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added mappers (not working)

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This commit is contained in:
Lauchmelder 2021-10-28 16:57:37 +02:00
parent 034645154d
commit 9039fa0ccf
14 changed files with 512 additions and 106 deletions
NES Emulator
ppu.h

103
NES Emulator/ppu.h
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@ -6,9 +6,32 @@
struct Bus;
struct Pixel
{
Byte r;
Byte g;
Byte b;
};
struct FIFO16
{
union
{
struct
{
Byte lo;
Byte hi;
};
Word data;
};
};
struct PPU
{
// REGISTERS
////////////////////////////////////////
/// REGISTERS ///
////////////////////////////////////////
union
{
struct
@ -59,6 +82,9 @@ struct PPU
Byte oamaddr;
Byte oamdata;
////////////////////////////////////////
/// PSEUDO REGISTERS ///
////////////////////////////////////////
Byte scrollX, scrollY;
Byte scrollWriteTarget;
@ -76,8 +102,9 @@ struct PPU
Byte oamdma;
Byte* patternTables[2];
SDL_Texture* patternTableTextures[2];
////////////////////////////////////////
/// VRAM ///
////////////////////////////////////////
Byte* nameTables[2];
SDL_Texture* nameTableTextures[2];
@ -85,6 +112,72 @@ struct PPU
Byte* paletteIndexes;
////////////////////////////////////////
/// PHASE TRACKERS ///
////////////////////////////////////////
enum
{
Visible,
PostRender,
VBlank,
PreRender,
VerticalPhaseSize
} verticalPhase;
enum
{
Idle,
Fetching,
SpriteFetching,
NextLineFetching,
Unknown,
HorizontalPhaseSize
} horizontalPhase;
Byte remainingCycles;
enum
{
Nametable,
Attribute,
PatternLow,
PatternHigh,
FetchingPhaseSize
} fetchingPhase;
////////////////////////////////////////
/// TILE DATA ///
////////////////////////////////////////
struct
{
Byte x;
Byte y;
} nametablePos;
Byte tilePosY;
struct
{
Byte nametable;
Byte attribute;
union
{
struct {
Byte lo;
Byte hi;
};
Word raw;
} tile;
} tileData;
struct FIFO16 loPatternFIFO;
struct FIFO16 hiPatternFIFO;
union
{
struct
@ -100,6 +193,8 @@ struct PPU
Word x, y;
struct Pixel* pixels;
SDL_Texture* screen;
struct Bus* bus;
};
@ -111,7 +206,7 @@ void ppuWrite(struct PPU* ppu, Word addr, Byte val);
int tickPPU(struct PPU* ppu);
SDL_Texture* getPatternTableTexture(struct PPU* ppu, int index);
SDL_Texture* getNameTableTexture(struct PPU* ppu, int index);
SDL_Texture* getScreenTexture(struct PPU* ppu);
#endif // _PPU_H_