88 files changed, 3956 insertions, 0 deletions

diff --git a/source/Color.hpp b/source/10-common/Color.hpp
index ef0c5a9..ef0c5a9 100644
--- a/source/Color.hpp
+++ b/source/10-common/Color.hpp
diff --git a/source/10-common/Enum.hpp b/source/10-common/Enum.hpp
new file mode 100644
index 0000000..8ad75ba
--- /dev/null
+++ b/source/10-common/Enum.hpp
@@ -0,0 +1,103 @@
+#pragma once
+
+#include <initializer_list>
+#include <type_traits>
+
+template <class TEnum>
+class EnumFlags {
+public:
+	using Enum = TEnum;
+	using Underlying = std::underlying_type_t<TEnum>;
+
+private:
+	Underlying mValue;
+
+public:
+	EnumFlags()
+		: mValue{ 0 } {
+	}
+
+	EnumFlags(TEnum e)
+		: mValue{ static_cast<Underlying>(1) << static_cast<Underlying>(e) } {
+	}
+
+	bool IsSet(EnumFlags mask) const {
+		return (mValue & mask.mValue) == mask.mValue;
+	}
+
+	bool IsSet(std::initializer_list<TEnum> enums) {
+		EnumFlags flags;
+		for (auto& e : enums) {
+			flags.mValue |= static_cast<Underlying>(e);
+		}
+		return IsSet(flags);
+	}
+
+	bool IsSetExclusive(EnumFlags mask) const {
+		return mValue == mask.mValue;
+	}
+
+	bool IsSetExclusive(std::initializer_list<TEnum> enums) {
+		EnumFlags flags;
+		for (auto& e : enums) {
+			flags.mValue |= static_cast<Underlying>(e);
+		}
+		return IsSetExclusive(flags);
+	}
+
+	void SetOn(EnumFlags mask) {
+		mValue |= mask.mValue;
+	}
+
+	void SetOff(EnumFlags mask) {
+		mValue &= ~mask.mValue;
+	}
+
+	void Set(EnumFlags mask, bool enabled) {
+		if (enabled) {
+			SetOn(mask);
+		} else {
+			SetOff(mask);
+		}
+	}
+
+	EnumFlags& operator|=(EnumFlags that) {
+		mValue |= that.mValue;
+		return *this;
+	}
+
+	EnumFlags& operator&=(EnumFlags that) {
+		mValue &= that.mValue;
+		return *this;
+	}
+
+	EnumFlags& operator^=(EnumFlags that) {
+		mValue ^= that.mValue;
+		return *this;
+	}
+
+	EnumFlags& operator|=(TEnum e) {
+		mValue |= 1 << static_cast<Underlying>(e);
+		return *this;
+	}
+
+	EnumFlags& operator&=(TEnum e) {
+		mValue &= 1 << static_cast<Underlying>(e);
+		return *this;
+	}
+
+	EnumFlags& operator^=(TEnum e) {
+		mValue ^= 1 << static_cast<Underlying>(e);
+		return *this;
+	}
+
+	EnumFlags operator|(EnumFlags that) const { return EnumFlags(mValue | that.mValue); }
+	EnumFlags operator&(EnumFlags that) const { return EnumFlags(mValue & that.mValue); }
+	EnumFlags operator^(EnumFlags that) const { return EnumFlags(mValue ^ that.mValue); }
+
+	EnumFlags operator|(TEnum e) const { return EnumFlags(mValue | 1 << static_cast<Underlying>(e)); }
+	EnumFlags operator&(TEnum e) const { return EnumFlags(mValue & 1 << static_cast<Underlying>(e)); }
+	EnumFlags operator^(TEnum e) const { return EnumFlags(mValue ^ 1 << static_cast<Underlying>(e)); }
+
+	EnumFlags operator~() const { return EnumFlags(~mValue); }
+};
diff --git a/source/10-common/LookupTable.hpp b/source/10-common/LookupTable.hpp
new file mode 100644
index 0000000..c50e28e
--- /dev/null
+++ b/source/10-common/LookupTable.hpp
@@ -0,0 +1,53 @@
+#pragma once
+
+#include <robin_hood.h>
+#include <string_view>
+
+// BIDI stands for bi-directional
+#define BIDI_LUT_DECL(name, aType, aCount, bType, bCount) \
+	int gLut_##name##_A2B[aCount];                        \
+	int gLut_##name##_B2A[bCount];                        \
+	using name##AType = aType;                            \
+	using name##BType = bType;                            \
+	void InitializeLut##name()
+#define BIDI_LUT_MAP_FOR(name)              \
+	int* lutMappingA2B = gLut_##name##_A2B; \
+	int* lutMappingB2A = gLut_##name##_B2A
+#define BIDI_LUT_MAP(from, to) \
+	lutMappingA2B[from] = to;  \
+	lutMappingB2A[to] = from
+#define BIDI_LUT_INIT(name) InitializeLut##name()
+#define BIDI_LUT_A2B_LOOKUP(name, from) (name##BType)(gLut_##name##_A2B[from])
+#define BIDI_LUT_B2A_LOOKUP(name, to) (name##AType)(gLut_##name##_B2A[to])
+
+#define STR_LUT_DECL(name, enumMinValue, enumMaxValue)              \
+	constexpr int kLutMinVal_##name = enumMinValue;                 \
+	const char* gLut_##name[(int)enumMaxValue - (int)enumMinValue]; \
+	void InitializeLut##name()
+#define STR_LUT_MAP_FOR(name)              \
+	const char** lutMapping = gLut_##name; \
+	int lutMappingMinValue = kLutMinVal_##name
+#define STR_LUT_MAP(value, text) lutMapping[value - lutMappingMinValue] = text
+#define STR_LUT_MAP_ENUM(enumValue) STR_LUT_MAP(enumValue, #enumValue)
+#define STR_LUT_LOOKUP(name, enumValue) gLut_##name[enumValue - kLutMinVal_##name]
+#define STR_LUT_INIT(name) InitializeLut##name()
+
+// BSTR stands for bi-directional string
+#define BSTR_LUT_DECL(name, enumMinValue, enumMaxValue)                                         \
+	constexpr int kLutMinVal_##name = enumMinValue;                                             \
+	const char* gLut_##name##_V2S[(int)enumMaxValue - (int)enumMinValue];                       \
+	robin_hood::unordered_flat_map<std::string_view, decltype(enumMaxValue)> gLut_##name##_S2V; \
+	void InitializeLut##name()
+#define BSTR_LUT_MAP_FOR(name)                      \
+	const char** lutMappingV2S = gLut_##name##_V2S; \
+	auto& lutMappingS2V = gLut_##name##_S2V;        \
+	int lutMappingMinValue = kLutMinVal_##name
+#define BSTR_LUT_MAP(value, text)                     \
+	lutMappingV2S[value - lutMappingMinValue] = text; \
+	lutMappingS2V.insert_or_assign(std::string_view(text), value);
+#define BSTR_LUT_MAP_ENUM(enumValue) BSTR_LUT_MAP(enumValue, #enumValue)
+#define BSTR_LUT_V2S(name) gLut_##name##_V2S
+#define BSTR_LUT_S2V(name) gLut_##name##_S2V
+#define BSTR_LUT_V2S_LOOKUP(name, enumValue) gLut_##name##_V2S[enumValue - kLutMinVal_##name]
+#define BSTR_LUT_S2V_LOOKUP(name, string) gLut_##name##_S2V.find(std::string_view(text))
+#define BSTR_LUT_INIT(name) InitializeLut##name()
diff --git a/source/10-common/Macros.hpp b/source/10-common/Macros.hpp
new file mode 100644
index 0000000..a255ada
--- /dev/null
+++ b/source/10-common/Macros.hpp
@@ -0,0 +1,31 @@
+#pragma once
+
+#define STRINGIFY_IMPL(text) #text
+#define STRINGIFY(text) STRINGIFY_IMPL(text)
+
+#define CONCAT_IMPL(a, b) a##b
+#define CONCAT(a, b) CONCAT_IMPL(a, b)
+#define CONCAT_3(a, b, c) CONCAT(a, CONCAT(b, c))
+#define CONCAT_4(a, b, c, d) CONCAT(CONCAT(a, b), CONCAT(c, d))
+
+#define UNIQUE_NAME(prefix) CONCAT(prefix, __COUNTER__)
+#define UNIQUE_NAME_LINE(prefix) CONCAT(prefix, __LINE__)
+#define DISCARD UNIQUE_NAME(_discard)
+
+#define UNUSED(x) (void)x;
+
+#define PRINTF_STRING_VIEW(s) (int)s.size(), s.data()
+
+#if defined(_MSC_VER)
+#	define UNREACHABLE __assume(0)
+#elif defined(__GNUC__) || defined(__clang__)
+#	define UNREACHABLE __builtin_unreachable()
+#else
+#	define UNREACHABLE
+#endif
+
+#if _WIN32
+#	define PLATFORM_PATH_STR "%ls"
+#else
+#	define PLATFORM_PATH_STR "%s"
+#endif
diff --git a/source/10-common/PodVector.hpp b/source/10-common/PodVector.hpp
new file mode 100644
index 0000000..74e99d6
--- /dev/null
+++ b/source/10-common/PodVector.hpp
@@ -0,0 +1,297 @@
+// File adapted from dear-imgui's ImVector, implemented in https://github.com/ocornut/imgUI/blob/master/imgui.h
+#pragma once
+
+#include <cassert>
+#include <cstddef>
+#include <cstdint>
+#include <cstdlib>
+#include <cstring>
+#include <span>
+
+template <class T>
+class PodVector {
+public:
+	using value_type = T;
+	using iterator = value_type*;
+	using const_iterator = const value_type*;
+
+private:
+	int mSize;
+	int mCapacity;
+	T* mData;
+
+public:
+	PodVector() {
+		mSize = mCapacity = 0;
+		mData = nullptr;
+	}
+
+	PodVector(const PodVector<T>& src) {
+		mSize = mCapacity = 0;
+		mData = nullptr;
+		operator=(src);
+	}
+
+	PodVector<T>& operator=(const PodVector<T>& src) {
+		clear();
+		resize(src.mSize);
+		std::memcpy(mData, src.mData, (size_t)mSize * sizeof(T));
+		return *this;
+	}
+
+	PodVector(PodVector&& src) {
+		mSize = src.mSize;
+		mCapacity = src.mCapacity;
+		mData = src.mData;
+
+		src.mSize = src.mCapacity = 0;
+		src.mData = nullptr;
+	}
+
+	PodVector& operator=(PodVector&& src) {
+		if (this != &src) {
+			std::free(mData);
+
+			mSize = src.mSize;
+			mCapacity = src.mCapacity;
+			mData = src.mData;
+
+			src.mSize = src.mCapacity = 0;
+			src.mData = nullptr;
+		}
+		return *this;
+	}
+
+	~PodVector() {
+		std::free(mData);
+	}
+
+	bool empty() const { return mSize == 0; }
+	int size() const { return mSize; }
+	int size_in_bytes() const { return mSize * (int)sizeof(T); }
+	int max_size() const { return 0x7FFFFFFF / (int)sizeof(T); }
+	int capacity() const { return mCapacity; }
+
+	T& operator[](int i) {
+		assert(i >= 0 && i < mSize);
+		return mData[i];
+	}
+
+	const T& operator[](int i) const {
+		assert(i >= 0 && i < mSize);
+		return mData[i];
+	}
+
+	void clear() {
+		if (mData) {
+			mSize = mCapacity = 0;
+			std::free(mData);
+			mData = nullptr;
+		}
+	}
+
+	T* begin() { return mData; }
+	const T* begin() const { return mData; }
+	T* end() { return mData + mSize; }
+	const T* end() const { return mData + mSize; }
+
+	T* data() { return mData; }
+
+	T& front() {
+		assert(mSize > 0);
+		return mData[0];
+	}
+
+	const T& front() const {
+		assert(mSize > 0);
+		return mData[0];
+	}
+
+	T& back() {
+		assert(mSize > 0);
+		return mData[mSize - 1];
+	}
+
+	const T& back() const {
+		assert(mSize > 0);
+		return mData[mSize - 1];
+	}
+
+	void swap(PodVector<T>& rhs) {
+		int rhs_size = rhs.mSize;
+		rhs.mSize = mSize;
+		mSize = rhs_size;
+		int rhs_cap = rhs.mCapacity;
+		rhs.mCapacity = mCapacity;
+		mCapacity = rhs_cap;
+		T* rhs_mDataTmp = rhs.mData;
+		rhs.mData = mData;
+		mData = rhs_mDataTmp;
+	}
+
+	int grow_capacity(int sz) const {
+		int newCapacity = mCapacity ? (mCapacity + mCapacity / 2) : 8;
+		return newCapacity > sz ? newCapacity : sz;
+	}
+
+	void resize(int new_size) {
+		if (new_size > mCapacity) reserve(grow_capacity(new_size));
+		mSize = new_size;
+	}
+
+	void resize_more(int size) {
+		resize(mSize + size);
+	}
+
+	void resize(int new_size, const T& v) {
+		if (new_size > mCapacity) reserve(grow_capacity(new_size));
+		if (new_size > mSize) {
+			for (int n = mSize; n < new_size; n++) {
+				std::memcpy(&mData[n], &v, sizeof(v));
+			}
+		}
+		mSize = new_size;
+	}
+
+	void resize_more(int size, const T& v) {
+		resize(mSize + size, v);
+	}
+
+	void shrink(int new_size) {
+		assert(new_size <= mSize);
+		mSize = new_size;
+	}
+
+	/// Resize a vector to a smaller mSize, guaranteed not to cause a reallocation
+	void reserve(int newCapacity) {
+		if (newCapacity <= mCapacity) return;
+		auto tmp = (T*)std::malloc((size_t)newCapacity * sizeof(T));
+		if (mData) {
+			std::memcpy(tmp, mData, (size_t)mSize * sizeof(T));
+			std::free(mData);
+		}
+		mData = tmp;
+		mCapacity = newCapacity;
+	}
+
+	void reserve_more(int size) {
+		reserve(mSize + size);
+	}
+
+	/// NB: It is illegal to call push_back/push_front/insert with a reference pointing inside the PodVector data itself! e.g. v.push_back(v[10]) is forbidden.
