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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 MOV (n, i2)
40 LSL (n)
41 LSL (n)
42 n = (n | i1>>6);
43 s = (i3<<7 | i2>>1);
44
45 //voice 1:
46 LDI (x, 1)
47 MOV (t, n)
48 LDI (o, 12)
49 RCALL g();
50 MOV (acc, t)
51
52 //voice 2:
53 MOV (x, s)
54 #define tmp o
55 MOV (tmp, i2)
56 LSL (tmp)
57 LSL (tmp)
58 LSL (tmp)
59 MOV (t, i1)
60 SWAP (t)
61 ANDI (t, 0xf)
62 LSR (t)
63 OR (t, tmp)
64 #undef tmp
65 EOR (t, n)
66 LDI (o, 10)
67 RCALL g();
68 ADD (acc, t)
69
70 //voice 3:
71 x = s / 3;
72 t = n + ((i3<<13 | i2<<5 | i1>>3) % 3);
73 LDI (o, 10)
74 RCALL g();
75 ADD (acc, t)
76
77 //voice 4:
78 x = s / 5;
79 t = 8 + n - ((i3<<14 | i2<<6 | i1>>2) % 3);
80 LDI (o, 9)
81 RCALL g();
82 ADD (acc, t)
83
84 putchar(acc<<4);
85 #define tmp acc
86 LDI (tmp, 0)
87 SUBI (i0, -1)
88 ADC (i1, tmp, !i0)
89 ADC (i2, tmp, !i0&&!i1)
90 ADC (i3, tmp, !i0&&!i1&&!i2)
91 #undef tmp
92 }
93 }
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