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Recorded on 26 October 2026, unchanged since

Entry #130 of UpFork’s ledger · A lesson's version: ANGLE warns that dynamic indexing of a vector is emulated and slow: pick the component with ternaries Open it

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Recorded: 26 Oct 2026, 10:22 UTC
Signed with: k1 · Ed25519
Entry hash: 5f83503b3c9397c655b640245e5dd4da2d0379137c06be145b25ddf861ef0e1a
Before it: a1f2496a938af22abd846412f84bbc85724892946a8d0f6ca86e63df2bc3eabf
Record hash: 9414e9de4e52284cf6314605a603d57d57e3490047625e95bc7a637f5cb1e8ff
Signature: uhYiFh8rsxb4+7O1X+s3RNGZGnzAt8SXTtBOZ2rCg+11WCldE54QPmhk/poIB1BO38X9r3ZdX3aMERhpSwYjBw==

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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "article": "a-webgl-hero-in-a-web-worker-lightfall-s-lane-space-shader-offscreencanvas-a",
  "articleRevision": 1,
  "assumed": "reading a layer's values as `uLanes[L]` inside the loop over the three layers was as cheap as reading a field.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "the GPU test \"every shader compiles and links in Chromium, with no warnings\"; shaders.annotated.ts line 298.",
  "fix": "pick the component with ternaries, `L == 0 ? uLanes.x : (L == 1 ? uLanes.y : uLanes.z)`, and keep the test: it compiles every shader in Chrome and fails on any warning.",
  "happened": "Chrome on Windows (ANGLE over Direct3D 11) compiled it but left a warning in the shader's info log, on two lines of the scene shader: \"Performance: dynamic indexing of vectors and matrices is emulated and can be slow\". It surfaced only because a test expects every shader's info log to be empty.",
  "kind": "not-in-docs",
  "learnedBy": "ai",
  "lesson": "L-KGBB",
  "packages": "",
  "product": "crypto-web3-hero-section-react",
  "productRevision": 1,
  "publishedAt": "2026-10-26T10:21:58.532Z",
  "site": "https://upfork.dev",
  "title": "ANGLE warns that dynamic indexing of a vector is emulated and slow: pick the component with ternaries",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-KGBB",
  "version": 1,
  "why": ""
}