Re: [Qutecsound-users] Chnget/Chnset fixed

[joachim h. <jh...@jo...>]

thanks, andrés. having both opportunities will be perfect.
can you ping when current svn supports both? then i am happy to test.
best -
	joachim



Am 22.01.2012 08:28, schrieb Andres Cabrera:
> Hi Joachim,
> 
> The problem with chnget/chnset was that I hadn't understood how it
> worked correctly when I initially tried to implement it (two or three
> years ago), but now I've got a good way of using it. I was also
> striving for full compatibility with MacCsound, which used only
> invalue/outvalue and did not support chnget/chnset.
> 
> The main difference between invalue/outvalue and chnget/chnset is
> internal. invalue/outvalue use callback functions, so every control
> pass, when there is an invalue or outvalue opcode, the callback
> function is called. In CsoundQt this currently means that each
> invalue/outvalue reads or writes to a widget (if the channel matches),
> which means locking and unlocking the widget, which can be very
> inefficient for large number of widgets. On much earlier versions of
> CsoundQt, I was storing the values in an intermediate buffer which
> were then passed to the widgets later by another thread. This was much
> more efficient but didn't work well as the value of the widget didn't
> really change until the value was processed, which could happen any
> time later, so if you read the widget value just after writing to it,
> you could sometimes get the old value.
> 
> For chnget/chnset, the values are stored internally in the Csound
> library (invalue and outvalue rely on the host application providing
> storage), so when they are called, there is no locking (actually just
> a single lock per control pass), just a reading of the current value.
> What I am doing right now is that when the user moves a widget, I
> store those changes in a queue which is processed between control
> passes. This ends up being significantly more efficient as widgets are
> only locked when they need to be written to (whenever the channel
> value changes), and not all widgets on every pass. The change has
> provided a significant improvement in CPU usage with what I am working
> on right now, and I think most users will benefit from switching to
> chnget/chnset instead of invalue/outvalue in the coming 0.7 version of
> CsoundQt.
> 
> But you are also right about the fact that CsoundQt examples all use
> invalue/outvalue and that most users will probably have followed that
> convention. I was initially thinking that it had to be just one or the
> other, but you made me realise that it might be no problem to allow
> both, so that's what I'll do.
> 
> Cheers,
> Andrés
> 
> On Sat, Jan 21, 2012 at 8:10 PM, joachim heintz <jh...@jo...> wrote:
>> one more question:
>> i think up to now, nearly all examples for csoundqt work with
>> invalue/outvalue for the widgets communication. if we change now to
>> chnget/chnset, the user has to change in configure>widgets to "use
>> chnget/chnset" instead of "use invalue/outvalue", and all the examples
>> (amongst them rené's translation of iains realtime collection) will not
>> work for him/her.
>> is it a problem to allow both, invalue/outvalue and chnget/chnset for
>> the communication between csoundqt and the widget panel?
>> cheers -
>>        joachim
>>
>>
>> Am 21.01.2012 20:49, schrieb joachim heintz:
>>> hi andrés -
>>>
>>> sounds interesting. can you describe a little bit more in detail? what
>>> has been the problem with chnget/chnset? what are the advantages in
>>> performance using chnget/chnset compared with invalue/outvalue now?
>>>
>>> thanks -
>>>
>>>       joachim
>>>
>>>
>>> Am 21.01.2012 17:28, schrieb Andres Cabrera:
>>>> Hi all,
>>>>
>>>> I've just committed a fix for the chnset/chnget opcodes. I think this
>>>> will be the recommended method to interact with widgets in the future,
>>>> so please give it a try if you are building.
>>>>
>>>> Using chnget/chnset will significantly reduce CPU usage, especially
>>>> with a larger number of widgets.
>>>>
>>>> Cheers,
>>>> Andres
>>>>
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