From:	"Anthony Graham" <News_Anthony AT Fonzyco DOT co DOT uk>
Newsgroups:	comp.os.msdos.djgpp
Subject:	A VESA Question
Date:	Sat, 25 Mar 2000 19:58:38 -0000
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

Is it possible to get Vesa mode info without DMPI or far pointers? I'm
trying not to use these. I went on the dj delorie site and got their vesa
source and tried to convert it (stop using dpmi and use int386/int386x) )
but it simply wont work!! If anyone can fix my code and e-mail me it back
i'd be most grateful, first is the dpmi version then is my attempt:


   typedef struct MODE_INFO
   {
      unsigned short ModeAttributes       __attribute__ ((packed));
      unsigned char  WinAAttributes       __attribute__ ((packed));
      unsigned char  WinBAttributes       __attribute__ ((packed));
      unsigned short WinGranularity       __attribute__ ((packed));
      unsigned short WinSize              __attribute__ ((packed));
      unsigned short WinASegment          __attribute__ ((packed));
      unsigned short WinBSegment          __attribute__ ((packed));
      unsigned long  WinFuncPtr           __attribute__ ((packed));
      unsigned short BytesPerScanLine     __attribute__ ((packed));
      unsigned short XResolution          __attribute__ ((packed));
      unsigned short YResolution          __attribute__ ((packed));
      unsigned char  XCharSize            __attribute__ ((packed));
      unsigned char  YCharSize            __attribute__ ((packed));
      unsigned char  NumberOfPlanes       __attribute__ ((packed));
      unsigned char  BitsPerPixel         __attribute__ ((packed));
      unsigned char  NumberOfBanks        __attribute__ ((packed));
      unsigned char  MemoryModel          __attribute__ ((packed));
      unsigned char  BankSize             __attribute__ ((packed));
      unsigned char  NumberOfImagePages   __attribute__ ((packed));
      unsigned char  Reserved_page        __attribute__ ((packed));
      unsigned char  RedMaskSize          __attribute__ ((packed));
      unsigned char  RedMaskPos           __attribute__ ((packed));
      unsigned char  GreenMaskSize        __attribute__ ((packed));
      unsigned char  GreenMaskPos         __attribute__ ((packed));
      unsigned char  BlueMaskSize         __attribute__ ((packed));
      unsigned char  BlueMaskPos          __attribute__ ((packed));
      unsigned char  ReservedMaskSize     __attribute__ ((packed));
      unsigned char  ReservedMaskPos      __attribute__ ((packed));
      unsigned char  DirectColorModeInfo  __attribute__ ((packed));
      unsigned long  PhysBasePtr          __attribute__ ((packed));
      unsigned long  OffScreenMemOffset   __attribute__ ((packed));
      unsigned short OffScreenMemSize     __attribute__ ((packed));
      unsigned char  Reserved[206]        __attribute__ ((packed));
   } MODE_INFO;


   MODE_INFO mode_info;


   int get_mode_info(int mode)
   {
      __dpmi_regs r;
      long dosbuf;
      int c;

      /* use the conventional memory transfer buffer */
      dosbuf = __tb & 0xFFFFF;

      /* initialize the buffer to zero */
      for (c=0; c<sizeof(MODE_INFO); c++)
  _farpokeb(_dos_ds, dosbuf+c, 0);

      /* call the VESA function */
      r.x.ax = 0x4F01;
      r.x.di = dosbuf & 0xF;
      r.x.es = (dosbuf>>4) & 0xFFFF;
      r.x.cx = mode;
      __dpmi_int(0x10, &r);

      /* quit if there was an error */
      if (r.h.ah)
  return -1;

      /* copy the resulting data into our structure */
      dosmemget(dosbuf, sizeof(MODE_INFO), &mode_info);

      /* it worked! */
      return 0;
   }


///////////////////////////NOW MY ATTEMPT//////////////////////////////
////////////////////////////////////////////////////////////////////////////
////////////////

    MODE_INFO mode_info;


   int my_get_mode_info(int mode)
   {
      union REGS r, ro;
      struct SREGS sr;
      char *dodo;
      long dosbuf;
      int c;

      /* use the conventional memory transfer buffer */
      dosbuf = __tb & 0xFFFFF;
      dodo=(char *)malloc(256);

      /* initialize the buffer to zero */
      /* call the VESA function */
//      r.x.ax = 0x4F01;
//     r.x.di = dosbuf & 0xF;
//      r.x.es = (dosbuf>>4) & 0xFFFF;
//      r.x.cx = mode;
        r.h.ah=0x4F;
        r.h.al=0x01;
        r.w.di= (long)dodo & 0xF;
        r.w.cx=mode;
        sr.es=((long)dodo>>4) &0xFFFF;
//        int386x(0x10, &r, &ro, &sr);
//      __dpmi_int(0x10, &r);


      /* copy the resulting data into our structure */
      memcpy(&mode_info,dodo, 256);

      /* it worked! */
      return 0;
   }





thanks!

-Anthony

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