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wgpu backend: load .ifcview sidecars onto GPU buffers

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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>
This commit is contained in:
Dion Moult
2026-05-27 12:48:03 +10:00
parent 19a39a0413
commit 9daa5fe195
5 changed files with 325 additions and 5 deletions
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src/ifcviewer-wgpu-minimal/main.cpp
+11 -2
View File
@@ -36,8 +36,11 @@ int main(int argc, char* argv[]) {
QCommandLineParser parser;
parser.setApplicationDescription(
"IfcOpenShell minimal wgpu IFC viewer (stage 1: clear-color smoke test)");
"IfcOpenShell minimal wgpu IFC viewer (stage 2: sidecar load, no draw)");
parser.addHelpOption();
parser.addPositionalArgument("files",
"Sidecar (.ifcview) files to load. Stem-based: foo.ifc resolves to foo.ifcview.",
"[files...]");
parser.process(app);
auto* viewport = new WgpuViewportWindow;
@@ -47,10 +50,16 @@ int main(int argc, char* argv[]) {
container->setMinimumSize(320, 240);
QMainWindow main_window;
main_window.setWindowTitle("IfcViewer (wgpu) — stage 1");
main_window.setWindowTitle("IfcViewer (wgpu) — stage 2");
main_window.setCentralWidget(container);
main_window.resize(1280, 800);
main_window.show();
// Queue sidecars; they're loaded after wgpu init completes in
// exposeEvent. Ordering matches the command line.
for (const QString& path : parser.positionalArguments()) {
viewport->queueLoadSidecar(path);
}
return app.exec();
}