Add deferred async scene asset loading

editor/src/Application.cpp

@@ -9,7 +9,9 @@
 #include "UI/BuiltInIcons.h"
 #include "Platform/Win32Utf8.h"
 #include "Platform/WindowsProcessDiagnostics.h"
+#include <XCEngine/Core/Asset/ResourceManager.h>
 #include <XCEngine/Debug/Logger.h>
+#include <chrono>
 #include <windows.h>
 
 namespace XCEngine {
@@ -141,12 +143,18 @@ bool Application::Initialize(HWND hwnd) {
         return false;
     }
 
+    auto& resourceManager = ::XCEngine::Resources::ResourceManager::Get();
+    resourceManager.Initialize();
+    resourceManager.SetResourceRoot(projectRoot.c_str());
+    m_resourceManagerInitialized = true;
+
     logger.Info(Debug::LogCategory::General, "Initializing editor context...");
     InitializeEditorContext(projectRoot);
     logger.Info(Debug::LogCategory::General, "Initializing ImGui backend...");
     InitializeImGui(hwnd);
     logger.Info(Debug::LogCategory::General, "Attaching editor layer...");
     AttachEditorLayer();
+    m_hasLastFrameTime = false;
     logger.Info(Debug::LogCategory::General, "Editor initialization completed.");
     m_renderReady = true;
     return true;
@@ -154,6 +162,7 @@ bool Application::Initialize(HWND hwnd) {
 
 void Application::Shutdown() {
     m_renderReady = false;
+    m_hasLastFrameTime = false;
     DetachEditorLayer();
     if (m_editorContext) {
         static_cast<EditorContext*>(m_editorContext.get())->SetViewportHostService(nullptr);
@@ -163,6 +172,10 @@ void Application::Shutdown() {
     m_imguiBackend.Shutdown();
     m_imguiSession.Shutdown();
     ShutdownEditorContext();
+    if (m_resourceManagerInitialized) {
+        ::XCEngine::Resources::ResourceManager::Get().Shutdown();
+        m_resourceManagerInitialized = false;
+    }
     m_windowRenderer.Shutdown();
 }
 
@@ -170,6 +183,16 @@ void Application::Render() {
     if (!m_renderReady) {
         return;
     }
+
+    const auto now = std::chrono::steady_clock::now();
+    float deltaTime = 0.0f;
+    if (m_hasLastFrameTime) {
+        deltaTime = std::chrono::duration<float>(now - m_lastFrameTime).count();
+    }
+    m_lastFrameTime = now;
+    m_hasLastFrameTime = true;
+
+    m_layerStack.onUpdate(deltaTime);
     RenderEditorFrame();
 }
 
@@ -206,6 +229,8 @@ bool Application::SwitchProject(const std::string& projectPath) {
     const std::string infoMessage = "Switched editor project root: " + projectPath;
     logger.Info(Debug::LogCategory::General, infoMessage.c_str());
 
+    ::XCEngine::Resources::ResourceManager::Get().SetResourceRoot(projectPath.c_str());
+
     m_lastWindowTitle.clear();
     UpdateWindowTitle();