Re: Quite remarkable! (Lua as a waveform visualisator)
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- Subject: Re: Quite remarkable! (Lua as a waveform visualisator)
- From: "Adam D. Moss" <adam@...>
- Date: 2005年4月04日 14:18:07 +0100
Asko Kauppi wrote:
I eventually did it only the "userdata int array" way, as suggested on
the list, and the results are quite remarkable:
Lua:
fps=13.70
Native C:
fps=43.22
The application is an SDL mixer demo that plays a tune and
simultaneously shows its waveform on the screen. The 43->13 fps change
is hardly noticable to the eye, certainly much less than I expected
(the C code is tight, and the mixed sound data is passed as 2048 bytes
per callback). Well done, Lua!! :)
Without knowing how much time is spent in the non-waveform-generating
code it's impossible to say how well Lua is doing here. I mean, sure,
Lua is a pretty good performer, but this test doesn't really say much
either way (it most definitely doesn't begin to imply, for example,
that the Lua code is about 1/4 as fast as its equivilent C code). :)
--Adam
--
Adam D. Moss - adam@gimp.org