using System;
using System.Collections;
using System.Text;
using System.Threading.Tasks;

using OpenTK;

namespace OpenGLTutorial1
{
	public class Program
	{
		static void Main ()
		{
			Game window = new Game (640, 480);
			window.Run ();
		}
	}
}




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


namespace OpenGLTutorial1
{
	public class Game : GameWindow
	{
		int texture;

		public Game(int width, int height): base (width, height)
		{
			GL.Enable (EnableCap.Texture2D);
		}

		protected override void OnLoad(EventArgs e)
		{
			base.OnLoad (e);
			texture = ContentPipe.LoadTexture("tiles.png");
		}

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

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

			GL.Clear (ClearBufferMask.ColorBufferBit);
			GL.ClearColor (Color.CornflowerBlue);
			GL.BindTexture (TextureTarget.Texture2D, texture);

			GL.Begin (PrimitiveType.Quads);

			GL.Color3 (Color.Red);
			GL.TexCoord2 (0, 0);
			GL.Vertex2 (0, 0);

			GL.Color3 (Color.Blue);
			GL.TexCoord2 (1, 0);
			GL.Vertex2 (1, 0);

			GL.Color3 (Color.Green);
			GL.TexCoord2 (1, -1);
			GL.Vertex2 (1, -1);

			GL.Color3 (Color.Orange);
			GL.TexCoord2 (0, -1);
			GL.Vertex2 (0, -1);

			GL.End ();

			this.SwapBuffers ();
		}

	}
}






using System;
using System.Collections.Generic;
using System.Text;
using System.Threading.Tasks;
using System.IO;

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

namespace OpenGLTutorial1
{

	public class ContentPipe
	{
		public static int LoadTexture (string path)
		{
			if(!File.Exists ("Content/" + path))
			{
				throw new FileNotFoundException("File not found at Content/" + path + ".");
			}

			int id = GL.GenTexture ();
			GL.BindTexture (TextureTarget.Texture2D, id);

			Bitmap bmp = new Bitmap ("Content/" + path);
			BitmapData data = bmp.LockBits
				(
					new Rectangle (0, 0, bmp.Width, bmp.Height),
					System.Drawing.Imaging.ImageLockMode.ReadOnly,
					System.Drawing.Imaging.PixelFormat.Format32bppArgb
				 );
			GL.TexImage2D
				(
					TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba,
					data.Width, data.Height, 0, OpenTK.Graphics.OpenGL.PixelFormat.Bgra,
					PixelType.UnsignedInt, data.Scan0
				);

			bmp.UnlockBits (data);
			GL.TexParameter (TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)
			                TextureWrapMode.Clamp);
			GL.TexParameter (TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)
			                 TextureWrapMode.Clamp);
			GL.TexParameter (TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)
			                 TextureMinFilter.Linear);
			GL.TexParameter (TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)
			                 TextureMagFilter.Linear);
			return id;

		}
	}
}