accepted

WebGPU Directional Shadow Architecture Bench

This report separates published implementation state from accepted evidence. Every value below comes from the schema-v2 registry, the emitted source manifest, or promoted same-lab artifacts.

Open demo Owning skill Published source manifest Registry JSON Promoted evidence summary Tracked v2 bundle manifest Canonical source

Lab id: webgpu-shadow-architecture-bench
Kind: Mechanism Demo
Owning skill: Scalable Real-Time Shadows
Execution: rendering
Three.js: 0.185.1
Source hash: sha256:b5720ffcb576439ae355f3ce8334a1d5c572150b82563c85bf2276b91012cf53
Published bundle hash: sha256:21a9ced5ef641afdfebe8644702893de9846c1b98a77967daf9749819781a3c5
Build revision: sha256:d929feed6bb69df4ba0bca7a58c723f6c257d003c20d1e9417d25ccb25e4ecf9
Renderer: WebGPURenderer
Backend: WebGPUBackend
Evidence contract: v2
Tracked release bundle: Present

Claim verdicts

visualCorrectnessPASS

mechanismCorrectnessPASS

performanceComplianceNOT_CLAIMED

gpuAttributionNOT_CLAIMED

lifecycleStabilityPASS

visualErrorPASS

Promoted same-lab media

WebGPU Directional Shadow Architecture Bench: Final shadow composite — **Final shadow composite**inspected-runtime-evidence-preview · sha256:9044c9c72c63dd7e3e114197c6cdd507649a51780a540c5c450cc0c7d9b3f33d

WebGPU Directional Shadow Architecture Bench: Shadow contribution / no-post path — **Shadow contribution / no-post path**inspected-runtime-evidence-preview · sha256:6b8def79577043c4d29798ad0e75807f08149f106c33da37168b6364f72efaf1

WebGPU Directional Shadow Architecture Bench: Owner-graph diagnostics — **Owner-graph diagnostics**inspected-runtime-evidence-preview · sha256:e0dacf0308a15369995921bebd78ec12da2b4b57568f8ca278eb1d8ce0ca2237

WebGPU Directional Shadow Architecture Bench: Near camera — **Near camera**inspected-runtime-evidence-preview · sha256:3e8567a2286d686001092a1aa81f463bfe17a89c5d9f7d13e6e7c1ed8c7db9ea

WebGPU Directional Shadow Architecture Bench: Design camera — **Design camera**inspected-runtime-evidence-preview · sha256:9044c9c72c63dd7e3e114197c6cdd507649a51780a540c5c450cc0c7d9b3f33d

WebGPU Directional Shadow Architecture Bench: Far camera — **Far camera**inspected-runtime-evidence-preview · sha256:46f9029478bfce8fc365140572e89f9676f01bfa0287dad8b75bca63207f56a7

WebGPU Directional Shadow Architecture Bench: Seed 0x1 final — **Seed 0x1 final**inspected-runtime-evidence-preview · sha256:9044c9c72c63dd7e3e114197c6cdd507649a51780a540c5c450cc0c7d9b3f33d

WebGPU Directional Shadow Architecture Bench: Seed 0x9e3779b9 final — **Seed 0x9e3779b9 final**inspected-runtime-evidence-preview · sha256:6e505b94f2a9274b6980bc644e4ac020636072d5c89100f5b4fac50c44944472

WebGPU Directional Shadow Architecture Bench: Temporal t0 — **Temporal t0**inspected-runtime-evidence-preview · sha256:9044c9c72c63dd7e3e114197c6cdd507649a51780a540c5c450cc0c7d9b3f33d

WebGPU Directional Shadow Architecture Bench: Temporal t1 — **Temporal t1**inspected-runtime-evidence-preview · sha256:455f6c2fc01079e564bf8a4a78c8d2d910ec426aaab0c85ba47a62513237e4ac

Required capability and runtime proof

Capabilities

native-webgpuaccepted

renderer backend gate after initialization

comparison-depth-texturesaccepted

directional shadow map comparison sampling path

Runtime proof

renderer-initaccepted

await renderer.init() in canonical browser controller

backend-is-webgpuaccepted

renderer.backend.isWebGPUBackend === true

mechanism-reachableaccepted

architecture scenarios change shadow owner/resources on the same fixture

aligned-readbackaccepted

capturePixels derives integer 256-byte-aligned row stride

same-scene-architecture-comparisonaccepted

bounded/csm/tiled/cached scenarios share the same fixture and route through architecture owners

actual-shadow-resource-inventoryaccepted

describeResources inventories live shadow depth targets for the active architecture

render-or-compute-workaccepted

unified-v2 approved release: correctness capture + CDP Chrome hardware physical-route review + offline visual signoff

Capture state

Field	Published value
Primary route	`/demos/webgpu-shadow-architecture-bench/`
Cameras	`near, design, far`
Seeds	`0x00000001, 0x9e3779b9`
Modes	`final, shadow-depth, owner-graph`
Capture time	`Not present in the promoted report data`
Adapter identity	`{"source":"LabController.getMetrics","backendType":"WebGPU","deviceType":"unknown","deviceLabel":"","deviceIdentityVerified":false}`
Raw readback hashes	`Not present in the promoted preview summary`

Fixed routes

Kind	Id	Startup state	Status
scenario	`bounded`	`{"scenario":"bounded","tier":"high","mode":"final"}`	accepted
scenario	`csm`	`{"scenario":"csm","tier":"high","mode":"final"}`	accepted
scenario	`tiled`	`{"scenario":"tiled","tier":"high","mode":"final"}`	accepted
scenario	`cached`	`{"scenario":"cached","tier":"high","mode":"final"}`	accepted
mechanism	`bounded-shadow`	`{"scenario":"bounded","tier":"high","mode":"final"}`	accepted
mechanism	`csm`	`{"scenario":"csm","tier":"high","mode":"final"}`	accepted
mechanism	`tiled-shadow`	`{"scenario":"tiled","tier":"high","mode":"final"}`	accepted
mechanism	`cached-clipmap`	`{"scenario":"cached","tier":"high","mode":"final"}`	accepted
tier	`high`	`{"tier":"high"}`	accepted

Locked tier contracts

high · accepted

{
  "targetClass": "current WebGPU adapter",
  "frameTargetMs": null,
  "resolutionPolicy": {
    "width": 1200,
    "height": 800,
    "dpr": 1
  },
  "mechanismLimits": {
    "architectureCount": 4,
    "fixedTier": "high"
  },
  "resourceLimits": {
    "inventorySource": "runtime-owned shadow targets"
  },
  "degradationFromPrevious": [],
  "preservedInvariants": [
    "identical seeded receiver/caster scene",
    "normal depth for the stock r185 tile comparison",
    "one directional illumination owner"
  ]
}

Limitations

Correctness and CDP Chrome hardware physical-route visual review pass on the current source closure.
Named-adapter GPU timestamp timing remains NOT_CLAIMED.