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- From: sk@jenny.informatik.uni-dortmund.de (Stefan Kirchberg)
- Newsgroups: comp.windows.x.i386unix
- Subject: Re: 32K or 16M colours?
- Date: 23 Dec 1992 13:19:56 GMT
- Organization: CS Department, Dortmund University, Germany
- Lines: 52
- Sender: sk@jenny (Stefan Kirchberg)
- Distribution: world
- Message-ID: <1h9p1sINNlsb@fbi-news.Informatik.Uni-Dortmund.DE>
- References: <linda.724803368@minnie> <1992Dec20.000426.21774@cbnewsj.cb.att.com> <1992Dec22.130619.18414@news.lrz-muenchen.de>
- NNTP-Posting-Host: jenny.informatik.uni-dortmund.de
-
- In article <1992Dec22.130619.18414@news.lrz-muenchen.de>,
- roell@informatik.tu-muenchen.de (Thomas Roell) writes:
- |> >> If they are (which I doubt) they would be riciculously slow. Also
- |> >> since they usually trade resolution for pixel depth that means X on
- |> >> something like 640x480 (yuck!).
-
- <see below>
-
- |> >Take a look at how the 24-bit SVGA's are implemented. Packed 3-byte
- |> pixels.
- |> >It's going to make working on them rediculous.
- |>
- |> I don't think 3byte pixels is that rediculus if you look at the memory
- |> contraints given in todays SVGAs. But the price to pay is VERY high.
-
- What about aligning them on 32bit boundaries and decoding only three bytes
- each?
- Of course, that would result in more memory banks.
-
- But that is not the point since these cards are existing, and all of them have
- this style of decoding 3 bytes per pixel --- new ones are likely to do it the
- same way :-|
-
- But then, it would even be an interesting opportunity to switch from the X11
- desktop to a true color 640x480 screen, do some graphics there and switch over
- back to X11. With M******** W****** that's possible, it redraws the whole
- screen
- and _even_does_not_crash_ (so far..). So I wonder if there is a way to
- perform my
- raytracing on Linux with true color while still using X11. The point is: it
- would
- not be neccessary to have a real X11 desktop with 16M colors, not even the
- X11
- graphics primitives are strictly required. It should only be possible to
- suspend
- X11 from controlling the screen. Switching back and forth while both
- screens
- modes are in use would be luxury (and nice because of using a debugger ;-),
- but
- that would require storing the contents elsewhere and restoring them when
- switching.
-
- Stefan
-
- --
- Stefan Kirchberg sk@irb.informatik.uni-dortmund.de
- Computer Science Department - IRB Tel. from inside UniDO: 4700
- University of Dortmund from outside: 0231/755-2422
- W-4600 Dortmund 50,PO-Box 500500, Germany Office: GB V/R.325
-
-
-
-