Add VSync setting.

OpenRA.Game/Graphics/PlatformInterfaces.cs

@@ -73,6 +73,7 @@ namespace OpenRA
 		void DisableDepthBuffer();
 		void ClearDepthBuffer();
 		void SetBlendMode(BlendMode mode);
+		void SetVSyncEnabled(bool enabled);
 		string GLVersion { get; }
 	}
 

OpenRA.Game/Renderer.cs

@@ -427,6 +427,11 @@ namespace OpenRA
 			Window.Dispose();
 		}
 
+		public void SetVSyncEnabled(bool enabled)
+		{
+			Window.Context.SetVSyncEnabled(enabled);
+		}
+
 		public string GetClipboardText()
 		{
 			return Window.GetClipboardText();

OpenRA.Game/Settings.cs

@@ -138,6 +138,9 @@ namespace OpenRA
 		[Desc("This can be set to Windowed, Fullscreen or PseudoFullscreen.")]
 		public WindowMode Mode = WindowMode.PseudoFullscreen;
 
+		[Desc("Enable VSync.")]
+		public bool VSync = true;
+
 		[Desc("Screen resolution in fullscreen mode.")]
 		public int2 FullscreenSize = new int2(0, 0);