W, DELTA_N,
DELTA_SE, DELTA_SW, DELTA_NE, DELTA_NW, DELTA_ZERO},
};
const SquareDelta PawnPush[2] = {
DELTA_N, DELTA_S
};
////
//// Inline functions
////
inline Piece operator+ (Piece p, int i) { return Piece(int(p) + i); }
inline void operator++ (Piece &p, int) { p = Piece(int(p) + 1); }
inline Piece operator- (Piece p, int i) { return Piece(int(p) - i); }
inline void operator-- (Piece &p, int) { p = Piece(int(p) - 1); }
inline PieceType operator+ (PieceType p, int i) {return PieceType(int(p) + i);}
inline void operator++ (PieceType &p, int) { p = PieceType(int(p) + 1); }
inline PieceType operator- (PieceType p, int i) {return PieceType(int(p) - i);}
inline void operator-- (PieceType &p, int) { p = PieceType(int(p) - 1); }
inline PieceType type_of_piece(Piece p) {
return PieceType(int(p) & 7);
}
inline Color color_of_piece(Piece p) {
return Color(int(p) >> 3);
}
inline Piece piece_of_color_and_type(Color c, PieceType pt) {
return Piece((int(c) << 3) | int(pt));
}
inline int piece_is_slider(Piece p) {
return SlidingArray[int(p)];
}
inline int piece_type_is_slider(PieceType pt) {
return SlidingArray[int(pt)];
}
inline SquareDelta pawn_push(Color c) {
return PawnPush[c];
}
inline bool piece_type_is_ok(PieceType pc) {
return pc >= PAWN && pc <= KING;
}
inline bool piece_is_ok(Piece pc) {
return piece_type_is_ok(type_of_piece(pc)) && color_is_ok(color_of_piece(pc));
}
////
//// Prototypes
////
extern int piece_type_to_char(PieceType pt, bool upcase = false);
extern PieceType piece_type_from_char(char c);
#endif // !defined(PIECE_H_INCLUDED)