Add VSync setting.

OpenRA.Platforms.Default/Sdl2GraphicsContext.cs

@@ -231,6 +231,12 @@ namespace OpenRA.Platforms.Default
 			OpenGL.CheckGLError();
 		}
 
+		public void SetVSyncEnabled(bool enabled)
+		{
+			VerifyThreadAffinity();
+			SDL.SDL_GL_SetSwapInterval(enabled ? 1 : 0);
+		}
+
 		public void Dispose()
 		{
 			if (disposed)

OpenRA.Platforms.Default/Sdl2PlatformWindow.cs

@@ -241,6 +241,8 @@ namespace OpenRA.Platforms.Default
 			else
 				context = new ThreadedGraphicsContext(new Sdl2GraphicsContext(this), batchSize);
 
+			context.SetVSyncEnabled(Game.Settings.Graphics.VSync);
+
 			SDL.SDL_SetModState(SDL.SDL_Keymod.KMOD_NONE);
 			input = new Sdl2Input();
 		}

OpenRA.Platforms.Default/ThreadedGraphicsContext.cs

@@ -49,6 +49,7 @@ namespace OpenRA.Platforms.Default
 		Action<object> doDrawPrimitives;
 		Action<object> doEnableScissor;
 		Action<object> doSetBlendMode;
+		Action<object> doSetVSync;
 
 		public ThreadedGraphicsContext(Sdl2GraphicsContext context, int batchSize)
 		{
@@ -107,6 +108,7 @@ namespace OpenRA.Platforms.Default
 							context.EnableScissor(t.Item1, t.Item2, t.Item3, t.Item4);
 						};
 					doSetBlendMode = mode => { context.SetBlendMode((BlendMode)mode); };
+					doSetVSync = enabled => { context.SetVSyncEnabled((bool)enabled); };
 
 					Monitor.Pulse(syncObject);
 				}
@@ -445,6 +447,11 @@ namespace OpenRA.Platforms.Default
 		{
 			Post(doSetBlendMode, mode);
 		}
+
+		public void SetVSyncEnabled(bool enabled)
+		{
+			Post(doSetVSync, enabled);
+		}
 	}
 
 	class ThreadedFrameBuffer : IFrameBuffer