v0.5.1 - 2026-09-22

Release Notes

The bridge out of the Wine prefix is its own project now —
wineshm, MIT — and it stopped letting a
session that has ended read as the one you are in.

Fixed

• The pages outlived the game. A game exits; the section it was writing
  into stays, because the bridge is holding it; and the file under /dev/shm
  goes on holding the last frame for ever. A reader opening it found a car at
  some speed on some circuit — real numbers, from a session that ended — and
  starting the game again read that old frame until the first new one landed.
  This is the Huracán at Spa, at its source. The bridge is told which block
  changes while the game is alive (acpmf_physics, three hundred times a
  second) and zeroes every block when it goes quiet. Zeroes are the state
  every reader already waits through.
• A bridge that was killed no longer reads as a working one. It leaves its
  note and its pages exactly as they were, so the launcher card and the
  diagnostics said the bridge was fine while the pages beside it held a dead
  session. A running bridge touches its note every couple of seconds now, and
  BridgeStatus::Abandoned is what an untouched one reads as — not workable,
  and it says the pages are not a live session rather than quoting a version
  at somebody about a process that is gone.
• "Unreadable" now says what to do about it. A note this build cannot use —
  another release, or another program's blocks in the same directory — printed
  the fault and stopped, which is a support question rather than a diagnosis.

Changed

• shm-bridge/ is gone from this repository. It was a fork of
  poljar/shm-bridge carrying two other people's copyright, with its page list
  written into a const array so it served one pair of games and nothing else.
  Everything published up to and including v0.5.0 shipped it and is unaffected;
  LICENSING.md has the detail.
• The bridge is versioned separately. They moved together while it was a
  crate in this workspace, so "is the bridge current" meant "does it say what I
  say". A bridge reading 0.3.0 beside this application is a matched pair.
• Nothing has to be installed to start it: Steam ships the Proton the game is
  set to use and records which one in the prefix it built, so protontricks is
  a fallback rather than a requirement. That covers the native, Flatpak, Snap
  and Steam Deck layouts, and libraries on other disks.

Also in this release

Five faults found in one session and reported in one issue, fixed before
this one was cut.

Fixed

• One wrong stride in the packing key, and most cars lost their own tyre
  pressures. v0.4.6 said every car's own PRESSURE_IDEAL was read out of
  data.acd for the cars that ship it packed; for 72 of the 83 packed cars on
  the machine this was found on, it never was. The fifth of the key's eight
  components walked the folder name in strides of five where the game strides
  by four, and one wrong byte decrypts the whole file to noise — which is
  discarded here on purpose, so the failure was silent and looked exactly like
  a car that ships no figure. The class table answered instead, and a 90s
  Miata that wants 34 psi on both axles was told to deflate to 27.2. The true
  keys were solved for out of 83 real archives rather than read out of the
  code, and the test carries five of them.
• The engineer said the car understeers and oversteers at once. Two
  counters with a threshold each, and a lap understeers into one corner and
  oversteers out of another — so the panel carried "More Front Wing" directly
  above "More Rear Wing". There is one balance finding now: the larger count
  wins, and how much larger it is becomes the confidence, so a car that only
  ever understeers reads exactly as it did and a car that does both in equal
  measure says so by being unsure.
• And it named parts the car has not got. A car tagged street is
  deliberately Unknown rather than pressed into a class, and Unknown was on
  the side that has a wing — so a car whose whole setup screen is pressures,
  camber, toe, gears and fuel was told to add front wing and stiffen a bar it
  does not have. games::catalogue::Adjustables reads the car's own
  setup.ini, which is the file the game builds that screen from, and the
  guess is now only the fallback for Competizione and for a car whose data
  cannot be read.
• The panel's tread read inner-first on both sides of the car. The three
  numbers under each corner carry no labels, so their order is the only thing
  saying which edge is which — and on the left of the car the row ran the
  opposite way round to the tyre. The left-hand tyres read outer, middle,
  inner now. The numbers and the spread behind their colour are unchanged.
• "no finished laps yet" was two different nothings. A debrief is built
  from a lap watched from green flag to line, so a driver who starts the
  program after setting a time has laps on the game's counter and none here.
  The panel said the same sentence for that as for a session where nobody has
  finished anything, which reads as a fault when there is a lap time beside
  it. They are told apart now, from the lap count already in the frame.

Added

• Force feedback advice can be switched off. Assetto Corsa computes the
  signal whether or not anything is plugged in to feel it, and nothing in
  shared memory says what the driver is holding — so a driver on a pad was
  told to lower a gain they have not got, every lap. Settings -> RACE ENGINEER
  -> Force Feedback Advice, on by default.

Thanks

• @1sad again, who drove a 90s Miata and wrote
  down every one of these. The tyre faults in v0.4.6 and v0.4.8 were his as
  well; this is the third release in a row where the most useful bug report
  came from him.

Thanks

• @Stuntman Daz, who could not get any of this
  working on Bazzite and said so in detail. Every Linux fix in this release
  started from that thread: the setting that does not exist, the README that
  said the bridge was optional, and protontricks arriving as a Flatpak whose
  own /dev/shm makes a bridge publish where nothing can read it.

Install ac_tui 0.5.1

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/Rgosh/ac-pro-engineer/releases/download/v0.5.1/ac_tui-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://github.com/Rgosh/ac-pro-engineer/releases/download/v0.5.1/ac_tui-installer.ps1 | iex"

Download ac_tui 0.5.1

File	Platform	Checksum
ac_tui-x86_64-pc-windows-gnu.zip	x64 MinGW	checksum
ac_tui-x86_64-unknown-linux-gnu.tar.gz	x64 Linux	checksum