Really moved TextPrinter to OpenTK.Compatibility.

Source/Compatibility/Graphics/AlphaTexture2D.cs

@@ -0,0 +1,62 @@
+#region License
+//
+// The Open Toolkit Library License
+//
+// Copyright (c) 2006 - 2008 the Open Toolkit library, except where noted.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights to 
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do
+// so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+//
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Drawing;
+using System.Drawing.Imaging;
+using OpenTK.Graphics.OpenGL;
+
+namespace OpenTK.Graphics
+{
+    /// <summary>
+    /// Encapsulates an OpenGL texture.
+    /// </summary>
+    class AlphaTexture2D : Texture2D
+    {
+        #region Constructors
+
+        /// <summary>
+        /// Constructs a new Texture.
+        /// </summary>
+        public AlphaTexture2D(int width, int height)
+            : base(width, height)
+        { }
+
+        #endregion
+
+        #region Protected Members
+
+        protected override PixelInternalFormat InternalFormat
+        {
+            get { return PixelInternalFormat.Alpha; }
+        }
+
+        #endregion
+    }
+}

Source/Compatibility/Graphics/GraphicsResourceException.cs

@@ -0,0 +1,44 @@
+#region License
+//
+// The Open Toolkit Library License
+//
+// Copyright (c) 2006 - 2008 the Open Toolkit library, except where noted.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights to 
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do
+// so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+//
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace OpenTK.Graphics
+{
+    /// <summary>
+    /// Represents exceptions related to IGraphicsResources.
+    /// </summary>
+    public class GraphicsResourceException : Exception
+    {
+        /// <summary>Constructs a new GraphicsResourceException.</summary>
+        public GraphicsResourceException() : base() { }
+        /// <summary>Constructs a new string with the specified error message.</summary>
+        public GraphicsResourceException(string message) : base(message) { }
+    }
+}

Source/Compatibility/Graphics/IGraphicsResource.cs

@@ -0,0 +1,49 @@
+#region License
+//
+// The Open Toolkit Library License
+//
+// Copyright (c) 2006 - 2008 the Open Toolkit library, except where noted.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights to 
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do
+// so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+//
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace OpenTK.Graphics
+{
+    /// <summary>
+    /// Defines a common interface to all OpenGL resources.
+    /// </summary>
+    interface IGraphicsResource : IDisposable
+    {
+        /// <summary>
+        /// Gets the GraphicsContext that owns this resource.
+        /// </summary>
+        IGraphicsContext Context { get; }
+
+        /// <summary>
+        /// Gets the Id of this IGraphicsResource.
+        /// </summary>
+        int Id { get; }
+    }
+}

Source/Compatibility/Graphics/ITextPrinter.cs

@@ -0,0 +1,159 @@
+#region --- License ---
+/* Copyright (c) 2006, 2007 Stefanos Apostolopoulos
+ * See license.txt for license info
+ */
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Drawing;
+using OpenTK.Graphics.Text;
+
+namespace OpenTK.Graphics
+{
+    /// <summary>
+    /// Defines the interface for a TextPrinter.
+    /// </summary>
+    public interface ITextPrinter : IDisposable
+    {
+        #region Print
+
+        /// <summary>
+        /// Prints text using the specified color and layout options.
+        /// </summary>
+        /// <param name="text">The System.String to print.</param>
+        /// <param name="font">The System.Drawing.Font that will be used to print text.</param>
+        /// <param name="color">The System.Drawing.Color that will be used to print text.</param>
+        void Print(string text, Font font, Color color);
+
+        /// <summary>
+        /// Prints text using the specified color and layout options.
+        /// </summary>
+        /// <param name="text">The System.String to print.</param>
+        /// <param name="font">The System.Drawing.Font that will be used to print text.</param>
+        /// <param name="color">The System.Drawing.Color that will be used to print text.</param>
+        /// <param name="rect">The System.Drawing.Rectangle that defines the bounds for text layout.</param>
+        void Print(string text, Font font, Color color, RectangleF rect);
+
+        /// <summary>
+        /// Prints text using the specified color and layout options.
+        /// </summary>
+        /// <param name="text">The System.String to print.</param>
+        /// <param name="font">The System.Drawing.Font that will be used to print text.</param>
+        /// <param name="color">The System.Drawing.Color that will be used to print text.</param>
+        /// <param name="rect">The System.Drawing.Rectangle that defines the bounds for text layout.</param>
+        /// <param name="options">The OpenTK.Graphics.TextPrinterOptions that will be used to print text.</param>
+        void Print(string text, Font font, Color color, RectangleF rect, TextPrinterOptions options);
+
+        /// <summary>
+        /// Prints text using the specified color and layout options.
+        /// </summary>
+        /// <param name="text">The System.String to print.</param>
+        /// <param name="font">The System.Drawing.Font that will be used to print text.</param>
+        /// <param name="color">The System.Drawing.Color that will be used to print text.</param>
+        /// <param name="rect">The System.Drawing.Rectangle that defines the bounds for text layout.</param>
+        /// <param name="options">The OpenTK.Graphics.TextPrinterOptions that will be used to print text.</param>
+        /// <param name="alignment">The OpenTK.Graphics.TextAlignment that will be used to print text.</param>
+        void Print(string text, Font font, Color color, RectangleF rect, TextPrinterOptions options, TextAlignment alignment);
+
+        /// <summary>
+        /// Prints text using the specified color and layout options.
+        /// </summary>
+        /// <param name="text">The System.String to print.</param>
+        /// <param name="font">The System.Drawing.Font that will be used to print text.</param>
+        /// <param name="color">The System.Drawing.Color that will be used to print text.</param>
+        /// <param name="rect">The System.Drawing.Rectangle that defines the bounds for text layout.</param>
+        /// <param name="options">The OpenTK.Graphics.TextPrinterOptions that will be used to print text.</param>
+        /// <param name="alignment">The OpenTK.Graphics.TextAlignment that will be used to print text.</param>
+        /// <param name="direction">The OpenTK.Graphics.TextDirection that will be used to print text.</param>
+        void Print(string text, Font font, Color color, RectangleF rect, TextPrinterOptions options, TextAlignment alignment, TextDirection direction);
+
+        #endregion
+
+        #region Measure
+
+        /// <summary>
+        /// Measures text using the specified layout options.
+        /// </summary>
+        /// <param name="text">The System.String to measure.</param>
+        /// <param name="font">The System.Drawing.Font that will be used to measure text.</param>
+        /// <returns>An OpenTK.Graphics.TextExtents instance that contains the results of the measurement.</returns>
+        TextExtents Measure(string text, Font font);
+
+        /// <summary>
+        /// Measures text using the specified layout options.
+        /// </summary>
+        /// <param name="text">The System.String to measure.</param>
+        /// <param name="font">The System.Drawing.Font that will be used to measure text.</param>
+        /// <param name="rect">The System.Drawing.Rectangle that defines the bounds for text layout.</param>
+        /// <returns>An OpenTK.Graphics.TextExtents instance that contains the results of the measurement.</returns>
+        TextExtents Measure(string text, Font font, RectangleF rect);
+
+        /// <summary>
+        /// Measures text using the specified layout options.
+        /// </summary>
+        /// <param name="text">The System.String to measure.</param>
+        /// <param name="font">The System.Drawing.Font that will be used to measure text.</param>
+        /// <param name="rect">The System.Drawing.Rectangle that defines the bounds for text layout.</param>
+        /// <param name="options">The OpenTK.Graphics.TextPrinterOptions that will be used to measure text.</param>
+        /// <returns>An OpenTK.Graphics.TextExtents instance that contains the results of the measurement.</returns>
+        TextExtents Measure(string text, Font font, RectangleF rect, TextPrinterOptions options);
+
+        /// <summary>
+        /// Measures text using the specified layout options.
+        /// </summary>
+        /// <param name="text">The System.String to measure.</param>
+        /// <param name="font">The System.Drawing.Font that will be used to measure text.</param>
+        /// <param name="rect">The System.Drawing.Rectangle that defines the bounds for text layout.</param>
+        /// <param name="options">The OpenTK.Graphics.TextPrinterOptions that will be used to measure text.</param>
+        /// <param name="alignment">The OpenTK.Graphics.TextAlignment that will be used to measure text.</param>
+        /// <returns>An OpenTK.Graphics.TextExtents instance that contains the results of the measurement.</returns>
+        TextExtents Measure(string text, Font font, RectangleF rect, TextPrinterOptions options, TextAlignment alignment);
+
+        /// <summary>
+        /// Measures text using the specified layout options.
+        /// </summary>
+        /// <param name="text">The System.String to measure.</param>
+        /// <param name="font">The System.Drawing.Font that will be used to measure text.</param>
+        /// <param name="rect">The System.Drawing.Rectangle that defines the bounds for text layout.</param>
+        /// <param name="options">The OpenTK.Graphics.TextPrinterOptions that will be used to measure text.</param>
+        /// <param name="alignment">The OpenTK.Graphics.TextAlignment that will be used to measure text.</param>
+        /// <param name="direction">The OpenTK.Graphics.TextDirection that will be used to measure text.</param>
+        /// <returns>An OpenTK.Graphics.TextExtents instance that contains the results of the measurement.</returns>
+        TextExtents Measure(string text, Font font, RectangleF rect, TextPrinterOptions options, TextAlignment alignment, TextDirection direction);
+
+        #endregion
+
+        #region Begin
+
+        /// <summary>
+        /// Sets up a resolution-dependent orthographic projection.
+        /// </summary>
+        void Begin();
+
+        #endregion
+
+        #region End
+
+        /// <summary>
+        /// Restores the projection and modelview matrices to their previous state.
+        /// </summary>
+        void End();
+
+        #endregion
+
+        #region Obsolete
+
+        [Obsolete("Use TextPrinter.Print instead")]
+        void Draw(TextHandle handle);
+
+        [Obsolete("Use TextPrinter.Print instead")]
+        void Draw(string text, TextureFont font);
+
+        [Obsolete("Use TextPrinter.Print instead")]
+        void Prepare(string text, TextureFont font, out TextHandle handle);
+
+        #endregion
+    }
+}

Source/Compatibility/Graphics/RgbaTexture2D.cs

@@ -0,0 +1,46 @@
+#region License
+//
+// The Open Toolkit Library License
+//
+// Copyright (c) 2006 - 2008 the Open Toolkit library, except where noted.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights to 
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do
+// so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+//
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using OpenTK.Graphics.OpenGL;
+
+namespace OpenTK.Graphics
+{
+    class RgbaTexture2D : Texture2D
+    {
+        public RgbaTexture2D(int width, int height)
+            : base(width, height)
+        { }
+
+        protected override PixelInternalFormat InternalFormat
+        {
+            get { return PixelInternalFormat.Rgba; }
+        }
+    }
+}

Source/Compatibility/Graphics/Text/CachedGlyphInfo.cs

@@ -0,0 +1,62 @@
+#region License
+//
+// The Open Toolkit Library License
+//
+// Copyright (c) 2006 - 2008 the Open Toolkit library, except where noted.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights to 
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do
+// so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+//
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Drawing;
+
+namespace OpenTK.Graphics.Text
+{
+    struct CachedGlyphInfo
+    {
+        public readonly Texture2D Texture;
+        public readonly RectangleF RectangleNormalized;
+        public Rectangle Rectangle
+        {
+            get
+            {
+                return new Rectangle(
+                    (int)(RectangleNormalized.X * Texture.Width),
+                    (int)(RectangleNormalized.Y * Texture.Height),
+                    (int)(RectangleNormalized.Width * Texture.Width),
+                    (int)(RectangleNormalized.Height * Texture.Height));
+            }
+        }
+
+        // Rect denotes the absolute position of the glyph in the texture [0, Texture.Width], [0, Texture.Height].
+        public CachedGlyphInfo(Texture2D texture, Rectangle rect)
+        {
+            Texture = texture;
+            RectangleNormalized = new RectangleF(
+                rect.X / (float)texture.Width,
+                rect.Y / (float)texture.Height,
+                rect.Width / (float)texture.Width,
+                rect.Height / (float)texture.Height);
+        }
+    }
+}

