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[Chiptunes.git] / foo.c
CommitLineData
61fab018 1#include <stdio.h>
da32ed67 2#include "fakeasm.h"
61fab018 3typedef unsigned char u8;
da32ed67 4
24abdcbb
TG
5u8 data[] = {
6 0x84, 0x9d, 0xb0, 0x69, 0x9d, 0x84, 0x69, 0x58,
7 0x75, 0x8c, 0xb0, 0x69, 0x8c, 0x75, 0x69, 0x58
8};
06aad1ff
TG
9u8 i0;
10u8 i1;
11u8 i2;
12u8 i3;
3b86ca43
TG
13u8 x;
14u8 t;
15u8 o;
965274e2 16void g(void) {
46a8d83c 17 // g(i, x, t, o) -> t
63363195 18 u8 tmp;
0f219114 19 ANDI (t, 0x07)
32632e61 20 MOV (tmp, i2)
63363195 21 ANDI (tmp, 3)
09cf3949
TG
22 TST (tmp)
23 BREQ (skip)
24 SUBI (t, -8)
25 skip:
c616f0c2 26 t = data[t];
965274e2 27 t = ((i3<<24|i2<<16|i1<<8|i0)*t) >> o;
c616f0c2
TG
28 AND (t, x)
29 ANDI (t, 3)
46a8d83c 30 RET
61fab018
TG
31};
32
33int main(void) {
a1631438
TG
34 u8 n;
35 u8 s;
ab6fe4c2 36 u8 acc;
89f35588 37 //TODO: clear all vars/registers
5dd8b8ff 38 for (;;) {
ab6fe4c2 39 acc = 0;
7874ed03
TG
40 MOV (n, i2)
41 LSL (n)
42 LSL (n)
43 n = (n | i1>>6);
b67a2de3 44 s = (i3<<7 | i2>>1);
3b86ca43
TG
45
46 //voice 1:
47 LDI (x, 1)
48 MOV (t, n)
49 LDI (o, 12)
965274e2 50 RCALL g();
46a8d83c 51 MOV (acc, t)
3b86ca43
TG
52
53 //voice 2:
54 MOV (x, s)
1b023e92 55 #define tmp o
94c4920f
TG
56 MOV (tmp, i2)
57 LSL (tmp)
58 LSL (tmp)
59 LSL (tmp)
60 MOV (t, i1)
4b0b7dc5
TG
61 SWAP (t)
62 ANDI (t, 0xf)
63 LSR (t)
94c4920f 64 OR (t, tmp)
1b023e92 65 #undef tmp
23872091 66 EOR (t, n)
3b86ca43 67 LDI (o, 10)
965274e2 68 RCALL g();
46a8d83c 69 ADD (acc, t)
3b86ca43
TG
70
71 //voice 3:
72 x = s / 3;
d9218a18 73 t = n + ((i3<<13 | i2<<5 | i1>>3) % 3);
3b86ca43 74 LDI (o, 10)
965274e2 75 RCALL g();
46a8d83c 76 ADD (acc, t)
3b86ca43
TG
77
78 //voice 4:
79 x = s / 5;
704b11ab 80 t = 8 + n - ((i3<<14 | i2<<6 | i1>>2) % 3);
3b86ca43 81 LDI (o, 9)
965274e2 82 RCALL g();
46a8d83c 83 ADD (acc, t)
bfce2f8c 84
ab6fe4c2 85 putchar(acc<<4);
89f35588
TG
86 #define tmp acc
87 LDI (tmp, 0)
88 SUBI (i0, -1)
89 ADC (i1, tmp, !i0)
90 ADC (i2, tmp, !i0&&!i1)
91 ADC (i3, tmp, !i0&&!i1&&!i2)
dd7bbc4a 92 #undef tmp
fe9a76e4 93 }
61fab018 94}
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