Use mouse event relative motion to calculate mouse velocity

core/input/input.cpp

@@ -504,18 +504,20 @@ void Input::_parse_input_event_impl(const Ref<InputEvent> &p_event, bool p_is_em
 	Ref<InputEventMouseMotion> mm = p_event;
 
 	if (mm.is_valid()) {
-		Point2 pos = mm->get_global_position();
-		if (mouse_pos != pos) {
-			set_mouse_position(pos);
+		Point2 position = mm->get_global_position();
+		if (mouse_pos != position) {
+			set_mouse_position(position);
 		}
+		Vector2 relative = mm->get_relative();
+		mouse_velocity_track.update(relative);
 
 		if (event_dispatch_function && emulate_touch_from_mouse && !p_is_emulated && (mm->get_button_mask() & MouseButton::LEFT) != MouseButton::NONE) {
 			Ref<InputEventScreenDrag> drag_event;
 			drag_event.instantiate();
 
-			drag_event->set_position(mm->get_position());
-			drag_event->set_relative(mm->get_relative());
-			drag_event->set_velocity(mm->get_velocity());
+			drag_event->set_position(position);
+			drag_event->set_relative(relative);
+			drag_event->set_velocity(get_last_mouse_velocity());
 
 			event_dispatch_function(drag_event);
 		}
@@ -696,7 +698,6 @@ void Input::set_gyroscope(const Vector3 &p_gyroscope) {
 }
 
 void Input::set_mouse_position(const Point2 &p_posf) {
-	mouse_velocity_track.update(p_posf - mouse_pos);
 	mouse_pos = p_posf;
 }
 

platform/javascript/display_server_javascript.cpp

@@ -137,7 +137,6 @@ int DisplayServerJavaScript::mouse_button_callback(int p_pressed, int p_button,
 	DisplayServerJavaScript *ds = get_singleton();
 
 	Point2 pos(p_x, p_y);
-	Input::get_singleton()->set_mouse_position(pos);
 	Ref<InputEventMouseButton> ev;
 	ev.instantiate();
 	ev->set_position(pos);
@@ -219,7 +218,6 @@ void DisplayServerJavaScript::mouse_move_callback(double p_x, double p_y, double
 	}
 
 	Point2 pos(p_x, p_y);
-	Input::get_singleton()->set_mouse_position(pos);
 	Ref<InputEventMouseMotion> ev;
 	ev.instantiate();
 	dom2godot_mod(ev, p_modifiers);
@@ -229,7 +227,6 @@ void DisplayServerJavaScript::mouse_move_callback(double p_x, double p_y, double
 	ev->set_global_position(pos);
 
 	ev->set_relative(Vector2(p_rel_x, p_rel_y));
-	Input::get_singleton()->set_mouse_position(ev->get_position());
 	ev->set_velocity(Input::get_singleton()->get_last_mouse_velocity());
 
 	Input::get_singleton()->parse_input_event(ev);

platform/linuxbsd/display_server_x11.cpp

@@ -3647,7 +3647,6 @@ void DisplayServerX11::process_events() {
 				mm->set_button_mask((MouseButton)mouse_get_button_state());
 				mm->set_position(pos);
 				mm->set_global_position(pos);
-				Input::get_singleton()->set_mouse_position(pos);
 				mm->set_velocity(Input::get_singleton()->get_last_mouse_velocity());
 
 				mm->set_relative(rel);

platform/osx/display_server_osx.mm

@@ -792,7 +792,6 @@ static void _mouseDownEvent(DisplayServer::WindowID window_id, NSEvent *event, M
 	mm->set_relative(relativeMotion);
 	_get_key_modifier_state([event modifierFlags], mm);
 
-	Input::get_singleton()->set_mouse_position(wd.mouse_pos);
 	Input::get_singleton()->parse_input_event(mm);
 }
 

platform/windows/display_server_windows.cpp

@@ -2078,7 +2078,6 @@ LRESULT DisplayServerWindows::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARA
 
 				mm->set_position(c);
 				mm->set_global_position(c);
-				Input::get_singleton()->set_mouse_position(c);
 				mm->set_velocity(Vector2(0, 0));
 
 				if (raw->data.mouse.usFlags == MOUSE_MOVE_RELATIVE) {
@@ -2183,7 +2182,6 @@ LRESULT DisplayServerWindows::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARA
 						SetCursorPos(pos.x, pos.y);
 					}
 
-					Input::get_singleton()->set_mouse_position(mm->get_position());
 					mm->set_velocity(Input::get_singleton()->get_last_mouse_velocity());
 
 					if (old_invalid) {
@@ -2325,7 +2323,6 @@ LRESULT DisplayServerWindows::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARA
 				SetCursorPos(pos.x, pos.y);
 			}
 
-			Input::get_singleton()->set_mouse_position(mm->get_position());
 			mm->set_velocity(Input::get_singleton()->get_last_mouse_velocity());
 
 			if (old_invalid) {
@@ -2426,7 +2423,6 @@ LRESULT DisplayServerWindows::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARA
 				SetCursorPos(pos.x, pos.y);
 			}
 
-			Input::get_singleton()->set_mouse_position(mm->get_position());
 			mm->set_velocity(Input::get_singleton()->get_last_mouse_velocity());
 
 			if (old_invalid) {