Loading the Intel Vulkan driver on Windows (igvk64.dll) crashes the process
with STATUS_ACCESS_VIOLATION (#4). The app leaves Vulkan out on Intel, but
the tests use wgpu's defaults, so on such a machine `cargo test` dies in the
first GPU test (ui-egui's background_redraw, adjust_preview_gpu, ...).
WGPU_BACKEND=dx12 avoids it for the kittest harnesses, but seven tests and
four benches built their instance with wgpu::Instance::default(), which takes
every backend and ignores the environment. They now use
InstanceDescriptor::new_without_display_handle_from_env(): the same defaults
with WGPU_BACKEND and friends applied, so nothing changes where it is unset.
Document the workaround in docs/development.md and the testkit driver notes.
* perf(gpu): reuse unchanged lower-stack composite chunks
* test(gpu): verify half-float composite checkpoint reuse
* docs: record measured GPU composite reuse gains and limits
* perf(gpu): admit whole grid chunks, serve partial damage as sub-rect copies
Cache entries were keyed by the exact damage rectangle, so brush strokes
(a new partial rect every frame) filled the budget with entries that
never hit again. Entries are now whole chunk-aligned, chunk-sized grid
cells: a capture merges into the cell it overlaps at the rectangle's
offset, a read is served as a sub-rect copy of the covered part, and
coverage is tracked per cell so a resume only happens where every pixel
of the requested rectangle is cached. After a full render, any in-bounds
partial rectangle hits.
Regression test: two series of disjoint strokes inside the same chunks
leave composite_cache_bytes unchanged (no entry-per-rectangle growth),
a full refresh still finds its chunks and a top-layer edit afterwards
reuses them. The old partial-damage test now expects the covered-chunk
hit and checks outside-the-document renders admit nothing.
* docs: record the GPU reuse measurement in target-app-parity.md
The honest assessment moved from roadmap.md to target-app-parity.md on
main; keep main's roadmap and add only the dated measurement.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---------
Co-authored-by: Brandon Thomas <echelon@gmail.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Kushagra Sharma