From:	lonniem AT cs DOT utexas DOT edu (Lonnie McCullough)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Problem with linear video memory
Date:	Sat, 16 Aug 1997 00:49:01 GMT
Message-ID:	<33f4f869.1297602@news.nol.net>
References:	<5svlb3$auf AT news DOT xgw DOT fi>
NNTP-Posting-Host:	ip38-19.nol.net
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

On 14 Aug 1997 19:12:35 GMT, Sampo Niskanen <sampo AT lizard DOT compart DOT fi>
wrote:

>How can I make a selector to access the memory of a linear framebuffer
>(VESA VBE 2.0, __dpmi_set_selector doesn't work) and how can I write in
>it? When I try to write to it (with a selector which can access all 4GB
>of memory), it always segfaults. Is there something else to do than
>just to set a (vesa) videomode with bit 14 set and to check the position
>of the framebuffer to get a linear framebuffer?

In my graphics library there is a function that sets up a descriptor
to "point" at video memory.  If you go to
http://www.cs.utexas.edu/users/lonniem/src.zip and get it look in
src/surface.c in the routine screenallocate () to get the answers.


Lonnie McCullough
lonniem AT cs DOT utexas DOT edu

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