109 lines
1.3 KiB
C
109 lines
1.3 KiB
C
#ifndef _PPU_H_
|
|
#define _PPU_H_
|
|
|
|
#include "types.h"
|
|
#include "SDL.h"
|
|
|
|
struct Bus;
|
|
|
|
struct PPU
|
|
{
|
|
// REGISTERS
|
|
union
|
|
{
|
|
struct
|
|
{
|
|
Byte nametable : 2;
|
|
Byte increment : 1;
|
|
Byte spriteTile : 1;
|
|
Byte bgTile : 1;
|
|
Byte spriteHeight : 1;
|
|
Byte master : 1;
|
|
Byte nmiEnable : 1;
|
|
};
|
|
|
|
Byte raw;
|
|
|
|
} ppuCtrl;
|
|
|
|
union
|
|
{
|
|
struct
|
|
{
|
|
Byte greyscale : 1;
|
|
Byte bgLeftColumn : 1;
|
|
Byte spriteLeftColumn : 1;
|
|
Byte bgEnable : 1;
|
|
Byte spriteEnable : 1;
|
|
Byte colorEmphasis : 3;
|
|
};
|
|
|
|
Byte raw;
|
|
|
|
} ppuMask;
|
|
|
|
union
|
|
{
|
|
struct
|
|
{
|
|
Byte padding : 5;
|
|
Byte overflow : 1;
|
|
Byte spriteZeroHit : 1;
|
|
Byte vBlank : 1;
|
|
};
|
|
|
|
Byte raw;
|
|
|
|
} ppuStatus;
|
|
|
|
Byte oamaddr;
|
|
Byte oamdata;
|
|
|
|
Byte scrollX, scrollY;
|
|
Byte scrollWriteTarget;
|
|
|
|
union
|
|
{
|
|
struct
|
|
{
|
|
Byte lo;
|
|
Byte hi;
|
|
};
|
|
|
|
Word raw;
|
|
} ppuAddress;
|
|
Byte ppuAddressWriteTarget;
|
|
|
|
Byte oamdma;
|
|
|
|
Byte* patternTables[2];
|
|
Byte* nametables[4];
|
|
Byte* paletteIndexes;
|
|
|
|
union
|
|
{
|
|
struct
|
|
{
|
|
Byte y;
|
|
Byte tile;
|
|
Byte attr;
|
|
Byte x;
|
|
};
|
|
|
|
DWord raw;
|
|
}* oam;
|
|
|
|
Word x, y;
|
|
|
|
struct Bus* bus;
|
|
};
|
|
|
|
struct PPU* createPPU(struct Bus* parent);
|
|
void destroyPPU(struct PPU* ppu);
|
|
|
|
Byte ppuRead(struct PPU* ppu, Word addr);
|
|
void ppuWrite(struct PPU* ppu, Word addr, Byte val);
|
|
|
|
int tickPPU(struct PPU* ppu);
|
|
|
|
#endif // _PPU_H_
|