[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 13:18:58 +0300

Rudolf wrote:
>>      OK, let's see if I have this right.
>>      FrontBuffer = frame buffer. BackBuffer = a buffer the same size as 
>>frame buffer.
>>      If that's the case, where do you put the back buffer when 
>>runs on haiku with accelerated drivers?
>>>front buffer updates are synced with the monitor refresh.
>>      Doesn't that require the back buffer being inside videoMem?
>>      Rudolf?
> Syncing itself does not: it's just waiting for that semaphore. Copying 
> the data only 'requires' the backbuffer to be on the gfxRAM if you want 
> to use the graphics GPU to blit it to the frontbuffer. Even then, it's 
> not supported to do that currently. You will be doing software copying 
> anyhow.
> The only way you can do a GPU blit would be to tell the gfx driver to 
> create a virtualscreen, and use the offscreen part of that for the 
> backbuffer. Other options do not exist with the current driver 
> architecture.

        Yup, just like Allegro game engine does.

        We should do that too for CopyRegions inside the HW accelerated
version of DisplayDriver.

        Stephan, Michael?


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