1 /* ResidualVM - A 3D game interpreter 2 * 3 * ResidualVM is the legal property of its developers, whose names 4 * are too numerous to list here. Please refer to the AUTHORS 5 * file distributed with this source distribution. 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 2 10 * of the License, or (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 20 * 21 */ 22 23 #ifndef STARK_GFX_FRAMELIMITER_H 24 #define STARK_GFX_FRAMELIMITER_H 25 26 #include "common/system.h" 27 28 namespace Stark { 29 30 namespace Gfx { 31 32 /** 33 * A framerate limiter 34 * 35 * Ensures the framerate does not exceed the specified value 36 * by delaying until all of the timeslot allocated to the frame 37 * is consumed. 38 * Allows to curb CPU usage and have a stable framerate. 39 */ 40 class FrameLimiter { 41 public: 42 FrameLimiter(OSystem *system, const uint framerate); 43 44 void startFrame(); 45 void delayBeforeSwap(); 46 47 void pause(bool pause); 48 49 uint getLastFrameDuration() const; 50 private: 51 OSystem *_system; 52 53 bool _enabled; 54 uint _speedLimitMs; 55 uint _startFrameTime; 56 uint _lastFrameDurationMs; 57 }; 58 59 } // End of namespace Gfx 60 } // End of namespace Stark 61 62 #endif // STARK_GFX_FRAMELIMITER_H 63