using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using OpenTK;
using OpenTK.Graphics;
using OpenTK.Graphics.OpenGL;

namespace GPUBenchmark
{
    class Program
    {
        static readonly DateTime EPOCH = new DateTime(1970, 1, 1);
        static Random r = new Random((int) (DateTime.Now - EPOCH).TotalMilliseconds);
        static GameWindow w;
        static double lastTime;

        static void Main(string[] args)
        {
            w = new GameWindow(640, 480);
            w.RenderFrame += new EventHandler<FrameEventArgs>(w_RenderFrame);
            w.UpdateFrame += new EventHandler<FrameEventArgs>(w_UpdateFrame);
            GL.Ortho(-1, 1, -1, 1, 0.1, 1000);
            GL.Viewport(w.ClientRectangle);
            w.Run(60, 60);
        }

        static void w_UpdateFrame(object sender, FrameEventArgs e)
        {
            for (int i = 0; i < 100000; i++)
            {
                double rnd = r.NextDouble();
                double hash1 = rnd.GetHashCode();
                for (int ii = 0; ii < 16; ii++)
                    hash1 = hash1.GetHashCode();
            }
        }

        static void w_RenderFrame(object sender, FrameEventArgs e)
        {
            lastTime = (DateTime.Now - EPOCH).TotalMilliseconds;
            GL.Begin(BeginMode.Triangles);
            for (int i = 0; i < 100000; i++)
            {
                GL.Color3(r.NextDouble(), r.NextDouble(), r.NextDouble());
                GL.Vertex3(r.NextDouble() - 0.5, r.NextDouble() - 0.5, r.NextDouble() - 0.5);
                GL.Vertex3(r.NextDouble() - 0.5, r.NextDouble() - 0.5, r.NextDouble() - 0.5);
                GL.Vertex3(r.NextDouble() - 0.5, r.NextDouble() - 0.5, r.NextDouble() - 0.5);
            }
            GL.End();
            w.SwapBuffers();
            double curTime = (DateTime.Now - EPOCH).TotalMilliseconds;
            double frameLenMS = curTime - lastTime;
            double fps = 1.0 / (frameLenMS / 1000.0);
            w.Title = string.Format("FPS: {0}", fps.ToString("###.00"));
        }
    }
}