+	void push_back(const T& v) {
+		if (mSize == mCapacity) reserve(grow_capacity(mSize + 1));
+		std::memcpy(&mData[mSize], &v, sizeof(v));
+		mSize++;
+	}
+
+	void pop_back() {
+		assert(mSize > 0);
+		mSize--;
+	}
+
+	void push_front(const T& v) {
+		if (mSize == 0) {
+			push_back(v);
+		} else {
+			insert(mData, v);
+		}
+	}
+
+	T* erase(const T* it) {
+		assert(it >= mData && it < mData + mSize);
+		const ptrdiff_t off = it - mData;
+		std::memmove(mData + off, mData + off + 1, ((size_t)mSize - (size_t)off - 1) * sizeof(T));
+		mSize--;
+		return mData + off;
+	}
+
+	T* erase(const T* it, const T* it_last) {
+		assert(it >= mData && it < mData + mSize && it_last > it && it_last <= mData + mSize);
+		const ptrdiff_t count = it_last - it;
+		const ptrdiff_t off = it - mData;
+		std::memmove(mData + off, mData + off + count, ((size_t)mSize - (size_t)off - count) * sizeof(T));
+		mSize -= (int)count;
+		return mData + off;
+	}
+
+	T* erase_unsorted(const T* it) {
+		assert(it >= mData && it < mData + mSize);
+		const ptrdiff_t off = it - mData;
+		if (it < mData + mSize - 1) std::memcpy(mData + off, mData + mSize - 1, sizeof(T));
+		mSize--;
+		return mData + off;
+	}
+
+	T* insert(const T* it, const T& v) {
+		assert(it >= mData && it <= mData + mSize);
+		const ptrdiff_t off = it - mData;
+		if (mSize == mCapacity) reserve(grow_capacity(mSize + 1));
+		if (off < (int)mSize) std::memmove(mData + off + 1, mData + off, ((size_t)mSize - (size_t)off) * sizeof(T));
+		std::memcpy(&mData[off], &v, sizeof(v));
+		mSize++;
+		return mData + off;
+	}
+
+	bool contains(const T& v) const {
+		const T* data = mData;
+		const T* dataEnd = mData + mSize;
+		while (data < dataEnd) {
+			if (*data++ == v) return true;
+		}
+		return false;
+	}
+
+	T* find(const T& v) {
+		T* data = mData;
+		const T* dataEnd = mData + mSize;
+		while (data < dataEnd)
+			if (*data == v)
+				break;
+			else
+				++data;
+		return data;
+	}
+
+	const T* find(const T& v) const {
+		const T* data = mData;
+		const T* dataEnd = mData + mSize;
+		while (data < dataEnd)
+			if (*data == v)
+				break;
+			else
+				++data;
+		return data;
+	}
+
+	bool find_erase(const T& v) {
+		const T* it = find(v);
+		if (it < mData + mSize) {
+			erase(it);
+			return true;
+		}
+		return false;
+	}
+
+	bool find_erase_unsorted(const T& v) {
+		const T* it = find(v);
+		if (it < mData + mSize) {
+			erase_unsorted(it);
+			return true;
+		}
+		return false;
+	}
+
+	int index_from_ptr(const T* it) const {
+		assert(it >= mData && it < mData + mSize);
+		const ptrdiff_t off = it - mData;
+		return (int)off;
+	}
+
+	// Custom utility functions
+
+	std::span<T> as_span() { return { mData, (size_t)mSize }; }
+	std::span<uint8_t> as_data_span() { return { (uint8_t*)mData, (size_t)mSize * sizeof(T) }; }
+	std::span<const T> as_span() const { return { mData, (size_t)mSize }; }
+	std::span<const uint8_t> as_data_span() const { return { (uint8_t*)mData, (size_t)mSize * sizeof(T) }; }
+};
diff --git a/source/10-common/RapidJsonHelper.hpp b/source/10-common/RapidJsonHelper.hpp
new file mode 100644
index 0000000..75cd93a
--- /dev/null
+++ b/source/10-common/RapidJsonHelper.hpp
@@ -0,0 +1,110 @@
+#pragma once
+
+#include <rapidjson/document.h>
+#include <cstring>
+#include <string>
+#include <string_view>
+
+#define BRUSSEL_JSON_GET(object, name, type, out, failAction) \
+	{                                                         \
+		auto it = (object).FindMember(name);                  \
+		if (it == (object).MemberEnd()) failAction;           \
+		auto& value = it->value;                              \
+		if (!value.Is<type>()) failAction;                    \
+		(out) = value.Get<type>();                            \
+	}
+
+#define BRUSSEL_JSON_GET_DEFAULT(object, name, type, out, theDefault) \
+	do {                                                              \
+		auto it = (object).FindMember(name);                          \
+		if (it == (object).MemberEnd()) {                             \
+			(out) = theDefault;                                       \
+			break;                                                    \
+		}                                                             \
+		auto& value = it->value;                                      \
+		if (!value.Is<type>()) {                                      \
+			(out) = theDefault;                                       \
+			break;                                                    \
+		}                                                             \
+		(out) = value.Get<type>();                                    \
+	} while (0);
+
+namespace rapidjson {
+
+inline const Value* GetProperty(const Value& value, std::string_view name) {
+	for (auto it = value.MemberBegin(); it != value.MemberEnd(); ++it) {
+		if (it->name.GetStringLength() != name.size()) continue;
+		if (std::memcmp(it->name.GetString(), name.data(), name.size())) continue;
+
+		return &it->value;
+	}
+	return nullptr;
+}
+
+inline const Value* GetProperty(const Value& value, Type type, std::string_view name) {
+	for (auto it = value.MemberBegin(); it != value.MemberEnd(); ++it) {
+		if (it->name.GetStringLength() != name.size()) continue;
+		if (it->value.GetType() != type) continue;
+		if (std::memcmp(it->name.GetString(), name.data(), name.size())) continue;
+
+		return &it->value;
+	}
+	return nullptr;
+}
+
+inline std::string_view AsStringView(const Value& value) {
+	return std::string_view(value.GetString(), value.GetStringLength());
+}
+
+inline std::string_view AsStringView(const GenericStringRef<char>& strRef) {
+	return std::string_view(strRef.s, strRef.length);
+}
+
+inline std::string AsString(const Value& value) {
+	return std::string(value.GetString(), value.GetStringLength());
+}
+
+inline std::string AsString(const GenericStringRef<char>& strRef) {
+	return std::string(strRef.s, strRef.length);
+}
+
+// RapidJson itself already provides std::string and const char* overloads
+inline GenericStringRef<char> StringRef(std::string_view str) {
+	return GenericStringRef<char>(
+		str.data() ? str.data() : "",
+		str.size());
+}
+
+template <class TIter, class TSentienl>
+rapidjson::Value WriteVectorPrimitives(rapidjson::Document& root, TIter begin, TSentienl end) {
+	using TElement = typename TIter::value_type;
+
+	rapidjson::Value list;
+	while (begin != end) {
+		if constexpr (std::is_same_v<TElement, std::string>) {
+			auto& elm = *begin;
+			list.PushBack(rapidjson::Value(elm.c_str(), elm.size()), root.GetAllocator());
+		} else {
+			list.PushBack(*begin, root.GetAllocator());
+		}
+		++begin;
+	}
+	return list;
+}
+
+template <class TContainer>
+bool ReadVectorPrimitives(const rapidjson::Value& value, TContainer& list) {
+	using TElement = typename TContainer::value_type;
+
+	if (!value.IsArray()) return false;
+
+	list.reserve(value.Size());
+	for (auto& elm : value.GetArray()) {
+		if (!elm.Is<TElement>()) return {};
+		list.push_back(elm.Get<TElement>());
+	}
+
+	return true;
+}
+
+} // namespace rapidjson
diff --git a/source/10-common/RcPtr.hpp b/source/10-common/RcPtr.hpp
new file mode 100644
index 0000000..130b2b2
--- /dev/null
+++ b/source/10-common/RcPtr.hpp
@@ -0,0 +1,120 @@
+#pragma once
+
+#include "Macros.hpp"
+#include "TypeTraits.hpp"
+
+#include <cstddef>
+#include <cstdint>
+#include <optional>
+#include <type_traits>
+
+class RefCounted {
+public:
+	// DO NOT MODIFY this field, unless explicitly documented the use
+	uint32_t refCount = 0;
+	uint32_t weakCount = 0; // TODO implement
+};
+
+template <class T, class TDeleter = DefaultDeleter<T>>
+class RcPtr : TDeleter {
+private:
+	static_assert(std::is_base_of_v<RefCounted, T>);
+	T* mPtr;
+
+public:
+	RcPtr()
+		: mPtr{ nullptr } {
+	}
+
+	explicit RcPtr(T* ptr)
+		: mPtr{ ptr } {
+		if (ptr) {
+			++ptr->RefCounted::refCount;
+		}
+	}
+
+	~RcPtr() {
+		CleanUp();
+	}
+
+	void Attach(T* ptr) {
+		CleanUp();
+		mPtr = ptr;
+		if (ptr) {
+			++ptr->RefCounted::refCount;
+		}
+	}
+
+	void Detatch() {
+		CleanUp();
+		mPtr = nullptr;
+	}
+
+	RcPtr(const RcPtr& that)
+		: mPtr{ that.mPtr } {
+		if (mPtr) {
+			++mPtr->RefCounted::refCount;
+		}
+	}
+
+	RcPtr& operator=(const RcPtr& that) {
+		CleanUp();
+		mPtr = that.mPtr;
+		if (mPtr) {
+			++mPtr->RefCounted::refCount;
+		}
+		return *this;
+	}
+
+	RcPtr(RcPtr&& that)
+		: mPtr{ that.mPtr } {
+		that.mPtr = nullptr;
+	}
+
+	RcPtr& operator=(RcPtr&& that) {
+		CleanUp();
+		mPtr = that.mPtr;
+		that.mPtr = nullptr;
+		return *this;
+	}
+
+	template <class TBase>
+	requires std::is_base_of_v<TBase, T>
+	operator RcPtr<TBase>() const {
+		return RcPtr<TBase>(mPtr);
+	}
+
+	bool operator==(std::nullptr_t ptr) const {
+		return mPtr == nullptr;
+	}
+
+	bool operator==(const T* ptr) const {
+		return mPtr == ptr;
+	}
+
+	bool operator==(T* ptr) const {
+		return mPtr == ptr;
+	}
+
+	template <class TThat>
+	bool operator==(const RcPtr<TThat>& ptr) const {
+		return mPtr == ptr.Get();
+	}
+
+	T* Get() const {
+		return mPtr;
+	}
+
+	T& operator*() const { return *mPtr; }
+	T* operator->() const { return mPtr; }
+
+private:
+	void CleanUp() {
+		if (mPtr) {
+			--mPtr->RefCounted::refCount;
+			if (mPtr->RefCounted::refCount == 0) {
+				TDeleter::operator()(mPtr);
+			}
+		}
+	}
+};
diff --git a/source/10-common/Rect.hpp b/source/10-common/Rect.hpp
new file mode 100644
index 0000000..89d9b01
--- /dev/null
+++ b/source/10-common/Rect.hpp
@@ -0,0 +1,164 @@
+#pragma once
+
+#include <glm/glm.hpp>
+
+/// Rect is a rectangle representation based on a point and a dimensions, in television coordinate space
+/// (x increases from left to right, y increases from top to bottom).
