Cluster LOD 1b: GPU cut selection, culling and draw emission (MDI floor, mesh-shader tier) #745

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opened 2026-10-13 01:57:40 +00:00 by sky_line · 2 comments

sky_line commented

2026-10-13 01:57:40 +00:00

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Part of #642. Wave 1. Depends on the wave-0 contract.

Compute selection: per cluster, render iff its own projected error <= tolerance < its parent's; frustum, Hi-Z occlusion and backface-cone culling.
Request buffer for missing finer pages (consumed by 1c).
Emission tiers: compute + multi-draw indirect (floor, every supported GPU); mesh/task shaders (VK_EXT_mesh_shader); device-generated commands where they help.
Per-view entry point (main view first; shadow cascades, probe faces and snapshots wired in group 3).

Rules for this work (all sub-tickets):

Behind RenderVKClusterLOD (default off). With it off, the existing rigged LOD controller (#561 / #613) and every current path are untouched.
Newest path first, chosen by extension presence; every slower path is an additive fallback, forceable on the newest card via RenderVKClusterForceTier.
Failures never crash: a missing page / failed allocation falls back to the coarser parent cut; no unbounded growth (fixed pools, byte budgets, live/cap/peak stats).

Part of #642. **Wave 1.** Depends on the wave-0 contract. - Compute selection: per cluster, render iff its own projected error <= tolerance < its parent's; frustum, Hi-Z occlusion and backface-cone culling. - Request buffer for missing finer pages (consumed by 1c). - Emission tiers: compute + multi-draw indirect (floor, every supported GPU); mesh/task shaders (VK_EXT_mesh_shader); device-generated commands where they help. - Per-view entry point (main view first; shadow cascades, probe faces and snapshots wired in group 3). **Rules for this work (all sub-tickets):** - Behind `RenderVKClusterLOD` (default off). With it off, the existing rigged LOD controller (#561 / #613) and every current path are untouched. - Newest path first, chosen by extension presence; every slower path is an additive fallback, forceable on the newest card via `RenderVKClusterForceTier`. - Failures never crash: a missing page / failed allocation falls back to the coarser parent cut; no unbounded growth (fixed pools, byte budgets, live/cap/peak stats).

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