[LV2] Feature request: DSP write_function() ?

[Hermann Meyer]

Am 22.12.20 um 16:21 schrieb 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.
>
>
>
Nice, thanks a lot!

regards

hermann