src/face_position_cache.h

   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 };