Added the hint SDL_HINT_JOYSTICK_WGI to control whether to use Windows.Gaming.Input for controllers

WhatsNew.txt

@@ -1,6 +1,13 @@
 
 This is a list of major changes in SDL's version history.
 
+---------------------------------------------------------------------------
+2.28.2:
+---------------------------------------------------------------------------
+General:
+* Added the hint SDL_HINT_JOYSTICK_WGI to control whether to use Windows.Gaming.Input for controllers
+
+
 ---------------------------------------------------------------------------
 2.28.0:
 ---------------------------------------------------------------------------

include/SDL_hints.h

@@ -1007,6 +1007,15 @@ extern "C" {
   */
 #define SDL_HINT_JOYSTICK_THREAD "SDL_JOYSTICK_THREAD"
 
+/**
+  *  \brief  A variable controlling whether Windows.Gaming.Input should be used for controller handling.
+  *
+  *  This variable can be set to the following values:
+  *    "0"       - WGI is not used
+  *    "1"       - WGI is used (the default)
+  */
+#define SDL_HINT_JOYSTICK_WGI "SDL_JOYSTICK_WGI"
+
 /**
  * \brief Determines whether SDL enforces that DRM master is required in order
  *        to initialize the KMSDRM video backend.

src/joystick/windows/SDL_rawinputjoystick.c

@@ -564,6 +564,10 @@ static void RAWINPUT_UpdateWindowsGamingInput()
 }
 static void RAWINPUT_InitWindowsGamingInput(RAWINPUT_DeviceContext *ctx)
 {
+    if (!SDL_GetHintBoolean(SDL_HINT_JOYSTICK_WGI, SDL_TRUE)) {
+        return;
+    }
+
     wgi_state.need_device_list_update = SDL_TRUE;
     wgi_state.ref_count++;
     if (!wgi_state.initialized) {
@@ -879,12 +883,12 @@ static int RAWINPUT_JoystickInit(void)
 {
     SDL_assert(!SDL_RAWINPUT_inited);
 
-    if (!WIN_IsWindowsVistaOrGreater()) {
-        /* According to bug 6400, this doesn't work on Windows XP */
-        return -1;
+    if (!SDL_GetHintBoolean(SDL_HINT_JOYSTICK_RAWINPUT, SDL_TRUE)) {
+        return 0;
     }
 
-    if (!SDL_GetHintBoolean(SDL_HINT_JOYSTICK_RAWINPUT, SDL_TRUE)) {
+    if (!WIN_IsWindowsVistaOrGreater()) {
+        /* According to bug 6400, this doesn't work on Windows XP */
         return -1;
     }
 

src/joystick/windows/SDL_windows_gaming_input.c

@@ -483,6 +483,10 @@ static int WGI_JoystickInit(void)
     RoGetActivationFactory_t RoGetActivationFactoryFunc = NULL;
     HRESULT hr;
 
+    if (!SDL_GetHintBoolean(SDL_HINT_JOYSTICK_WGI, SDL_TRUE)) {
+        return 0;
+    }
+
     if (FAILED(WIN_RoInitialize())) {
         return SDL_SetError("RoInitialize() failed");
     }