At skyQuality >= 1 the dome and cloud materials were rewritten every frame
only because `fx.y` carried the sky clock, so each frame re-prepared both
material bind groups. The clock now lives in `SkyClockBuffer`, a 16-byte
STORAGE | COPY_DST buffer created beside the shared light buffer
(AssetSet::Open) and bound read-only by both materials (sky binding 101,
cloud binding 103), the same shape as the materials' shared `light_buf`.
The render world writes `SkyClock::secs` into it in PrepareResources each
frame. `fx.y` is now reserved (0), so `write_gated` only touches a material
when a real input moves. The clock is still our own f64 accumulator with
the seamless 86400 s wrap (Bevy's globals.time wraps hourly); capture mode
still freezes it. A headless build with no RenderDevice gets no buffer and
spawns no sky or cloud dome.
Verified: cargo check -p benilla; cargo test -p benilla-world --lib (643
passed, 8 ignored); sky.wgsl (Classic and SKY_FX) and cloud.wgsl (plain and
SKY_FX_CLOUDS + VERTEX_COLORS) compose and validate under naga_oil 0.20 /
naga 27 offline against stubbed bevy_pbr imports and the real fog_hook,
monkey_frame and sky_fx modules. No GPU or WoW data here; built on Linux only.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Y6yUWgPosSakvL23gtgvpH
Claude
1f094e7880