src/pieces.c

   1 /*  pieces.c
   2     28 Feb 2007 */
   3
   4 /*
   5     This file is part of Arrocco, which is Copyright 2007 Thomas Plick
   6     (tomplick 'at' gmail.com).
   7
   8     Arrocco is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation; either version 3 of the License, or
  11     (at your option) any later version.
  12
  13     Arrocco is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License
  19     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include <stdbool.h>
  23
  24 const int EMPTY = 0, PAWN = 2,   KNIGHT = 4, BISHOP = 6,
  25           ROOK = 8,  QUEEN = 10, KING = 12;
  26
  27 const int pieceValues[14] = {0, 0, 10, -10, 30, -30, 30, -30, 50, -50, 90, -90,
  28             8888, -8888};
  29
  30 #define WHITE(x) (x)
  31 #define BLACK(x) (x+1)
  32
  33 inline bool isWhite(int x){
  34     return x && ((~x) & 1);
  35 }
  36
  37 inline bool isBlack(int x){
  38     return x & 1;
  39 }
  40
  41
  42 inline int opponent(int x){
  43     return x ^ 1;
  44 }
  45
  46 int promoteTo(int pawn, int piece){
  47     return (pawn & 1) | piece;
  48 }
  49
  50 bool sameColor(int x, int y){
  51     if (x == 0 || y == 0){
  52         return false;
  53     } else {
  54         return !((x ^ y) & 1);
  55     }
  56 }
  57
  58 bool sameColorNotZero(int x, int y){
  59     return !((x ^ y) & 1);
  60 }