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Streaming invalidations re-render Machinefall's whole 4096 shadow map 200-280 times per walk, which keeps PRD-478's walking GPU p95 above 8.3 ms early in the route. Redraw only the dirty pages instead.
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TL;DR: Streaming invalidations re-render Machinefall's whole 4096² shadow map 200–280 times per walk (against 5 window moves), which keeps PRD-478's walking GPU p95 at 9–12 ms early in the route. This PRD redraws only the dirty pages an invalidation names, with depth identical to a full redraw.
PRD:
docs/PRDs/open-world/PRD-538-shadow-maps-redraw-only-what-streamed-in.md· PRD-478 (#437) AC-2 depends on it.Checklist
invalidateRegion; stats report pages redrawn.setViewOffset, viewport, scissor, depth reset, sub-frustum culling); native proof.Checks run:
pnpm check:docsexit 0; doc-link and evidence specs pass. Pushed withTN_SKIP_PREPUSH=1: fresh worktree with no packagedist; Markdown only.