static s16 sfxShotClock;
static u16 sfxShotFreq;

void sfxPlayerShot(){
	sfxShotClock = 4;
	sfxShotFreq = 150;
	PSG_setEnvelope(2, 2);
	PSG_setFrequency(2, sfxShotFreq);
}

static s16 sfxEnemyShotClock;
static u16 sfxEnemyShotFreq;
static u8 sfxEnemyShotType;

// high sharp zap - quick descending chirp
void sfxEnemyShotA(){
	sfxEnemyShotClock = 3;
	sfxEnemyShotFreq = 1200;
	sfxEnemyShotType = 0;
	PSG_setEnvelope(1, 3);
	PSG_setFrequency(1, sfxEnemyShotFreq);
}

// mid buzzy pulse - sits in the midrange
void sfxEnemyShotB(){
	sfxEnemyShotClock = 5;
	sfxEnemyShotFreq = 400;
	sfxEnemyShotType = 1;
	PSG_setEnvelope(1, 3);
	PSG_setFrequency(1, sfxEnemyShotFreq);
}

// quick rising ping - sweeps upward
void sfxEnemyShotC(){
	sfxEnemyShotClock = 4;
	sfxEnemyShotFreq = 300;
	sfxEnemyShotType = 2;
	PSG_setEnvelope(1, 3);
	PSG_setFrequency(1, sfxEnemyShotFreq);
}

static s16 sfxExpClock;

void sfxExplosion(){
	sfxExpClock = 18;
	PSG_setNoise(PSG_NOISE_TYPE_WHITE, PSG_NOISE_FREQ_CLOCK2);
	PSG_setEnvelope(3, 0);
}

void updateSfx(){
	if(sfxExpClock > 0){
		sfxExpClock--;
		PSG_setEnvelope(3, (18 - sfxExpClock) * 15 / 18);
		if(sfxExpClock == 0){
			PSG_setEnvelope(3, 15);
		}
	}
	if(sfxEnemyShotClock > 0){
		sfxEnemyShotClock--;
		if(sfxEnemyShotType == 0) sfxEnemyShotFreq -= 300;
		else if(sfxEnemyShotType == 1) sfxEnemyShotFreq -= 50;
		else sfxEnemyShotFreq += 150;
		PSG_setFrequency(1, sfxEnemyShotFreq);
		PSG_setEnvelope(1, 3 + (sfxEnemyShotType == 0 ? (3 - sfxEnemyShotClock) * 4 :
			sfxEnemyShotType == 1 ? (5 - sfxEnemyShotClock) * 2 :
			(4 - sfxEnemyShotClock) * 3));
		if(sfxEnemyShotClock == 0){
			PSG_setEnvelope(1, 15);
		}
	}
	if(sfxShotClock > 0){
		sfxShotClock--;
		sfxShotFreq -= 30;
		PSG_setFrequency(2, sfxShotFreq);
		PSG_setEnvelope(2, 2 + (4 - sfxShotClock) * 3);
		if(sfxShotClock == 0){
			PSG_setEnvelope(2, 15);
		}
	}
}