1 /* B.Shapr 2 * Beat / envelope shaper LV2 plugin 3 * 4 * Copyright (C) 2019 by Sven Jähnichen 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 3, or (at your option) 9 * any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software Foundation, 18 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 19 */ 20 21 #ifndef SNAPSHOTS_HPP_ 22 #define SNAPSHOTS_HPP_ 23 24 #include <cstddef> 25 #include <array> 26 #include <iostream> 27 28 template <class T, size_t sz> 29 class Snapshots 30 { 31 protected: 32 std::array<T, sz> store; 33 size_t pos = 0; 34 size_t horizon = 0; 35 size_t size = 0; 36 37 public: clear()38 void clear () 39 { 40 store.fill (T()); 41 pos = 0; 42 horizon = 0; 43 size = 0; 44 } push(T & value)45 void push (T& value) 46 { 47 horizon = ((pos + 1) % sz); 48 store[horizon] = value; 49 pos = horizon; 50 size = (size < sz ? size + 1 : sz); 51 } 52 undo()53 T undo () 54 { 55 pos = (size == 0 ? 0 : (((size < sz) && (pos == 0)) ? 0 : ((horizon == ((pos + sz - 1) % sz)) ? pos : ((pos + sz - 1) % sz)))); 56 return store[pos]; 57 } 58 redo()59 T redo () 60 { 61 pos = (size == 0 ? 0 : ((horizon == pos) ? pos : ((pos + 1) % sz))); 62 return store[pos]; 63 } 64 }; 65 66 67 #endif /* SNAPSHOTS_HPP_ */ 68