I've struggled a lot with myself over whether I should use OpenGL or Direct3D. There is no blanket answer to this question that anyone can tell you. Both APIs have a very different feel and which one you prefer can only be decided on your own.

I just released GLDotNet Version 0.6.0.

Changelog:

• **GLDotNet.Toolkit**: Assembly containing simple app framework.
• **GLDotNet.Objects**: Assembly containing higher level objects such as Texture2D and VertexBuffer.
• More overloads added to GLContext class.
• byte and sbyte are now mapped correctly in generated code.
• Fixed the naming of some functions so as not to include type notation, i.e. Color4u.
• Decreased the number of enum values output.

Today I released a project I've been playing around with for a year or so on Codeplex. It's called GLDotNet. From the project description:

C# wrapper for OpenGL. Partially generated from the OpenGL spec and partially written by hand, the aim is to have a flexible and native feeling C# binding.

I have generated functions from the OpenGL spec excluding 1 or 2 but unfortunately of the generated code is untested. There is a demo project included in the source code. The Github repository is located here: https://github.com/smack0007/GLDotNet

I started experimenting with OpenTK and I had to look in a few places to put this code together, so I'm posting it here for anyone who might be looking for an easy getting started lesson.

I've set up a window similar to what I've been used to in Xna (CornflowerBlue 4 life). I've also set up a 2D projection matrix and drawn a triangle in a 2D fashion. You'll need to add a reference to the OpenTK assembly for your project in Visual Studio.

using System;
using System.Drawing;
using OpenTK;
using OpenTK.Graphics;
using OpenTK.Graphics.OpenGL;

namespace OpenTKApp1
{
    public class AppWindow : GameWindow
    {
        public AppWindow()
        {
            this.Title = "OpenTK App 1";
            this.WindowBorder = WindowBorder.Fixed;
            this.ClientSize = new Size(800, 600);            
        }

        protected override void OnRenderFrame(FrameEventArgs e)
        {
            base.OnRenderFrame(e);

            GL.ClearColor(Color.CornflowerBlue);
            GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);

            GL.MatrixMode(MatrixMode.Projection);
            GL.LoadIdentity();
            GL.Ortho(0, 800, 600, 0, -1, 1);
            GL.Viewport(0, 0, 800, 600);
            
            GL.Begin(BeginMode.Triangles);
            GL.Color3(Color.Red);
            GL.Vertex3(400, 150, 0);
            GL.Color3(Color.Green);
            GL.Vertex3(600, 450, 0);
            GL.Color3(Color.Blue);
            GL.Vertex3(200, 450, 0);
            GL.End();

            GL.Flush();
            this.SwapBuffers();
        }

        [STAThread]
        public static void Main()
        {
            AppWindow window = new AppWindow();
            window.Run();
        }
    }
}

I wrote my second OpenTK app. This time I'm drawing a sprite which you can move around the screen using the keyboard. I've included the source code after the jump or you can download it.