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Re: Mplayer Altivec test version for G4 and PA6T-1682M

Subject: Re: Mplayer Altivec test version for G4 and PA6T-1682M
by Hans on 2014/4/5 10:19:16

@LiveForIt

Quote:
There are some differences between cgx_wpa and comp output.
First difference I use ARGB bitmap, not RGB bitmap, this does not effect the X1000 at all, at lest not on my computer. But it might effect computers whit slower RAM bus.

13% more data is need to be sent to the graphic card, your result show that the bus speed is the bottleneck.


I realise that this is from an old post, but using a 24-bit RGB bitmap won't save on bandwidth because the destination bitmap is 32-bit ARGB.** Writing 3 bytes and then skipping one across the PCI(e) bus would be hideously slow, so it has to be converted to ARGB first, and then copied.

Hans


** Graphics cards don't like 24-bit bitmaps, because the pixels aren't nicely aligned to 32-bit boundaries.
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