3.3 KiB
Imaging and meshing integration
Milestone 06 owns the native implementations in libremetaverse-imaging,
libremetaverse-imaging-skia, and libremetaverse-prim-mesher. The core
imaging and meshing crates contain no CLR bridge, subprocess adapter, foreign
RPC, or generated failure-only shim. The rendering crates consume the checked
mesh data but remain a separate milestone: SimpleRenderer now provides the
reference prim/sculpt conversion pipeline. MeshFoundry now adds bounded mesh
asset, rigging, tangent, secondary-UV, terrain, and convex-hull handling without
changing the milestone 06 ownership boundary. See the
SimpleRenderer guide
and MeshFoundry guide.
Feature boundary
| Surface | Default build | Opt-in build | Native dependency |
|---|---|---|---|
| Managed images and TGA | enabled | n/a | none |
| JPEG 2000 | disabled | libremetaverse-imaging/jpeg2000 |
OpenJPEG 2.5.x |
| BMP/GIF/ICO/JPEG/PNG/WBMP/WebP | disabled | libremetaverse-imaging-skia/skia |
Skia |
| Prim and sculpt meshing, OBJ ingestion | enabled | n/a | none |
OpenJPEG is a non-default workspace member so release tooling can package the
adapter explicitly, and imaging reaches it only through the optional
dependency. Skia is likewise an optional, target-specific dependency. The
consolidated required Gitea gate exercises both optional features on
ubuntu-latest while its minimal-feature check proves that no native codec is
needed for the owned Rust and translated compatibility tests.
Bounds and rendering contract
Decoded images are limited to 4,096 by 4,096 pixels and encoded inputs to 64 MiB. Channel sizes, resize products, codec buffers, sculpt-map dimensions, profile/path sizes, mesh vertex counts, face indices, viewer groups, and OBJ indices use checked arithmetic before allocation or indexing. Malformed input returns a typed error.
The rendering-facing integration tests verify that PrimMesh and SculptMesh produce finite positions, normals, and UVs; aligned face and viewer-face data; preserved prim-face grouping; in-range indices; and the 16-bit index range used by the pinned MeshFoundry reference at every supported sculpt topology and LOD.
Reproducible gates
Run the fixed ownership and feature audit with:
python3 tools/check_milestone_06.py
The audit rejects owned Rust stubs, feature leakage, missing platform jobs, missing performance targets, or drift in the 48 reviewed ManagedImage, Coord/Quat, and PrimMesh compatibility cases. The required gate runs the native crate and reviewed parity tests, Clippy with warnings denied, and rustdoc with warnings denied. Benchmark compilation is retained in the non-routine release gate.
The focused performance baselines are executable Rust programs rather than wall-clock assertions, so slower shared runners do not weaken or destabilize correctness tests:
cargo bench -p libremetaverse-imaging --bench image_pipeline
cargo bench -p libremetaverse-prim-mesher --bench meshing
The image baseline clones, bilinearly resizes, and exports a 2,048-square RGBA image. The meshing baseline builds and indexes a high-detail cut, hollow, twisted circular extrusion. Both report elapsed time and allocation counts so regressions can be compared using the same inputs.