Start on refactoring of bandwidth metrics

interface/src/BandwidthRecorder.cpp

@@ -0,0 +1,63 @@
+//
+//  BandwidthMeter.cpp
+//  interface/src/ui
+//
+//  Created by Seth Alves on 2015-1-30
+//  Copyright 2015 High Fidelity, Inc.
+//
+//  Based on code by Tobias Schwinger
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+#include <GeometryCache.h>
+#include "BandwidthRecorder.h"
+
+
+BandwidthRecorder::Channel::Channel(char const* const caption,
+                                    char const* unitCaption,
+                                    double unitScale,
+                                    unsigned colorRGBA) :
+    caption(caption),
+    unitCaption(unitCaption),
+    unitScale(unitScale),
+    colorRGBA(colorRGBA)
+{
+}
+
+
+
+BandwidthRecorder::BandwidthRecorder() {
+}
+
+
+BandwidthRecorder::~BandwidthRecorder() {
+    delete audioChannel;
+    delete avatarsChannel;
+    delete octreeChannel;
+    delete metavoxelsChannel;
+}
+
+
+BandwidthRecorder::Stream::Stream(float msToAverage) : _value(0.0f), _msToAverage(msToAverage) {
+    _prevTime.start();
+}
+
+
+void BandwidthRecorder::Stream::updateValue(double amount) {
+
+    // Determine elapsed time
+    double dt = (double)_prevTime.nsecsElapsed() / 1000000.0; // ns to ms
+
+    // Ignore this value when timer imprecision yields dt = 0
+    if (dt == 0.0) {
+        return;
+    }
+
+    _prevTime.start();
+
+    // Compute approximate average
+    _value = glm::mix(_value, amount / dt,
+                      glm::clamp(dt / _msToAverage, 0.0, 1.0));
+}

interface/src/BandwidthRecorder.h

@@ -0,0 +1,55 @@
+//
+//  BandwidthRecorder.h
+//
+//  Created by Seth Alves on 2015-1-30
+//  Copyright 2015 High Fidelity, Inc.
+//
+//  Based on code by Tobias Schwinger
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+
+#ifndef hifi_BandwidthRecorder_h
+#define hifi_BandwidthRecorder_h
+
+#include <QElapsedTimer>
+
+class BandwidthRecorder {
+ public:
+    BandwidthRecorder();
+    ~BandwidthRecorder();
+
+    // keep track of data rate in one direction
+    class Stream {
+    public:
+        Stream(float msToAverage = 3000.0f);
+        void updateValue(double amount);
+        double getValue() const { return _value; }
+    private:
+        double _value; // Current value.
+        double _msToAverage; // Milliseconds to average.
+        QElapsedTimer _prevTime; // Time of last feed.
+    };
+
+    // keep track of data rate in two directions as well as units and style to use during display
+    class Channel {
+    public:
+        Channel(char const* const caption, char const* unitCaption, double unitScale, unsigned colorRGBA);
+        Stream input;
+        Stream output;
+        char const* const caption;
+        char const* unitCaption;
+        double unitScale;
+        unsigned colorRGBA;
+    };
+
+    // create the channels we keep track of
+    Channel* audioChannel = new Channel("Audio", "Kbps", 8000.0 / 1024.0, 0x33cc99ff);
+    Channel* avatarsChannel = new Channel("Avatars", "Kbps", 8000.0 / 1024.0, 0xffef40c0);
+    Channel* octreeChannel = new Channel("Octree", "Kbps", 8000.0 / 1024.0, 0xd0d0d0a0);
+    Channel* metavoxelsChannel = new Channel("Metavoxels", "Kbps", 8000.0 / 1024.0, 0xd0d0d0a0);
+};
+
+#endif