pieces.c

   1 /*  pieces.c
   2     28 Feb 2007 */
   3
   4 #include <stdbool.h>
   5
   6 const int EMPTY = 0, PAWN = 2,   KNIGHT = 4, BISHOP = 6,
   7           ROOK = 8,  QUEEN = 10, KING = 12;
   8
   9 const int pieceValues[14] = {0, 0, 10, -10, 30, -30, 30, -30, 50, -50, 90, -90,
  10             8888, -8888};
  11
  12 #define WHITE(x) (x)
  13 #define BLACK(x) (x+1)
  14
  15 inline bool isWhite(int x){
  16     return x && ((~x) & 1);
  17 }
  18
  19 inline bool isBlack(int x){
  20     return x & 1;
  21 }
  22
  23
  24 inline int opponent(int x){
  25     return x ^ 1;
  26 }
  27
  28 int promoteTo(int pawn, int piece){
  29     return (pawn & 1) | piece;
  30 }
  31
  32 bool sameColor(int x, int y){
  33     if (x == 0 || y == 0){
  34         return false;
  35     } else {
  36         return !((x ^ y) & 1);
  37     }
  38 }
  39
  40 bool sameColorNotZero(int x, int y){
  41     return !((x ^ y) & 1);
  42 }