Bitboard ClearMaskBB[65];
Bitboard StepAttackBB[16][64];
-Bitboard RayBB[64][8];
Bitboard BetweenBB[64][64];
Bitboard SquaresInFrontMask[2][64];
namespace {
void init_masks();
- void init_ray_bitboards();
void init_attacks();
void init_between_bitboards();
void init_pseudo_attacks();
int bishopDeltas[4][2] = {{1,1},{-1,1},{1,-1},{-1,-1}};
init_masks();
- init_ray_bitboards();
init_attacks();
- init_between_bitboards();
init_sliding_attacks(RAttacks, RAttackIndex, RMask, RShift, RMult, rookDeltas);
init_sliding_attacks(BAttacks, BAttackIndex, BMask, BShift, BMult, bishopDeltas);
init_pseudo_attacks();
+ init_between_bitboards();
}
BitCount8Bit[b] = (uint8_t)count_1s<CNT32>(b);
}
- int remove_bit_8(int i) { return ((i & ~15) >> 1) | (i & 7); }
-
- void init_ray_bitboards() {
-
- int d[8] = {1, -1, 16, -16, 17, -17, 15, -15};
-
- for (int i = 0; i < 128; i = (i + 9) & ~8)
- for (int j = 0; j < 8; j++)
- {
- RayBB[remove_bit_8(i)][j] = EmptyBoardBB;
- for (int k = i + d[j]; (k & 0x88) == 0; k += d[j])
- set_bit(&(RayBB[remove_bit_8(i)][j]), Square(remove_bit_8(k)));
- }
- }
-
void init_attacks() {
const int step[16][8] = {
void init_between_bitboards() {
- const SquareDelta step[8] = { DELTA_E, DELTA_W, DELTA_N, DELTA_S,
- DELTA_NE, DELTA_SW, DELTA_NW, DELTA_SE };
+ Square s1, s2, s3;
+ SquareDelta d;
+ int f, r;
- for (Square s1 = SQ_A1; s1 <= SQ_H8; s1++)
- for (Square s2 = SQ_A1; s2 <= SQ_H8; s2++)
+ for (s1 = SQ_A1; s1 <= SQ_H8; s1++)
+ for (s2 = SQ_A1; s2 <= SQ_H8; s2++)
{
BetweenBB[s1][s2] = EmptyBoardBB;
- SignedDirection d = SignedDirection(SignedDirectionTable[s1][s2]);
- if (d != SIGNED_DIR_NONE)
+ if (bit_is_set(QueenPseudoAttacks[s1], s2))
{
- for (Square s3 = s1 + step[d]; s3 != s2; s3 += step[d])
+ f = file_distance(s1, s2);
+ r = rank_distance(s1, s2);
+
+ d = SquareDelta(s2 - s1) / Max(f, r);
+
+ for (s3 = s1 + d; s3 != s2; s3 += d)
set_bit(&(BetweenBB[s1][s2]), s3);
}
}