From: Theo Honohan <theoh@chiark.greenend.org.uk>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] Re: moving things in a window
Date: Thu, 28 Sep 2000 12:28:55 +0100 [thread overview]
Message-ID: <E13ebrz-0007Qm-00@chiark.greenend.org.uk> (raw)
In-Reply-To: Your message of "Thu, 28 Sep 2000 10:18:48 GMT." <39D23579.265E60B8@arl.army.mil>
In message <39D23579.265E60B8@arl.army.mil>, "Douglas A. Gwyn" writes:
> andrey mirtchovski wrote:
> > ... So the mask says ``only draw where the old circle was
> > but the new circle is not''.
> > The final draw puts white down in those places.
>
> Of course, that clobbers other objects in the same (old) location.
> I know of no way to do this right without taking into account all
> potentially visible objects. If the hardware can help (Z-buffer,
> or render a model) that's great.
For hardware acceleration, it looks like you'd have to extend the draw
protocol with something equivalent to GLX.
I'm not sure yet whether explicit support for double buffering, on its
own, would be a useful addition. (See my previous message.)
Keith Packard's "render" mailing list has seen some hard-hitting
discussion of these and related issues recently.
http://XFree86.Org/mailman/listinfo/render
next prev parent reply other threads:[~2000-09-28 11:28 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-09-26 17:00 Theo Honohan
2000-09-26 17:15 ` andrey mirtchovski
2000-09-26 18:00 ` Theo Honohan
2000-09-28 10:18 ` Douglas A. Gwyn
2000-09-28 11:28 ` Theo Honohan [this message]
2000-09-29 8:31 ` Douglas A. Gwyn
2000-09-27 0:08 okamoto
2000-09-27 0:19 ` Theo Honohan
2000-09-27 0:17 okamoto
2000-09-27 0:30 okamoto
2000-09-27 0:35 rob pike
2000-09-27 6:27 okamoto
2000-09-29 12:35 Russ Cox
2000-10-02 9:00 ` Douglas A. Gwyn
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