Source/Compatibility/Graphics/Text/GL11TextOutputProvider.cs

@@ -0,0 +1,64 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Drawing;
+using OpenTK.Graphics.OpenGL;
+
+namespace OpenTK.Graphics.Text
+{
+    sealed class GL11TextOutputProvider : GL1TextOutputProvider
+    {
+        #region Fields
+
+        TextQuality quality;
+        GlyphCache cache;
+
+        #endregion
+
+        #region Constuctors
+
+        public GL11TextOutputProvider(TextQuality quality)
+        {
+            if (quality == TextQuality.High || quality == TextQuality.Default)
+                this.quality = TextQuality.Medium;
+            else
+                this.quality = quality;
+        }
+
+        #endregion
+
+        #region Protected Members
+
+        protected override void SetBlendFunction()
+        {
+            GL.BlendFunc(BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha);  // For grayscale
+        }
+
+        protected override void SetColor(Color color)
+        {
+            GL.Color3(color);
+        }
+
+        protected override TextQuality TextQuality
+        {
+            get { return quality; }
+        }
+
+        protected override GlyphCache Cache
+        {
+            get
+            {
+                if (cache == null)
+                {
+                    if (GL.GetString(StringName.Renderer).Contains("ProSavage/Twister"))
+                        cache = new GlyphCache<RgbaTexture2D>();
+                    else
+                        cache = new GlyphCache<AlphaTexture2D>();
+                }
+                return cache;
+            }
+        }
+
+        #endregion
+    }
+}

Source/Compatibility/Graphics/Text/GL12TextOutputProvider.cs

@@ -0,0 +1,51 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Drawing;
+
+using OpenTK.Graphics.OpenGL;
+
+namespace OpenTK.Graphics.Text
+{
+    sealed class GL12TextOutputProvider : GL1TextOutputProvider
+    {
+        #region Fields
+
+        TextQuality quality;
+        GlyphCache cache;
+
+        #endregion
+
+        #region Constuctors
+
+        public GL12TextOutputProvider(TextQuality quality)
+        {
+            this.quality = quality;
+            
+            cache = new GlyphCache<RgbaTexture2D>();
+        }
+
+        #endregion
+
+        protected override void SetBlendFunction()
+        {
+            GL.BlendFunc(BlendingFactorSrc.ConstantColorExt, BlendingFactorDest.OneMinusSrcColor);
+        }
+
+        protected override void SetColor(Color color)
+        {
+            GL.Color3(Color.White);
+            GL.BlendColor(color);
+        }
+
+        protected override TextQuality TextQuality
+        {
+            get { return quality; }
+        }
+
+        protected override GlyphCache Cache
+        {
+            get { return cache; }
+        }
+    }
+}

Source/Compatibility/Graphics/Text/GL1TextOutputProvider.cs

@@ -0,0 +1,339 @@
+#region License
+//
+// The Open Toolkit Library License
+//
+// Copyright (c) 2006 - 2008 the Open Toolkit library, except where noted.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights to 
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do
+// so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+//
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+
+using OpenTK.Graphics.OpenGL;
+
+namespace OpenTK.Graphics.Text
+{
+    abstract class GL1TextOutputProvider : ITextOutputProvider
+    {
+        #region Fields
+
+        // Triangle lists, sorted by texture.
+        Dictionary<Texture2D, List<Vector2>> active_lists = new Dictionary<Texture2D, List<Vector2>>();
+        Queue<List<Vector2>> inactive_lists = new Queue<List<Vector2>>();
+
+        #pragma warning disable 0649
+        struct Viewport { public int X, Y, Width, Height; }
+        #pragma warning restore 0649
+
+        // Used to save the current state in Begin() and restore it in End()
+        Stack<Matrix4> projection_stack = new Stack<Matrix4>();
+        Stack<Matrix4> modelview_stack = new Stack<Matrix4>();
+        Stack<Matrix4> texture_stack = new Stack<Matrix4>();
+        Stack<Viewport> viewport_stack = new Stack<Viewport>();
+
+        // Used as temporary storage when saving / restoring the current state.
+        Viewport viewport = new Viewport();
+        Matrix4 matrix = new Matrix4();
+
+        // TextBlock - display list cache.
+        // Todo: we need a cache eviction strategy.
+        const int block_cache_capacity = 32;
+        readonly Dictionary<int, int> block_cache = new Dictionary<int, int>(block_cache_capacity);
+
+        bool disposed;
+
+        #endregion
+
+        #region Constructors
+
+        public GL1TextOutputProvider()
+        {
+            inactive_lists.Enqueue(new List<Vector2>());
+        }
+
+        #endregion
+
+        #region ITextOutputProvider Members
+
+        #region Print
+
+        public void Print(ref TextBlock block, Color color, IGlyphRasterizer rasterizer)
+        {
+            GL.PushAttrib(AttribMask.CurrentBit | AttribMask.TextureBit | AttribMask.EnableBit | AttribMask.ColorBufferBit | AttribMask.DepthBufferBit);
+
+            GL.Enable(EnableCap.Texture2D);
+            GL.Enable(EnableCap.Blend);
+            SetBlendFunction();
+
+            GL.Disable(EnableCap.DepthTest);
+
+            GL.TexEnv(TextureEnvTarget.TextureEnv, TextureEnvParameter.TextureEnvMode, (int)All.Modulate);
+            GL.TexEnv(TextureEnvTarget.TextureEnv, TextureEnvParameter.TextureEnvColor, new Color4(0, 0, 0, 0));
+
+            GL.Disable(EnableCap.TextureGenQ);
+            GL.Disable(EnableCap.TextureGenR);
+            GL.Disable(EnableCap.TextureGenS);
+            GL.Disable(EnableCap.TextureGenT);
+
+            RectangleF position;
+
+            SetColor(color);
+            
+            int block_hash = block.GetHashCode();
+            if (block_cache.ContainsKey(block_hash))
+            {
+                GL.CallList(block_cache[block_hash]);
+            }
+            else
+            {
+                using (TextExtents extents = rasterizer.MeasureText(ref block))
+                {
+                    // Build layout
+                    int current = 0;
+                    foreach (Glyph glyph in block)
+                    {
+                        // Do not render whitespace characters or characters outside the clip rectangle.
+                        if (glyph.IsWhiteSpace || extents[current].Width == 0 || extents[current].Height == 0)
+                        {
+                            current++;
+                            continue;
+                        }
+                        else if (!Cache.Contains(glyph))
+                            Cache.Add(glyph, rasterizer, TextQuality);
+
+                        CachedGlyphInfo info = Cache[glyph];
+                        position = extents[current++];
+
+                        // Use the real glyph width instead of the measured one (we want to achieve pixel perfect output).
+                        position.Size = info.Rectangle.Size;
+
+                        if (!active_lists.ContainsKey(info.Texture))
+                        {
+                            if (inactive_lists.Count > 0)
+                            {
+                                List<Vector2> list = inactive_lists.Dequeue();
+                                list.Clear();
+                                active_lists.Add(info.Texture, list);
+                            }
+                            else
+                            {
+                                active_lists.Add(info.Texture, new List<Vector2>());
+                            }
+                        }
+
+                        {
+                            // Interleaved array: Vertex, TexCoord, Vertex, ...
+                            List<Vector2> current_list = active_lists[info.Texture];
+                            current_list.Add(new Vector2(info.RectangleNormalized.Left, info.RectangleNormalized.Top));
+                            current_list.Add(new Vector2(position.Left, position.Top));
+                            current_list.Add(new Vector2(info.RectangleNormalized.Left, info.RectangleNormalized.Bottom));
+                            current_list.Add(new Vector2(position.Left, position.Bottom));
+                            current_list.Add(new Vector2(info.RectangleNormalized.Right, info.RectangleNormalized.Bottom));
+                            current_list.Add(new Vector2(position.Right, position.Bottom));
+
+                            current_list.Add(new Vector2(info.RectangleNormalized.Right, info.RectangleNormalized.Bottom));
+                            current_list.Add(new Vector2(position.Right, position.Bottom));
+                            current_list.Add(new Vector2(info.RectangleNormalized.Right, info.RectangleNormalized.Top));
+                            current_list.Add(new Vector2(position.Right, position.Top));
+                            current_list.Add(new Vector2(info.RectangleNormalized.Left, info.RectangleNormalized.Top));
+                            current_list.Add(new Vector2(position.Left, position.Top));
+                        }
+                    }
+                }
+
+                // Render
+                int display_list = 0;
+                if ((block.Options & TextPrinterOptions.NoCache) == 0)
+                {
+                    display_list = GL.GenLists(1);
+                    // Mesa Indirect gerates an InvalidOperation error right after
+                    // GL.EndList() when using ListMode.CompileAndExecute.
+                    // Using ListMode.Compile as a workaround.
+                    GL.NewList(display_list, ListMode.Compile);
+                }
+                foreach (Texture2D key in active_lists.Keys)
+                {
+                    List<Vector2> list = active_lists[key];
+
+                    key.Bind();
+
+                    GL.Begin(BeginMode.Triangles);
+
+                    for (int i = 0; i < list.Count; i += 2)
+                    {
+                        GL.TexCoord2(list[i]);
+                        GL.Vertex2(list[i + 1]);
+                    }
+
+                    GL.End();
+                }
+                if ((block.Options & TextPrinterOptions.NoCache) == 0)
+                {
+                    GL.EndList();
+                    block_cache.Add(block_hash, display_list);
+                    GL.CallList(display_list);
+                }
+
+                // Clean layout
+                foreach (List<Vector2> list in active_lists.Values)
+                {
+                    //list.Clear();
+                    inactive_lists.Enqueue(list);
+                }
+
+                active_lists.Clear();
+            }
+            
+            GL.PopAttrib();
+        }
+
+        #endregion
+
+        #region Clear
+
+        public void Clear()
+        {
+            Cache.Clear();
+			foreach (int display_list in block_cache.Keys)
+				GL.DeleteLists(display_list, 1);
+			block_cache.Clear();
+        }
+
+        #endregion
+
+        #region Begin
+
+        public void Begin()
+        {
+            if (disposed)
+                throw new ObjectDisposedException(this.GetType().ToString());
+
+            GraphicsContext.Assert();
+
+            // Save the state of everything we are going to modify:
+            // the current matrix mode, viewport state and the projection, modelview and texture matrices.
+            // All these will be restored in the TextPrinter.End() method.
+            int current_matrix;
+            GL.GetInteger(GetPName.MatrixMode, out current_matrix);
+
+            GL.GetInteger(GetPName.Viewport, out viewport.X);
+            viewport_stack.Push(viewport);
+
+            GL.GetFloat(GetPName.ProjectionMatrix, out matrix.Row0.X);
+            projection_stack.Push(matrix);
+            GL.GetFloat(GetPName.ModelviewMatrix, out matrix.Row0.X);
+            modelview_stack.Push(matrix);
+            GL.GetFloat(GetPName.TextureMatrix, out matrix.Row0.X);
+            texture_stack.Push(matrix);
+
+            // Prepare to draw text. We want pixel perfect precision, so we setup a 2D mode,
+            // with size equal to the window (in pixels). 
+            // While we could also render text in 3D mode, it would be very hard to get
+            // pixel-perfect precision.
+            GL.MatrixMode(MatrixMode.Projection);
+            GL.LoadIdentity();
+            GL.Ortho(viewport.X, viewport.Width, viewport.Height, viewport.Y, -1.0, 1.0);
+
+            GL.MatrixMode(MatrixMode.Modelview);
+            GL.LoadIdentity();
+
+            GL.MatrixMode(MatrixMode.Texture);
+            GL.LoadIdentity();
+
+            GL.MatrixMode((MatrixMode)current_matrix);
+        }
+
+        #endregion
+
+        #region End
+
+        public void End()
+        {
+            if (disposed)
+                throw new ObjectDisposedException(this.GetType().ToString());
+
+            GraphicsContext.Assert();
+
+            int current_matrix;
+            GL.GetInteger(GetPName.MatrixMode, out current_matrix);
+
+            viewport = viewport_stack.Pop();
+            GL.Viewport(viewport.X, viewport.Y, viewport.Width, viewport.Height);
+
+            GL.MatrixMode(MatrixMode.Texture);
+            matrix = texture_stack.Pop();
+            GL.LoadMatrix(ref matrix);
+
+            GL.MatrixMode(MatrixMode.Modelview);
+            matrix = modelview_stack.Pop();
+            GL.LoadMatrix(ref matrix);
+
+            GL.MatrixMode(MatrixMode.Projection);
+            matrix = projection_stack.Pop();
+            GL.LoadMatrix(ref matrix);
+
+            GL.MatrixMode((MatrixMode)current_matrix);
+        }
+
+        #endregion
+
+        #endregion
+
+        #region Protected Members
+
+        protected abstract void SetBlendFunction();
+
+        protected abstract void SetColor(Color color);
+
+        protected abstract TextQuality TextQuality { get; }
+
+        protected abstract GlyphCache Cache { get; }
+
+        #endregion
+
+        #region Static Members
+
+        public static GL1TextOutputProvider Create(TextQuality quality)
+        {
+            if (!GL.SupportsExtension("Version12") || !GL.SupportsFunction("BlendColor") || quality == TextQuality.Low || quality == TextQuality.Medium)
+                return new GL11TextOutputProvider(quality);
+            else
+                return new GL12TextOutputProvider(quality);
+        }
+
+        #endregion
+
+        #region IDisposable Members
+
+        public void Dispose()
+        {
+            if (!disposed)
+            {
+                Cache.Dispose();
+                disposed = true;
+            }
+        }
+
+        #endregion
+    }
+}

