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Revert "ifcviewer: GPU cull drives rendering under IFC_GPU_CULL=1"

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This reverts commit 4fe32b54105ca2c5c00290603db17164837211e1.
This commit is contained in:
Dion Moult
2026-04-17 18:34:01 +10:00
parent 175efcfffe
commit 9aae8f0329
3 changed files with 73 additions and 322 deletions
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src/ifcviewer/README.md
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@@ -793,16 +793,6 @@ single giant model / <18 cores CPU BVH trv Phase 3E GPU cull (plann
- [x] Phase 3D — Parallel per-model CPU cull (`std::async` fan-out)
- [x] Quantized VBO (16 B/vert, sidecar v6)
- [x] Event-driven rendering (zero idle CPU/GPU, cull skipped on still frames)
- [~] **Phase 3E — GPU-side compute-shader culling** (in progress)
- [x] 3a: `IFC_GPU_CULL=1` drives rendering via compute cull (frustum +
contribution, single bucket per mesh). Correctness matches CPU
path; perf regressed — we submit one sub-draw per mesh even
when `instanceCount=0`. Fix is MDI compaction via
`glMultiDrawElementsIndirectCount`, deferred to 3a-followup so
we don't pull a GL 4.6 entrypoint loader into this commit.
- [ ] 3a-followup: compact non-empty commands, use count-buffer MDI
- [ ] 3b: fwd/rev reflection bucketing on GPU
- [ ] 3c: LOD0/LOD1 selection on GPU
- [ ] 3d: HiZ with same-frame depth pre-pass
- [ ] **Phase 3E — GPU-side compute-shader culling** (next; replaces the HiZ readback)
- [ ] Vulkan/MoltenVK backend for macOS
- [ ] Embedded Python scripting console