Render via an intermediate frame buffer.

OpenRA.Game/Graphics/PlatformInterfaces.cs

@@ -41,6 +41,8 @@ namespace OpenRA
 
 		Size WindowSize { get; }
 		float WindowScale { get; }
+		Size SurfaceSize { get; }
+
 		event Action<float, float> OnWindowScaleChanged;
 
 		void PumpInput(IInputHandler inputHandler);
@@ -62,7 +64,7 @@ namespace OpenRA
 		IFrameBuffer CreateFrameBuffer(Size s);
 		IFrameBuffer CreateFrameBuffer(Size s, Color clearColor);
 		IShader CreateShader(string name);
-		void EnableScissor(int left, int top, int width, int height);
+		void EnableScissor(int x, int y, int width, int height);
 		void DisableScissor();
 		void SaveScreenshot(string path);
 		void Present();