7555d5a1e0
Implements the §13 contract from the autotile-blob-styles design
paper (Rev 4):
- **Edge-replicated padding** (Rev 4 §13.3, mandatory): each tile
in the packed atlas gets a `--pad-px` ring (default 2) of edge-
replicated pixels. Inner content + UV coords unchanged; pack-
rects inflated by 2 * padPx before MaxRects. write.js's new
placeTileWithPadding helper handles both the inner-copy and
the edge-replicate sweep. Prevents bilinear-sampler bleed from
adjacent tiles in the atlas — was the green-flicker bug we
caught during 0.5.0c integration with vagrant-skeleton.
- **E1 — Schema slot validation**: new `--schema blob-14` flag
runs validateBlob14Sources against the source dir. Errors out
with clear "missing slot 7 (tee_full)" message if the 14 PNGs
don't match the canonical enumeration. New src/schema.js
module holds REQUIRED_SLOTS_BLOB14 + validateBlob14Sources +
validateBlob14Collision.
- **E2 — Collision sidecar**: bake.js looks for collision.json
in the source dir. If present + --schema blob-14: validate
14 slot entries exist via validateBlob14Collision. Copy
through to atlas output as tiles.collision.json (read by
consumer engines via the existing atlas-path resolver).
- **Opaque-flag alpha analysis** (powers lib-core.maps' opaque-
ceiling-cache in v0.5.0e): write.js's placeTileWithPadding
scans each tile's inner content for alpha === 255. If all
inner pixels are opaque, the tile entry in tiles.atlas.json
gets `"opaque": true`. Replaces lib-core.maps' slot-13-only
heuristic with real data.
Backwards-compat: pre-Rev-4 callers (test fixtures) use tile.w/h
without innerW/innerH. write.js falls back to w/h when innerW is
absent and padPx defaults to 0 — old code paths unchanged.
atlas_version bumped 1 -> 2 in tiles.atlas.json output. Consumers
key on atlas_id, not version, so this is a behavioural signal only.
Test surface: all 20 existing node:test cases still pass (pack +
scan + lock + 5 bake-* + write tests).
End-to-end verification: prototype-blob-geom re-baked through new
pipeline (8 atlases: 4 base styles + 3 tinted singles + testbench),
SPOREL_CI=1 vagrant-skeleton rc=0 with 60 render_frame_ok, no
magenta-placeholders or render-hook errors.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
sporel-tool-atlas-baker
Builds paired diffuse + height PNG atlases for the Sporel map-lib v0.3.0+ format.
Usage
sporel-atlas-baker \
--in <source-dir> \
--out <atlas-dir> \
--atlas-id <stable-id> \
[--tile-size 64] \
[--max-size 4096] \
[--lock <existing-lock.json>] \
[--blocks-sight-pattern <regex>]
See sporel-meta/docs/superpowers/specs/2026-05-21-map-multi-layer-design.md §4 for the format spec.
Development
npm install
npm test