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From:	Patrick Steele <psteele AT conch DOT aa DOT msen DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: BCC2GRX and SVGA
Date:	Tue, 31 Oct 1995 21:11:23 -0500
Organization:	Msen
Lines:	40
References:	<470bfp$8h2 AT recepsen DOT aa DOT msen DOT com> <9510300714 DOT AA19577 AT zora DOT uni-kiel DOT de>
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On Mon, 30 Oct 1995, Hartmut Schirmer wrote:

> psteele AT conch DOT aa DOT msen DOT com (Patrick Steele) wrote:
> 
> >I'm trying to use BCC2GRX to compile, but BCC2GRX is based on the old 
> >Borland C++ 3.1 BGI which could not use SVGA mode (at least not 
> >640x480x256).  GRX by itself works fine on my system in SVGA mode.  I 
> >just need to know how to get BCC2GRX to initialize to SVGA.
> 
> With BCC2GRX you can use any available GRX mode. Just add one additional line
> to your code:
> 
>   gd = _YOUR_OLD_GD_SETUP_;
>   gm = _THE_OLD_MODE_SELECTION_;
> #ifdef __GNUC__
>   set_BGI_mode_whc(&gd, &gm, XRES, YRES, NC);
> #endif
>   initgraph(&gd, &gm, "");
> 
> and define the XRES, YRES and NC values.

The problem though is that my gd and gm parameters are not supported by 
BCC2GRX (because BCC2GRX was written for Borland C++ 3.1).  My app was 
written with Borland C++ 4.5 and the Borland 32-bit PowerPak.  The 
PowerPack had a 32-bit version of the BGI which included a gd parameter 
of 'TRIDENT256' and a gm of 'RES640x480'.  This gave me a SVGA display on 
my Trident card.  When running on other machines, I could use a gd value 
of 'VESA256' to autodetect the VESA card.

I'm either going to modify BCC2GRX to support the newer 32-bit BGI modes, 
or just convert the graphics calls to native GRX calls.  Either one 
however will take longer than I would like.

+-----------------------------------------------------------+
| Patrick Steele                     psteele AT mail DOT msen DOT com  |
| WWW                         http://www.msen.com/~psteele  |
+-----------------------------------------------------------+
| Check out QUAKE HQ! at http://www.msen.com/~psteele/quake |
+-----------------------------------------------------------+

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