YM2413Okazaki.hh

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#ifndef YM2413OKAZAKI_HH
#define YM2413OKAZAKI_HH

#include "YM2413Core.hh"
#include "FixedPoint.hh"
#include "serialize_meta.hh"

namespace openmsx {
namespace YM2413Okazaki {

class YM2413;

static constexpr int EP_FP_BITS = 15;
using EnvPhaseIndex = FixedPoint<EP_FP_BITS>;

enum EnvelopeState {
        ATTACK, DECAY, SUSHOLD, SUSTAIN, RELEASE, SETTLE, FINISH
};

class Patch {
public:
        Patch();

        void initModulator(const byte* data);
        void initCarrier  (const byte* data);

        inline void setKR(byte value);
        inline void setML(byte value);
        inline void setKL(byte value);
        inline void setTL(byte value);
        inline void setWF(byte value);
        inline void setFB(byte value);
        inline void setSL(byte value);

        const unsigned* WF; // 0-1    transformed to waveform[0-1]
        const byte* KL;     // 0-3    transformed to tllTable[0-3]
        unsigned SL;        // 0-15   transformed to slTable[0-15]
        byte AMPM;          // 0-3    2 packed booleans
        bool EG;            // 0-1
        byte KR;            // 0-1    transformed to 10,8
        byte ML;            // 0-15   transformed to mlTable[0-15]
        byte TL;            // 0-63   transformed to TL2EG(0..63) == [0..252]
        byte FB;            // 0,1-7  transformed to 0,7-1
        byte AR;            // 0-15
        byte DR;            // 0-15
        byte RR;            // 0-15
};

class Slot {
public:
        void reset();

        inline void setEnvelopeState(EnvelopeState state);
        inline bool isActive() const;

        inline void slotOn();
        inline void slotOn2();
        inline void slotOff();
        inline void setPatch(const Patch& patch);
        inline void setVolume(unsigned value);

        inline unsigned calc_phase(unsigned lfo_pm);
        template <bool HAS_AM, bool FIXED_ENV>
        inline unsigned calc_envelope(int lfo_am, unsigned fixed_env);
        template <bool HAS_AM> unsigned calc_fixed_env() const;
        void calc_envelope_outline(unsigned& out);
        template<bool HAS_AM, bool FIXED_ENV>
        inline int calc_slot_car(unsigned lfo_pm, int lfo_am, int fm, unsigned fixed_env);
        template<bool HAS_AM, bool HAS_FB, bool FIXED_ENV>
        inline int calc_slot_mod(unsigned lfo_pm, int lfo_am, unsigned fixed_env);

        inline int calc_slot_tom();
        inline int calc_slot_snare(bool noise);
        inline int calc_slot_cym(unsigned phase7, unsigned phase8);
        inline int calc_slot_hat(unsigned phase7, unsigned phase8, bool noise);
        inline void updatePG(unsigned freq);
        inline void updateTLL(unsigned freq, bool actAsCarrier);
        inline void updateRKS(unsigned freq);
        inline void updateEG();
        inline void updateAll(unsigned freq, bool actAsCarrier);

        template<typename Archive>
        void serialize(Archive& ar, unsigned version);

        // OUTPUT
        int feedback;
        int output;             // Output value of slot

        // for Phase Generator (PG)
        unsigned cphase;        // Phase counter
        unsigned dphase[8];     // Phase increment

        // for Envelope Generator (EG)
        unsigned volume;             // Current volume
        unsigned tll;                // Total Level + Key scale level
        const int* dphaseDRTableRks; // (converted to EnvPhaseIndex)
        EnvelopeState state;         // Current state
        EnvPhaseIndex eg_phase;      // Phase
        EnvPhaseIndex eg_dphase;     // Phase increment amount
        EnvPhaseIndex eg_phase_max;
        byte slot_on_flag;
        bool sustain;                // Sustain

        Patch patch;
        Slot* sibling; // pointer to sibling slot (only valid for car -> mod)
};

class Channel {
public:
        Channel();
        void reset(YM2413& ym2413);
        inline void setPatch(unsigned num, YM2413& ym2413);
        inline void setSustain(bool sustain, bool modActAsCarrier);
        inline void keyOn();
        inline void keyOff();

        Slot mod, car;

        template<typename Archive>
        void serialize(Archive& ar, unsigned version);
};

class YM2413 final : public YM2413Core
{
public:
        YM2413();

        inline void keyOn_BD();
        inline void keyOn_SD();
        inline void keyOn_TOM();
        inline void keyOn_HH();
        inline void keyOn_CYM();
        inline void keyOff_BD();
        inline void keyOff_SD();
        inline void keyOff_TOM();
        inline void keyOff_HH();
        inline void keyOff_CYM();
        inline void setRhythmFlags(byte old);
        inline void update_key_status();
        inline bool isRhythm() const;
        inline unsigned getFreq(unsigned channel) const;
        Patch& getPatch(unsigned instrument, bool carrier);

        template <unsigned FLAGS>
        inline void calcChannel(Channel& ch, int* buf, unsigned num);

        template<typename Archive>
        void serialize(Archive& ar, unsigned version);

private:
        // YM2413Core
        void reset() override;
        void writeReg(byte reg, byte data) override;
        byte peekReg(byte reg) const override;
        void generateChannels(int* bufs[9 + 5], unsigned num) override;
        int getAmplificationFactor() const override;

        Channel channels[9];

        unsigned pm_phase;

        unsigned am_phase;

        unsigned noise_seed;

        Patch patches[19][2];

        byte reg[0x40];
};

} // namespace YM2413Okazaki

SERIALIZE_CLASS_VERSION(YM2413Okazaki::Slot, 4);
SERIALIZE_CLASS_VERSION(YM2413Okazaki::Channel, 2);
SERIALIZE_CLASS_VERSION(YM2413Okazaki::YM2413, 3);

} // namespace openmsx

#endif