nsyshid: add libusb backend

This adds a backend for nsyshid, that uses libusb to provide passthrough access to real usb devices.

.github/workflows/build.yml

@@ -232,7 +232,7 @@ jobs:
     - name: "Install system dependencies"
       run: |
         brew update
-        brew install llvm@15 ninja nasm molten-vk
+        brew install llvm@15 ninja nasm molten-vk automake libtool
 
     - name: "Bootstrap vcpkg"
       run: |

BUILD.md

@@ -86,7 +86,7 @@ You can skip this section if you have an Intel Mac. Every time you compile, you
 
 ### Installing dependencies
 
-`brew install boost git cmake llvm ninja nasm molten-vk`
+`brew install boost git cmake llvm ninja nasm molten-vk automake libtool`
 
 ### Build Cemu using cmake and clang
 1. `git clone --recursive https://github.com/cemu-project/Cemu`

CMakeLists.txt

@@ -102,6 +102,12 @@ if (WIN32)
 endif()
 option(ENABLE_CUBEB "Enabled cubeb backend" ON)
 
+# usb hid backends
+option(ENABLE_NSYSHID_LIBUSB "Enables the libusb backend for nsyshid" ON)
+if (ENABLE_NSYSHID_LIBUSB)
+	add_compile_definitions(NSYSHID_ENABLE_BACKEND_LIBUSB)
+endif ()
+
 option(ENABLE_WXWIDGETS "Build with wxWidgets UI (Currently required)" ON)
 
 set(THREADS_PREFER_PTHREAD_FLAG true)

cmake/Findlibusb.cmake

@@ -0,0 +1,20 @@
+# SPDX-FileCopyrightText: 2022 Andrea Pappacoda <andrea@pappacoda.it>
+# SPDX-License-Identifier: ISC
+
+find_package(libusb CONFIG)
+if (NOT libusb_FOUND)
+    find_package(PkgConfig)
+    if (PKG_CONFIG_FOUND)
+        pkg_search_module(libusb IMPORTED_TARGET GLOBAL libusb-1.0 libusb)
+        if (libusb_FOUND)
+            add_library(libusb::libusb ALIAS PkgConfig::libusb)
+        endif ()
+    endif ()
+endif ()
+
+find_package_handle_standard_args(libusb
+        REQUIRED_VARS
+        libusb_LINK_LIBRARIES
+        libusb_FOUND
+        VERSION_VAR libusb_VERSION
+)

src/Cafe/CMakeLists.txt

@@ -438,6 +438,8 @@ add_library(CemuCafe
   OS/libs/nsyshid/AttachDefaultBackends.cpp
   OS/libs/nsyshid/Whitelist.cpp
   OS/libs/nsyshid/Whitelist.h
+  OS/libs/nsyshid/BackendLibusb.cpp
+  OS/libs/nsyshid/BackendLibusb.h
   OS/libs/nsyskbd/nsyskbd.cpp
   OS/libs/nsyskbd/nsyskbd.h
   OS/libs/nsysnet/nsysnet.cpp
@@ -528,6 +530,17 @@ if (ENABLE_WAYLAND)
   target_link_libraries(CemuCafe PUBLIC Wayland::Client)
 endif()
 
+if (ENABLE_NSYSHID_LIBUSB)
+	if (ENABLE_VCPKG)
+		find_package(libusb CONFIG REQUIRED)
+		target_include_directories(CemuCafe PRIVATE ${LIBUSB_INCLUDE_DIRS})
+		target_link_libraries(CemuCafe PRIVATE ${LIBUSB_LIBRARIES})
+	else ()
+		find_package(libusb MODULE REQUIRED)
+		target_link_libraries(CemuCafe PRIVATE libusb::libusb)
+	endif ()
+endif ()
+
 if (ENABLE_WXWIDGETS)
 	target_link_libraries(CemuCafe PRIVATE wx::base wx::core)
 endif()

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

@@ -1,9 +1,25 @@
 #include "nsyshid.h"
 #include "Backend.h"
 
+#if NSYSHID_ENABLE_BACKEND_LIBUSB
+
+#include "BackendLibusb.h"
+
+#endif
+
 namespace nsyshid::backend
 {
 	void AttachDefaultBackends()
 	{
+#if NSYSHID_ENABLE_BACKEND_LIBUSB
+		// add libusb backend
+		{
+			auto backendLibusb = std::make_shared<backend::libusb::BackendLibusb>();
+			if (backendLibusb->IsInitialisedOk())
+			{
+				AttachBackend(backendLibusb);
+			}
+		}
+#endif // NSYSHID_ENABLE_BACKEND_LIBUSB
 	}
 } // namespace nsyshid::backend