# Windows bundle resources

Files in this directory ship side-by-side with `lumotia.exe` to avoid the
DLL-hell failure modes reported in Whispering #840 / #829 and Buzz
#1459. They are **not** committed to the repo.

## Release-engineer workflow

Before a Windows release build, populate this directory from a trusted
source (see table below), then pass `--resource` flags through to
`tauri build`:

```powershell
cargo tauri build --target x86_64-pc-windows-msvc -- `
  --resource src-tauri/resources/windows/vulkan-1.dll `
  --resource src-tauri/resources/windows/libssl-3-x64.dll `
  --resource src-tauri/resources/windows/libcrypto-3-x64.dll
```

These files are **not** declared in `tauri.conf.json` /
`tauri.windows.conf.json` because `cargo check` (which runs in every
CI job) evaluates `tauri-build` and fails if a listed resource path
doesn't exist. Keeping the bundle flags at `tauri build` call time
means `cargo check` stays green on vanilla checkouts while release
builds still pick them up when the release engineer runs the
populated command above.

| File | Source | Why |
|---|---|---|
| `vulkan-1.dll` | [LunarG Vulkan SDK](https://vulkan.lunarg.com/sdk/home) runtime installer, or copied from `C:\Windows\System32\vulkan-1.dll` on a machine with Vulkan-capable GPU drivers | whisper.cpp's Vulkan backend refuses to initialise without it |
| `libssl-3-x64.dll`, `libcrypto-3-x64.dll` | OpenSSL 3.x Windows build (e.g. shining-light installer) or copied from the user's `%SystemRoot%\system32` | reqwest → rustls transitively pulls these when TLS-backed downloads fail in CI; shipping them removes the "app fails to download model" class of bug |

The runtime falls back gracefully if any of these are missing at launch:
see `src-tauri/src/commands/models.rs::detect_active_compute_device`
and `emit_runtime_warnings` — the app will emit a `runtime-warning`
event with kind `vulkan-loader-missing`, downgrade the reported
`activeComputeDevice` to CPU, and keep running. The bundle is a
performance + reliability patch, not a load-bearing dependency.

## Why isn't this a script?

Licensing. We deliberately don't auto-fetch these DLLs from a CI job —
the LunarG SDK ships under the Apache 2.0 license but redistribution is
conditional on an acknowledgment, and the OpenSSL 3 bundling terms want
a source-availability note in the installer. Manual placement keeps the
redistribution legally clean per-release.

Brief reference: docs/whisper-ecosystem/brief.md item #12.
