OPENGL: Merged from trunk, from rev 52105 to 53396.

This includes an rather hacky attempt to merge all the recent gp2x backend
changes into the branch. I suppose the gp2x backend and probably all new
backends, i.e. gph, dingux etc., might not compile anymore.

Since I have no way of testing those it would be nice if porters could look
into getting those up to speed in this branch.

svn-id: r53399

1 files changed, 68 insertions, 0 deletions

diff --git a/engines/sword25/gfx/framecounter.cpp b/engines/sword25/gfx/framecounter.cpp
new file mode 100644
index 0000000000..15bc7d00ea
--- /dev/null
+++ b/engines/sword25/gfx/framecounter.cpp
@@ -0,0 +1,68 @@
+/* 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 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;
+		}
+	}
+}
+
+} // End of namespace Sword25