The radial blur read the scene depth 28 times per full-resolution pixel. A
new mask pre-pass (`fs_mask`, R8Unorm at ceil(w/2) x ceil(h/2)) loads the
depth once per half-res texel and thresholds it with the same sky test
(depth <= 1e-7 on infinite reverse-Z); the blur then takes 28 clamp-to-edge
bilinear taps of the mask. Only the mask stage is MSAA-specialised (single
and multisampled depth layouts, one pipeline each); the blur pipeline is
keyed by the target format alone.
Verified: cargo check -p benilla; all four WGSL variants (blur, blur +
MULTISAMPLED, SHAFT_MASK, SHAFT_MASK + MULTISAMPLED) compose and validate
under naga_oil 0.20 / naga 27 offline. No GPU or WoW data in this
environment, so the image is not captured; built on Linux only.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Y6yUWgPosSakvL23gtgvpH
Claude
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