Use mouse event relative motion to calculate mouse speed

main/input_default.cpp

@@ -355,18 +355,20 @@ void InputDefault::_parse_input_event_impl(const Ref<InputEvent> &p_event, bool
 	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_speed_track.update(relative);
 
 		if (main_loop && emulate_touch_from_mouse && !p_is_emulated && mm->get_button_mask() & 1) {
 			Ref<InputEventScreenDrag> drag_event;
 			drag_event.instance();
 
-			drag_event->set_position(mm->get_position());
-			drag_event->set_relative(mm->get_relative());
-			drag_event->set_speed(mm->get_speed());
+			drag_event->set_position(position);
+			drag_event->set_relative(relative);
+			drag_event->set_speed(get_last_mouse_speed());
 
 			main_loop->input_event(drag_event);
 		}
@@ -552,7 +554,6 @@ void InputDefault::set_main_loop(MainLoop *p_main_loop) {
 }
 
 void InputDefault::set_mouse_position(const Point2 &p_posf) {
-	mouse_speed_track.update(p_posf - mouse_pos);
 	mouse_pos = p_posf;
 }
 

platform/javascript/os_javascript.cpp

@@ -316,7 +316,6 @@ void OS_JavaScript::mouse_move_callback(double p_x, double p_y, double p_rel_x,
 	ev->set_global_position(ev->get_position());
 
 	ev->set_relative(Vector2(p_rel_x, p_rel_y));
-	os->input->set_mouse_position(ev->get_position());
 	ev->set_speed(os->input->get_last_mouse_speed());
 
 	os->input->parse_input_event(ev);

platform/osx/os_osx.mm

@@ -806,7 +806,6 @@ static void _mouseDownEvent(NSEvent *event, int index, int mask, bool pressed) {
 	mm->set_relative(relativeMotion);
 	get_key_modifier_state([event modifierFlags], mm);
 
-	OS_OSX::singleton->input->set_mouse_position(Point2(mouse_x, mouse_y));
 	OS_OSX::singleton->push_input(mm);
 }
 

platform/windows/os_windows.cpp

@@ -401,7 +401,6 @@ LRESULT OS_Windows::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 
 				mm->set_position(c);
 				mm->set_global_position(c);
-				input->set_mouse_position(c);
 				mm->set_speed(Vector2(0, 0));
 
 				if (raw->data.mouse.usFlags == MOUSE_MOVE_RELATIVE) {
@@ -508,7 +507,6 @@ LRESULT OS_Windows::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 						SetCursorPos(pos.x, pos.y);
 					}
 
-					input->set_mouse_position(mm->get_position());
 					mm->set_speed(input->get_last_mouse_speed());
 
 					if (old_invalid) {
@@ -652,7 +650,6 @@ LRESULT OS_Windows::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 				SetCursorPos(pos.x, pos.y);
 			}
 
-			input->set_mouse_position(mm->get_position());
 			mm->set_speed(input->get_last_mouse_speed());
 
 			if (old_invalid) {
@@ -754,7 +751,6 @@ LRESULT OS_Windows::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 				SetCursorPos(pos.x, pos.y);
 			}
 
-			input->set_mouse_position(mm->get_position());
 			mm->set_speed(input->get_last_mouse_speed());
 
 			if (old_invalid) {

platform/x11/os_x11.cpp

@@ -2828,7 +2828,6 @@ void OS_X11::process_xevents() {
 				mm->set_button_mask(get_mouse_button_state());
 				mm->set_position(posi);
 				mm->set_global_position(posi);
-				input->set_mouse_position(posi);
 				mm->set_speed(input->get_last_mouse_speed());
 
 				mm->set_relative(rel);