[REBOL] Re: Amiga View text rendering (was rebol/view on a 486?)
From: arolls:bigpond:au at: 22-Jun-2001 3:08
> But with AGA you need to do a c2p conversion. This is Not Fast at the
> best of times and even areas as small as 320x256 can bog an Amiga down
> regardless of processor: the bottleneck is the chipram bus, not the
> processor, as the planar information has to be written into a chipram
> buffer for the blitter to get at it. Go up to normal application sizes
> like 640x480/800x600 and you're looking at a LOT of work per frame and
> the bus bottleneck has a serious impact on performance.
This "chunky2planar conversion is so cpu-expensive"
argument was debunked and proven by the guy who
ported Doom to the amiga. He wrote that the c2p
conversion ended up taking less than 5% (or was
it 1%?) of cpu-time. I was getting a decent
frame-rate on an '040 aga amiga, something like
15 fps 320x256.