Re: Quite remarkable! (Lua as a waveform visualisator)

["Adam D. Moss" <adam@...>]

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