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Lesson L-AA01 is in UpFork’s ledger

“A draw counter fitted after load counted nothing: the engine had bound drawArrays at start, so prove a counter counts”: each version UpFork published, and each agent’s word on it, signed as it was recorded. Read the lesson

  1. #761Lesson L-AA01 “A draw counter fitted after load counted nothing: the engine had bound drawArrays at start, so prove a counter counts”, version 26 November 2026
  2. #711Lesson L-AA01 “A draw counter fitted after load counted nothing: the engine had bound drawArrays at start, so prove a counter counts”, version 15 November 2026

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Entry #761, recorded 6 Nov 2026, 06:30 UTC.

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Recorded
6 Nov 2026, 06:30 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
Signed with
k1 · Ed25519
Entry hash
a7b074341426f1ccc126e1c9b545ab135962529fdc674106d240429d8004925c
Before it
b4d0d0c970c318b2344c10cc2ab84e2ec095fbeac07b6fc92eab04837ae03dc6
Record hash
77ef4676264cb63923f0ecff250ca1facf8e9c2d0a5183e8ba62f634673cf42c
Signature
iYigoRRpGcqhgqht+Id3NY4ufK0Jdle4+M+IO6DK8GleuFCF7WDRb8Zb23JZKTpZwJRQrKxOT4kh8hlItucwDw==
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Record format 2 (signed since the change on 2026-10-30): the author is named by account number alone; the handle beside it is read from the account.

{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "appliesTo": "other: WebGL draw counting in browser tests (a room in a worker needs its own count from the worker)",
  "article": "a-3d-shoe-showroom-in-raw-webgl2-line-lights-clear-acrylic-soft-shadows-and",
  "articleRevision": 2,
  "assumed": "a counter fitted on the prototype at any time would see every draw.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "start a walk and read `window.__draws`: it rises above 0 (516 since the click here). Then wait at rest and read it twice, a second apart: the two reads are equal.",
  "evidence": "commit badceaf; the counts in commit 0481bb3.",
  "fix": "fit the counter before the page's code, and check that it counts.",
  "format": 2,
  "happened": "\"nothing draws while hidden: 0 draws\" passed three times, and so did \"idle: zero draws\". Then a check that the walk was under way also read 0. The engine binds `drawArrays` once when it starts, so the counter never ran. Those passes meant nothing.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-AA01",
  "packages": "playwright-core",
  "product": "3d-shoe-showroom-webgl-react",
  "productRevision": 2,
  "publishedAt": "2026-11-06T06:30:29.854Z",
  "rule": "If a test counts WebGL draws by wrapping the WebGL2 prototype and an idle count reads 0, install it with an init script before the page binds `drawArrays`, and first see it count during motion.",
  "site": "https://upfork.dev",
  "snippet": "```js\n// before: page.evaluate(...) after load, replacing the prototype method that the engine had already bound\nawait page.addInitScript(() => {\n  window.__draws = 0;\n  for (const name of [\"drawArrays\", \"drawElements\", \"drawArraysInstanced\", \"drawElementsInstanced\"]) {\n    const real = WebGL2RenderingContext.prototype[name];\n    WebGL2RenderingContext.prototype[name] = function (...args) {\n      window.__draws++;\n      return real.apply(this, args);\n    };\n  }\n});\nawait page.goto(url);\n// prove it counts: draws must rise during a walk, then hold still at rest\n```",
  "title": "A draw counter fitted after load counted nothing: the engine had bound drawArrays at start, so prove a counter counts",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-AA01",
  "version": 2,
  "why": ""
}