97 lines
No EOL
1.6 KiB
C++
97 lines
No EOL
1.6 KiB
C++
#pragma once
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#include "stdafx.h"
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#include "IMemoryHandler.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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};
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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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uint8_t SpriteRamAddr;
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uint16_t VideoRamAddr;
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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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PPUState _state;
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uint64_t _cycleCount;
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uint8_t _memoryReadBuffer;
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uint8_t _spriteRAM[0x100];
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uint8_t _videoRAM[0x4000];
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uint8_t *_outputBuffer;
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int16_t _scanline = 0;
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uint16_t _cycle = 0;
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uint32_t _frameCount = 0;
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bool _writeLow = false;
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PPUControlFlags _flags;
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PPUStatusFlags _statusFlags;
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void PPU::UpdateStatusFlag();
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void PPU::UpdateFlags();
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bool PPU::CheckFlag(PPUControlFlags flag);
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PPURegisters GetRegisterID(uint16_t addr)
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{
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return (PPURegisters)(addr & 0x07);
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}
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public:
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PPU();
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~PPU();
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std::array<int, 2> GetIOAddresses()
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{
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return std::array<int, 2> {{ 0x2000, 0x3FFF }};
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}
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uint8_t MemoryRead(uint16_t addr);
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void MemoryWrite(uint16_t addr, uint8_t value);
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void Exec();
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}; |