Re: [9fans] new versions of graphics programs?

[okamoto@granite.cias.osakafu-u.ac.jp]

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doule-buffer..., it may get much speed performance.

I've been thinking of another possiblity to use Plan 9's layer and
transparent color to implement this.  However, I have not
so rigid knowledge of using "windowed" layer yet.  <sigh>

Kenji


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From: "Douglas A. Gwyn" <DAGwyn@null.net>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] new versions of graphics programs?
Date: Thu, 14 Sep 2000 08:14:05 GMT
Message-ID: <39C053B0.34E4007F@null.net>

okamoto@granite.cias.osakafu-u.ac.jp wrote:
> I wanted to delete the older rect. or
> circle without affecting the background image around it.

The standard solution is to double-buffer the display,
computing a totally fresh image in the new buffer.
Then you can either switch the display to that buffer
or else copy the changed bits to the single frame buffer.
I don't know how feasible this is under the new Plan 9
graphics model.
An alternative approach with modern PC graphics cards
is to build a (3D) model in the graphics card and let
the card's engines take care of the rendering.