Thread: SVGA mode in Borland C

  1. #1
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    SVGA mode in Borland C

    I'm using Turbo C (3.0 to be exact) and I was wondering how do I call the video to a SVGA mode. Any help? Thanks ;-)

  2. #2
    Registered User VirtualAce's Avatar
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    First consult the RBIL and look up the VESA VBE functions on int 10h.

    To set the video mode:

    asm
    {
    mov ax,4F02
    mov bx,mode
    les di,CRTCbufferblock
    int 10h
    }

    note that you do not have to load ESI with anything if bit 11 in the mode is not set.

    To enable the LFB, set bit 13 in the mode - only valid for protected mode and for video modes that support the LFB.

    Again, get RBIL and look up the functions.

    http://www-2.cs.cmu.edu/~ralf/files.html

  3. #3
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    the mode

    What's the exact mode of it? For example, mode 12h is 640x480 VGA (16 colors), 13h is 340x200 VGA (256 colors), mode blah blah blah.

  4. #4
    Linguistic Engineer... doubleanti's Avatar
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    There was a bit of board processing up there. He meant ES: DI, the memory address register [if i'm not mistaken] of the 8086. Oh and the modes vary from card to card, as do their capabilities, so it's not as straight forward [or compatible] as 13h would be. Not to mention using VESA is [unfortunately] looked upon as outdated by much of the newer community. Here are the general steps for getting you started. [read up on RBIL and the VBE 3.x specs to implement it...]

    1.) get the controller information and modes list
    2.) get the pointer to the video display [and any backbuffers if you use them]
    3.) enjoy...
    hasafraggin shizigishin oppashigger...

  5. #5
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    thanks

    Thanks for the input ;-)

    By using te video interrupt 10h and the C interrupt function, I was able to set it in SVGA:

    void set_mode_svga(void)
    {

    union REGS inregs,outregs;

    inregs.h.ah = 0;
    inregs.h.al = 0x005f; // video mode to change to

    int86(0x10, &inregs, &outregs);

    }
    Only problem is, it's showing double images at the top of the screen. I think I can figure that out, though. Thanks ;-)
    Last edited by WHurricane16; 04-09-2002 at 06:27 PM.

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