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[Chiptunes.git] / foo.c
1 #include <stdio.h>
2 #include "fakeasm.h"
3 typedef unsigned char u8;
4
5 u8 data[] = {
6 0x84, 0x9d, 0xb0, 0x69, 0x9d, 0x84, 0x69, 0x58,
7 0x75, 0x8c, 0xb0, 0x69, 0x8c, 0x75, 0x69, 0x58
8 };
9 u8 i0;
10 u8 i1;
11 u8 i2;
12 u8 i3;
13 u8 x;
14 u8 t;
15 u8 o;
16 void g(void) {
17 // g(i, x, t, o) -> t
18 u8 tmp;
19 ANDI (t, 0x07)
20 MOV (tmp, i2)
21 ANDI (tmp, 3)
22 TST (tmp)
23 BREQ (skip)
24 SUBI (t, -8)
25 skip:
26 t = data[t];
27 t = ((i3<<24|i2<<16|i1<<8|i0)*t) >> o;
28 AND (t, x)
29 ANDI (t, 3)
30 RET
31 };
32
33 int main(void) {
34 u8 n;
35 u8 s;
36 u8 acc;
37 //TODO: clear all vars/registers
38 for (;;) {
39 acc = 0;
40 n = (i2<<2 | i1>>6);
41 s = (i3<<7 | i2>>1);
42
43 //voice 1:
44 LDI (x, 1)
45 MOV (t, n)
46 LDI (o, 12)
47 RCALL g();
48 MOV (acc, t)
49
50 //voice 2:
51 MOV (x, s)
52 #define tmp o
53 MOV (tmp, i2)
54 LSL (tmp)
55 LSL (tmp)
56 LSL (tmp)
57 MOV (t, i1)
58 SWAP (t)
59 ANDI (t, 0xf)
60 LSR (t)
61 OR (t, tmp)
62 #undef tmp
63 EOR (t, n)
64 LDI (o, 10)
65 RCALL g();
66 ADD (acc, t)
67
68 //voice 3:
69 x = s / 3;
70 t = n + ((i3<<13 | i2<<5 | i1>>3) % 3);
71 LDI (o, 10)
72 RCALL g();
73 ADD (acc, t)
74
75 //voice 4:
76 x = s / 5;
77 t = 8 + n - ((i3<<14 | i2<<6 | i1>>2) % 3);
78 LDI (o, 9)
79 RCALL g();
80 ADD (acc, t)
81
82 putchar(acc<<4);
83 #define tmp acc
84 LDI (tmp, 0)
85 SUBI (i0, -1)
86 ADC (i1, tmp, !i0)
87 ADC (i2, tmp, !i0&&!i1)
88 ADC (i3, tmp, !i0&&!i1&&!i2)
89 #undef tmp
90 }
91 }
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