From mboxrd@z Thu Jan  1 00:00:00 1970
From: erik quanstrom <quanstro@quanstro.net>
Date: Thu,  2 Aug 2012 10:48:19 -0400
To: 9fans@9fans.net
Message-ID: <187a6349f2ca9d4e435309038e567160@kw.quanstro.net>
In-Reply-To: <20120802114854.35f1bfb6@wks-ddc.exosec.local>
References: <981ee497-8f06-4e31-85da-b9c3a95601ca@j7g2000vbx.googlegroups.com>
	<20120802114854.35f1bfb6@wks-ddc.exosec.local>
MIME-Version: 1.0
Content-Type: text/plain; charset="US-ASCII"
Content-Transfer-Encoding: 7bit
Subject: Re: [9fans] Mouse acceleration under Plan 9
Topicbox-Message-UUID: a764ce4a-ead7-11e9-9d60-3106f5b1d025

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