feat(macos): virtual HID gamepad emulating Razer Serval

cmake/compile_definitions/macos.cmake

@@ -35,12 +35,18 @@ list(APPEND SUNSHINE_EXTERNAL_LIBRARIES
         ${CORE_MEDIA_LIBRARY}
         ${CORE_VIDEO_LIBRARY}
         ${FOUNDATION_LIBRARY}
+        ${IOKIT_LIBRARY}
         ${VIDEO_TOOLBOX_LIBRARY})
 
 set(APPLE_PLIST_TEMPLATE "${SUNSHINE_SOURCE_ASSETS_DIR}/macos/build/Info.plist.in")
 set(APPLE_PLIST_FILE "${CMAKE_BINARY_DIR}/Info.plist")
 configure_file("${APPLE_PLIST_TEMPLATE}" "${APPLE_PLIST_FILE}" @ONLY)
 
+# Code-signing entitlements (used by the .app codesign step in
+# cmake/packaging/macos.cmake). Grants com.apple.hid.manager.user-access-device
+# for the virtual HID gamepad in src/platform/macos/input.cpp.
+set(APPLE_ENTITLEMENTS_FILE "${SUNSHINE_SOURCE_ASSETS_DIR}/macos/build/sunshine.entitlements")
+
 set(PLATFORM_TARGET_FILES
         "${CMAKE_SOURCE_DIR}/src/platform/macos/av_audio.h"
         "${CMAKE_SOURCE_DIR}/src/platform/macos/av_audio.mm"
@@ -49,6 +55,7 @@ set(PLATFORM_TARGET_FILES
         "${CMAKE_SOURCE_DIR}/src/platform/macos/av_video.m"
         "${CMAKE_SOURCE_DIR}/src/platform/macos/display.mm"
         "${CMAKE_SOURCE_DIR}/src/platform/macos/input.cpp"
+        "${CMAKE_SOURCE_DIR}/src/platform/macos/input_gamepad.h"
         "${CMAKE_SOURCE_DIR}/src/platform/macos/microphone.mm"
         "${CMAKE_SOURCE_DIR}/src/platform/macos/misc.mm"
         "${CMAKE_SOURCE_DIR}/src/platform/macos/misc.h"

cmake/dependencies/macos.cmake

@@ -9,6 +9,7 @@ FIND_LIBRARY(CORE_AUDIO_LIBRARY CoreAudio)
 FIND_LIBRARY(CORE_MEDIA_LIBRARY CoreMedia)
 FIND_LIBRARY(CORE_VIDEO_LIBRARY CoreVideo)
 FIND_LIBRARY(FOUNDATION_LIBRARY Foundation)
+FIND_LIBRARY(IOKIT_LIBRARY IOKit)
 FIND_LIBRARY(VIDEO_TOOLBOX_LIBRARY VideoToolbox)
 
 if(SUNSHINE_ENABLE_TRAY)

cmake/packaging/macos.cmake

@@ -81,9 +81,14 @@ else()
               endforeach()
           endif()
 
-          # Sign the app last
+          # Sign the app last. The --entitlements file grants
+          # com.apple.hid.manager.user-access-device, required by the virtual
+          # HID gamepad (src/platform/macos/input.cpp). This is an Apple-
+          # restricted entitlement: the signing identity must be authorized for
+          # it by Apple, or notarization/AMFI will reject the build.
           execute_process(COMMAND /usr/bin/codesign --verbose=2
               --sign \"${APPLE_CODESIGN_IDENTITY}\" \"\${_app}\"
+              --entitlements \"${APPLE_ENTITLEMENTS_FILE}\"
               --force --timestamp --options=runtime
               RESULT_VARIABLE rc3
           )

docs/building.md

@@ -234,6 +234,53 @@ ninja -C build
   }}
 }
 
+### macOS code signing & entitlements
+The macOS virtual gamepad publishes a virtual HID device via `IOHIDUserDeviceCreate`,
+which requires the `com.apple.hid.manager.user-access-device` entitlement. Without it,
+AMFI terminates Sunshine the moment a controller is first connected.
+
+The entitlements are defined in `src_assets/macos/build/sunshine.entitlements` and are
+applied automatically when the `.app` is signed (when `SHOULD_SIGN=true`).
+
+This is an Apple-**restricted** entitlement, which has two consequences:
+
+- **Official / distributed builds:** the Developer ID signing identity must be authorized
+  by Apple for this entitlement, otherwise notarization (and AMFI at runtime) will reject
+  the build.
+- **Local development (ad-hoc signed) builds:** ad-hoc signatures are not trusted to carry
+  restricted entitlements, so AMFI will still kill the process. To test the gamepad locally,
+  first sign the built `.app` with the entitlements:
+  ```bash
+  codesign --force --deep --sign - \
+    --entitlements src_assets/macos/build/sunshine.entitlements \
+    ./build/Sunshine.app
+  ```
+  Then relax AMFI enforcement so the ad-hoc binary is allowed to use the restricted
+  entitlement. AMFI is controlled by the `amfi_get_out_of_my_way=0x1` boot argument (there is
+  no `csrutil` switch for it), and setting boot arguments requires SIP to be disabled. **This
+  weakens system security and is intended for development machines only.**
+
+  - **Intel:** boot into Recovery (⌘-R), open Terminal, then:
+    ```bash
+    csrutil disable
+    nvram boot-args="amfi_get_out_of_my_way=0x1"
+    ```
+    Reboot back into macOS.
+  - **Apple Silicon:** boot into Recovery (hold the power button), set the startup disk to
+    *Reduced Security* with *"Allow user management of kernel extensions"* via Startup Security
+    Utility, then from a Recovery Terminal:
+    ```bash
+    csrutil disable
+    bputil -k    # follow the prompts to allow boot-args
+    nvram boot-args="amfi_get_out_of_my_way=0x1"
+    ```
+    Reboot back into macOS. (Exact steps vary by macOS version — consult Apple's current
+    Startup Security Utility documentation.)
+
+  When you are done developing, **revert these changes**: clear the boot argument
+  (`sudo nvram -d boot-args`) and re-enable SIP from Recovery with `csrutil enable` (and
+  restore *Full Security* on Apple Silicon).
+
 ### Remote Build
 It may be beneficial to build remotely in some cases. This will enable easier building on different operating systems.