05 - Make A Simple Amp Plugin UI With XPutty

See video: https://youtu.be/no9pBAi-F1c

We create an X11, Cairo-based graphical user interface with Xputty.

Topics

New requirements for X11

Declare as an X11 user interface: ui:X11UI
Information about the host-provided parent window
Interface for the to call the plugin UI event loops: idle interface
- lv2:requiredFeature ui:idleInterface
- lv2:extensionData ui:idleInterface
Destructor to cleanup / deallocate plugin UI widgets

Construct the UI

Init Xputty:main_init ()
Create a top level widget: create_window ()
Create a dial widget inside the top level widget: add_knob ()
Link the dial to valueChangedCallback
Add values and a value range: set_adjustment ()
Visualize: widget_show_all ()

Set / Get dial

Set dial value via portEvent: adj_set_value ()
Get dial value in valueChangedCallback: adj_get_value ()

Idle interface

Provide a static idle interface function
Call run_embedded ()
Link idle interface function in extension data