Behold, Nenya, Ring of Water and repository for our media and animation related

goodies, both Java 2D and LWJGL/JME 3D. git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@1 ed5b42cb-e716-0410-a449-f6a68f950b19
2006-06-23 18:07:28 +00:00
commit c2117ee86d
570 changed files with 61913 additions and 0 deletions
@@ -0,0 +1,69 @@
+//
+// $Id: PerfTimer.java 4191 2006-06-13 22:42:20Z ray $
+//
+// Narya library - tools for developing networked games
+// Copyright (C) 2002-2004 Three Rings Design, Inc., All Rights Reserved
+// http://www.threerings.net/code/narya/
+//
+// This library is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License as published
+// by the Free Software Foundation; either version 2.1 of the License, or
+// (at your option) any later version.
+//
+// This library 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
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+package com.threerings.media.timer;
+
+import sun.misc.Perf;
+
+import com.threerings.media.Log;
+
+/**
+ * A timer that uses the performance clock exposed by Sun in JDK 1.4.2.
+ */
+public class PerfTimer implements MediaTimer
+{
+    public PerfTimer ()
+    {
+        _timer = Perf.getPerf();
+        _mfrequency = _timer.highResFrequency() / 1000;
+        _ufrequency = _timer.highResFrequency() / 1000000;
+        _startStamp = _timer.highResCounter();
+        Log.info("Using high performance timer [mfreq=" + _mfrequency +
+                 ", ufreq=" + _ufrequency + ", start=" + _startStamp + "].");
+    }
+
+    // documentation inherited from interface
+    public void reset ()
+    {
+        _startStamp = _timer.highResCounter();
+    }
+
+    // documentation inherited from interface
+    public long getElapsedMillis ()
+    {
+        return (_timer.highResCounter() - _startStamp) / _mfrequency;
+    }
+
+    // documentation inherited from interface
+    public long getElapsedMicros ()
+    {
+        return (_timer.highResCounter() - _startStamp) / _ufrequency;
+    }
+
+    /** A performance timer object. */
+    protected Perf _timer;
+
+    /** The time at which this timer was last reset. */
+    protected long _startStamp;
+
+    /** The timer frequencies. */
+    protected long _mfrequency, _ufrequency;
+}