[Kernel] Stub XamShowNuiTroubleshooterUI.

src/xenia/kernel/xam/xam_nui.cc

@@ -12,12 +12,16 @@
 #include "xenia/kernel/kernel_state.h"
 #include "xenia/kernel/util/shim_utils.h"
 #include "xenia/kernel/xam/xam_private.h"
+#include "xenia/ui/imgui_dialog.h"
+#include "xenia/ui/window.h"
 #include "xenia/xbox.h"
 
 namespace xe {
 namespace kernel {
 namespace xam {
 
+extern std::atomic<int> xam_dialogs_shown_;
+
 struct X_NUI_DEVICE_STATUS {
   xe::be<uint32_t> unk0;
   xe::be<uint32_t> unk1;
@@ -34,6 +38,31 @@ void XamNuiGetDeviceStatus(pointer_t<X_NUI_DEVICE_STATUS> status_ptr) {
 }
 DECLARE_XAM_EXPORT(XamNuiGetDeviceStatus, ExportTag::kStub);
 
+dword_result_t XamShowNuiTroubleshooterUI(unknown_t unk1, unknown_t unk2,
+                                          unknown_t unk3) {
+  // unk1 is 0xFF - possibly user index?
+  // unk2, unk3 appear to always be zero.
+
+  if (FLAGS_headless) {
+    return 0;
+  }
+
+  auto display_window = kernel_state()->emulator()->display_window();
+  xe::threading::Fence fence;
+  display_window->loop()->PostSynchronous([&]() {
+    xe::ui::ImGuiDialog::ShowMessageBox(
+        display_window, "NUI Troubleshooter",
+        "The game has indicated there is a problem with NUI (Kinect).")
+        ->Then(&fence);
+  });
+  ++xam_dialogs_shown_;
+  fence.Wait();
+  --xam_dialogs_shown_;
+
+  return 0;
+}
+DECLARE_XAM_EXPORT(XamShowNuiTroubleshooterUI, ExportTag::kStub);
+
 void RegisterNuiExports(xe::cpu::ExportResolver* export_resolver,
                         KernelState* kernel_state) {}