Running on gasm

OpenGTA is a gasm game: opengta.wasm runs on gasm's native runner gasm-run, version 0.6.0 or newer.

Get the runner and the module

• gasm-run: download it for your platform from the gasm releases (macOS universal, Linux x86-64 and arm64, Windows x86-64). From a checkout, tools/fetch-gasm-runner.sh macos-universal fetches the pinned version into .deps/.
• opengta.wasm: from a release (opengta-<version>.wasm, or a ready-to-run gasm bundle: see Installing), build it from source, or take the module the browser player runs, opengta.wasm, built from main by the site's workflow. It is the engine only: no game data.

Run it

Point --asset-dir at your GTA, either form (Game data):

# the installed game (the folder with GTADATA and WINO)
gasm-run opengta.wasm --asset-dir "/path/to/GTA"

# the unzipped GTAINSTALLER.zip (the folder with data1.cab and data2.cab)
gasm-run opengta.wasm --asset-dir "/path/to/GTAINSTALLER"

The game opens at the start menu in a 960 x 720 window, scaled up from the original's 640 x 480. Useful gasm-run options:

Option	What
--param name=value	a launch parameter, e.g. --param mission=1
--window 1280x960	another window size
--filter nearest	plain pixel doubling instead of the default sharp scaling (also xbr, fsr, crt)
--integer-scale	whole multiples only
--storage-dir saves	keep the saves (player names, scores, options) in a folder of your choice
--mute	no sound

Holding Esc for a second quits gasm-run; a tap goes to the game. See Controls.

Headless

gasm-run also runs the game without a window, as fast as it can, and prints hashes of every frame and of the sound, which is how OpenGTA checks that the native and the browser runners agree. See Headless runs and hash checks.