1 /* 2 header file for software emulation for FM sound generator 3 4 */ 5 #ifndef _H_FM_FM_ 6 #define _H_FM_FM_ 7 8 /* compiler dependence */ 9 #ifndef UINT8 10 typedef unsigned char UINT8; /* unsigned 8bit */ 11 typedef unsigned short UINT16; /* unsigned 16bit */ 12 typedef unsigned int UINT32; /* unsigned 32bit */ 13 #endif 14 #ifndef INT8 15 typedef signed char INT8; /* signed 8bit */ 16 typedef signed short INT16; /* signed 16bit */ 17 typedef signed int INT32; /* signed 32bit */ 18 #endif 19 20 #if 1 21 /* struct describing a single operator (SLOT) */ 22 typedef struct 23 { 24 INT32 *DT; /* #0x00 detune :dt_tab[DT] */ 25 UINT8 ar; /* #0x04 attack rate */ 26 UINT8 d1r; /* #0x05 decay rate */ 27 UINT8 d2r; /* #0x06 sustain rate */ 28 UINT8 rr; /* #0x07 release rate */ 29 UINT32 mul; /* #0x08 multiple :ML_TABLE[ML] */ 30 31 /* Phase Generator */ 32 UINT32 phase; /* #0x0c phase counter | need_save */ 33 UINT32 Incr; /* #0x10 phase step */ 34 35 UINT8 KSR; /* #0x14 key scale rate :3-KSR */ 36 UINT8 ksr; /* #0x15 key scale rate :kcode>>(3-KSR) */ 37 38 UINT8 key; /* #0x16 0=last key was KEY OFF, 1=KEY ON */ 39 40 /* Envelope Generator */ 41 UINT8 state; /* #0x17 phase type: EG_OFF=0, EG_REL, EG_SUS, EG_DEC, EG_ATT | need_save */ 42 UINT16 tl; /* #0x18 total level: TL << 3 */ 43 INT16 volume; /* #0x1a envelope counter | need_save */ 44 UINT32 sl; /* #0x1c sustain level:sl_table[SL] */ 45 46 /* asm relies on this order: */ 47 union { 48 struct { 49 UINT32 eg_pack_rr; /* #0x20 1 (release state) */ 50 UINT32 eg_pack_d2r; /* #0x24 2 (sustain state) */ 51 UINT32 eg_pack_d1r; /* #0x28 3 (decay state) */ 52 UINT32 eg_pack_ar; /* #0x2c 4 (attack state) */ 53 }; 54 UINT32 eg_pack[4]; 55 }; 56 } FM_SLOT; 57 58 59 typedef struct 60 { 61 FM_SLOT SLOT[4]; /* four SLOTs (operators) */ 62 63 UINT8 ALGO; /* +00 algorithm */ 64 UINT8 FB; /* feedback shift */ 65 UINT8 pad[2]; 66 INT32 op1_out; /* op1 output for feedback */ 67 68 INT32 mem_value; /* +08 delayed sample (MEM) value */ 69 70 INT32 pms; /* channel PMS */ 71 UINT8 ams; /* channel AMS */ 72 73 UINT8 kcode; /* +11 key code: */ 74 UINT8 fn_h; /* freq latch */ 75 UINT8 pad2; 76 UINT32 fc; /* fnum,blk:adjusted to sample rate */ 77 UINT32 block_fnum; /* current blk/fnum value for this slot (can be different betweeen slots of one channel in 3slot mode) */ 78 79 /* LFO */ 80 UINT8 AMmasks; /* AM enable flag */ 81 UINT8 pad3[3]; 82 } FM_CH; 83 84 typedef struct 85 { 86 int clock; /* master clock (Hz) */ 87 int rate; /* sampling rate (Hz) */ 88 double freqbase; /* 08 frequency base */ 89 UINT8 address; /* 10 address register | need_save */ 90 UINT8 status; /* 11 status flag | need_save */ 91 UINT8 mode; /* mode CSM / 3SLOT */ 92 UINT8 pad; 93 int TA; /* timer a */ 94 int TAC; /* timer a maxval */ 95 int TAT; /* timer a ticker | need_save */ 96 UINT8 TB; /* timer b */ 97 UINT8 pad2[3]; 98 int TBC; /* timer b maxval */ 99 int TBT; /* timer b ticker | need_save */ 100 /* local time tables */ 101 INT32 dt_tab[8][32];/* DeTune