Added support for high-dpi mode on Windows.

The platform factory for windows now calls SetProcessDPIAware
in order to enable support for high-dpi modes. The relevant
DllImport has been added to API.cs

Source/OpenTK/Platform/Windows/API.cs

@@ -945,6 +945,30 @@ namespace OpenTK.Platform.Windows
 
         #endregion
 
+        #region SetProcessDPIAware
+
+        /// <summary>
+        /// Sets the current process as dots per inch (dpi) aware.
+        /// Note: SetProcessDPIAware is subject to a possible race condition
+        /// if a DLL caches dpi settings during initialization.
+        /// For this reason, it is recommended that dpi-aware be set through
+        /// the application (.exe) manifest rather than by calling SetProcessDPIAware.
+        /// </summary>
+        /// <returns>
+        /// If the function succeeds, the return value is true.
+        /// Otherwise, the return value is false.
+        /// </returns>
+        /// <remarks>
+        /// DLLs should accept the dpi setting of the host process
+        /// rather than call SetProcessDPIAware themselves.
+        /// To be set properly, dpiAware should be specified as part
+        /// of the application (.exe) manifest.
+        /// </remarks>
+        [DllImport("user32.dll")]
+        internal static extern BOOL SetProcessDPIAware();
+
+        #endregion
+
         #endregion
 
         #region Input functions

Source/OpenTK/Platform/Windows/WinFactory.cs

@@ -27,6 +27,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Text;
 
 namespace OpenTK.Platform.Windows
@@ -39,6 +40,17 @@ namespace OpenTK.Platform.Windows
         readonly object SyncRoot = new object();
         IInputDriver2 inputDriver;
 
+        public WinFactory()
+        {
+            if (System.Environment.OSVersion.Version.Major >= 6)
+            {
+                // Enable high-dpi support
+                // Only available on Windows Vista and higher
+                bool result = Functions.SetProcessDPIAware();
+                Debug.Print("SetProcessDPIAware() returned {0}", result);
+            }
+        }
+
         #region IPlatformFactory Members
 
         public virtual INativeWindow CreateNativeWindow(int x, int y, int width, int height, string title, GraphicsMode mode, GameWindowFlags options, DisplayDevice device)