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1 | typedef unsigned char u8; | |
2 | ||
3 | u8 i0, i1, i2; //MEM | |
4 | u8 acc; //ACC | |
5 | ||
6 | u8 notes[] = { | |
7 | 0x84, 0x9d, 0xb0, 0x69, 0x9d, 0x84, 0x69, 0x58, | |
8 | 0x75, 0x8c, 0xb0, 0x69, 0x8c, 0x75, 0x69, 0x58 | |
9 | }; | |
10 | ||
11 | void g(u8 t){ | |
12 | u8 notes_ix = t & 0x7; | |
13 | if(3&i2) | |
14 | notes_ix += 8; | |
15 | u8 result = ((i1<<8|i0)*notes[notes_ix])>>8; // keep hi byte | |
16 | acc = result; | |
17 | } | |
18 | void main(void){ | |
19 | i0 = i1 = i2 = 0; | |
20 | for(;;) { | |
21 | u8 sample; | |
22 | u8 n = i2<<2 | i1>>6; | |
23 | u8 s = i2>>1; | |
24 | ||
25 | g(n); | |
26 | acc >>= 4; | |
27 | acc &= 1; | |
28 | sample = acc; | |
29 | ||
30 | { u8 tmp; | |
31 | tmp = i2<<3 | i1>>5; | |
32 | tmp ^= n; | |
33 | g(tmp); | |
34 | acc >>= 2; | |
35 | acc &= s; | |
36 | acc &= 3; | |
37 | sample += acc; | |
38 | } //tmp | |
39 | ||
40 | { u8 tmp1 = s/3; | |
41 | u8 tmp2; | |
42 | tmp2 = (i2<<5|i1>>3)%3; | |
43 | tmp2 += n; | |
44 | g(tmp2); | |
45 | acc >>= 2; | |
46 | acc &= tmp1; | |
47 | acc &= 3; | |
48 | sample += acc; | |
49 | } //tmp1, tmp2 | |
50 | ||
51 | { u8 tmp1 = s/5; | |
52 | u8 tmp2 = n; | |
53 | { u8 tmp3 = (i2<<6|i1>>2)%3; | |
54 | tmp2 -= tmp3; | |
55 | } // tmp3 | |
56 | tmp2 += 8; | |
57 | g(tmp2); | |
58 | acc >>= 1; | |
59 | acc &= tmp1; | |
60 | acc &= 3; | |
61 | sample += acc; | |
62 | } //tmp1, tmp2 | |
63 | ||
64 | putchar(sample<<4); | |
65 | ||
66 | i0++; | |
67 | i1 += !i0; | |
68 | i2 += !i1 && !i0; | |
69 | } | |
70 | } |