added ppu

NES Emulator/ppu.c

@@ -0,0 +1,101 @@
+#include "ppu.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <memory.h>
+#include "bus.h"
+
+struct PPU* createPPU(struct Bus* parent)
+{
+	struct PPU* ppu = (struct PPU*)malloc(sizeof(struct PPU));
+	if (ppu == NULL)
+	{
+		fprintf(stderr, "Failed to allocate memory for PPU object.\n");
+		exit(1);
+	}
+
+	ppu->bus = parent;
+
+	for (int i = 0; i < 2; i++)
+	{
+		ppu->patternTables[i] = (Byte*)malloc(0x1000);
+		if (ppu->patternTables[i] == NULL)
+		{
+			fprintf(stderr, "Failed to allocate memory for PPU pattern table #%d object.\n", i);
+			exit(1);
+		}
+
+		memset(ppu->patternTables[i], 0, 0x1000);
+	}
+
+	for (int i = 0; i < 4; i++)
+	{
+		ppu->nametables[i] = (Byte*)malloc(0x0400);
+		if (ppu->nametables[i] == NULL)
+		{
+			fprintf(stderr, "Failed to allocate memory for PPU nametable #%d object.\n", i);
+			exit(1);
+		}
+
+		memset(ppu->nametables[i], 0, 0x0400);
+	}
+
+	ppu->paletteIndexes = (Byte*)malloc(0x20);
+	if (ppu->paletteIndexes == NULL)
+	{
+		fprintf(stderr, "Failed to allocate memory for PPU palette RAM indexes.\n");
+		exit(1);
+	}
+
+	ppu->oam = (Byte*)malloc(0x100);
+	if (ppu->oam == NULL)
+	{
+		fprintf(stderr, "Failed to allocate memory for PPU OAM.\n");
+		exit(1);
+	}
+
+	ppu->ppuctrl.raw = 0b00000000;
+	ppu->ppumask.raw = 0b00000000;
+	ppu->ppustatus.raw = 0b10100000;
+	ppu->oamaddr = 0x00;
+	ppu->ppuAddr = 0x00;
+	ppu->ppuData = 0x00;
+
+	ppu->x = 0;
+	ppu->y = 0;
+
+	return ppu;
+}
+
+void destroyPPU(struct PPU* ppu)
+{
+	free(ppu->oam);
+	free(ppu->paletteIndexes);
+	free(ppu->nametables);
+	free(ppu->patternTables);
+
+	free(ppu);
+}
+
+Byte ppuRead(struct PPU* ppu, Word addr)
+{
+	return 0x00;
+}
+
+void ppuWrite(struct PPU* ppu, Word addr, Byte val)
+{
+}
+
+void tickPPU(struct PPU* ppu)
+{
+	ppu->x++;
+
+	if (ppu->x == 341)
+	{
+		ppu->x = 0;
+		ppu->y++;
+
+		if (ppu->y == 261)
+			ppu->y = 0;
+	}
+}