From: "Peter Remmers" <Peter DOT Remmers AT t-online DOT de>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: VBE2.0 w/LFB + GCC
Date: Fri, 13 Oct 2000 15:42:41 +0200
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To: djgpp AT delorie DOT com
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Graham Reeds <grahamr AT dtn DOT ntl DOT com> schrieb...

>       /* get videomemory address */
>       meminfo.size = (unsigned long)(modeinfoblock.bytesperscanline *
> modeinfoblock.yresolution);

Why not use something like vesainfo.memsize * 0x10000?
This way you get the whole memory of your graphic card, so you can
access off-screen memory, too.

>       meminfo.address = (unsigned long)modeinfoblock.physbaseptr;
>       __dpmi_physical_address_mapping(&meminfo);
>       __dpmi_lock_linear_region(&meminfo);

Video RAM is not system RAM. The DPMI host cannot page it to disk,
it's always there. No need to lock it.

>       videomemory = meminfo.address;
>
>       /* try selectors */
>       videoselector = __dpmi_allocate_ldt_descriptors(1);
>       __dpmi_set_segment_base_address(videoselector, videomemory);
>       __dpmi_set_segment_limit(videoselector,
modeinfoblock.bytesperscanline
> * modeinfoblock.yresolution);

The limit you must specify here is the highest accessible offset, so it must
be size-1.

>       remainder = (modeinfoblock.bytesperscanline *
> modeinfoblock.yresolution) / 4;
>       frameend = &frameendlfb;
>
> And the new blitting function looks like:
>
>  _movedatal(_my_ds(), (unsigned int)primarysurface->dsimage,
videoselector,
> 0x00, remainder);

As far as I can see, this is now correct and should work.

> Everything works fine, and the numbers are right. So now what's the
problem?

So, what's the problem if you say everything works fine?

Peter