From: "Silent Dreamer" <silentdreamer AT mail DOT telepac DOT pt>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Timeconsuming __dpmi_int  problem with pageflips!
Date: 21 Jul 1997 22:57:18 GMT
Lines: 31
Message-ID: <01bc9601$22b12660$LocalHost@nop44597>
References: <33cf809b DOT 147466 AT news DOT algonet DOT se>
NNTP-Posting-Host: etr1-p7.telepac.pt
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Precedence: bulk

> I use a linearframebuffer with near pointers. Fliping between two
> pages in the videomem can be done by function 0x4f07 using
> the int 0x10. It worked just fine until I started to do som heavy
> graphics routines.I could not belive that I couldn't draw more pixels
> on p120 in 320x240x24 so i ran gprof. Gprof shows the horrible
> truth that one single __dpmi_int takes near 50% of the cputime.


> Is there a faster way of flipping pages through vesa??

Yes, if you're using VBE20, i should use function 0x4F0A.
It gives you the pointers to those functions (SetDisplayStart, etc)

That way you can then call directlly, avoiding that way the __dpmi_int, and
the overhead of the int 10h.


> Is there a good doc available for the At&t assembler syntax??
> (It drives me kind of crazy with its mixture of Motorola/Intel syntax)

Try:
http://www.rt66.com/~brennan/djgpp/.
http://resourcium.com/.




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-- 
Silent Dreamer
silentdreamer AT mail DOT telepac DOT pt