I'm having trouble with a VIO call from BCOS/2 V1.0, I am trying to set
the palette in an OS/2 full screen session in mode 13 (320x200x256) and
every time I make the VioSetState call, I get the return
ERROR_VIO_INVALID_LENGTH.  I have tried it with the video buffer
locked and unlocked and it doesn't make any difference.  I'm
running a ET4000W32i video card with OS/2 2.11 if that makes any
difference.  I have checked that viocreg.cb=12 (which it is supposed
to.) Here's the code I'm using which I got off of this echo I believe
...

void VGASetAllPalette(char *palette, int size) {
  VIOCOLORREG viocreg;

  viocreg.cb = sizeof(VIOCOLORREG);
  viocreg.type = 3; /* Apparently no #define for this */
  viocreg.firstcolorreg = 0;
  viocreg.numcolorregs = size;

  /* Note: viocreg.colorregaddr should be of type CHAR *_Seg16
     But it isn't! Hence if I say viocreg.colorregaddr = buf,
     then the correct thunking will not be applied! */
  memcpy(&viocreg.colorregaddr, palette, 4);

  VioSetState(&viocreg, (HVIO) 0);
};

The good news is that my frame rate went up about 50% just by compiling
under OS/2 rather than DOS - Yay!

Rob.
___
 X SLMR 2.1a X I haven't lost my mind...it's backed up on tape somewhere

--- Maximus/2 2.01wb