Source/Compatibility/Graphics/Text/GdiPlusGlyphRasterizer.cs

@@ -0,0 +1,501 @@
+#region License
+//
+// The Open Toolkit Library License
+//
+// Copyright (c) 2006 - 2008 the Open Toolkit library, except where noted.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights to 
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do
+// so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+//
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Drawing;
+using System.Drawing.Imaging;
+using System.Drawing.Text;
+using OpenTK.Platform;
+
+namespace OpenTK.Graphics.Text
+{
+    sealed class GdiPlusGlyphRasterizer : IGlyphRasterizer
+    {
+        #region Fields
+
+        // Note: as an optimization, we store the TextBlock hashcode instead of the TextBlock itself.
+        Dictionary<int, TextExtents> block_cache = new Dictionary<int, TextExtents>();
+        System.Drawing.Graphics graphics = System.Drawing.Graphics.FromImage(new Bitmap(1, 1));
+
+        IntPtr[] regions = new IntPtr[GdiPlus.MaxMeasurableCharacterRanges];
+        CharacterRange[] characterRanges = new CharacterRange[GdiPlus.MaxMeasurableCharacterRanges];
+
+        Bitmap glyph_surface;
+        System.Drawing.Graphics glyph_renderer;
+
+        readonly List<RectangleF> measured_glyphs = new List<RectangleF>(256);
+
+        readonly ObjectPool<PoolableTextExtents> text_extents_pool = new ObjectPool<PoolableTextExtents>();
+
+        // Check the constructor, too, for additional flags.
+        // Used for measuring text. Can set the leftToRight, rightToLeft, vertical and measure trailing spaces flags.
+        readonly StringFormat measure_string_format = new StringFormat(StringFormat.GenericDefault);
+        readonly StringFormat measure_string_format_tight = new StringFormat(StringFormat.GenericTypographic);
+        // Used for loading glyphs. Only use leftToRight!
+        readonly StringFormat load_glyph_string_format = new StringFormat(StringFormat.GenericDefault);
+        readonly StringFormat load_glyph_string_format_tight = new StringFormat(StringFormat.GenericTypographic);
+
+        static readonly char[] newline_characters = new char[] { '\n', '\r' };
+
+        static readonly SizeF MaximumGraphicsClipSize;
+
+        #endregion
+
+        #region Constructors
+
+        static GdiPlusGlyphRasterizer()
+        {
+            using (Bitmap bmp = new Bitmap(1, 1))
+            using (System.Drawing.Graphics gfx = System.Drawing.Graphics.FromImage(bmp))
+            {
+                MaximumGraphicsClipSize = gfx.ClipBounds.Size;
+            }
+        }
+
+        public GdiPlusGlyphRasterizer()
+        {
+            measure_string_format.FormatFlags |= StringFormatFlags.MeasureTrailingSpaces | StringFormatFlags.NoClip;
+            measure_string_format_tight.FormatFlags |= StringFormatFlags.MeasureTrailingSpaces;
+        }
+
+        #endregion
+
+        #region IGlyphRasterizer Members
+
+        #region Rasterize
+
+        public Bitmap Rasterize(Glyph glyph)
+        {
+            return Rasterize(glyph, TextQuality.Default);
+        }
+
+        public Bitmap Rasterize(Glyph glyph, TextQuality quality)
+        {
+            EnsureSurfaceSize(ref glyph_surface, ref glyph_renderer, glyph.Font);
+            SetTextRenderingOptions(glyph_renderer, glyph.Font, quality);
+
+            RectangleF r2 = new RectangleF();
+
+            glyph_renderer.Clear(Color.Transparent);
+
+            glyph_renderer.DrawString(glyph.Character.ToString(), glyph.Font, Brushes.White, Point.Empty, //new Point(glyph_surface.Width, 0),
+                glyph.Font.Style == FontStyle.Italic ? load_glyph_string_format : load_glyph_string_format_tight);
+
+            r2 = FindEdges(glyph_surface, true);
+                
+            //if ((default_string_format.FormatFlags & StringFormatFlags.DirectionRightToLeft) != 0)
+            //{
+            //    glyph_renderer.DrawString(glyph.Character.ToString(), glyph.Font, Brushes.White, Point.Empty, //new Point(glyph_surface.Width, 0),
+            //        load_glyph_string_format);//glyph.Font.Style == FontStyle.Italic ? load_glyph_string_format : default_string_format);
+
+            //    r2 = FindEdges(glyph_surface, true);
+            //}
+            //else
+            //{
+            //    glyph_renderer.DrawString(glyph.Character.ToString(), glyph.Font, Brushes.White, Point.Empty,
+            //        load_glyph_string_format_tight); //glyph.Font.Style == FontStyle.Italic ? load_glyph_string_format : default_string_format);
+
+            //    r2 = FindEdges(glyph_surface, false);
+            //}
+
+            return glyph_surface.Clone(r2, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
+        }
+
+        #endregion
+
+        #region MeasureText
+
+        public TextExtents MeasureText(ref TextBlock block)
+        {
+            return MeasureText(ref block, TextQuality.Default);
+        }
+
+        public TextExtents MeasureText(ref TextBlock block, TextQuality quality)
+        {
+            // First, check if we have cached this text block. Do not use block_cache.TryGetValue, to avoid thrashing
+            // the user's TextBlockExtents struct.
+            int hashcode = block.GetHashCode();
+            if (block_cache.ContainsKey(hashcode))
+                return block_cache[hashcode];
+
+            // If this block is not cached, we have to measure it and (potentially) place it in the cache.
+            TextExtents extents = MeasureTextExtents(ref block, quality);
+            
+            if ((block.Options & TextPrinterOptions.NoCache) == 0)
+                block_cache.Add(hashcode, extents);
+
+            return extents;
+        }
+
+        #endregion
+
+        #region Clear
+
+        public void Clear()
+        {
+            block_cache.Clear();
+        }
+
+        #endregion
+
+        #endregion
+
+        #region Private Members
+
+        #region EnsureSurfaceSize
+
+        void EnsureSurfaceSize(ref Bitmap bmp, ref System.Drawing.Graphics gfx, Font font)
+        {
+            if (bmp == null || bmp.Width < 2 * font.Size || bmp.Height < 2 * font.Size)
+            {
+                if (bmp != null)
+                    bmp.Dispose();
+                if (gfx != null)
+                    gfx.Dispose();
+
+                bmp = new Bitmap((int)(2 * font.Size), (int)(2 * font.Size));
+                gfx = System.Drawing.Graphics.FromImage(bmp);
+            }
+        }
+
+        #endregion
+
+        #region SetRenderingOptions
+
+        // Modify rendering settings (antialiasing, grid fitting) to improve appearance.
+        void SetTextRenderingOptions(System.Drawing.Graphics gfx, Font font, TextQuality quality)
+        {
+            switch (quality)
+            {
+                case TextQuality.Default:
+                    gfx.TextRenderingHint = TextRenderingHint.SystemDefault;
+                    break;
+
+                case TextQuality.High:
+                    gfx.TextRenderingHint = TextRenderingHint.ClearTypeGridFit;
+                    break;
+                    
+                case TextQuality.Medium:
+                    if (font.Size <= 18.0f)
+                        gfx.TextRenderingHint = TextRenderingHint.AntiAliasGridFit;
+                    else
+                        gfx.TextRenderingHint = TextRenderingHint.AntiAlias;
+                    break;
+
+                case TextQuality.Low:
+                    if (font.Size <= 18.0f)
+                        gfx.TextRenderingHint = TextRenderingHint.SingleBitPerPixelGridFit;
+                    else
+                        gfx.TextRenderingHint = TextRenderingHint.SingleBitPerPixel;
+                    break;
+            }
+        }
+
+        #endregion
+
+        #region MeasureTextExtents
+
+        TextExtents MeasureTextExtents(ref TextBlock block, TextQuality quality)
+        {
+            // Todo: Parse layout options:
+            StringFormat format = block.Font.Italic ? measure_string_format : measure_string_format_tight;
+            //StringFormat format = measure_string_format_tight;
+
+            if (block.Direction == TextDirection.Vertical)
+                format.FormatFlags |= StringFormatFlags.DirectionVertical;
+            else
+                format.FormatFlags &= ~StringFormatFlags.DirectionVertical;
+
+            if (block.Direction == TextDirection.RightToLeft)
+                format.FormatFlags |= StringFormatFlags.DirectionRightToLeft;
+            else
+                format.FormatFlags &= ~StringFormatFlags.DirectionRightToLeft;
+
+            if (block.Alignment == TextAlignment.Near)
+                format.Alignment = StringAlignment.Near;
+            else if (block.Alignment == TextAlignment.Center)
+                format.Alignment = StringAlignment.Center;
+            else
+                format.Alignment = StringAlignment.Far;
+
+            TextExtents extents = text_extents_pool.Acquire();
+
+            RectangleF rect = block.Bounds;
+            // Work around Mono/GDI+ bug, which causes incorrect
+            // text wraping when block.Bounds == SizeF.Empty.
+            if (block.Bounds.Size == SizeF.Empty)
+                rect.Size = MaximumGraphicsClipSize;
+
+            SetTextRenderingOptions(graphics, block.Font, quality);
+
+            IntPtr native_graphics = GdiPlus.GetNativeGraphics(graphics);
+            IntPtr native_font = GdiPlus.GetNativeFont(block.Font);
+            IntPtr native_string_format = GdiPlus.GetNativeStringFormat(format);
+
+            float max_width = 0, max_height = 0;
+
+            // It seems that the mere presence of \n and \r characters
+            // is enough for Mono to botch the layout (even if these
+            // characters are not processed.) We'll need to find a
+            // different way to perform layout on Mono, probably
+            // through Pango.
+            // Todo: This workaround  allocates memory.
+            //if (Configuration.RunningOnMono)
+            {
+                string[] lines = block.Text.Replace("\r", String.Empty).Split('\n');
+                foreach (string s in lines)
+                {
+                    float width, height;
+
+                    extents.AddRange(MeasureGlyphExtents(
+                        ref block, s,
+                        native_graphics, native_font, native_string_format,
+                        ref rect, out width, out height));
+
+                    if ((block.Direction & TextDirection.Vertical) == 0)
+                        rect.Y += block.Font.Height;
+                    else
+                        rect.X += block.Font.Height;
+
+                    if (width > max_width)
+                        max_width = width;
+                    if (height > max_height)
+                        max_height = height;
+                }
+            }
+
+            if (extents.Count > 0)
+                extents.BoundingBox = new RectangleF(extents[0].X, extents[0].Y, max_width, max_height);
+            else
+                extents.BoundingBox = RectangleF.Empty;
+
+            return extents;
+        }
+
+        #endregion
+
+        #region MeasureGlyphExtents
+
+        // Gets the bounds of each character in a line of text.
+        // Each line is processed in blocks of 32 characters (GdiPlus.MaxMeasurableCharacterRanges).
+        IEnumerable<RectangleF> MeasureGlyphExtents(
+            ref TextBlock block, string text,
+            IntPtr native_graphics, IntPtr native_font, IntPtr native_string_format,
+            ref RectangleF layoutRect, out float max_width, out float max_height)
+        {
+            measured_glyphs.Clear();
+            max_width = layoutRect.Left;
+            max_height = layoutRect.Top;
+            float last_line_width = 0, last_line_height = 0;
+
+             int current = 0;
+             while (current < text.Length)
+             {
+                 int num_characters = (text.Length - current) > GdiPlus.MaxMeasurableCharacterRanges ?
+                     GdiPlus.MaxMeasurableCharacterRanges :
+                     text.Length - current;
+                 int status = 0;
+
+                 // Prepare the character ranges and region structs for the measurement.
+                 for (int i = 0; i < num_characters; i++)
+                 {
+                     if (text[current + i] == '\n' || text[current + i] == '\r')
+                         throw new NotSupportedException();
+
+                     characterRanges[i] = new CharacterRange(current + i, 1);
+
+                     IntPtr region;
+                     status = GdiPlus.CreateRegion(out region);
+                     regions[i] = region;
+                     Debug.Assert(status == 0, String.Format("GDI+ error: {0}", status));
+                 }
+
+                 status = GdiPlus.SetStringFormatMeasurableCharacterRanges(native_string_format, num_characters, characterRanges);
+                 Debug.Assert(status == 0, String.Format("GDI+ error: {0}", status));
+
+                 status = GdiPlus.MeasureCharacterRanges(native_graphics, text, text.Length,
+                                                 native_font, ref layoutRect, native_string_format, num_characters, regions);
+                 Debug.Assert(status == 0, String.Format("GDI+ error: {0}", status));
+
+                 // Read back the results of the measurement.
+                 for (int i = 0; i < num_characters; i++)
+                 {
+                     RectangleF rect = new RectangleF();
+
+                     GdiPlus.GetRegionBounds(regions[i], native_graphics, ref rect);
+                     Debug.Assert(status == 0, String.Format("GDI+ error: {0}", status));
+                     GdiPlus.DeleteRegion(regions[i]);
+                     Debug.Assert(status == 0, String.Format("GDI+ error: {0}", status));
+
+                     if (rect.Bottom > max_height)
+                         max_height = rect.Bottom;
+                     if (rect.Right > max_width)
+                         max_width = rect.Right;
+
+                     if (rect.X > last_line_width)
+                         last_line_width = rect.X;
+                     if (rect.Y > last_line_height)
+                         last_line_height = rect.Y;
+                     
+                     measured_glyphs.Add(rect);
+                 }
+
+                 current += num_characters;
+             }
+
+             // Make sure the current height is updated, if the the current line has wrapped due to word-wraping.
+             // Otherwise, the next line will overlap with the current one.
+             if (measured_glyphs.Count > 1)
+             {
+                 if ((block.Direction & TextDirection.Vertical) == 0)
+                 {
+                     if (layoutRect.Y < last_line_height)
+                         layoutRect.Y = last_line_height;
+                 }
+                 else
+                 {
+                     if (layoutRect.X < last_line_width)
+                         layoutRect.X = last_line_width;
+                 }
+             }
+
+            // Mono's GDI+ implementation suffers from an issue where the specified layoutRect is not taken into
+            // account. We will try to improve the situation by moving text to the correct location on this
+            // error condition. This will not help word wrapping, but it is better than nothing.
+            // Todo: Mono 2.8 is supposed to ship with a Pango-based GDI+ text renderer, which should not
+            // suffer from this bug. Verify that this is the case and remove the hack.
+            if (Configuration.RunningOnMono && (layoutRect.X != 0 || layoutRect.Y != 0) && measured_glyphs.Count > 0)
+            {
+                for (int i = 0; i < measured_glyphs.Count; i++)
+                {
+                    RectangleF rect = measured_glyphs[i];
+                    rect.X += layoutRect.X;
+                    rect.Y += layoutRect.Y;
+                    measured_glyphs[i] = rect;
+                }
+            }
+
+            return measured_glyphs;
+        }
+
+        #endregion
+
+        #region FindEdges
+
+        #pragma warning disable 0649
+
+        struct Pixel { public byte B, G, R, A; }
+
+        #pragma warning restore 0649
+
+        // Note: The bool parameter is not used at this point.
+        // We might need it if we ever load true rightToLeft glyphs.
+        Rectangle FindEdges(Bitmap bmp, bool rightToLeft)
+        {
+            BitmapData data = bmp.LockBits(
+                new Rectangle(0, 0, bmp.Width, bmp.Height),
+                ImageLockMode.ReadOnly,
+                System.Drawing.Imaging.PixelFormat.Format32bppArgb);
+
+            //Rectangle rect = rightToLeft ?
+            //    Rectangle.FromLTRB(FindLeftEdge(bmp, data.Scan0), 0, bmp.Width - 1, FindBottomEdge(bmp, data.Scan0)) :
+            //    Rectangle.FromLTRB(0, 0, FindRightEdge(bmp, data.Scan0), FindBottomEdge(bmp, data.Scan0));
+
+            Rectangle rect =
+                Rectangle.FromLTRB(0, 0, FindRightEdge(bmp, data.Scan0), FindBottomEdge(bmp, data.Scan0));
+               //Rectangle.FromLTRB(FindLeftEdge(bmp, data.Scan0), 0, FindRightEdge(bmp, data.Scan0), FindBottomEdge(bmp, data.Scan0));
+
+            bmp.UnlockBits(data);
+
+            return rect;
+        }
+
+        #endregion
+
+        #region Find[Left|Right|Top|Bottom]Edge
+
+        // Iterates through the bmp, and returns the first row or line that contains a non-transparent pixels.
+
+        int FindLeftEdge(Bitmap bmp, IntPtr ptr)
+        {
+            for (int x = 0; x < bmp.Width; x++)
+                for (int y = 0; y < bmp.Height; y++)
+                    unsafe
+                    {
+                        if (((Pixel*)(ptr) + y * bmp.Width + x)->A != 0)
+                            return x;
+                    }
+
+            return bmp.Width - 1;
+        }
+
+        int FindRightEdge(Bitmap bmp, IntPtr ptr)
+        {
+            for (int x = bmp.Width - 1; x >= 0; x--)
+                for (int y = 0; y < bmp.Height; y++)
+                    unsafe
+                    {
+                        if (((Pixel*)(ptr) + y * bmp.Width + x)->A != 0)
+                            return x + 1;
+                    }
+
+            return 0;
+        }
+
+        int FindTopEdge(Bitmap bmp, IntPtr ptr)
+        {
+            for (int y = 0; y < bmp.Height; y++)
+                for (int x = 0; x < bmp.Width; x++)
+                    unsafe
+                    {
+                        if (((Pixel*)(ptr) + y * bmp.Width + x)->A != 0)
+                            return y;
+                    }
+
+            return bmp.Height - 1;
+        }
+
+        int FindBottomEdge(Bitmap bmp, IntPtr ptr)
+        {
+            for (int y = bmp.Height - 1; y >= 0; y--)
+                for (int x = 0; x < bmp.Width; x++)
+                    unsafe
+                    {
+                        if (((Pixel*)(ptr) + y * bmp.Width + x)->A != 0)
+                            return y + 1;
+                    }
+
+            return 0;
+        }
+
+        #endregion
+
+        #endregion
+    }
+}

