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[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. > Chris
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. Anton.