69 lines
2.5 KiB
C++
69 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) 2004-2021 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 HalfKP of NNUE evaluation function
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#include "half_kp.h"
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#include "index_list.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 orient(Color perspective, Square s) {
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return Square(int(s) ^ (bool(perspective) * 63));
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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 make_index(Color perspective, Square s, Piece pc, Square ksq) {
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return IndexType(orient(perspective, s) + kpp_board_index[perspective][pc] + PS_END * ksq);
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}
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// Get a list of indices for active features
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template <Side AssociatedKing>
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void HalfKP<AssociatedKing>::AppendActiveIndices(
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const Position& pos, Color perspective, IndexList* active) {
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Square ksq = orient(perspective, pos.square<KING>(perspective));
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Bitboard bb = pos.pieces() & ~pos.pieces(KING);
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while (bb) {
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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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template <Side AssociatedKing>
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void HalfKP<AssociatedKing>::AppendChangedIndices(
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const Position& pos, const DirtyPiece& dp, Color perspective,
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IndexList* removed, IndexList* added) {
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Square ksq = orient(perspective, pos.square<KING>(perspective));
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for (int i = 0; i < dp.dirty_num; ++i) {
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Piece pc = dp.piece[i];
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if (type_of(pc) == KING) continue;
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if (dp.from[i] != SQ_NONE)
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removed->push_back(make_index(perspective, dp.from[i], pc, ksq));
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if (dp.to[i] != SQ_NONE)
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added->push_back(make_index(perspective, dp.to[i], pc, ksq));
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}
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}
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template class HalfKP<Side::kFriend>;
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} // namespace Stockfish::Eval::NNUE::Features
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