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