Remapped the side button and trigger as paddles for the mini-gamepad mode of the Joy-Cons

This is the only case where the mapping differs between right and left Joy-Cons in mini-gamepad mode. The left Joy-Con will have the left paddles and the right Joy-Con will have the right paddles. This facilitates co-op gameplay with individual actions while still using the normal mini-gamepad mode.

The paddles are used for this because conceptually they are more awkward to hit than the normal controls and they are in roughly the correct hand position.

src/joystick/SDL_gamecontroller.c

@@ -615,7 +615,11 @@ static ControllerMapping_t *SDL_CreateMappingForHIDAPIController(SDL_JoystickGUI
                 }
             } else {
                 /* Mini gamepad mode */
-                SDL_strlcat(mapping_string, "a:b0,b:b1,guide:b5,leftshoulder:b9,leftstick:b7,leftx:a0,lefty:a1,rightshoulder:b10,start:b6,x:b2,y:b3,", sizeof(mapping_string));
+                if (guid.data[15] == k_eSwitchDeviceInfoControllerType_JoyConLeft) {
+                    SDL_strlcat(mapping_string, "a:b0,b:b1,guide:b5,leftshoulder:b9,leftstick:b7,leftx:a0,lefty:a1,rightshoulder:b10,start:b6,x:b2,y:b3,paddle2:b17,paddle4:b19,", sizeof(mapping_string));
+                } else {
+                    SDL_strlcat(mapping_string, "a:b0,b:b1,guide:b5,leftshoulder:b9,leftstick:b7,leftx:a0,lefty:a1,rightshoulder:b10,start:b6,x:b2,y:b3,paddle1:b16,paddle3:b18,", sizeof(mapping_string));
+                }
             }
             break;
         }

src/joystick/hidapi/SDL_hidapi_switch.c

@@ -1863,9 +1863,8 @@ static void HandleMiniControllerStateL(SDL_Joystick *joystick, SDL_DriverSwitch_
         SDL_PrivateJoystickButton(joystick, RemapButton(ctx, SDL_CONTROLLER_BUTTON_B), (data & 0x08) ? SDL_PRESSED : SDL_RELEASED);
         SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_RIGHTSHOULDER, (data & 0x10) ? SDL_PRESSED : SDL_RELEASED);
         SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_LEFTSHOULDER, (data & 0x20) ? SDL_PRESSED : SDL_RELEASED);
-        SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_PADDLE1, (data & 0x40) ? SDL_PRESSED : SDL_RELEASED);
-        axis = (data & 0x80) ? 32767 : -32768;
-        SDL_PrivateJoystickAxis(joystick, SDL_CONTROLLER_AXIS_TRIGGERLEFT, axis);
+        SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_PADDLE2, (data & 0x40) ? SDL_PRESSED : SDL_RELEASED);
+        SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_PADDLE4, (data & 0x80) ? SDL_PRESSED : SDL_RELEASED);
     }
 
     axis = packet->controllerState.rgucJoystickLeft[0] | ((packet->controllerState.rgucJoystickLeft[1] & 0xF) << 8);
@@ -1922,9 +1921,8 @@ static void HandleMiniControllerStateR(SDL_Joystick *joystick, SDL_DriverSwitch_
         SDL_PrivateJoystickButton(joystick, RemapButton(ctx, SDL_CONTROLLER_BUTTON_X), (data & 0x01) ? SDL_PRESSED : SDL_RELEASED);
         SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_RIGHTSHOULDER, (data & 0x10) ? SDL_PRESSED : SDL_RELEASED);
         SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_LEFTSHOULDER, (data & 0x20) ? SDL_PRESSED : SDL_RELEASED);
-        SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_PADDLE4, (data & 0x40) ? SDL_PRESSED : SDL_RELEASED);
-        axis = (data & 0x80) ? 32767 : -32768;
-        SDL_PrivateJoystickAxis(joystick, SDL_CONTROLLER_AXIS_TRIGGERRIGHT, axis);
+        SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_PADDLE1, (data & 0x40) ? SDL_PRESSED : SDL_RELEASED);
+        SDL_PrivateJoystickButton(joystick, SDL_CONTROLLER_BUTTON_PADDLE3, (data & 0x80) ? SDL_PRESSED : SDL_RELEASED);
     }
 
     if (packet->controllerState.rgucButtons[1] != ctx->m_lastFullState.controllerState.rgucButtons[1]) {