SWORD25: Importing original sources

svn-id: r53171

1 files changed, 53 insertions, 0 deletions

diff --git a/engines/sword25/gfx/framecounter.cpp b/engines/sword25/gfx/framecounter.cpp
new file mode 100755
index 0000000000..54c844967d
--- /dev/null
+++ b/engines/sword25/gfx/framecounter.cpp
@@ -0,0 +1,53 @@
+// -----------------------------------------------------------------------------
+// This file is part of Broken Sword 2.5
+// Copyright (c) Malte Thiesen, Daniel Queteschiner and Michael Elsdörfer
+//
+// 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 "framecounter.h"
+#include "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 erhöht.
+		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;
+		}
+	}
+}