08052: radm, radmu: Steering randomly fails auto-centering

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08052	DIP/Input	Major	Always	Aug 15, 2021, 02:25	Aug 25, 2021, 22:13

Tester	ICEknight	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Bugs That Aren't Bugs	OS	Windows 10 (64-bit)
Status [?]	Resolved			Driver	sega/segas32.cpp
Version	0.234	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	08052: radm, radmu: Steering randomly fails auto-centering
Description	When using an analog controller. the steering wheel will fail to auto center half of the times after steering all the way to the left or right, making the game unplayable.
Steps To Reproduce	- F2 to enter test menu - Press "9" five times and then "F2", to enter the Input Test - Press the analog stick all the way to the left or right and release it many times
Additional Information
Github Commit

Flags
Regression Version
Affected Sets / Systems	radm, radmu

Attached Files	0000.png (28,662 bytes) Aug 15, 2021, 02:25 Uploaded by ICEknight

No.19145 ICEknight Tester Aug 15, 2021, 02:28	I didn't have any artwork active when I took the screenshot with F12, so no idea why it's showing.
No.19147 hap Developer Aug 15, 2021, 09:04	Maybe a BTANB? Since it only happens when you steer impossibly fast. I say impossibly because it won't be doable on the real game steering wheel. Namco Rave Racer on MAME is picky about it too. (F12 screenshot has its own video option settings)
No.19160 Tafoid Administrator Aug 20, 2021, 19:51	I tend to side with HAP on this instance. There are other examples of dials and trackball settings causing emulation to go "off the rails" when values are changes in larger increments than expected. Keeping in mind the original arcade and the input it expects, it is a reasonable assumption that you change values in a way that is unexpected. Autocenter is largely a function for those without Analog controls. If you use a mouse, for instance, you can move around and it doesn't auto center by design because it is precisely tuned to stay where you've moved it.
No.19163 dink Tester Aug 21, 2021, 13:46	Think of how a steering wheel on an arcade machine works - the game expects a perfect linear movement in steering without huge jumps. The way I've dealt with this in radm, pdrift and a few other games is have the dial set a target and increment or decrement an accumulator to toward this target on a timer which reacts faster than someone could move the input device, but slow enough not to break the game. Perhaps MAME could use a "wheel" device that does something similar?
No.19173 Tafoid Administrator Aug 25, 2021, 22:13	I'll slip it in as a BTANB which keeps it open. If there is more information that comes to like with actual hardware tests, we can reverse it.