Re: SS20 cg14 help

[Michael <macallan%netbsd.org@localhost>]

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Hello,

On Aug 5, 2009, at 2:36 AM, der Mouse wrote:

> > I talked to someone who designed graphics chips at Sun, unfortunately
> > he didn't design the SX and I've been unable to contact the person
> > who did.
>
> :(  Still, that's more info than I've found. :-/

Well, someone else established the contact.

> > > I actually meant, like the cg6 in that we have no docs on the
> > > interesting parts, not in any other respect.
> > Well, we know enough about the cg6 to make it useful ( as in
> > accelerated console, accelerated X ), unlike the SX.
>
> True - well, true if you consider it not "useful" if you can't get
> faster than dumb-framebuffer speeds.  I find 8bpp windows on the cg14
> fast enough to be useful, while 24bpp is painful - but having 24bpp
> available on the same screen is very nice.

Well, cg14 and SX are different things. We know enough to make the  
cg14 useful but not the SX.

> > Btw. some kind soul finally sent me an S24 - I've been reading your
> > description of the hardware and it looks like it will be enough to
> > write a kinda-sorta accelerated X driver ( fills, simple copies and
> > colour expansion, apparently that's all we can get out of the
> > hardware ).
>
> Yeah, the acceleration is pretty rudimentary, but should be faster  
> than
> dumb framebuffer operations by a factor of somwhere between 2 and 32,
> depending on exactly what the operation is, if memory left over from
> last time I looked at the S24 is accurate.

Yeah, still better than nothing. Looks like at that time Sun was  
playing with different, non-traditional ways to do graphics  
acceleration.

> > Do you know what exactly is the difference between S24 and 8bit tcx?
> > Can I treat the tcx like a retarded S24 with only the 8bit
> > framebuffer?
>
> I don't know.  It might be worth trying that to see if it works; I
> haven't done so myself - in fact, I dojn't think I've played with the
> 8bit tcx at all.

I don't even have an 8bit tcx.

have fun
Michael

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