irisandClaude Sonnet
19c36e37f2
GpuTextures folded the masks and move_offsets storage buffers into every standalone image's own bind group (group 2), alongside that image's texture view. Since ArrBuf::update hands back a new Buffer identity whenever either buffer's length changes -- which a widget getting its first move-offset slot can trigger, unrelated to any image -- every live image's bind group had to be rebuilt whenever either buffer grew. Appending a 1,001st image to 1,000 already-settled ones cost 1,001 bind-group creates, not 1 (IRIS_TODO.md, run-bench.sh images). Moved both buffers into their own bind group (group 3 in shader.wgsl and UiRenderNode), bound once per frame in draw() rather than once per per-image bind group. GpuTextures's image bind groups now only reference the atlas array view, the image's own view and the sampler -- none of which change when masks/move_offsets resize -- so a resize touches exactly one bind group regardless of how many images are live. This also closes the "two frames to reach steady state" item, which was the same bug measured a second way. Verified: cargo build/clippy/test clean (19 tests), cargo ndk build/clippy clean, run-headless.sh tabs --shot byte-identical (27266 bytes). New run-bench.sh images numbers: cold load unchanged at 1000/0/0/0, append now 1 instead of 1001. Both Fix items in IRIS_TODO.md ticked with the before/after numbers. Co-Authored-By: Claude Sonnet <noreply@anthropic.com>