sfx, explozion

src/sfx.h

@@ -0,0 +1,80 @@
+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);
+		}
+	}
+}