Main.cs

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

namespace RayTracer
{
	public class OpenTKApp : GameWindow
	{
		static int screenID;            // unique integer identifier of the OpenGL texture
		static MyApplication app;       // instance of the application
		static bool terminated = false; // application terminates gracefully when this is true
		protected override void OnLoad( EventArgs e )
		{
			// called during application initialization
			GL.ClearColor( 0, 0, 0, 0 );
			GL.Enable( EnableCap.Texture2D );
			GL.Disable( EnableCap.DepthTest );
			GL.Hint( HintTarget.PerspectiveCorrectionHint, HintMode.Nicest );
			ClientSize = new Size( 1024, 512 );

			// initialise screen
			app = new MyApplication();
			app.screen = new Surface( Width, Height );

			Sprite.target = app.screen;
			screenID = app.screen.GenTexture();
			app.Init();
		}
		protected override void OnUnload( EventArgs e )
		{
			// called upon app close
			GL.DeleteTextures( 1, ref screenID );
			Environment.Exit( 0 );      // bypass wait for key on CTRL-F5
		}
		protected override void OnResize( EventArgs e )
		{
			// called upon window resize. Note: does not change the size of the pixel buffer.
			GL.Viewport( 0, 0, Width, Height );
			GL.MatrixMode( MatrixMode.Projection );
			GL.LoadIdentity();
			GL.Ortho( -1.0, 1.0, -1.0, 1.0, 0.0, 4.0 );
			app.screen = new Surface(Width, Height);
			app.OnResize(Width, Height);
		}
		protected override void OnUpdateFrame( FrameEventArgs e )
		{
			// called once per frame; app logic
			var keyboard = OpenTK.Input.Keyboard.GetState();
			if( keyboard[OpenTK.Input.Key.Escape] ) terminated = true;

			if (keyboard.IsAnyKeyDown)
				app.KeyboardPress(keyboard);
		}
		protected override void OnRenderFrame( FrameEventArgs e )
		{
			// called once per frame; render
			app.Tick();
			if( terminated )
			{
				Exit();
				return;
			}
			// convert MyApplication.screen to OpenGL texture
			GL.BindTexture( TextureTarget.Texture2D, screenID );
			GL.TexImage2D( TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba,
						   app.screen.width, app.screen.height, 0,
						   OpenTK.Graphics.OpenGL.PixelFormat.Bgra,
						   PixelType.UnsignedByte, app.screen.pixels
						 );
			// draw screen filling quad
			GL.Begin( PrimitiveType.Quads );
			GL.TexCoord2( 0.0f, 1.0f ); GL.Vertex2( -1.0f, -1.0f );
			GL.TexCoord2( 1.0f, 1.0f ); GL.Vertex2( 1.0f, -1.0f );
			GL.TexCoord2( 1.0f, 0.0f ); GL.Vertex2( 1.0f, 1.0f );
			GL.TexCoord2( 0.0f, 0.0f ); GL.Vertex2( -1.0f, 1.0f );
			GL.End();
			// tell OpenTK we're done rendering
			SwapBuffers();
		}
		public static void Main( string[] args )
		{
			// entry point
			using( OpenTKApp app = new OpenTKApp() ) { app.Run( 30.0, 0.0 ); }
		}
	}
}