84 lines
2.8 KiB
C++
84 lines
2.8 KiB
C++
/*
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Stockfish, a UCI chess playing engine derived from Glaurung 2.1
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Copyright (C) 2004-2021 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 "../../position.h"
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namespace Stockfish::Eval::NNUE::Features {
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// Orient a square according to perspective (rotates by 180 for black)
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inline Square HalfKAv2_hm::orient(Color perspective, Square s, Square ksq) {
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return Square(int(s) ^ (bool(perspective) * SQ_A8) ^ ((file_of(ksq) < FILE_E) * SQ_H1));
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}
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// Index of a feature for a given king position and another piece on some square
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inline IndexType HalfKAv2_hm::make_index(Color perspective, Square s, Piece pc, Square ksq) {
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Square o_ksq = orient(perspective, ksq, ksq);
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return IndexType(orient(perspective, s, ksq) + PieceSquareIndex[perspective][pc] + PS_NB * KingBuckets[o_ksq]);
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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(
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const Position& pos,
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Color perspective,
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IndexList& active
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) {
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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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// append_changed_indices() : get a list of indices for recently changed features
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void HalfKAv2_hm::append_changed_indices(
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Square ksq,
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const DirtyPiece& dp,
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Color perspective,
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IndexList& removed,
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IndexList& added
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) {
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for (int i = 0; i < dp.dirty_num; ++i) {
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if (dp.from[i] != SQ_NONE)
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removed.push_back(make_index(perspective, dp.from[i], dp.piece[i], ksq));
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if (dp.to[i] != SQ_NONE)
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added.push_back(make_index(perspective, dp.to[i], dp.piece[i], ksq));
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}
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}
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int HalfKAv2_hm::update_cost(const StateInfo* st) {
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return st->dirtyPiece.dirty_num;
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}
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int HalfKAv2_hm::refresh_cost(const Position& pos) {
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return pos.count<ALL_PIECES>();
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}
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bool HalfKAv2_hm::requires_refresh(const StateInfo* st, Color perspective) {
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return st->dirtyPiece.piece[0] == make_piece(perspective, KING);
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}
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} // namespace Stockfish::Eval::NNUE::Features
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