🚀 go-pugleaf

In <1992Aug20.141357.20611@alw.nih.gov> gregh@alw.nih.gov (Gregory Humphreys) writes:

>Okay.  I want to write to SVGA memory without using BIOS calls on my 486.  I can do it great with int 10, but it's slow as all hell.  What is happening is after I calculate the address for the VRAM, everything is getting modded into the top 64k of VRAM (one display pages worth, I guess).  Imagine the 1024x768x256 screen sectioned into 12 horizontal bars, and anything that you write is put into the TOP one.  ANyhow, I think this is because I'm not changing display pages.  So I tried Three things:

>1)

>void Plot(x,y,Color)
>int x,y,Color
>{

>	int Page
>	long offset;
>	char far *address;

>	Page = y/64;
>	outport(0x3CD,Page);

>	offset = 1024*y + x;
>	address = (0xA0000000L + offset);
>	*address = Color;
>}


>2) 


>void Plot(x,y,Color)
>int x,y,Color
>{

>	int Page
>	long offset;
>	char far *address;
>	char far *PageAddress;

>	Page = y/64;
>	PageAddress = MK_FP(0000,0x462); /* The Low Memory address of the current
>						Page Number */

>	*PageAddress = Page;	

>	offset = 1024*y + x;
>	address = (0xA0000000L + offset);
>	*address = Color;
>}

>3)

>void Plot(x,y,Color)
>int x,y,Color
>{

>	int Page
>	long offset;
>	char far *address;
>	
>	Page = y/64;
>	
>	_AH = 5;
>	_AL = Page;

>	geninterrupt(0x10);

>	offset = 1024*y + x;
>	address = (0xA0000000L + offset);
>	*address = Color;
>}
>	
>The Third one at least gave me some results - everything I had drawn got moved to the bottom half of the screen and above it was about 300 horizontal blue bars that flickered a lot.  Any ideas?  This is a Trident 8900 card w/ 1 meg VRAM on a 486/33 using Borland C++ 3.0.  HELP ME DAMMIT!  Can you tell I'm frustrated? YES!!!!


>-- 
>Greg Humphreys    |  "Playing not to win is like sleeping with your 
>gregh@alw.nih.gov |  sister - sure, she's a great piece of tail, 
>                  |  and she's got a bag full of goodies, but it's 
>(301) 402-1817    |  just plain illegal."  -Charlie Sheen, "Hotshots"

Hi,
get yourself VGAKIT41.ZIP  ! it is a driver library for all SVGA cards
in 256 color modes.
So if you includes these drivers into your program, it will work on
the most standard SVGA cards..

It is available on some FTP-servers. Just ask archie. It is ASM and
C-Source-code. Also there is VESAVGA.ZIP a vesa driver library.

Best regards Stefan Hartmann.
email to: leo@zelator.in-berlin.de


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