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Update FPS Counter 

Changes the FPS counter to fade.

Why: FPS counter has a bug where it doesn't normalize the frame count to
the time passed since last update. This can result in an error of 1 FPS.
When running at 30 FPS, that is ~3.33%. The lower the FPS, the worse
this error grows.

1) Adds a parameter for how often to update the FPS (e.g. 16 times per
second).

2) Normalizes to the number of seconds passed since last update (fixing
the bug).

3) Adds a smoothing parameter (e.g. weigh the most recent interval at
8x, and normalize with current displayed date). This results in less
jumpy FPS because it takes into account historical data.
This commit is contained in:
Meerkov 2016-09-28 21:04:53 -07:00
parent 7763f79e6f
commit 91c5eda526
1 changed files with 12 additions and 12 deletions
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24
BizHawk.Client.EmuHawk/MainForm.cs
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@ -1337,10 +1337,11 @@ namespace BizHawk.Client.EmuHawk
private bool _runloopFrameProgress;
private long _frameAdvanceTimestamp;
private long _frameRewindTimestamp;
private int _runloopFps;
private int _runloopLastFps;
private bool _runloopFrameadvance;
private long _runloopSecond;
private double _runloopLastFps;
private bool _runloopFrameadvance;
private double _runloopUpdatesPerSecond = 16.0;
private double _runloopFpsSmoothing = 8.0;
private long _runloopSecond;
private bool _runloopLastFf;
private bool _inResizeLoop;
@ -2768,20 +2769,19 @@ namespace BizHawk.Client.EmuHawk
GlobalWin.Tools.UpdateToolsBefore();
}
_runloopFps++;
_runloopLastFps+= _runloopFpsSmoothing;
if ((double)(currentTimestamp - _runloopSecond) / Stopwatch.Frequency >= 1.0)
{
_runloopLastFps = _runloopFps;
_runloopSecond = currentTimestamp;
_runloopFps = 0;
if ((currentTimestamp - _runloopSecond) * _runloopUpdatesPerSecond >= Stopwatch.Frequency)
{
_runloopLastFps = Stopwatch.Frequency * (_runloopLastFps / (Stopwatch.Frequency + (currentTimestamp - _runloopSecond) * _runloopFpsSmoothing));
_runloopSecond = currentTimestamp;
updateFpsString = true;
}
if (updateFpsString)
{
var fps_string = _runloopLastFps + " fps";
if (isRewinding)
var fps_string = string.Format("{0:0} fps", _runloopLastFps);
if (isRewinding)
{
if (IsTurboing || isFastForwarding)
{