https://gitlab.synchro.net/main/sbbs/-/commit/6f60a597729a11e814984075
Modified Files:
src/doors/syncdoom/syncdoom.c xtrn/syncdoom/controls.msg
Log Message:
syncdoom: frame de-dupe + overlay throughput + auto-depth retune

Follow-ups to the adaptive frame pacing (3f94d6c31), driven by live VPN/LAN testing and the exit telemetry now in the BBS log.

Frame de-dupe:
- emit_frame keeps a copy of the last framebuffer sent and skips a byte-identical
re-render -- the duplicates Doom emits between its 35fps sim tics, plus any still
scene. Caps the wire rate at the real visual rate and saves the redundant bytes
(logs show 50-75% of renders skipped). Cache is invalidated on any label flash or
geometry change so the screen never goes stale.
- The Ctrl-S overlay no longer suspends de-dupe (which defeated the point while you
watched the meter): the frame body is de-duped independently, and the overlay
refreshes only when its text changes, so a static screen costs ~nothing. This also
cures the overlay flicker (it was repainting row 1 every frame).

Stats overlay + telemetry:
- Overlay shows transmit throughput (KB/s to the player) and reads "depth N/auto";
dropped the "SyncDOOM" label for room. Exit telemetry logs the de-duped count.
- Ctrl-T's centered popup is suppressed while the overlay is up (it already shows
the live depth/RTT) so it can't obscure the game.

auto-depth retune (max_inflight):
- Floor depth at 2 once RTT > ~30ms: depth 1 is one frame per round-trip -- a
slideshow on a remote link -- so never auto-park a far player there.
- The BDP cap now only applies while actively streaming (recent fps >= 10). An idle
or de-duped lull drops the frame rate for lack of MOTION, not bandwidth; capping
on that was clamping depth to 1 right as the next move began (the logged
"depth=1 on a 211ms link" bug). The RTT-inflation backoff stays the real bloat
guard, and heavy queuing now drains all the way to 1 to flush a backlog.

controls.msg: add the Ctrl-S row + color/style refresh.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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