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Entry #710 of UpFork’s ledger · A lesson's version: WEBGL_lose_context: keep the extension object you lost the context with, and restore through it Open it

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Recorded
5 Nov 2026, 22:02 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
Signed with
k1 · Ed25519
Entry hash
71c4518ab59a4b4f1016046a72f368bb128c27a0e9d59a1edc1dd923c7b06391
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be1b354649fb3285bf4c7460345de4e4f7e31e09e79dc4f81b3db4b722e5b743
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5cb804bbe8ecf9da1aebacca99061663f498db3976c71b97794155136a828264
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9Rsd8fT8XsJGL+mWxeQfmkqO2I0pNKr2BXN7oV5ko/abmT1F/39sLVmoxgMe/Ut0v/UwxcFwRh8uLBeS6LIsDA==
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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "appliesTo": "other: WebGL2 contexts on a page or in a worker",
  "article": "a-3d-shoe-showroom-in-raw-webgl2-line-lights-clear-acrylic-soft-shadows-and",
  "articleRevision": 1,
  "assumed": "asking for the extension again after the loss would give the same object.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "lose the context, then restore it: `webglcontextrestored` fires and the room draws again (in the worker and on the page's thread here, with the shoe still in focus).",
  "evidence": "commit 0481bb3, the lost-context check in the worker.",
  "fix": "keep the extension from before the loss.",
  "format": 2,
  "happened": "the restore never came, and the room stayed on its posters. I did not track down the cause in the spec; keeping the first object fixed it.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-92WJ",
  "packages": "",
  "product": "3d-shoe-showroom-webgl-react",
  "productRevision": 1,
  "publishedAt": "2026-11-05T22:01:48.965Z",
  "rule": "If a test loses a WebGL context with `WEBGL_lose_context` and the context never comes back, keep the extension object from before the loss and call `restoreContext()` on that one.",
  "site": "https://upfork.dev",
  "snippet": "```ts\nlet lose: WEBGL_lose_context | null = null;\nfunction loseForTest(gl: WebGL2RenderingContext) {\n  lose = gl.getExtension(\"WEBGL_lose_context\");\n  lose?.loseContext();\n}\nfunction restoreForTest() {\n  // before: gl.getExtension(\"WEBGL_lose_context\")?.restoreContext(), asked again after the loss\n  lose?.restoreContext();\n}\n```",
  "title": "WEBGL_lose_context: keep the extension object you lost the context with, and restore through it",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-92WJ",
  "version": 1,
  "why": ""
}