Source/Compatibility/Graphics/Text/Glyph.cs

@@ -0,0 +1,153 @@
+#region License
+//
+// The Open Toolkit Library License
+//
+// Copyright (c) 2006 - 2008 the Open Toolkit library, except where noted.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights to 
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do
+// so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+//
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Drawing;
+
+namespace OpenTK.Graphics.Text
+{
+    struct Glyph : IEquatable<Glyph>
+    {
+        char character;
+        Font font;
+
+        #region Constructors
+
+        /// <summary>
+        /// Constructs a new Glyph that represents the given character and Font.
+        /// </summary>
+        /// <param name="c">The character to represent.</param>
+        /// <param name="font">The Font of the character.</param>
+        public Glyph(char c, Font font)
+        {
+            if (font == null)
+                throw new ArgumentNullException("font");
+            character = c;
+            this.font = font;
+        }
+
+        #endregion
+
+        #region Public Methods 
+        
+        #region public char Character
+
+        /// <summary>
+        /// Gets the character represented by this Glyph.
+        /// </summary>
+        public char Character
+        {
+            get { return character; }
+            private set { character = value; }
+        }
+
+        #endregion
+
+        #region public Font Font
+
+        /// <summary>
+        ///  Gets the Font of this Glyph.
+        /// </summary>
+        public Font Font
+        {
+            get { return font; }
+            private set
+            {
+                if (value == null)
+                    throw new ArgumentNullException("Font", "Glyph font cannot be null");
+
+                font = value;
+            }
+        }
+
+        #endregion
+
+        #region public bool IsWhiteSpace
+
+        public bool IsWhiteSpace
+        {
+            get { return Char.IsWhiteSpace(Character); }
+        }
+
+        #endregion
+
+        #region public override bool Equals(object obj)
+
+        /// <summary>
+        /// Checks whether the given object is equal (memberwise) to the current Glyph.
+        /// </summary>
+        /// <param name="obj">The obj to check.</param>
+        /// <returns>True, if the object is identical to the current Glyph.</returns>
+        public override bool Equals(object obj)
+        {
+            if (obj is Glyph)
+                return this.Equals((Glyph)obj);
+            return base.Equals(obj);
+        }
+
+        #endregion
+
+        #region public override string ToString()
+
+        /// <summary>
+        /// Describes this Glyph object.
+        /// </summary>
+        /// <returns>Returns a System.String describing this Glyph.</returns>
+        public override string ToString()
+        {
+            return String.Format("'{0}', {1} {2}, {3} {4}", Character, Font.Name, font.Style, font.Size, font.Unit);
+        }
+
+        #endregion
+
+        #region public override int GetHashCode()
+
+        /// <summary>
+        /// Calculates the hashcode for this Glyph.
+        /// </summary>
+        /// <returns>A System.Int32 containing a hashcode that uniquely identifies this Glyph.</returns>
+        public override int GetHashCode()
+        {
+            return character.GetHashCode() ^ font.GetHashCode();
+        }
+
+        #endregion
+
+        #endregion
+
+        #region IEquatable<Glyph> Members
+
+        public bool Equals(Glyph other)
+        {
+            return Character == other.Character && Font == other.Font;
+        }
+
+        #endregion
+    }
+}

