NoGUI: Merge in old branch and use base NoGUI class for SDL

src/duckstation-nogui/win32_host_interface.h

@@ -0,0 +1,34 @@
+#pragma once
+#include "common/windows_headers.h"
+#include "nogui_host_interface.h"
+#include <memory>
+#include <vector>
+
+class Win32HostInterface final : public NoGUIHostInterface
+{
+public:
+  Win32HostInterface();
+  ~Win32HostInterface();
+
+  bool Initialize();
+  void Shutdown();
+
+  static std::unique_ptr<NoGUIHostInterface> Create();
+
+protected:
+  bool CreatePlatformWindow() override;
+  void DestroyPlatformWindow() override;
+  std::optional<WindowInfo> GetPlatformWindowInfo() override;
+
+  std::optional<HostKeyCode> GetHostKeyCode(const std::string_view key_code) const override;
+
+  void PollAndUpdate() override;
+
+private:
+  static LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam);
+
+  bool RegisterWindowClass();
+  void ProcessWin32Events();
+
+  HWND m_hwnd{};
+};