Profiler.cs

using System;
using System.Diagnostics;

namespace Project
{
    public class Profiler
    {
        public struct CallTreeNode
        {
            public int ParentIndex;
            public string Name;
            public TimeSpan StartDelta;
            public TimeSpan StopDelta;
        }

        public Profiler(TracerCollection tracers)
        {
            tracer = tracers["PROFILE"];
            timer = new Stopwatch();

            callTree = new CallTreeNode[128];

            callTree[0].Name = "Frame";
            callTree[0].ParentIndex = -1;
            callTree[0].StartDelta = TimeSpan.Zero;

            currentNode = 0;
            nextNode = 1;
        }

        TraceSource tracer;
        Stopwatch timer;

        CallTreeNode[] callTree;
        int currentNode, nextNode;

        public void BeginFrame()
        {
            nextNode = 1;

            tracer.TraceEvent(TraceEventType.Start, 0, "Frame t=0");
        }

        public void BeginOperation(string message, params object[] args)
        {
            string caption;
            if (args.Length == 0)
                caption = message;
            else
                caption = string.Format(message, args);

            callTree[nextNode].Name = caption;
            callTree[nextNode].ParentIndex = currentNode;

            currentNode = nextNode;
            nextNode += 1;

            TimeSpan timestamp = timer.Elapsed;
            tracer.TraceEvent(TraceEventType.Start, currentNode, message + " t=" + timestamp.Ticks);
            callTree[currentNode].StartDelta = timestamp;
        }

        public void EndOperation()
        {
            TimeSpan timestamp = timer.Elapsed;

            tracer.TraceEvent(TraceEventType.Stop, currentNode, callTree[currentNode].Name + " t=" + timestamp.Ticks);
            callTree[currentNode].StopDelta = timestamp;

            currentNode = callTree[currentNode].ParentIndex;
        }

        public void EndFrame()
        {
            timer.Stop();

            if (currentNode != 0)
                throw new InvalidOperationException("All logical operations have to end before the next frame. Please make sure all calls to BeginOperation are matched with a call to EndOperation.");

            tracer.TraceEvent(TraceEventType.Stop, 0, "Frame t=" + timer.Elapsed.Ticks);
            callTree[0].StopDelta = timer.Elapsed;
        }
    }
}