Emu: Convert Emu class to singleton

src/emu.h

@@ -0,0 +1,30 @@
+#pragma once
+
+#include <cstdint>
+#include <vector>
+
+#include "processing-unit.h"
+#include "ruc/singleton.h"
+
+class Emu : ruc::Singleton<Emu> {
+public:
+	Emu(s) {}
+
+	void WriteRAM(int location, int length);
+	void WriteVRAM(int location, int length);
+	void WriteROM(int location, int length);
+
+	void ReadRAM(int location, int length);
+	void ReadVRAM(int location, int length);
+	void ReadROM(int location, int length);
+
+private:
+	float m_frequency;
+	int m_cycle = 0;
+
+	uint8_t m_ram[1024];
+	uint8_t m_vram[1024];
+	uint8_t m_rom[1024];
+
+	std::vector<ProcessingUnit> m_processing_units;
+};