Debug options & screenshots

The game runs on gasm; debug options are launch parameters (gasm-run --param name=value, or URL query parameters on the play page):

Parameter	Effect
demo=<mode>	Scripted input for unattended runs: 1 (drive), fire, jeep, msv, heli, turret, drone, sub, rules, win; two-player: 2p, 2pheli, 2pwin, 2pspectate (with play2=1)
sfx_log=1	Log sound-effect instances and voices
cam_h=<n>	Driving camera height (0 = 1.0× zoom)
p1=<name>, p2=<name>	Player names for the high scores

gasm-run's own options do the rest: --headless N runs N frames without a window or sound and prints hashes of the video and audio, --screenshot <png> saves the last frame, --mute silences a windowed run, --input scripts pads and keys (Running on gasm). The clock is 16 ms per frame, so runs are reproducible: frame N shows the game at 16 × (N − 1) ms.

Example — the screenshot of a tank firing used on this site (11000 ms = frame 689):

gasm-run build-gasm/openrf.wasm --asset-dir cd --headless 689 --screenshot shot.png \
  --param skip_intro=1 --param play=1 --param demo=fire

tools/screenshots.sh regenerates every screenshot in docs/public/screenshots/ that way, with the released gasm-run (data from ./cd, or OPENRF_DATA=<folder or image>).

The native build (tests only) reads:

Variable	Effect
OPENRF_DATA=<folder or image>	Data for the tests and render_test (default ./cd)
OPENRF_HS=<file>	High-score file of rules_test / twoplayer_test (default ~/Library/Application Support/Return Fire/RFire_HS)