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Dion Moult
37fa4e9076
Split cullAndUploadVisible into cullModelCpu (CPU-only, thread-safe) and uploadCullResults (GL-only, main thread). render() fans the per-model culls out via std::async and joins before the serial upload pass. The cull scratch (vis_fwd/rev_lod0/1, visible_flat, indirect_scratch) moved onto ModelGpuData so each worker owns its output buffers. Phase timers and hiz_reject_count_ are atomic since workers fetch_add into them. A new wall-clock timer around the dispatch block reports the actual frame-time contribution; the existing clr/trv/emt counters are now documented as per-thread sums. Measured on the 18-model / 569k-instance test scene: wall-clock cull dropped from ~25 ms to ~5 ms while the aggregate CPU work (trv) stayed ~30 ms. Frame time 34 ms -> 19 ms. IFC_CULL_THREADS=0 forces the single-threaded fallback. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>