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ifcviewer: compose federation pipeline at SSBO upload

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InstanceCpu now carries both placement_transformation (raw streamer
output, the iterator's per-shape transform with vertex-rebasing offset
folded in) and transform (the composed FederatedFalseOrigin ·
ModelTransformation · CoordinateOperation · placement_transformation
result that lands in the SSBO).  World AABBs are recomputed from the
composed transform — frustum/BVH culling sees the actual rendered
position regardless of stage state.

ViewportWindow gains:
  - ModelGpuData::coordinate_operation_meters / model_transformation_meters
  - federated_false_origin_meters_ (federation-wide member)
  - composeInstanceFromPlacement / recomposeAndUploadModel helpers
  - public setFederatedFalseOrigin / setModelCoordinateOperation /
    setModelTransformation

Each setter rewrites the affected model's SSBO, refreshes the
reflection flags, and rebuilds the BVH.  Defaults are identity, so
behaviour is unchanged until something wires a setter up — that's
the next commit (MainWindow listening to Federation::dirtyChanged
and SceneLoader::modelGeoref ready signals).

Sidecar bumped 9 -> 10: InstanceCpu grew 104 B -> 168 B.  Existing
sidecars rebuild on next load.  v10 sidecars store
placement_transformation, so they remain reusable across .ifcfeds —
the composed transform on disk is overwritten with the right one
on load.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
Dion Moult
2026-05-01 20:41:25 +10:00
parent 92c3b4c308
commit 7f29850022
4 changed files with 204 additions and 8 deletions
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src/ifcviewer/SidecarCache.h
+8 -1
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@@ -46,7 +46,14 @@ static constexpr uint32_t SIDECAR_MAGIC = 0x49465657; // "IFVW"
// same cache serves either source format. Staleness is user-managed
// (delete the sidecar to force a rebuild).
// v9 = unused `reserved` field dropped from header (16 B -> 12 B).
static constexpr uint32_t SIDECAR_VERSION = 9;
// v10 = InstanceCpu gains placement_transformation[16] alongside transform[16]
// — record grew from 104 B to 168 B. placement_transformation is the
// raw streamer output; transform is the composed FederatedFalseOrigin ·
// ModelTransformation · CoordinateOperation · placement_transformation
// result. Sidecar serialises both; on load the transform is recomputed
// from placement_transformation + the ViewportWindow's current stage
// matrices, so v10 sidecars are reusable across .ifcfeds.
static constexpr uint32_t SIDECAR_VERSION = 10;
static constexpr uint32_t SIDECAR_ENDIAN = 0x01020304;
// Fixed-size element record. Strings are stored as (offset, length) pairs