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Let an AppImage without NVIDIA's DLSS library download it beside the game on machines with NVIDIA's driver.

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An AppImage made with --no-dlss carries no NVIDIA file, and its builds had no DLSS. After a build its
AppRun now downloads the pinned libnvidia-ngx-dlss.so.<version> from NVIDIA's DLSS SDK repository when
/proc/driver/nvidia exists and the game folder holds no such library, checks its SHA-256 and writes the
notice that names its licence. NX2NAVI_NO_DLSS=1 skips it, and a failed download is a warning.

Pull request #290 by loteran, written again on top of the pin that came with the bundled library:
- the version, file name, checksum and address come from tools/dlss_pin.py when the AppImage is made,
  instead of a second copy in the script, and the notice is dlss_pin's own text, carried in the kit;
- it runs only when no library is beside the game, so it adds nothing to a build that placed the kit's
  and leaves a player's own version alone;
- the download goes to a name that does not start like the library's: the game takes any file with that
  prefix, and an interrupted download would have been one.

The generated AppRun passes bash -n; nothing was run on Linux here.

Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>
This commit is contained in:
chrg6
2026-11-10 06:38:45 -05:00
parent 32ee021905
commit 7d3185fca6
2 changed files with 38 additions and 3 deletions
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docs/README-BuildKit.md
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@@ -117,7 +117,9 @@ game's own scaling and swapchain as they are (the log says so).
NVIDIA DLSS (RTX cards) needs the driver's own `libnvidia-ngx.so.1` on the library path (the proprietary driver's
utilities package, `nvidia-utils` on Arch) and NVIDIA's DLSS library `libnvidia-ngx-dlss.so.<version>` beside
`ocarina`. The AppImage's kit has the library in `bin/` with `libnvidia-ngx-dlss-NOTICE.txt`, which names its licence,
and the build copies both beside `ocarina` (`tools/make_appimage.py --no-dlss` leaves it out). From a source checkout,
and the build copies both beside `ocarina` (`tools/make_appimage.py --no-dlss` leaves it out; such an AppImage
downloads the same pinned library from NVIDIA's repository after a build on a machine with NVIDIA's driver, checks its
SHA-256 and writes the notice, unless `NX2NAVI_NO_DLSS=1` is set or a library is already there). From a source checkout,
or to use another DLSS version, put the library there yourself: NVIDIA publishes it as
`lib/Linux_x86_64/rel/libnvidia-ngx-dlss.so.<version>` in [its DLSS repository](https://github.com/NVIDIA/DLSS), tagged
`v<version>`, and `tools/dlss_pin.py` names the version the kit carries. Later builds keep a library they did not