Re: modey vs 13h

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2 total messages Started by Cyberman Sat, 08 Aug 1992 03:11

#497

Author: Cyberman
Date: Sat, 08 Aug 1992 03:11

34 lines
1731 bytes

     -=> Sl8nl@cc.usu.edu spoke of "Re: modey vs 13h" <=-
    To All at 08-06-92  21:52
 > i have found that Mode X is easily fast enough if you use the latches
 > and copy from screen memory (page 3 or 4) to screen memory, and then
 > flip the pages.  

 Sl> That is, if you have the memory to laoad everything into screen
 Sl> memory. 
 Sl> Question:  As far as I can tell, Wolf3d does not store all of its
 Sl> images is screen memory (they wouldn't fit...lessee 64x64=4096 bytes,
 Sl> dividing 256k by it...).  OK, the perspective mapping routine is

Never fit! hehehe  Considering the swap file is 708k!  It loads
in only those images that are needed.  That is ONLY walls and
such, the objects {guards plants lamps dogs etc} are likely to be
bitblt from memory.

 Sl> probably written to map directly to screen memory.  It is an easy
 Sl> conversion on mine...you just have to change planes.  Is this true?

Let me get this straight.  You use planes 1 and 2 for fliping
images so that the screen doesn't flicker and 3 and 4 for
storage?  That's cool :) I suspect Keen Duke etc does this only
in EGA 320x200x16.

I think I'll write a "test" program.

        Stephen Cyberman@Toz.Buffalo.NY.US
        Scripted at Fri  08-07-1992  11:13:35

... This BBS has achieved Air superiority.
--- Blue Wave/QWK v2.10

Re: modey vs 13h

#520

Author: sl8nl
Date: Sat, 08 Aug 1992 19:13

22 lines
1500 bytes

>  Sl> probably written to map directly to screen memory.  It is an easy
>  Sl> conversion on mine...you just have to change planes.  Is this true?
> 
> Let me get this straight.  You use planes 1 and 2 for fliping
> images so that the screen doesn't flicker and 3 and 4 for
> storage?  That's cool :) I suspect Keen Duke etc does this only
> in EGA 320x200x16.

I'm disappointed in you...you never thought of that!!! :) (just kidding).
On something like that, it would work.  If you were writing a Duke Nukum
game, the setting would be perfect for this...only they would have more
than pages 1-4 to work with (lessee, 320x200=64000/2 pixels per byte,
32000, 256000/32000 = 8 pages).  On the EGA, this works well...they have
double the storage.

Now, Commander Keen on a VGA (if it were VGA) could only have 2 pages.
Period.  In fact, there would be no room in VGA memory after this (i.e.
you have to have something to pan onto...I've written something like
this before).  However, on an EGA...you would have your 2 scrolling
pages, and 4 more pages on top of that!!!

Josh

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