added ppu

NES Emulator/ppu.h

@@ -0,0 +1,95 @@
+#ifndef _PPU_H_
+#define _PPU_H_
+
+#include "types.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 ppuScroll;
+	Byte ppuAddr;
+	Byte ppuData;
+	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);
+
+void tickPPU(struct PPU* ppu);
+
+#endif // _PPU_H_