Anybody know good programming tutorial for SVGA programming thru DOS?

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  1. #1
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    Anybody know good programming tutorial for SVGA programming thru DOS?

    Anybody know good programming tutorial for SVGA programming thru DOS?

    plz help me.

  2. #2
    Super Moderator VirtualAce's Avatar
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    Yes but they will not work in a Windows session. There are 2 methods:

    • Use bank switching via interrupts or pointer to bank switch function in hardware
    • Use the linear frame buffer


    The bank switching might work under a DOS session but the pointer to the bank switch function will fail in a DOS session under Windows XP.

    The linear frame buffer will only work with a DOS extender and will most likely fail under Windows XP. I know for sure you cannot use the near-pointer LFB method under Windows XP. The only method that will work is using DJGPP and the farnspoke() family of functions. Since this means that each pixel plot equates to a function call you are probably not going to get any kind of good performance. Windows will not allow this anymore:

    Code:
    unsigned int *pLFB=NULL;
    
    //Get address to LFB
    ....
    ....//Fails when trying to map LFB to address space and access as a near pointer
    
    pLFB[offset]=color;    //Fails since pLFB is NULL



    A better option would be to explore either OpenGL or Direct3D which have made bank switching and linear frame buffer issues a thing of the past.
    Last edited by VirtualAce; 08-19-2007 at 03:58 AM.

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