accepted

Native WebGPU Cached Clipmap Shadow Lab

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-cached-clipmap-shadow
Kind: Canonical Lab
Owning skill: Scalable Real-Time Shadows
Execution: rendering
Three.js: 0.185.1
Source hash: sha256:cb4d3abfaab1a84e0fbef28fd523befc0f09ed465690426c58eff739e7b1171c
Published bundle hash: sha256:72e144235093a27db006d320ace064ac03847d86675a96d56284aef9768ad47a
Build revision: sha256:348d7584a398e339bdf08ac952ded6eb67b5ed813416a6fe3ba445615164b63a
Renderer: WebGPURenderer
Backend: WebGPU
Evidence contract: v2
Tracked release bundle: Present

Claim verdicts

visualCorrectnessINSUFFICIENT_EVIDENCE

mechanismCorrectnessPASS

performanceComplianceNOT_CLAIMED

gpuAttributionNOT_CLAIMED

lifecycleStabilityPASS

visualErrorPASS

Promoted same-lab media

Native WebGPU Cached Clipmap Shadow Lab: Primary final readback. — **Primary final readback.**inspected-runtime-evidence-preview · sha256:53c2de2322e1015539b66714ee8251b122ce24f031d22a32c660050e7de5d791

Native WebGPU Cached Clipmap Shadow Lab: No-post / alternate display path readback. — **No-post / alternate display path readback.**inspected-runtime-evidence-preview · sha256:7b2a850fb71de0594aba9490507fc18fa6fd74b47bce0f0ad3849f539491d9e0

Native WebGPU Cached Clipmap Shadow Lab: Diagnostics / mechanism display readback. — **Diagnostics / mechanism display readback.**inspected-runtime-evidence-preview · sha256:32d731f0a9a800f4351f1936f3919d1f6560d04254a79b8cd6ddc83c4961198c

Required capability and runtime proof

Capabilities

native-webgpuaccepted

capture-session WebGPUBackend device identity + raw-capture-session evidence-manifest validates under current sourceHash.

comparison-depth-texturesincomplete

primary presentation capture only; specialized shadow-depth mechanism package remains residual.

Runtime proof

renderer-initaccepted

capture-session reports initialized===true and active device generation.

backend-is-webgpuaccepted

rendererBackendEvidence.isWebGPUBackend===true on correctness capture-session.

mechanism-reachableincomplete

final/no-post/diagnostics presentation modes captured; specialized clipmap diagnostics residual.

aligned-readbackaccepted

normalized/transport padded RGBA8 readbacks present for presentation targets.

receiver-consumes-committed-levelsincomplete

specialized candidate package residual.

actual-depth-resource-readbackincomplete

specialized shadow-depth diagnostic residual.

sequential-child-shadow-submissionsincomplete

specialized candidate package residual.

scheduler-fairnessincomplete

specialized scheduler diagnostic residual.

caster-visible-shadow-parityincomplete

specialized silhouette-parity diagnostic residual.

Capture state

Field	Published value
Primary route	`/demos/webgpu-cached-clipmap-shadow/`
Cameras	`near, design, far`
Seeds	`0x00000001, 0x9e3779b9`
Modes	`final, shadow-contribution, shadow-depth, level-centers, level-validity, scheduler, silhouette-parity, owner-graph`
Capture time	`Not present in the promoted report data`
Adapter identity	`{"source":"exact retained renderer.backend.device reference after renderer.init()","backendType":"WebGPUBackend","deviceType":"GPUDevice","deviceLabel":"","deviceIdentityVerified":true,"lossPromiseObservedOnActualDevice":true,"rendererDeviceGeneration":1}`
Raw readback hashes	`Not present in the promoted preview summary`

