accepted

Native WebGPU validation harness

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-validation-harness
Kind: Canonical Lab
Owning skill: Visual Validation
Execution: rendering
Three.js: 0.185.1
Source hash: sha256:c099d8c03b07280a4553e1ea687d4ca092809fba4efc5c67429b954c242359c7
Published bundle hash: sha256:95d5d07960dc5c166603d6f3fa0170f5b8a586a506e30b642b16877022554031
Build revision: sha256:d929feed6bb69df4ba0bca7a58c723f6c257d003c20d1e9417d25ccb25e4ecf9
Renderer: WebGPURenderer
Backend: WebGPU
Evidence contract: v2
Tracked release bundle: Present

Claim verdicts

visualCorrectnessPASS

mechanismCorrectnessPASS

performanceCompliancePASS

gpuAttributionPASS

lifecycleStabilityPASS

visualErrorPASS

Promoted same-lab media

Native WebGPU validation harness: Final presentation readback from the correctness lane. — **Final presentation readback from the correctness lane.**inspected-runtime-evidence-preview · sha256:4a02ce8c369fd0a8fc9416f392d0a1decbce7f377f238b07ae0db85b0a07c794

Native WebGPU validation harness: No-post baseline from the same locked route. — **No-post baseline from the same locked route.**inspected-runtime-evidence-preview · sha256:97918f2bb0666edfe4f6f5513fda9e39dd6448f967cef0d526996c82cf434902

Native WebGPU validation harness: Diagnostic mosaic proving distinct mechanism outputs. — **Diagnostic mosaic proving distinct mechanism outputs.**inspected-runtime-evidence-preview · sha256:c5f7614a27d9b8635a76e3abec2233a01288c86e4eec1ad192a978fd7775a485

Native WebGPU validation harness: Near camera fixed-view readback. — **Near camera fixed-view readback.**inspected-runtime-evidence-preview · sha256:52a0cc139fd69acf04f87c76d243ae51afb3211f6c1b95799116fb6544631955

Native WebGPU validation harness: Design camera fixed-view readback. — **Design camera fixed-view readback.**inspected-runtime-evidence-preview · sha256:4a02ce8c369fd0a8fc9416f392d0a1decbce7f377f238b07ae0db85b0a07c794

Native WebGPU validation harness: Far camera fixed-view readback. — **Far camera fixed-view readback.**inspected-runtime-evidence-preview · sha256:b86e6300205d33a80196513884f4a739d6957b570aa61d3c0d7ec54248ee1f63

Native WebGPU validation harness: Representative seed final frame. — **Representative seed final frame.**inspected-runtime-evidence-preview · sha256:4a02ce8c369fd0a8fc9416f392d0a1decbce7f377f238b07ae0db85b0a07c794

Native WebGPU validation harness: Stress seed final frame. — **Stress seed final frame.**inspected-runtime-evidence-preview · sha256:7c79d3065117a6e3838a4910ab2b8e36ff72e58fde061b3ab8a27cfa01a79912

Native WebGPU validation harness: Temporal sample t0. — **Temporal sample t0.**inspected-runtime-evidence-preview · sha256:4a02ce8c369fd0a8fc9416f392d0a1decbce7f377f238b07ae0db85b0a07c794

Native WebGPU validation harness: Temporal sample t1. — **Temporal sample t1.**inspected-runtime-evidence-preview · sha256:ce0e24010b49f1201ca720bc0002c6cefbae4ef49ae586f971dfa486f5a1bf21

Required capability and runtime proof

Capabilities

native-webgpuaccepted

renderer.backend.isWebGPUBackend after await renderer.init()

render-target-readbackaccepted

RGBA8 capture target copied through an aligned WebGPU row layout

Runtime proof

renderer-initaccepted

Native browser subject initialization and backend gate

backend-is-webgpuaccepted

Every correctness and physical route records renderer.backend.isWebGPUBackend === true after await renderer.init()

mechanism-reachableaccepted

Runtime graph inspection and all 19 immutable route locks prove the selected mechanism is reachable from the active output

render-or-compute-workaccepted

Measured scene and output submissions, native render-target pixels, and hardware timestamp populations prove executed GPU work

aligned-readbackaccepted

Retained transport and normalized readbacks record exact integer row strides, 256-byte alignment, byte lengths, and PNG hashes

mrt-readbackaccepted

Actual output, normal, and emissive render-target readback

schema-v2accepted

Fourteen semantic JSON artifacts plus required real images

lifecycleaccepted

50-100 create/render/resize/mode/tier/dispose cycles

Capture state

Field	Published value
Primary route	`/demos/webgpu-validation-harness/`
Cameras	`near, design, far`
Seeds	`0x00000001, 0x9e3779b9`
Modes	`final, no-post, normal, emissive`
Capture time	`Not present in the promoted report data`
Adapter identity	`Not promoted`
Raw readback hashes	`Not present in the promoted preview summary`

