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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
/*
* This code is based on Broken Sword 2.5 engine
*
* Copyright (c) Malte Thiesen, Daniel Queteschiner and Michael Elsdoerfer
*
* Licensed under GNU GPL v2
*
*/
#include "common/system.h"
#include "sword25/gfx/framecounter.h"
namespace Sword25 {
Framecounter::Framecounter(int UpdateFrequency) :
m_FPS(0),
m_FPSCount(0),
m_LastUpdateTime(-1) {
SetUpdateFrequency(UpdateFrequency);
}
void Framecounter::Update() {
// Aktuellen Systemtimerstand auslesen
uint64_t Timer = g_system->getMillis() * 1000;
// Falls m_LastUpdateTime == -1 ist, wird der Frame-Counter zum ersten Mal aufgerufen und der aktuelle Systemtimer als erster
// Messzeitpunkt genommen.
if (m_LastUpdateTime == -1)
m_LastUpdateTime = Timer;
else {
// Die Anzahl der Frames im aktuellen Messzeitraum wird erh�ht.
m_FPSCount++;
// Falls der Messzeitraum verstrichen ist, wird die durchschnittliche Framerate berechnet und ein neuer Messzeitraum begonnen.
if (Timer - m_LastUpdateTime >= m_UpdateDelay) {
m_FPS = static_cast<int>((1000000 * (uint64_t)m_FPSCount) / (Timer - m_LastUpdateTime));
m_LastUpdateTime = Timer;
m_FPSCount = 0;
}
}
}
} // End of namespace Sword25
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