From:	Damian Yerrick <Bullcr_pd_yerrick AT hotmail DOT comRemoveBullcr_p>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: svga
Organization:	Pin Eight Software http://pineight.8m.com/
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NNTP-Posting-Date:	Wed, 07 Jun 2000 19:42:43 GMT
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Date:	Wed, 07 Jun 2000 19:42:43 GMT
To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

On Mon, 05 Jun 2000 22:22:35 -0400, Martell <crazy AT ne DOT infi DOT net> wrote:

>i would like to write the graphical functions myself, just for the
>knowledge of how they work, so using pre-written functions is not
>what im looking for here.

But you can still _look_ at working library functions to see how they
work.

>i already know how to allocate 307 kb and how to get into svga mode,
>switch banks

Bank switching is different on each video card; VESA tries to fix
this, but implementations are extremely buggy.

>but im having trouble transfering the buffer to the screen.  (64K at
>a time thanx to bank switching).

Instead of bank switching, you might want to look for VESA 2 linear
frame buffer.  It gives you one big bank (like the Mac does) that can
be up to 16 MB (given enough VRAM).

>anybody have any ideas/suggestions/comments/source code that might
>help me do this?

Look at the Allegro source:
  http://www.talula.demon.co.uk/allegro/
See how it works its magic, and write your own code to do the same.

-- 
Damian Yerrick
"I refuse to listen to those who refuse to listen to reason."
See the whole sig: http://www.rose-hulman.edu/~yerricde/sig.html

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