+template <class T>
+class Rect {
+public:
+	using ScalarType = T;
+	using VectorType = glm::vec<2, T>;
+
+public:
+	T x;
+	T y;
+	T width;
+	T height;
+
+public:
+	Rect()
+		: x{ 0 }, y{ 0 }, width{ 0 }, height{ 0 } {
+	}
+
+	Rect(T x, T y, T width, T height)
+		: x{ x }, y{ y }, width{ width }, height{ height } {
+	}
+
+	Rect(VectorType pos, VectorType size)
+		: x{ pos.x }
+		, y{ pos.y }
+		, width{ size.x }
+		, height{ size.y } {
+	}
+
+	T x0() const { return x; }
+	T y0() const { return y; }
+	T x1() const { return x + width; }
+	T y1() const { return y + height; }
+
+	VectorType TopLeft() const {
+		return VectorType{ x, y };
+	}
+
+	VectorType TopRight() const {
+		return VectorType{ x + width, y };
+	}
+
+	VectorType BottomLeft() const {
+		return VectorType{ x, y + height };
+	}
+
+	VectorType BottomRight() const {
+		return VectorType{ x + width, y + height };
+	}
+
+	VectorType Center() const {
+		return TopLeft() + VectorType{ width / 2, height / 2 };
+	}
+
+	VectorType Dimensions() const {
+		return VectorType{ width, height };
+	}
+
+	VectorType Extents() const {
+		return VectorType{ width / 2, height / 2 };
+	}
+
+	/// Assumes `bySize * 2` is smaller than both `width` and `height` (does not produce a negative-dimension rectangle).
+	Rect Shrink(T bySize) const {
+		T two = bySize * 2;
+		return Rect{ x + bySize, y + bySize, width - two, height - two };
+	}
+
+	Rect Shrink(T left, T top, T right, T bottom) const {
+		return Rect{
+			x + left,
+			y + top,
+			width - left - right,
+			height - top - bottom,
+		};
+	}
+
+	Rect Expand(T bySize) const {
+		T two = bySize * 2;
+		return Rect{ x - bySize, y - bySize, width + two, height + two };
+	}
+
+	Rect Expand(T left, T top, T right, T bottom) const {
+		return Rect{
+			x - left,
+			y - top,
+			width + left + right,
+			height + top + bottom,
+		};
+	}
+
+	bool Contains(VectorType point) const {
+		return point.x >= x &&
+			point.y >= y &&
+			point.x < x + width &&
+			point.y < y + height;
+	}
+
+	bool Intersects(const Rect& that) const {
+		bool xBetween = x > that.x0() && x < that.x1();
+		bool yBetween = y > that.y0() && y < that.y1();
+		return xBetween && yBetween;
+	}
+
+	// Write min()/max() tenary by hand so that we don't have to include <algorithm>
+	// This file is practically going to be included in every file in this project
+
+	static Rect Intersection(const Rect& a, const Rect& b) {
+		auto x0 = a.x0() > b.x0() ? a.x0() : b.x0(); // Max
+		auto y0 = a.y0() > b.y0() ? a.y0() : b.y0(); // Max
+		auto x1 = a.x1() < b.x1() ? a.x1() : b.x1(); // Min
+		auto y1 = a.y1() < b.y1() ? a.y1() : b.y1(); // Min
+		auto width = x1 - x0;
+		auto height = y1 - x0;
+		return Rect{ x0, y0, width, height };
+	}
+
+	static Rect Union(const Rect& a, const Rect& b) {
+		auto x0 = a.x0() < b.x0() ? a.x0() : b.x0(); // Min
+		auto y0 = a.y0() < b.y0() ? a.y0() : b.y0(); // Min
+		auto x1 = a.x1() > b.x1() ? a.x1() : b.x1(); // Max
+		auto y1 = a.y1() > b.y1() ? a.y1() : b.y1(); // Max
+		auto width = x1 - x0;
+		auto height = y1 - x0;
+		return Rect{ x0, y0, width, height };
+	}
+
+	friend bool operator==(const Rect<T>&, const Rect<T>&) = default;
+
+	Rect operator+(glm::vec<2, T> offset) const {
+		return { x + offset.x, y + offset.y, width, height };
+	}
+
+	Rect operator-(glm::vec<2, T> offset) const {
+		return { x - offset.x, y - offset.y, width, height };
+	}
+
+	Rect& operator+=(glm::vec<2, T> offset) {
+		x += offset.x;
+		y += offset.y;
+		return *this;
+	}
+
+	Rect& operator-=(glm::vec<2, T> offset) {
+		x -= offset.x;
+		y -= offset.y;
+		return *this;
+	}
+
+	template <class TTarget>
+	Rect<TTarget> Cast() const {
+		return {
+			static_cast<TTarget>(x),
+			static_cast<TTarget>(y),
+			static_cast<TTarget>(width),
+			static_cast<TTarget>(height),
+		};
+	}
+};
diff --git a/source/10-common/ScopeGuard.hpp b/source/10-common/ScopeGuard.hpp
new file mode 100644
index 0000000..28f3385
--- /dev/null
+++ b/source/10-common/ScopeGuard.hpp
@@ -0,0 +1,60 @@
+#pragma once
+
+#include "Macros.hpp"
+
+#include <utility>
+
+template <class TCleanupFunc>
+class ScopeGuard {
+private:
+	TCleanupFunc mFunc;
+	bool mDismissed = false;
+
+public:
+	/// Specifically left this implicit so that constructs like
+	/// \code
+	/// ScopeGuard sg = [&]() { res.Cleanup(); };
+	/// \endcode
+	/// would work. It is highly discourage and unlikely that one would want to use ScopeGuard as a function
+	/// parameter, so the normal argument that implicit conversion are harmful doesn't really apply here.
+	// Deliberately not explicit to allow usages like: ScopeGuard var = lambda;
+	ScopeGuard(TCleanupFunc&& function) noexcept
+		: mFunc{ std::move(function) } {
+	}
+
+	~ScopeGuard() noexcept {
+		if (!mDismissed) {
+			mFunc();
+		}
+	}
+
+	ScopeGuard(const ScopeGuard&) = delete;
+	ScopeGuard& operator=(const ScopeGuard&) = delete;
+
+	ScopeGuard(ScopeGuard&& that) noexcept
+		: mFunc{ std::move(that.mFunc) } {
+		that.Cancel();
+	}
+
+	ScopeGuard& operator=(ScopeGuard&& that) noexcept {
+		if (!mDismissed) {
+			mFunc();
+		}
+		this->mFunc = std::move(that.mFunc);
+		this->cancelled = std::exchange(that.cancelled, true);
+	}
+
+	void Dismiss() noexcept {
+		mDismissed = true;
+	}
+};
+
+template <class T>
+auto GuardDeletion(T* ptr) {
+	return ScopeGuard([ptr]() {
+		delete ptr;
+	});
+}
+
+#define SCOPE_GUARD(name) ScopeGuard name = [&]()
+#define DEFER ScopeGuard UNIQUE_NAME(scopeGuard) = [&]()
diff --git a/source/10-common/SmallVector.cpp b/source/10-common/SmallVector.cpp
new file mode 100644
index 0000000..c38e8a7
--- /dev/null
+++ b/source/10-common/SmallVector.cpp
@@ -0,0 +1,145 @@
+// Obtained from https://github.com/llvm/llvm-project/blob/main/llvm/lib/Support/SmallVector.cpp
+// commit 4b82bb6d82f65f98f23d0e4c2cd5297dc162864c
+// adapted in code style and utilities to fix this project
+
+//===- llvm/ADT/SmallVector.cpp - 'Normally small' vectors ----------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the SmallVector class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "SmallVector.hpp"
+
+#include <cstdlib>
+#include <stdexcept>
+#include <string>
+
+// Check that no bytes are wasted and everything is well-aligned.
+namespace {
+// These structures may cause binary compat warnings on AIX. Suppress the
+// warning since we are only using these types for the static assertions below.
+#if defined(_AIX)
+#	pragma GCC diagnostic push
+#	pragma GCC diagnostic ignored "-Waix-compat"
+#endif
+struct Struct16B {
+	alignas(16) void* X;
+};
+struct Struct32B {
+	alignas(32) void* X;
+};
+#if defined(_AIX)
+#	pragma GCC diagnostic pop
+#endif
+} // namespace
+static_assert(sizeof(SmallVector<void*, 0>) ==
+		sizeof(unsigned) * 2 + sizeof(void*),
+	"wasted space in SmallVector size 0");
+static_assert(alignof(SmallVector<Struct16B, 0>) >= alignof(Struct16B),
+	"wrong alignment for 16-byte aligned T");
+static_assert(alignof(SmallVector<Struct32B, 0>) >= alignof(Struct32B),
+	"wrong alignment for 32-byte aligned T");
+static_assert(sizeof(SmallVector<Struct16B, 0>) >= alignof(Struct16B),
+	"missing padding for 16-byte aligned T");
+static_assert(sizeof(SmallVector<Struct32B, 0>) >= alignof(Struct32B),
+	"missing padding for 32-byte aligned T");
+static_assert(sizeof(SmallVector<void*, 1>) ==
+		sizeof(unsigned) * 2 + sizeof(void*) * 2,
+	"wasted space in SmallVector size 1");
+
+static_assert(sizeof(SmallVector<char, 0>) ==
+		sizeof(void*) * 2 + sizeof(void*),
+	"1 byte elements have word-sized type for size and capacity");
+
+/// Report that MinSize doesn't fit into this vector's size type. Throws
+/// std::length_error or calls report_fatal_error.
