From:	"Graham Reeds" <grahamr AT dtn DOT ntl DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	VBE2.0 w/LFB + GCC
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Message-ID:	<6v%E5.29784$L12.598411@news2-win.server.ntlworld.com>
Date:	Wed, 11 Oct 2000 16:17:04 +0100
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

Hi.  I'm having problems with my code (why else would I be posting here..:-)

After lots of tweaking and hacking at my code, swapping various lines of
code, and what-have-you I finally got it so it doesn't balk when I use
_dosmemputl() to flip images to the screen via the LFB.  The code is a bit
long, so I haven't posted it all here, only the few lines that are relevant.
The rest of the source is available from my homepage at
http://homepage.dtn.ntl.com/grahamr/vbe2.0.zip

/* FLIPS THE SCREEN */
void            frameendlfb()
  {
  /* wait for retrace */
  vsync();

  /* copy to lfb */
  _dosmemputl(primarysurface->dsimage, remainder, videomemory);

  return;
  }

/*
** CODE FRAGMENT FROM SETVBEMODE()
*/
    /* vbe >2.0 */
    /* check for lfb */
    if (modeinfoblock.modeattributes & 0x08)
      {
      /* lfb available */
      mode += 0x4000;

      /* get videomemory address */
      meminfo.size = (unsigned long)(modeinfoblock.bytesperscanline *
modeinfoblock.yresolution);
      meminfo.address = (unsigned long)modeinfoblock.physbaseptr;
      __dpmi_physical_address_mapping(&meminfo);
//      __dpmi_lock_linear_region(&meminfo);
      videomemory = meminfo.address;

      /* try selectors */
//      videoselector = __dpmi_allocate_ldt_descriptors(1);
//      __dpmi_set_segment_base_address(videoselector, videomemory);
//      __dpmi_set_segment_limit(videoselector,
modeinfoblock.bytesperscanline * modeinfoblock.yresolution + 1);

      /* set up lfb frameend() */
      remainder = (modeinfoblock.bytesperscanline *
modeinfoblock.yresolution) / 4;
      frameend = &frameendlfb;
      }

It compiles perfectly, but unfortunately when it flips it doesn't display
anything.  It is supposed to display a poo startfield with a crap purple
face that bounces around.  Any help would be appreciated.

P.S.  Relevant machine specs are P300MMX (yes a P55C o/c to 300), 64mb Ram,
S3 ViRGE/DX.

--

Stay Lucky, Graham "Mournblade" Reeds.
ICQ No.:  30514803
http://homepage.dtn.ntl.com/grahamr

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