From:	prefs AT my-deja DOT com
Newsgroups:	comp.os.msdos.djgpp
Subject:	vesa
Date:	Tue, 20 Jul 1999 12:20:47 GMT
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

Hi.

I have a little problem with my vesa routines They compile as they
should but when I run them they can't get information about some modes.
But when I run them with the "|more" after, they work just as they
should. I can't really figure out
whats going on please help.

/*Beginning of code*/
typedef struct
{
/*You'll have to paste in the vesa info structure here because I removed
it before posting this message*/
}VBEInfo;

typedef struct
{
/*You'll have to paste in the vesa mode info structure here because I
removed it before posting this message*/
}VBEModeInfo;

int vesaDetect(VBEInfo *vesaInfo)
{
 __dpmi_regs regs;

 strncpy(vesaInfo->VESASignature, "VBE2", 4);

 regs.x.ax = 0x4F00;
 regs.x.di = __tb & 0x0F;
 regs.x.es = (__tb >> 4) & 0xFFFF;
 dosmemput(vesaInfo, sizeof(VBEInfo), __tb);
 __dpmi_int(0x10, &regs);

 if(regs.h.ah)
 {
  printf("Failed getting VESAInformation\n");
  return -1;
 }

 dosmemget(__tb, sizeof(VBEInfo), vesaInfo);

 if(strncmp(vesaInfo->VESASignature, "VESA", 4) != 0)
 {
  printf("Weird Vesa Signature\n");
  return -1;
 }

 return 0;
}

int vesaModeInfo(unsigned short mode, VBEModeInfo *modeInfo)
{
 __dpmi_regs regs;

 regs.x.ax = 0x4F01;
 regs.x.cx = mode;
 regs.x.di = __tb & 0x0F;
 regs.x.es = (__tb >> 4) & 0xFFFF;
 dosmemput(modeInfo, sizeof(VBEModeInfo), __tb);
 __dpmi_int(0x10, &regs);

 if(regs.h.ah)
 {
  printf("Failed getting VESAModeInformation\n");
  return -1;
 }

 dosmemget(__tb, sizeof(VBEModeInfo), modeInfo);

 return 0;
}

int countModes(unsigned short *mode, VBEInfo *vesaInfo)
{
 int modes;
 unsigned long modePtr;

 _farsetsel(_dos_ds);
 modes = 0;
 modePtr = ((vesaInfo->VideoModePtr & 0xFFFF0000) >> 12) +
(vesaInfo->VideoModePtr & 0xFFFF);
 mode[modes] = _farnspeekw(modePtr);
 while(mode[modes] != 0xFFFF)
 {
        modes++;
        modePtr += 2;
        mode[modes] = _farnspeekw(modePtr);
 }

 return modes;
}

int main()
{
 unsigned short mode[1024];
 int modes, i;
 VBEInfo vinfo;
 VBEModeInfo minfo;

 vesaDetect(&vinfo);

 modes = countModes(mode, &vinfo);

 printf("Available Modes:\t%d\n",modes);
 for(i=0;i<modes;i++)
 {
        vesaModeInfo(mode[i], &minfo);
        printf("Mode Number:\t0x%-3X [%5dx%-6d%2dbpp]\n",
mode[i],minfo.XResolution, minfo.YResolution, minfo.BitsPerPixel);
 }

}

/*End of code*/

please reply to: thomas DOT p AT vh DOT volvo DOT se

Thanks in advance Thomas


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