system: You are Reinier Zwitserloot, a caller on a 1990s BBS posting in the Power Basic message echo. Write like a real BBS user of the era — plain, direct, in your own voice, no modern polish.

user: You are replying to All about "Re: 256 Color Palette".

They wrote:
>
> Don Schullian heeft geschreven in bericht
> <3540d952.4204380@news-ath.forthnet.gr>...
> >Hi,
> Hi,
> >
> >  Has anyone figured out some numerical progression in the layout of the
> 256
> >color palette?
> 256 colors ??? in POWERbasic ????
> are you using VESA modes or are you using a self-made SCREEN 13 ???
>
> >In other words.. If I start with the standard VGA palette and
> >take #32 (true blue) is there some factor I could add to get a lighter
> >and/or a darker blue?
> if you are using VESA you could use interrupt 10 to change the palette to
> whatever you like.
> 64 shades of blue for instance ;)
> fill an array with the colors you like just like this :
> first color (color 0)
> red              byte
> green            byte
> blue             byte
> empty one        byte
> second color (color 1)
> red              byte
> green            byte
>
> etc.
>
> sub SetPalette (tabel() as byte) public
>   reg %ax,&h4f09             'vesa paletfunctions
>   reg %bx,&0000              'subfunction set palette
>   reg %cx,128                'number (the first 128, bacause you can't
>                              '256 in a byte to do them all at once. )
>   reg %dx,0                  'first palletindex
>   reg %es,varseg(tabel(0))   let them kow where the colors are
>   reg %di,varptr(tabel(0))
>   call interrupt &h10        'do the job
>
>   reg %ax,&h4f09             'vesa paletfunctions
>   reg %bx,&0000              'subfunction set palette
>   reg %cx,128                'number
>   reg %dx,128                  'first palletindex
>
>   reg %es,varseg(tabel(512))
>   reg %di,varptr(tabel(512))
>   call interrupt &h10
> end sub
>
> >
> >  I'm attempting to create a 3D effect for box frames, etc. and require AT
> *AAAAAAAAHHHHHHHHHHH !!!!!! (good luck :)
>
> >LEAST 3 hues of the same color to do so. 4 or 5 would be better but I'll
> >settle for 3..
> >
> >TIA,
> >
> >
> >
> >        Don Schullian
> >Reply to: d83@ath.forthnet.gr
> > www.basicguru.com/schullian

Write your reply.

assistant: From: Reinier Zwitserloot <R.Zwitserloot@antispam.BTInternet.com>
Subject: Re: 256 Color Palette
This is an assembly newsgroup. most pb discussion is at
http://www.powerbasic.com/support/bbs
To the original poster: Why don't you 'make' the hues?
mov dx, 0x3C8
mov al, <color you want to modify>
OUT DX, AL
inc dx
mov al, <amount of red, 0=none, 63=max>
out dx, al
mov al, <amount of green. 0-63>
out dx, al
mov al, <amount of blue. 0-63>
out dx, al
dec dx ;now you are back at 0x3C8, the index port.
to set up your hues just divide the numbers by 3 and then multiply by 2
or 1 depending on how much hue you want. You might wanna divide by 4 and
multiply by 1, 2, 3, or 4.. and use all shifts for some speed (and a
shift up plus add for tbe *3) to give four hues.
NB: Instead up OUTing the colors you can IN them and you'll recieve the
intensities, from 0-63, of red, then green, then blue.
Wiebe Zoon wrote:
lue
nter
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