Added VSync property to IGLContext.

Source/OpenTK/GLContext.cs

@@ -153,6 +153,15 @@ namespace OpenTK
             return implementation.GetDisplayModes();
         }
 
+        /// <summary>
+        /// Gets or sets a value indicating whether VSync is enabled.
+        /// </summary>
+        public bool VSync
+        {
+            get { return implementation.VSync; }
+            set { implementation.VSync = value;  }
+        }
+
         #endregion
 
         #region IDisposable Members

Source/OpenTK/Platform/DummyGLContext.cs

@@ -34,6 +34,8 @@ namespace OpenTK.Platform
         public IntPtr GetAddress(string function) { return IntPtr.Zero; }
         public IEnumerable<DisplayMode> GetDisplayModes() { return null; }
 
+        public bool VSync { get { return false; } set { } }
+
         #endregion
 
         #region --- IDisposable Members ---

Source/OpenTK/Platform/IGLContext.cs

@@ -87,5 +87,10 @@ namespace OpenTK.Platform
         /// </summary>
         /// <returns>An IEnumerable containing all supported display modes.</returns>
         IEnumerable<DisplayMode> GetDisplayModes();
+
+        /// <summary>
+        /// Gets or sets a value indicating whether VSyncing is enabled.
+        /// </summary>
+        bool VSync { get; set; }
     }
 }

Source/OpenTK/Platform/Windows/WinGLContext.cs

@@ -32,6 +32,7 @@ namespace OpenTK.Platform.Windows
         private WindowInfo windowInfo = new WindowInfo();
 
         private DisplayMode mode;
+        private bool vsync_supported;
 
         private bool disposed;
 
@@ -232,6 +233,11 @@ namespace OpenTK.Platform.Windows
             Wgl.Imports.MakeCurrent(deviceContext, renderContext);
             Wgl.LoadAll();
 
+            vsync_supported = 
+                (Wgl.ARB.SupportsExtension(this.deviceContext, "WGL_EXT_swap_control") ||
+                 Wgl.EXT.SupportsExtension(this.deviceContext, "WGL_EXT_swap_control")) &&
+                Wgl.Load("wglGetSwapIntervalEXT") && Wgl.Load("wglSwapIntervalEXT");
+
             if (source != null)
             {
                 Debug.Print("Sharing state with context {0}", (source as WinGLContext).Context);
@@ -322,6 +328,19 @@ namespace OpenTK.Platform.Windows
 
         #endregion
 
+        public bool VSync
+        {
+            get
+            {
+                //return vsync != 0;
+                return Wgl.EXT.GetSwapInterval() != 0;
+            }
+            set
+            {
+                Wgl.EXT.SwapInterval(value ? 1 : 0);
+            }
+        }
+
         #endregion
 
         #region --- IDisposable Members ---

Source/OpenTK/Platform/X11/X11GLContext.cs

@@ -267,6 +267,18 @@ namespace OpenTK.Platform.X11
             throw new Exception("The method or operation is not implemented.");
         }
 
+        public bool VSync
+        {
+            get
+            {
+                return false;
+            }
+            set
+            {
+
+            }
+        }
+
         #endregion
 
         #region --- IDisposable Members ---