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Dion Moult
9daa5fe195
Stage 2 of the wgpu port. WgpuViewportWindow gains a queueLoadSidecar API (called from the minimal driver before init) and an applyCachedModel that runs after init: reads via SidecarCache::readSidecar, allocates four wgpu buffers per model (vertex storage, index, mesh-quant storage, instance storage), uploads via wgpuQueueWriteBuffer, retains a CPU mirror of the MeshInfo/InstanceCpu arrays for the cull and picking paths that arrive in later stages. MeshGpu (the per-mesh quantization basis) is derived from MeshInfo on the fly; InstanceGpu (transform + ids) is derived from InstanceCpu and uses the cached float transform — composing from placement_transformation against federation-stage matrices lands when stage 5 wires those. SidecarCache.cpp is compiled into IfcViewerWgpu directly: it's pure C++ with no Qt/OCCT/IFC-parse deps, so dragging in the IfcViewer static lib for one source file would be wasteful. This duplication goes away once src/ifcviewer-core/ is extracted (task #12). Verified on a synthesised v13 sidecar (4 verts, 6 indices, 1 mesh, 1 instance) and a multi-sidecar load that assigns successive model_ids. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>