Source/Compatibility/Graphics/Text/GlyphCache.cs

@@ -0,0 +1,154 @@
+#region License
+//
+// The Open Toolkit Library License
+//
+// Copyright (c) 2006 - 2008 the Open Toolkit library, except where noted.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights to 
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do
+// so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+//
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+
+namespace OpenTK.Graphics.Text
+{
+    abstract class GlyphCache : IGlyphCache
+    {
+        #region IGlyphCache Members
+
+        public abstract void Add(Glyph glyph, IGlyphRasterizer rasterizer, TextQuality quality);
+
+        public abstract bool Contains(Glyph glyph);
+
+        public abstract CachedGlyphInfo this[Glyph glyph] { get; }
+
+        public abstract void Clear();
+
+        public abstract void Dispose();
+
+        #endregion
+    }
+
+    sealed class GlyphCache<T> : GlyphCache where T : Texture2D
+    {
+        #region Fields
+
+        List<GlyphSheet<T>> sheets = new List<GlyphSheet<T>>();
+
+        Dictionary<Glyph, CachedGlyphInfo> cached_glyphs = new Dictionary<Glyph, CachedGlyphInfo>();
+
+        bool disposed;
+
+        const int SheetWidth = 512, SheetHeight = 512;
+
+        #endregion
+
+        #region Constructors
+
+        public GlyphCache()
+        {
+            sheets.Add(new GlyphSheet<T>(SheetWidth, SheetHeight));
+        }
+
+        #endregion
+
+        #region IGlyphCache Members
+
+        public override void Add(Glyph glyph, IGlyphRasterizer rasterizer, TextQuality quality)
+        {
+            if (rasterizer == null)
+                throw new ArgumentNullException("rasterizer");
+
+            bool inserted = false;
+
+            using (Bitmap bmp = rasterizer.Rasterize(glyph, quality))
+            {
+                Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);
+                foreach (GlyphSheet<T> sheet in sheets)
+                {
+                     inserted = InsertGlyph(glyph, bmp, rect, sheet);
+                     if (inserted)
+                         break;
+                }
+
+                if (!inserted)
+                {
+                    GlyphSheet<T> sheet = new GlyphSheet<T>(SheetWidth, SheetHeight);
+                    sheets.Add(sheet);
+                    InsertGlyph(glyph, bmp, rect, sheet);
+                }
+            }
+        }
+
+        public override bool Contains(Glyph glyph)
+        {
+            return cached_glyphs.ContainsKey(glyph);
+        }
+
+        public override CachedGlyphInfo this[Glyph glyph]
+        {
+            get
+            {
+                return cached_glyphs[glyph];
+            }
+        }
+        public override void Clear()
+        {
+            for (int i = 0; i < sheets.Count; i++)
+                sheets[i].Dispose();
+
+            sheets.Clear();
+        }
+
+        #endregion
+
+        #region Private Members
+
+        // Asks the packer for an empty space and writes the glyph there.
+        bool InsertGlyph(Glyph glyph, Bitmap bmp, Rectangle source, GlyphSheet<T> sheet)
+        {
+            Rectangle target = new Rectangle();
+            if (!sheet.Packer.TryAdd(source, out target))
+                return false;
+
+            sheet.Texture.WriteRegion(source, target, 0, bmp);
+            cached_glyphs.Add(glyph, new CachedGlyphInfo(sheet.Texture, target));
+
+            return true;
+        }
+
+        #endregion
+
+        #region IDisposable Members
+
+        public override void Dispose()
+        {
+             if (!disposed)
+            {
+                Clear();
+                disposed = true;
+             }
+        }
+
+        #endregion
+    }
+}

Source/Compatibility/Graphics/Text/GlyphEnumerator.cs

@@ -0,0 +1,107 @@
+#region License
+//
+// The Open Toolkit Library License
+//
+// Copyright (c) 2006 - 2008 the Open Toolkit library, except where noted.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights to 
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do
+// so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+//
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Drawing;
+
+namespace OpenTK.Graphics.Text
+{
+    class GlyphEnumerator : IEnumerator<Glyph>
+    {
+        #region Fields
+
+        string text;
+        Font font;
+
+        IEnumerator<char> implementation;
+
+        #endregion
+
+        #region Constructors
+
+        public GlyphEnumerator(string text, Font font)
+        {
+            if (text == null)
+                throw new ArgumentNullException("text");
+
+            if (font == null)
+                throw new ArgumentNullException("font");
+
+            this.text = text;
+            this.font = font;
+
+            implementation = text.GetEnumerator();
+        }
+
+        #endregion
+        
+        #region IEnumerator<Glyph> Members
+
+        public Glyph Current
+        {
+            get { return new Glyph(implementation.Current, font); }
+        }
+
+        #endregion
+
+        #region IDisposable Members
+
+        public void Dispose()
+        {
+            implementation.Dispose();
+        }
+
+        #endregion
+
+        #region IEnumerator Members
+
+        object System.Collections.IEnumerator.Current
+        {
+            get { return new Glyph(implementation.Current, font); }
+        }
+
+        public bool MoveNext()
+        {
+            bool status;
+            do
+            {
+                status = implementation.MoveNext();
+            } while (status && (implementation.Current == '\n' || implementation.Current == '\r'));
+
+            return status;
+        }
+
+        public void Reset()
+        {
+            implementation.Reset();
+        }
+
+        #endregion
+    }
+}

Source/Compatibility/Graphics/Text/GlyphPacker.cs

@@ -0,0 +1,270 @@
+#region License
+//
+// The Open Toolkit Library License
+//
+// Copyright (c) 2006 - 2008 the Open Toolkit library, except where noted.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights to 
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do
+// so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+//
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Drawing;
+
+namespace OpenTK.Graphics.Text
+{
+    class GlyphPacker
+    {
+        Node root;
+
+        #region --- Constructors ---
+
+        public GlyphPacker(int width, int height)
+        {
+            if (width <= 0)
+                throw new ArgumentOutOfRangeException("width", width, "Must be greater than zero.");
+            if (height <= 0)
+                throw new ArgumentOutOfRangeException("height", height, "Must be greater than zero.");
+
+            root = new Node();
+            root.Rectangle = new Rectangle(0, 0, width, width);
+        }
+
+        #endregion
+
+        #region --- Public Methods ---
+
+        #region public bool TryAdd(Rectangle boundingBox)
+
+        /// <summary>
+        /// Adds boundingBox to the GlyphPacker.
+        /// </summary>
+        /// <param name="boundingBox">The bounding box of the item to pack.</param>
+        /// <param name="packedRectangle">The System.Drawing.Rectangle that contains the position of the packed item.</param>
+        /// <returns>True, if the item was successfully packed; false if the item is too big for this packer..</returns>
+        /// <exception cref="InvalidOperationException">Occurs if the item is larger than the available TexturePacker area</exception>
+        /// <exception cref="TexturePackerFullException">Occurs if the item cannot fit in the remaining packer space.</exception>
+        public bool TryAdd(Rectangle boundingBox, out Rectangle packedRectangle)
+        {
+            if (!root.Rectangle.Contains(boundingBox))
+            {
+                packedRectangle = new Rectangle();
+                return false;
+            }
+
+            // Increase size so that the glyphs do not touch each other (to avoid rendering artifacts).
+            boundingBox.Width += 2;
+            boundingBox.Height += 2;
+
+            Node node = root.Insert(boundingBox);
+
+            // Tree is full and insertion failed:
+            if (node == null)
+            {
+                packedRectangle = new Rectangle();
+                return false;
+            }
+
+            packedRectangle = new Rectangle(node.Rectangle.X, node.Rectangle.Y, node.Rectangle.Width - 2, node.Rectangle.Height - 2);
+            return true;
+        }
+
+        #endregion
+
+        #region public Rectangle TryAdd(RectangleF boundingBox)
+
+        /// <summary>
+        /// Adds boundingBox to the GlyphPacker.
+        /// </summary>
+        /// <param name="boundingBox">The bounding box of the item to pack.</param>
+        /// <param name="packedRectangle">The System.Drawing.RectangleF that contains the position of the packed item.</param>
+        /// <returns>True, if the item was successfully packed; false if the item is too big for this packer..</returns>
+        /// <exception cref="InvalidOperationException">Occurs if the item is larger than the available TexturePacker area</exception>
+        /// <exception cref="TexturePackerFullException">Occurs if the item cannot fit in the remaining packer space.</exception>
+        public bool TryAdd(RectangleF boundingBox, out RectangleF packedRectangle)
+        {
+            Rectangle bbox = new Rectangle(
+                (int)boundingBox.X, (int)boundingBox.Y,
+                (int)(boundingBox.Width + 0.5f), (int)(boundingBox.Height + 0.5f));
+
+            return TryAdd(bbox, out packedRectangle);
+        }
+
+        #endregion
+
+        #region public Rectangle Add(Rectangle boundingBox)
+
+        /// <summary>
+        /// Adds boundingBox to the GlyphPacker.
+        /// </summary>
+        /// <param name="boundingBox">The bounding box of the item to pack.</param>
+        /// <returns>A System.Drawing.Rectangle containing the coordinates of the packed item.</returns>
+        /// <exception cref="InvalidOperationException">Occurs if the item is larger than the available TexturePacker area</exception>
+        /// <exception cref="TexturePackerFullException">Occurs if the item cannot fit in the remaining packer space.</exception>
+        public Rectangle Add(Rectangle boundingBox)
+        {
+            if (!TryAdd(boundingBox, out boundingBox))
+                throw new TexturePackerFullException();
+
+            return boundingBox;
+        }
+
+        #endregion
+
+        #region public Rectangle Add(RectangleF boundingBox)
+
+        /// <summary>
+        /// Rounds boundingBox to the largest integer and adds the resulting Rectangle to the GlyphPacker.
+        /// </summary>
+        /// <param name="boundingBox">The bounding box of the item to pack.</param>
+        /// <returns>A System.Drawing.Rectangle containing the coordinates of the packed item.</returns>
+        /// <exception cref="InvalidOperationException">Occurs if the item is larger than the available TexturePacker area</exception>
+        /// <exception cref="ArgumentException">Occurs if the item already exists in the TexturePacker.</exception>
+        public Rectangle Add(RectangleF boundingBox)
+        {
+            Rectangle bbox = new Rectangle(
+                (int)boundingBox.X, (int)boundingBox.Y,
+                (int)(boundingBox.Width + 0.5f), (int)(boundingBox.Height + 0.5f));
+
+            return Add(bbox);
+        }
+
+        #endregion
+
+        #region public void Clear()
+
+        /// <summary>
+        /// Discards all packed items.
+        /// </summary>
+        public void Clear()
+        {
+            root.Clear();
+        }
+
+        #endregion
+
+        #endregion
+
+        #region Node
+
+        class Node
+        {
+            public Node()
+            {
+            }
+
+            Node left, right;
+            Rectangle rect;
+            bool occupied;
+
+            public Rectangle Rectangle { get { return rect; } set { rect = value; } }
+            public Node Left { get { return left; } set { left = value; } }
+            public Node Right { get { return right; } set { right = value; } }
+
+            #region --- Constructor ---
+
+            public bool Leaf
+            {
+                get { return left == null && right == null; }
+            }
+
+            #endregion
+
+            #region Node Insert(Rectangle bbox)
+
+            public Node Insert( Rectangle bbox)
+            {
+                if (!this.Leaf)
+                {
+                    // Recurse towards left child, and if that fails, towards the right.
+                    Node new_node = left.Insert(bbox);
+                    return new_node ?? right.Insert(bbox);
+                }
+                else
+                {
+                    // We have recursed to a leaf.
+
+                    // If it is not empty go back.
+                    if (occupied)
+                        return null;
+
+                    // If this leaf is too small go back.
+                    if (rect.Width < bbox.Width || rect.Height < bbox.Height)
+                        return null;
+
+                    // If this leaf is the right size, insert here.
+                    if (rect.Width == bbox.Width && rect.Height == bbox.Height)
+                    {
+                        occupied = true;
+                        return this;
+                    }
+
+                    // This leaf is too large, split it up. We'll decide which way to split
+                    // by checking the width and height difference between this rectangle and
+                    // out item's bounding box. If the width difference is larger, we'll split
+                    // horizontaly, else verticaly.
+                    left = new Node();
+                    right = new Node();
+
+                    int dw = this.rect.Width - bbox.Width + 1;
+                    int dh = this.rect.Height - bbox.Height + 1;
+
+                    if (dw > dh)
+                    {
+                        left.rect = new Rectangle(rect.Left, rect.Top, bbox.Width, rect.Height);
+                        right.rect = new Rectangle(rect.Left + bbox.Width, rect.Top, rect.Width - bbox.Width, rect.Height);
+                    }
+                    else
+                    {
+                        left.rect = new Rectangle(rect.Left, rect.Top, rect.Width, bbox.Height);
+                        right.rect = new Rectangle(rect.Left, rect.Top + bbox.Height, rect.Width, rect.Height - bbox.Height);
+                    }
+
+                    return left.Insert(bbox);
+                }
+            }
+
+            #endregion
+
+            #region public void Clear()
+            
+            public void Clear()
+            {
+                if (left != null)
+                    left.Clear();
+                if (right != null)
+                    right.Clear();
+
+                left = right = null;
+            }
+
+            #endregion
+        }
+
+        #endregion
+    }
+
+    class TexturePackerFullException : Exception
+    {
+        public TexturePackerFullException() : base("There is not enough space to add this item. Consider calling the Clear() method.") { }
+    }
+}