table */ 102 } FM_ST; 103 104 /***********************************************************/ 105 /* OPN unit */ 106 /***********************************************************/ 107 108 /* OPN 3slot struct */ 109 typedef struct 110 { 111 UINT32 fc[3]; /* fnum3,blk3: calculated */ 112 UINT8 fn_h; /* freq3 latch */ 113 UINT8 kcode[3]; /* key code */ 114 UINT32 block_fnum[3]; /* current fnum value for this slot (can be different betweeen slots of one channel in 3slot mode) */ 115 } FM_3SLOT; 116 117 /* OPN/A/B common state */ 118 typedef struct 119 { 120 FM_ST ST; /* general state */ 121 FM_3SLOT SL3; /* 3 slot mode state */ 122 UINT32 pan; /* fm channels output mask (bit 1 = enable) */ 123 124 UINT32 eg_cnt; /* global envelope generator counter | need_save */ 125 UINT32 eg_timer; /* global envelope generator counter works at frequency = chipclock/64/3 | need_save */ 126 UINT32 eg_timer_add; /* step of eg_timer */ 127 128 /* LFO */ 129 UINT32 lfo_cnt; /* need_save */ 130 UINT32 lfo_inc; 131 132 UINT32 lfo_freq[8]; /* LFO FREQ table */ 133 } FM_OPN; 134 135 /* here's the virtual YM2612 */ 136 typedef struct 137 { 138 UINT8 REGS[0x200]; /* registers (for save states) */ 139 INT32 addr_A1; /* address line A1 | need_save */ 140 141 FM_CH CH[6]; /* channel state */ 142 143 /* dac output (YM2612) */ 144 int dacen; 145 INT32 dacout; 146 147 FM_OPN OPN; /* OPN state */ 148 149 UINT32 slot_mask; /* active slot mask (performance hack) */ 150 } YM2612; 151 #endif 152 153 #ifndef EXTERNAL_YM2612 154 extern YM2612 ym2612; 155 #endif 156 157 void YM2612Init_(int baseclock, int rate); 158 void YM2612ResetChip_(void); 159 int YM2612UpdateOne_(int *buffer, int length, int stereo, int is_buf_empty); 160 161 int YM2612Write_(unsigned int a, unsigned int v); 162 //unsigned char YM2612Read_(void); 163 164 int YM2612PicoTick_(int n); 165 void YM2612PicoStateLoad_(void); 166 167 void *YM2612GetRegs(void); 168 void YM2612PicoStateSave2(int tat, int tbt); 169 int YM2612PicoStateLoad2(int *tat, int *tbt); 170 171 #ifndef __GP2X__ 172 #define YM2612Init YM2612Init_ 173 #define YM2612ResetChip YM2612ResetChip_ 174 #define YM2612UpdateOne YM2612UpdateOne_ 175 #define YM2612PicoStateLoad YM2612PicoStateLoad_ 176 #else 177 /* GP2X specific */ 178 #include "../../platform/gp2x/940ctl.h" 179 extern int PicoIn.opt; 180 #define YM2612Init(baseclock,rate) { \ 181 if (PicoIn.opt&0x200) YM2612Init_940(baseclock, rate); \ 182 else YM2612Init_(baseclock, rate); \ 183 } 184 #define YM2612ResetChip() { \ 185 if (PicoIn.opt&0x200) YM2612ResetChip_940(); \ 186 else YM2612ResetChip_(); \ 187 } 188 #define YM2612UpdateOne(buffer,length,stereo,is_buf_empty) \ 189 (PicoIn.opt&0x200) ? YM2612UpdateOne_940(buffer, length, stereo, is_buf_empty) : \ 190 YM2612UpdateOne_(buffer, length, stereo, is_buf_empty); 191 #define YM2612PicoStateLoad() { \ 192 if (PicoIn.opt&0x200) YM2612PicoStateLoad_940(); \ 193 else YM2612PicoStateLoad_(); \ 194 } 195 #endif /* __GP2X__ */ 196 197 198 #endif /* _H_FM_FM_ */ 199