[LV2] Feature request: DSP write_function() ?

[Hanspeter Portner]

On 21.12.20 21:11, Hermann Meyer wrote:
> 
> Am 21.12.20 um 20:44 schrieb Hanspeter Portner:
>> On 21.12.20 19:43, Hermann Meyer wrote> Synthpod have it own issues as well,
>> so for example it create controls
>>> for patch:writable and patch:readable separately (Means it double
>>> controls and only sync the readable ones to the plugin GUi, while you
>>> could only change the writable ones, which are basically the same, but
>>> threaded different). This do as well not allow to sync the plugin GUI
>>> with host provided UI, and easily lead to a overflow in the atom ring
>>> buffer.
>>
>> Can you show your *.ttl, please?

> you know it: https://github.com/brummer10/Fluida.lv2/blob/master/Fluida/Fluida.ttl

Sorry , my bad, git checkout from github nowadays grabs the *main* branch by
default, and your experiments are on the *master* branch.

>> I think you've misinterpreted something there. An lv2:Parameter either
>> is patch:writable (read-write) OR patch:readable (read-only), but not
>> both, if I'm not totally mistaken, that is.
>>
>> If you list the same parameter both as patch:writable AND patch:readable,
>> then indeed synthpod may show two generic UI elements with only one being
>> active.
>>
> See https://github.com/lv2/lv2/blob/master/plugins/eg-params.lv2/params.ttl
> 
> plug:spring ;
> 
> It stated that parameters which may be changed internal by the plugin must be
> listed as patch:readable

Then eg-params is still wrong, because all of its parameters can internally be
changed upon a state:restore.

Makes no sense to argue here, though, we will know for sure once drobilla will
chime in.

> and, if they may be changed by the user they must be listed as well as
> patch:writable
> 
> 
> btw. that is needed for the MOD to make parameter sync work, for Qtractor it
> doesn't matter, it works with and without it, for Synthpod it leads to the
> behave described above, for Ardour it leads to a couple of error messages, Carla
> ignore it at all.
> 
> But even if I mark those ports only as patch:writable. synthpod wouldn't sync
> the port values between plugin GUI and host provided UI.

Well, synthpod in git now just ignores patch:readables, when they've already
been defined as patch:writables. Should fix all your issues.

Both sync custom->generic and generic->custom gui work as intended.

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