+[[noreturn]] static void report_size_overflow(size_t MinSize, size_t MaxSize);
+static void report_size_overflow(size_t MinSize, size_t MaxSize) {
+	std::string Reason = "SmallVector unable to grow. Requested capacity (" +
+		std::to_string(MinSize) +
+		") is larger than maximum value for size type (" +
+		std::to_string(MaxSize) + ")";
+	throw std::length_error(Reason);
+}
+
+/// Report that this vector is already at maximum capacity. Throws
+/// std::length_error or calls report_fatal_error.
+[[noreturn]] static void report_at_maximum_capacity(size_t MaxSize);
+static void report_at_maximum_capacity(size_t MaxSize) {
+	std::string Reason =
+		"SmallVector capacity unable to grow. Already at maximum size " +
+		std::to_string(MaxSize);
+	throw std::length_error(Reason);
+}
+
+// Note: Moving this function into the header may cause performance regression.
+template <class Size_T>
+static size_t getNewCapacity(size_t MinSize, size_t TSize, size_t OldCapacity) {
+	constexpr size_t MaxSize = std::numeric_limits<Size_T>::max();
+
+	// Ensure we can fit the new capacity.
+	// This is only going to be applicable when the capacity is 32 bit.
+	if (MinSize > MaxSize)
+		report_size_overflow(MinSize, MaxSize);
+
+	// Ensure we can meet the guarantee of space for at least one more element.
+	// The above check alone will not catch the case where grow is called with a
+	// default MinSize of 0, but the current capacity cannot be increased.
+	// This is only going to be applicable when the capacity is 32 bit.
+	if (OldCapacity == MaxSize)
+		report_at_maximum_capacity(MaxSize);
+
+	// In theory 2*capacity can overflow if the capacity is 64 bit, but the
+	// original capacity would never be large enough for this to be a problem.
+	size_t NewCapacity = 2 * OldCapacity + 1; // Always grow.
+	return std::min(std::max(NewCapacity, MinSize), MaxSize);
+}
+
+// Note: Moving this function into the header may cause performance regression.
+template <class Size_T>
+void* SmallVectorBase<Size_T>::mallocForGrow(size_t MinSize, size_t TSize, size_t& NewCapacity) {
+	NewCapacity = getNewCapacity<Size_T>(MinSize, TSize, this->capacity());
+	return malloc(NewCapacity * TSize);
+}
+
+// Note: Moving this function into the header may cause performance regression.
+template <class Size_T>
+void SmallVectorBase<Size_T>::grow_pod(void* FirstEl, size_t MinSize, size_t TSize) {
+	size_t NewCapacity = getNewCapacity<Size_T>(MinSize, TSize, this->capacity());
+	void* NewElts;
+	if (BeginX == FirstEl) {
+		NewElts = malloc(NewCapacity * TSize);
+
+		// Copy the elements over.  No need to run dtors on PODs.
+		memcpy(NewElts, this->BeginX, size() * TSize);
+	} else {
+		// If this wasn't grown from the inline copy, grow the allocated space.
+		NewElts = realloc(this->BeginX, NewCapacity * TSize);
+	}
+
+	this->BeginX = NewElts;
+	this->Capacity = NewCapacity;
+}
+
+template class SmallVectorBase<uint32_t>;
+
+// Disable the uint64_t instantiation for 32-bit builds.
+// Both uint32_t and uint64_t instantiations are needed for 64-bit builds.
+// This instantiation will never be used in 32-bit builds, and will cause
+// warnings when sizeof(Size_T) > sizeof(size_t).
+#if SIZE_MAX > UINT32_MAX
+template class SmallVectorBase<uint64_t>;
+
+// Assertions to ensure this #if stays in sync with SmallVectorSizeType.
+static_assert(sizeof(SmallVectorSizeType<char>) == sizeof(uint64_t),
+	"Expected SmallVectorBase<uint64_t> variant to be in use.");
+#else
+static_assert(sizeof(SmallVectorSizeType<char>) == sizeof(uint32_t),
+	"Expected SmallVectorBase<uint32_t> variant to be in use.");
+#endif
diff --git a/source/10-common/SmallVector.hpp b/source/10-common/SmallVector.hpp
new file mode 100644
index 0000000..e33a25d
--- /dev/null
+++ b/source/10-common/SmallVector.hpp
@@ -0,0 +1,1332 @@
+// Obtained from https://github.com/llvm/llvm-project/blob/main/llvm/include/llvm/ADT/SmallVector.h
+// commit 4b82bb6d82f65f98f23d0e4c2cd5297dc162864c
+// adapted in code style and utilities to fix this project
+
+//===- llvm/ADT/SmallVector.h - 'Normally small' vectors --------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file defines the SmallVector class.
+///
+//===----------------------------------------------------------------------===//
+
+#pragma once
+
+#include <algorithm>
+#include <cassert>
+#include <cstddef>
+#include <cstdlib>
+#include <cstring>
+#include <functional>
+#include <initializer_list>
+#include <iterator>
+#include <limits>
+#include <memory>
+#include <new>
+#include <type_traits>
+#include <utility>
+
+#ifdef _MSC_VER
+#	pragma warning(push)
+#	pragma warning(disable : 4267) // The compiler detected a conversion from size_t to a smaller type.
+#endif
+
+#if __has_builtin(__builtin_expect) || defined(__GNUC__)
+#	define LLVM_LIKELY(EXPR) __builtin_expect((bool)(EXPR), true)
+#	define LLVM_UNLIKELY(EXPR) __builtin_expect((bool)(EXPR), false)
+#else
+#	define LLVM_LIKELY(EXPR) (EXPR)
+#	define LLVM_UNLIKELY(EXPR) (EXPR)
+#endif
+
+template <typename IteratorT>
+class iterator_range;
+
+/// This is all the stuff common to all SmallVectors.
+///
+/// The template parameter specifies the type which should be used to hold the
+/// Size and Capacity of the SmallVector, so it can be adjusted.
+/// Using 32 bit size is desirable to shrink the size of the SmallVector.
+/// Using 64 bit size is desirable for cases like SmallVector<char>, where a
+/// 32 bit size would limit the vector to ~4GB. SmallVectors are used for
+/// buffering bitcode output - which can exceed 4GB.
+template <class Size_T>
+class SmallVectorBase {
+protected:
+	void* BeginX;
+	Size_T Size = 0, Capacity;
+
+	/// The maximum value of the Size_T used.
+	static constexpr size_t SizeTypeMax() {
+		return std::numeric_limits<Size_T>::max();
+	}
+
+	SmallVectorBase() = delete;
+	SmallVectorBase(void* FirstEl, size_t TotalCapacity)
+		: BeginX(FirstEl), Capacity(TotalCapacity) {}
+
+	/// This is a helper for \a grow() that's out of line to reduce code
+	/// duplication.  This function will report a fatal error if it can't grow at
+	/// least to \p MinSize.
+	void* mallocForGrow(size_t MinSize, size_t TSize, size_t& NewCapacity);
+
+	/// This is an implementation of the grow() method which only works
+	/// on POD-like data types and is out of line to reduce code duplication.
+	/// This function will report a fatal error if it cannot increase capacity.
+	void grow_pod(void* FirstEl, size_t MinSize, size_t TSize);
+
+public:
+	size_t size() const { return Size; }
+	size_t capacity() const { return Capacity; }
+
+	[[nodiscard]] bool empty() const { return !Size; }
+
+protected:
+	/// Set the array size to \p N, which the current array must have enough
+	/// capacity for.
+	///
+	/// This does not construct or destroy any elements in the vector.
+	void set_size(size_t N) {
+		assert(N <= capacity());
+		Size = N;
+	}
+};
+
+template <class T>
+using SmallVectorSizeType =
+	typename std::conditional<sizeof(T) < 4 && sizeof(void*) >= 8, uint64_t, uint32_t>::type;
+
+/// Figure out the offset of the first element.
+template <class T, typename = void>
+struct SmallVectorAlignmentAndSize {
+	alignas(SmallVectorBase<SmallVectorSizeType<T>>) char Base[sizeof(
+		SmallVectorBase<SmallVectorSizeType<T>>)];
+	alignas(T) char FirstEl[sizeof(T)];
+};
+
+/// This is the part of SmallVectorTemplateBase which does not depend on whether
+/// the type T is a POD. The extra dummy template argument is used by ArrayRef
+/// to avoid unnecessarily requiring T to be complete.
+template <typename T, typename = void>
+class SmallVectorTemplateCommon
+	: public SmallVectorBase<SmallVectorSizeType<T>> {
+	using Base = SmallVectorBase<SmallVectorSizeType<T>>;
+
+	/// Find the address of the first element.  For this pointer math to be valid
+	/// with small-size of 0 for T with lots of alignment, it's important that
+	/// SmallVectorStorage is properly-aligned even for small-size of 0.
+	void* getFirstEl() const {
+		return const_cast<void*>(reinterpret_cast<const void*>(
+			reinterpret_cast<const char*>(this) +
+			offsetof(SmallVectorAlignmentAndSize<T>, FirstEl)));
+	}
+	// Space after 'FirstEl' is clobbered, do not add any instance vars after it.
+
+protected:
+	SmallVectorTemplateCommon(size_t Size)
+		: Base(getFirstEl(), Size) {}
+
+	void grow_pod(size_t MinSize, size_t TSize) {
+		Base::grow_pod(getFirstEl(), MinSize, TSize);
+	}
+
+	/// Return true if this is a smallvector which has not had dynamic
+	/// memory allocated for it.
+	bool isSmall() const { return this->BeginX == getFirstEl(); }
+
+	/// Put this vector in a state of being small.
+	void resetToSmall() {
+		this->BeginX = getFirstEl();
+		this->Size = this->Capacity = 0; // FIXME: Setting Capacity to 0 is suspect.
+	}
+
+	/// Return true if V is an internal reference to the given range.
+	bool isReferenceToRange(const void* V, const void* First, const void* Last) const {
+		// Use std::less to avoid UB.
+		std::less<> LessThan;
+		return !LessThan(V, First) && LessThan(V, Last);
+	}
+
+	/// Return true if V is an internal reference to this vector.
+	bool isReferenceToStorage(const void* V) const {
+		return isReferenceToRange(V, this->begin(), this->end());
+	}
+
+	/// Return true if First and Last form a valid (possibly empty) range in this
+	/// vector's storage.
+	bool isRangeInStorage(const void* First, const void* Last) const {
+		// Use std::less to avoid UB.
+		std::less<> LessThan;
+		return !LessThan(First, this->begin()) && !LessThan(Last, First) &&
+			!LessThan(this->end(), Last);
+	}
+
+	/// Return true unless Elt will be invalidated by resizing the vector to
+	/// NewSize.
+	bool isSafeToReferenceAfterResize(const void* Elt, size_t NewSize) {
+		// Past the end.
+		if (LLVM_LIKELY(!isReferenceToStorage(Elt)))
+			return true;
+
+		// Return false if Elt will be destroyed by shrinking.
+		if (NewSize <= this->size())
+			return Elt < this->begin() + NewSize;
+
+		// Return false if we need to grow.
+		return NewSize <= this->capacity();
+	}
+
+	/// Check whether Elt will be invalidated by resizing the vector to NewSize.
+	void assertSafeToReferenceAfterResize(const void* Elt, size_t NewSize) {
+		assert(isSafeToReferenceAfterResize(Elt, NewSize) &&
+			"Attempting to reference an element of the vector in an operation "
+			"that invalidates it");
+	}
+
+	/// Check whether Elt will be invalidated by increasing the size of the
+	/// vector by N.
