Re: Page flipping on LFB in protected mode...how??!?!

Tim Roberts schrieb:
> spamtrap@xxxxxxxxxx wrote:
>
>>I am messing around with VESA graphic modes. I started
>>writting my own OS from scratch as a personal project and I took
>>a tangent into graphics. I already implanted Bresenham's line drawing
>>algorithm but I can't for the life of me find enough information about
>>page flipping.
>>
>>I am running my kernel in protected mode. Is anyone on here aware of
>>how I can do page flipping or where I can find the information I need
>>to accomplish this. I would be great if I didn't have to come out of
>>protected mode. Coming back to real mode to flip pages through the BIOS
>>to finally go back to protected mode to then again redo the same thing
>>again ad infinitum is not favorably 'drawing' my attention.
>>
>>I am using VESA mode 118h in linear mode (1024x768x24)
>
> Unfortunately, the frame buffer base address is one of the registers that
> is not standardized from manufacturer to manufacturer. If you really want
> to avoid the video BIOS for this, you will have to do a little bit of
> research to figure out where the register lives for the video cards you are
> interested in.

Maybe the base address vary by each videomode.
So i look to the modeinfo(+28h) to get the linear address.

I prefer 32Bit modi, get a pointer to modelist of the vbe-info(+0Eh).

Dirk

.

Relevant Pages

  • Re: Page flipping on LFB in protected mode...how??!?!
    ... >I am messing around with VESA graphic modes. ... >I am running my kernel in protected mode. ... is not standardized from manufacturer to manufacturer. ... to avoid the video BIOS for this, you will have to do a little bit of ...
    (comp.lang.asm.x86)
  • Re: Page flipping on LFB in protected mode...how??!?!
    ... Dirk Wolfgang Glomp wrote: ... >>>I am messing around with VESA graphic modes. ... >>>I am running my kernel in protected mode. ... >>>how I can do page flipping or where I can find the information I need ...
    (comp.lang.asm.x86)
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  • Page flipping on LFB in protected mode...how??!?!
    ... I am messing around with VESA graphic modes. ... I am running my kernel in protected mode. ... how I can do page flipping or where I can find the information I need ... again ad infinitum is not favorably 'drawing' my attention. ...
    (comp.lang.asm.x86)
  • Page flipping for FORTH based graphics
    ... I am messing around with VESA graphic modes in FORTH. ... I am running my kernel in protected mode. ... how I can do page flipping or where I can find the information I need ... again ad infinitum is not favorably 'drawing' my attention. ...
    (comp.lang.forth)