Opus voice chat (port/third_party/opus 1.5.2, port/linux/src/voice_audio.c, port/linux/game/network_voice.c), relayed by the host, in the lobby too. The host decides in Server Setup > Teamplay Options: lobby voice (on by default), the game's mode (off, team near, anyone near, team, team and enemies near: the default), the near distance, and the quality, 8 to 64 kbps (24). Each player picks push to talk (V), open mic or off, the voices' volume, and the output and input devices in Settings > Audio, and mutes others from the scoreboard's menu. A speaker icon marks who talks in the lobby, on the scoreboard and in a list in game. The host takes a machine's frames only with the key it gave it over its stream, within the quality's size, 50 a second and 8 talkers at once, and sends voices only to machines that asked for them, so the network version stays.
SteamOS keeps kernel tracing on for its GPU performance captures
(gpu-trace.service), and its Mesa, built with gpuvis, then writes a marker
into the trace buffer for each traced driver function. On the Steam Frame
that is some 480,000 writes a second: the driver's thread spent its time in
them, and the game ran at about 50 frames a second instead of the headset's
72 (#71 has the same for the arm64 build). The Steam Deck runs the same
gpu-trace service and the same Mesa, so it needs this too.
The executable now defines open() and openat() (and their 64-bit names),
exported so that the driver's calls reach them: they refuse trace_marker
and pass everything else on. gpuvis then skips its markers.
HALO_GPU_TRACE_MARKERS=1 lets the driver write them, to capture with gpuvis.
The link takes libdl for dlsym, which glibc before 2.34 keeps there.
Hosting a co-op level from the Map screen (CO-OP CAMPAIGN, a level and its
difficulty, then Server Setup) makes a network game on the campaign map
with no game engine, which is what co-op is. Only the host runs the
scripts and the AI; port/linux/game/network_coop.c sends clients what the
scripts do (cutscenes, camera, fades, HUD, sounds, devices, named objects,
animations), and network_actors.c drives the host's AI units on every
machine. Players spawn beside each other, respawn beside a safe teammate,
and spectate while dead or waiting. Skipping a cutscene is a vote.
Players can join a game in progress at any time.
MrBruh