Removed SDL_GAMEPAD_TYPE_VIRTUAL, SDL_GAMEPAD_TYPE_AMAZON_LUNA, SDL_GAMEPAD_TYPE_GOOGLE_STADIA, and SDL_GAMEPAD_TYPE_NVIDIA_SHIELD

Removing SDL_GAMEPAD_TYPE_VIRTUAL allows a virtual controller to emulate another gamepad type. The other controller types can be treated as generic controllers by applications without special glyph or functionality treatment.

docs/README-migration.md

@@ -254,6 +254,33 @@ The gamepad binding structure has been removed in favor of exchanging bindings i
 
 SDL_GameControllerGetSensorDataWithTimestamp() has been removed. If you want timestamps for the sensor data, you should use the sensor_timestamp member of SDL_EVENT_GAMEPAD_SENSOR_UPDATE events.
 
+SDL_CONTROLLER_TYPE_VIRTUAL has been removed, so virtual controllers can emulate other gamepad types. If you need to know whether a controller is virtual, you can use SDL_IsJoystickVirtual().
+
+SDL_CONTROLLER_TYPE_AMAZON_LUNA has been removed, and can be replaced with this code:
+```c
+SDL_bool SDL_IsJoystickAmazonLunaController(Uint16 vendor_id, Uint16 product_id)
+{
+    return ((vendor_id == 0x1949 && product_id == 0x0419) ||
+            (vendor_id == 0x0171 && product_id == 0x0419));
+}
+```
+
+SDL_CONTROLLER_TYPE_GOOGLE_STADIA has been removed, and can be replaced with this code:
+```c
+SDL_bool SDL_IsJoystickGoogleStadiaController(Uint16 vendor_id, Uint16 product_id)
+{
+    return (vendor_id == 0x18d1 && product_id == 0x9400);
+}
+```
+
+SDL_CONTROLLER_TYPE_NVIDIA_SHIELD has been removed, and can be replaced with this code:
+```c
+SDL_bool SDL_IsJoystickNVIDIASHIELDController(Uint16 vendor_id, Uint16 product_id)
+{
+    return (vendor_id == 0x0955 && (product_id == 0x7210 || product_id == 0x7214));
+}
+```
+
 The following enums have been renamed:
 * SDL_GameControllerAxis => SDL_GamepadAxis
 * SDL_GameControllerBindType => SDL_GamepadBindingType