// Optional background audio. All API calls belong on the game/main thread.
int OK = 0;
int ERROR = -1;
int BOOP = 1;
int WIN = 2;
int LOSE = 3;
int RATE = 48000;
{ i32 } simple_audio_open = "C";
{ i64 u32 -> i32 } simple_audio_load = "C";
{ i32 -> i32 } simple_audio_play = "C";
{ i32 } simple_audio_stop = "C";
{ i32 } simple_audio_playing = "C";
{ i32 } simple_audio_close = "C";
// Missing/disabled backend returns ERROR quietly; the game may remain silent.
val open = { -> simple_audio_open(); };
// Mono signed 16-bit PCM at RATE, up to ten seconds. Copies into native memory.
// Load at startup: up to 28 custom handles, valid until close, then reload.
val load = { i16[~] samples ->
    i64 ptr = samples;
    simple_audio_load(ptr,samples#);
};
// Starts/restarts immediately, replacing the previous sound; never waits for it.
val play = { int sound -> simple_audio_play(sound); };
val boop = { -> simple_audio_play(BOOP); };
val win = { -> simple_audio_play(WIN); };
val lose = { -> simple_audio_play(LOSE); };
val stop = { -> simple_audio_stop(); };
val playing = { -> simple_audio_playing(); };
val close = { -> simple_audio_close(); };