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vangel76andClaude Opus 5.5
da99015b11
Enumerating Vulkan adapters crashes inside Intel's igvk64.dll on some UHD Graphics drivers, before any Rust error handling runs. Since #22 the Windows instance is DirectX 12 only; this keeps Vulkan out of every default path and adds two fallbacks so DX12-only can't leave a PC without a window: - A DirectX 12 probe before eframe starts: no hardware adapter that meets eframe's limits -> OpenGL (plus DX12/WARP as last resort when WARP is all DX12 offers). - If run_native fails with a wgpu error before the app was created, start once more with the other of DX12/GL (eframe reuses its event loop). WGPU_BACKEND still overrides everything, and nothing else is tried then. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2.6 KiB
2.6 KiB
Hardware parity
Last reviewed: 2026-10-10 · Last updated: 2026-10-11 · Change: trivial (Windows renderer fallback, #120) · Target: Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4
The hardware Excel uses, per platform, against GridCraft. Part of target-app-parity.md. Hardware: ~40% ready, 25–40 h (estimated).
| Hardware feature | Excel | GridCraft (macOS · Windows · Linux · BSD · web) | Gap and estimate |
|---|---|---|---|
| Multi-core recalculation | Multi-threaded recalculation on all cores (Windows and Mac), configurable thread count | Single-threaded everywhere (no threading in crates/calc) |
Parallel recalc of independent dependency chains on native builds; WASM stays single-threaded or uses workers later: 12–18 h |
| GPU rendering of the grid and charts | DirectX / Metal accelerated drawing | wgpu: Metal · DirectX 12 (default since 10-08; OpenGL when DirectX 12 has no GPU driver or fails to start; Vulkan only on request, so the Intel UHD igvk64.dll crash (#120) can't happen) · Vulkan/GL · Vulkan/GL · WebGPU or WebGL2 |
At parity in kind. Driver problems: screen flashing on Windows 11 (#76): 2–4 h |
| Pen and touch (Draw tab) | Pen pressure and tilt, eraser end, touch mode, Ink to Shape, ink replay | Pen, highlighter, eraser, Ink to Shape with mouse/pen input; no pressure or tilt, no touch mode | Pressure-sensitive strokes where winit reports force; touch-friendly ribbon spacing: 4–6 h |
| Trackpad and mouse | Smooth scrolling, pinch zoom, horizontal scroll, Magic Mouse | Smooth scrolling and zoom via egui | Verify pinch zoom on each platform: 1–2 h |
| Multiple windows and monitors | One window per workbook, New Window for the same workbook, per-monitor DPI | One window; multiple workbooks switch inside it (#162; PR #171) | Native window per workbook, New Window, Arrange All across monitors: 6–8 h |
| High-DPI and display scaling | yes | yes (display scale matched to desktop density) | — |
| Accessibility hardware (screen readers, braille displays, switch control) | Narrator, JAWS, NVDA, VoiceOver | AccessKit enabled in eframe; grid cells and ribbon not yet exposed as an accessible tree | Counted under UI (ui-parity.md) |
| Printers | System print with driver options | Desktop prints through the system dialog via PDF; web exports only | Counted under print |
Revision history
| Date | Change | Summary |
|---|---|---|
| 2026-10-11 | trivial | Windows: OpenGL fallback when DirectX 12 has no GPU or fails to start; Vulkan never by default (#120) |
| 2026-10-10 | major | Created: single-threaded calc, wgpu rendering, no pen pressure, single window |