Poses and skater sound between a dedicated server and its players use new
formats. Lobbies and the links between games are unchanged.
Poses (pose_codec.h, pose_batch.h):
- A pose is rounded once (rotations to 0.08 degrees, positions to a
millimetre) and sent as its differences from a pose of the same player
the receiver has acknowledged. Several players' poses share one message.
- The receiver acknowledges messages once a tick; the sender builds only on
acknowledged poses, or on the whole pose it sent reliably. Loss costs the
poses in that packet and nothing more.
- Fingers are not sent to players further than "finger_distance" (25 m).
- Games upload their own poses the same way, and the server acknowledges.
- About 300 B a pose at full rate against about 660 B before.
- The server no longer rounds rotations by distance: it saved little.
Sound (sound_codec.h):
- Each sample is sent as what changed since the one before, numbers rounded
to 1/1024. One reliable message a tick carries every skater a player can
hear. A stream is sent whole at its start and every two seconds.
- About 106 B a message against 368 B before, on a recording of real play.
Direct connections:
- "connection": "relay" (default) or "direct", with "direct_address" and
"direct_port". A direct server listens on UDP and is listed with its
address; players still sign in through Steam.
- Games connect straight to servers that offer it and fall back to the
relays after 5 s. Setting and "mp direct-connections" to turn it off.
Server:
- "bone_scale_limit" is 1 by default: resized body parts are off unless a
server allows them.
- Logs Steam's relay network status at start-up and in "net", and watches
the Steam sign-in.
- "pack_ms" (10): how long Steam may hold a message to pack it with others.
- "steam_debug": logs what Steam's networking says, for connection faults.
- "relay_everything": sends poses and sound through the server even between
games that have linked, for testing with few players.
- "net" shows pose sizes by rate, the share sent without fingers, and whole
poses sent.
Game:
- Only ReSkate's nametags are shown; the game's own are removed.
- "mp pose-dump <seconds>" records the local skater's poses and sound.
Tests: pose_codec_tests covers exact round trips, chains of differences,
held fingers, damaged input, the sender and receiver over a link that
delays, loses and reorders, and the sound format; with a recording as its
argument it prints sizes on real play.
Protocol 44: servers and games must both update.
