mirror of
https://github.com/RetroDECK/Duckstation.git
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119 lines
2.9 KiB
C++
119 lines
2.9 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 StateWrapper;
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class System;
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class DMA;
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class MDEC
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{
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public:
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MDEC();
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~MDEC();
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bool Initialize(System* system, DMA* dma);
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void Reset();
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bool DoState(StateWrapper& sw);
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// I/O
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u32 ReadRegister(u32 offset);
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void WriteRegister(u32 offset, u32 value);
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u32 DMARead();
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void DMAWrite(u32 value);
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private:
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static constexpr u32 DATA_IN_FIFO_SIZE = 1048576;
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static constexpr u32 DATA_OUT_FIFO_SIZE = 1048576;
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enum DataOutputDepth : u8
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{
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DataOutputDepth_4Bit = 0,
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DataOutputDepth_8Bit = 1,
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DataOutputDepth_24Bit = 2,
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DataOutputDepth_15Bit = 3
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};
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enum class Command : u8
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{
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None = 0,
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DecodeMacroblock = 1,
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SetIqTab = 2,
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SetScale = 3
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};
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union StatusRegister
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{
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u32 bits;
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BitField<u32, bool, 31, 1> data_out_fifo_empty;
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BitField<u32, bool, 30, 1> data_in_fifo_full;
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BitField<u32, bool, 29, 1> command_busy;
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BitField<u32, bool, 28, 1> data_in_request;
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BitField<u32, bool, 27, 1> data_out_request;
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BitField<u32, DataOutputDepth, 25, 2> data_output_depth;
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BitField<u32, bool, 24, 1> data_output_signed;
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BitField<u32, u8, 23, 1> data_output_bit15;
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BitField<u32, u8, 16, 3> current_block;
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BitField<u32, u16, 0, 16> parameter_words_remaining;
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};
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union ControlRegister
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{
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u32 bits;
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BitField<u32, bool, 31, 1> reset;
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BitField<u32, bool, 30, 1> enable_dma_in;
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BitField<u32, bool, 29, 1> enable_dma_out;
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};
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union CommandWord
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{
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u32 bits;
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BitField<u32, Command, 29, 3> command;
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BitField<u32, DataOutputDepth, 27, 2> data_output_depth;
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BitField<u32, bool, 26, 1> data_output_signed;
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BitField<u32, u8, 25, 1> data_output_bit15;
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BitField<u32, u16, 0, 16> parameter_word_count;
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};
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void SoftReset();
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void UpdateStatusRegister();
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u32 ReadDataRegister();
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void WriteCommandRegister(u32 value);
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void HandleDecodeMacroblockCommand();
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void HandleSetQuantTableCommand();
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void HandleSetScaleCommand();
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const u16* DecodeColoredMacroblock(const u16* src, const u16* src_end);
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const u16* DecodeMonoMacroblock(const u16* src, const u16* src_end);
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// from nocash spec
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bool rl_decode_block(s16* blk, const u16*& src, const u16* src_end, const u8* qt);
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void IDCT(s16* blk);
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void yuv_to_rgb(u32 xx, u32 yy, const std::array<s16, 64>& Crblk, const std::array<s16, 64>& Cbblk,
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const std::array<s16, 64>& Yblk, std::array<u32, 256>& rgb_out);
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void y_to_mono(const std::array<s16, 64>& Yblk, std::array<u8, 64>& r_out);
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System* m_system = nullptr;
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DMA* m_dma = nullptr;
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StatusRegister m_status = {};
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InlineFIFOQueue<u32, DATA_IN_FIFO_SIZE> m_data_in_fifo;
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InlineFIFOQueue<u32, DATA_OUT_FIFO_SIZE> m_data_out_fifo;
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Command m_command = Command::None;
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u32 m_command_parameter_count = 0;
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std::array<u8, 64> m_iq_uv{};
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std::array<u8, 64> m_iq_y{};
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std::array<s16, 64> m_scale_table{};
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};
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