Source/Compatibility/Graphics/Text/GlyphSheet.cs

@@ -0,0 +1,85 @@
+#region License
+//
+// The Open Toolkit Library License
+//
+// Copyright (c) 2006 - 2008 the Open Toolkit library, except where noted.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights to 
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do
+// so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+//
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Drawing;
+
+namespace OpenTK.Graphics.Text
+{
+    class GlyphSheet<T> : IDisposable where T : Texture2D
+    {
+        #region Fields
+
+        readonly T texture;
+        readonly GlyphPacker packer;
+
+        bool disposed;
+
+        #endregion
+
+        #region Constructors
+
+        public GlyphSheet(int width, int height)
+        {
+            texture = (T)typeof(T).GetConstructor(new Type[] { typeof(int), typeof(int) }).Invoke(new object[] { width, height });
+            //texture.MagnificationFilter = TextureMagFilter.Nearest;
+            //texture.MinificationFilter = TextureMinFilter.Nearest;
+            packer = new GlyphPacker(width, height);
+        }
+
+        #endregion
+
+        #region Public Members
+
+        public T Texture
+        {
+            get { return texture; }
+        }
+
+        public GlyphPacker Packer
+        {
+            get { return packer; }
+        }
+
+        #endregion
+
+        #region IDisposable Members
+
+        public void Dispose()
+        {
+            if (!disposed)
+            {
+                texture.Dispose();
+                disposed = true;
+            }
+        }
+
+        #endregion
+    }
+}

Source/Compatibility/Graphics/Text/IGlyphCache.cs

@@ -0,0 +1,39 @@
+#region License
+//
+// The Open Toolkit Library License
+//
+// Copyright (c) 2006 - 2008 the Open Toolkit library, except where noted.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights to 
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do
+// so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+//
+#endregion
+
+using System;
+
+namespace OpenTK.Graphics.Text
+{
+    interface IGlyphCache : IDisposable
+    {
+        void Add(Glyph glyph, IGlyphRasterizer rasterizer, TextQuality quality);
+        bool Contains(Glyph glyph);
+        CachedGlyphInfo this[Glyph glyph] { get; }
+        void Clear();
+    }
+}

Source/Compatibility/Graphics/Text/IGlyphRasterizer.cs

@@ -0,0 +1,45 @@
+#region License
+//
+// The Open Toolkit Library License
+//
+// Copyright (c) 2006 - 2008 the Open Toolkit library, except where noted.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights to 
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do
+// so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+//
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Drawing;
+
+using OpenTK.Graphics.Text;
+
+namespace OpenTK.Graphics.Text
+{
+    interface IGlyphRasterizer
+    {
+        Bitmap Rasterize(Glyph glyph);
+        Bitmap Rasterize(Glyph glyph, TextQuality quality);
+        TextExtents MeasureText(ref TextBlock block);
+        TextExtents MeasureText(ref TextBlock block, TextQuality quality);
+        void Clear();
+    }
+}

Source/Compatibility/Graphics/Text/ITextOutputProvider.cs

@@ -0,0 +1,42 @@
+#region License
+//
+// The Open Toolkit Library License
+//
+// Copyright (c) 2006 - 2008 the Open Toolkit library, except where noted.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights to 
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do
+// so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+//
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Drawing;
+
+namespace OpenTK.Graphics.Text
+{
+    interface ITextOutputProvider : IDisposable
+    {
+        void Print(ref TextBlock block, Color color, IGlyphRasterizer rasterizer);
+        void Clear();
+        void Begin();
+        void End();
+    }
+}

Source/Compatibility/Graphics/Text/PoolableTextExtents.cs

@@ -0,0 +1,42 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace OpenTK.Graphics.Text
+{
+    class PoolableTextExtents : TextExtents, IPoolable<PoolableTextExtents>
+    {
+        ObjectPool<PoolableTextExtents> owner;
+
+        #region Constructors
+
+        public PoolableTextExtents()
+        {
+        }
+
+        #endregion
+
+        #region IPoolable<PoolableTextExtents> Members
+
+        ObjectPool<PoolableTextExtents> IPoolable<PoolableTextExtents>.Owner
+        {
+            get { return owner; }
+            set { owner = value; }
+        }
+
+        #endregion
+
+        #region IPoolable Members
+
+        void IPoolable.OnAcquire()
+        {
+            Clear();
+        }
+
+        void IPoolable.OnRelease()
+        {
+        }
+
+        #endregion
+    }
+}

Source/Compatibility/Graphics/Text/TextBlock.cs

@@ -0,0 +1,124 @@
+#region License
+//
+// The Open Toolkit Library License
+//
+// Copyright (c) 2006 - 2008 the Open Toolkit library, except where noted.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights to 
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do
+// so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+//
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Drawing;
+
+namespace OpenTK.Graphics.Text
+{
+    // Uniquely identifies a block of text. This structure can be used to identify text blocks for caching.
+    struct TextBlock : IEquatable<TextBlock>, IEnumerable<Glyph>
+    {
+        #region Fields
+
+        public readonly string Text;
+
+        public readonly Font Font;
+
+        public readonly RectangleF Bounds;
+
+        public readonly TextPrinterOptions Options;
+
+        public readonly TextAlignment Alignment;
+
+        public readonly TextDirection Direction;
+
+        public readonly int UsageCount;
+
+        #endregion
+
+        #region Constructors
+
+        public TextBlock(string text, Font font, RectangleF bounds, TextPrinterOptions options, TextAlignment alignment, TextDirection direction)
+        {
+            Text = text;
+            Font = font;
+            Bounds = bounds;
+            Options = options;
+            Alignment = alignment;
+            Direction = direction;
+            UsageCount = 0;
+        }
+
+        #endregion
+
+        #region Public Members
+
+        public override bool Equals(object obj)
+        {
+            if (!(obj is TextBlock))
+                return false;
+
+            return Equals((TextBlock)obj);
+        }
+
+        public override int GetHashCode()
+        {
+            return Text.GetHashCode() ^ Font.GetHashCode() ^ Bounds.GetHashCode() ^ Options.GetHashCode();
+        }
+
+        public Glyph this[int i]
+        {
+            get { return new Glyph(Text[i], Font); }
+        }
+
+        #endregion
+
+        #region IEquatable<TextBlock> Members
+
+        public bool Equals(TextBlock other)
+        {
+            return
+                Text == other.Text &&
+                Font == other.Font &&
+                Bounds == other.Bounds &&
+                Options == other.Options;
+        }
+
+        #endregion
+
+        #region IEnumerable<Glyph> Members
+
+        public IEnumerator<Glyph> GetEnumerator()
+        {
+            return new GlyphEnumerator(Text, Font);
+        }
+
+        #endregion
+
+        #region IEnumerable Members
+
+        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
+        {
+            return new GlyphEnumerator(Text, Font);
+        }
+
+        #endregion
+    }
+}

Source/Compatibility/Graphics/Text/TextBlockComparer.cs

@@ -0,0 +1,51 @@
+#region License
+//
+// The Open Toolkit Library License
+//
+// Copyright (c) 2006 - 2008 the Open Toolkit library, except where noted.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights to 
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do
+// so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+//
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace OpenTK.Graphics.Text
+{
+    class TextBlockComparer : IComparer<TextBlock>
+    {
+        #region Constructors
+
+        public TextBlockComparer() { }
+
+        #endregion
+
+        #region IComparer<TextBlock> Members
+
+        public int Compare(TextBlock x, TextBlock y)
+        {
+            return x.UsageCount.CompareTo(y.UsageCount);
+        }
+
+        #endregion
+    }
+}

Source/Compatibility/Graphics/TextAlignment.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace OpenTK.Graphics
+{
+    /// <summary>
+    /// Defines available alignments for text.
+    /// </summary>
+    public enum TextAlignment
+    {
+        /// <summary>The text is aligned to the near side (left for left-to-right text and right for right-to-left text).</summary>
+        Near = 0,
+        /// <summary>The text is aligned to the center.</summary>
+        Center,
+        /// <summary>The text is aligned to the far side (right for left-to-right text and left for right-to-left text).</summary>
+        Far
+    }
+}

Source/Compatibility/Graphics/TextDirection.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace OpenTK.Graphics
+{
+    /// <summary>
+    /// Defines available directions for text layout.
+    /// </summary>
+    public enum TextDirection
+    {
+        /// <summary>The text is layed out from left to right.</summary>
+        LeftToRight,
+        /// <summary>The text is layed out from right to left.</summary>
+        RightToLeft,
+        /// <summary>The text is layed out vertically.</summary>
+        Vertical
+    }
+}

