YM2413Okazaki.hh

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#ifndef YM2413OKAZAKI_HH
#define YM2413OKAZAKI_HH
 
#include "YM2413Core.hh"
#include "FixedPoint.hh"
#include "serialize_meta.hh"
#include <array>
#include <span>
 
namespace openmsx {
namespace YM2413Okazaki {
 
class YM2413;
 
inline constexpr int EP_FP_BITS = 15;
using EnvPhaseIndex = FixedPoint<EP_FP_BITS>;
 
// Size of sin table
inline constexpr int PG_BITS = 9;
inline constexpr int PG_WIDTH = 1 << PG_BITS;
inline constexpr int PG_MASK = PG_WIDTH - 1;
 
enum EnvelopeState {
        ATTACK, DECAY, SUSHOLD, SUSTAIN, RELEASE, SETTLE, FINISH
};
 
class Patch {
public:
        Patch();
 
        void initModulator(std::span<const uint8_t, 8> data);
        void initCarrier  (std::span<const uint8_t, 8> data);
 
        void setKR(uint8_t value);
        void setML(uint8_t value);
        void setKL(uint8_t value);
        void setTL(uint8_t value);
        void setWF(uint8_t value);
        void setFB(uint8_t value);
        void setSL(uint8_t value);
 
        std::span<const unsigned, PG_WIDTH> WF; // 0-1    transformed to waveform[0-1]
        std::span<const uint8_t, 16 * 8> KL;    // 0-3    transformed to tllTab[0-3]
        unsigned SL;        // 0-15   transformed to slTable[0-15]
        uint8_t AMPM = 0;   // 0-3    2 packed booleans
        bool EG = false;    // 0-1
        uint8_t KR;         // 0-1    transformed to 10,8
        uint8_t ML;         // 0-15   transformed to mlTable[0-15]
        uint8_t TL;         // 0-63   transformed to TL2EG(0..63) == [0..252]
        uint8_t FB;         // 0,1-7  transformed to 0,7-1
        uint8_t AR = 0;     // 0-15
        uint8_t DR = 0;     // 0-15
        uint8_t RR = 0;     // 0-15
};
 
class Slot {
public:
        Slot();
        void reset();
 
        void setEnvelopeState(EnvelopeState state);
        [[nodiscard]] bool isActive() const;
 
        void slotOn();
        void slotOn2();
        void slotOff();
        void setPatch(const Patch& patch);
        void setVolume(unsigned value);
 
        [[nodiscard]] unsigned calc_phase(unsigned lfo_pm);
        template<bool HAS_AM, bool FIXED_ENV>
        [[nodiscard]] unsigned calc_envelope(int lfo_am, unsigned fixed_env);
        template<bool HAS_AM> [[nodiscard]] unsigned calc_fixed_env() const;
        void calc_envelope_outline(unsigned& out);
        template<bool HAS_AM, bool FIXED_ENV>
        [[nodiscard]] 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>
        [[nodiscard]] int calc_slot_mod(unsigned lfo_pm, int lfo_am, unsigned fixed_env);
 
        [[nodiscard]] int calc_slot_tom();
        [[nodiscard]] int calc_slot_snare(bool noise);
        [[nodiscard]] int calc_slot_cym(unsigned phase7, unsigned phase8);
        [[nodiscard]] int calc_slot_hat(unsigned phase7, unsigned phase8, bool noise);
        void updatePG(unsigned freq);
        void updateTLL(unsigned freq, bool actAsCarrier);
        void updateRKS(unsigned freq);
        void updateEG();
        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
        std::array<unsigned, 8> dPhase; // Phase increment
 
        // for Envelope Generator (EG)
        unsigned volume;             // Current volume
        unsigned tll;                // Total Level + Key scale level
        std::span<const int, 16> dPhaseDRTableRks; // (converted to EnvPhaseIndex)
        EnvelopeState state;         // Current state
        EnvPhaseIndex eg_phase;      // Phase
        EnvPhaseIndex eg_dPhase;     // Phase increment amount
        EnvPhaseIndex eg_phase_max;
        uint8_t 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);
        void setPatch(unsigned num, YM2413& ym2413);
        void setSustain(bool sustain, bool modActAsCarrier);
        void keyOn();
        void keyOff();
 
        Slot mod, car;
 
        template<typename Archive>
        void serialize(Archive& ar, unsigned version);
};
 
class YM2413 final : public YM2413Core
{
public:
        YM2413();
 
        // YM2413Core
        void reset() override;
        void writePort(bool port, uint8_t value, int offset) override;
        void pokeReg(uint8_t reg, uint8_t data) override;
        [[nodiscard]] uint8_t peekReg(uint8_t reg) const override;
        void generateChannels(std::span<float*, 9 + 5> bufs, unsigned num) override;
        [[nodiscard]] float getAmplificationFactor() const override;
 
        [[nodiscard]] Patch& getPatch(unsigned instrument, bool carrier);
 
        template<typename Archive>
        void serialize(Archive& ar, unsigned version);
 
private:
        void writeReg(uint8_t r, uint8_t data);
 
        void keyOn_BD();
        void keyOn_SD();
        void keyOn_TOM();
        void keyOn_HH();
        void keyOn_CYM();
        void keyOff_BD();
        void keyOff_SD();
        void keyOff_TOM();
        void keyOff_HH();
        void keyOff_CYM();
        void setRhythmFlags(uint8_t old);
        void update_key_status();
        [[nodiscard]] bool isRhythm() const;
        [[nodiscard]] unsigned getFreq(unsigned channel) const;
 
        template<unsigned FLAGS>
        void calcChannel(Channel& ch, std::span<float> buf);
 
private:
        std::array<Channel, 9> channels;
 
        unsigned pm_phase;
 
        unsigned am_phase;
 
        unsigned noise_seed;
 
        std::array<std::array<Patch, 2>, 19> patches;
 
        std::array<uint8_t, 0x40> reg;
        uint8_t registerLatch;
};
 
} // namespace YM2413Okazaki
 
SERIALIZE_CLASS_VERSION(YM2413Okazaki::Slot, 4);
SERIALIZE_CLASS_VERSION(YM2413Okazaki::Channel, 2);
SERIALIZE_CLASS_VERSION(YM2413Okazaki::YM2413, 4);
 
} // namespace openmsx
 
#endif