Fixed routes

Kind	Id	Startup state	Status
scenario	`persistent-coverage`	`{"scenario":"persistent-coverage","tier":"high","mode":"final"}`	accepted
scenario	`bounded-baseline`	`{"scenario":"bounded-baseline","tier":"high","mode":"final"}`	accepted
scenario	`depth-span`	`{"scenario":"depth-span","tier":"high","mode":"final"}`	accepted
scenario	`fixed-footprint`	`{"scenario":"fixed-footprint","tier":"high","mode":"final"}`	accepted
scenario	`slow-subtexel-pan`	`{"scenario":"slow-subtexel-pan","tier":"high","mode":"level-centers"}`	accepted
scenario	`bias-sweep`	`{"scenario":"bias-sweep","tier":"high","mode":"shadow-contribution"}`	accepted
scenario	`swept-caster-invalidation`	`{"scenario":"swept-caster-invalidation","tier":"high","mode":"level-validity"}`	accepted
scenario	`age-priority-round-robin`	`{"scenario":"age-priority-round-robin","tier":"high","mode":"scheduler"}`	accepted
scenario	`alpha-displaced-instanced-morph`	`{"scenario":"alpha-displaced-instanced-morph","tier":"high","mode":"silhouette-parity"}`	accepted
mechanism	`bounded-shadow`	`{"scenario":"bounded-baseline","tier":"high","mode":"final"}`	accepted
mechanism	`csm`	`{"scenario":"depth-span","tier":"high","mode":"final"}`	accepted
mechanism	`tiled-shadow`	`{"scenario":"fixed-footprint","tier":"high","mode":"final"}`	accepted
mechanism	`cached-clipmap`	`{"scenario":"persistent-coverage","tier":"high","mode":"final"}`	accepted
mechanism	`texel-snap-and-pan`	`{"scenario":"slow-subtexel-pan","tier":"high","mode":"level-centers"}`	accepted
mechanism	`bias-sweep`	`{"scenario":"bias-sweep","tier":"high","mode":"shadow-contribution"}`	accepted
mechanism	`targeted-invalidation`	`{"scenario":"swept-caster-invalidation","tier":"high","mode":"level-validity"}`	accepted
mechanism	`scheduler-fairness`	`{"scenario":"age-priority-round-robin","tier":"high","mode":"scheduler"}`	accepted
mechanism	`caster-position-parity`	`{"scenario":"alpha-displaced-instanced-morph","tier":"high","mode":"silhouette-parity"}`	accepted
tier	`high`	`{"tier":"high"}`	accepted
tier	`ultra`	`{"tier":"ultra"}`	accepted
tier	`reduced`	`{"tier":"reduced"}`	accepted

Locked tier contracts

high · accepted

{
  "targetClass": "current general-purpose WebGPU adapter",
  "frameTargetMs": {
    "value": 16.67,
    "unit": "ms",
    "label": "Gated",
    "source": "Authored 60 Hz frame allowance; current-adapter timing evidence pending"
  },
  "resolutionPolicy": {
    "width": 1920,
    "height": 1080,
    "dprCap": 1.5
  },
  "mechanismLimits": {
    "dynamicLevels": 2,
    "updateBudget": 2,
    "correctionBudget": 2,
    "maxCacheAgeFrames": 64
  },
  "resourceLimits": {
    "mapSizes": [
      1024,
      1024,
      1024,
      512,
      512,
      512,
      512
    ],
    "nominalMemoryGateBytes": 67108864
  },
  "degradationFromPrevious": [
    "reduce the two finest map dimensions",
    "reduce ordinary and correction update budgets"
  ],
  "preservedInvariants": [
    "receiver-backed child shadow nodes",
    "stable light basis",
    "correctness invalidation before age refresh",
    "one directional illumination owner"
  ]
}

ultra · accepted

{
  "targetClass": "current high-end WebGPU adapter",
  "frameTargetMs": {
    "value": 16.67,
    "unit": "ms",
    "label": "Gated",
    "source": "Authored 60 Hz frame allowance; current-adapter timing evidence pending"
  },
  "resolutionPolicy": {
    "width": 1920,
    "height": 1080,
    "dprCap": 2
  },
  "mechanismLimits": {
    "dynamicLevels": 2,
    "updateBudget": 3,
    "correctionBudget": 3,
    "maxCacheAgeFrames": 48
  },
  "resourceLimits": {
    "mapSizes": [
      2048,
      2048,
      1024,
      1024,
      512,
      512,
      512
    ],
    "nominalMemoryGateBytes": 134217728
  },
  "degradationFromPrevious": [],
  "preservedInvariants": [
    "receiver-backed child shadow nodes",
    "stable light basis",
    "correctness invalidation before age refresh",
    "one directional illumination owner"
  ]
}

reduced · accepted

{
  "targetClass": "binding and memory constrained WebGPU adapter",
  "frameTargetMs": {
    "value": 16.67,
    "unit": "ms",
    "label": "Gated",
    "source": "Authored 60 Hz frame allowance; target-adapter timing evidence pending"
  },
  "resolutionPolicy": {
    "width": 1280,
    "height": 720,
    "dprCap": 1
  },
  "mechanismLimits": {
    "dynamicLevels": 1,
    "updateBudget": 1,
    "correctionBudget": 1,
    "maxCacheAgeFrames": 96
  },
  "resourceLimits": {
    "mapSizes": [
      512,
      512,
      512,
      256,
      256,
      256,
      256
    ],
    "nominalMemoryGateBytes": 33554432
  },
  "degradationFromPrevious": [
    "halve shadow map dimensions",
    "update one dynamic and one queued level at a time"
  ],
  "preservedInvariants": [
    "receiver-backed child shadow nodes",
    "stable light basis",
    "correctness invalidation before age refresh",
    "one directional illumination owner"
  ]
}

Limitations

Correctness capture records native r185 WebGPUBackend with device identity proof.
Physical multi-scenario shadow matrix and GPU timestamps remain incomplete.
Named-adapter 60 Hz performance is NOT_CLAIMED.