720ee7f6 |
1 | /* faked 940 code just uses local copy of ym2612 */ |
2 | #include <stdio.h> |
3 | #include <stdlib.h> |
4 | #include <string.h> |
5 | #include <unistd.h> |
6 | #include <sys/mman.h> |
7 | #include <sys/ioctl.h> |
8 | #include <fcntl.h> |
9 | #include <errno.h> |
10 | |
11 | #include "../../Pico/sound/ym2612.h" |
12 | #include "../gp2x/gp2x.h" |
13 | #include "../gp2x/emu.h" |
14 | #include "../gp2x/menu.h" |
15 | |
16 | |
17 | static YM2612 ym2612; |
18 | |
19 | YM2612 *ym2612_940 = &ym2612; |
20 | int mix_buffer_[44100/50*2]; /* this is where the YM2612 samples will be mixed to */ |
21 | int *mix_buffer = mix_buffer_; |
22 | |
23 | |
24 | /***********************************************************/ |
25 | |
26 | #define MAXOUT (+32767) |
27 | #define MINOUT (-32768) |
28 | |
29 | /* limitter */ |
30 | #define Limit(val, max,min) { \ |
31 | if ( val > max ) val = max; \ |
32 | else if ( val < min ) val = min; \ |
33 | } |
34 | |
35 | |
36 | int YM2612Write_940(unsigned int a, unsigned int v) |
37 | { |
38 | YM2612Write_(a, v); |
39 | |
40 | return 0; // cause the engine to do updates once per frame only |
41 | } |
42 | |
43 | UINT8 YM2612Read_940(void) |
44 | { |
45 | return YM2612Read_(); |
46 | } |
47 | |
48 | |
49 | int YM2612PicoTick_940(int n) |
50 | { |
51 | YM2612PicoTick_(n); |
52 | |
53 | return 0; |
54 | } |
55 | |
56 | |
57 | void YM2612PicoStateLoad_940(void) |
58 | { |
59 | int i; |
60 | |
61 | YM2612PicoStateLoad_(); |
62 | |
63 | for(i = 0; i < 0x100; i++) { |
64 | YM2612Write_(0, i); |
65 | YM2612Write_(1, ym2612.REGS[i]); |
66 | } |
67 | for(i = 0; i < 0x100; i++) { |
68 | YM2612Write_(2, i); |
69 | YM2612Write_(3, ym2612.REGS[i|0x100]); |
70 | } |
71 | } |
72 | |
73 | |
74 | void YM2612Init_940(int baseclock, int rate) |
75 | { |
76 | YM2612Init_(baseclock, rate); |
77 | } |
78 | |
79 | |
80 | void YM2612ResetChip_940(void) |
81 | { |
82 | YM2612ResetChip_(); |
83 | } |
84 | |
85 | |
86 | void YM2612UpdateOne_940(short *buffer, int length, int stereo) |
87 | { |
88 | int i; |
89 | |
90 | YM2612UpdateOne_(buffer, length, stereo); |
91 | |
92 | /* mix data */ |
93 | if (stereo) { |
94 | int *mb = mix_buffer; |
95 | for (i = length; i > 0; i--) { |
96 | int l, r; |
97 | l = r = *buffer; |
98 | l += *mb++, r += *mb++; |
99 | Limit( l, MAXOUT, MINOUT ); |
100 | Limit( r, MAXOUT, MINOUT ); |
101 | *buffer++ = l; *buffer++ = r; |
102 | } |
103 | } else { |
104 | for (i = 0; i < length; i++) { |
105 | int l = mix_buffer[i]; |
106 | l += buffer[i]; |
107 | Limit( l, MAXOUT, MINOUT ); |
108 | buffer[i] = l; |
109 | } |
110 | } |
111 | } |
112 | |