src/piece.h

   1 /*
   2   Glaurung, a UCI chess playing engine.
   3   Copyright (C) 2004-2008 Tord Romstad
   4
   5   Glaurung is free software: you can redistribute it and/or modify
   6   it under the terms of the GNU General Public License as published by
   7   the Free Software Foundation, either version 3 of the License, or
   8   (at your option) any later version.
   9
  10   Glaurung is distributed in the hope that it will be useful,
  11   but WITHOUT ANY WARRANTY; without even the implied warranty of
  12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13   GNU General Public License for more details.
  14
  15   You should have received a copy of the GNU General Public License
  16   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19
  20 #if !defined(PIECE_H_INCLUDED)
  21 #define PIECE_H_INCLUDED
  22
  23 ////
  24 //// Includes
  25 ////
  26
  27 #include "color.h"
  28 #include "misc.h"
  29 #include "square.h"
  30
  31
  32 ////
  33 //// Types
  34 ////
  35
  36 enum PieceType {
  37   NO_PIECE_TYPE = 0,
  38   PAWN = 1, KNIGHT = 2, BISHOP = 3, ROOK = 4, QUEEN = 5, KING = 6
  39 };
  40
  41 enum Piece {
  42   NO_PIECE = 0, WP = 1, WN = 2, WB = 3, WR = 4, WQ = 5, WK = 6,
  43   BP = 9, BN = 10, BB = 11, BR = 12, BQ = 13, BK = 14,
  44   EMPTY = 16, OUTSIDE = 17
  45 };
  46
  47
  48 ////
  49 //// Constants and variables
  50 ////
  51
  52 const PieceType PieceTypeMin = PAWN;
  53 const PieceType PieceTypeMax = KING;
  54
  55 extern const int SlidingArray[18];
  56 extern const SquareDelta Directions[16][16];
  57 extern const SquareDelta PawnPush[2];
  58
  59
  60 ////
  61 //// Inline functions
  62 ////
  63
  64 inline Piece operator+ (Piece p, int i) { return Piece(int(p) + i); }
  65 inline void operator++ (Piece &p, int) { p = Piece(int(p) + 1); }
  66 inline Piece operator- (Piece p, int i) { return Piece(int(p) - i); }
  67 inline void operator-- (Piece &p, int) { p = Piece(int(p) - 1); }
  68 inline PieceType operator+ (PieceType p, int i) {return PieceType(int(p) + i);}
  69 inline void operator++ (PieceType &p, int) { p = PieceType(int(p) + 1); }
  70 inline PieceType operator- (PieceType p, int i) {return PieceType(int(p) - i);}
  71 inline void operator-- (PieceType &p, int) { p = PieceType(int(p) - 1); }
  72
  73 inline PieceType type_of_piece(Piece p)  {
  74   return PieceType(int(p) & 7);
  75 }
  76
  77 inline Color color_of_piece(Piece p) {
  78   return Color(int(p) >> 3);
  79 }
  80
  81 inline Piece piece_of_color_and_type(Color c, PieceType pt) {
  82   return Piece((int(c) << 3) | int(pt));
  83 }
  84
  85 inline Piece pawn_of_color(Color c) {
  86   return piece_of_color_and_type(c, PAWN);
  87 }
  88
  89 inline Piece knight_of_color(Color c) {
  90   return piece_of_color_and_type(c, KNIGHT);
  91 }
  92
  93 inline Piece bishop_of_color(Color c) {
  94   return piece_of_color_and_type(c, BISHOP);
  95 }
  96
  97 inline Piece rook_of_color(Color c) {
  98   return piece_of_color_and_type(c, ROOK);
  99 }
 100
 101 inline Piece queen_of_color(Color c) {
 102   return piece_of_color_and_type(c, QUEEN);
 103 }
 104
 105 inline Piece king_of_color(Color c) {
 106   return piece_of_color_and_type(c, KING);
 107 }
 108
 109 inline int piece_is_slider(Piece p) {
 110   return SlidingArray[int(p)];
 111 }
 112
 113 inline int piece_type_is_slider(PieceType pt) {
 114   return SlidingArray[int(pt)];
 115 }
 116
 117 inline SquareDelta pawn_push(Color c) {
 118   return PawnPush[c];
 119 }
 120
 121
 122 ////
 123 //// Prototypes
 124 ////
 125
 126 extern char piece_type_to_char(PieceType pt, bool upcase);
 127 extern PieceType piece_type_from_char(char c);
 128 extern bool piece_is_ok(Piece pc);
 129 extern bool piece_type_is_ok(PieceType pt);
 130
 131
 132 #endif // !defined(PIECE_H_INCLUDED)