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 #define tmp o
89 x = (x*0x55)>>8;
90 #undef tmp
91 t = ((i3&0x01)<<13 | i2<<5 | i1>>3) % 3;
92 ADD (t, n)
93 LDI (o, 10)
94 RCALL g();
95 ADD (acc, t)
96
97 //voice 4:
98 MOV (x, s)
99 INC (x)
100 #define tmp o
101 x = (x*0x33)>>8;
102 #undef tmp
103 t = 8 + n - (((i3&0x01)<<14 | i2<<6 | i1>>2) % 3);
104 LDI (o, 9)
105 RCALL g();
106 ADD (acc, t)
107
108 putchar(acc<<4);
109 #define tmp acc
110 LDI (tmp, 0)
111 SUBI (i0, -1)
112 ADC (i1, tmp, !i0)
113 ADC (i2, tmp, !i0&&!i1)
114 ADC (i3, tmp, !i0&&!i1&&!i2)
115 #undef tmp
116 }
117 }
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