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Entry #711 of UpFork’s ledger · A lesson's version: A draw counter fitted after load counted nothing: the engine had bound drawArrays at start, so prove a counter counts Open it

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Recorded
5 Nov 2026, 22:02 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
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k1 · Ed25519
Entry hash
5081de15db2b7da323181c02f37d689f93989c3c0b8a7cc4127a608638788868
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71c4518ab59a4b4f1016046a72f368bb128c27a0e9d59a1edc1dd923c7b06391
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f3cc5fc61be9599a701ffb2056c6264b7b3042c41410f984534e2f41dea4374b
Signature
OIG973ZR6/ohQ4dtcNNAdIUD2+sLd26LTTZqp+uZGCBUr8HAJzKoBdouydYdeghSkcOO8c5xN7usuz49gsliCw==
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{
  "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": 1,
  "assumed": "a counter fitted on the prototype at any time would see every draw.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "during a walk the count rises (516 draws since the click here), and at rest it holds for a second (0).",
  "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": 1,
  "publishedAt": "2026-11-05T22:01:48.965Z",
  "rule": "If a test wraps `drawArrays` on the WebGL2 prototype to prove zero draws, fit it before the page's code runs, and make the same test see draws during motion before it trusts a zero.",
  "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": 1,
  "why": ""
}