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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];
9401049b 27 t = (((i1&0x1f)<<8|i0)*t)>>8 >> 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 (;;) {
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39 MOV (n, i2)
40 LSL (n)
41 LSL (n)
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42 #define tmp acc
43 MOV (tmp, i1)
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44 SWAP (tmp)
45 ANDI (tmp, 0x0f)
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46 LSR (tmp)
47 LSR (tmp)
128ff01a 48 OR (n, tmp)
bc7680e3 49 #undef tmp
df192822 50 MOV (s, i3)
27b03017
TG
51 ROR (s)
52 ROR (s)
53 ANDI (s, 0x80)
a582bbc3
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54 #define tmp acc
55 MOV (tmp, i2)
56 LSR (tmp)
e389879f 57 OR (s, tmp)
df192822 58 #undef tmp
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59
60 //voice 1:
61 LDI (x, 1)
62 MOV (t, n)
9401049b 63 LDI (o, 4)
965274e2 64 RCALL g();
46a8d83c 65 MOV (acc, t)
3b86ca43
TG
66
67 //voice 2:
68 MOV (x, s)
1b023e92 69 #define tmp o
94c4920f
TG
70 MOV (tmp, i2)
71 LSL (tmp)
72 LSL (tmp)
73 LSL (tmp)
74 MOV (t, i1)
4b0b7dc5
TG
75 SWAP (t)
76 ANDI (t, 0xf)
77 LSR (t)
94c4920f 78 OR (t, tmp)
1b023e92 79 #undef tmp
23872091 80 EOR (t, n)
9401049b 81 LDI (o, 2)
965274e2 82 RCALL g();
46a8d83c 83 ADD (acc, t)
3b86ca43
TG
84
85 //voice 3:
2666c079
TG
86 MOV (x, s)
87 INC (x)
17c5b4e9 88 #define tmp o
a7a7abba 89 MOV (tmp, x)
546b5bab 90 ROR (tmp)
546b5bab
TG
91 LSR (tmp)
92 ADD (tmp, x)
93 ROR (tmp)
546b5bab
TG
94 LSR (tmp)
95 ADD (tmp, x)
96 ROR (tmp)
546b5bab
TG
97 LSR (tmp)
98 ADD (tmp, x)
99 ROR (tmp)
546b5bab 100 LSR (tmp)
2c94c801 101 MOV (x, tmp)
17c5b4e9 102 #undef tmp
18570947
TG
103 t = ((i3&0x01)<<13 | i2<<5 | i1>>3) % 3;
104 ADD (t, n)
9401049b 105 LDI (o, 2)
965274e2 106 RCALL g();
46a8d83c 107 ADD (acc, t)
3b86ca43
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108
109 //voice 4:
6bc3ca83
TG
110 MOV (x, s)
111 INC (x)
112 #define tmp o
546b5bab 113 unsigned short sum = 0; //XXX
43572923
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114 sum += x;
115 sum >>= 1;
116 sum += x;
117 sum >>= 1;
118 //nop
119 sum >>= 1;
120 //nop
dc6579a6
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121 sum >>= 1;
122 sum += x;
123 sum >>= 1;
124 sum += x;
125 sum >>= 1;
126 //nop
127 sum >>= 1;
128 //nop
dc6579a6
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129 sum >>= 1;
130 x = sum;
6bc3ca83 131 #undef tmp
e4f7baf0
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132 t = ((i3&0x01)<<14 | i2<<6 | i1>>2) % 3;
133 SUB (t, n)
134 NEG (t)
902cfdea 135 SUBI (t, -8)
9401049b 136 LDI (o, 1)
965274e2 137 RCALL g();
46a8d83c 138 ADD (acc, t)
bfce2f8c 139
ab6fe4c2 140 putchar(acc<<4);
89f35588
TG
141 #define tmp acc
142 LDI (tmp, 0)
143 SUBI (i0, -1)
144 ADC (i1, tmp, !i0)
145 ADC (i2, tmp, !i0&&!i1)
146 ADC (i3, tmp, !i0&&!i1&&!i2)
dd7bbc4a 147 #undef tmp
fe9a76e4 148 }
61fab018 149}
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