VBE 3.0 PM-Interface initialization

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Honk

Joined: 29 Aug 2007
Posts: 5

Honk 11 Sep 2007, 17:02

hi Folks,

I'm looking for a short Vesa Protected Mode Initialization routine for FASM (with all that LDT , Selectors Stuff). I hope, that someone already solved that task 'cause I have some basic ideas about that but don't want to get deeper in that development - I aim at coding beautiful Gfx-Intro stuff ..

Thanks and so long

honk

www.battlebytes.de

11 Sep 2007, 17:02

Dex4u

Joined: 08 Feb 2005
Posts: 1601
Location: web

Dex4u 11 Sep 2007, 20:27

Why not code it for DexOS ?, its as simple as

Code:

 ;----------------------------------------------------; ; Do realmode int (vesa).                            ; ;----------------------------------------------------;      mov   cx,0x4112   ;vesa mode  call  [SetVesaMode]   cmp   ah,1    je    VesaError1 ;----------------------------------------------------; ; Load vesa info.                                    ; ;----------------------------------------------------;   call [LoadVesaInfo]   mov   edi,VESA_Info   mov   ecx,193 cld   cli   rep   movsd   sti

To set any vesa mode, your card supports, from pmode.

11 Sep 2007, 20:27

Honk

Joined: 29 Aug 2007
Posts: 5

Honk 13 Sep 2007, 12:29

Hi,

DexOS is a really nice project. But intro coding for the Gfx szene is better done on "well known" systems like DOS or Windows.

It seems, that nobody has written a VBE PM Mode init so I'll do it on my own and post it here Cool

So long

Honk

13 Sep 2007, 12:29

sinsi

Joined: 10 Aug 2007
Posts: 794
Location: Adelaide

sinsi 13 Sep 2007, 12:47

Do all of your init stuff (checking modes, setting a linear mode) from RM and all you need is a descriptor for the vesa buffer - if you're going into PM anyway an extra descriptor is easy enough.

13 Sep 2007, 12:47

Dex4u

Joined: 08 Feb 2005
Posts: 1601
Location: web

Dex4u 13 Sep 2007, 18:08

I have done a demo that may help, it will run from Dos, just change one of the return to realmode by adding a exit to dos.
http://www.dex4u.com/demos/DemoVesa.zip
Note: i was called ASHLEY4 when i wrote it.

I hope you release the code so i can port it to DexOS, as a side note: you can run DexOS from ms-dos.

13 Sep 2007, 18:08

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