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82 lines
3.4 KiB
Markdown
82 lines
3.4 KiB
Markdown
# Terion
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Real-time stereo analyzer and mid-side vector scope audio plugin for macOS.
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Terion visualizes the stereo field of any audio signal using a mid/side coordinate system. The X axis represents the Side (difference) signal and the Y axis represents the Mid (sum) signal, plotted as an XY vectorscope with a configurable phosphor-style fading trail. It is an analysis-only plugin - audio passes through unmodified.
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## Features
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- **Mid/Side vectorscope** - XY plot with phase-mapped color (correlated content in cyan/blue, out-of-phase content shifting toward red)
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- **Phosphor trail** - configurable fade time from 0.1 to 10 seconds for persistent visual history
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- **Real-time stereo metrics** - correlation, stereo width, mid/side levels, balance, phase angle, crest factor, and peak/RMS levels
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- **Freeze** - capture and hold the current display for inspection
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- **Resizable UI** - scales from 630×420 up to 1890×1890, with preset scale factors (100/125/150/200/250/300%)
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- **Custom arc knobs** - clean rotary controls with teal arc indicators
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- **VST3 and Audio Unit** formats
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## Requirements
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- macOS
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- CMake 3.22 or later
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- C++17 compiler (Xcode command line tools)
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- JUCE framework (cloned automatically by `make juce`, or use an existing `~/JUCE` install)
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## Building
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```sh
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make all # configure + build (Release)
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make install # build, codesign, un-quarantine, install to ~/Library/Audio/Plug-Ins
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```
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### Makefile targets
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| Target | Description |
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|---|---|
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| `make all` | Configure and build |
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| `make juce` | Clone JUCE into `third_party/JUCE` (skipped if `~/JUCE` exists) |
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| `make configure` | Run CMake configure only |
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| `make build` | Compile only |
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| `make install` | Build, codesign (ad-hoc), strip quarantine, install to user plug-in dirs |
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| `make sign` | Codesign installed bundles |
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| `make unquarantine` | Strip Gatekeeper quarantine xattrs from installed bundles |
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| `make uninstall` | Remove installed VST3 and AU bundles |
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| `make clean` | Remove `build/` |
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| `make deepclean` | Remove `build/`, `third_party/`, and stray artefacts |
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### Variables
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| Variable | Default | Description |
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| `BUILD_DIR` | `build` | CMake build directory |
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| `CONFIG` | `Release` | Build configuration |
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| `JOBS` | `$(ncpu)` | Parallel compilation jobs |
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| `CODESIGN_ID` | *(empty = ad-hoc)* | Codesign identity string |
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| `JUCE_DIR` | auto-detected | Override JUCE source location |
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## Parameters
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| Parameter | Range | Description |
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|---|---|---|
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| Fade | 0.1 – 10 s | Trail persistence time |
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| Response | -12 – +24 dB | Input gain for M/S decode |
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| Size | 0.5 – 8.0 px | Size of each plotted point |
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| Smooth | 0 – 0.99 | One-pole smoothing on M/S signals |
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| Glow | 0 – 5 s | Extra lingers of the trail after the fade time |
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| Freeze | on/off | Stop capturing new points |
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## Project structure
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```
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terion/
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├── CMakeLists.txt # JUCE plugin build configuration
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├── Makefile # Build/install/sign wrapper
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├── Source/
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│ ├── PluginProcessor.* # Audio engine: M/S decode, ring buffer, metrics
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│ ├── PluginEditor.* # UI layout, knobs, freeze, scale, footer
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│ ├── VectorScope.* # XY scope rendering, trail, legends, overlay
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│ ├── ArcKnob.* # Custom rotary arc slider
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│ └── Version.h.in # Git hash/timestamp template
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└── third_party/JUCE/ # JUCE framework (auto-cloned, gitignored)
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```
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