public void set(int flags) {
if (!ignoreFlags) {
if (isReversed) flags = EngUtil.reverseFlags(flags);
// castling privileges
if (!EngUtil.canCastle(flags, WHITE_KINGS_CASTLING)) theValue ^= castle_random_w[0];
if (!EngUtil.canCastle(flags, WHITE_QUEENS_CASTLING)) theValue ^= castle_random_w[1];
if (!EngUtil.canCastle(flags, BLACK_KINGS_CASTLING)) theValue ^= castle_random_b[0];
if (!EngUtil.canCastle(flags, BLACK_QUEENS_CASTLING)) theValue ^= castle_random_b[1];
boolean whiteToMove = (flags & WHITE) != 0;
// en-passant target square
int epFile = EngUtil.enPassantFile(flags);
if (epFile != 0) {
int epSquare;
if (whiteToMove) epSquare = EngUtil.square(epFile, ROW_6);
else epSquare = EngUtil.square(epFile, ROW_3);
theValue ^= enpassant_random[square64(epSquare)];
}
// color to move
if (EngUtil.allOf(flags, WHITE)) theValue ^= wtm_random[0];
else if (EngUtil.allOf(flags, BLACK)) theValue ^= wtm_random[1];
else /* this branch is used when computing hash keys for look up in the crafty book.
there is no turn color. */ ;
}
}
public void set(int square, int piece) {
/* translate jose square encoding (0..80)
to crafty square encoding (A1=0, B1=1, .. H8=63)
*/
if (isReversed) {
square = EngUtil.mirrorSquare(square);
piece = EngUtil.oppositeColor(piece);
}
square = square64(square);
switch (piece) {
case WHITE_PAWN:
theValue ^= w_pawn_random[square];
break;
case BLACK_PAWN:
theValue ^= b_pawn_random[square];
break;
case WHITE_KNIGHT:
theValue ^= w_knight_random[square];
break;
case BLACK_KNIGHT:
theValue ^= b_knight_random[square];
break;
case WHITE_BISHOP:
theValue ^= w_bishop_random[square];
break;
case BLACK_BISHOP:
theValue ^= b_bishop_random[square];
break;
case WHITE_ROOK:
theValue ^= w_rook_random[square];
break;
case BLACK_ROOK:
theValue ^= b_rook_random[square];
break;
case WHITE_QUEEN:
theValue ^= w_queen_random[square];
break;
case BLACK_QUEEN:
theValue ^= b_queen_random[square];
break;
case WHITE_KING:
theValue ^= w_king_random[square];
break;
case BLACK_KING:
theValue ^= b_king_random[square];
break;
default:
throw new IllegalArgumentException();
}
}
/* translate jose square encoding (0..80)
to crafty square encoding (A1=0, B1=1, .. H8=63)
*/
private static int square64(int jose_square) {
int file0 = EngUtil.fileOf(jose_square) - FILE_A;
int row0 = EngUtil.rowOf(jose_square) - ROW_1;
return 8 * row0 + file0;
}