stellar

Populating Occupancy function

1 files changed, 20 insertions(+), 10 deletions(-)

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

@@ -244,18 +244,28 @@ void init_leapers_attacks(void) { } }

U64 set_occupancy(int index, int bits_in_mask, U64 attack_mask) {

U64 occupancy = C64(0);

for (int count = 0; count < bits_in_mask; count++) {

int square = bit_lsb_index(attack_mask);

bit_pop(attack_mask, square);

if (index & (1 << count))

bit_set(occupancy, square);

}

return occupancy;

}

int main(void) { init_leapers_attacks();

U64 block = C64(0);

bit_set(block, e4);

bit_set(block, e5);

bit_set(block, d4);

bit_set(block, d5);

bitboard_print(block);

bitboard_print((block & -block) - 1);

int cord = bit_lsb_index(block);

printf("%d: %s\n", cord, square_to_coordinates[cord]);

U64 attack_mask = mask_rook_attacks(a1);

for (int i = 0; i < 4096; i++) {

U64 occupancy = set_occupancy(i, bit_count(attack_mask), attack_mask);

bitboard_print(occupancy);

getc(stdin);

}

return 0; }