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Recorded on 25 October 2026, unchanged since

Entry #10 of UpFork’s ledger · A lesson's version: On Windows, WebGL's ANGLE (Direct3D 11) unrolls loops with constant bounds: the first draw took 3.7 s Open it

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Recorded: 25 Oct 2026, 18:16 UTC
Signed with: k1 · Ed25519
Entry hash: 669035f345cd336988e319921da4137c72f4c4dc35ffa49d01c32ed51ad02a3e
Before it: 50595cd6265ad7fe6f1e89414c0a8c5a313e428e3a3937e42126759ae4062eea
Record hash: fc69fa3240cf12cfdad23e4192eb99af0734fc46efa768a5401801fabfa0948a
Signature: NqMi9x9F0e2jIxjwZQrczSmqj3eQJG4OVbk6yBW6FiozUahv3AbqN8civBvlH+PW1lUIH5oIiLfcR/u8GnzDBQ==

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{
  "ai": {
    "apps": [],
    "models": []
  },
  "article": "how-infall-ray-traces-a-black-hole-in-the-browser-and-what-we-learned",
  "articleRevision": 1,
  "assumed": "loops with constant bounds in a fragment shader (thread layers, star layers, disk crossings) cost nothing extra to compile.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "third milestone (00b192a): the first draw took 0.2 to 0.4 s after the change, on the same machine.",
  "fix": "loop counts come from `int` uniforms, so the compiler can't unroll them; at most three disk crossings (`MAX_CROSS 3`); and the shaders compile with three.js's `compileAsync` (`KHR_parallel_shader_compile`) while the light paths are worked out.",
  "happened": "in Chrome on Windows, where WebGL runs through ANGLE on Direct3D 11, the compiler unrolled them, copying each loop's body, and the first draw stalled for 3.7 s on an Intel Iris Plus.",
  "kind": "tools",
  "learnedBy": "ai",
  "lesson": "L-D2RE",
  "packages": "three@0.186",
  "product": "black-hole-hero",
  "productRevision": 3,
  "publishedAt": "2026-10-25T11:23:56.027Z",
  "site": "https://upfork.dev",
  "title": "On Windows, WebGL's ANGLE (Direct3D 11) unrolls loops with constant bounds: the first draw took 3.7 s",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-D2RE",
  "version": 1,
  "why": ""
}