From: eglebbk AT phys DOT uva DOT nl (Evert Glebbeek)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Using (page-flipping) to speed up a program
Date: Sat, 08 Jul 2000 12:55:51 GMT
Organization: Physics student, University of Amsterdam
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Newsgroup: comp.os.msdos.djgpp
 From: "23yrold3yrold" <cbarry AT pangea DOT ca>
 On Fri, 7 Jul 2000 11:23:29 -0500

>
>>>I found that info program
>> >but it doesn't seem to have anything in it about checking to see if
>> >triple-buffering or page-flipping will work on my computer.
>
>> IIRC, the program lists GFX_CAPABILITIES flags somewhere. One of them
>> should be GFX_CAN_TRIPLE_BUFFER.
>
>I noted the mention of those flags in the Allegro docs, but I don't know how
>to access them. If they're in that Info program they're hidden but good (at
>least to dense little old me :). Are they for reference or can they be
>manipulated somehow?( turn GFX_CAN_TRIPLE_BUFFER on/off?)
No, the flags are turned on by the Allegro code to show what the
graphics is capable of. You have to & the flags to the
gfx_capabilities variable.
Anyway, I've completed my small demo program that shows multiple
screen update methods. It's too long to post here, so I've uploaded it
to the following address:
http://www.science.uva.nl/~eglebbk/download/SCRNUPD.ZIP
it also uses the gfx_capabilities flag, so it should also illustrate
how to use that. If you have problems with it, feel free to ask.

Regards,

Evert Glebbeek.