Retain Apple bridge services and bind Win32 runtime

src/platform_windows/windows_runtime_shell.cpp

@@ -3,6 +3,7 @@
 #include "platform_windows/windows_runtime_shell.h"
 
 #include "app.h"
+#include "app_runtime.h"
 #include "log.h"
 #include "platform_windows/windows_bootstrap_helpers.h"
 #include "platform_windows/windows_lifecycle_shell.h"
@@ -16,6 +17,16 @@ namespace pp::platform::windows {
 
 namespace {
 
+struct RetainedWindowsRuntimeState final {
+    AppRuntime* runtime = nullptr;
+};
+
+[[nodiscard]] RetainedWindowsRuntimeState& retained_runtime_state()
+{
+    static RetainedWindowsRuntimeState state;
+    return state;
+}
+
 void register_touch_window(HWND hWnd)
 {
     // link: https://docs.microsoft.com/en-us/windows/desktop/api/winuser/nf-winuser-registertouchwindow
@@ -102,12 +113,23 @@ void shutdown_main_window_runtime(const MainWindowStartupState& startup, HINSTAN
 
 }
 
+void bind_runtime(AppRuntime* runtime) noexcept
+{
+    retained_runtime_state().runtime = runtime;
+}
+
+AppRuntime* bound_runtime() noexcept
+{
+    return retained_runtime_state().runtime;
+}
+
 int run_main_application(int argc, char** argv)
 {
     auto& state = retained_state();
     state.hInst = GetModuleHandle(NULL);
 
     App::I = new App();
+    bind_runtime(&App::I->runtime());
     App::I->set_platform_services(&pp::platform::windows::platform_services());
     App::I->initLog();
 
@@ -136,8 +158,10 @@ int run_main_application(int argc, char** argv)
     case pp::platform::windows::MainStartupResult::Ok:
         break;
     case pp::platform::windows::MainStartupResult::GladLoadFailure:
+        bind_runtime(nullptr);
         return 0;
     case pp::platform::windows::MainStartupResult::MissingCoreContextSupport:
+        bind_runtime(nullptr);
         return -1;
     }
 
@@ -151,6 +175,7 @@ int run_main_application(int argc, char** argv)
         case const_hash("convert"):
             App::I->initShaders();
             App::I->cmd_convert(argv[2], argv[3]);
+            bind_runtime(nullptr);
             return 0;
         case const_hash("-vrmode"):
             start_in_vr = true;