113 lines
No EOL
1.9 KiB
C++
113 lines
No EOL
1.9 KiB
C++
#pragma once
|
|
|
|
#include "stdafx.h"
|
|
#include "MemoryManager.h"
|
|
|
|
enum PPURegisters
|
|
{
|
|
Control = 0x00,
|
|
Control2 = 0x01,
|
|
Status = 0x02,
|
|
SpriteAddr = 0x03,
|
|
SpriteData = 0x04,
|
|
ScrollOffsets = 0x05,
|
|
VideoMemoryAddr = 0x06,
|
|
VideoMemoryData = 0x07
|
|
};
|
|
|
|
struct PPUControlFlags
|
|
{
|
|
uint16_t NameTableAddr;
|
|
bool VerticalWrite;
|
|
uint16_t SpritePatternAddr;
|
|
uint16_t BackgroundPatternAddr;
|
|
bool LargeSprites;
|
|
bool VBlank;
|
|
|
|
bool Grayscale;
|
|
bool BackgroundMask;
|
|
bool SpriteMask;
|
|
bool BackgroundEnabled;
|
|
bool SpritesEnabled;
|
|
bool IntensifyRed;
|
|
bool IntensifyGreen;
|
|
bool IntensifyBlue;
|
|
};
|
|
|
|
struct PPUStatusFlags
|
|
{
|
|
bool SpriteOverflow;
|
|
bool Sprite0Hit;
|
|
bool VerticalBlank;
|
|
};
|
|
|
|
struct PPUState
|
|
{
|
|
uint8_t Control;
|
|
uint8_t Control2;
|
|
uint8_t Status;
|
|
uint8_t SpriteRamAddr;
|
|
uint16_t VideoRamAddr;
|
|
uint8_t XScroll;
|
|
uint16_t TmpVideoRamAddr;
|
|
bool WriteToggle;
|
|
};
|
|
|
|
class PPU : public IMemoryHandler
|
|
{
|
|
private:
|
|
MemoryManager *_memoryManager;
|
|
|
|
PPUState _state;
|
|
uint64_t _cycleCount;
|
|
|
|
uint8_t _memoryReadBuffer;
|
|
uint8_t _spriteRAM[0x100];
|
|
|
|
uint8_t *_outputBuffer;
|
|
|
|
int16_t _scanline = 0;
|
|
uint16_t _cycle = 0;
|
|
uint32_t _frameCount = 0;
|
|
|
|
PPUControlFlags _flags;
|
|
PPUStatusFlags _statusFlags;
|
|
|
|
void UpdateStatusFlag();
|
|
|
|
void UpdateFlags();
|
|
bool CheckFlag(PPUControlFlags flag);
|
|
|
|
bool IsRenderingEnabled();
|
|
|
|
void IncVerticalScrolling();
|
|
void IncHorizontalScrolling();
|
|
uint16_t GetTileAddr();
|
|
uint16_t GetAttributeAddr();
|
|
|
|
void UpdateScrolling();
|
|
void ProcessPrerenderScanline();
|
|
void ProcessVisibleScanline();
|
|
|
|
void BeginVBlank();
|
|
void EndVBlank();
|
|
|
|
PPURegisters GetRegisterID(uint16_t addr)
|
|
{
|
|
return (PPURegisters)(addr & 0x07);
|
|
}
|
|
|
|
public:
|
|
PPU(MemoryManager *memoryManager);
|
|
~PPU();
|
|
|
|
vector<std::array<uint16_t, 2>> GetRAMAddresses()
|
|
{
|
|
return{ { { 0x2000, 0x3FFF } }, { {0x4014, 0x4014 } } };
|
|
}
|
|
|
|
uint8_t ReadRAM(uint16_t addr);
|
|
void WriteRAM(uint16_t addr, uint8_t value);
|
|
|
|
void Exec();
|
|
}; |