Better cleanup when the graphics and window subsystems are destroyed and restarted.

src/modules/graphics/opengl/Graphics.cpp

@@ -50,6 +50,8 @@ Graphics::Graphics()
 	, created(false)
 	, activeStencil(false)
 {
+	gl = OpenGL();
+
 	states.reserve(10);
 	states.push_back(DisplayState());
 

src/modules/window/sdl/Window.cpp

@@ -48,12 +48,18 @@ Window::Window()
 
 Window::~Window()
 {
+	if (context)
+	{
+		graphics::Graphics *gfx = Module::getInstance<graphics::Graphics>(Module::M_GRAPHICS);
+		if (gfx != nullptr)
+			gfx->unSetMode();
+
+		SDL_GL_DeleteContext(context);
+	}
+
 	if (window)
 		SDL_DestroyWindow(window);
 
-	if (context)
-		SDL_GL_DeleteContext(context);
-
 	SDL_QuitSubSystem(SDL_INIT_VIDEO);
 }