Fixed detecting the guide button on Xbox One S controllers over Bluetooth on Linux

Xcode/SDL/SDL.xcodeproj/project.pbxproj

@@ -119,6 +119,7 @@ typedef struct {
     Uint8 sequence;
     Uint32 send_time;
     Uint8 last_state[USB_PACKET_LENGTH];
+    SDL_bool has_guide_packet;
     SDL_bool has_paddles;
     SDL_bool has_trigger_rumble;
     SDL_bool has_share_button;
@@ -621,7 +622,7 @@ HIDAPI_DriverXboxOneBluetooth_HandleButtons16(SDL_Joystick *joystick, SDL_Driver
 }
 
 /*
- * Xbox One S with firmware 4.8.1923 uses a 17 byte packet with BACK button in byte 16 and the GUIDE button in a separate packet
+ * Xbox One S with firmware 4.8.1923 uses a 17 byte packet with BACK button in byte 16 and the GUIDE button in a separate packet (on Windows), or in byte 15 (on Linux)
  * Xbox One Elite Series 2 with firmware 4.7.1872 uses a 55 byte packet with BACK button in byte 16, paddles starting at byte 33, and the GUIDE button in a separate packet
  * Xbox One Elite Series 2 with firmware 4.8.1908 uses a 33 byte packet with BACK button in byte 16, paddles starting at byte 17, and the GUIDE button in a separate packet
  * Xbox One Series X with firmware 5.5.2641 uses a 17 byte packet with BACK and GUIDE buttons in byte 15, and SHARE button in byte 17
@@ -642,6 +643,8 @@ HIDAPI_DriverXboxOneBluetooth_HandleButtons(SDL_Joystick *joystick, SDL_DriverXb
         if (ctx->has_share_button) {
             SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_BACK, (data[15] & 0x04) ? SDL_PRESSED : SDL_RELEASED);
             SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_GUIDE, (data[15] & 0x10) ? SDL_PRESSED : SDL_RELEASED);
+        } else if (!ctx->has_guide_packet) {
+            SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_GUIDE, (data[15] & 0x10) ? SDL_PRESSED : SDL_RELEASED);
         }
         SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_START, (data[15] & 0x08) ? SDL_PRESSED : SDL_RELEASED);
         SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_LEFTSTICK, (data[15] & 0x20) ? SDL_PRESSED : SDL_RELEASED);
@@ -795,6 +798,7 @@ HIDAPI_DriverXboxOneBluetooth_HandleStatePacket(SDL_Joystick *joystick, SDL_Driv
 static void
 HIDAPI_DriverXboxOneBluetooth_HandleGuidePacket(SDL_Joystick *joystick, SDL_DriverXboxOne_Context *ctx, Uint8 *data, int size)
 {
+    ctx->has_guide_packet = SDL_TRUE;
     SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_GUIDE, (data[1] & 0x01) ? SDL_PRESSED : SDL_RELEASED);
 }