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171 lines
3.1 KiB
C++
171 lines
3.1 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "MemoryManager.h"
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#include "IVideoDevice.h"
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enum PPURegisters
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{
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Control = 0x00,
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Control2 = 0x01,
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Status = 0x02,
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SpriteAddr = 0x03,
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SpriteData = 0x04,
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ScrollOffsets = 0x05,
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VideoMemoryAddr = 0x06,
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VideoMemoryData = 0x07,
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SpriteDMA = 0x4014,
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};
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struct PPUControlFlags
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{
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uint16_t NameTableAddr;
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bool VerticalWrite;
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uint16_t SpritePatternAddr;
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uint16_t BackgroundPatternAddr;
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bool LargeSprites;
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bool VBlank;
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bool Grayscale;
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bool BackgroundMask;
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bool SpriteMask;
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bool BackgroundEnabled;
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bool SpritesEnabled;
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bool IntensifyRed;
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bool IntensifyGreen;
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bool IntensifyBlue;
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};
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struct PPUStatusFlags
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{
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bool SpriteOverflow;
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bool Sprite0Hit;
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bool VerticalBlank;
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};
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struct PPUState
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{
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uint8_t Control;
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uint8_t Control2;
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uint8_t Status;
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uint32_t SpriteRamAddr;
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uint16_t VideoRamAddr;
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uint8_t XScroll;
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uint16_t TmpVideoRamAddr;
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bool WriteToggle;
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uint16_t HighBitShift;
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uint16_t LowBitShift;
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};
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struct TileInfo
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{
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uint8_t LowByte;
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uint8_t HighByte;
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uint8_t PaletteOffset;
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bool HorizontalMirror;
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};
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class PPU : public IMemoryHandler
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{
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private:
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static IVideoDevice *VideoDevice;
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MemoryManager *_memoryManager;
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PPUState _state;
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int32_t _scanline = 0;
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uint32_t _cycle = 0;
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uint32_t _frameCount = 0;
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uint64_t _cycleCount = 0;
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uint8_t _memoryReadBuffer = 0;
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uint8_t _paletteRAM[0x100];
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uint8_t _spriteRAM[0x100];
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uint8_t _secondarySpriteRAM[0x20];
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uint8_t *_outputBuffer;
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PPUControlFlags _flags;
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PPUStatusFlags _statusFlags;
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bool _doNotSetVBFlag = false;
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TileInfo _currentTile;
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TileInfo _nextTile;
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TileInfo _previousTile;
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int32_t _spriteX[8];
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TileInfo _spriteTiles[8];
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void UpdateStatusFlag();
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void UpdateFlags();
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bool CheckFlag(PPUControlFlags flag);
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bool IsRenderingEnabled();
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void IncVerticalScrolling();
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void IncHorizontalScrolling();
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uint16_t GetNameTableAddr();
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uint16_t GetAttributeAddr();
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void ProcessPreVBlankScanline();
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void ProcessPrerenderScanline();
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void ProcessVisibleScanline();
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void CopyOAMData();
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void BeginVBlank();
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void EndVBlank();
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uint8_t GetBGPaletteEntry(uint8_t paletteOffset, uint8_t pixel);
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uint8_t GetSpritePaletteEntry(uint8_t paletteOffset, uint8_t pixel);
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uint8_t ReadPaletteRAM(uint16_t addr);
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void WritePaletteRAM(uint16_t addr, uint8_t value);
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void LoadTileInfo();
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void LoadSpriteTileInfo(uint8_t spriteIndex);
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void ShiftTileRegisters();
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void InitializeShiftRegisters();
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void LoadNextTile();
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void DrawPixel();
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void CopyFrame();
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PPURegisters GetRegisterID(uint16_t addr)
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{
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if(addr == 0x4014) {
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return PPURegisters::SpriteDMA;
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} else {
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return (PPURegisters)(addr & 0x07);
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}
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}
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public:
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PPU(MemoryManager *memoryManager);
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~PPU();
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vector<std::array<uint16_t, 2>> GetRAMAddresses()
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{
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return{ { { 0x2000, 0x3FFF } }, { {0x4014, 0x4014 } } };
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}
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uint8_t ReadRAM(uint16_t addr);
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void WriteRAM(uint16_t addr, uint8_t value);
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void Exec();
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static void RegisterVideoDevice(IVideoDevice *videoDevice)
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{
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PPU::VideoDevice = videoDevice;
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}
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uint32_t GetFrameCount()
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{
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return _frameCount;
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}
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};
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