WebGPU Directional Shadow Architecture Bench

12 open closure items. Loadable does not mean accepted or performance-valid.

1. P0Define and measure the target performance contract

   The high tier have no accepted frame target. Record named device/browser/GPU, viewport, DPR, sustained CPU/GPU/presentation p50 and p95, deadline misses, memory, and settled quality. Submission time is not GPU timing.

   tiers[].frameTargetMs
2. P0Native Webgpu capability proof

   Capture current-source evidence for the declared native webgpu gate.

   capabilityRequirements.native-webgpu
3. P0Comparison Depth Textures capability proof

   Capture current-source evidence for the declared comparison depth textures gate.

   capabilityRequirements.comparison-depth-textures
4. P0Timestamp Query capability proof

   Capture current-source evidence for the declared timestamp query gate.

   capabilityRequirements.timestamp-query
5. P0Renderer Init runtime proof

   Capture current-source evidence for the declared renderer init gate.

   runtimeProof.renderer-init
6. P0Backend Is Webgpu runtime proof

   Capture current-source evidence for the declared backend is webgpu gate.

   runtimeProof.backend-is-webgpu
7. P0Mechanism Reachable runtime proof

   Capture current-source evidence for the declared mechanism reachable gate.

   runtimeProof.mechanism-reachable
8. P0Aligned Readback runtime proof

   Capture current-source evidence for the declared aligned readback gate.

   runtimeProof.aligned-readback
9. P0Same Scene Architecture Comparison runtime proof

   Capture current-source evidence for the declared same scene architecture comparison gate.

   runtimeProof.same-scene-architecture-comparison
10. P0Actual Shadow Resource Inventory runtime proof

    Capture current-source evidence for the declared actual shadow resource inventory gate.

    runtimeProof.actual-shadow-resource-inventory
11. P1Capture a current-source evidence bundle

    Publish source-hash-bound renderer/backend facts, required diagnostic images, aligned readbacks, resource inventory, timing method, and limitations; directly inspect the important artifacts before promotion.

    evidenceBundle
12. P2Close tier-specific acceptance

    Validate and promote high as independent visual and performance contracts without crossing their protected invariants.

    tiers[].acceptanceStatus