Re: iBook and playing DVDs
>
>Maybe we could even have the chip display the overlay out of AGP memory
>directly?
ATI doesn't recommend that. The refresh rate of the screen is high enough
that if you display from AGP memory, you'll cause a hell lot more
throughput on the bus than with a single blit.
>
>> >> >Anyway, I don't see any explicit synchronisation in the driver, so
>> >> >probably the problem is the players calling XSync().
>> >>
>> >> Well, do we wait for DMA to finish or not ? If we do, then we are
>> >> doing explicit sync.
>> >
>> >Again, I don't see that in the driver, but maybe I'm just blind.
>>
>> Could be implicit as part as a wait for engine ready or a 2D sync,
>
>That's exactly what I looked for but didn't see. :)
>
>> though I yet have to look at the impl. We should try to figure out
>> where X is actually spending those cycles.
>
>Yep, someone who cares about this will have to do that.
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