我期待创建监视一个DirectX应用程序的“FPS”(如FRAPS没有记录)的外部应用程序。我已看过一些Microsoft articles on performance measuring tools - 但我希望得到社会各界的反馈(和经验)。
我的问题:什么是获得的DirectX应用程序的FPS最好的方法是什么?
用Fraps插入DLL到每一个运行的应用程序和挂钩的具体要求DX找出帧率和捕获视频,相当肯定,你必须做同样的事情。有点闲逛之后,我发现一个Github上项目,做做捕获和覆盖一些基本的DX挂钩,所以这可能是一个好地方下手了。虽然我没有亲自使用过它,所以我不能完全担保的质量。
Windows有涉及到DirectX剖析一些Event Tracing for Windows提供商。最intresting的有Microsoft-Windows-D3D9
和Microsoft-Windows-DXGI
,这让跟踪帧展现的事件。计算FPS的最简单的方法是计算PresentStart事件withing的时间间隔的数目,并将其除以区间的长度。
与ETW在C#中工作,安装Microsoft.Diagnostics.Tracing.TraceEvent包。
下面的代码示例显示正在运行的进程的FPS:
using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using System.Threading;
using Microsoft.Diagnostics.Tracing.Session;
namespace ConsoleApp1
{
//helper class to store frame timestamps
public class TimestampCollection
{
const int MAXNUM = 1000;
public string Name { get; set; }
List<long> timestamps = new List<long>(MAXNUM + 1);
object sync = new object();
//add value to the collection
public void Add(long timestamp)
{
lock (sync)
{
timestamps.Add(timestamp);
if (timestamps.Count > MAXNUM) timestamps.RemoveAt(0);
}
}
//get the number of timestamps withing interval
public int QueryCount(long from, long to)
{
int c = 0;
lock (sync)
{
foreach (var ts in timestamps)
{
if (ts >= from && ts <= to) c++;
}
}
return c;
}
}
class Program
{
//event codes (https://github.com/GameTechDev/PresentMon/blob/40ee99f437bc1061a27a2fc16a8993ee8ce4ebb5/PresentData/PresentMonTraceConsumer.cpp)
public const int EventID_D3D9PresentStart = 1;
public const int EventID_DxgiPresentStart = 42;
//ETW provider codes
public static readonly Guid DXGI_provider = Guid.Parse("{CA11C036-0102-4A2D-A6AD-F03CFED5D3C9}");
public static readonly Guid D3D9_provider = Guid.Parse("{783ACA0A-790E-4D7F-8451-AA850511C6B9}");
static TraceEventSession m_EtwSession;
static Dictionary<int, TimestampCollection> frames = new Dictionary<int, TimestampCollection>();
static Stopwatch watch = null;
static object sync = new object();
static void EtwThreadProc()
{
//start tracing
m_EtwSession.Source.Process();
}
static void OutputThreadProc()
{
//console output loop
while (true)
{
long t1, t2;
long dt = 2000;
Console.Clear();
Console.WriteLine(DateTime.Now.ToString() + "." + DateTime.Now.Millisecond.ToString());
Console.WriteLine();
lock (sync)
{
t2 = watch.ElapsedMilliseconds;
t1 = t2 - dt;
foreach (var x in frames.Values)
{
Console.Write(x.Name + ": ");
//get the number of frames
int count = x.QueryCount(t1, t2);
//calculate FPS
Console.WriteLine("{0} FPS", (double)count / dt * 1000.0);
}
}
Console.WriteLine();
Console.WriteLine("Press any key to stop tracing...");
Thread.Sleep(1000);
}
}
public static void Main(string[] argv)
{
//create ETW session and register providers
m_EtwSession = new TraceEventSession("mysess");
m_EtwSession.StopOnDispose = true;
m_EtwSession.EnableProvider("Microsoft-Windows-D3D9");
m_EtwSession.EnableProvider("Microsoft-Windows-DXGI");
//handle event
m_EtwSession.Source.AllEvents += data =>
{
//filter out frame presentation events
if (((int)data.ID == EventID_D3D9PresentStart && data.ProviderGuid == D3D9_provider) ||
((int)data.ID == EventID_DxgiPresentStart && data.ProviderGuid == DXGI_provider))
{
int pid = data.ProcessID;
long t;
lock (sync)
{
t = watch.ElapsedMilliseconds;
//if process is not yet in Dictionary, add it
if (!frames.ContainsKey(pid))
{
frames[pid] = new TimestampCollection();
string name = "";
var proc = Process.GetProcessById(pid);
if (proc != null)
{
using (proc)
{
name = proc.ProcessName;
}
}
else name = pid.ToString();
frames[pid].Name = name;
}
//store frame timestamp in collection
frames[pid].Add(t);
}
}
};
watch = new Stopwatch();
watch.Start();
Thread thETW = new Thread(EtwThreadProc);
thETW.IsBackground = true;
thETW.Start();
Thread thOutput = new Thread(OutputThreadProc);
thOutput.IsBackground = true;
thOutput.Start();
Console.ReadKey();
m_EtwSession.Dispose();
}
}
}
基于PresentMon项目的源代码。