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#ifndef LIBOPNA_OPNASSG_H_INCLUDED
#define LIBOPNA_OPNASSG_H_INCLUDED
#include <stdint.h>
#include <stdbool.h>
#ifdef __cplusplus
extern "C" {
#endif
struct opna_ssg_ch {
uint16_t tone_counter;
bool out;
};
struct opna_ssg {
uint8_t regs[0x10];
struct opna_ssg_ch ch[3];
uint8_t noise_counter;
uint32_t lfsr;
uint16_t env_counter;
uint8_t env_level;
bool env_att;
bool env_alt;
bool env_hld;
bool env_holding;
};
struct opna_ssg_resampler {
int16_t buf[(1<<7)];
unsigned index;
};
void opna_ssg_reset(struct opna_ssg *ssg);
void opna_ssg_resampler_reset(struct opna_ssg_resampler *resampler);
// generate raw data
// Monoral
// Output level: [-32766, 32766]
// Samplerate: clock / 8
// (on opna: masterclock / 32
// 7987200 / 32 = 249600)
void opna_ssg_generate_raw(struct opna_ssg *ssg, int16_t *buf, int samples);
// mix samplerate converted data for mixing with OPNA output
// call to buffer written with OPNA output
// samplerate: 7987200/144 Hz
// (55466.66..) Hz
void opna_ssg_mix_55466(
struct opna_ssg *ssg, struct opna_ssg_resampler *resampler,
int16_t *buf, int samples);
void opna_ssg_writereg(struct opna_ssg *ssg, unsigned reg, unsigned val);
// channel level (0 - 31)
int opna_ssg_channel_level(const struct opna_ssg *ssg, int ch);
#ifdef __cplusplus
}
#endif
#endif // LIBOPNA_OPNASSG_H_INCLUDED
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