Fix viewports crashing

Author: Steve987321

Engine/src/engine/AppWindow.cpp

@@ -102,6 +102,9 @@ void AppWindow::AddViewport(const sf::VideoMode& mode, std::string_view title, u
 	window->setFramerateLimit(30);
 	bool res = ImGui::SFML::Init(*window, true);
 	LOGDEBUGF("[AddViewport] ImGui SFML Init result: {}", res);
+    if (!res)
+        return;
+
 	viewports.push_back(std::move(window));
 }
 
@@ -150,6 +153,14 @@ std::queue<std::filesystem::path>& AppWindow::GetDroppedFilesQueue()
 	return dropped_files_queue;
 }
 
+void AppWindow::CleanUpViewports() 
+{
+    for (auto& v : viewports)
+        v->close();
+    
+    viewports.clear();
+}
+
 #ifdef _WIN32
 LRESULT CALLBACK AppWindow::WndProc(HWND handle, UINT message, WPARAM wparam, LPARAM lparam)
 {

Engine/src/engine/AppWindow.h

@@ -28,6 +28,8 @@ class ENGINE_API AppWindow : public sf::RenderWindow
 
 	static std::queue<std::filesystem::path>& GetDroppedFilesQueue();
 
+    static void CleanUpViewports();
+
 #ifdef _WIN32
 	static inline LONG_PTR orginal_wnd_proc = NULL;
 	static LRESULT CALLBACK WndProc(HWND handle, UINT message, WPARAM wparam, LPARAM lparam);

Engine/src/engine/Engine.cpp

@@ -350,13 +350,13 @@ void Render(AppWindow& window)
 
 	// imgui
 	render_ui(ImGui::GetCurrentContext());
+	AppWindow::UpdateViewports(event_callback);
 
 	for (auto& obj : Scene::current_scene.objects_all)
 		for (auto& [name, script] : obj->GetAttachedScripts())
 			script->OnImGui(obj.get(), ImGui::GetCurrentContext());
 
 	ImGui::SFML::Render(window);
-	AppWindow::UpdateViewports(event_callback);
 #else
 #if defined(TOAD_EDITOR) || !defined(NDEBUG)
 	for (auto& obj : Scene::current_scene.objects_all)
@@ -535,6 +535,8 @@ void CleanUp()
 
 	LOGDEBUG("closing window");
 	GetWindow().close();
+
+    AppWindow::CleanUpViewports();
 }
 
 Camera& GetEditorCamera()