Files
gig-line/Docs/build.md
T
zwitschi 4832e66c00 fix(input): restore working controls + add input harness + build fixes
Consolidated from the qa-input-collision-fix-0.1.0 work, applied onto main so
only the changes main genuinely lacks are carried (main already merged the
walkable-demo/collision work independently).

- fix(input): populate the UE 5.8 FInputMappingContextMappingData
  DefaultKeyMappings field in ue_create_input_assets.py (the runtime reads
  GetMappings()->DefaultKeyMappings.Mappings; the script previously wrote only
  the deprecated 'mappings' array, so the cooked game had 0 runtime mappings
  and every key silently did nothing — in packaged AND PIE). Regenerated
  IMC_Default.uasset. WASD/mouse/Space/R/Escape verified working.
- fix(build): drop editor-only APIs that break the game target build —
  UStaticMesh::PostEditChange() (GigLineAssetTools) and AActor::GetActorLabel()
  (character ground probe). GigLine and GigLineEditor now both compile clean.
- tools: OS-level uinput input harness (input_emulation.py + input_test.py) and
  run_pie.sh for PIE isolation; document the PIE-vs-packaged input test in
  Docs/build.md. Removed the temporary SIM/EI/screenshot diagnostics from the
  character.
2026-11-08 13:43:33 +01:00

