Ghost Arcade

Ghost Arcade is an open-source projection-mapping & VJ tool. Real-time GLSL effects, WebGPU acceleration, MIDI control, mobile companion, and a Resolume-class mixer pipeline — all in one app.

It's a single product, free, and fully open source under AGPL-3.0. There are no Pro tiers, no paywalls, no watermarks.

Features

• Mapping Mode — corner pin + mesh warp on every layer, snap-to-grid, edge feather, multi-output.
• VJ Mode — 16-channel clip launcher, dual-deck crossfader, macros, snapshots, audio-reactive parameters, BPM-synced quantize.
• Effect Engine — 200+ effects across Color, Stylize, Blur, Light, Distort, Glitch, Feedback, Trails, Atmosphere, Text & Pattern, Advanced 3D, and a Geometric 3D pack with true SDF raymarching.
• Content Layers — videos, images, ISF shaders (drag-drop your own), point clouds (.ply/.splat), GLTF/FBX 3D models, lines, light painting, group layers, screen capture, Spout in/out (Windows).
• WebGPU Output — zero-copy GPU presenter via WebGPU importExternalTexture for true 4K60 with no encode/decode round-trip. Falls back to WebGL transparently.
• Mobile Companion — pair any phone over LAN via QR code; control mapping warps, layer opacity/blend, VJ clips, macros, snapshots, output freeze. Uses the same shader catalog the desktop sees.
• MIDI — full MIDI Learn, clock sync, controller mapping, dual-bank routing.
• AI Shader Generation — bring your own Claude / Gemini / Replicate / Luma keys; edit / iterate generated GLSL inline.
• Multi-Output — output windows with crop / rotate / flip per display, Spout sender for hardware projectors / NDI bridges, MP4 recording.

Getting Started

Prerequisites

• Node.js ≥ 20
• npm ≥ 10
• Windows / macOS (Linux works for browser-only mode)

Install

git clone https://github.com/riskcapital/ghost-arcade.git ghost-arcade
cd ghost-arcade
npm install

Run (Desktop — recommended)

npm run desktop

This boots Vite + Electron + the in-process LAN WebSocket server (port 9001) so the mobile companion can connect.

Run (Browser only — no Spout, no native file dialogs)

npm start

Then open http://localhost:1420.

Mobile Companion

1. Run the desktop app.
2. Click the QR-code button in the toolbar.
3. Scan with any phone on the same Wi-Fi.
4. The mobile UI loads from the desktop's built-in HTTP server (no app install needed).

Build a Distributable

npm run build:desktop          # Windows installer
npm run build:desktop:mac      # macOS .dmg

Architecture

┌──────────────────────────────────────────────────────────────────┐
│  Editor (Svelte 5 + Vite)                                         │
│  ├── Layer pipeline → effect chain → mesh warp → composite        │
│  ├── WebGL2 / WebGPU renderer (renderer/engine.ts)                │
│  └── ISF shader runtime, AnimationMixer, splat renderer           │
└──────────────────┬───────────────────────────────────────────────┘
                   │ canvas.captureStream(60) + WebGPU bridge
┌──────────────────┴───────────────────────────────────────────────┐
│  Output Window (Electron BrowserWindow)                           │
│  ├── Zero-copy WebGPU presenter (default)                         │
│  ├── WebRTC fallback                                              │
│  └── Spout sender (Windows native addon)                          │
└──────────────────────────────────────────────────────────────────┘
                   │ same-LAN WebSocket (port 9001)
┌──────────────────┴───────────────────────────────────────────────┐
│  Mobile Companion (same Svelte app, mobile route)                 │
│  └── Mapping warps, VJ clip launcher, freeze/play, macros         │
└──────────────────────────────────────────────────────────────────┘

Key directories:

• src/lib/components/ — UI panels (LayerPanel, MediaTray, EffectPickerModal, VJModePanel, MobileApp…).
• src/lib/renderer/ — WebGL2 / WebGPU engine, effect shaders, post-process passes.
• src/lib/effects/ — effect catalog, parameter metadata, presets.
• src/lib/stores/ — Svelte stores for layers, settings, vjClipLauncher, mediaLibrary, etc.
• src/lib/isf/ — ISF parser + thumbnail generator.
• electron/ — Electron main process, native dialogs, Spout bridge.
• server/ws-server.js — LAN WebSocket + HTTP server for mobile companion.
• public/ISF/ — built-in shader manifest + .fs files.

Contributing

Pull requests welcome. Please:

1. Sign your commits with git commit -s (DCO).
2. Run npm run check (svelte-check) before submitting.
3. Add a brief note to CHANGELOG.md describing user-visible changes.
4. For new effects: include a default preset in src/lib/effects/effectUX.ts, a catalog entry in effectCatalog.ts, and ParamMeta with sensible min/max/step defaults.

By contributing, you agree your contributions are licensed under AGPL-3.0.

License

Ghost Arcade is licensed under the GNU Affero General Public License v3.0 (AGPL-3.0-only). See LICENSE for the full text.

In short:

• ✔ Use it for anything — commercial gigs, installations, broadcasts, your bedroom.
• ✔ Modify the source.
• ✔ Distribute modified versions.
• ⚠ If you run a modified version as a network service, you must offer the source code to your users.
• ⚠ Derivative works must also be AGPL-3.0.

Output you create with Ghost Arcade (videos, livestreams, recordings) is yours and is not subject to AGPL.

Acknowledgements

Built on the shoulders of giants:

• Svelte 5 — reactive UI.
• Three.js — WebGL/WebGPU rendering.
• Electron — desktop runtime.
• ISF — interactive shader format.
• Šuvakov & Dmitrašinović (2013) — three-body periodic orbit catalog used in the Geometric 3D pack.

Logo design + visual identity: Risk Capital Media LLC.

Links

• Website: ghostarcade.live
• Discussions: GitHub Discussions
• Issues: GitHub Issues