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Revert "ifcviewer: MDI compaction via glMultiDrawElementsIndirectCount"

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This reverts commit d5b7b87ba17c90008cf0673c838ce8431ad85e36.
This commit is contained in:
Dion Moult
2026-04-17 18:34:01 +10:00
parent 4bedb40d8a
commit fc89ffeb19
3 changed files with 40 additions and 202 deletions
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src/ifcviewer/README.md
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@@ -809,12 +809,9 @@ single giant model / <18 cores CPU BVH trv Phase 3E GPU cull (plann
Occlusion halves survivors on dense interiors. Depth
pre-pass has same CP overhead as color pass (690k empty
sub-draws); cost dominated by MDI command processing.
- [x] MDI compaction — pack compute shader compacts non-empty
commands into contiguous fwd/rev ranges; drawn via
`glMultiDrawElementsIndirectCount` (GL 4.6 /
`ARB_indirect_parameters`, loaded via `getProcAddress`).
Eliminates ~690k empty sub-draws from both depth pre-pass
and color pass. Falls back to uncompacted MDI when the
entrypoint is unavailable.
- [ ] MDI compaction — compact non-empty commands into contiguous
buffer, use `glMultiDrawElementsIndirectCount` (GL 4.6 /
`ARB_indirect_parameters`). Deferred until all feature buckets
land so we can introduce GL 4.6 loading once, cleanly.
- [ ] Vulkan/MoltenVK backend for macOS
- [ ] Embedded Python scripting console