* [9fans] Mouse acceleration under Plan 9
@ 2012-08-02 8:57 Brian Vito
2012-08-02 9:09 ` Rudolf Sykora
2012-08-02 9:48 ` David du Colombier
0 siblings, 2 replies; 6+ messages in thread
From: Brian Vito @ 2012-08-02 8:57 UTC (permalink / raw)
To: 9fans
If you'll excuse another question from a non-programmer, does Plan 9
use a mouse pointer acceleration algorithm (if so, where would it be
documented?) or is it 1:1? Thanks so much.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [9fans] Mouse acceleration under Plan 9
2012-08-02 8:57 [9fans] Mouse acceleration under Plan 9 Brian Vito
@ 2012-08-02 9:09 ` Rudolf Sykora
2012-08-02 9:48 ` David du Colombier
1 sibling, 0 replies; 6+ messages in thread
From: Rudolf Sykora @ 2012-08-02 9:09 UTC (permalink / raw)
To: Fans of the OS Plan 9 from Bell Labs
On 2 August 2012 10:57, Brian Vito <brian.vito@gmail.com> wrote:
> If you'll excuse another question from a non-programmer, does Plan 9
> use a mouse pointer acceleration algorithm (if so, where would it be
> documented?) or is it 1:1? Thanks so much.
>
Having read the section 12.3 of `Introduction to Operating systems
Abstractions Using Plan9 from Bell Labs' by F J Ballesteros, I believe
there is some acceleration available.
Ruda
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [9fans] Mouse acceleration under Plan 9
2012-08-02 8:57 [9fans] Mouse acceleration under Plan 9 Brian Vito
2012-08-02 9:09 ` Rudolf Sykora
@ 2012-08-02 9:48 ` David du Colombier
2012-08-02 14:48 ` erik quanstrom
1 sibling, 1 reply; 6+ messages in thread
From: David du Colombier @ 2012-08-02 9:48 UTC (permalink / raw)
To: 9fans
> If you'll excuse another question from a non-programmer, does Plan 9
> use a mouse pointer acceleration algorithm (if so, where would it be
> documented?) or is it 1:1? Thanks so much.
Yes. See mouse(3) and /sys/src/9/port/devmouse.c.
--
David du Colombier
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [9fans] Mouse acceleration under Plan 9
2012-08-02 9:48 ` David du Colombier
@ 2012-08-02 14:48 ` erik quanstrom
2012-08-03 1:21 ` cinap_lenrek
0 siblings, 1 reply; 6+ messages in thread
From: erik quanstrom @ 2012-08-02 14:48 UTC (permalink / raw)
To: 9fans
On Thu Aug 2 05:50:03 EDT 2012, 0intro@gmail.com wrote:
> > If you'll excuse another question from a non-programmer, does Plan 9
> > use a mouse pointer acceleration algorithm (if so, where would it be
> > documented?) or is it 1:1? Thanks so much.
>
> Yes. See mouse(3) and /sys/src/9/port/devmouse.c.
however, i've found /hardware/ mouse acceleration to be a mistake.
at least some kvm eat or mangle these commands, which motiviated
me to consider the issue, and i don't see a reason why the kernel
shouldn't just do the acceleration (multiplication) itself. surely one
multiply should be of no concern on a 100Mhz+ computer.
:-)
the code's in the 9atom kernel, fwiw.
- erik
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [9fans] Mouse acceleration under Plan 9
2012-08-02 14:48 ` erik quanstrom
@ 2012-08-03 1:21 ` cinap_lenrek
2012-08-03 1:28 ` erik quanstrom
0 siblings, 1 reply; 6+ messages in thread
From: cinap_lenrek @ 2012-08-03 1:21 UTC (permalink / raw)
To: 9fans
probably more a resolution thing than the cost of a
multiplication.
kernel gets only deltas at some fixed sample intervals
where the mouse can do it for every encoder cycle.
(no clue how its really done or with optical mice, touchpads
or trackpoints...)
but kernels software mouse acceleration works good
enougth, so we also have it enabled by default instead
of using the hardware one (which caused problems with
some mice on laptops).
--
cinap
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [9fans] Mouse acceleration under Plan 9
2012-08-03 1:21 ` cinap_lenrek
@ 2012-08-03 1:28 ` erik quanstrom
0 siblings, 0 replies; 6+ messages in thread
From: erik quanstrom @ 2012-08-03 1:28 UTC (permalink / raw)
To: 9fans
On Thu Aug 2 21:25:21 EDT 2012, cinap_lenrek@gmx.de wrote:
> probably more a resolution thing than the cost of a
> multiplication.
the multiplication is not linear. cf. dztab, so there is no
resolution tradeoff for slow/small movements.
- erik
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2012-08-03 1:28 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2012-08-02 8:57 [9fans] Mouse acceleration under Plan 9 Brian Vito
2012-08-02 9:09 ` Rudolf Sykora
2012-08-02 9:48 ` David du Colombier
2012-08-02 14:48 ` erik quanstrom
2012-08-03 1:21 ` cinap_lenrek
2012-08-03 1:28 ` erik quanstrom
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