// Takes ownership of all arrays passed to it; they should not be changed after the position is created.
public Position(Piece[] pieceSquares, Color sideToMove, ulong castlingRights, ulong enPassant, int fiftyMoveCounter, int fullMove)
{
_pieceBitboards = new BitboardArray();
_squares = new PieceSquareArray();
// safer to go by the length the PieceSquareArray, because the Piece[] will always error on index out of bounds
for (int i = 0; i < _squares.Length; i++)
{
_squares[i] = pieceSquares[i];
}
PopulatePieceBitboardsFromSquares(ref _pieceBitboards, pieceSquares);
_occupiedWhite = CalculateOccupied(Color.White);
_occupiedBlack = CalculateOccupied(Color.Black);
_occupied = _occupiedWhite | _occupiedBlack;
Parent = null;
SideToMove = sideToMove;
CastlingRights = castlingRights;
EnPassant = enPassant;
FiftyMoveCounter = fiftyMoveCounter;
GamePly = GamePlyFromFullMove(fullMove, sideToMove);
_historyPly = 0;
RepetitionNumber = 1;
ZobristHash = ZobristHashing.CalculateFullHash(this);
}
private static void PopulatePieceBitboardsFromSquares(ref BitboardArray pieceBitboards, Piece[] squares)
{
for (int i = 0; i < pieceBitboards.Length; i++)
{
pieceBitboards[i] = 0;
}
for (int ix = 0; ix < 64; ix++)
{
var piece = squares[ix];
if (piece.PieceType == PieceType.None)
{
continue;
}
var value = ValueFromIx(ix);
pieceBitboards[PieceBitboardIndex(piece.Color, piece.PieceType)] |= value;
}
}
public Position()
{
_pieceBitboards = new BitboardArray();
_squares = new PieceSquareArray();
}
// would need to copy the contents if this were an array
private void CopyPieceBitboards(ref BitboardArray ret)
{
ret = _pieceBitboards;
}
