Re: using video-ram in mde 13h (ibm pc)

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#1170

From: John A. Slagel
Date: Wed, 11 Nov 1992 15:30

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s026@brems.ii.uib.no (Paal K Holmberg) writes:

> thanks for the response. if i have this right, i cant use other parts of the video
>ram than the 64k used by the screen in mode 13h.
 
    Correct. (By the way, keep your line size under 80 characters, please)

> I have a fair idea about how mode x works, but i didntt want to use it as i thought
>the polygon routines wold be slowed down by having to manage which bitplanes to write
>to. is this right ?

    Nope, this is entirely wrong... You can write 4 pixels in one MOVSB, if
    they're all the same color.  Michel Abrash published code in Doctor Dobb's
    Journal for a fast 3D graphics using modex. 

    If you have FTP access, check out on wuarchive.wustl.edu in
    the pub/mirrors/msdos/ddjmag/xsharp15.zip file.  This is the
    complete 3D graphics package, with source. It contains fast 
    polygon fill routines.

-- 
------------------------------------------------------------------------
  John A. Slagel, email: jas37876@uxa.cso.uiuc.edu

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From: jas37876@uxa.cso.uiuc.edu (John A. Slagel)
Newsgroups: rec.games.programmer
Subject: Re: using video-ram in mde 13h (ibm pc)
Message-ID: <BxK5rJ.9Ip@news.cso.uiuc.edu>
Date: 11 Nov 92 15:30:53 GMT
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