new version
[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 = (((i1&0x1f)<<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 #define tmp acc
43 MOV (tmp, i1)
44 SWAP (tmp)
45 ANDI (tmp, 0x0f)
46 LSR (tmp)
47 LSR (tmp)
48 OR (n, tmp)
49 #undef tmp
50 MOV (s, i3)
51 ROR (s)
52 ROR (s)
53 ANDI (s, 0x80)
54 #define tmp acc
55 MOV (tmp, i2)
56 LSR (tmp)
57 OR (s, tmp)
58 #undef tmp
59
60 //voice 1:
61 LDI (x, 1)
62 MOV (t, n)
63 LDI (o, 12)
64 RCALL g();
65 MOV (acc, t)
66
67 //voice 2:
68 MOV (x, s)
69 #define tmp o
70 MOV (tmp, i2)
71 LSL (tmp)
72 LSL (tmp)
73 LSL (tmp)
74 MOV (t, i1)
75 SWAP (t)
76 ANDI (t, 0xf)
77 LSR (t)
78 OR (t, tmp)
79 #undef tmp
80 EOR (t, n)
81 LDI (o, 10)
82 RCALL g();
83 ADD (acc, t)
84
85 //voice 3:
86 MOV (x, s)
87 INC (x)
88 x = (x*0x55)>>8;
89 t = n + (((i3&0x01)<<13 | i2<<5 | i1>>3) % 3);
90 LDI (o, 10)
91 RCALL g();
92 ADD (acc, t)
93
94 //voice 4:
95 x = s / 5;
96 t = 8 + n - (((i3&0x01)<<14 | i2<<6 | i1>>2) % 3);
97 LDI (o, 9)
98 RCALL g();
99 ADD (acc, t)
100
101 putchar(acc<<4);
102 #define tmp acc
103 LDI (tmp, 0)
104 SUBI (i0, -1)
105 ADC (i1, tmp, !i0)
106 ADC (i2, tmp, !i0&&!i1)
107 ADC (i3, tmp, !i0&&!i1&&!i2)
108 #undef tmp
109 }
110 }
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