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New `--demo` mode for a real-seat perf load test (the Phase-0 perf measurement):
- Four windows, one per screen corner, angled INWARD (perspective + per-corner
rotateX/rotateY) — a curated layout, distinct from --run's single centered
window.
- Clients: 3x foot + 1x vivaldi (Chromium on Wayland via
--ozone-platform=wayland; probes vivaldi-stable/vivaldi/vivaldi-snapshot,
loud warning if absent). Replaces firefox, which rendered as an empty/clear
box on this compositor. Each client claimed into the next free corner slot at
map time (browser steered to its designated corner via app_id match;
vivaldi/chromium/firefox all recognized); per-slot bookkeeping freed on
unmap/destroy.
- Live FPS HUD (RmlUi text) in the corner; per-5s min/max FPS written to
$UNBOX_SPIKE_FPS_LOG (default $HOME/rml-spike-fps.log), fflush+fsync per line.
- Demo dead-man defaults to 120s (P resets; Esc/Ctrl+Alt+Backspace quit) so an
HD video can play while watching FPS.
All existing behavior intact (live-update loop, input routing through the
transform, cursor, escape hatch, persistent log). --verify ALL PASS, kernel
suite green, spike builds clean (build_by_default:false, out of the shipped
binary). Headless smoke: 3 foot + vivaldi map into 4 distinct corners; 5s
min/max FPS lines written.
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Iterated the Phase-0 spike from "self-verified headless" to "works on the
CF-AX3": a live, 3D-tilted client window you can type into, with a visible
cursor and pointer/touch routed through the transform. Real-seat confirmed.
Safety / escape (a black-screen lockout had forced reboots):
- session escape hatch on --run (mirrors src/input.cpp): Esc + Ctrl+Alt+Backspace
quit, Ctrl+Alt+F1..F12 VT-switch, SIGINT/SIGTERM clean-terminate.
- 15s DEAD-MAN auto-exit, reset by pressing P (also a keyboard-liveness probe);
UNBOX_SPIKE_TIMEOUT overrides. Guarantees the spike can never lock the machine.
- persistent crash-survivable log at $HOME/rml-spike.log (UNBOX_SPIKE_LOG),
fflush+fsync per line (was on tmpfs /tmp -> lost on reboot); loud diagnostics
for backend/modeset/client-connect/map/import.
Black screen / no window fixes:
- present path works on real DRM+gles2 (blue bg + marker confirmed on panel);
dark-blue clear + marker rect make "empty vs not-presenting" diagnosable.
- xdg wired from new_toplevel/new_popup (was new_surface -> no role -> no
configure -> client never mapped); foot now maps as a live surface element.
- WAYLAND_DISPLAY exported so spawned clients connect.
Interactivity:
- keyboard focus enter + key forward to the focused client (was never sent
without a pre-existing keyboard device); typing reaches foot.
- visible wlr-plane cursor (xcursor theme load + set; never drawn into RmlUi).
- pointer + touch hit-tested via RmlUi pick through the 3D transform, mapped to
surface-local, forwarded via wl_seat (criterion-3 pointer confirmed at edges).
Live update loop (was frozen on frame #1):
- send wlr_surface_send_frame_done to all mapped surfaces+subsurfaces each frame
(client lives as an imported texture, not a wlr_scene node).
- re-import the surface's CURRENT buffer per commit, gated on the surface commit
SEQUENCE not the buffer pointer (foot recycles a buffer pool -> same pointer,
new contents); double-buffered wlr_buffer lock/release so the client is never
starved. reimports now track commits ~1:1 (was capped 3:1).
--verify ALL PASS (criteria 1-7), kernel suite green, build + build-asan clean.
Spike target stays build_by_default:false, out of the shipped binary.
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Throwaway, self-contained spike target `packages/kernel/rml-compositing-spike`
(build_by_default:false, not in kernel_dep) proving RMLUi can composite live
client windows. `--verify` reads back the framebuffer headlessly and asserts all
7 criteria; `--run` brings up a real/nested-seat compositor for the user's
real-seat run. All 7 = ALL PASS on this dev box (an Intel Haswell-ULT iGPU on
Mesa crocus — the CF-AX3's GPU class):
1 zero-copy live dmabuf→EGLImage→GL texture sampled by RmlUi, cached (0 reimport
when buffer unchanged); 2 RCSS perspective+rotateY on the live pixels (verified
by readback); 3 screen→surface-local inversion through the 3D transform,
round-trip 0.000000 px (pure core doctested in the kernel suite); 4 surface
tree (toplevel+subsurface+popup) composited correctly → recommend
PER-SUBSURFACE elements (RTT escape-hatch for tree-spanning effects in Phase 1);
5 wallpaper (layer surface) via the identical import path; 6 idle dirty-gate =
0 renders over 120 idle turns, exactly 1 render per commit; 7 present path
FBO→dmabuf swapchain→wlr_scene_buffer with an EGL fence (no glFinish).
Crocus gotchas documented (linear modifiers, AR24 swizzle, cross-context fence,
FBO Y-flip, re-import only on new buffer). Real-seat GO/NO-GO (3D/touch feel,
frame-time @4 windows+video, idle power) is the user's call — runbook in
reports/rml-compositing-spike.md §5.
Also: GLOSSARY rows for "RML compositing" + "surface element" (user-confirmed);
tasks.md slice 13 updated to spike-complete/GO pending real-seat.
kernel suite green; full build clean; spike --verify ALL PASS.
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