mirror of
https://github.com/official-stockfish/Stockfish.git
synced 2026-07-22 12:47:08 +00:00
Joost VandeVondele
28844fc697
Happy New Year! closes https://github.com/official-stockfish/Stockfish/pull/6514 No functional change
70 lines
2.5 KiB
C++
70 lines
2.5 KiB
C++
/*
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Stockfish, a UCI chess playing engine derived from Glaurung 2.1
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Copyright (C) 2004-2026 The Stockfish developers (see AUTHORS file)
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Stockfish is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Stockfish is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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//Definition of input features HalfKAv2_hm of NNUE evaluation function
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#include "half_ka_v2_hm.h"
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#include "../../bitboard.h"
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#include "../../position.h"
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#include "../../types.h"
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#include "../nnue_common.h"
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namespace Stockfish::Eval::NNUE::Features {
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// Index of a feature for a given king position and another piece on some square
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IndexType HalfKAv2_hm::make_index(Color perspective, Square s, Piece pc, Square ksq) {
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const IndexType flip = 56 * perspective;
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return (IndexType(s) ^ OrientTBL[ksq] ^ flip) + PieceSquareIndex[perspective][pc]
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+ KingBuckets[int(ksq) ^ flip];
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}
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// Get a list of indices for active features
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void HalfKAv2_hm::append_active_indices(Color perspective, const Position& pos, IndexList& active) {
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Square ksq = pos.square<KING>(perspective);
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Bitboard bb = pos.pieces();
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while (bb)
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{
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Square s = pop_lsb(bb);
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active.push_back(make_index(perspective, s, pos.piece_on(s), ksq));
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}
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}
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// Get a list of indices for recently changed features
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void HalfKAv2_hm::append_changed_indices(
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Color perspective, Square ksq, const DiffType& diff, IndexList& removed, IndexList& added) {
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removed.push_back(make_index(perspective, diff.from, diff.pc, ksq));
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if (diff.to != SQ_NONE)
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added.push_back(make_index(perspective, diff.to, diff.pc, ksq));
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if (diff.remove_sq != SQ_NONE)
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removed.push_back(make_index(perspective, diff.remove_sq, diff.remove_pc, ksq));
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if (diff.add_sq != SQ_NONE)
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added.push_back(make_index(perspective, diff.add_sq, diff.add_pc, ksq));
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}
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bool HalfKAv2_hm::requires_refresh(const DiffType& diff, Color perspective) {
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return diff.pc == make_piece(perspective, KING);
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}
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} // namespace Stockfish::Eval::NNUE::Features
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