Started on common and core packages.

src/core/CMakeLists.txt

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+cmake_minimum_required(VERSION 2.8.8)
+
+if(WOMBAT_BUILD_TYPE STREQUAL "GBA")
+	set(
+		CPP
+			gba/core.cpp
+			gba/gfx.cpp
+	)
+	include_directories("gba")
+elseif(WOMBAT_BUILD_TYPE STREQUAL "Native")
+endif()
+
+add_library(NostalgiaCore OBJECT ${CPP})
+
+install(
+	FILES
+	DESTINATION
+		include/nostalgia/core
+)

src/core/gba/core.cpp

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+/*
+ * Copyright 2016 gtalent2@gmail.com
+ * 
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+#include "../types.hpp"
+#include "registers.hpp"
+
+namespace nostalgia {
+namespace core {
+
+int init() {
+	return 0;
+}
+
+}
+}

src/core/gba/gfx.cpp

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+/*
+ * Copyright 2016 gtalent2@gmail.com
+ * 
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+#include "registers.hpp"

src/core/gba/registers.hpp

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+/*
+ * Copyright 2016 gtalent2@gmail.com
+ * 
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+#ifndef NOSTALGIA_CORE_GBA_REGISTERS_HPP
+#define NOSTALGIA_CORE_GBA_REGISTERS_HPP
+
+#define REG_DISPCNT *((volatile unsigned int*) 0x04000000)
+
+#endif

src/core/types.hpp

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+/*
+ * Copyright 2016 gtalent2@gmail.com
+ * 
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+#ifndef NOSTALGIA_CORE_TYPES_HPP
+#define NOSTALGIA_CORE_TYPES_HPP
+
+#include <cstdint>
+
+namespace nostalgia {
+namespace core {
+
+typedef char               int8_t;
+typedef unsigned char      uint8_t;
+typedef short              int16_t;
+typedef unsigned short     uint16_t;
+typedef int                int32_t;
+typedef unsigned int       uint32_t;
+typedef unsigned           uint_t;
+typedef long long          int64_t;
+typedef unsigned long long uint64_t;
+
+#ifdef _LP64
+typedef uint64_t size_t;
+#elif _LP32
+typedef uint32_t size_t;
+#endif
+
+}
+}
+
+#endif