[haiku-appserver] Re: investigating some bugs - Rudolf have a look at this please

  • From: Adi Oanca <adioanca@xxxxxxxxxxxxxx>
  • To: haiku-appserver@xxxxxxxxxxxxx
  • Date: Thu, 31 Mar 2005 13:28:26 +0300

Rudolf wrote:
> Hi,
>>>No. Why? You might confuse this with page flipping, but that is not 
>>>what is happening here. Back and front buffer do not get swapped.
>>      Then how is it that you can sync the updates with monitor refresh?
>>      AFAIK, that is only possible for a blit operation (both the source
>>and the target are in videoMem). I may be wrong, but I don't think 
>>AGP or PCIe bus is fast enough for this operation, Rudolf?
> Syncing has nothing to do with blitting. These are seperate 'functions' 
> Although GF256 and higher can do this explicitly inside the blit 
> operations as well (but I don't use that, yet (maybe later if not much 
> speed penalty))

        Looks like I will never understand this 'retrace' thing. :-))

        If one wants to _copy_ a surface from main mem to the visible frame
buffer, how can he do that if the PCI/AGP bus is so slow. How would that
image/surface would appear at once and not in pieces?

        I can understand why _blitting_ can be done during a retrace, because
video memory is very fast.

        Where am I wrong?


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