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#ifndef LIBOPNA_OPNAFM_H_INCLUDED
#define LIBOPNA_OPNAFM_H_INCLUDED
#include <stdint.h>
#include <stdbool.h>
#ifdef __cplusplus
extern "C" {
#endif
#define LIBOPNA_FM_ENV_MAX 1023
enum {
ENV_ATTACK,
ENV_DECAY,
ENV_SUSTAIN,
ENV_RELEASE,
ENV_OFF,
};
struct opna_fm_slot {
// 20bits, upper 10 bits will be the index to sine table
uint32_t phase;
// 10 bits
uint16_t env;
// 12 bits
uint16_t env_hires;
uint16_t env_count;
uint8_t env_state;
uint8_t rate_shifter;
uint8_t rate_selector;
uint8_t rate_mul;
uint8_t tl;
uint8_t sl;
uint8_t ar;
uint8_t dr;
uint8_t sr;
uint8_t rr;
uint8_t mul;
uint8_t det;
uint8_t ks;
uint8_t keycode;
bool keyon;
};
struct opna_fm_channel {
struct opna_fm_slot slot[4];
// save 2 samples for slot 1 feedback
uint16_t fbmem1;
uint16_t fbmem2;
// save sample for long (>2) chain of slots
uint16_t alg_mem;
uint8_t alg;
uint8_t fb;
uint16_t fnum;
uint8_t blk;
};
struct opna_fm {
struct opna_fm_channel channel[6];
// remember here what was written on higher byte,
// actually write when lower byte written
uint8_t blkfnum_h;
// channel 3 blk, fnum
struct {
uint16_t fnum[3];
uint8_t blk[3];
uint8_t mode;
} ch3;
// do envelope once per 3 samples
uint8_t env_div3;
// pan
bool lselect[6];
bool rselect[6];
// mask
// when (1<<channel), the channel is masked
unsigned mask;
};
void opna_fm_reset(struct opna_fm *fm);
void opna_fm_mix(struct opna_fm *fm, int16_t *buf, unsigned samples);
void opna_fm_writereg(struct opna_fm *fm, unsigned reg, unsigned val);
//
void opna_fm_chan_reset(struct opna_fm_channel *chan);
void opna_fm_chan_phase(struct opna_fm_channel *chan);
void opna_fm_chan_env(struct opna_fm_channel *chan);
void opna_fm_chan_set_blkfnum(struct opna_fm_channel *chan, unsigned blk, unsigned fnum);
int16_t opna_fm_chanout(struct opna_fm_channel *chan);
void opna_fm_slot_key(struct opna_fm_channel *chan, int slotnum, bool keyon);
void opna_fm_chan_set_alg(struct opna_fm_channel *chan, unsigned alg);
void opna_fm_chan_set_fb(struct opna_fm_channel *chan, unsigned fb);
void opna_fm_slot_set_ar(struct opna_fm_slot *slot, unsigned ar);
void opna_fm_slot_set_dr(struct opna_fm_slot *slot, unsigned dr);
void opna_fm_slot_set_sr(struct opna_fm_slot *slot, unsigned sr);
void opna_fm_slot_set_rr(struct opna_fm_slot *slot, unsigned rr);
void opna_fm_slot_set_sl(struct opna_fm_slot *slot, unsigned sl);
void opna_fm_slot_set_tl(struct opna_fm_slot *slot, unsigned tl);
void opna_fm_slot_set_ks(struct opna_fm_slot *slot, unsigned ks);
void opna_fm_slot_set_mul(struct opna_fm_slot *slot, unsigned mul);
void opna_fm_slot_set_det(struct opna_fm_slot *slot, unsigned det);
#ifdef __cplusplus
}
#endif
#endif /* LIBOPNA_OPNAFM_H_INCLUDED */
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