+	void assertSafeToAdd(const void* Elt, size_t N = 1) {
+		this->assertSafeToReferenceAfterResize(Elt, this->size() + N);
+	}
+
+	/// Check whether any part of the range will be invalidated by clearing.
+	void assertSafeToReferenceAfterClear(const T* From, const T* To) {
+		if (From == To)
+			return;
+		this->assertSafeToReferenceAfterResize(From, 0);
+		this->assertSafeToReferenceAfterResize(To - 1, 0);
+	}
+	template <
+		class ItTy,
+		std::enable_if_t<!std::is_same<std::remove_const_t<ItTy>, T*>::value,
+			bool> = false>
+	void assertSafeToReferenceAfterClear(ItTy, ItTy) {}
+
+	/// Check whether any part of the range will be invalidated by growing.
+	void assertSafeToAddRange(const T* From, const T* To) {
+		if (From == To)
+			return;
+		this->assertSafeToAdd(From, To - From);
+		this->assertSafeToAdd(To - 1, To - From);
+	}
+	template <
+		class ItTy,
+		std::enable_if_t<!std::is_same<std::remove_const_t<ItTy>, T*>::value,
+			bool> = false>
+	void assertSafeToAddRange(ItTy, ItTy) {}
+
+	/// Reserve enough space to add one element, and return the updated element
+	/// pointer in case it was a reference to the storage.
+	template <class U>
+	static const T* reserveForParamAndGetAddressImpl(U* This, const T& Elt, size_t N) {
+		size_t NewSize = This->size() + N;
+		if (LLVM_LIKELY(NewSize <= This->capacity()))
+			return &Elt;
+
+		bool ReferencesStorage = false;
+		int64_t Index = -1;
+		if (!U::TakesParamByValue) {
+			if (LLVM_UNLIKELY(This->isReferenceToStorage(&Elt))) {
+				ReferencesStorage = true;
+				Index = &Elt - This->begin();
+			}
+		}
+		This->grow(NewSize);
+		return ReferencesStorage ? This->begin() + Index : &Elt;
+	}
+
+public:
+	using size_type = size_t;
+	using difference_type = ptrdiff_t;
+	using value_type = T;
+	using iterator = T*;
+	using const_iterator = const T*;
+
+	using const_reverse_iterator = std::reverse_iterator<const_iterator>;
+	using reverse_iterator = std::reverse_iterator<iterator>;
+
+	using reference = T&;
+	using const_reference = const T&;
+	using pointer = T*;
+	using const_pointer = const T*;
+
+	using Base::capacity;
+	using Base::empty;
+	using Base::size;
+
+	// forward iterator creation methods.
+	iterator begin() { return (iterator)this->BeginX; }
+	const_iterator begin() const { return (const_iterator)this->BeginX; }
+	iterator end() { return begin() + size(); }
+	const_iterator end() const { return begin() + size(); }
+
+	// reverse iterator creation methods.
+	reverse_iterator rbegin() { return reverse_iterator(end()); }
+	const_reverse_iterator rbegin() const { return const_reverse_iterator(end()); }
+	reverse_iterator rend() { return reverse_iterator(begin()); }
+	const_reverse_iterator rend() const { return const_reverse_iterator(begin()); }
+
+	size_type size_in_bytes() const { return size() * sizeof(T); }
+	size_type max_size() const {
+		return std::min(this->SizeTypeMax(), size_type(-1) / sizeof(T));
+	}
+
+	size_t capacity_in_bytes() const { return capacity() * sizeof(T); }
+
+	/// Return a pointer to the vector's buffer, even if empty().
+	pointer data() { return pointer(begin()); }
+	/// Return a pointer to the vector's buffer, even if empty().
+	const_pointer data() const { return const_pointer(begin()); }
+
+	reference operator[](size_type idx) {
+		assert(idx < size());
+		return begin()[idx];
+	}
+	const_reference operator[](size_type idx) const {
+		assert(idx < size());
+		return begin()[idx];
+	}
+
+	reference front() {
+		assert(!empty());
+		return begin()[0];
+	}
+	const_reference front() const {
+		assert(!empty());
+		return begin()[0];
+	}
+
+	reference back() {
+		assert(!empty());
+		return end()[-1];
+	}
+	const_reference back() const {
+		assert(!empty());
+		return end()[-1];
+	}
+};
+
+/// SmallVectorTemplateBase<TriviallyCopyable = false> - This is where we put
+/// method implementations that are designed to work with non-trivial T's.
+///
+/// We approximate is_trivially_copyable with trivial move/copy construction and
+/// trivial destruction. While the standard doesn't specify that you're allowed
+/// copy these types with memcpy, there is no way for the type to observe this.
+/// This catches the important case of std::pair<POD, POD>, which is not
+/// trivially assignable.
+template <typename T, bool = (std::is_trivially_copy_constructible<T>::value) && (std::is_trivially_move_constructible<T>::value) && std::is_trivially_destructible<T>::value>
+class SmallVectorTemplateBase : public SmallVectorTemplateCommon<T> {
+	friend class SmallVectorTemplateCommon<T>;
+
+protected:
+	static constexpr bool TakesParamByValue = false;
+	using ValueParamT = const T&;
+
+	SmallVectorTemplateBase(size_t Size)
+		: SmallVectorTemplateCommon<T>(Size) {}
+
+	static void destroy_range(T* S, T* E) {
+		while (S != E) {
+			--E;
+			E->~T();
+		}
+	}
+
+	/// Move the range [I, E) into the uninitialized memory starting with "Dest",
+	/// constructing elements as needed.
+	template <typename It1, typename It2>
+	static void uninitialized_move(It1 I, It1 E, It2 Dest) {
+		std::uninitialized_copy(std::make_move_iterator(I),
+			std::make_move_iterator(E),
+			Dest);
+	}
+
+	/// Copy the range [I, E) onto the uninitialized memory starting with "Dest",
+	/// constructing elements as needed.
+	template <typename It1, typename It2>
+	static void uninitialized_copy(It1 I, It1 E, It2 Dest) {
+		std::uninitialized_copy(I, E, Dest);
+	}
+
+	/// Grow the allocated memory (without initializing new elements), doubling
+	/// the size of the allocated memory. Guarantees space for at least one more
+	/// element, or MinSize more elements if specified.
+	void grow(size_t MinSize = 0);
+
+	/// Create a new allocation big enough for \p MinSize and pass back its size
+	/// in \p NewCapacity. This is the first section of \a grow().
+	T* mallocForGrow(size_t MinSize, size_t& NewCapacity) {
+		return static_cast<T*>(
+			SmallVectorBase<SmallVectorSizeType<T>>::mallocForGrow(
+				MinSize, sizeof(T), NewCapacity));
+	}
+
+	/// Move existing elements over to the new allocation \p NewElts, the middle
+	/// section of \a grow().
+	void moveElementsForGrow(T* NewElts);
+
+	/// Transfer ownership of the allocation, finishing up \a grow().
+	void takeAllocationForGrow(T* NewElts, size_t NewCapacity);
+
+	/// Reserve enough space to add one element, and return the updated element
+	/// pointer in case it was a reference to the storage.
+	const T* reserveForParamAndGetAddress(const T& Elt, size_t N = 1) {
+		return this->reserveForParamAndGetAddressImpl(this, Elt, N);
+	}
+
+	/// Reserve enough space to add one element, and return the updated element
+	/// pointer in case it was a reference to the storage.
+	T* reserveForParamAndGetAddress(T& Elt, size_t N = 1) {
+		return const_cast<T*>(
+			this->reserveForParamAndGetAddressImpl(this, Elt, N));
+	}
+
+	static T&& forward_value_param(T&& V) { return std::move(V); }
+	static const T& forward_value_param(const T& V) { return V; }
+
+	void growAndAssign(size_t NumElts, const T& Elt) {
+		// Grow manually in case Elt is an internal reference.
+		size_t NewCapacity;
+		T* NewElts = mallocForGrow(NumElts, NewCapacity);
+		std::uninitialized_fill_n(NewElts, NumElts, Elt);
+		this->destroy_range(this->begin(), this->end());
+		takeAllocationForGrow(NewElts, NewCapacity);
+		this->set_size(NumElts);
+	}
+
+	template <typename... ArgTypes>
+	T& growAndEmplaceBack(ArgTypes&&... Args) {
+		// Grow manually in case one of Args is an internal reference.
+		size_t NewCapacity;
+		T* NewElts = mallocForGrow(0, NewCapacity);
+		::new ((void*)(NewElts + this->size())) T(std::forward<ArgTypes>(Args)...);
+		moveElementsForGrow(NewElts);
+		takeAllocationForGrow(NewElts, NewCapacity);
+		this->set_size(this->size() + 1);
+		return this->back();
+	}
+
+public:
+	void push_back(const T& Elt) {
+		const T* EltPtr = reserveForParamAndGetAddress(Elt);
+		::new ((void*)this->end()) T(*EltPtr);
+		this->set_size(this->size() + 1);
+	}
+
+	void push_back(T&& Elt) {
+		T* EltPtr = reserveForParamAndGetAddress(Elt);
+		::new ((void*)this->end()) T(::std::move(*EltPtr));
+		this->set_size(this->size() + 1);
+	}
+
+	void pop_back() {
+		this->set_size(this->size() - 1);
+		this->end()->~T();
+	}
+};
+
+// Define this out-of-line to dissuade the C++ compiler from inlining it.
+template <typename T, bool TriviallyCopyable>
+void SmallVectorTemplateBase<T, TriviallyCopyable>::grow(size_t MinSize) {
+	size_t NewCapacity;
+	T* NewElts = mallocForGrow(MinSize, NewCapacity);
+	moveElementsForGrow(NewElts);
+	takeAllocationForGrow(NewElts, NewCapacity);
+}
+
+// Define this out-of-line to dissuade the C++ compiler from inlining it.
+template <typename T, bool TriviallyCopyable>
+void SmallVectorTemplateBase<T, TriviallyCopyable>::moveElementsForGrow(
+	T* NewElts) {
+	// Move the elements over.
+	this->uninitialized_move(this->begin(), this->end(), NewElts);
+
+	// Destroy the original elements.
+	destroy_range(this->begin(), this->end());
+}
+
+// Define this out-of-line to dissuade the C++ compiler from inlining it.
+template <typename T, bool TriviallyCopyable>
+void SmallVectorTemplateBase<T, TriviallyCopyable>::takeAllocationForGrow(
+	T* NewElts, size_t NewCapacity) {
+	// If this wasn't grown from the inline copy, deallocate the old space.
+	if (!this->isSmall())
+		free(this->begin());
+
+	this->BeginX = NewElts;
+	this->Capacity = NewCapacity;
+}
+
+/// SmallVectorTemplateBase<TriviallyCopyable = true> - This is where we put
+/// method implementations that are designed to work with trivially copyable
+/// T's. This allows using memcpy in place of copy/move construction and
+/// skipping destruction.
+template <typename T>
+class SmallVectorTemplateBase<T, true> : public SmallVectorTemplateCommon<T> {
+	friend class SmallVectorTemplateCommon<T>;
+
+protected:
+	/// True if it's cheap enough to take parameters by value. Doing so avoids
+	/// overhead related to mitigations for reference invalidation.
+	static constexpr bool TakesParamByValue = sizeof(T) <= 2 * sizeof(void*);
+
+	/// Either const T& or T, depending on whether it's cheap enough to take
+	/// parameters by value.
+	using ValueParamT =
+		typename std::conditional<TakesParamByValue, T, const T&>::type;
+
+	SmallVectorTemplateBase(size_t Size)
+		: SmallVectorTemplateCommon<T>(Size) {}
+
+	// No need to do a destroy loop for POD's.
