Add BelaScope UGen

[giuliomoro]

@sensestage, if I got it right you suggested to add a method logChannel(float value, int channel), and a method frameCompleted() to the Bela Scope class. Each scopeChannel uGen would call Scope::logChannel() while a sort of "wrapping" ugen would then call frameCompleted().

I thought over this and I think that we could do this, instead:

• we do not change the interface of Scope
• the scopeChannel ugens "log" to the "wrapping" ugen, which stores in a buffer all the logged data for the current block.
• when all the ugens have logged, the "wrapping" ugen logs to Bela's Scope one frame at a time using the existing method log(float* buffer).

Does it sound reasonable?

[elgiano]

Hello! I just started using Bela, and really miss this feature when writing SC code. I would be happy to go for an implementation, here is how I would plan it, based on the discussion above. Please let me know what you think, it would be great to have some feedback before I start working on it

Requirements:

• Scope must be created on the server
• must be possible to scope to different channels from different synths
• use existing log() interface

Implementation:

BelaScopeUGen:

• init Scope object
• read maxChannels from belaScopeBus (\audio)
• copy to buffer

BelaScope (sclang): init(server, maxChannels):

• reserve belaScopeBus = Bus.audio(server, maxChannels)
• add {BelaScopeUGen.ar(belaScopeBus, maxChannels)}.play to ServerTree, to tail (and possibly refuse to create more than one BelaScopeUGen)

scope(channel, data): helper class method to be used in SynthDefs, returns Out.ar(belaScopeBus+channel, data)

• data = data.asArray
• if(channel + data.size > maxChannels): error
• data.collect: switch(d.rate){ \scalar }{ DC.ar(d) }{ \control }{ K2A.ar(d) }{ d }

[giuliomoro]

Closed with a slightly different approach in 2fc8ce657613a24b5cecc5abe1776b5377af4bc6 a04483c9de5848657f361e858bf6261b02a0813d#75