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annotate fmgen/psg.h @ 10:e3849cd10ad3 default tip

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author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Mon, 08 Sep 2014 17:44:53 +0200
parents c55ea9478c80
children
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1 #ifndef __PSG_H__
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2 #define __PSG_H__
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3
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4 #include <stdint.h>
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5 #define PSG_SAMPLETYPE int32_t // any of int16_t, int32_t or float will work here.
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6
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7 // Constants for the shift amounts used in the counters.
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8 //
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9 enum {
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10 toneshift = 24,
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11 envshift = 22
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12 };
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13
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14 typedef struct _PSG {
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15 uint8_t reg[16];
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16
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17 const uint32_t *envelop;
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18 uint32_t rng;
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19 uint32_t olevel[3];
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20 uint32_t scount[3], speriod[3];
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21 uint32_t ecount, eperiod;
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22 uint32_t ncount, nperiod;
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23 uint32_t tperiodbase;
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24 uint32_t eperiodbase;
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25 int volume;
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26 int mask;
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27 } PSG;
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28
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29 #ifdef __cplusplus
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30 extern "C" {
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31 #endif
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32
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33 // Mostly self-explanatory.
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34 // Actual descriptions of each function can be found in psg.c
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35 // Also, PSGGetReg() is basically useless.
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36 // (More info on that can *also* be found in psg.c).
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37 void PSGInit(PSG *psg);
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38 void PSGReset(PSG *psg);
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39 void PSGSetClock(PSG *psg, uint32_t clock, uint32_t rate);
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40 void SetVolumePSG(PSG *psg, int volume);
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41 void PSGSetChannelMask(PSG *psg, int c);
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42 void PSGSetReg(PSG *psg, uint8_t regnum, uint8_t data);
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43 void PSGMix(PSG *psg, int32_t *dest, uint32_t nsamples);
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44
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45 static inline uint32_t PSGGetReg(PSG *psg, uint8_t regnum) {
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46 return psg->reg[regnum & 0x0f];
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47 }
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48
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49 #ifdef __cplusplus
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50 };
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51 #endif
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52
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53 #endif // PSG_H