perf(viewer2d): toggle layers by visibility instead of reloading the drawing

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setHiddenLayers() called load(result, {keepView:true}), so every layer
on/off re-parsed and re-tessellated the whole drawing — arc sampling,
hatch triangulation, complex linetypes and the Slug text batch all rebuilt
from scratch. On an 18 MB DWG a single eye-icon click took 5 s+.

Build every layer once, then switch geometry on and off:

- Merged LineSegments buffers get an index buffer plus a per-segment layer
  id (_registerIndexed). A toggle rewrites the index and setDrawRange;
  positions, colors and lineDistances are untouched, so draw order, dash
  phase and the selection-highlight offsets in meta.colStart stay valid.
- Per-entity meshes (hatch fills, SOLID quads, arrowheads, OLE images,
  sprites) are tagged by layer via _addObj and toggled with .visible.
- Slug text builds one merged mesh per CAD layer instead of one per
  draw order, so text hides with a visible flag. The shader source is
  identical across batches, so three still shares one WebGLProgram.
- Hidden geometry stays in the pick buffers, so _onClick now skips it via
  the _metaHidden mask.
- Fit keeps framing only what is drawn: per-layer Box3 + fit samples are
  recorded at build and unioned over the visible layers.
- getLayerInfo() caches the O(entities) name/color/count pass per load;
  only the visible flag is recomputed.

Layer panel: one delegated click listener instead of re-binding a handler
per row, and a toggle patches the affected row's opacity/icon in place
rather than regenerating the whole list's innerHTML.

Trade-off: hidden layers are now built and kept in memory, so loading a
file with layers already off costs what a full load costs.

Rebuilds dist2.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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This commit is contained in:

minsung

2026-08-04 14:08:59 +09:00

co-authored by Claude Opus 5

parent fb8f7ca4eb

commit 3480945b5a

4 changed files with 5900 additions and 88 deletions

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dist2/assets/index-KG0HO38y.js

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