DSP.hpp

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//
// Created by Melefo on 28/01/2020.
//
 
#pragma once
 
#include <cstdint>
#include <array>
#include "Renderer/IRenderer.hpp"
#include "Memory/AMemory.hpp"
 
namespace ComSquare::APU
{
    class APU;
    struct MemoryMap;
}
 
namespace ComSquare::APU::DSP
{
    enum Envelope : uint {
        Release,
        Attack,
        Decay,
        Sustain
    };
 
    struct Master {
        std::array<uint8_t, 2> volume;
        bool mute : 1;
        bool reset : 1;
        std::array<uint16_t, 2> output;
        uint8_t unused;
    };
 
    struct Echo {
        std::array<uint8_t , 2> volume;
        uint8_t feedback;
        std::array<uint8_t, 8> FIR;
        uint8_t data;
        uint16_t offset;
        uint16_t length;
        uint8_t delay;
        bool enabled = true;
        bool toggle;
        std::array<std::array<int16_t, 8>, 2> history;
        uint8_t historyOffset;
        uint16_t address;
        uint8_t value;
        std::array<uint16_t, 2> input;
        std::array<uint16_t, 2> output;
    };
 
    struct Noise {
        uint8_t clock : 5;
        uint16_t lfsr = 0x4000;
    };
 
    struct BRR {
        uint8_t offset;
        uint8_t offsetAddr;
        uint16_t address;
        uint16_t nextAddress;
        uint8_t value;
        uint8_t header;
        uint8_t source;
    };
 
    struct Latch {
        uint8_t adsr1;
        uint8_t envx;
        uint8_t outx;
        uint16_t pitch;
        uint16_t output;
    };
 
    struct Voice {
        std::array<int8_t, 2> volume;
        union {
            struct {
                uint8_t pitchL;
                uint8_t pitchH;
            };
            uint16_t pitch;
        };
        uint8_t srcn;
        union {
            struct {
                uint8_t adsr1;
                uint8_t adsr2;
            };
            uint16_t adsr;
        };
        uint8_t gain;
        uint8_t envx;
        uint8_t outx;
        bool endx : 1;
 
        bool kon : 1;
        bool kof : 1;
        bool pmon : 1;
        bool non : 1;
        bool eon : 1;
 
        uint8_t konDelay;
        bool echo;
        bool loop;
        uint16_t brrAddress;
        uint8_t brrOffset = 1;
        bool prevPmon : 1;
        bool tempNon : 1;
        bool tempKon : 1;
        bool tempKof : 1;
        std::array<uint16_t, 12> samples;
        uint8_t sampleOffset;
        uint16_t envelope;
        uint16_t hiddenEnvelope;
        Envelope envelopeMode;
        uint16_t gaussOffset;
    };
 
    struct State
    {
        State(std::array<int16_t, 0x10000> &array, uint32_t size)
            : buffer(array), bufferSize(size)
        {};
 
        uint8_t voice = 0;
        std::array<int16_t, 0x10000> &buffer;
        uint32_t bufferSize;
        uint32_t bufferOffset = 0;
    };
 
    struct Timer {
        uint16_t counter;
        bool sample = true;
    };
 
    class DSP {
    private:
        std::array<uint16_t, 32> _rateModulus = {
                0, 2048, 1536, 1280, 1024, 768,
                640, 512, 384, 320, 256, 192,
                160, 128, 96, 80, 64, 48,
                40, 32, 24, 20, 16, 12,
                10, 8, 6, 5, 4, 3,
                2, 1
        };
 
        std::array<uint16_t, 32> _counterOffset = {
                0, 0, 1040, 536, 0, 1040,
                536, 0, 1040, 536, 0, 1040,
                536, 0, 1040, 536, 0, 1040,
                536, 0, 1040, 536, 0, 1040,
                536, 0, 1040, 536, 0, 1040,
                0,0
        };
 
