Add rotary input support for Android platform

doc/classes/InputEventMouseButton.xml

@@ -5,6 +5,7 @@
 	</brief_description>
 	<description>
 		Stores information about mouse click events. See [method Node._input].
+		[b]Note:[/b] On Wear OS devices, rotary input is mapped to [constant MOUSE_BUTTON_WHEEL_UP] and [constant MOUSE_BUTTON_WHEEL_DOWN]. This can be changed to [constant MOUSE_BUTTON_WHEEL_LEFT] and [constant MOUSE_BUTTON_WHEEL_RIGHT] with the [member ProjectSettings.input_devices/pointing/android/rotary_input_scroll_axis] setting.
 	</description>
 	<tutorials>
 		<link title="Using InputEvent">$DOCS_URL/tutorials/inputs/inputevent.html</link>

doc/classes/ProjectSettings.xml

@@ -1358,6 +1358,9 @@
 		<member name="input_devices/pointing/android/enable_pan_and_scale_gestures" type="bool" setter="" getter="" default="false">
 			If [code]true[/code], multi-touch pan and scale gestures are enabled on Android devices.
 		</member>
+		<member name="input_devices/pointing/android/rotary_input_scroll_axis" type="int" setter="" getter="" default="1">
+			On Wear OS devices, defines which axis of the mouse wheel rotary input is mapped to. This rotary input is usually performed by rotating the physical or virtual (touch-based) bezel on a smartwatch.
+		</member>
 		<member name="input_devices/pointing/emulate_mouse_from_touch" type="bool" setter="" getter="" default="true">
 			If [code]true[/code], sends mouse input events when tapping or swiping on the touchscreen.
 		</member>

main/main.cpp

@@ -2857,7 +2857,7 @@ Error Main::setup2() {
 
 		GLOBAL_DEF_BASIC("input_devices/pointing/android/enable_long_press_as_right_click", false);
 		GLOBAL_DEF_BASIC("input_devices/pointing/android/enable_pan_and_scale_gestures", false);
-
+		GLOBAL_DEF_BASIC(PropertyInfo(Variant::INT, "input_devices/pointing/android/rotary_input_scroll_axis", PROPERTY_HINT_ENUM, "Horizontal,Vertical"), 1);
 		OS::get_singleton()->benchmark_end_measure("Startup", "Setup Window and Boot");
 	}
 

platform/android/java/lib/src/org/godotengine/godot/Godot.kt

@@ -596,11 +596,13 @@ class Godot(private val context: Context) : SensorEventListener {
 		// These properties are defined after Godot setup completion, so we retrieve them here.
 		val longPressEnabled = java.lang.Boolean.parseBoolean(GodotLib.getGlobal("input_devices/pointing/android/enable_long_press_as_right_click"))
 		val panScaleEnabled = java.lang.Boolean.parseBoolean(GodotLib.getGlobal("input_devices/pointing/android/enable_pan_and_scale_gestures"))
+		val rotaryInputAxis = java.lang.Integer.parseInt(GodotLib.getGlobal("input_devices/pointing/android/rotary_input_scroll_axis"));
 
 		runOnUiThread {
 			renderView?.inputHandler?.apply {
 				enableLongPress(longPressEnabled)
 				enablePanningAndScalingGestures(panScaleEnabled)
+				setRotaryInputAxis(rotaryInputAxis)
 			}
 		}
 

platform/android/java/lib/src/org/godotengine/godot/input/GodotInputHandler.java

@@ -57,6 +57,9 @@
 public class GodotInputHandler implements InputManager.InputDeviceListener {
 	private static final String TAG = GodotInputHandler.class.getSimpleName();
 
+	private static final int ROTARY_INPUT_VERTICAL_AXIS = 1;
+	private static final int ROTARY_INPUT_HORIZONTAL_AXIS = 0;
+
 	private final SparseIntArray mJoystickIds = new SparseIntArray(4);
 	private final SparseArray<Joystick> mJoysticksDevices = new SparseArray<>(4);
 
@@ -71,6 +74,8 @@ public class GodotInputHandler implements InputManager.InputDeviceListener {
 	 */
 	private int lastSeenToolType = MotionEvent.TOOL_TYPE_UNKNOWN;
 
+	private static int rotaryInputAxis = ROTARY_INPUT_VERTICAL_AXIS;
+
 	public GodotInputHandler(GodotRenderView godotView) {
 		final Context context = godotView.getView().getContext();
 		mRenderView = godotView;
@@ -102,6 +107,13 @@ public void enablePanningAndScalingGestures(boolean enable) {
 		this.godotGestureHandler.setPanningAndScalingEnabled(enable);
 	}
 
+	/**
+	 * On Wear OS devices, sets which axis of the mouse wheel rotary input is mapped to. This is 1 (vertical axis) by default.
+	 */
+	public void setRotaryInputAxis(int axis) {
+		rotaryInputAxis = axis;
+	}
+
 	private boolean isKeyEventGameDevice(int source) {
 		// Note that keyboards are often (SOURCE_KEYBOARD | SOURCE_DPAD)
 		if (source == (InputDevice.SOURCE_KEYBOARD | InputDevice.SOURCE_DPAD))
@@ -484,8 +496,22 @@ static boolean handleMouseEvent(final MotionEvent event) {
 		final float tiltX = (float)-Math.sin(orientation) * tiltMult;
 		final float tiltY = (float)Math.cos(orientation) * tiltMult;
 
-		final float verticalFactor = event.getAxisValue(MotionEvent.AXIS_VSCROLL);
-		final float horizontalFactor = event.getAxisValue(MotionEvent.AXIS_HSCROLL);
+		float verticalFactor = 0;
+		float horizontalFactor = 0;
+
+		// If event came from RotaryEncoder (Bezel or Crown rotate event on Wear OS smart watches),
+		// convert it to mouse wheel event.
+		if (event.isFromSource(InputDevice.SOURCE_ROTARY_ENCODER)) {
+			if (rotaryInputAxis == ROTARY_INPUT_HORIZONTAL_AXIS) {
+				horizontalFactor = -event.getAxisValue(MotionEvent.AXIS_SCROLL);
+			} else {
+				// If rotaryInputAxis is not ROTARY_INPUT_HORIZONTAL_AXIS then use default ROTARY_INPUT_VERTICAL_AXIS axis.
+				verticalFactor = -event.getAxisValue(MotionEvent.AXIS_SCROLL);
+			}
+		} else {
+			verticalFactor = event.getAxisValue(MotionEvent.AXIS_VSCROLL);
+			horizontalFactor = event.getAxisValue(MotionEvent.AXIS_HSCROLL);
+		}
 		boolean sourceMouseRelative = false;
 		if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
 			sourceMouseRelative = event.isFromSource(InputDevice.SOURCE_MOUSE_RELATIVE);