Message-ID: <3379F143.3D7F@geocities.com>
Date: Wed, 14 May 1997 19:07:16 +0200
From: Magnus Byrkjeflot <magnusb AT geocities DOT com>
MIME-Version: 1.0
To: djgpp AT delorie DOT com
Subject: Vesa sucks.... ??
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Hello!

I'm trying to write a VBE 2.0 library in C/djgpp, and I'm having some
problems with one of my routines.... I keep getting SIGABRT messages
when trying to run this routine in RHIDE.. It seems like the poke
routine screws something up... When the poke thingy is run for the third
time, I get this SIGABRT message.

I'm using UNIVBE 5.3 and a pentium machine with a ATI mach 64 card...

Here is the routine:

#define MASK_LINEAR(addr)     (addr & 0x000fffff)
#define RM_TO_LINEAR(addr)    (((addr & 0xffff0000) >> 12) + (addr &
0xffff))
#define RM_OFFSET(addr)       (MASK_LINEAR(addr) & 0xffff)
#define RM_SEGMENT(addr)      ((MASK_LINEAR(addr) & 0xffff0000) >> 4)

unsigned short vbe_getinfo(void)
{
   unsigned short loop1 = 0 ,buffer = 0;
   unsigned short vidmodeofs;

   vbe_r.x.ax=0x4f00;
   vbe_r.x.es=RM_SEGMENT(__tb);
   vbe_r.x.di=RM_OFFSET(__tb);
   _go32_dpmi_simulate_int(0x10,&vbe_r);

   dosmemget(__tb,sizeof(VBEInfoBlock),&VBEInfoBlock);

   vidmodeofs = RM_TO_LINEAR(VBEInfoBlock.VideoModePtr);

   while (buffer != 0xffff)
   {
      buffer = _farpeekw(_dos_ds,vidmodeofs);

      memset(&vbe_r,0,sizeof(vbe_r));
      vbe_r.x.ax=0x4f01;
      vbe_r.x.cx=buffer;
      vbe_r.x.es=RM_SEGMENT(__tb);
      vbe_r.x.di=RM_OFFSET(__tb);
      _go32_dpmi_simulate_int(0x10,&vbe_r);

      dosmemget(__tb,sizeof(ModeInfoBlock),&ModeInfoBlock[loop1]);
      ModeArray[loop1]=buffer;
      loop1++;
      vidmodeofs += 2;
   }
}

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// Vesa 2.0 routines

#include <dpmi.h>
#include <go32.h>
#include "vesa20.h"

#define MASK_LINEAR(addr)     (addr & 0x000fffff)
#define RM_TO_LINEAR(addr)    (((addr & 0xffff0000) >> 12) + (addr & 0xffff))
#define RM_OFFSET(addr)       (MASK_LINEAR(addr) & 0xffff)
#define RM_SEGMENT(addr)      ((MASK_LINEAR(addr) & 0xffff0000) >> 4)


unsigned short vbe_getinfo(void)
{
   unsigned short loop1 = 0 ,buffer = 0;
   unsigned short vidmodeofs;

   vbe_r.x.ax=0x4f00;
   vbe_r.x.es=RM_SEGMENT(__tb);
   vbe_r.x.di=RM_OFFSET(__tb);
   _go32_dpmi_simulate_int(0x10,&vbe_r);

   dosmemget(__tb,sizeof(VBEInfoBlock),&VBEInfoBlock);

   vidmodeofs = RM_TO_LINEAR(VBEInfoBlock.VideoModePtr);
//   printf("%s\n\r",(char**)(RM_TO_LINEAR(VBEInfoBlock.OemProductNamePtr));

   while (buffer != 0xffff)
   {
      buffer = _farpeekw(_dos_ds,vidmodeofs);

      memset(&vbe_r,0,sizeof(vbe_r));
      vbe_r.x.ax=0x4f01;
      vbe_r.x.cx=buffer;
      vbe_r.x.es=RM_SEGMENT(__tb);
      vbe_r.x.di=RM_OFFSET(__tb);
      _go32_dpmi_simulate_int(0x10,&vbe_r);

      dosmemget(__tb,sizeof(ModeInfoBlock),&ModeInfoBlock[loop1]);
      ModeArray[loop1]=buffer;
      loop1++;
      vidmodeofs += 2;
   }
}

unsigned short vbe_setmode(unsigned short vbe_mode, char linear)
{
   vbe_r.x.ax=0x4f02;
   vbe_r.x.bx=ModeArray[vbe_mode];
   if (linear) vbe_r.x.bx=vbe_r.x.bx | 0x4000;
   _go32_dpmi_simulate_int(0x10,&vbe_r);

   FrameBuffer = __dpmi_allocate_ldt_descriptors(1);
   __dpmi_set_segment_base_address(FrameBuffer,ModeInfoBlock[vbe_mode].PhysBasePtr);
   __dpmi_set_segment_limit(FrameBuffer,ModeInfoBlock[vbe_mode].OffScreenMemSize*1000);
   return(vbe_r.x.ax);
}

unsigned short vbe_returncurrentmode()
{
   vbe_r.x.ax=0x4f03;
   _go32_dpmi_simulate_int(0x10,&vbe_r);
   return(vbe_r.x.bx);
}



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