+	static void destroy_range(T*, T*) {}
+
+	/// Move the range [I, E) onto the uninitialized memory
+	/// starting with "Dest", constructing elements into it as needed.
+	template <typename It1, typename It2>
+	static void uninitialized_move(It1 I, It1 E, It2 Dest) {
+		// Just do a copy.
+		uninitialized_copy(I, E, Dest);
+	}
+
+	/// Copy the range [I, E) onto the uninitialized memory
+	/// starting with "Dest", constructing elements into it as needed.
+	template <typename It1, typename It2>
+	static void uninitialized_copy(It1 I, It1 E, It2 Dest) {
+		// Arbitrary iterator types; just use the basic implementation.
+		std::uninitialized_copy(I, E, Dest);
+	}
+
+	/// Copy the range [I, E) onto the uninitialized memory
+	/// starting with "Dest", constructing elements into it as needed.
+	template <typename T1, typename T2>
+	static void uninitialized_copy(
+		T1* I, T1* E, T2* Dest, std::enable_if_t<std::is_same<typename std::remove_const<T1>::type, T2>::value>* = nullptr) {
+		// Use memcpy for PODs iterated by pointers (which includes SmallVector
+		// iterators): std::uninitialized_copy optimizes to memmove, but we can
+		// use memcpy here. Note that I and E are iterators and thus might be
+		// invalid for memcpy if they are equal.
+		if (I != E)
+			memcpy(reinterpret_cast<void*>(Dest), I, (E - I) * sizeof(T));
+	}
+
+	/// Double the size of the allocated memory, guaranteeing space for at
+	/// least one more element or MinSize if specified.
+	void grow(size_t MinSize = 0) { this->grow_pod(MinSize, sizeof(T)); }
+
+	/// Reserve enough space to add one element, and return the updated element
+	/// pointer in case it was a reference to the storage.
+	const T* reserveForParamAndGetAddress(const T& Elt, size_t N = 1) {
+		return this->reserveForParamAndGetAddressImpl(this, Elt, N);
+	}
+
+	/// Reserve enough space to add one element, and return the updated element
+	/// pointer in case it was a reference to the storage.
+	T* reserveForParamAndGetAddress(T& Elt, size_t N = 1) {
+		return const_cast<T*>(
+			this->reserveForParamAndGetAddressImpl(this, Elt, N));
+	}
+
+	/// Copy \p V or return a reference, depending on \a ValueParamT.
+	static ValueParamT forward_value_param(ValueParamT V) { return V; }
+
+	void growAndAssign(size_t NumElts, T Elt) {
+		// Elt has been copied in case it's an internal reference, side-stepping
+		// reference invalidation problems without losing the realloc optimization.
+		this->set_size(0);
+		this->grow(NumElts);
+		std::uninitialized_fill_n(this->begin(), NumElts, Elt);
+		this->set_size(NumElts);
+	}
+
+	template <typename... ArgTypes>
+	T& growAndEmplaceBack(ArgTypes&&... Args) {
+		// Use push_back with a copy in case Args has an internal reference,
+		// side-stepping reference invalidation problems without losing the realloc
+		// optimization.
+		push_back(T(std::forward<ArgTypes>(Args)...));
+		return this->back();
+	}
+
+public:
+	void push_back(ValueParamT Elt) {
+		const T* EltPtr = reserveForParamAndGetAddress(Elt);
+		memcpy(reinterpret_cast<void*>(this->end()), EltPtr, sizeof(T));
+		this->set_size(this->size() + 1);
+	}
+
+	void pop_back() { this->set_size(this->size() - 1); }
+};
+
+/// This class consists of common code factored out of the SmallVector class to
+/// reduce code duplication based on the SmallVector 'N' template parameter.
+template <typename T>
+class SmallVectorImpl : public SmallVectorTemplateBase<T> {
+	using SuperClass = SmallVectorTemplateBase<T>;
+
+public:
+	using iterator = typename SuperClass::iterator;
+	using const_iterator = typename SuperClass::const_iterator;
+	using reference = typename SuperClass::reference;
+	using size_type = typename SuperClass::size_type;
+
+protected:
+	using SmallVectorTemplateBase<T>::TakesParamByValue;
+	using ValueParamT = typename SuperClass::ValueParamT;
+
+	// Default ctor - Initialize to empty.
+	explicit SmallVectorImpl(unsigned N)
+		: SmallVectorTemplateBase<T>(N) {}
+
+	void assignRemote(SmallVectorImpl&& RHS) {
+		this->destroy_range(this->begin(), this->end());
+		if (!this->isSmall())
+			free(this->begin());
+		this->BeginX = RHS.BeginX;
+		this->Size = RHS.Size;
+		this->Capacity = RHS.Capacity;
+		RHS.resetToSmall();
+	}
+
+public:
+	SmallVectorImpl(const SmallVectorImpl&) = delete;
+
+	~SmallVectorImpl() {
+		// Subclass has already destructed this vector's elements.
+		// If this wasn't grown from the inline copy, deallocate the old space.
+		if (!this->isSmall())
+			free(this->begin());
+	}
+
+	void clear() {
+		this->destroy_range(this->begin(), this->end());
+		this->Size = 0;
+	}
+
+private:
+	// Make set_size() private to avoid misuse in subclasses.
+	using SuperClass::set_size;
+
+	template <bool ForOverwrite>
+	void resizeImpl(size_type N) {
+		if (N == this->size())
+			return;
+
+		if (N < this->size()) {
+			this->truncate(N);
+			return;
+		}
+
+		this->reserve(N);
+		for (auto I = this->end(), E = this->begin() + N; I != E; ++I)
+			if (ForOverwrite)
+				new (&*I) T;
+			else
+				new (&*I) T();
+		this->set_size(N);
+	}
+
+public:
+	void resize(size_type N) { resizeImpl<false>(N); }
+
+	/// Like resize, but \ref T is POD, the new values won't be initialized.
+	void resize_for_overwrite(size_type N) { resizeImpl<true>(N); }
+
+	/// Like resize, but requires that \p N is less than \a size().
+	void truncate(size_type N) {
+		assert(this->size() >= N && "Cannot increase size with truncate");
+		this->destroy_range(this->begin() + N, this->end());
+		this->set_size(N);
+	}
+
+	void resize(size_type N, ValueParamT NV) {
+		if (N == this->size())
+			return;
+
+		if (N < this->size()) {
+			this->truncate(N);
+			return;
+		}
+
+		// N > this->size(). Defer to append.
+		this->append(N - this->size(), NV);
+	}
+
+	void reserve(size_type N) {
+		if (this->capacity() < N)
+			this->grow(N);
+	}
+
+	void pop_back_n(size_type NumItems) {
+		assert(this->size() >= NumItems);
+		truncate(this->size() - NumItems);
+	}
+
+	[[nodiscard]] T pop_back_val() {
+		T Result = ::std::move(this->back());
+		this->pop_back();
+		return Result;
+	}
+
+	void swap(SmallVectorImpl& RHS);
+
+	/// Add the specified range to the end of the SmallVector.
+	template <typename in_iter,
+		typename = std::enable_if_t<std::is_convertible<
+			typename std::iterator_traits<in_iter>::iterator_category,
+			std::input_iterator_tag>::value>>
+	void append(in_iter in_start, in_iter in_end) {
+		this->assertSafeToAddRange(in_start, in_end);
+		size_type NumInputs = std::distance(in_start, in_end);
+		this->reserve(this->size() + NumInputs);
+		this->uninitialized_copy(in_start, in_end, this->end());
+		this->set_size(this->size() + NumInputs);
+	}
+
+	/// Append \p NumInputs copies of \p Elt to the end.
+	void append(size_type NumInputs, ValueParamT Elt) {
+		const T* EltPtr = this->reserveForParamAndGetAddress(Elt, NumInputs);
+		std::uninitialized_fill_n(this->end(), NumInputs, *EltPtr);
+		this->set_size(this->size() + NumInputs);
+	}
+
+	void append(std::initializer_list<T> IL) {
+		append(IL.begin(), IL.end());
+	}
+
+	void append(const SmallVectorImpl& RHS) { append(RHS.begin(), RHS.end()); }
+
+	void assign(size_type NumElts, ValueParamT Elt) {
+		// Note that Elt could be an internal reference.
+		if (NumElts > this->capacity()) {
+			this->growAndAssign(NumElts, Elt);
+			return;
+		}
+
+		// Assign over existing elements.
+		std::fill_n(this->begin(), std::min(NumElts, this->size()), Elt);
+		if (NumElts > this->size())
+			std::uninitialized_fill_n(this->end(), NumElts - this->size(), Elt);
+		else if (NumElts < this->size())
+			this->destroy_range(this->begin() + NumElts, this->end());
+		this->set_size(NumElts);
+	}
+
+	// FIXME: Consider assigning over existing elements, rather than clearing &
+	// re-initializing them - for all assign(...) variants.
+
+	template <typename in_iter,
+		typename = std::enable_if_t<std::is_convertible<
+			typename std::iterator_traits<in_iter>::iterator_category,
+			std::input_iterator_tag>::value>>
+	void assign(in_iter in_start, in_iter in_end) {
+		this->assertSafeToReferenceAfterClear(in_start, in_end);
+		clear();
+		append(in_start, in_end);
+	}
+
+	void assign(std::initializer_list<T> IL) {
+		clear();
+		append(IL);
+	}
+
+	void assign(const SmallVectorImpl& RHS) { assign(RHS.begin(), RHS.end()); }
+
+	iterator erase(const_iterator CI) {
+		// Just cast away constness because this is a non-const member function.
+		iterator I = const_cast<iterator>(CI);
+
+		assert(this->isReferenceToStorage(CI) && "Iterator to erase is out of bounds.");
+
+		iterator N = I;
+		// Shift all elts down one.
+		std::move(I + 1, this->end(), I);
+		// Drop the last elt.
+		this->pop_back();
+		return (N);
+	}
+
+	iterator erase(const_iterator CS, const_iterator CE) {
+		// Just cast away constness because this is a non-const member function.
+		iterator S = const_cast<iterator>(CS);
+		iterator E = const_cast<iterator>(CE);
+
+		assert(this->isRangeInStorage(S, E) && "Range to erase is out of bounds.");
+
+		iterator N = S;
+		// Shift all elts down.
+		iterator I = std::move(E, this->end(), S);
+		// Drop the last elts.
+		this->destroy_range(I, this->end());
+		this->set_size(I - this->begin());
+		return (N);
+	}
+
+private:
+	template <class ArgType>
+	iterator insert_one_impl(iterator I, ArgType&& Elt) {
+		// Callers ensure that ArgType is derived from T.
+		static_assert(
+			std::is_same<std::remove_const_t<std::remove_reference_t<ArgType>>,
+				T>::value,
+			"ArgType must be derived from T!");
+
+		if (I == this->end()) { // Important special case for empty vector.
+			this->push_back(::std::forward<ArgType>(Elt));
+			return this->end() - 1;
+		}
+
+		assert(this->isReferenceToStorage(I) && "Insertion iterator is out of bounds.");
+
+		// Grow if necessary.
+		size_t Index = I - this->begin();
+		std::remove_reference_t<ArgType>* EltPtr =
+			this->reserveForParamAndGetAddress(Elt);
+		I = this->begin() + Index;
+
+		::new ((void*)this->end()) T(::std::move(this->back()));
+		// Push everything else over.
+		std::move_backward(I, this->end() - 1, this->end());
+		this->set_size(this->size() + 1);
+
+		// If we just moved the element we're inserting, be sure to update
+		// the reference (never happens if TakesParamByValue).
