Reverses the internal resolved-atlas representation back to the
v2 on-disk shape (atlas_aliases as strings, only whitelisted layers
emitted, roof key omitted when nil). Hand-rolled JSON stringifier
because the engine exposes no cjson Lua binding and load_json has
no symmetric save_json counterpart. Output is byte-deterministic
(sorted object keys) and pretty-printed with 2-space indent.
Validates layer name against VALID_LAYER_NAMES, bounds-checks the
target cell, auto-allocates the layer table if the caller writes
to a previously-empty layer. Marks the map as dirty for callers
that track in-memory mutations.
When a consumer renders via maps.draw_map_pre/post_entities without
having called maps.load_textures (or when asset-alias resolution
failed), the per-atlas diffuse_texture_handle is nil. The previous
draw_layer passed nil to draw_sprite_transform and crashed. Now it
falls back to engine.render.draw_rect with the classic magenta
missing-asset color so the consumer sees the gap visually instead.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
When an atlas declares tile_size_px = null (variable-size tiles), the
load_textures call was overwriting the map's tile_size with nil, causing
an arithmetic error in draw_layer on the first render frame.
Guard the tile_size update so it only applies when tile_size_px is
non-nil; maps using variable-size atlases keep their tile_size from
the stub default (32) set at load time.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
draw_layer now samples tile sub-rectangles from the atlas diffuse
texture via the ADR-0044 source-rect render primitive (13-arg
draw_sprite_transform). load_textures gains a walkable field in
tile-records (from atlas JSON) so gameplay queries work after the
tiles-dir is removed. load_tilemap falls back to an atlas-bootstrap
stub when the legacy tilemap JSON is absent, allowing maps.load to
succeed before load_textures is called. Texture loading uses pcall
to degrade gracefully in headless environments. Bumps lib version to
0.3.0 to flag the breaking change in tile-record shape (id is now
integer, name is the stable string identifier).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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>
Update README.md to version 0.2.0: add API entries for the 16 new
public functions (encode_gid, decode_gid, upgrade_v1_to_v2,
validate_map_table_v2, atlas_count, atlas_id_at, has_layer, is_indoor,
cell_gid, tile_at_layer, blocks_walk, blocks_sight,
iterate_layers_pre_entities, iterate_layers_post_entities,
draw_map_pre_entities, draw_map_post_entities), add the schema-v2
reference section documenting layer-stack, packed-u32 GID bit layout,
auto-migration, and a v0.2.0 changelog entry.
Fix tile-id OOB validation regression in build_map_v2: after v1->v2
upgrade, packed GIDs were not checked against atlas palette sizes.
Restore the check in build_map_v2 so loading a map with an out-of-range
tile_id still produces a fatal error with the same message pattern.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
M.load now auto-upgrades v1 maps to v2 shape (no m.tilemap field), but
load_textures still dereferenced m.tilemap unconditionally and crashed on
every v2 consumer. Extract per-tilemap loop into a helper and dispatch by
schema_version.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Adds LAYER_ORDER_PRE/POST_ENTITIES constants, iterate_layers_pre/post_entities
helpers, draw_layer and draw_v1_legacy locals, and draw_map_pre/post_entities
public functions. draw_map becomes a backward-compat wrapper over both.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Replace the v1 is_walkable stub with a v2-aware version that requires
surface tile present and no blocking wall layer cell. Add blocks_walk
(wall-layer OOB-safe check) and blocks_sight (wall + upper_wall with
per-tile blocks_sight override). v1 path unchanged via schema_version
branch.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Introduces M.tile_at_layer(layer_name, x, y, map_id) for direct per-layer
tile lookup with proper atlas resolution. Refactors the v2 branch of M.tile_at
to delegate to tile_at_layer("surface", ...) instead of duplicating the GID
decode logic inline.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Adds M.cell_gid(layer_name, x, y, map_id) to read raw GID values from
named layers, enabling callers to decode atlas/tile/rotation from any
layer without going through tile_at().
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Replace the v1-only M.load path with a unified v2 load path that
auto-upgrades v1 JSON on read. Add build_map_v2 to produce map records
with atlases[], layers{}, and roof arrays. Add atlas_count, atlas_id_at,
has_layer, and is_indoor to the public API. Update tile_at to decode GIDs
from the surface layer for v2 maps, keeping M.create/build_map for
programmatic callers that supply a v1-style tilemap_table directly.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Adds validate_map_table_v2 — enforces schema_version=2, required
fields (id, size, atlases), non-empty atlases[], per-layer tile-count
check against w*h, and a VALID_LAYER_NAMES whitelist that logs a
warning for unknown layers instead of rejecting them.
Moves require_field before the v2 validator so it is in scope at
call time. engine.warn replaced with engine.print (no warn binding).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Converts legacy single-tilemap maps (tiles[], tile_rotations[]) into the
schema-v2 format (atlases[], layers.surface with packed GID cells).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
encode_gid / decode_gid pack atlas_index (8 bits), tile_id (20 bits), and
rotation (2 bits) into a single u32; gid == 0 is reserved as the empty-cell
sentinel. Lua 5.4 native bitwise operators used throughout.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Sprite-mode in draw_map:
- tilemap-tiles with texture atlas-id render via
engine.render.draw_sprite_transform with rotation pivot at tile center
- tiles without texture continue to render via draw_rect with color
(Phase 1 mode preserved)
Tile rotation:
- maps support an optional tile_rotations parallel array in the map
JSON with per-cell 90-degree rotation values (0/90/180/270)
- absent or nil entries default to 0 (no rotation)
- enables 9-segment tile reuse via rotation rather than per-orientation
sprites
New API:
- maps.load_textures(asset_aliases) resolves the current tilemap's
tile atlas-ids to texture-handles via the asset-lib indirection
(asset_aliases[tilemap.asset_pack] -> lib-id -> atlas.json lookup
per tile)
Schema additions:
- tilemap.asset_pack (alias-key, optional)
- tile.texture (atlas-id, optional)
- map.tile_rotations (parallel array, optional)
All existing Phase 1 color-only tilemaps render unchanged.
Pre-existing bug: split_namespaced_id used first-dot-split. For modules
with dotted IDs (e.g. lib-core.maps-test), this misclassified
'<dotted-module-id>.<tilemap-name>' as cross-lib reference.
Replaced with split_local_tilemap() that matches by exact current-
module-id prefix. Module-id can now have arbitrary dots.
Surfaced by P.3.1 reference test-module 'lib-core.maps-test' which
has a dotted module-id.
