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nodchip
57 lines
1.6 KiB
C++
57 lines
1.6 KiB
C++
//Definition of input feature P of NNUE evaluation function
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#if defined(EVAL_NNUE)
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#include "p.h"
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#include "index_list.h"
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namespace Eval {
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namespace NNUE {
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namespace 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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// Find the index of the feature quantity from the king position and PieceSquare
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inline IndexType P::MakeIndex(
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Color perspective, Square s, Piece pc) {
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return IndexType(orient(perspective, s) + kpp_board_index[pc][perspective]);
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}
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// Get a list of indices with a value of 1 among the features
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void P::AppendActiveIndices(
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const Position& pos, Color perspective, IndexList* active) {
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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(MakeIndex(perspective, s, pos.piece_on(s)));
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}
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}
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// Get a list of indices whose values have changed from the previous one in the feature quantity
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void P::AppendChangedIndices(
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const Position& pos, Color perspective,
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IndexList* removed, IndexList* added) {
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const auto& dp = pos.state()->dirtyPiece;
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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(MakeIndex(perspective, dp.from[i], pc));
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if (dp.to[i] != SQ_NONE)
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added->push_back(MakeIndex(perspective, dp.to[i], pc));
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}
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}
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} // namespace Features
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} // namespace NNUE
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} // namespace Eval
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#endif // defined(EVAL_NNUE)
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