Grab the mouse while in-game (#1637)

This only implements this for the SDL port for now.

src/game/C4Application.cpp

@@ -695,12 +695,16 @@ void C4Application::GameTick()
 		}
 		if(Config.Graphics.Windowed == 2 && FullScreenMode())
 			Application.SetVideoMode(GetConfigWidth(), GetConfigHeight(), Config.Graphics.RefreshRate, Config.Graphics.Monitor, true);
+		if (!isEditor)
+			pWindow->GrabMouse(true);
 		break;
 	case C4AS_AfterGame:
 		// stop game
 		Game.Clear();
 		if(Config.Graphics.Windowed == 2 && !NextMission && !isEditor)
 			Application.SetVideoMode(GetConfigWidth(), GetConfigHeight(), Config.Graphics.RefreshRate, Config.Graphics.Monitor, false);
+		if (!isEditor)
+			pWindow->GrabMouse(false);
 		AppState = C4AS_PreInit;
 		// if a next mission is desired, set to start it
 		if (NextMission)

src/platform/C4Window.h

@@ -381,6 +381,7 @@ public:
 	void SetSize(unsigned int cx, unsigned int cy); // resize
 	void SetTitle(const char * Title);
 	void FlashWindow();
+	void GrabMouse(bool grab);
 	// request that this window be redrawn in the near future (including immediately)
 	virtual void RequestUpdate();
 	// Invokes actual drawing code - should not be called directly

src/platform/C4WindowGTK.cpp

@@ -605,6 +605,11 @@ void C4Window::FlashWindow()
 	//FIXME - how is this reset? gtk_window_set_urgency_hint(window, true);
 }
 
+void C4Window::GrabMouse(bool grab)
+{
+	// TODO
+}
+
 C4Window* C4Window::Init(WindowKind windowKind, C4AbstractApp * pApp, const char * Title, const C4Rect * size)
 {
 	Active = true;

src/platform/C4WindowMac.mm

@@ -136,6 +136,11 @@ void C4Window::SetSize(unsigned int cx, unsigned int cy)
 	[controller setContentSize:NSMakeSize(cx, cy)];
 }
 
+void C4Window::GrabMouse(bool grab)
+{
+	// TODO
+}
+
 void C4Window::RequestUpdate()
 {
 	[ctrler.openGLView display];

src/platform/C4WindowSDL.cpp

@@ -119,3 +119,8 @@ void C4Window::RequestUpdate()
 void C4Window::FlashWindow()
 {
 }
+
+void C4Window::GrabMouse(bool grab)
+{
+	SDL_SetWindowGrab(window, grab ? SDL_TRUE : SDL_FALSE);
+}

src/platform/C4WindowWin32.cpp

@@ -761,6 +761,11 @@ void C4Window::FlashWindow()
 		::FlashWindow(hWindow, FLASHW_ALL | FLASHW_TIMERNOFG);
 }
 
+void C4Window::GrabMouse(bool grab)
+{
+	// TODO
+}
+
 void C4Window::EnumerateMultiSamples(std::vector<int>& samples) const
 {
 #ifndef USE_CONSOLE