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Phase 4: Add modular graph editor and transactional graph edits

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Johannes Findeisen 2026-10-26 23:55:35 +01:00
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docs/ARCHITECTURE.md
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@ -28,7 +28,7 @@ stable node IDs, topological order, precomputed input adjacency, per-node mono
buffers and oscillator/meter state. Each plan has one processing owner. Graph
edits and destruction cannot affect an existing plan. All nodes are scheduled,
including disconnected nodes; only explicit output nodes are rendered (or
terminal nodes when no output node exists). See AUDIO_ENGINE.md for contracts.
terminal nodes for legacy callers that do not require explicit outputs). See AUDIO_ENGINE.md for contracts.
`xtc_realtime` now provides a one-pending/one-retired handoff around an
exclusively audio-owned active plan. `xtc_backend` is the C backend boundary;
the optional JACK implementation drives that same realtime engine.
@ -51,4 +51,20 @@ on the GUI thread. A GUI timer reads snapshots and collects retired resources;
no audio callback calls FLTK. Successful window close first closes the JACK
client (synchronizing callbacks), then removes the GUI timer and hides the
window. Failed close leaves both handle and window available for retry. View
switching is GUI state only; editors have no domain mutations yet. See GUI.md.
switching and node positions are GUI state only. Semantic edits use transactional
C commands and publish independent compiled snapshots. See GUI.md.
## Editable graph and canvas
Phase 4 adds read-only C snapshots, monotonic node IDs, and a small set of C
edit commands. The GUI owns an opaque graph handle, never private arrays.
An edit produces a candidate, and the GUI commits it only after backend submit
succeeds (or locally while offline). A busy pending slot or invalid edit leaves
the prior model/plan unchanged. Active/submitted revisions distinguish the
queued drawing from the engine's acknowledged plan. Empty/output-less editor
graphs render silence; legacy offline terminal fallback remains available.
GraphWidget owns only selection, node positions, pointer gestures and drawing.
Its fixed canvas is hosted by FLTK scrolling. C owns nodes, ports, edges,
validation, ID assignment, compilation and rendering. No audio thread accesses
GUI-owned state. Reconnect republishes the same retained editable graph.