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annotate fmgen/opna.h @ 3:8ad174416431

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author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Tue, 21 May 2013 10:45:37 +0200
parents c55ea9478c80
children
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1 #ifndef __OPNA_H__
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2 #define __OPNA_H__
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3
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4 #include <stdint.h>
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5 #include "op.h"
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6 #include "psg.h"
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7
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8 // YM2608 (OPNA) ------------------------------------------------------
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9 typedef struct _OPNA
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10 {
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11 int fmvolume;
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12 uint32_t clock;
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13 uint32_t rate;
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14 uint32_t psgrate;
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15 uint32_t status;
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16 Channel4 ch[6];
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17 Channel4* csmch;
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18
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19 int32_t mixdelta;
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20 int mpratio;
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21 uint8_t interpolation;
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22
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23 uint8_t timer_status;
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24 uint8_t regtc;
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25 uint8_t regta[2];
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26
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27 int32_t timera, timera_count;
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28 int32_t timerb, timerb_count;
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29 int32_t timer_step;
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30 uint8_t prescale;
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31 uint8_t devmask;
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32
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33 PSG psg;
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34
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35 Rhythm rhythm[6];
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36 int8_t rhythmtl;
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37 int rhythmtvol;
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38 uint8_t rhythmkey;
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39
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40 int32_t mixl, mixl1;
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41 uint8_t pan[6];
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42 uint8_t fnum2[9];
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43
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44 uint8_t reg22;
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45 uint32_t reg29;
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46 uint32_t statusnext;
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47
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48 uint32_t lfocount;
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49 uint32_t lfodcount;
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50
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51 uint32_t fnum[6];
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52 uint32_t fnum3[3];
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53 } OPNA;
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54
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55 #ifdef __cplusplus
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56 extern "C" {
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57 #endif
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58
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59 // ---------------------------------------------------------------------------
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60 uint8_t OPNAInit(OPNA *opna, uint c, uint r, uint8_t ipflag);
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61 void OPNAReset(OPNA *opna);
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62 void SetVolumeFM(OPNA *opna, int db);
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63 void SetVolumeRhythmTotal(OPNA *opna, int db);
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64 uint8_t OPNASetRate(OPNA *opna, uint r, uint8_t ipflag);
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65 void OPNASetChannelMask(OPNA *opna, uint mask);
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66 void OPNASetReg(OPNA *opna, uint addr, uint data);
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67 uint8_t OPNATimerCount(OPNA *opna, int32_t us);
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68 void OPNAMix(OPNA *opna, Sample* buffer, uint32_t nsamples);
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69
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70 // ---------------------------------------------------------------------------
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71 static inline uint32_t ReadStatus(OPNA *opna) { return opna->status & 0x03; }
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72 static inline void SetVolumeRhythm(OPNA *opna, int index, int db)
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73 {
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74 db = Min(db, 20);
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75 opna->rhythm[index].volume = -(db * 2 / 3);
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76 }
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77
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78 static inline int32_t OPNAGetNextEvent(OPNA *opna)
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79 {
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80 uint32_t ta = ((opna->timera_count + 0xffff) >> 16) - 1;
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81 uint32_t tb = ((opna->timerb_count + 0xfff) >> 12) - 1;
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82 return (ta < tb ? ta : tb) + 1;
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83 }
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84
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85 #ifdef __cplusplus
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86 };
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87 #endif
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88
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89 #endif // FM_OPNA_H