Getting started with OpenTK
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();
}
}
}