Add NoGUI frontend based on old SDL frontend + fullscreen UI

src/duckstation-nogui/main.cpp

@@ -0,0 +1,48 @@
+#include "common/assert.h"
+#include "common/log.h"
+#include "core/system.h"
+#include "frontend-common/sdl_initializer.h"
+#include "sdl_host_interface.h"
+#include <SDL.h>
+#include <cstdio>
+#include <cstdlib>
+
+int main(int argc, char* argv[])
+{
+  FrontendCommon::EnsureSDLInitialized();
+
+  std::unique_ptr<SDLHostInterface> host_interface = SDLHostInterface::Create();
+  std::unique_ptr<SystemBootParameters> boot_params;
+  if (!host_interface->ParseCommandLineParameters(argc, argv, &boot_params))
+  {
+    SDL_Quit();
+    return EXIT_FAILURE;
+  }
+
+  if (!host_interface->Initialize())
+  {
+    host_interface->Shutdown();
+    SDL_Quit();
+    return EXIT_FAILURE;
+  }
+
+  if (boot_params)
+  {
+    if (!host_interface->BootSystem(*boot_params) && host_interface->InBatchMode())
+    {
+      host_interface->Shutdown();
+      host_interface.reset();
+      SDL_Quit();
+      return EXIT_FAILURE;
+    }
+
+    boot_params.reset();
+  }
+
+  host_interface->Run();
+  host_interface->Shutdown();
+  host_interface.reset();
+
+  SDL_Quit();
+  return EXIT_SUCCESS;
+}