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Merged
abgnydn merged 1 commit into from
Aug 3, 2026
Merged

Ask for a GPU adapter before downloading 314 MB, not after #8

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14 changes: 11 additions & 3 deletions src/main.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -157,10 +157,18 @@ async function main() {
// Bail before the ~300 MB of binaries, not after: a Safari/Firefox
// visitor used to sit through the whole connectome download only to be
// told their browser can't run it.
if (!("gpu" in navigator)) {
log("navigator.gpu missing — needs Chrome, Edge, or Safari 26+", "err");
// Ask for the adapter, don't just check that navigator.gpu exists: a
// blocklisted GPU or a VM without passthrough exposes navigator.gpu and
// then hands back a null adapter, so an existence check lets that visitor
// download everything before failing on requestAdapter.
const gpuOk = await (async () => {
try { return !!(navigator.gpu && await navigator.gpu.requestAdapter()); }
catch { return false; }
})();
if (!gpuOk) {
log("no usable WebGPU adapter — needs Chrome, Edge, or Safari 26+", "err");
bootFail(
"WebGPU unavailable in this browser — the simulator needs Chrome, Edge, or Safari 26+ (Firefox: Windows only, 141+).",
"WebGPU unavailable here — the simulator needs Chrome, Edge, or Safari 26+ (Firefox: Windows only, 141+). If you are on one of those, your GPU may be blocklisted or unavailable to the browser.",
// Relative, not root-absolute: the site may be served under a
// subpath (Hugging Face Space), where "/index.html" 404s.
{ href: "index.html", text: "→ read what this project is (no WebGPU needed)" },
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