Fixed routes

Kind	Id	Startup state	Status
scenario	`browser-capture`	`{"scenario":"browser-capture"}`	accepted
scenario	`pipeline-graph-inspector`	`{"scenario":"pipeline-graph-inspector"}`	accepted
scenario	`resource-ledger`	`{"scenario":"resource-ledger"}`	accepted
scenario	`timing-and-governor`	`{"scenario":"timing-and-governor"}`	accepted
scenario	`lifecycle-and-leaks`	`{"scenario":"lifecycle-and-leaks"}`	accepted
scenario	`visual-error-metrics`	`{"scenario":"visual-error-metrics"}`	accepted
scenario	`mutation-gallery`	`{"scenario":"mutation-gallery"}`	accepted
scenario	`artifact-inspector`	`{"scenario":"artifact-inspector"}`	accepted
mechanism	`aligned-readback`	`{"scenario":"browser-capture","mode":"final"}`	accepted
mechanism	`claim-verdicts`	`{"scenario":"artifact-inspector","mode":"emissive"}`	accepted
mechanism	`gpu-timestamps`	`{"scenario":"timing-and-governor","mode":"final"}`	accepted
mechanism	`resource-inventory`	`{"scenario":"resource-ledger","mode":"normal"}`	accepted
mechanism	`visual-errors`	`{"scenario":"visual-error-metrics","mode":"normal"}`	accepted
mechanism	`lifecycle-trend`	`{"scenario":"lifecycle-and-leaks","mode":"final"}`	accepted
tier	`schema-fixture`	`{"tier":"schema-fixture"}`	accepted
tier	`webgpu-correctness`	`{"tier":"webgpu-correctness"}`	accepted
tier	`target-performance`	`{"tier":"target-performance"}`	accepted
tier	`governor-stress`	`{"tier":"governor-stress"}`	accepted
tier	`release`	`{"tier":"release"}`	accepted

Locked tier contracts

schema-fixture · accepted

{
  "targetClass": "schema-transport-only",
  "frameTargetMs": null,
  "resolutionPolicy": {
    "scenePassScale": 1,
    "dprCap": 1
  },
  "mechanismLimits": {
    "runtimeClaims": 0
  },
  "resourceLimits": {
    "publishable": false
  },
  "degradationFromPrevious": [],
  "preservedInvariants": [
    "schema v2",
    "claim separation",
    "fixture quarantine"
  ]
}

webgpu-correctness · accepted

{
  "targetClass": "current-adapter-correctness",
  "frameTargetMs": null,
  "resolutionPolicy": {
    "scenePassScale": 1,
    "dprCap": 2
  },
  "mechanismLimits": {
    "mrtAttachments": 3
  },
  "resourceLimits": {
    "lifecycleCyclesMinimum": 50,
    "lifecycleCyclesMaximum": 100
  },
  "degradationFromPrevious": [],
  "preservedInvariants": [
    "native WebGPU",
    "real MRT",
    "aligned readback",
    "one output owner"
  ]
}

target-performance · accepted

{
  "targetClass": "current-adapter-performance",
  "frameTargetMs": {
    "value": 16.67,
    "unit": "ms",
    "label": "Gated",
    "source": "60 Hz current-adapter release target"
  },
  "resolutionPolicy": {
    "scenePassScale": 1,
    "dprCap": 1
  },
  "mechanismLimits": {
    "gpuTimestampsRequired": true
  },
  "resourceLimits": {
    "sustainedTraceRequired": true
  },
  "degradationFromPrevious": [],
  "preservedInvariants": [
    "native WebGPU",
    "timestamp-backed GPU attribution"
  ]
}

governor-stress · accepted

{
  "targetClass": "current-adapter-governor-stress",
  "frameTargetMs": {
    "value": 16.67,
    "unit": "ms",
    "label": "Gated",
    "source": "60 Hz current-adapter release target"
  },
  "resolutionPolicy": {
    "scenePassScale": 0.5,
    "dprCap": 1
  },
  "mechanismLimits": {
    "governorTraceRequired": true
  },
  "resourceLimits": {
    "oscillationAllowed": false
  },
  "degradationFromPrevious": [
    "scene pass resolution scale reduced to 0.5"
  ],
  "preservedInvariants": [
    "native WebGPU",
    "MRT semantics",
    "output ownership"
  ]
}

release · accepted

{
  "targetClass": "current-adapter-release-aggregation",
  "frameTargetMs": null,
  "resolutionPolicy": {
    "scenePassScale": 1,
    "dprCap": 1
  },
  "mechanismLimits": {
    "releaseAggregation": true,
    "performanceEvidenceTier": "target-performance",
    "governorEvidenceTier": "governor-stress"
  },
  "resourceLimits": {
    "lifecycleCyclesMinimum": 50,
    "lifecycleCyclesMaximum": 100
  },
  "degradationFromPrevious": [],
  "preservedInvariants": [
    "native WebGPU",
    "schema v2",
    "real images",
    "lifecycle stability"
  ]
}

Limitations

Tracked release projection binds the approved correctness, physical-route, and performance lanes to the current source closure.
Promoted gallery images are the retained standard correctness readbacks from the accepted release bundle.
Opaque renderer-internal residency remains unclaimed beyond lab-owned resource ledgers.