1 /* 2 Minetest 3 Copyright (C) 2015 Nerzhul, Loic Blot <loic.blot@unix-experience.fr> 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU Lesser General Public License as published by 7 the Free Software Foundation; either version 2.1 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public License along 16 with this program; if not, write to the Free Software Foundation, Inc., 17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 18 */ 19 20 #pragma once 21 22 #include "irr_v3d.h" 23 24 #include <map> 25 #include <vector> 26 #include <unordered_map> 27 #include <mutex> 28 29 /* 30 * This class permits caching getFacePosition call results. 31 * This reduces CPU usage and vector calls. 32 */ 33 class FacePositionCache { 34 public: 35 static const std::vector<v3s16> &getFacePositions(u16 d); 36 37 private: 38 static const std::vector<v3s16> &generateFacePosition(u16 d); 39 static std::unordered_map<u16, std::vector<v3s16>> cache; 40 static std::mutex cache_mutex; 41 }; 42