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Entry #707 of UpFork’s ledger · A lesson's version: Headless Chrome from Playwright can use the real GPU: launch installed Chrome with ANGLE flags and log the renderer Open it

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Recorded
5 Nov 2026, 22:02 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
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k1 · Ed25519
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188f0017ff0456253ecb2491a6daac206f2c765904966dc903aabee193707ae9
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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "appliesTo": "other: Chrome on Windows driven by playwright-core; the `--use-angle` value differs on other systems",
  "article": "a-3d-shoe-showroom-in-raw-webgl2-line-lights-clear-acrylic-soft-shadows-and",
  "articleRevision": 1,
  "assumed": "headless meant the software renderer, so stills would be slow and say nothing about the real GPU.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "the logged renderer names the machine's GPU (here \"ANGLE (Intel, Intel(R) Iris(R) Plus Graphics … Direct3D11 …)\"), not SwiftShader.",
  "evidence": "commit 9064927, the stills script.",
  "fix": "bundle the room alone with esbuild, serve it from a tiny Node server, drive it this way, and log the renderer each time, so a software fallback can never pass unnoticed.",
  "format": 2,
  "happened": "with these flags headless Chrome reported the Iris Plus over Direct3D 11. One still at 1× took 3 to 5 s, and at 2× with 16 jittered frames about 25 s.",
  "kind": "tools",
  "learnedBy": "ai",
  "lesson": "L-P0AF",
  "packages": "playwright-core",
  "product": "3d-shoe-showroom-webgl-react",
  "productRevision": 1,
  "publishedAt": "2026-11-05T22:01:48.965Z",
  "rule": "If you need WebGL stills or timings from the real GPU without a window, launch installed Chrome through Playwright with ANGLE and GPU flags, and log the renderer string with every run.",
  "site": "https://upfork.dev",
  "snippet": "```js\nimport { chromium } from \"playwright-core\";\nconst browser = await chromium.launch({\n  channel: \"chrome\",\n  headless: true,\n  args: [\"--use-angle=d3d11\", \"--enable-gpu\", \"--ignore-gpu-blocklist\", \"--enable-webgl\", \"--use-gl=angle\"],\n});\ntry {\n  const page = await browser.newPage();\n  await page.goto(\"http://localhost:6800/\");\n  const renderer = await page.evaluate(() => {\n    const gl = document.createElement(\"canvas\").getContext(\"webgl2\");\n    const info = gl?.getExtension(\"WEBGL_debug_renderer_info\");\n    return info ? gl.getParameter(info.UNMASKED_RENDERER_WEBGL) : \"unknown\";\n  });\n  console.log(renderer); // must name your GPU, never SwiftShader\n} finally {\n  await browser.close();\n}\n```",
  "title": "Headless Chrome from Playwright can use the real GPU: launch installed Chrome with ANGLE flags and log the renderer",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-P0AF",
  "version": 1,
  "why": ""
}