linux-kernel - Re: FF layer restrictions [Was: [PATCH 1/1] Input: add sensable phantom driver]

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Message-ID: <20070316162858.GB3951@ucw.cz>
Date:	Fri, 16 Mar 2007 16:28:59 +0000
From:	Pavel Machek <pavel@....cz>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Jiri Slaby <jirislaby@...il.com>,
	johann deneux <johann.deneux@...il.com>,
	Linux kernel mailing list <linux-kernel@...r.kernel.org>,
	linux-input@...ey.karlin.mff.cuni.cz,
	Anssi Hannula <anssi.hannula@...il.com>
Subject: Re: FF layer restrictions [Was: [PATCH 1/1] Input: add sensable phantom driver]

Hi!

> >Why did you remove all Cced people? Anyway I filtered 
> >some of them out
> >
> >johann deneux napsal(a):
> >> You are right, the direction in ff_effect is meant to 
> >be an angle.
> >> A dirty solution would be to use the 16 bits as two 
> >8-bits angles. Or
> >
> >That would be a problem as I need 3x 16bits.
> >
> >> maybe we should change the API. I don't think there 
> >are many
> >> applications using force feedback yet, so maybe that 
> >should be ok?
> >>
> >> If we change the API, we should remove the assumption 
> >that a device has
> >> at most two axes to render effects. We could for 
> >instance have a
> >> magnitude argument for each axis which is capable of 
> >rendering effects.
> >> That might be necessary even for more common gaming 
> >devices like racing
> >> wheels: One can think pedals could also be capable of 
> >force feedback
> >> some day, not just the steering wheel.
> >
> >I can do that, but in that case, I need to know how 
> >people (especially those
> >input one) want me to do...
> >
> 
> Since we have no idea how many programs (if any) are 
> using force
> feedback interface I would be wary of changing existing 
> effcets and
> rather add new set of 3D effects.
> 
> Do we have any idea if there any users of FF out there?

Number of linux games is quite low, so...

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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