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/
Message-ID: <cqoojs0fugtp2nl95qglc32p1n3341c5rb@4ax.com>
References: <393A97A6 DOT 68C0EB6 AT ne DOT infi DOT net> <393A9867 DOT 8872DAEE AT it-he DOT org> <8heat2$cho$1 AT supernews DOT com> <393C606A DOT 174FA10D AT ne DOT infi DOT net>
X-Newsreader: Forte Agent 1.7/32.534
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Lines: 36
X-Trace: /bCCZGA/bwdI+6eHiSpkWrs8KlcIHqgI0WfhnKn0apQUydPHaMKSHk1gJpD0Ly9inNSRW17eKeO8!MMYl/Y4Xh22JyI0Lf9sIy8LDWM3UFFK2yOhIBJYm4AabOXxNcsm5kVpcX4jZPBO/IMw6Ly//sO1+!fcQc
X-Complaints-To: abuse AT gte DOT net
X-Abuse-Info: Please be sure to forward a copy of ALL headers
X-Abuse-Info: Otherwise we will be unable to process your complaint properly
NNTP-Posting-Date: Wed, 07 Jun 2000 19:42:43 GMT
Distribution: world
Date: Wed, 07 Jun 2000 19:42:43 GMT
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
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

This is McAfee VirusScan. Add these two lines to your signature to
prevent the spread of signature viruses.  http://www.mcafee.com/