        std::array<int16_t, 512> _gauss = {
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2,
            2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 5, 5, 5, 5,
            6, 6, 6, 6, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10, 10, 10,
            11, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 15, 16, 16, 17, 17,
            18, 19, 19, 20, 20, 21, 21, 22, 23, 23, 24, 24, 25, 26, 27, 27,
            28, 29, 29, 30, 31, 32, 32, 33, 34, 35, 36, 36, 37, 38, 39, 40,
            41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56,
            58, 59, 60, 61, 62, 64, 65, 66, 67, 69, 70, 71, 73, 74, 76, 77,
            78, 80, 81, 83, 84, 86, 87, 89, 90, 92, 94, 95, 97, 99, 100, 102,
            104, 106, 107, 109, 111, 113, 115, 117, 118, 120, 122, 124, 126, 128, 130, 132,
            134, 137, 139, 141, 143, 145, 147, 150, 152, 154, 156, 159, 161, 163, 166, 168,
            171, 173, 175, 178, 180, 183, 186, 188, 191, 193, 196, 199, 201, 204, 207, 210,
            212, 215, 218, 221, 224, 227, 230, 233, 236, 239, 242, 245, 248, 251, 254, 257,
            260, 263, 267, 270, 273, 276, 280, 283, 286, 290, 293, 297, 300, 304, 307, 311,
            314, 318, 321, 325, 328, 332, 336, 339, 343, 347, 351, 354, 358, 362, 366, 370,
            374, 378, 381, 385, 389, 393, 397, 401, 405, 410, 414, 418, 422, 426, 430, 434,
            439, 443, 447, 451, 456, 460, 464, 469, 473, 477, 482, 486, 491, 495, 499, 504,
            508, 513, 517, 522, 527, 531, 536, 540, 545, 550, 554, 559, 563, 568, 573, 577,
            582, 587, 592, 596, 601, 606, 611, 615, 620, 625, 630, 635, 640, 644, 649, 654,
            659, 664, 669, 674, 678, 683, 688, 693, 698, 703, 708, 713, 718, 723, 728, 732,
            737, 742, 747, 752, 757, 762, 767, 772, 777, 782, 787, 792, 797, 802, 806, 811,
            816, 821, 826, 831, 836, 841, 846, 851, 855, 860, 865, 870, 875, 880, 884, 889,
            894, 899, 904, 908, 913, 918, 923, 927, 932, 937, 941, 946, 951, 955, 960, 965,
            969, 974, 978, 983, 988, 992, 997, 1001, 1005, 1010, 1014, 1019, 1023, 1027, 1032, 1036,
            1040, 1045, 1049, 1053, 1057, 1061, 1066, 1070, 1074, 1078, 1082, 1086, 1090, 1094, 1098, 1102,
            1106, 1109, 1113, 1117, 1121, 1125, 1128, 1132, 1136, 1139, 1143, 1146, 1150, 1153, 1157, 1160,
            1164, 1167, 1170, 1174, 1177, 1180, 1183, 1186, 1190, 1193, 1196, 1199, 1202, 1205, 1207, 1210,
            1213, 1216, 1219, 1221, 1224, 1227, 1229, 1232, 1234, 1237, 1239, 1241, 1244, 1246, 1248, 1251,
            1253, 1255, 1257, 1259, 1261, 1263, 1265, 1267, 1269, 1270, 1272, 1274, 1275, 1277, 1279, 1280,
            1282, 1283, 1284, 1286, 1287, 1288, 1290, 1291, 1292, 1293, 1294, 1295, 1296, 1297, 1297, 1298,
            1299, 1300, 1300, 1301, 1302, 1302, 1303, 1303, 1303, 1304, 1304, 1304, 1304, 1304, 1305, 1305
        };
 
        std::array<int16_t, 0x10000> _soundBuffer = {};
        std::array<Voice, 8> _voices {};
        Master _master {};
        Echo _echo {};
        Noise _noise {};
        BRR _brr {};
        Latch _latch {};
        State _state;
        Timer _timer {};
 
        void voiceOutput(Voice &voice, bool channel);
        void voice1(Voice &voice);
        void voice2(Voice &voice);
        void voice3(Voice &voice);
        void voice3a(Voice &voice);
        void voice3b(Voice &voice);
        void voice3c(Voice &voice);
        void voice4(Voice &voice);
        void voice5(Voice &voice);
        void voice6(Voice &voice);
        void voice7(Voice &voice);
        void voice8(Voice &voice);
        void voice9(Voice &voice);
        void echo22();
        void echo23();
        void echo24();
        void echo25();
        void echo26();
        void echo27();
        void echo28();
        void echo29();
        void echo30();
        void misc27();
        void misc28();
        void misc29();
        void misc30();
 
        int32_t interpolate(const Voice &voice);
        void runEnvelope(Voice &voice);
 
        int32_t loadFIR(bool channel, int fir);
        void loadEcho(bool channel);
        int16_t outputEcho(bool channel);
        void writeEcho(bool channel);
 
        void timerTick();
        bool timerPoll(uint32_t rate);
 
        void decodeBRR(Voice &voice);
 
        MemoryMap &_map;
 
        Renderer::IRenderer &_renderer;
 
        uint8_t _readRAM(uint24_t addr);
        void _writeRAM(uint24_t addr, uint8_t data);
    public:
        DSP(Renderer::IRenderer &renderer, MemoryMap &map);
        DSP(const DSP &) = default;
        DSP &operator=(const DSP &) = delete;
        ~DSP() = default;
 
        [[nodiscard]] const std::array<Voice, 8> &getVoices() const;
        [[nodiscard]] const Master &getMaster() const;
        [[nodiscard]] const Echo &getEcho() const;
        [[nodiscard]] const Noise &getNoise() const;
        [[nodiscard]] const BRR &getBrr() const;
        [[nodiscard]] const Latch &getLatch() const;
 
        [[nodiscard]] uint8_t read(uint24_t addr) const;
        void write(uint24_t addr, uint8_t data);
 
        [[nodiscard]] std::string getName() const;
        void update();
 
        [[nodiscard]] Component getComponent() const;
 
        [[nodiscard]] uint24_t getSize() const;
        [[nodiscard]] int32_t getSamplesCount() const;
    };
}