Source/Compatibility/Graphics/TextExtents.cs

@@ -0,0 +1,136 @@
+#region License
+//
+// The Open Toolkit Library License
+//
+// Copyright (c) 2006 - 2008 the Open Toolkit library, except where noted.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights to 
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do
+// so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+//
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Drawing;
+
+namespace OpenTK.Graphics
+{
+    /// <summary>
+    /// Holds the results of a text measurement.
+    /// </summary>
+    public class TextExtents : IDisposable
+    {
+        #region Fields
+
+        protected RectangleF text_extents;
+        protected List<RectangleF> glyph_extents = new List<RectangleF>();
+
+        public static readonly TextExtents Empty = new TextExtents();
+
+        #endregion
+
+        #region Constructors
+
+        internal TextExtents()
+        {
+        }
+
+        #endregion
+
+        #region Public Members
+
+        /// <summary>
+        /// Gets the bounding box of the measured text.
+        /// </summary>
+        public RectangleF BoundingBox
+        {
+            get { return text_extents; }
+            internal set { text_extents = value; }
+        }
+
+        /// <summary>
+        /// Gets the extents of each glyph in the measured text.
+        /// </summary>
+        /// <param name="i">The index of the glyph.</param>
+        /// <returns>The extents of the specified glyph.</returns>
+        public RectangleF this[int i]
+        {
+            get { return glyph_extents[i]; }
+            internal set { glyph_extents[i] = value; }
+        }
+
+        /// <summary>
+        /// Gets the extents of each glyph in the measured text.
+        /// </summary>
+        public IEnumerable<RectangleF> GlyphExtents
+        {
+            get { return (IEnumerable<RectangleF>)glyph_extents; }
+        }
+
+        /// <summary>
+        /// Gets the number of the measured glyphs.
+        /// </summary>
+        public int Count
+        {
+            get { return glyph_extents.Count; }
+        }
+
+        #endregion
+
+        #region Internal Members
+
+        internal void Add(RectangleF glyphExtent)
+        {
+            glyph_extents.Add(glyphExtent);
+        }
+
+        internal void AddRange(IEnumerable<RectangleF> glyphExtents)
+        {
+            glyph_extents.AddRange(glyphExtents);
+        }
+
+        internal void Clear()
+        {
+            BoundingBox = RectangleF.Empty;
+            glyph_extents.Clear();
+        }
+
+        internal TextExtents Clone()
+        {
+            TextExtents extents = new TextExtents();
+            extents.glyph_extents.AddRange(GlyphExtents);
+            extents.BoundingBox = BoundingBox;
+            return extents;
+        }
+
+        #endregion
+
+        #region IDisposable Members
+
+        /// <summary>
+        /// Frees the resources consumed by this TextExtents instance.
+        /// </summary>
+        public virtual void Dispose()
+        {
+        }
+
+        #endregion
+    }
+}

Source/Compatibility/Graphics/TextPrinter.cs

@@ -0,0 +1,338 @@
+#region --- License ---
+/* Licensed under the MIT/X11 license.
+ * Copyright (c) 2006-2008 the OpenTK Team.
+ * This notice may not be removed from any source distribution.
+ * See license.txt for licensing details.
+ */
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Drawing;
+using System.Text.RegularExpressions;
+using System.Runtime.InteropServices;
+using System.Diagnostics;
+
+using OpenTK.Graphics;
+using OpenTK.Graphics.Text;
+using OpenTK.Platform;
+
+namespace OpenTK.Fonts { }
+
+namespace OpenTK.Graphics
+{
+    /// <summary>
+    /// Provides methods to perform layout and print hardware accelerated text.
+    /// </summary>
+    public sealed class TextPrinter : ITextPrinter
+    {
+        #region Fields
+
+        IGlyphRasterizer glyph_rasterizer;
+        ITextOutputProvider text_output;
+        TextQuality text_quality;
+
+        bool disposed;
+
+        #endregion
+
+        #region Constructors
+
+        /// <summary>
+        /// Constructs a new TextPrinter instance.
+        /// </summary>
+        public TextPrinter()
+            : this(null, null, TextQuality.Default) { }
+
+        /// <summary>
+        /// Constructs a new TextPrinter instance with the specified TextQuality level.
+        /// </summary>
+        /// <param name="quality">The desired TextQuality of this TextPrinter.</param>
+        public TextPrinter(TextQuality quality)
+            : this(null, null, quality) { }
+
+        TextPrinter(IGlyphRasterizer rasterizer, ITextOutputProvider output, TextQuality quality)
+        {
+            glyph_rasterizer = rasterizer;
+            text_output = output;
+            text_quality = quality;
+        }
+
+        #endregion
+
+        #region ITextPrinter Members
+
+        #region Print
+
+        /// <summary>
+        /// Prints text using the specified color and layout options.
+        /// </summary>
+        /// <param name="text">The System.String to print.</param>
+        /// <param name="font">The System.Drawing.Font that will be used to print text.</param>
+        /// <param name="color">The System.Drawing.Color that will be used to print text.</param>
+        public void Print(string text, Font font, Color color)
+        {
+            Print(text, font, color, RectangleF.Empty, TextPrinterOptions.Default, TextAlignment.Near, TextDirection.LeftToRight);
+        }
+
+        /// <summary>
+        /// Prints text using the specified color and layout options.
+        /// </summary>
+        /// <param name="text">The System.String to print.</param>
+        /// <param name="font">The System.Drawing.Font that will be used to print text.</param>
+        /// <param name="color">The System.Drawing.Color that will be used to print text.</param>
+        /// <param name="rect">The System.Drawing.Rectangle that defines the bounds for text layout.</param>
+        public void Print(string text, Font font, Color color, RectangleF rect)
+        {
+            Print(text, font, color, rect, TextPrinterOptions.Default, TextAlignment.Near, TextDirection.LeftToRight);
+        }
+
+        /// <summary>
+        /// Prints text using the specified color and layout options.
+        /// </summary>
+        /// <param name="text">The System.String to print.</param>
+        /// <param name="font">The System.Drawing.Font that will be used to print text.</param>
+        /// <param name="color">The System.Drawing.Color that will be used to print text.</param>
+        /// <param name="rect">The System.Drawing.Rectangle that defines the bounds for text layout.</param>
+        /// <param name="options">The OpenTK.Graphics.TextPrinterOptions that will be used to print text.</param>
+        public void Print(string text, Font font, Color color, RectangleF rect, TextPrinterOptions options)
+        {
+            Print(text, font, color, rect, options, TextAlignment.Near, TextDirection.LeftToRight);
+        }
+
+        /// <summary>
+        /// Prints text using the specified color and layout options.
+        /// </summary>
+        /// <param name="text">The System.String to print.</param>
+        /// <param name="font">The System.Drawing.Font that will be used to print text.</param>
+        /// <param name="color">The System.Drawing.Color that will be used to print text.</param>
+        /// <param name="rect">The System.Drawing.Rectangle that defines the bounds for text layout.</param>
+        /// <param name="options">The OpenTK.Graphics.TextPrinterOptions that will be used to print text.</param>
+        /// <param name="alignment">The OpenTK.Graphics.TextAlignment that will be used to print text.</param>
+        public void Print(string text, Font font, Color color, RectangleF rect, TextPrinterOptions options, TextAlignment alignment)
+        {
+            Print(text, font, color, rect, options, alignment, TextDirection.LeftToRight);
+        }
+
+        /// <summary>
+        /// Prints text using the specified color and layout options.
+        /// </summary>
+        /// <param name="text">The System.String to print.</param>
+        /// <param name="font">The System.Drawing.Font that will be used to print text.</param>
+        /// <param name="color">The System.Drawing.Color that will be used to print text.</param>
+        /// <param name="rect">The System.Drawing.Rectangle that defines the bounds for text layout.</param>
+        /// <param name="options">The OpenTK.Graphics.TextPrinterOptions that will be used to print text.</param>
+        /// <param name="alignment">The OpenTK.Graphics.TextAlignment that will be used to print text.</param>
+        /// <param name="direction">The OpenTK.Graphics.TextDirection that will be used to print text.</param>
+        public void Print(string text, Font font, Color color, RectangleF rect, TextPrinterOptions options, TextAlignment alignment, TextDirection direction)
+        {
+            if (disposed)
+                throw new ObjectDisposedException(this.GetType().ToString());
+
+            if (!ValidateParameters(text, font, rect))
+                return;
+
+            TextBlock block = new TextBlock(text, font, rect, options, alignment, direction);
+            TextOutput.Print(ref block, color, Rasterizer);
+        }
+
+        #endregion
+
+        #region Measure
+
+        /// <summary>
+        /// Measures text using the specified layout options.
+        /// </summary>
+        /// <param name="text">The System.String to measure.</param>
+        /// <param name="font">The System.Drawing.Font that will be used to measure text.</param>
+        /// <returns>An OpenTK.Graphics.TextExtents instance that contains the results of the measurement.</returns>
+        public TextExtents Measure(string text, Font font)
+        {
+            return Measure(text, font, RectangleF.Empty, TextPrinterOptions.Default, TextAlignment.Near, TextDirection.LeftToRight);
+        }
+
+        /// <summary>
+        /// Measures text using the specified layout options.
+        /// </summary>
+        /// <param name="text">The System.String to measure.</param>
+        /// <param name="font">The System.Drawing.Font that will be used to measure text.</param>
+        /// <param name="rect">The System.Drawing.Rectangle that defines the bounds for text layout.</param>
+        /// <returns>An OpenTK.Graphics.TextExtents instance that contains the results of the measurement.</returns>
+        public TextExtents Measure(string text, Font font, RectangleF rect)
+        {
+            return Measure(text, font, rect, TextPrinterOptions.Default, TextAlignment.Near, TextDirection.LeftToRight);
+        }
+
+        /// <summary>
+        /// Measures text using the specified layout options.
+        /// </summary>
+        /// <param name="text">The System.String to measure.</param>
+        /// <param name="font">The System.Drawing.Font that will be used to measure text.</param>
+        /// <param name="rect">The System.Drawing.Rectangle that defines the bounds for text layout.</param>
+        /// <param name="options">The OpenTK.Graphics.TextPrinterOptions that will be used to measure text.</param>
+        /// <returns>An OpenTK.Graphics.TextExtents instance that contains the results of the measurement.</returns>
+        public TextExtents Measure(string text, Font font, RectangleF rect, TextPrinterOptions options)
+        {
+            return Measure(text, font, rect, options, TextAlignment.Near, TextDirection.LeftToRight);
+        }
+
+        /// <summary>
+        /// Measures text using the specified layout options.
+        /// </summary>
+        /// <param name="text">The System.String to measure.</param>
+        /// <param name="font">The System.Drawing.Font that will be used to measure text.</param>
+        /// <param name="rect">The System.Drawing.Rectangle that defines the bounds for text layout.</param>
+        /// <param name="options">The OpenTK.Graphics.TextPrinterOptions that will be used to measure text.</param>
+        /// <param name="alignment">The OpenTK.Graphics.TextAlignment that will be used to measure text.</param>
+        /// <returns>An OpenTK.Graphics.TextExtents instance that contains the results of the measurement.</returns>
+        public TextExtents Measure(string text, Font font, RectangleF rect, TextPrinterOptions options, TextAlignment alignment)
+        {
+            return Measure(text, font, rect, options, alignment, TextDirection.LeftToRight);
+        }
+
+        /// <summary>
+        /// Measures text using the specified layout options.
+        /// </summary>
+        /// <param name="text">The System.String to measure.</param>
+        /// <param name="font">The System.Drawing.Font that will be used to measure text.</param>
+        /// <param name="rect">The System.Drawing.Rectangle that defines the bounds for text layout.</param>
+        /// <param name="options">The OpenTK.Graphics.TextPrinterOptions that will be used to measure text.</param>
+        /// <param name="alignment">The OpenTK.Graphics.TextAlignment that will be used to measure text.</param>
+        /// <param name="direction">The OpenTK.Graphics.TextDirection that will be used to measure text.</param>
+        /// <returns>An OpenTK.Graphics.TextExtents instance that contains the results of the measurement.</returns>
+        public TextExtents Measure(string text, Font font, RectangleF rect, TextPrinterOptions options, TextAlignment alignment, TextDirection direction)
+        {
+            if (disposed)
+                throw new ObjectDisposedException(this.GetType().ToString());
+
+            if (!ValidateParameters(text, font, rect))
+                return TextExtents.Empty;
+
+            TextBlock block = new TextBlock(text, font, rect, options, alignment, direction);
+            return Rasterizer.MeasureText(ref block);
+        }
+
+        #endregion
+
+        #region Clear
+
+        public void Clear()
+        {
+            if (disposed)
+                throw new ObjectDisposedException(this.GetType().ToString());
+
+            TextOutput.Clear();
+            Rasterizer.Clear();
+        }
+
+        #endregion
+
+        #region Begin
+
+        /// <summary>
+        /// Sets up a resolution-dependent orthographic projection.
+        /// </summary>
+        public void Begin()
+        {
+            TextOutput.Begin();
+        }
+
+        #endregion
+
+        #region Begin
+
+        /// <summary>
+        /// Restores the projection and modelview matrices to their previous state.
+        /// </summary>
+        public void End()
+        {
+            TextOutput.End();
+        }
+
+        #endregion
+
+        #region Obsolete
+
+        [Obsolete("Use TextPrinter.Print instead")]
+        public void Draw(TextHandle handle)
+        {
+            Print(handle.Text, handle.GdiPFont, Color.White);
+        }
+
+        [Obsolete("Use TextPrinter.Print instead")]
+        public void Draw(string text, TextureFont font)
+        {
+            Print(text, font.font, Color.White);
+        }
+
+        [Obsolete("Use TextPrinter.Print instead")]
+        public void Prepare(string text, TextureFont font, out TextHandle handle)
+        {
+            handle = new TextHandle(text, font.font);
+        }
+
+        #endregion
+
+        #endregion
+
+        #region Private Members
+
+        IGlyphRasterizer Rasterizer
+        {
+            get
+            {
+                if (glyph_rasterizer == null)
+                    glyph_rasterizer = new GdiPlusGlyphRasterizer();
+
+                return glyph_rasterizer;
+            }
+
+        }
+
+        ITextOutputProvider TextOutput
+        {
+            get
+            {
+                if (text_output == null)
+                    text_output = GL1TextOutputProvider.Create(text_quality);
+
+                return text_output;
+            }
+        }
+
+        #endregion
+
+        #region Static Members
+
+        static bool ValidateParameters(string text, Font font, RectangleF rect)
+        {
+            if (String.IsNullOrEmpty(text))
+                return false;
+            if (font == null)
+                throw new ArgumentNullException("font");
+            if (rect.Width < 0 || rect.Height < 0)
+                throw new ArgumentOutOfRangeException("rect");
+
+            return true;
+        }
+
+        #endregion
+
+        #region IDisposable Members
+
+        /// <summary>
+        /// Frees the resources consumed by this TextPrinter object.
+        /// </summary>
+        public void Dispose()
+        {
+            if (!disposed)
+            {
+                TextOutput.Dispose();
+                disposed = true;
+            }
+        }
+
+        #endregion
+    }
+}

