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53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
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#ifndef __PSG_H__
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#define __PSG_H__
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#include <stdint.h>
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#define PSG_SAMPLETYPE int32_t /* any of int16_t, int32_t or float will work here. */
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/* Constants for the shift amounts used in the counters.
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*/
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enum {
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toneshift = 24,
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envshift = 22
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};
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typedef struct _PSG {
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uint8_t reg[16];
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const uint32_t *envelop;
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uint32_t rng;
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uint32_t olevel[3];
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uint32_t scount[3], speriod[3];
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uint32_t ecount, eperiod;
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uint32_t ncount, nperiod;
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uint32_t tperiodbase;
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uint32_t eperiodbase;
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int volume;
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int mask;
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} PSG;
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Mostly self-explanatory.
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// Actual descriptions of each function can be found in psg.c
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// Also, PSGGetReg() is basically useless.
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// (More info on that can *also* be found in psg.c). */
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void PSGInit(PSG *psg);
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void PSGReset(PSG *psg);
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void PSGSetClock(PSG *psg, uint32_t clock, uint32_t rate);
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void PSGSetChannelMask(PSG *psg, int c);
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void PSGSetReg(PSG *psg, uint8_t regnum, uint8_t data);
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void PSGMix(PSG *psg, int32_t *dest, uint32_t nsamples);
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static inline uint32_t PSGGetReg(PSG *psg, uint8_t regnum) {
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return psg->reg[regnum & 0x0f];
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* PSG_H */
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