+		static_assert(!TakesParamByValue || std::is_same<ArgType, T>::value,
+			"ArgType must be 'T' when taking by value!");
+		if (!TakesParamByValue && this->isReferenceToRange(EltPtr, I, this->end()))
+			++EltPtr;
+
+		*I = ::std::forward<ArgType>(*EltPtr);
+		return I;
+	}
+
+public:
+	iterator insert(iterator I, T&& Elt) {
+		return insert_one_impl(I, this->forward_value_param(std::move(Elt)));
+	}
+
+	iterator insert(iterator I, const T& Elt) {
+		return insert_one_impl(I, this->forward_value_param(Elt));
+	}
+
+	iterator insert(iterator I, size_type NumToInsert, ValueParamT Elt) {
+		// Convert iterator to elt# to avoid invalidating iterator when we reserve()
+		size_t InsertElt = I - this->begin();
+
+		if (I == this->end()) { // Important special case for empty vector.
+			append(NumToInsert, Elt);
+			return this->begin() + InsertElt;
+		}
+
+		assert(this->isReferenceToStorage(I) && "Insertion iterator is out of bounds.");
+
+		// Ensure there is enough space, and get the (maybe updated) address of
+		// Elt.
+		const T* EltPtr = this->reserveForParamAndGetAddress(Elt, NumToInsert);
+
+		// Uninvalidate the iterator.
+		I = this->begin() + InsertElt;
+
+		// If there are more elements between the insertion point and the end of the
+		// range than there are being inserted, we can use a simple approach to
+		// insertion.  Since we already reserved space, we know that this won't
+		// reallocate the vector.
+		if (size_t(this->end() - I) >= NumToInsert) {
+			T* OldEnd = this->end();
+			append(std::move_iterator<iterator>(this->end() - NumToInsert),
+				std::move_iterator<iterator>(this->end()));
+
+			// Copy the existing elements that get replaced.
+			std::move_backward(I, OldEnd - NumToInsert, OldEnd);
+
+			// If we just moved the element we're inserting, be sure to update
+			// the reference (never happens if TakesParamByValue).
+			if (!TakesParamByValue && I <= EltPtr && EltPtr < this->end())
+				EltPtr += NumToInsert;
+
+			std::fill_n(I, NumToInsert, *EltPtr);
+			return I;
+		}
+
+		// Otherwise, we're inserting more elements than exist already, and we're
+		// not inserting at the end.
+
+		// Move over the elements that we're about to overwrite.
+		T* OldEnd = this->end();
+		this->set_size(this->size() + NumToInsert);
+		size_t NumOverwritten = OldEnd - I;
+		this->uninitialized_move(I, OldEnd, this->end() - NumOverwritten);
+
+		// If we just moved the element we're inserting, be sure to update
+		// the reference (never happens if TakesParamByValue).
+		if (!TakesParamByValue && I <= EltPtr && EltPtr < this->end())
+			EltPtr += NumToInsert;
+
+		// Replace the overwritten part.
+		std::fill_n(I, NumOverwritten, *EltPtr);
+
+		// Insert the non-overwritten middle part.
+		std::uninitialized_fill_n(OldEnd, NumToInsert - NumOverwritten, *EltPtr);
+		return I;
+	}
+
+	template <typename ItTy,
+		typename = std::enable_if_t<std::is_convertible<
+			typename std::iterator_traits<ItTy>::iterator_category,
+			std::input_iterator_tag>::value>>
+	iterator insert(iterator I, ItTy From, ItTy To) {
+		// Convert iterator to elt# to avoid invalidating iterator when we reserve()
+		size_t InsertElt = I - this->begin();
+
+		if (I == this->end()) { // Important special case for empty vector.
+			append(From, To);
+			return this->begin() + InsertElt;
+		}
+
+		assert(this->isReferenceToStorage(I) && "Insertion iterator is out of bounds.");
+
+		// Check that the reserve that follows doesn't invalidate the iterators.
+		this->assertSafeToAddRange(From, To);
+
+		size_t NumToInsert = std::distance(From, To);
+
+		// Ensure there is enough space.
+		reserve(this->size() + NumToInsert);
+
+		// Uninvalidate the iterator.
+		I = this->begin() + InsertElt;
+
+		// If there are more elements between the insertion point and the end of the
+		// range than there are being inserted, we can use a simple approach to
+		// insertion.  Since we already reserved space, we know that this won't
+		// reallocate the vector.
+		if (size_t(this->end() - I) >= NumToInsert) {
+			T* OldEnd = this->end();
+			append(std::move_iterator<iterator>(this->end() - NumToInsert),
+				std::move_iterator<iterator>(this->end()));
+
+			// Copy the existing elements that get replaced.
+			std::move_backward(I, OldEnd - NumToInsert, OldEnd);
+
+			std::copy(From, To, I);
+			return I;
+		}
+
+		// Otherwise, we're inserting more elements than exist already, and we're
+		// not inserting at the end.
+
+		// Move over the elements that we're about to overwrite.
+		T* OldEnd = this->end();
+		this->set_size(this->size() + NumToInsert);
+		size_t NumOverwritten = OldEnd - I;
+		this->uninitialized_move(I, OldEnd, this->end() - NumOverwritten);
+
+		// Replace the overwritten part.
+		for (T* J = I; NumOverwritten > 0; --NumOverwritten) {
+			*J = *From;
+			++J;
+			++From;
+		}
+
+		// Insert the non-overwritten middle part.
+		this->uninitialized_copy(From, To, OldEnd);
+		return I;
+	}
+
+	void insert(iterator I, std::initializer_list<T> IL) {
+		insert(I, IL.begin(), IL.end());
+	}
+
+	template <typename... ArgTypes>
+	reference emplace_back(ArgTypes&&... Args) {
+		if (LLVM_UNLIKELY(this->size() >= this->capacity()))
+			return this->growAndEmplaceBack(std::forward<ArgTypes>(Args)...);
+
+		::new ((void*)this->end()) T(std::forward<ArgTypes>(Args)...);
+		this->set_size(this->size() + 1);
+		return this->back();
+	}
+
+	SmallVectorImpl& operator=(const SmallVectorImpl& RHS);
+
+	SmallVectorImpl& operator=(SmallVectorImpl&& RHS);
+
+	bool operator==(const SmallVectorImpl& RHS) const {
+		if (this->size() != RHS.size()) return false;
+		return std::equal(this->begin(), this->end(), RHS.begin());
+	}
+	bool operator!=(const SmallVectorImpl& RHS) const {
+		return !(*this == RHS);
+	}
+
+	bool operator<(const SmallVectorImpl& RHS) const {
+		return std::lexicographical_compare(this->begin(), this->end(), RHS.begin(), RHS.end());
+	}
+};
+
+template <typename T>
+void SmallVectorImpl<T>::swap(SmallVectorImpl<T>& RHS) {
+	if (this == &RHS) return;
+
+	// We can only avoid copying elements if neither vector is small.
+	if (!this->isSmall() && !RHS.isSmall()) {
+		std::swap(this->BeginX, RHS.BeginX);
+		std::swap(this->Size, RHS.Size);
+		std::swap(this->Capacity, RHS.Capacity);
+		return;
+	}
+	this->reserve(RHS.size());
+	RHS.reserve(this->size());
+
+	// Swap the shared elements.
+	size_t NumShared = this->size();
+	if (NumShared > RHS.size()) NumShared = RHS.size();
+	for (size_type i = 0; i != NumShared; ++i)
+		std::swap((*this)[i], RHS[i]);
+
+	// Copy over the extra elts.
+	if (this->size() > RHS.size()) {
+		size_t EltDiff = this->size() - RHS.size();
+		this->uninitialized_copy(this->begin() + NumShared, this->end(), RHS.end());
+		RHS.set_size(RHS.size() + EltDiff);
+		this->destroy_range(this->begin() + NumShared, this->end());
+		this->set_size(NumShared);
+	} else if (RHS.size() > this->size()) {
+		size_t EltDiff = RHS.size() - this->size();
+		this->uninitialized_copy(RHS.begin() + NumShared, RHS.end(), this->end());
+		this->set_size(this->size() + EltDiff);
+		this->destroy_range(RHS.begin() + NumShared, RHS.end());
+		RHS.set_size(NumShared);
+	}
+}
+
+template <typename T>
+SmallVectorImpl<T>& SmallVectorImpl<T>::
+operator=(const SmallVectorImpl<T>& RHS) {
+	// Avoid self-assignment.
+	if (this == &RHS) return *this;
+
+	// If we already have sufficient space, assign the common elements, then
+	// destroy any excess.
+	size_t RHSSize = RHS.size();
+	size_t CurSize = this->size();
+	if (CurSize >= RHSSize) {
+		// Assign common elements.
+		iterator NewEnd;
+		if (RHSSize)
+			NewEnd = std::copy(RHS.begin(), RHS.begin() + RHSSize, this->begin());
+		else
+			NewEnd = this->begin();
+
+		// Destroy excess elements.
+		this->destroy_range(NewEnd, this->end());
+
+		// Trim.
+		this->set_size(RHSSize);
+		return *this;
+	}
+
+	// If we have to grow to have enough elements, destroy the current elements.
+	// This allows us to avoid copying them during the grow.
+	// FIXME: don't do this if they're efficiently moveable.
+	if (this->capacity() < RHSSize) {
+		// Destroy current elements.
+		this->clear();
+		CurSize = 0;
+		this->grow(RHSSize);
+	} else if (CurSize) {
+		// Otherwise, use assignment for the already-constructed elements.
+		std::copy(RHS.begin(), RHS.begin() + CurSize, this->begin());
+	}
+
+	// Copy construct the new elements in place.
+	this->uninitialized_copy(RHS.begin() + CurSize, RHS.end(), this->begin() + CurSize);
+
+	// Set end.
+	this->set_size(RHSSize);
+	return *this;
+}
+
+template <typename T>
+SmallVectorImpl<T>& SmallVectorImpl<T>::operator=(SmallVectorImpl<T>&& RHS) {
+	// Avoid self-assignment.
+	if (this == &RHS) return *this;
+
+	// If the RHS isn't small, clear this vector and then steal its buffer.
+	if (!RHS.isSmall()) {
+		this->assignRemote(std::move(RHS));
+		return *this;
+	}
+
+	// If we already have sufficient space, assign the common elements, then
+	// destroy any excess.
+	size_t RHSSize = RHS.size();
+	size_t CurSize = this->size();
+	if (CurSize >= RHSSize) {
+		// Assign common elements.
+		iterator NewEnd = this->begin();
+		if (RHSSize)
+			NewEnd = std::move(RHS.begin(), RHS.end(), NewEnd);
+
+		// Destroy excess elements and trim the bounds.
+		this->destroy_range(NewEnd, this->end());
+		this->set_size(RHSSize);
+
+		// Clear the RHS.
+		RHS.clear();
+
+		return *this;
+	}
+
+	// If we have to grow to have enough elements, destroy the current elements.
+	// This allows us to avoid copying them during the grow.
+	// FIXME: this may not actually make any sense if we can efficiently move
+	// elements.
+	if (this->capacity() < RHSSize) {
+		// Destroy current elements.
+		this->clear();
+		CurSize = 0;
+		this->grow(RHSSize);
+	} else if (CurSize) {
+		// Otherwise, use assignment for the already-constructed elements.
+		std::move(RHS.begin(), RHS.begin() + CurSize, this->begin());
+	}
+
+	// Move-construct the new elements in place.
+	this->uninitialized_move(RHS.begin() + CurSize, RHS.end(), this->begin() + CurSize);
+
+	// Set end.
+	this->set_size(RHSSize);
+
+	RHS.clear();
+	return *this;
+}
+
+/// Storage for the SmallVector elements.  This is specialized for the N=0 case
+/// to avoid allocating unnecessary storage.
