| 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 | |