From:	"Chaos" <chengin AT alpha DOT net DOT pl>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: fprintf() and using under graphic modes
Date:	Wed, 24 Nov 1999 13:25:34 +0100
Organization:	Chaos Engine
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Shawn Hargreaves napisał(a) w wiadomości: ...
>Eli Zaretskii writes:
>> If your BIOS supports text output in the graphics
>> mode you are using, it will work.
>
>Yup. But in my experience only about 50% of VESA implementations have
>that support, so it is a bad thing to rely on.
>
>> One way of telling if the particular mode is supported by the BIOS is
>> to call the DJGPP functions ScreenRows() and ScreenCols() and compare
>> their results with the number of text rows and columns for the
>> graphics mode you switched into (which you need to know in advance).
>
>I think it would be more robust to read this directly from the VESA
>driver: this can be found in the mode information structure, where
>the ModeAttributes field will have bit 2 set if TTY output is available.
>As a quick test, run the Allegro "vesainfo -v" program, and see whether
>it prints "tty" as part of the ModeAttributes value for the resolution
>you are interested in.

That's a very valuable information!!
Thank you very much for that. All is need to be done is to check if this
condition is true, and then decide to use fprintf or
self_made_drawing_texts_func.

>
>
> Shawn Hargreaves.

3mcie sie.
-=| Chaos |=-
e-mail:  chengin AT alpha DOT net DOT pl
              chengin AT polbox DOT com
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