mirror of
https://github.com/RetroDECK/Duckstation.git
synced 2024-10-23 23:55:42 +00:00
321 lines
8 KiB
C++
321 lines
8 KiB
C++
#pragma once
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#include "common/bitfield.h"
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#include "common/fifo_queue.h"
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#include "types.h"
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#include <array>
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class AudioStream;
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class StateWrapper;
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class System;
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class DMA;
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class InterruptController;
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class SPU
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{
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public:
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SPU();
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~SPU();
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void Initialize(System* system, DMA* dma, InterruptController* interrupt_controller);
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void Reset();
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bool DoState(StateWrapper& sw);
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u16 ReadRegister(u32 offset);
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void WriteRegister(u32 offset, u16 value);
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void DMARead(u32* words, u32 word_count);
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void DMAWrite(const u32* words, u32 word_count);
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void Execute(TickCount ticks);
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// Render statistics debug window.
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void DrawDebugStateWindow();
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// External input from CD controller.
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void AddCDAudioSample(s16 left, s16 right)
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{
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m_cd_audio_buffer.Push(left);
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m_cd_audio_buffer.Push(right);
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}
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void EnsureCDAudioSpace(u32 num_samples);
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private:
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static constexpr u32 RAM_SIZE = 512 * 1024;
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static constexpr u32 RAM_MASK = RAM_SIZE - 1;
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static constexpr u32 SPU_BASE = 0x1F801C00;
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static constexpr u32 NUM_VOICES = 24;
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static constexpr u32 NUM_VOICE_REGISTERS = 8;
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static constexpr u32 VOICE_ADDRESS_SHIFT = 3;
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static constexpr u32 NUM_SAMPLES_PER_ADPCM_BLOCK = 28;
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static constexpr u32 SAMPLE_RATE = 44100;
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static constexpr u32 SYSCLK_TICKS_PER_SPU_TICK = MASTER_CLOCK / SAMPLE_RATE; // 0x300
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static constexpr s16 ADSR_MIN_VOLUME = 0;
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static constexpr s16 ADSR_MAX_VOLUME = 0x7FFF;
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static constexpr u32 CD_AUDIO_SAMPLE_BUFFER_SIZE = 44100 * 2;
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static constexpr u32 CAPTURE_BUFFER_SIZE_PER_CHANNEL = 0x400;
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enum class RAMTransferMode : u8
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{
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Stopped = 0,
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ManualWrite = 1,
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DMAWrite = 2,
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DMARead = 3
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};
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union SPUCNT
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{
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u16 bits;
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BitField<u16, bool, 15, 1> enable;
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BitField<u16, bool, 14, 1> mute_n;
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BitField<u16, u8, 10, 4> noise_frequency_shift;
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BitField<u16, u8, 8, 2> noise_frequency_step;
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BitField<u16, bool, 7, 1> reverb_master_enable;
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BitField<u16, bool, 6, 1> irq9_enable;
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BitField<u16, RAMTransferMode, 4, 2> ram_transfer_mode;
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BitField<u16, bool, 3, 1> external_audio_reverb;
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BitField<u16, bool, 2, 1> cd_audio_reverb;
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BitField<u16, bool, 1, 1> external_audio_enable;
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BitField<u16, bool, 0, 1> cd_audio_enable;
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BitField<u16, u8, 0, 6> mode;
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};
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union SPUSTAT
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{
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u16 bits;
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BitField<u16, bool, 11, 1> second_half_capture_buffer;
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BitField<u16, bool, 10, 1> transfer_busy;
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BitField<u16, bool, 9, 1> dma_read_request;
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BitField<u16, bool, 8, 1> dma_write_request;
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BitField<u16, bool, 7, 1> dma_read_write_request;
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BitField<u16, bool, 6, 1> irq9_flag;
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BitField<u16, u8, 0, 6> mode;
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};
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union TransferControl
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{
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u16 bits;
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BitField<u8, u8, 1, 3> mode;
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};
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union ADSRRegister
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{
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u32 bits;
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struct
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{
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u16 bits_low;
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u16 bits_high;
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};
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BitField<u32, u8, 0, 4> sustain_level;
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BitField<u32, u8, 4, 4> decay_shift;
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BitField<u32, u8, 8, 2> attack_step;
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BitField<u32, u8, 10, 5> attack_shift;
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BitField<u32, bool, 15, 1> attack_exponential;
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BitField<u32, u8, 16, 5> release_shift;
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BitField<u32, bool, 21, 1> release_exponential;
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BitField<u32, u8, 22, 2> sustain_step;
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BitField<u32, u8, 24, 5> sustain_shift;
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BitField<u32, bool, 30, 1> sustain_direction_decrease;
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BitField<u32, bool, 31, 1> sustain_exponential;
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};
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union VolumeRegister
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{
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u16 bits;
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BitField<u16, bool, 15, 1> sweep_mode;
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BitField<u16, s16, 0, 15> fixed_volume; // divided by 2
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BitField<u16, bool, 14, 1> sweep_exponential;
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BitField<u16, bool, 13, 1> sweep_direction_decrease;
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BitField<u16, bool, 12, 1> sweep_phase_negative;
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BitField<u16, u8, 2, 5> sweep_shift;
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BitField<u16, u8, 0, 2> sweep_step;
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s16 GetVolume() { return fixed_volume * 2; }
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};
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// organized so we can replace this with a u16 array in the future
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union VoiceRegisters
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{
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u16 index[NUM_VOICE_REGISTERS];
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struct
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{
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VolumeRegister volume_left;
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VolumeRegister volume_right;
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u16 adpcm_sample_rate; // VxPitch
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u16 adpcm_start_address; // multiply by 8
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ADSRRegister adsr;
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s16 adsr_volume;
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u16 adpcm_repeat_address; // multiply by 8
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};
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};
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union VoiceCounter
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{
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// promoted to u32 because of overflow
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u32 bits;
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BitField<u32, u8, 4, 8> interpolation_index;
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BitField<u32, u8, 12, 5> sample_index;
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};
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union ADPCMFlags
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{
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u8 bits;
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BitField<u8, bool, 0, 1> loop_end;
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BitField<u8, bool, 1, 1> loop_repeat;
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BitField<u8, bool, 2, 1> loop_start;
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};
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struct ADPCMBlock
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{
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union
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{
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u8 bits;
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BitField<u8, u8, 0, 4> shift;
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BitField<u8, u8, 4, 3> filter;
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} shift_filter;
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ADPCMFlags flags;
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u8 data[NUM_SAMPLES_PER_ADPCM_BLOCK / 2];
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// For both 4bit and 8bit ADPCM, reserved shift values 13..15 will act same as shift=9).
