Axel Meyer 8a75aee48a Rewrite load_textures for paired-PNG atlas format ...

Replaces the per-tile texture-handle pattern with per-atlas handles
plus per-tile UV-rects. Each map-lib atlas record now holds a tiles-by-
id dictionary loaded from tiles.atlas.json and two texture handles
(diffuse + height) loaded from the paired PNGs. Tile-records expose
{id, name, uv, blocks_sight} fields; the breaking-change to numeric id
+ named name flows to all consumers in this slice.

Adds get_layer_diffuse_texture and get_layer_height_texture that
aggregate to a single handle when every cell in a layer references the
same atlas, returning nil for multi-atlas layers so lighting can fall
back to per-cell sampling.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-21 22:57:12 +02:00

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