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dc7e9f2 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 | /*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2026 The Stockfish developers (see AUTHORS file)
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Stockfish is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
//Definition of input features HalfKAv2_hm of NNUE evaluation function
#include "half_ka_v2_hm.h"
#include "../../bitboard.h"
#include "../../position.h"
#include "../../types.h"
#include "../nnue_common.h"
namespace Stockfish::Eval::NNUE::Features {
// Index of a feature for a given king position and another piece on some square
IndexType HalfKAv2_hm::make_index(Color perspective, Square s, Piece pc, Square ksq) {
const IndexType flip = 56 * perspective;
return (IndexType(s) ^ OrientTBL[ksq] ^ flip) + PieceSquareIndex[perspective][pc]
+ KingBuckets[int(ksq) ^ flip];
}
// Get a list of indices for active features
void HalfKAv2_hm::append_active_indices(Color perspective, const Position& pos, IndexList& active) {
Square ksq = pos.square<KING>(perspective);
Bitboard bb = pos.pieces();
while (bb)
{
Square s = pop_lsb(bb);
active.push_back(make_index(perspective, s, pos.piece_on(s), ksq));
}
}
// Get a list of indices for recently changed features
void HalfKAv2_hm::append_changed_indices(
Color perspective, Square ksq, const DiffType& diff, IndexList& removed, IndexList& added) {
removed.push_back(make_index(perspective, diff.from, diff.pc, ksq));
if (diff.to != SQ_NONE)
added.push_back(make_index(perspective, diff.to, diff.pc, ksq));
if (diff.remove_sq != SQ_NONE)
removed.push_back(make_index(perspective, diff.remove_sq, diff.remove_pc, ksq));
if (diff.add_sq != SQ_NONE)
added.push_back(make_index(perspective, diff.add_sq, diff.add_pc, ksq));
}
bool HalfKAv2_hm::requires_refresh(const DiffType& diff, Color perspective) {
return diff.pc == make_piece(perspective, KING);
}
} // namespace Stockfish::Eval::NNUE::Features
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