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Markdown

# Build
Fresh-checkout build procedure. Completed 2026-11-07 after the pinned engine was installed and a blank `Game/GigLine` build was packaged and launch-tested.
## Constraints
- Engine installation is external to the repository. Record its path and exact version in [toolchain.md](toolchain.md).
- Build output (`Binaries/`, `Intermediate/`, `Saved/`, `DerivedDataCache/`) is never committed.
- Large content is LFS-tracked, so a fresh clone needs `git lfs install && git lfs pull` before any build.
## Engine
Pinned install: **Unreal Engine 5.8.4** (CL 58902052, promoted build) at
`/run/media/system/DATA/Engines/UE_5.8.4`. The engine bundles **no** Linux clang; the system clang (23.1.4, Fedora 45) is the game-code toolchain. Game targets must use `BuildSettingsVersion.V7` to share the installed editor's build environment.
## Fresh-checkout build
```bash
git clone <remote> gig-line && cd gig-line
git lfs install && git lfs pull
Tools/check-lfs.sh # must pass before any content build
# Compile the project's editor target (first build also proves the toolchain)
cd /run/media/system/DATA/Engines/UE_5.8.4
Engine/Build/BatchFiles/Linux/Build.sh GigLineEditor Linux Development \
-project="$PWD/../../Documents/06-games/gig-line/Game/GigLine/GigLine.uproject" \
-WaitMutex
# Expected tail: "Result: Succeeded"; module binary lands in
# Game/GigLine/Binaries/Linux/libUnrealEditor-GigLine.so
# Open in the editor (GUI, Vulkan)
./Engine/Binaries/Linux/UnrealEditor \
/run/media/system/DATA/Documents/06-games/gig-line/Game/GigLine/GigLine.uproject
```
Adapt the `-project=` path to the actual checkout location.
## Package a Linux build
```bash
cd /run/media/system/DATA/Engines/UE_5.8.4
Engine/Build/BatchFiles/RunUAT.sh BuildCookRun \
-project="/run/media/system/DATA/Documents/06-games/gig-line/Game/GigLine/GigLine.uproject" \
-noP4 -platform=Linux -clientconfig=Development \
-cook -allmaps -build -stage -pak \
-archive -archivedirectory="/run/media/system/DATA/Builds/GigLine" \
-unattended
# Expected: "BUILD SUCCESSFUL" (~1 min for the blank project; archive ~1.1 GiB)
# Launch test (plain, no -map): /run/media/system/DATA/Builds/GigLine/Linux/GigLine.sh
```
**Launch test must open the DemoMap.** A plain `./GigLine.sh` should load
`/Game/Hollywood/DemoMap` (set via `DefaultEngine.ini` `GameMapsSettings`). If it
instead opens `/Engine/Maps/Templates/OpenWorld`, the game shows an empty
non-interactive "stuck" scene — check that `GameDefaultMap` is in
`DefaultEngine.ini`, not `DefaultGame.ini`. Confirm the loaded map in the engine
log: `.../Linux/GigLine/Saved/Logs/GigLine.log` (`LoadMap: /Game/Hollywood/DemoMap`).
The archive directory is deliberately **outside** the repository; never archive into the checkout.
## Headless content checks
Both content-acceptance tests run headless and are the template for all asset import verification:
```bash
# Static-mesh scale test (Blender export -> Unreal import -> measure)
# Blender: Tools/scale_test_export.py, Unreal: Tools/ue_scale_test_import.py
# MPFB character (generate -> rig -> bake -> export -> skeletal import)
# Blender: Tools/mpfb_character_export.py, Unreal: Tools/ue_character_import.py
# Unreal side of any test:
./Engine/Binaries/Linux/UnrealEditor-Cmd \
/run/media/system/DATA/Documents/06-games/gig-line/Game/GigLine/GigLine.uproject \
-run=pythonscript -script=<repo>/Tools/<script>.py -nullrhi -unattended -nopause -stdout
# Note: 5.8 swallows Python print() in the commandlet; scripts write result files to /tmp.
```
## Content pipeline (current)
The hero block and the demo level are built by a fixed sequence. Each step writes
a result file under `/tmp/gigline/`; read it, because the commandlet's own stdout
can be swallowed.
| Step | Tool | Output |
| --- | --- | --- |
| OSM blockout | `Art/blender/blockout/blosm_blockout.py` | `Art/blender/blockout/blockout-*.blend` |
| Terrain | `Art/blender/terrain/terrain_from_dem.py` | `Art/blender/terrain/terrain-*.blend` |
| Street | `Art/blender/street/street_mesh.py` | `Art/blender/street/street-*.blend` |
| Site assembly | `Art/blender/site/site_assembly.py` | `Art/blender/site/site-*.blend` |
| Site export | `Art/blender/site/export_site_fbx.py` | six FBXs, one per mesh |
| Hero façade | `Tools/hero_facade_build.py` | `Art/blender/hero/hero-facade-*.blend` + JSON report |
| Site import | `Tools/ue_import_site.py` | `/Game/Hollywood/Site/*` |
| Hero import | `Tools/ue_hero_facade_import.py` | `/Game/Hollywood/ElCapitan/SM_HeroFacade` |
| Demo map | `Tools/ue_build_demo_map.py` | `/Game/Hollywood/DemoMap` |
| Review shots | `Tools/ue_build_review_map.py` + `Tools/render_screenshots.sh` | `Screenshots/` |
Two rules that the pipeline enforces rather than documents:
- **One conversion.** Metres to Unreal centimetres happens only in
`Geo/tools/osm_common.py::to_unreal_local`. Sidecars (`<asset>.geo.json`) record
the result and `Geo/tools/asset_metadata.py audit` re-derives it.
- **Collision is decided at import,** not later: terrain, road and sidewalks are
complex-as-simple; kerbs and props stay simple. A simple hull over a kerbed
street ramps straight across the kerb.
## Known engine quirks (2026-11-07)
- One handled `PSOPrecache` ensure fires at packaged-build exit only; not blocking.
- Interchange 5.8 does not create material/texture assets for skeletal FBX imports — `Tools/ue_character_import.py` finishes that chain explicitly.
- Android Turnkey status errors and datarouter DNS warnings in logs are benign.
## Packaged Linux build
- 2026-11-07: blank `Game/GigLine` Development build packaged via the command above; 1.1 GiB archive at `/run/media/system/DATA/Builds/GigLine/Linux`; `GigLine.sh` launched on the desktop session, Vulkan swapchain created, 759 frames rendered across a 60 s smoke test. Controls document to be written with the first playable (`0.1.0` Gameplay section).
## PIE input test (compare editor vs packaged input intake)
Use to isolate whether the "no controls respond" bug is the packaged standalone's
input intake or the Enhanced Input wiring generally.
- `Tools/run_pie.sh` opens the editor on `/Game/Hollywood/DemoMap`. Press the
green **Play** (PIE) button and walk / mouse-look.
- Interpretation:
- PIE **works** -> the Enhanced Input wiring is fine and the standalone
packaged build's SDL input intake is the environment-dependent bug.
- PIE **fails** too -> the Enhanced Input setup itself is broken; rebuild
the input config / character from scratch.
- The DemoMap is PIE-ready as committed: `GlobalDefaultGameMode` +
`GameDefaultMap=/Game/Hollywood/DemoMap`, and the map stages a PlayerStart at
`(-13336,-1150,600)` on the cut sidewalk with the walkable `AGigLineCharacter`.