cmake: when there are alternatives, don't use libusb by default

CMakeLists.txt

@@ -499,8 +499,10 @@ dep_option(SDL_KMSDRM_SHARED       "Dynamically load KMS DRM support" ON "SDL_KM
 set_option(SDL_OFFSCREEN           "Use offscreen video driver" OFF)
 option_string(SDL_BACKGROUNDING_SIGNAL "number to use for magic backgrounding signal or 'OFF'" OFF)
 option_string(SDL_FOREGROUNDING_SIGNAL "number to use for magic foregrounding signal or 'OFF'" OFF)
-set_option(SDL_HIDAPI_JOYSTICK     "Use HIDAPI for low level joystick drivers" ON)
-set_option(SDL_VIRTUAL_JOYSTICK    "Enable the virtual-joystick driver" ON)
+set_option(SDL_HIDAPI              "Enable the HIDAPI subsystem" ON)
+dep_option(SDL_HIDAPI_LIBUSB       "Use libusb for low level joystick drivers" OFF SDL_HIDAPI OFF)
+dep_option(SDL_HIDAPI_JOYSTICK     "Use HIDAPI for low level joystick drivers" ON SDL_HIDAPI OFF)
+dep_option(SDL_VIRTUAL_JOYSTICK    "Enable the virtual-joystick driver" ON SDL_HIDAPI OFF)
 set_option(SDL_ASAN                "Use AddressSanitizer to detect memory errors" OFF)
 
 set(SDL_SHARED ${SDL_SHARED_ENABLED_BY_DEFAULT} CACHE BOOL "Build a shared version of the library")
@@ -513,6 +515,12 @@ set_option(SDL_INSTALL_TESTS   "Install test-cases" OFF)
 
 set(HAVE_STATIC_PIC "${SDL_STATIC_PIC}")
 
+if(HIDAPI_ONLY_LIBUSB)
+  set(SDL_HIDAPI_LIBUSB ON CACHE BOOL "" FORCE)
+elseif(HIDAPI_SKIP_LIBUSB)
+  set(SDL_HIDAPI_LIBUSB OFF CACHE BOOL "" FORCE)
+endif()
+
 if(VITA)
   set_option(VIDEO_VITA_PIB  "Build with PSVita piglet gles2 support" OFF)
   set_option(VIDEO_VITA_PVR  "Build with PSVita PVR gles/gles2 support" OFF)

cmake/sdlchecks.cmake

@@ -1176,10 +1176,10 @@ endmacro()
 # Check for HIDAPI support
 macro(CheckHIDAPI)
   set(HAVE_HIDAPI TRUE)
-  if(NOT HIDAPI_SKIP_LIBUSB)
+  if(SDL_HIDAPI_LIBUSB)
     set(HAVE_LIBUSB FALSE)
     pkg_check_modules(LIBUSB libusb-1.0)
-    if (LIBUSB_FOUND)
+    if(LIBUSB_FOUND)
       check_include_file(libusb.h HAVE_LIBUSB_H ${LIBUSB_CFLAGS})
       if(HAVE_LIBUSB_H)
         set(HAVE_LIBUSB TRUE)