mirror of
https://github.com/libretro/scummvm.git
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89 lines
2.1 KiB
C++
89 lines
2.1 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "common/system.h"
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#include "sludge/timing.h"
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namespace Sludge {
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Timer::Timer(){
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reset();
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}
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void Timer::reset(void) {
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_desiredFPS = 300;
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_startTime = 0;
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_endTime = 0;
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_desiredFrameTime = 0;
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_addNextTime = 0;
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// FPS stats
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_lastFPS = -1;
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_thisFPS = -1;
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_lastSeconds = 0;
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}
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void Timer::init(void) {
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_desiredFrameTime = 1000 / _desiredFPS;
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_startTime = g_system->getMillis();
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}
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void Timer::initSpecial(int t) {
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_desiredFrameTime = 1000 / t;
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_startTime = g_system->getMillis();
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}
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void Timer::updateFpsStats() {
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uint32 currentSeconds = g_system->getMillis() / 1000;
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if (_lastSeconds != currentSeconds) {
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_lastSeconds = currentSeconds;
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_lastFPS = _thisFPS;
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_thisFPS = 1;
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} else {
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++_thisFPS;
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}
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}
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void Timer::waitFrame(void) {
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uint32 timetaken;
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for (;;) {
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_endTime = g_system->getMillis();
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timetaken = _addNextTime + _endTime - _startTime;
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if (timetaken >= _desiredFrameTime)
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break;
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g_system->delayMillis(1);
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}
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_addNextTime = timetaken - _desiredFrameTime;
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if (_addNextTime > _desiredFrameTime)
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_addNextTime = _desiredFrameTime;
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_startTime = _endTime;
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// Stats
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updateFpsStats();
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}
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} // End of namespace Sludge
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