Native visual-novel engine and source-backed Editor. Rust 2024 (MSRV 1.99.0), Bevy 0.19.1, GPUI.
Native authoring uses Eiyashou .shou; LetsGal Studio and frozen WebGAL compatibility inputs are supported.
Shipping projects use Hakutaku v2, WebP images and Ogg Opus audio.
editor-latest: standalone Editor with a matching Preview Engine; updated after successful main-branch Desktop CI.tday-latest: tday demo; built only by manually running Build tday.
See publishing for package layouts, signatures and project releases.
cargo build --locked -p keine --bin keine --features video-native,video-ffmpeg
cargo editor projects/tday
cargo validate tests/fixtures/native-smoke
cargo dev tests/fixtures/native-smokeUse the pinned toolchain and install the native SDKs listed in the development guide. The development alias above enables FFmpeg; macOS prefers its native video backend. Build the Engine before starting Editor Preview: Editor launches an existing executable and does not run Cargo. Migration and formal bundling are separate publisher operations.
projects/tday/ is a sealed, playable demo with tracked WebP/Opus media. Use a copy for experiments; its PNG/WAV originals and other local projects are ignored. tests/fixtures/ contains the regression projects.
The Editor controls a separate native Engine window. Text, Blocks and Inspector edit one source document.
Compatibility JSON is read-only; migration is explicit and preserves its input.
Measured on Apple M5 Pro (15 logical CPUs), 24 GiB RAM, macOS 27.0.1, 2026-10-16, using the 0.16.3 working tree with parser allocation improvements included in 0.16.4. With the same optimized Criterion benchmark, 100,000 text statements improved from 85.26 to 75.09 ms; the 2,626-action tday corpus improved from 2.27 to 2.13 ms.
Same-machine CPU microbenchmarks below use equivalent content in each language, single-threaded, warm in-memory input. Each result is the median of three process medians, each with five warm-ups and ten samples; output destruction is excluded.
| Native script path | Parse 10k text statements | Parse 10k assignments | Execute 10k increments |
|---|---|---|---|
| Kēne / EYS, optimized 0.16.3 | 5.98 ms | 4.40 ms | 0.65 ms |
TyranoScript c8dbfd4, V8 / Node 24.22 |
2.50 ms | 7.01 ms | 0.77 ms |
| Suika3 26.07.13, C tag path | 1.06 ms | 1.77 ms | 16.49 ms |
| Ren'Py 8.5.3, SDK Python 3.12 | 81.65 ms | 63.23 ms | 3.74 ms |
The parsers produce different structures and perform different semantic checks. Execution uses prepared scripts and native command handlers/Core; host persistence, frame scheduling, rollback, UI, media and rendering are excluded. Suika3's NoctLang/JIT is unmeasured. These are specific-path measurements, not a whole-engine ranking or startup comparison: shipping Kēne and Ren'Py can load compiled scripts. The desktop was not isolated. Exact contracts, versions, raw results and reproduction commands: testing guide.
crates/ core, loader, authoring protocol, Editor, media
src/ engine; all embedded resources in src/assets/
tests/ integration, fixtures, bench, fuzz, video acceptance
dev/docs/ current documentation
dev/scripts/ build and release scripts
- Architecture and data contracts
- Eiyashou v2.0
- Editor
- Development, testing and acceptance
- Publishing
- Android build and device acceptance
- Compatibility limits
Current version: 0.16.7. macOS is the current acceptance focus; Windows/Linux runtime acceptance is deferred. Build/test success and manual input/display/media acceptance are separate gates.
Original Kēne code and documentation use the Defold License 1.0. Commercial games are allowed; commercialisation of the engine or Editor as a Game Engine Product is restricted. This is source-available software. Third-party dependencies and assets retain their own licenses; see NOTICE. The tday demo's scripts and media are original works by shiftz and retain their separate copyright; see tday's notice. Contributions are accepted under the same license unless separately agreed.