Re: More LV2 questions

Am 12.08.26 um 17:49 schrieb Robin Gareus:
> On 2026-08-12 5:30 PM, Hermann Meyer wrote:
>>
>> Am 11.08.26 um 14:10 schrieb Fons Adriaensen:
>>> Hello all,
>>>
>>> Some more questions on my way to grok LV2
>>>
>>> 1. Should hosts echo parameter changes to the GUI if
>>>     the change came from the GUI ?
>>>
>>>     Jalv doesn't, Ardour does. That can make continuous
>>>     changes (e.g. a fader) look erratic as the echo will
>>>     probably arrive when the widget has already moved
>>>     to the a new value.
>>
>> You should at least be prepared for such a behave and break the loop 
>> on your side.
>>
>> Remember, the host is the house keeper and the plug is the guest.
>
> The reason for this is that the parameter may be automated. Active 
> automation overrides user manual control, unless the automation mode 
> is "Touch" and the plugin sends a touch event for the given control
>
>
>>> 3. A GUI may want to show an optional second window
>
> Don't do that. This is frowned upon and causes problems on systems 
> without z-axis positioning API for windows.
>
> The only system with a z-axis window stacking API specifically 
> mentions that plugins SHOULD NOT open additional windows in their 
> human interface guidelines.
>
libxputty take care of that, and, keep any separate window as child of 
the main window, regardless if it is created on root or on parent 
window. I never see a issue with that, nor do I ever get a report about.


> -- 
> robin