Ludus smoke application

The native and browser executables share Application start/tick/shutdown and a small bounded simulation. Private drivers choose their rendering and scheduling. Native diagnostics startup, logging and profiling capture remain in main.cpp. Native Vulkan command recording is unchanged; rendering failures now stop the smoke loop and return a failure code instead of logging forever.

The web presets build out/build//apps/smoke/index.html, index.js and index.wasm. Serve over localhost or HTTPS; file:// is not the supported path. The browser driver polls async RHI and pipeline readiness from RAF callbacks. It never draws while loading. A failed/lost session releases sample GPU resources, shuts down RHI, then destroys the window/listeners. Restart resets the simulation and starts a fresh generation. Stop is idempotent.

Click the canvas, then use WASD/arrows to move the triangle. Click or drag to reposition it; input uses the Platform snapshot and CSS pointer coordinates. Each callback reads one timestamp and samples an application-owned FrameClock; visible animation and movement accept at most 100 ms of it, reporting the excess as discarded. Hidden canvases and Platform's queued input reset (hide or blur) drop the baseline, so a returning page never replays hidden time. Hidden canvases freeze simulation and skip rendering; held input clears through Platform. The triangle stays inside the canvas through a square viewport on any aspect/DPR. The renderer privately owns WGSL and pipeline resources through W5 sample interop; no new public RHI or installed SDK API is introduced.

The shell provides loading, missing-WebGPU, failure and device-loss messages, Restart/Stop and user-initiated fullscreen. Rendering diagnostics stay in the console. Fullscreen permission/availability errors appear separately so frame status updates cannot erase them. Status text changes only when its message changes, avoiding repeated live-region announcements.

The production index build is web-only and contains no controlled provider. A separate smoke-test.js/node target links the explicit test DOM/GPU provider and runs the same Application/renderer sources. CI publishes only index.* artifacts. Native Catch2 tests verify shared timing, hidden/blurred input and pointer mapping. Build a self-contained Release ZIP with ./scripts/package-web; see browser packaging for clean extraction and itch.io settings. Hardware acceptance remains tracked in the browser smoke evidence.