Path: utzoo!attcan!uunet!fernwood!decwrl!wuarchive!zaphod.mps.ohio-state.edu!uakari.primate.wisc.edu!aplcen!haven!wam!bchin
From: bchin@wam.umd.edu (Weiyuan W. Chin)
Newsgroups: comp.windows.ms
Subject: Re: Lava Flow simulator program
Message-ID: <1990Oct20.123851.21019@wam.umd.edu>
Date: 20 Oct 90 12:38:51 GMT
Sender: usenet@wam.umd.edu (USENET Posting)
Reply-To: bchin@is-next.umd.edu (Weiyuan W. Chin)
Organization: University of Maryland at College Park
Lines: 28

In-reply-to: garym@cognos.uucp@uunet.uu.net's message of 19 Oct 90 13:30:51 GMT

>> On 19 Oct 90 13:30:51 GMT, garym@cognos.uucp@uunet.uu.net (Gary Murphy) said:
>I noticed this about the WinFrac program posted earlier; why is it so       
>difficult to do colour cycles in ega?  I can see where an ega might need    
>to be full-screen, but the real FractInt has had EGA cycling for _years_.       
       
Windows 3.0 defines 20 static colors (in the case of EGA/VGA, 16) so that
system drawn objects such as the window borders, maximize/minimize buttons,
etc. are drawn properly.  There is a Windows function call -
WORD SetSystemPaletteUse(hDC, wUsage) that's supposed to allow the
programmer to change that palette (except black and white).  Unfortunately,
it's not supported by the current VGA driver...  and therefore I don't
think it's supported by the EGA driver either.  Therefore only display
drivers that support the Palette Manager (8514/A, Video 7 with 512k, and
several other Super VGA drivers) and those that support the above function
call can cycle the palette.

>--
>o | Gary Murphy
>  |------------------------------------------------------------------------
>o | uunet!mitel!cunews!cognos!garym         garym@cognos.uucp@uunet.uu.net
>  | Cognos Inc.      P.O. Box 9707 Ottawa K1G 3N3     (613) 738-1338 x5537
>o | "There are many things which do not concern the process" - Joan of Arc
--
Bill Chin
University of Maryland College Park
internet: bchin@cville.umd.edu