Graph doesn't work

[lewark]

Currently, the graph on the left side of the UI displays nothing. I need to figure out how to use LV2 Atoms to communicate the appropriate information to the plugin UI to display a plot of the frequency response.

[lewark]

Some tasks I've been mulling over for the past months that I will need to complete to make the graph work:

• Figure out how to store float arrays of arbitrary size in an LV2 Atom (containing filter coefficients and possibly audio samples such as residue). The spec has many options for storing data, and I'm not completely sure how to use a forge to construct the atoms. The most appropriate type looks to be a Vector containing float values. Once I figure out Atoms the other processing parts seem relatively easy.
• Enable and disable feedback from plugin by sending an atom when UI is opened and closed
• Calculate the impulse response by applying the filter to an impulse (possibly update rt_lpc to the newer git version that provides a separate filter apply function). I likely want to do this processing on the UI thread so it is decoupled from the plugin functionality.
• Use an FFT (possibly through the FFTW library) to calculate a frequency spectrum from the response

I could also look into the base rt_lpc OpenGL UI code and incorporate parts of it.

Also, for that matter, what FFTs should I display? Should I also provide methods of viewing the spectrum of the output or the residue? And there's also the possibility of adding a residue mode for the plugin itself that skips the synthesis step.