World sounds are local: fade with distance and pan (distant sizzles snapped constantly)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

test/play.py

@@ -26,6 +26,17 @@ with sync_playwright() as p:
     pg.wait_for_timeout(500)
     ev = pg.evaluate
     ev("window._maxStatus = ''; const _ss = setStatus; setStatus = function (s, k) { if (s && s.length > _maxStatus.length) _maxStatus = s; return _ss(s, k); }; 0")
+    # World effects use the view, and inaudible ones must not throttle nearby sounds.
+    ev("auInit(); window._noiseCalls = 0; window._noiseBurst = noiseBurst; noiseBurst = function (...args) { _noiseCalls++; return _noiseBurst(...args); }; 0")
+    try:
+        far = ev("(() => { const n = _noiseCalls; AU.last.sizzle = 0; const x = R.vx0 + R.bw * 3, y = R.vy0 + R.bh / 2; playSfx('sizzle', 0, x, y); return [_noiseCalls - n, sfxPlace(x, y).gain, AU.last.sizzle]; })()")
+        check('a sound far off-screen is silent', far == [0, 0, 0], far)
+        near = ev("(() => { const n = _noiseCalls; AU.last.sizzle = 0; const x = R.vx0 + R.bw / 2, y = R.vy0 + R.bh / 2; playSfx('sizzle', 0, x, y); return [_noiseCalls - n, sfxPlace(x, y).gain, AU.bus == null]; })()")
+        check('a sound on screen plays', near == [1, 1, True], near)
+        quiet = ev('sfxPlace(R.vx0 + R.bw * 1.5, R.vy0 + R.bh / 2)')
+        check('a sound just off-screen is quieter', 0 < quiet['gain'] < 1 and quiet['pan'] > 0, quiet)
+    finally:
+        ev('noiseBurst = _noiseBurst; delete window._noiseBurst; delete window._noiseCalls; 0')
     look = sys.argv[2] if len(sys.argv) > 2 else 'pixel'
     check('a new game starts fully zoomed in', ev('SET.zoom') == 12, ev('SET.zoom'))
     # Ctrl+W closes the tab; with a world open the browser must ask first