VST3 issue in FL studio

Audio Plugins
1

on mac (I didn’t test on windows)
the plugin becomes totally buggy (mouse event issue ?) after you open the FL “settings” in the plugin window.

To reproduce:

  • build the AudioPluginDemo vst3

  • instantiate it in FL studio

  • click on the keyboard to play a few notes, drag the knobs. everything is fine.

  • click on the small “gear” at the top of the window (just on the left of the plugin name), that opens a small header at the top (if that switches to a new view, just go back to the plugin view).

  • click on the keyboard -> the notes will stay down

  • try to change a knob value -> it’s buggy

3

anyone knows if its a known issue, a Juce bug, a FL bug, …?

4

I’m able to reproduce this. When you open the header menu at the top of the plug-in window we a loop of endless callbacks:

getSize() -> canResize() -> checkSizeConstraint() -> onSize() -> getSize() …

This causes the UI to freeze up and the CPU usage to spike. We’re returning the expected values here and none of the sizes are changing so I think it might be an issue in FL Studio. I’ll try to raise it with the devs.

5

thanks for taking care of that Ed.
Hopefully they will fix that soon, at the moment vst3 are unusable in FL because of that.

6

Is there any workaround we could do meanwhile to break that endless loop?

7

Setting the plug-in as non-resizable will fix the issue, I’ll see if there are any temporary workaround for resizable plug-ins.

8

OK, I’ve been in contact with one of the devs at IL and he’s got a fix that’ll be in the next beta build of FL 20.5.

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