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Article #3244

Re: Framebuffer performance

#3244
From: Craig Dewick
Date: Sat, 21 Dec 1996 00:00
44 lines
2817 bytes
In <1996Dec20.170055.11209@picarefy.picarefy.com> jwbirdsa@picarefy.picarefy.com (James W. Birdsall) writes:

>In article <594n3c$255@lios.apana.org.au> cdewick@lios.apana.org.au (Craig Dewick) writes:
>>The cg12 is a 24-bit colour framebuffer. Like all of Sun's 24-bit products
>>(there were P4-bus cards, and the cg9 VME bus card, as well as the Sbus
>>cg12), they are supported in the version(s) of X/openwindows supplied with
>>the various releases of SunOS/Solaris. 

>   As far as I know, the cgnine was never supported by OpenWin. There's a
>note in the FE manual that it isn't supported in OpenWin 2, and I've heard
>from folks running 3.x that it isn't supported there either.

Ok, I wasn't aware of that since I don't run OpenWindows here.

>>If you grab the X source distribution
>>from ftp.x.org, it doesn't support any of Sun's 24-bit frame buffers - only
>>the raw cg3/4's, and the cg6 line, are supported with code that works.

>   Actually, the P4-based 24-bit cgeight is supported in X11R6. The patch
>to support cgnines gloms onto the cgeight code since they're fairly close
>(if you ignore all the acceleration hardware on the cgnine *sigh*).

Yeah, but the cg8 code never worked, at least not for me. I had a 501-1371
P4-bus cg8 here at one stage, and the Xserver was always core-dumping as
soon as it tried to talk to the frame buffer to initialise it. So I gave up
on that idea. I presume that X11R6.1, and future releases of R6 and the
forthcoming R7 are unlikely to ever see support for other 24-bit devices
like the Sbus cg12's.

Once when I did contact the X Consortium about 24-bit frame buffer support
the response was that since they don't have any Sun machines with 24-bit
display hardware, they can't develop 24-bit Xserver hardware code for Sun's
and include it with the core distribution. The cg8 code that *is* in the R6
distribution doesn't have seem to have their endorsement, even though it was
included.

Regards,

Craig.
-- 
            Craig Dewick. Send email to 'cdewick@lios.apana.org.au'
   Point a web browser at 'http://lios.apana.org.au/~cdewick/sun_ark.html' to
       access my collection of Sun information and links to other places.
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From: cdewick@lios.apana.org.au (Craig Dewick)
Subject: Re: Framebuffer performance
Date: 1996/12/21
Message-ID: <59f34c$3lp@lios.apana.org.au>
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references: <592ta3$2ni@usenet.rpi.edu> <594n3c$255@lios.apana.org.au> <1996Dec20.170055.11209@picarefy.picarefy.com>
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