Blog post: Development update (April 6)

website/blog/2019/04-06-development-update.md

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+Title: Development update (April 6)
+Date: 2019-04-06
+
+This [commit](https://github.com/odahoda/noisicaa/commit/c3e5c3a88dcf7cfac5f13cd67601be0b8c2fe3a5)
+adds the capability to have nodes with dynamic ports, i.e. the list and types of ports are not
+static anymore, but can change during the lifetime of the node. For now this is only used by one
+builtin node type, but I plan to make more use of that feature in the future. E.g. to have a single
+"VCA" node with a flexible number of channels, instead of needing a number of separate "VCA (mono)",
+"VCA (stereo)" nodes.
+
+### What's new
+
+The Custom CSound node now has a dynamic port list. Ports can be added, removed and modified.
+
+### Internal changes
+
+* The NodeDescription of a node can be generated dynamically. Changes are propagated to the audio
+  engine and for some changes, e.g. port type or direction changes, the underlying processor
+  instance gets reinitialized (which does cause a brief audio glitch, if the processor is hooked up
+  and producing sound).
+
+* Added node parameters, which are persistent in the audio engine graph, but not part of the
+  project. Used for setting the CSound orchestra and score of the Custom CSound node. Processors
+  already had the concept of parameters, which has been assimilated into the more generic node
+  parameters.
+
+* A new ObjectListEditor class, which provides a table widget for editing lists of
+  objects. Currently only used for the port list editor of the Custom CSound node.