nsyshid: add windows hid backend

This adds a backend for nsyshid, that uses the Windows HID API to provide passthrough access to real usb devices.

CMakeLists.txt

@@ -103,7 +103,18 @@ endif()
 option(ENABLE_CUBEB "Enabled cubeb backend" ON)
 
 # usb hid backends
-option(ENABLE_NSYSHID_LIBUSB "Enables the libusb backend for nsyshid" ON)
+if (WIN32)
+	option(ENABLE_NSYSHID_WINDOWS_HID "Enables the native Windows HID backend for nsyshid" ON)
+endif ()
+# libusb and windows hid backends shouldn't be active at the same time; otherwise we'd see all devices twice!
+if (NOT ENABLE_NSYSHID_WINDOWS_HID)
+	option(ENABLE_NSYSHID_LIBUSB "Enables the libusb backend for nsyshid" ON)
+else ()
+	set(ENABLE_NSYSHID_LIBUSB OFF CACHE BOOL "" FORCE)
+endif ()
+if (ENABLE_NSYSHID_WINDOWS_HID)
+	add_compile_definitions(NSYSHID_ENABLE_BACKEND_WINDOWS_HID)
+endif ()
 if (ENABLE_NSYSHID_LIBUSB)
 	add_compile_definitions(NSYSHID_ENABLE_BACKEND_LIBUSB)
 endif ()

src/Cafe/CMakeLists.txt

@@ -440,6 +440,8 @@ add_library(CemuCafe
   OS/libs/nsyshid/Whitelist.h
   OS/libs/nsyshid/BackendLibusb.cpp
   OS/libs/nsyshid/BackendLibusb.h
+  OS/libs/nsyshid/BackendWindowsHID.cpp
+  OS/libs/nsyshid/BackendWindowsHID.h
   OS/libs/nsyskbd/nsyskbd.cpp
   OS/libs/nsyskbd/nsyskbd.h
   OS/libs/nsysnet/nsysnet.cpp

src/Cafe/OS/libs/nsyshid/AttachDefaultBackends.cpp

@@ -7,6 +7,12 @@
 
 #endif
 
+#if NSYSHID_ENABLE_BACKEND_WINDOWS_HID
+
+#include "BackendWindowsHID.h"
+
+#endif
+
 namespace nsyshid::backend
 {
 	void AttachDefaultBackends()
@@ -21,5 +27,15 @@ namespace nsyshid::backend
 			}
 		}
 #endif // NSYSHID_ENABLE_BACKEND_LIBUSB
+#if NSYSHID_ENABLE_BACKEND_WINDOWS_HID
+		// add windows hid backend
+		{
+			auto backendWindowsHID = std::make_shared<backend::windows::BackendWindowsHID>();
+			if (backendWindowsHID->IsInitialisedOk())
+			{
+				AttachBackend(backendWindowsHID);
+			}
+		}
+#endif // NSYSHID_ENABLE_BACKEND_WINDOWS_HID
 	}
 } // namespace nsyshid::backend