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Copy pathsymmetries.cc
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105 lines (93 loc) · 3.41 KB
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// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "cc/symmetries.h"
namespace minigo {
namespace symmetry {
namespace {
// Generated by SymmetryTest.ConcatTable.
// clang-format off
constexpr Symmetry kConcatTable[kNumSymmetries][kNumSymmetries] = {
{kIdentity, kRot90, kRot180, kRot270, kFlip, kFlipRot90, kFlipRot180, kFlipRot270},
{kRot90, kRot180, kRot270, kIdentity, kFlipRot270, kFlip, kFlipRot90, kFlipRot180},
{kRot180, kRot270, kIdentity, kRot90, kFlipRot180, kFlipRot270, kFlip, kFlipRot90},
{kRot270, kIdentity, kRot90, kRot180, kFlipRot90, kFlipRot180, kFlipRot270, kFlip},
{kFlip, kFlipRot90, kFlipRot180, kFlipRot270, kIdentity, kRot90, kRot180, kRot270},
{kFlipRot90, kFlipRot180, kFlipRot270, kFlip, kRot270, kIdentity, kRot90, kRot180},
{kFlipRot180, kFlipRot270, kFlip, kFlipRot90, kRot180, kRot270, kIdentity, kRot90},
{kFlipRot270, kFlip, kFlipRot90, kFlipRot180, kRot90, kRot180, kRot270, kIdentity},
};
// clang-format on
constexpr const char* const kNames[kNumSymmetries] = {
"kIdentity", "kRot90", "kRot180", "kRot270",
"kFlip", "kFlipRot90", "kFlipRot180", "kFlipRot270",
};
} // namespace
std::ostream& operator<<(std::ostream& os, Symmetry sym) {
if (sym < 0 || sym >= kNumSymmetries) {
return os << "<" << static_cast<int>(sym) << ">";
} else {
return os << kNames[sym];
}
}
const std::array<Symmetry, kNumSymmetries> kAllSymmetries = {
kIdentity, kRot90, kRot180, kRot270,
kFlip, kFlipRot90, kFlipRot180, kFlipRot270,
};
const std::array<Symmetry, kNumSymmetries> kInverseSymmetries = {
kIdentity, kRot270, kRot180, kRot90,
kFlip, kFlipRot90, kFlipRot180, kFlipRot270,
};
const std::array<std::array<Coord, kNumMoves>, kNumSymmetries> kCoords = []() {
std::array<std::array<Coord, kNumMoves>, kNumSymmetries> result;
std::array<Coord, kNumMoves> original;
for (int i = 0; i < kNumMoves; ++i) {
original[i] = i;
}
for (auto c : kAllSymmetries) {
ApplySymmetry<kN, 1>(c, original.data(), result[c].data());
result[c][Coord::kPass] = original[Coord::kPass];
}
return result;
}();
Coord ApplySymmetry(Symmetry sym, Coord c) {
if (c >= Coord::kPass) {
return c;
}
int row = c / kN;
int col = c % kN;
switch (sym) {
case kIdentity:
return c;
case kRot90:
return Coord(kN - 1 - col, row);
case kRot180:
return Coord(kN - 1 - row, kN - 1 - col);
case kRot270:
return Coord(col, kN - 1 - row);
case kFlip:
return Coord(col, row);
case kFlipRot90:
return Coord(kN - 1 - row, col);
case kFlipRot180:
return Coord(kN - 1 - col, kN - 1 - row);
case kFlipRot270:
return Coord(row, kN - 1 - col);
default:
MG_LOG(FATAL) << static_cast<int>(sym);
return Coord::kInvalid;
}
}
Symmetry Concat(Symmetry a, Symmetry b) { return kConcatTable[a][b]; }
} // namespace symmetry
} // namespace minigo