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u8 GetShift() const
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{
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const u8 shift = shift_filter.shift;
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return (shift > 12) ? 9 : shift;
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}
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u8 GetFilter() const { return std::min<u8>(shift_filter.filter, 4); }
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u8 GetNibble(u32 index) const { return (data[index / 2] >> ((index % 2) * 4)) & 0x0F; }
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};
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enum class ADSRPhase : u8
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{
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Off = 0,
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Attack = 1,
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Decay = 2,
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Sustain = 3,
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Release = 4
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};
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struct ADSRTarget
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{
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s32 level;
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s16 step;
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u8 shift;
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bool decreasing;
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bool exponential;
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};
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struct Voice
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{
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u16 current_address;
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VoiceRegisters regs;
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VoiceCounter counter;
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ADPCMFlags current_block_flags;
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std::array<s16, NUM_SAMPLES_PER_ADPCM_BLOCK> current_block_samples;
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std::array<s16, 3> previous_block_last_samples;
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std::array<s32, 2> adpcm_last_samples;
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s32 last_amplitude;
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ADSRPhase adsr_phase;
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ADSRTarget adsr_target;
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TickCount adsr_ticks;
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TickCount adsr_ticks_remaining;
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s16 adsr_step;
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bool has_samples;
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bool IsOn() const { return adsr_phase != ADSRPhase::Off; }
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void KeyOn();
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void KeyOff();
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void DecodeBlock(const ADPCMBlock& block);
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s16 SampleBlock(s32 index) const;
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s16 Interpolate() const;
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// Switches to the specified phase, filling in target.
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void SetADSRPhase(ADSRPhase phase);
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// Updates the ADSR volume/phase.
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void TickADSR();
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};
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static constexpr s16 Clamp16(s32 value)
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{
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return (value < -0x8000) ? -0x8000 : (value > 0x7FFF) ? 0x7FFF : static_cast<s16>(value);
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}
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static constexpr s32 ApplyVolume(s32 sample, s16 volume) { return (sample * s32(volume)) >> 15; }
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static ADSRPhase GetNextADSRPhase(ADSRPhase phase);
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bool IsVoiceReverbEnabled(u32 i) const { return (m_reverb_on_register & (u32(1) << i)) != 0; }
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bool IsPitchModulationEnabled(u32 i) const
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{
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return (i > 0 && ((m_pitch_modulation_enable_register & (u32(1) << i)) != 0));
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}
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u16 ReadVoiceRegister(u32 offset);
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void WriteVoiceRegister(u32 offset, u16 value);
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void UpdateDMARequest();
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u16 RAMTransferRead();
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void RAMTransferWrite(u16 value);
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void CheckRAMIRQ(u32 address);
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void WriteToCaptureBuffer(u32 index, s16 value);
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void IncrementCaptureBufferPosition();
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void ReadADPCMBlock(u16 address, ADPCMBlock* block);
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std::tuple<s32, s32> SampleVoice(u32 voice_index);
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void GenerateSample();
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System* m_system = nullptr;
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DMA* m_dma = nullptr;
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InterruptController* m_interrupt_controller = nullptr;
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AudioStream* m_audio_stream = nullptr;
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SPUCNT m_SPUCNT = {};
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SPUSTAT m_SPUSTAT = {};
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TransferControl m_transfer_control = {};
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u16 m_transfer_address_reg = 0;
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u32 m_transfer_address = 0;
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u16 m_irq_address = 0;
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u16 m_capture_buffer_position = 0;
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VolumeRegister m_main_volume_left = {};
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VolumeRegister m_main_volume_right = {};
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s16 m_cd_audio_volume_left = 0;
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s16 m_cd_audio_volume_right = 0;
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u32 m_key_on_register = 0;
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u32 m_key_off_register = 0;
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u32 m_endx_register = 0;
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u32 m_reverb_on_register = 0;
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u32 m_noise_mode_register = 0;
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u32 m_pitch_modulation_enable_register = 0;
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TickCount m_ticks_carry = 0;
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std::array<Voice, NUM_VOICES> m_voices{};
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std::array<u8, RAM_SIZE> m_ram{};
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InlineFIFOQueue<s16, CD_AUDIO_SAMPLE_BUFFER_SIZE> m_cd_audio_buffer;
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}; |