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horizont/AGENTS.md
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AGENTS.md

Guidance for working in this repository.

Project

Horizont is a stereo algorithmic reverb audio plugin (VST3 / AU) for macOS. It pairs a Schroeder/Moorer reverb core (diffusion allpass + parallel damped combs, gains derived from RT60) with a granular feedback pitch-shifter loop. Built with JUCE and C++17. See README.md for the full DSP description.

Build & test

From the repo root:

make            # fetches JUCE 8.0.15 into ./JUCE if missing, configures + builds (Release)
make install    # installs into ~/Library/Audio/Plug-Ins/VST3 and .../Components
make clean      # delete the build directory
  • Build artefacts land in build/Horizont_artefacts/Release/.
  • JUCE must be a 8.0.x release tag — JUCE 9/master refactored the LookAndFeel API and is not supported.
  • Configure manually with cmake -B build -DCMAKE_BUILD_TYPE=Release -DJUCE_ROOT="$(pwd)/JUCE".
  • There are no unit tests in this project. Verify by building, then loading the plugin in a host (or auval for the AU).
  • C++17 only; avoid pre-C++17 and post-C++17 features.

Layout

CMakeLists.txt          build config; new source files must be added here
Makefile                one-command macOS build/install
Source/
  PluginProcessor.*     processor, APVTS, state save/load, host program (presets)
  PluginEditor.*        layout, panels, preset combo box
  HorizontEngine.*      reverb DSP core (allpass diffusers + comb bank + feedback loop)
  PitchShifter.*        granular crossfade pitch shifter
  HorizontLookAndFeel.* dark teal theme, skeuomorphic rotary knobs
  Knob.*                knob component (slider + caption + value readout)
  SpectrumDisplay.*     animated wet/dry spectrum analyser (FFT, timer-driven paint)
  Presets.h             factory presets

Conventions

  • Follow JUCE style: lowerCamelCase methods/variables, UpperCamelCase classes, leading-underscore members in some files (match the file you edit).
  • Match existing brace/paren style exactly (juce:: type usage, trailing space, tabs for indentation).
  • No dynamic allocation in audio callbacks — the processor uses pre-sized buffers and juce::SmoothedValue for per-sample parameter smoothing.
  • All DSP is sample-rate independent: delay lengths, filters, and grain windows scale with the sample rate.
  • Only add source files after updating target_sources(...) in CMakeLists.txt.
  • Do not add comments unless they explain a non-obvious DSP decision; the existing code is mostly self-documenting.
  • The UI is a dark teal hardware-rack style; new UI code should match the existing palette in HorizontLookAndFeel.h / SpectrumDisplay.cpp rather than introducing new themes.