Architecture

Data path

Layers

Layer	Responsibility
Workers	Parse GeoJSON / ingest payloads; emit chunked ArrayBuffer views
FeatureStore	Feature id ↔ metadata, bbox queries, upsert/remove
GpuPointChunkSlot	Per-chunk vertex buffers + LRU participation
WebGpuPointsRenderer	Pipelines, uniforms, draw encoding, optional pick target
TextLayer / TextRenderer	CPU layout + MSDF/bitmap atlas + text draw pass

Chunked geometry

Design rules

• The renderer does not parse file formats — only dense buffers and uniforms.
• TypedArrays are the contract across thread boundaries; prefer Transferable ownership moves.
• Picking and text are optional subsystems with their own resources but share the same canvas pixel space.