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ashwin/OpenTKExample.cs

Created June 7, 2013 04:20
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  1. ashwin created this gist Jun 7, 2013.
    89 changes: 89 additions & 0 deletions OpenTKExample.cs
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    // C# example program to demonstrate OpenTK
    //
    // Steps:
    // 1. Create an empty C# console application project in Visual Studio
    // 2. Place OpenTK.dll in the directory of the C# source file
    // 3. Add System.Drawing and OpenTK as References to the project
    // 4. Paste this source code into the C# source file
    // 5. Run. You should see a colored triangle. Press ESC to quit.
    //
    // Copyright (c) 2013 Ashwin Nanjappa
    // Released under the MIT License

    using System;
    using OpenTK;
    using OpenTK.Graphics;
    using OpenTK.Graphics.OpenGL;
    using OpenTK.Input;

    namespace StarterKit
    {
    class Game : GameWindow
    {
    public Game()
    : base(800, 600, GraphicsMode.Default, "OpenTK Quick Start Sample")
    {
    VSync = VSyncMode.On;
    }

    protected override void OnLoad(EventArgs e)
    {
    base.OnLoad(e);

    GL.ClearColor(0.1f, 0.2f, 0.5f, 0.0f);
    GL.Enable(EnableCap.DepthTest);
    }

    protected override void OnResize(EventArgs e)
    {
    base.OnResize(e);

    GL.Viewport(ClientRectangle.X, ClientRectangle.Y, ClientRectangle.Width, ClientRectangle.Height);

    Matrix4 projection = Matrix4.CreatePerspectiveFieldOfView((float)Math.PI / 4, Width / (float)Height, 1.0f, 64.0f);
    GL.MatrixMode(MatrixMode.Projection);
    GL.LoadMatrix(ref projection);
    }

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

    if (Keyboard[Key.Escape])
    Exit();
    }

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

    GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);

    Matrix4 modelview = Matrix4.LookAt(Vector3.Zero, Vector3.UnitZ, Vector3.UnitY);
    GL.MatrixMode(MatrixMode.Modelview);
    GL.LoadMatrix(ref modelview);

    GL.Begin(BeginMode.Triangles);

    GL.Color3(1.0f, 1.0f, 0.0f); GL.Vertex3(-1.0f, -1.0f, 4.0f);
    GL.Color3(1.0f, 0.0f, 0.0f); GL.Vertex3(1.0f, -1.0f, 4.0f);
    GL.Color3(0.2f, 0.9f, 1.0f); GL.Vertex3(0.0f, 1.0f, 4.0f);

    GL.End();

    SwapBuffers();
    }

    [STAThread]
    static void Main()
    {
    // The 'using' idiom guarantees proper resource cleanup.
    // We request 30 UpdateFrame events per second, and unlimited
    // RenderFrame events (as fast as the computer can handle).
    using (Game game = new Game())
    {
    game.Run(30.0);
    }
    }
    }
    }