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ifcviewer-web: stream remote sidecars over HTTP Range (?model=URL)

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Adds a network byte-source alongside the local Blob one. The async-chunk
infra is source-agnostic — only the two JS primitives knew it was a Blob —
so this generalises them and reuses everything else:

  - ifcvReadRangeInto: local → Blob.slice; remote → fetch() with a Range
    header (206). If a server ignores Range and returns 200, the requested
    window is sliced out so it still works (without the bandwidth saving).
  - ifcvFileSize: Blob size, or the URL's total length resolved up front.
  - ifcvBeginUrlSource: resolves total size (HEAD Content-Length, else a
    0-0 ranged GET's Content-Range) then fires _ifcv_source_ready.
  - The metadata bootstrap is extracted into a source-agnostic
    loadSidecarMetadataWeb(label); loadSidecarFromBlobWeb / FromUrlWeb are
    thin entries. streaming_from_blob → streaming_from_web (now covers both).

main_web exports load_sidecar_from_url_c(url); shell.html reads a
?model=URL query param and ccalls it once the app is live (same-origin
needs no CORS; cross-origin hosts must send CORS + Accept-Ranges).

Test: serve.mjs now answers HEAD + Range (206) and falls back to the
ifcviewer-web source dir for sample.ifcview (embedded in the wasm, not in
build-web). New smoke case loads ?model=/sample.ifcview and asserts it
renders via the Range path. 6/6 web smoke + 107/107 unit pass; desktop
unaffected (web-guarded; only the shared field rename touches it).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Dion Moult
2026-06-30 12:44:37 +10:00
parent bc31e91e35
commit 23dc5dac48
8 changed files with 260 additions and 66 deletions
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src/ifcviewer-web/CMakeLists.txt
+8 -5
View File
@@ -98,11 +98,14 @@ target_link_options(IfcViewerWeb PRIVATE
"-sEXIT_RUNTIME=0"
# Expose the C entry points to JS. _raf_tick_c drives the RAF loop
# (shell.html); _load_sidecar_from_blob_c loads a user-picked File via
# byte-range Blob.slice reads; _ifcv_on_range_done is the completion
# callback the JS range reader invokes when a slice has landed in the
# heap. EMSCRIPTEN_KEEPALIVE alone keeps the symbols in the binary but
# doesn't add them to Module.
"-sEXPORTED_FUNCTIONS=['_main','_raf_tick_c','_load_sidecar_from_blob_c','_ifcv_on_range_done']"
# byte-range Blob.slice reads; _load_sidecar_from_url_c streams a remote
# sidecar via HTTP Range; _ifcv_on_range_done / _ifcv_source_ready are the
# JS→C completion callbacks for a landed range / a resolved URL size.
# EMSCRIPTEN_KEEPALIVE alone keeps the symbols in the binary but doesn't
# add them to Module. ccall lets shell.html pass a JS string (the ?model
# URL) to load_sidecar_from_url_c without manual heap marshalling.
"-sEXPORTED_FUNCTIONS=['_main','_raf_tick_c','_load_sidecar_from_blob_c','_load_sidecar_from_url_c','_ifcv_on_range_done','_ifcv_source_ready']"
"-sEXPORTED_RUNTIME_METHODS=['ccall']"
# Streaming + chunked geometry want a heap that can grow as buffers
# arrive. 256 MB initial, 2 GB ceiling (matches the wasm32 pointer
# cap; --shared64 / MEMORY64 would lift this later if we need it).