Window title updated with Timer eventhandler.

Posted Friday, 28 November, 2008 - 09:27 by flopoloco in

Programming Support

Hello, with this application I want to know how much FPS I got in my OpenTK applications but I have some difficulties. Too bad I spoil the surprise (instead of posting the forum example category) but I hope that learning is the process of completeness.

The point, is that I do not want to get update and render information as fast as the application updates, I want to get the values every 1 second (or an amount of time that is understood by humans). I found useful to use the System.Forms.Timer class and it appears to work fine. The problem is that information in window title is updated as soon as I move the window (Invoking Form Events).

I do not know if there is something in OpenTK or Windows.Forms I will have to look, I am confused... Any ideas?

using System;
using System.Windows.Forms;
using OpenTK;
using OpenTK.Graphics;
 
namespace TestTK
{
	internal class MainApplication : GameWindow
	{
		private Timer fpsDisplayTimer;
		private double openTkUpdateFPSDisplay = 0.0;
		private double openTkRenderFPSDisplay = 0.0;
 
		public override void OnLoad(EventArgs e)
		{
			fpsDisplayTimer = new Timer();
			fpsDisplayTimer.Tick += new EventHandler(FpsDisplayTimerUpdate);
			fpsDisplayTimer.Interval = 1000;
			fpsDisplayTimer.Start();
		}
 
		public override void OnRenderFrame(RenderFrameEventArgs e)
		{
			this.openTkRenderFPSDisplay = (1.0 / e.Time);
		}
 
		public override void OnUpdateFrame(UpdateFrameEventArgs e)
		{
			this.openTkUpdateFPSDisplay = (1.0 / e.Time);
		}
 
		// Point of interest.
		private void FpsDisplayTimerUpdate(object sender, EventArgs e)
		{
			// Window title can not be updated...
			this.Title = string.Format("Update FPS: {0} | Render FPS: {1}",
			this.openTkUpdateFPSDisplay.ToString("F2"),
			this.openTkRenderFPSDisplay.ToString("F2"));
		}
	}
 
	public class Program
	{
		[STAThread]
		public static void Main()
		{
			using (MainApplication mainApplication = new MainApplication())
			{
				mainApplication.Run(60.0);
			}
		}
	}
}

Thanks. :)

Comments

You cannot use the winforms Timer on non-winforms applications. You should use the System.Timer instead.

Since the System.Timer fires its Elapsed event on a different thread, you cannot directly modify the GameWindow title. What you should do is add a flag (bool fpsUpdate) that indicates whether it's time to update the title:

using System;
using System.Timers;
using OpenTK;
using OpenTK.Graphics;
 
namespace TestTK
{
    internal class MainApplication : GameWindow
    {
        private Timer fpsDisplayTimer;
        private double openTkUpdateFPSDisplay = 0.0;
        private double openTkRenderFPSDisplay = 0.0;
        private bool fpsUpdate = false;
 
        public override void OnLoad(EventArgs e)
        {
            fpsDisplayTimer = new Timer();
            fpsDisplayTimer.Elapsed += new ElapsedEventHandler(fpsDisplayTimer_Elapsed);
            fpsDisplayTimer.Interval = 1000;
            fpsDisplayTimer.Start();
        }
 
        public override void OnRenderFrame(RenderFrameEventArgs e)
        {
            GL.Clear(ClearBufferMask.ColorBufferBit);
 
            this.openTkRenderFPSDisplay = (1.0 / e.Time);
 
            SwapBuffers();
        }
 
        public override void OnUpdateFrame(UpdateFrameEventArgs e)
        {
            this.openTkUpdateFPSDisplay = (1.0 / e.Time);
 
            if (fpsUpdate)
            {
                this.Title = string.Format("Update FPS: {0} | Render FPS: {1}",
                    this.openTkUpdateFPSDisplay.ToString("F2"),
                    this.openTkRenderFPSDisplay.ToString("F2"));
 
                fpsUpdate = false;
            }
        }
 
        void fpsDisplayTimer_Elapsed(object sender, ElapsedEventArgs e)
        {
            fpsUpdate = true;  // 1 second passed, indicate that we should update.
        }
    }
 
    public class Program
    {
        [STAThread]
        public static void Main()
        {
            using (MainApplication mainApplication = new MainApplication())
            {
                mainApplication.Run(60.0);
            }
        }
    }
}

flopoloco: I think the GLControl tutorial in the docs does just this - without any timer. Check it out:

http://opentk.com/doc/chapter/2/glcontrol

Oh... You are definitely correct, I had confused the System.Timer with Forms.Timer :P, thanks for the help!

Home of the Open Toolkit library

Window title updated with Timer eventhandler.

Comments

Comment viewing options

Re: Window title updated with Timer eventhandler.

Re: Window title updated with Timer eventhandler.

Re: Window title updated with Timer eventhandler.

Recent