private static void AddPawnMoves(this IPosition pos, MoveList moves, BitBoard targetSquares, Direction direction, EMoveType type, Emgf flags)
{
if (targetSquares.Empty())
{
return;
}
var stm = pos.State.SideToMove;
var piece = EPieceType.Pawn.MakePiece(stm);
var promotionRank = stm.PromotionRank();
var promotionSquares = targetSquares & promotionRank;
var nonPromotionSquares = targetSquares & ~promotionRank;
while (nonPromotionSquares)
{
var to = nonPromotionSquares.Lsb();
var from = to - direction;
pos.AddMove(moves, piece, from, to, PieceExtensions.EmptyPiece, flags, type);
BitBoards.ResetLsb(ref nonPromotionSquares);
}
type |= EMoveType.Promotion;
if (flags.HasFlagFast(Emgf.Queenpromotion))
{
var sqTo = promotionSquares.Lsb();
var sqFrom = sqTo - direction;
pos.AddMove(moves, piece, sqFrom, sqTo, EPieceType.Queen.MakePiece(stm), flags, type);
BitBoards.ResetLsb(ref promotionSquares);
}
else
{
while (promotionSquares)
{
var sqTo = promotionSquares.Lsb();
var sqFrom = sqTo - direction;
for (var promotedPiece = EPieceType.Queen; promotedPiece >= EPieceType.Knight; promotedPiece--)
{
pos.AddMove(moves, piece, sqFrom, sqTo, promotedPiece.MakePiece(stm), flags, type);
}
BitBoards.ResetLsb(ref promotionSquares);
}
}
}
private static void AddMoves(this IPosition pos, MoveList moves, Piece piece, Square from, BitBoard attacks, Emgf flags)
{
var target = pos.Pieces(~pos.State.SideToMove) & attacks;
while (target)
{
var to = target.Lsb();
pos.AddMove(moves, piece, from, to, PieceExtensions.EmptyPiece, flags, EMoveType.Capture);
BitBoards.ResetLsb(ref target);
}
target = ~pos.Pieces() & attacks;
while (target)
{
var to = target.Lsb();
pos.AddMove(moves, piece, from, to, PieceExtensions.EmptyPiece, flags);
BitBoards.ResetLsb(ref target);
}
}
private static void AddCastleMove(this IPosition pos, MoveList moves, Square from, Square to, Emgf flags) => pos.AddMove(moves, EPieceType.King.MakePiece(pos.State.SideToMove), from, to, PieceExtensions.EmptyPiece, flags, EMoveType.Castle);
