stellar

King attack mask

1 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/ src/engine.c b/ src/engine.c

@@ -122,6 +122,9 @@ U64 pawn_attacks[2][64]; // knight attack table [square] U64 knight_attacks[64];

// king attack table [square]

U64 king_attacks[64];

// generate pawn attack U64 mask_pawn_attacks(int side, int square) { U64 bitboard = C64(0), attacks;

@@ -149,11 +152,25 @@ U64 mask_knight_attacks(int square) { return attacks; }

U64 mask_king_attacks(int square) {

U64 bitboard = C64(0), attacks = C64(0);

bit_set(bitboard, square);

attacks |= westOne(bitboard) | eastOne(bitboard);

attacks |= soutOne(bitboard) | nortOne(bitboard);

attacks |= soutOne(bitboard) | nortOne(bitboard);

attacks |= soEaOne(bitboard) | noEaOne(bitboard);

attacks |= soWeOne(bitboard) | noWeOne(bitboard);

return attacks;

}

void init_leapers_attacks(void) { for (int square = 0; square < 64; square++) { pawn_attacks[WHITE][square] = mask_pawn_attacks(WHITE, square); pawn_attacks[BLACK][square] = mask_pawn_attacks(BLACK, square); knight_attacks[square] = mask_knight_attacks(square);

king_attacks[square] = mask_king_attacks(square);

} }