+++ /dev/null
-/*
- Stockfish, a UCI chess playing engine derived from Glaurung 2.1
- Copyright (C) 2004-2021 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 HalfKP of NNUE evaluation function
-
-#include "half_kp.h"
-
-#include "../../position.h"
-
-namespace Stockfish::Eval::NNUE::Features {
-
- // Orient a square according to perspective (rotates by 180 for black)
- inline Square HalfKP::orient(Color perspective, Square s) {
- return Square(int(s) ^ (bool(perspective) * 63));
- }
-
- // Index of a feature for a given king position and another piece on some square
- inline IndexType HalfKP::make_index(Color perspective, Square s, Piece pc, Square ksq) {
- return IndexType(orient(perspective, s) + PieceSquareIndex[perspective][pc] + PS_NB * ksq);
- }
-
- // Get a list of indices for active features
- void HalfKP::append_active_indices(
- const Position& pos,
- Color perspective,
- ValueListInserter<IndexType> active
- ) {
- Square ksq = orient(perspective, pos.square<KING>(perspective));
- Bitboard bb = pos.pieces() & ~pos.pieces(KING);
- while (bb)
- {
- Square s = pop_lsb(bb);
- active.push_back(make_index(perspective, s, pos.piece_on(s), ksq));
- }
- }
-
-
- // append_changed_indices() : get a list of indices for recently changed features
-
- void HalfKP::append_changed_indices(
- Square ksq,
- StateInfo* st,
- Color perspective,
- ValueListInserter<IndexType> removed,
- ValueListInserter<IndexType> added
- ) {
- const auto& dp = st->dirtyPiece;
- Square oriented_ksq = orient(perspective, ksq);
- for (int i = 0; i < dp.dirty_num; ++i) {
- Piece pc = dp.piece[i];
- if (type_of(pc) == KING) continue;
- if (dp.from[i] != SQ_NONE)
- removed.push_back(make_index(perspective, dp.from[i], pc, oriented_ksq));
- if (dp.to[i] != SQ_NONE)
- added.push_back(make_index(perspective, dp.to[i], pc, oriented_ksq));
- }
- }
-
- int HalfKP::update_cost(StateInfo* st) {
- return st->dirtyPiece.dirty_num;
- }
-
- int HalfKP::refresh_cost(const Position& pos) {
- return pos.count<ALL_PIECES>() - 2;
- }
-
- bool HalfKP::requires_refresh(StateInfo* st, Color perspective) {
- return st->dirtyPiece.piece[0] == make_piece(perspective, KING);
- }
-
-} // namespace Stockfish::Eval::NNUE::Features