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Fix #2786: the web build uses WebAssembly SIMD, so the canvas renders about 2.5x faster

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Without simd128, vello_cpu's SIMD layer (fearless_simd) runs its scalar fallback on wasm32.
`.cargo/config.toml` now sets `-C target-feature=+simd128` for wasm32-unknown-unknown, which
trunk (packaging/web/package.sh) and `cargo xtask wasm` both pick up.

A full-frame canvas render of the issue's test drawing in headless Chrome 156 drops from 7.8 to
3.2 ms at 1400 x 900 and from 8.2 to 3.2 ms at 1920 x 1080 (median of 7 and 6 alternating runs on
a loaded machine). The canvas pixels are identical.

The web build now needs Chrome/Edge 91+, Firefox 89+ or Safari 16.4+; older browsers can no
longer load it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
vangel76
2026-11-03 00:26:21 +01:00
co-authored by Claude Opus 5.5
parent 4ee0ef231a
commit f3df8f34d2
1 changed files with 7 additions and 0 deletions
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.cargo/config.toml
+7
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@@ -1,2 +1,9 @@
[alias]
xtask = "run --package xtask --"
# WebAssembly SIMD for the web build: without it vello_cpu's SIMD layer (fearless_simd) runs its
# scalar fallback on wasm32 and the canvas renders about 2.4x slower (#2786). The web build then
# needs Chrome/Edge 91+, Firefox 89+ or Safari 16.4+. A RUSTFLAGS environment variable replaces
# these flags.
[target.wasm32-unknown-unknown]
rustflags = ["-C", "target-feature=+simd128"]