Source/Compatibility/Graphics/TextPrinterOptions.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace OpenTK.Graphics
+{
+    /// <summary>
+    /// Defines available options for the TextPrinter.
+    /// </summary>
+    [Flags]
+    public enum TextPrinterOptions
+    {
+        /// <summary>The TextPrinter will use default printing options.</summary>
+        Default = 0x0000,
+        /// <summary>The TextPrinter will not cache text blocks as they are measured or printed.</summary>
+        NoCache = 0x0001,
+    }
+}

Source/Compatibility/Graphics/TextQuality.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace OpenTK.Graphics
+{
+    /// <summary>
+    /// Defines available quality levels for text printing.
+    /// </summary>
+    public enum TextQuality
+    {
+        /// <summary>Use the default quality, as specified by the operating system.</summary>
+        Default = 0,
+        /// <summary>Use fast, low quality text (typically non-antialiased) .</summary>
+        Low,
+        /// <summary>Use medium quality text (typically grayscale antialiased).</summary>
+        Medium,
+        /// <summary>Use slow, high quality text (typically subpixel antialiased).</summary>
+        High
+    }
+}

Source/Compatibility/Graphics/Texture2D.cs

@@ -0,0 +1,320 @@
+#region License
+//
+// The Open Toolkit Library License
+//
+// Copyright (c) 2006 - 2008 the Open Toolkit library, except where noted.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights to 
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do
+// so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+//
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Drawing;
+using System.Drawing.Imaging;
+using System.Diagnostics;
+
+namespace OpenTK.Graphics
+{
+    abstract class Texture2D :  IGraphicsResource, IEquatable<Texture2D>
+    {
+        #region Fields
+
+        IGraphicsContext context;
+        int id;
+        int width, height;
+        bool disposed;
+
+        TextureMagFilter mag_filter = TextureMagFilter.Linear;
+        TextureMinFilter min_filter = TextureMinFilter.Linear;
+
+        #endregion
+
+        #region Constructors
+
+        public Texture2D(int width, int height)
+        {
+            if (width <= 0)
+                throw new ArgumentOutOfRangeException("width");
+
+            if (height <= 0)
+                throw new ArgumentOutOfRangeException("height");
+
+            Width = width;
+            Height = height;
+        }
+
+        #endregion
+
+        #region Public Members
+
+        #region public int Width
+
+        /// <summary>Gets the width of the texture.</summary>
+        public int Width { get { return width; } private set { width = value; } }
+
+        #endregion
+
+        #region public int Height
+
+        /// <summary>Gets the height of the texture.</summary>
+        public int Height { get { return height; } private set { height = value; } }
+
+        #endregion
+
+        #region MagnificationFilter
+
+        public TextureMagFilter MagnificationFilter
+        {
+            get { return mag_filter; }
+            set { mag_filter = value; }
+        }
+
+        #endregion
+
+        #region MinificationFilter
+
+        public TextureMinFilter MinificationFilter
+        {
+            get { return min_filter; }
+            set { min_filter = value; }
+        }
+
+        #endregion
+
+        #region Bind
+
+        public void Bind()
+        {
+            GL.BindTexture(TextureTarget.Texture2D, (this as IGraphicsResource).Id);
+        }
+
+        #endregion
+
+        #region WriteRegion
+
+        public void WriteRegion(Rectangle source, Rectangle target, int mipLevel, Bitmap bitmap)
+        {
+            if (bitmap == null)
+                throw new ArgumentNullException("data");
+
+            GraphicsUnit unit = GraphicsUnit.Pixel;
+            if (!bitmap.GetBounds(ref unit).Contains(source))
+                throw new InvalidOperationException("The source Rectangle is larger than the Bitmap.");
+
+            if (mipLevel < 0)
+                throw new ArgumentOutOfRangeException("mipLevel");
+
+            Bind();
+
+            BitmapData data = null;
+
+            GL.PushClientAttrib(ClientAttribMask.ClientPixelStoreBit);
+            try
+            {
+                data = bitmap.LockBits(source, ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
+                GL.PixelStore(PixelStoreParameter.UnpackAlignment, 1);
+                GL.PixelStore(PixelStoreParameter.UnpackRowLength, bitmap.Width);
+                GL.TexSubImage2D(TextureTarget.Texture2D, mipLevel,
+                    target.Left, target.Top,
+                    target.Width, target.Height,
+                    OpenTK.Graphics.PixelFormat.Bgra,
+                    PixelType.UnsignedByte, data.Scan0);
+            }
+            finally
+            {
+                GL.PopClientAttrib();
+                if (data != null)
+                    bitmap.UnlockBits(data);
+            }
+        }
+
+        #endregion
+
+        #region ReadRegion
+
+        public TextureRegion2D ReadRegion(Rectangle rect, int mipLevel)
+        {
+            if (mipLevel < 0)
+                throw new ArgumentOutOfRangeException("miplevel");
+
+            TextureRegion2D<int> region = new TextureRegion2D<int>(rect);
+
+            GL.GetTexImage(TextureTarget.Texture2D, mipLevel, OpenTK.Graphics.PixelFormat.Bgra, PixelType.UnsignedByte, region.Data);
+
+            return region;
+        }
+
+        #endregion
+
+        #region Equals
+
+        public override bool Equals(object obj)
+        {
+            if (obj is Texture2D)
+                return this.Equals((Texture2D)obj);
+
+            return false;
+        }
+
+        #endregion
+
+        #region public override int GetHashCode()
+
+        public override int GetHashCode()
+        {
+            return (this as IGraphicsResource).Id;
+        }
+
+        #endregion
+
+        #region public overrid string ToString()
+
+        public override string ToString()
+        {
+            return String.Format("Texture2D #{0} ({1}x{2}, {3})",
+                (this as IGraphicsResource).Id.ToString(),
+                Width.ToString(),
+                Height.ToString(),
+                InternalFormat.ToString());
+        }
+
+        #endregion
+
+        #endregion
+
+        #region Protected Members
+
+        #region InternalFormat
+
+        protected abstract PixelInternalFormat InternalFormat { get; }
+
+        #endregion
+
+        #endregion
+
+        #region Private Members
+
+        int CreateTexture(int width, int height)
+        {
+            int id = GL.GenTexture();
+            if (id == 0)
+                throw new GraphicsResourceException(String.Format("Texture creation failed, (Error: {0})", GL.GetError()));
+
+            SetDefaultTextureParameters(id);
+
+            GL.TexImage2D(TextureTarget.Texture2D, 0, InternalFormat, Width, Height, 0,
+                OpenTK.Graphics.PixelFormat.Rgba, PixelType.UnsignedByte, IntPtr.Zero);
+
+            return id;
+        }
+
+        void SetDefaultTextureParameters(int id)
+        {
+            // Ensure the texture is allocated.
+            GL.BindTexture(TextureTarget.Texture2D, id);
+            GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)All.Linear);
+            GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)All.Linear);
+            if (GL.SupportsExtension("Version12"))
+            {
+                GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)All.ClampToEdge);
+                GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)All.ClampToEdge);
+            }
+            else
+            {
+                GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)All.Clamp);
+                GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)All.Clamp);
+            }
+        }
+
+        #endregion
+
+        #region IGraphicsResource Members
+
+        #region IGraphicsResource.Context
+
+        IGraphicsContext IGraphicsResource.Context { get { return context; } }
+
+        #endregion
+
+        #region IGraphicsResource.Id
+
+        int IGraphicsResource.Id
+        {
+            get
+            {
+                if (id == 0)
+                {
+                    GraphicsContext.Assert();
+                    context = GraphicsContext.CurrentContext;
+
+                    id = CreateTexture(Width, Height);
+                }
+
+                return id;
+            }
+        }
+
+        #endregion
+
+        #endregion
+
+        #region IEquatable<Texture2D> Members
+
+        public bool Equals(Texture2D other)
+        {
+            return (this as IGraphicsResource).Id == (other as IGraphicsResource).Id;
+        }
+
+        #endregion
+
+        #region IDisposable Members
+
+        public void Dispose()
+        {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+
+        void Dispose(bool manual)
+        {
+            if (!disposed)
+            {
+                if (manual)
+                {
+                    GL.DeleteTexture(id);
+                }
+                else
+                {
+                    Debug.Print("[Warning] {0} leaked.", this);
+                }
+                disposed = true;
+            }
+        }
+
+        ~Texture2D()
+        {
+            Dispose(false);
+        }
+
+        #endregion
+    }
+}

Source/Compatibility/Graphics/TextureRegion2D.cs

@@ -0,0 +1,79 @@
+#region License
+//
+// The Open Toolkit Library License
+//
+// Copyright (c) 2006 - 2008 the Open Toolkit library, except where noted.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights to 
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do
+// so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+//
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Drawing;
+
+namespace OpenTK.Graphics
+{
+    abstract class TextureRegion2D
+    {
+        Rectangle rectangle;
+
+        public Rectangle Rectangle { get { return rectangle; } protected set { rectangle = value; } }
+    }
+
+    /// <summary>
+    /// Holds part or the whole of a 2d OpenGL texture.
+    /// </summary>
+    class TextureRegion2D<T> : TextureRegion2D where T : struct
+    {
+        #region Fields
+
+        T[,] data;
+
+        #endregion
+
+        #region Constructors
+
+        internal TextureRegion2D(Rectangle rect)
+        {
+            data = new T[rect.Width, rect.Height];
+            Rectangle = rect;
+        }
+
+        #endregion
+
+        #region Public Members
+
+        public T this[int x, int y]
+        {
+            get { return data[x, y]; }
+            set { data[x, y] = value; }
+        }
+
+        #endregion
+
+        #region Internal Members
+
+        internal T[,] Data { get { return data; } }
+
+        #endregion
+    }
+}