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// -----------------------------------------------------------------------------
// This file is part of Broken Sword 2.5
// Copyright (c) Malte Thiesen, Daniel Queteschiner and Michael Elsd�rfer
//
// Broken Sword 2.5 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.
//
// Broken Sword 2.5 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 Broken Sword 2.5; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
// -----------------------------------------------------------------------------
#include "sword25/gfx/framecounter.h"
#include "sword25/kernel/timer.h"
BS_Framecounter::BS_Framecounter(int UpdateFrequency) :
m_FPS(0),
m_FPSCount(0),
m_LastUpdateTime(-1)
{
SetUpdateFrequency(UpdateFrequency);
}
void BS_Framecounter::Update()
{
// Aktuellen Systemtimerstand auslesen
uint64_t Timer = BS_Timer::GetMicroTicks();
// 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;
}
}
}
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