// audio.c

int audio_frame(Ampler_state *state) {
	int queued = SDL_GetQueuedAudioSize(state -> playdev);
	queued /= sizeof s16; // queued is in bytes

	if(queued > FRAME_SAMPLES * CHANNELS * 2) return 0;
	// else puts("queued audio.");

	s16 silence[FRAME_SAMPLES * CHANNELS] = { 0 };
	for (int i = 0; i < FRAME_SAMPLES; i += CHANNELS) {
		int vol = 10;
		silence[i] = (i/2) * vol - FRAME_SAMPLES / 2;
		silence[i + 1] = (i/2) * vol - FRAME_SAMPLES / 2;
	}
	if(SDL_QueueAudio(state -> playdev, silence, sizeof silence))
		puts(SDL_GetError());

	return 1; // audio was qued
}