Hi - first post but I am NOT a student looking to rubberstamp GSoC all over my 
resume :)

RJ, you may remember me from www.hackerdjs.com/software/cdj2midi.html, 
introduced by Mark Hills, through Adam D, I think. Since we last spoke I've 
become a linux-head, been stalking Mixxx-devel for a month.

Seeing you're into 3D/games I'm surprised Mixxx uses Javascript, Python and 
qtScript but not Lua.

I'm guessing the initial choice of XML/Javascript was to attract more people to 
write controller glue code but Mixxx has gotten a lot of traction/attention 
since then. With a new focus on reliability, Mixxx/hardware-interface drivers 
should really be written by somewhat experienced programmers (at least not 
invite bad code). QA's a bitch now cause you often don't have the hardware but 
if Mixxx's user base keeps growing as it does you'll soon be able to threaten 
manufacturers *not* to support their device:)

Assuming Mixxx maintains its growth (vs withers & dies), driver and hardware 
availability is a given, what matters is runtime quality/efficiency. Porting 
the current ./res/controllers/ is a one-time effort. Also, the majority of 
users will be non-techie DJs; at the top DJs with a coding assistant :)

Wrt speed, Javascript engines can afford many luxuries when running in web 
browsers (or servers) because they're not dealing with 10ms latencies. A 
web-surfing user won't notice a garbage collector hiccup but in a "critical 
realtime" app like Mixxx it's the end of the world for a very pissed DJ. 
Hardcore videogames are somewhat similar and there's virtually no Javascript; 
#1 engine is Lua because it's tiny and predictable; where the VM falls short 
you bind native C code in a handful of lines.

Either way I think it'd make sense to use the same VM for both drivers and 
macros since they're really on the same path between the hardware interface and 
Mixxx.

(bowing out)

-- p

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