X-Git-Url: https://git.gir.st/Chiptunes.git/blobdiff_plain/cb4533d4555df03a6ce977d120787ef3fda63f42..1b023e92b8e7cf629d3c94c33608d9c2eb7135a0:/foo.c

diff --git a/foo.c b/foo.c
index a0c6eb2..06ff396 100644
--- a/foo.c
+++ b/foo.c
@@ -2,28 +2,85 @@
 #include "fakeasm.h"
 typedef unsigned char u8;
 
-int g(int i, u8 x, u8 t, u8 o) {
-	u8 xxx = (3 & i >> 16 ? "BY}6YB6%" : "Qj}6jQ6%")[t % 8];
-	SUBI	(xxx, -51)
-	xxx = (i*xxx) >> o;
-	AND	(xxx, x)
-	ANDI	(xxx, 3)
-	return xxx;
+u8 data[] = {   
+	0x84, 0x9d, 0xb0, 0x69, 0x9d, 0x84, 0x69, 0x58,
+	0x75, 0x8c, 0xb0, 0x69, 0x8c, 0x75, 0x69, 0x58
+};
+u8 i0;
+u8 i1;
+u8 i2;
+u8 i3;
+u8 x;
+u8 t;
+u8 o;
+void g(void) {
+	// g(i, x, t, o) -> t
+	u8 tmp;
+	ANDI	(t, 0x07)
+	MOV	(tmp, i2)
+	ANDI	(tmp, 3)
+	TST	(tmp)
+	BREQ	(skip)
+	SUBI	(t, -8)
+	skip:
+	t = data[t];
+	t = ((i3<<24|i2<<16|i1<<8|i0)*t) >> o;
+	AND	(t, x)
+	ANDI	(t, 3)
+	RET
 };
 
 int main(void) {
-	int i;
-	int n;
-	int s;
+	u8 n;
+	u8 s;
 	u8 acc;
-	for (i = 0;; i++) {
+	//TODO: clear all vars/registers
+	for (;;) {
 		acc = 0;
-		n = i >> 14;
-		s = i >> 17;
-		acc += g(i, 1, n, 12);
-		acc += g(i, s, n ^ i >> 13, 10);
-		acc += g(i, s / 3, n + ((i >> 11) % 3), 10);
-		acc += g(i, s / 5, 8 + n - ((i >> 10) % 3), 9);
+		n = (i2<<2 | i1>>6);
+		s = (i3<<7 | i2>>1);
+
+		//voice 1:
+		LDI	(x, 1)
+		MOV	(t, n)
+		LDI	(o, 12)
+		RCALL	g();
+		MOV	(acc, t)
+
+		//voice 2:
+		MOV	(x, s)
+		#define tmp o
+		MOV	(o, i2)
+		LSL	(o)
+		LSL	(o)
+		LSL	(o)
+		#undef tmp
+		t = n ^ (o | i1>>5);
+		LDI	(o, 10)
+		RCALL	g();
+		ADD	(acc, t)
+
+		//voice 3:
+		x = s / 3;
+		t = n + ((i3<<13 | i2<<5 | i1>>3) % 3);
+		LDI	(o, 10)
+		RCALL	g();
+		ADD	(acc, t)
+
+		//voice 4:
+		x = s / 5;
+		t = 8 + n - ((i3<<14 | i2<<6 | i1>>2) % 3);
+		LDI	(o, 9)
+		RCALL	g();
+		ADD	(acc, t)
+
 		putchar(acc<<4);
+		#define tmp acc
+		LDI	(tmp, 0)
+		SUBI	(i0, -1)
+		ADC	(i1, tmp, !i0)
+		ADC	(i2, tmp, !i0&&!i1)
+		ADC	(i3, tmp, !i0&&!i1&&!i2)
+		#undef tmp
 	}
 }