[All] Initial implementation of INativeWindow.Cursor property

Affects issue #9

Source/OpenTK/INativeWindow.cs

@@ -132,6 +132,12 @@ namespace OpenTK
         [Obsolete("Use OpenTK.Input.Mouse/Keybord/Joystick/GamePad instead.")]
         OpenTK.Input.IInputDriver InputDriver { get; }
 
+        /// <summary>
+        /// Gets or sets the <see cref="OpenTK.MouseCursor"/> for this window.
+        /// </summary>
+        /// <value>The cursor.</value>
+        MouseCursor Cursor { get; set; }
+
         /// <summary>
         /// Gets or sets a value, indicating whether the mouse cursor is visible.
         /// </summary>

Source/OpenTK/NativeWindow.cs

@@ -259,6 +259,30 @@ namespace OpenTK
 
         #endregion
 
+        #region Cursor
+
+        /// <summary>
+        /// Gets or sets the <see cref="OpenTK.MouseCursor"/> for this window.
+        /// </summary>
+        public MouseCursor Cursor
+        {
+            get
+            {
+                EnsureUndisposed();
+                return implementation.Cursor;
+            }
+            set
+            {
+                EnsureUndisposed();
+                if (value == null)
+                    throw new ArgumentNullException();
+
+                implementation.Cursor = value;
+            }
+        }
+
+        #endregion
+
         #region Exists
 
         /// <summary>

Source/OpenTK/Platform/MacOS/CarbonGLNative.cs

@@ -83,6 +83,8 @@ namespace OpenTK.Platform.MacOS
         float mouse_rel_x;
         float mouse_rel_y;
 
+        MouseCursor cursor = MouseCursor.Default;
+
         #endregion
 
         #region AGL Device Hack
@@ -935,6 +937,18 @@ namespace OpenTK.Platform.MacOS
             }
         }
 
+        public MouseCursor Cursor
+        {
+            get
+            {
+                return cursor;
+            }
+            set
+            {
+                Debug.Print("[Warning] CarbonGLNative.Cursor property not implemented");
+            }
+        }
+
         public bool CursorVisible
         {
             get { return CG.CursorIsVisible(); }

Source/OpenTK/Platform/SDL2/Sdl2NativeWindow.cs

@@ -58,6 +58,8 @@ namespace OpenTK.Platform.SDL2
         WindowState previous_window_state = WindowState.Normal;
         WindowBorder window_border = WindowBorder.Resizable;
         Icon icon;
+        MouseCursor cursor = MouseCursor.Default;
+        IntPtr sdl_cursor = IntPtr.Zero;
         string window_title;
 
         // Used in KeyPress event to decode SDL UTF8 text strings
@@ -458,6 +460,78 @@ namespace OpenTK.Platform.SDL2
         public event EventHandler<EventArgs> MouseEnter = delegate { };
         public event EventHandler<EventArgs> MouseLeave = delegate { };
 
+        public MouseCursor Cursor
+        {
+            get
+            {
+                return cursor;
+            }
+            set
+            {
+                lock (sync)
+                {
+                    if (value != MouseCursor.Default)
+                    {
+                        // Free the previous cursor,
+                        // if one has been set.
+                        if (sdl_cursor != IntPtr.Zero)
+                        {
+                            SDL.FreeCursor(sdl_cursor);
+                            sdl_cursor = IntPtr.Zero;
+                            cursor = MouseCursor.Default;
+                        }
+
+                        // Set the new cursor
+                        if (value == MouseCursor.Default)
+                        {
+                            // Reset to default cursor
+                            SDL.SetCursor(SDL.GetDefaultCursor());
+                        }
+                        else
+                        {
+                            // Create and set a new cursor using
+                            // the rgba values supplied by the user
+                            unsafe
+                            {
+                                fixed (byte* pixels = value.Rgba)
+                                {
+                                    IntPtr cursor_surface =
+                                        SDL.CreateRGBSurfaceFrom(
+                                            new IntPtr(pixels),
+                                            cursor.Width,
+                                            cursor.Height,
+                                            32,
+                                            cursor.Width * 4,
+                                            0xff000000,
+                                            0x00ff0000,
+                                            0x0000ff00,
+                                            0x000000ff);
+
+                                    sdl_cursor = SDL.CreateColorCursor(
+                                        cursor_surface,
+                                        cursor.Width,
+                                        cursor.Height,
+                                        cursor.X,
+                                        cursor.Y);
+
+                                    if (sdl_cursor != IntPtr.Zero)
+                                    {
+                                        SDL.SetCursor(sdl_cursor);
+                                        cursor = value;
+                                    }
+
+                                    if (cursor_surface != IntPtr.Zero)
+                                    {
+                                        SDL.FreeSurface(cursor_surface);
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
         public void Close()
         {
             lock (sync)

Source/OpenTK/Platform/Windows/WinGLNative.cs

@@ -101,6 +101,7 @@ namespace OpenTK.Platform.Windows
         KeyboardKeyEventArgs key_up = new KeyboardKeyEventArgs();
         KeyPressEventArgs key_press = new KeyPressEventArgs((char)0);
 
+        MouseCursor cursor = MouseCursor.Default;
         int cursor_visible_count = 0;
 
         static readonly object SyncRoot = new object();
@@ -1164,7 +1165,23 @@ namespace OpenTK.Platform.Windows
         public bool Exists { get { return exists; } }
 
         #endregion
-        
+
+        #region Cursor
+
+        public MouseCursor Cursor
+        {
+            get
+            {
+                return cursor;
+            }
+            set
+            {
+                Debug.Print("[Warning] WinGLNative.Cursor property not implemented");
+            }
+        }
+
+        #endregion
+
         #region CursorVisible
         
         public bool CursorVisible

Source/OpenTK/Platform/X11/X11GLNative.cs

@@ -115,6 +115,8 @@ namespace OpenTK.Platform.X11
         bool isExiting;
 
         bool _decorations_hidden = false;
+
+        MouseCursor cursor = MouseCursor.Default;
         bool cursor_visible = true;
         int mouse_rel_x, mouse_rel_y;
 
@@ -1460,6 +1462,24 @@ namespace OpenTK.Platform.X11
         
         #endregion
 
+        #region Cursor
+
+        public MouseCursor Cursor
+        {
+            get
+            {
+                return cursor;
+            }
+            set
+            {
+                Debug.Print("[Warning] X11GLNative.Cursor property not implemented");
+            }
+        }
+
+        #endregion
+
+        #region CursorVisible
+
         public bool CursorVisible
         {
             get { return cursor_visible; }
@@ -1486,6 +1506,8 @@ namespace OpenTK.Platform.X11
 
         #endregion
 
+        #endregion
+
         #region --- INativeGLWindow Members ---
 
         #region public IInputDriver InputDriver