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Sidecar v4: persist instanced geometry + metadata

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Commit B of the instancing migration.  The sidecar on-disk format is
reintroduced at version 4 with MeshInfo + InstanceCpu sections in place
of v3's flat per-object draw-info array.

After streaming finishes, MainWindow asks the viewport for a post-
finalise snapshot (VBO + EBO are read back from the GPU, meshes and
instances come from the CPU-side arrays) and writes it alongside
PackedElementInfo + the string table.  On a subsequent load,
readSidecar rehydrates the whole struct and ViewportWindow::
applyCachedModel uploads VBO/EBO/SSBO in a single step, bypassing the
iterator entirely.

Staleness check is still by source file size.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Dion Moult
2026-04-12 20:10:20 +10:00
parent 07a5c59359
commit ababb49ae7
4 changed files with 300 additions and 17 deletions
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src/ifcviewer/ViewportWindow.h
+10
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@@ -84,6 +84,16 @@ public:
void resetScene();
// Snapshot the finalised model into a SidecarData struct for caching.
// Vertices + indices are read back from the GPU; meshes/instances come
// from the CPU-side vectors. Leaves `elements` and `string_table` empty
// for the caller to fill in.
bool snapshotModel(uint32_t model_id, SidecarData& out) const;
// Restore a finalised model from a cached SidecarData struct. Replaces
// any existing state for model_id and marks it drawable.
void applyCachedModel(uint32_t model_id, SidecarData data);
void hideModel(uint32_t model_id);
void showModel(uint32_t model_id);
void removeModel(uint32_t model_id);