/*
* East Sout SoEa SoWe
* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
* . . . R 1 1 1 1 . . . R . . . . . . . B . . . . . . . B . . . .
* . . . . . . . . . . . 1 . . . . . . . . 1 . . . . . 1 . . . . .
* . . . . . . . . . . . 1 . . . . . . . . . 1 . . . 1 . . . . . .
* . . . . . . . . . . . 1 . . . . . . . . . . 1 . 1 . . . . . . .
*/
private static UInt64 getPositiveRayAttacks(UInt64 occupied, int rayDir, byte square)
{
UInt64 attacks = rayAttacks[rayDir, square];
UInt64 blocker = attacks & occupied;
if (blocker != 0UL)
{
square = BitOps.bitScanForward(blocker);
attacks ^= rayAttacks[rayDir, square];
}
return(attacks);
}
internal static UInt64 GetAllTargets(UInt64 king, bool pieceColor, Board board)
{
UInt64 kingMoves = KingAttacks[(BitOps.bitScanForward(king))];
//Cannot castle if already castled or is in check
UInt64 empty;
if (pieceColor && !board.playerHasCastled && !board.isCheck)
{
empty = board.GetEmptySquares();
//Right castle
if (BitOps.IsBitSet(empty, 61) && BitOps.IsBitSet(empty, 62) && BitOps.IsBitSet(board.WR, 63))
{
kingMoves |= (1UL << 62);
}
//Left castle
else if (BitOps.IsBitSet(empty, 59) && BitOps.IsBitSet(empty, 58) && BitOps.IsBitSet(empty, 57) && BitOps.IsBitSet(board.WR, 56))
{
kingMoves |= (1UL << 58);
}
}
else if (!pieceColor && !board.computerHasCastled && !board.isCheck)
{
empty = board.GetEmptySquares();
//Right castle
if (BitOps.IsBitSet(empty, 5) && BitOps.IsBitSet(empty, 6) && BitOps.IsBitSet(board.BR, 7))
{
kingMoves |= (1UL << 6);
}
//Left castle
else if (BitOps.IsBitSet(empty, 3) && BitOps.IsBitSet(empty, 2) && BitOps.IsBitSet(empty, 1) && BitOps.IsBitSet(board.BR, 0))
{
kingMoves |= (1UL << 2);
}
}
return(kingMoves & ~board.GetColorPieces(pieceColor));
}
