mirror of
https://github.com/libretro/scummvm.git
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69 lines
2.1 KiB
C++
69 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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* 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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* 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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* $URL$
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* $Id$
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*
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*/
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/*
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* This code is based on Broken Sword 2.5 engine
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*
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* Copyright (c) Malte Thiesen, Daniel Queteschiner and Michael Elsdoerfer
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*
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* Licensed under GNU GPL v2
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*
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*/
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#include "common/system.h"
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#include "sword25/gfx/framecounter.h"
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namespace Sword25 {
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Framecounter::Framecounter(int updateFrequency) :
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_FPS(0),
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_FPSCount(0),
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_lastUpdateTime(-1) {
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setUpdateFrequency(updateFrequency);
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}
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void Framecounter::update() {
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// Aktuellen Systemtimerstand auslesen
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uint64 timer = g_system->getMillis() * 1000;
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// Falls m_LastUpdateTime == -1 ist, wird der Frame-Counter zum ersten Mal aufgerufen und der aktuelle Systemtimer als erster
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// Messzeitpunkt genommen.
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if (_lastUpdateTime == -1)
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_lastUpdateTime = timer;
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else {
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// Die Anzahl der Frames im aktuellen Messzeitraum wird erhöht.
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_FPSCount++;
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// Falls der Messzeitraum verstrichen ist, wird die durchschnittliche Framerate berechnet und ein neuer Messzeitraum begonnen.
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if (timer - _lastUpdateTime >= _updateDelay) {
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_FPS = static_cast<int>((1000000 * (uint64)_FPSCount) / (timer - _lastUpdateTime));
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_lastUpdateTime = timer;
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_FPSCount = 0;
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}
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}
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}
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} // End of namespace Sword25
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