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feat: add a headless mode, driven by clap CLI args

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Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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surv
2026-09-20 13:37:33 +02:00
co-authored by Claude Sonnet 5
parent cc0609ffbb
commit 45654c0846
8 changed files with 319 additions and 114 deletions
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CLAUDE.md
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@@ -31,10 +31,15 @@ cargo install wasm-bindgen-cli --version 0.2.128 # must match the wasm-bindgen
python3 -m http.server -d dist 8080
```
Native debug env vars (see `src/app.rs`, near the top of `FractalApp::new`):
`MANDEL_KIND`, `MANDEL_POWER`, `MANDEL_JULIA="re,im"`, `MANDEL_SHARE="<fragment>"`,
`MANDEL_VIEW="re,im,half_height[,iterations]"`, `MANDEL_DE=1`,
`MANDEL_BUDDHABROT=1`, `MANDEL_EXPORT=1` (+ `MANDEL_EXPORT_PATH=out.png`).
Native CLI flags (`src/cli.rs`, applied in `FractalApp::apply_cli`): `--kind`,
`--power`, `--julia re,im`, `--share <fragment>`,
`--view re,im,half_height[,iterations]`, `--de`, `--buddhabrot`,
`--buddha-palette`, `--export` (+ `--export-path out.png`). `--headless`
(`src/headless.rs`) skips the window entirely: it builds the same view from
the other flags, creates its own offscreen wgpu device, and renders straight
to a PNG (`--width`/`--height`, default 1920×1080) — implies `--export`'s
save behavior without needing a GPU-backed window/event loop. Not yet
supported with `--buddhabrot`. Run `mandelbrot --help` for the full list.
There's no GPU in most sandboxes: `cargo check`/`cargo test --test shader_valid`
are the fast, headless way to validate a change. `cargo test` also runs but