+template <typename T, unsigned N>
+struct SmallVectorStorage {
+	alignas(T) char InlineElts[N * sizeof(T)];
+};
+
+/// We need the storage to be properly aligned even for small-size of 0 so that
+/// the pointer math in \a SmallVectorTemplateCommon::getFirstEl() is
+/// well-defined.
+template <typename T>
+struct alignas(T) SmallVectorStorage<T, 0> {};
+
+/// Forward declaration of SmallVector so that
+/// calculateSmallVectorDefaultInlinedElements can reference
+/// `sizeof(SmallVector<T, 0>)`.
+template <typename T, unsigned N>
+class SmallVector;
+
+/// Helper class for calculating the default number of inline elements for
+/// `SmallVector<T>`.
+///
+/// This should be migrated to a constexpr function when our minimum
+/// compiler support is enough for multi-statement constexpr functions.
+template <typename T>
+struct CalculateSmallVectorDefaultInlinedElements {
+	// Parameter controlling the default number of inlined elements
+	// for `SmallVector<T>`.
+	//
+	// The default number of inlined elements ensures that
+	// 1. There is at least one inlined element.
+	// 2. `sizeof(SmallVector<T>) <= kPreferredSmallVectorSizeof` unless
+	// it contradicts 1.
+	static constexpr size_t kPreferredSmallVectorSizeof = 64;
+
+	// static_assert that sizeof(T) is not "too big".
+	//
+	// Because our policy guarantees at least one inlined element, it is possible
+	// for an arbitrarily large inlined element to allocate an arbitrarily large
+	// amount of inline storage. We generally consider it an antipattern for a
+	// SmallVector to allocate an excessive amount of inline storage, so we want
+	// to call attention to these cases and make sure that users are making an
+	// intentional decision if they request a lot of inline storage.
+	//
+	// We want this assertion to trigger in pathological cases, but otherwise
+	// not be too easy to hit. To accomplish that, the cutoff is actually somewhat
+	// larger than kPreferredSmallVectorSizeof (otherwise,
+	// `SmallVector<SmallVector<T>>` would be one easy way to trip it, and that
+	// pattern seems useful in practice).
+	//
+	// One wrinkle is that this assertion is in theory non-portable, since
+	// sizeof(T) is in general platform-dependent. However, we don't expect this
+	// to be much of an issue, because most LLVM development happens on 64-bit
+	// hosts, and therefore sizeof(T) is expected to *decrease* when compiled for
+	// 32-bit hosts, dodging the issue. The reverse situation, where development
+	// happens on a 32-bit host and then fails due to sizeof(T) *increasing* on a
+	// 64-bit host, is expected to be very rare.
+	static_assert(
+		sizeof(T) <= 256,
+		"You are trying to use a default number of inlined elements for "
+		"`SmallVector<T>` but `sizeof(T)` is really big! Please use an "
+		"explicit number of inlined elements with `SmallVector<T, N>` to make "
+		"sure you really want that much inline storage.");
+
+	// Discount the size of the header itself when calculating the maximum inline
+	// bytes.
+	static constexpr size_t PreferredInlineBytes =
+		kPreferredSmallVectorSizeof - sizeof(SmallVector<T, 0>);
+	static constexpr size_t NumElementsThatFit = PreferredInlineBytes / sizeof(T);
+	static constexpr size_t value =
+		NumElementsThatFit == 0 ? 1 : NumElementsThatFit;
+};
+
+/// This is a 'vector' (really, a variable-sized array), optimized
+/// for the case when the array is small.  It contains some number of elements
+/// in-place, which allows it to avoid heap allocation when the actual number of
+/// elements is below that threshold.  This allows normal "small" cases to be
+/// fast without losing generality for large inputs.
+///
+/// \note
+/// In the absence of a well-motivated choice for the number of inlined
+/// elements \p N, it is recommended to use \c SmallVector<T> (that is,
+/// omitting the \p N). This will choose a default number of inlined elements
+/// reasonable for allocation on the stack (for example, trying to keep \c
+/// sizeof(SmallVector<T>) around 64 bytes).
+///
+/// \warning This does not attempt to be exception safe.
+///
+/// \see https://llvm.org/docs/ProgrammersManual.html#llvm-adt-smallvector-h
+template <typename T,
+	unsigned N = CalculateSmallVectorDefaultInlinedElements<T>::value>
+class SmallVector : public SmallVectorImpl<T>,
+					SmallVectorStorage<T, N> {
+public:
+	SmallVector()
+		: SmallVectorImpl<T>(N) {}
+
+	~SmallVector() {
+		// Destroy the constructed elements in the vector.
+		this->destroy_range(this->begin(), this->end());
+	}
+
+	explicit SmallVector(size_t Size, const T& Value = T())
+		: SmallVectorImpl<T>(N) {
+		this->assign(Size, Value);
+	}
+
+	template <typename ItTy,
+		typename = std::enable_if_t<std::is_convertible<
+			typename std::iterator_traits<ItTy>::iterator_category,
+			std::input_iterator_tag>::value>>
+	SmallVector(ItTy S, ItTy E)
+		: SmallVectorImpl<T>(N) {
+		this->append(S, E);
+	}
+
+	template <typename RangeTy>
+	explicit SmallVector(const iterator_range<RangeTy>& R)
+		: SmallVectorImpl<T>(N) {
+		this->append(R.begin(), R.end());
+	}
+
+	SmallVector(std::initializer_list<T> IL)
+		: SmallVectorImpl<T>(N) {
+		this->assign(IL);
+	}
+
+	SmallVector(const SmallVector& RHS)
+		: SmallVectorImpl<T>(N) {
+		if (!RHS.empty())
+			SmallVectorImpl<T>::operator=(RHS);
+	}
+
+	SmallVector& operator=(const SmallVector& RHS) {
+		SmallVectorImpl<T>::operator=(RHS);
+		return *this;
+	}
+
+	SmallVector(SmallVector&& RHS)
+		: SmallVectorImpl<T>(N) {
+		if (!RHS.empty())
+			SmallVectorImpl<T>::operator=(::std::move(RHS));
+	}
+
+	SmallVector(SmallVectorImpl<T>&& RHS)
+		: SmallVectorImpl<T>(N) {
+		if (!RHS.empty())
+			SmallVectorImpl<T>::operator=(::std::move(RHS));
+	}
+
+	SmallVector& operator=(SmallVector&& RHS) {
+		if (N) {
+			SmallVectorImpl<T>::operator=(::std::move(RHS));
+			return *this;
+		}
+		// SmallVectorImpl<T>::operator= does not leverage N==0. Optimize the
+		// case.
+		if (this == &RHS)
+			return *this;
+		if (RHS.empty()) {
+			this->destroy_range(this->begin(), this->end());
+			this->Size = 0;
+		} else {
+			this->assignRemote(std::move(RHS));
+		}
+		return *this;
+	}
+
+	SmallVector& operator=(SmallVectorImpl<T>&& RHS) {
+		SmallVectorImpl<T>::operator=(::std::move(RHS));
+		return *this;
+	}
+
+	SmallVector& operator=(std::initializer_list<T> IL) {
+		this->assign(IL);
+		return *this;
+	}
+};
+
+template <typename T, unsigned N>
+inline size_t capacity_in_bytes(const SmallVector<T, N>& X) {
+	return X.capacity_in_bytes();
+}
+
+template <typename RangeType>
+using ValueTypeFromRangeType =
+	typename std::remove_const<typename std::remove_reference<
+		decltype(*std::begin(std::declval<RangeType&>()))>::type>::type;
+
+/// Given a range of type R, iterate the entire range and return a
+/// SmallVector with elements of the vector.  This is useful, for example,
+/// when you want to iterate a range and then sort the results.
+template <unsigned Size, typename R>
+SmallVector<ValueTypeFromRangeType<R>, Size> to_vector(R&& Range) {
+	return { std::begin(Range), std::end(Range) };
+}
+template <typename R>
+SmallVector<ValueTypeFromRangeType<R>,
+	CalculateSmallVectorDefaultInlinedElements<
+		ValueTypeFromRangeType<R>>::value>
+to_vector(R&& Range) {
+	return { std::begin(Range), std::end(Range) };
+}
+
+namespace std {
+
+/// Implement std::swap in terms of SmallVector swap.
+template <typename T>
+inline void swap(SmallVectorImpl<T>& LHS, SmallVectorImpl<T>& RHS) {
+	LHS.swap(RHS);
+}
+
+/// Implement std::swap in terms of SmallVector swap.
+template <typename T, unsigned N>
+inline void swap(SmallVector<T, N>& LHS, SmallVector<T, N>& RHS) {
+	LHS.swap(RHS);
+}
+
+} // namespace std
+
+#ifdef _MSC_VER
+#	pragma warning(pop)
+#endif
diff --git a/source/10-common/StbImplementations.c b/source/10-common/StbImplementations.c
new file mode 100644
index 0000000..73bbc2a
--- /dev/null
+++ b/source/10-common/StbImplementations.c
@@ -0,0 +1,14 @@
+#define STB_RECT_PACK_IMPLEMENTATION
+#include <stb_rect_pack.h>
+
+#define STB_TRUETYPE_IMPLEMENTATION
+#include <stb_truetype.h>
+
+#define STB_IMAGE_IMPLEMENTATION
+#include <stb_image.h>
+
+#define STB_SPRINTF_IMPLEMENTATION
+#include <stb_sprintf.h>
+
+#define STB_C_LEXER_IMPLEMENTATION
+#include <stb_c_lexer.h>
diff --git a/source/10-common/TypeTraits.hpp b/source/10-common/TypeTraits.hpp
new file mode 100644
index 0000000..cca9a1f
--- /dev/null
+++ b/source/10-common/TypeTraits.hpp
@@ -0,0 +1,19 @@
+#pragma once
+
+template <class T>
+struct DefaultDeleter {
+    void operator()(T* ptr) const {
+        delete ptr;
+    }
+};
+
+template <class>
+struct RemoveMemberPtrImpl {};
+
+template <class T, class U>
+struct RemoveMemberPtrImpl<U T::*> {
+    using Type = U;
+};
+
+template <class T>
+using RemoveMemberPtr = typename RemoveMemberPtrImpl<T>::Type;
diff --git a/source/10-common/Uid.cpp b/source/10-common/Uid.cpp
new file mode 100644
index 0000000..1930cd8
--- /dev/null
+++ b/source/10-common/Uid.cpp
@@ -0,0 +1,58 @@
+#include "Uid.hpp"
+
+#include "RapidJsonHelper.hpp"
+
+#include <rapidjson/document.h>
+#include <cstring>
+#include <random>
+
+Uid Uid::Create() {
+	std::random_device rd;
+	std::mt19937_64 gen(rd());
+	std::uniform_int_distribution<uint64_t> dist(
+		std::numeric_limits<uint64_t>::min(),
+		std::numeric_limits<uint64_t>::max());
+
+	Uid uid;
+	uid.upper = dist(gen);
+	uid.lower = dist(gen);
+	return uid;
+}
+
+bool Uid::IsNull() const {
+	return upper == 0 && lower == 0;
+}
+
+void Uid::ReadString(std::string_view str) {
+	sscanf(str.data(), BRUSSEL_Uid_SCAN_STR, &upper, &lower);
+}
+
+std::string Uid::WriteString() {
+	char buf[256];
+	snprintf(buf, sizeof(buf), BRUSSEL_Uid_FORMAT_STR, upper, lower);
+	return std::string(buf);
+}
+
+void Uid::Read(const rapidjson::Value& value) {
+	assert(value.IsArray());
+	assert(value.Size() == 2);
+	auto& upper = value[0];
+	assert(upper.IsUint64());
+	auto& lower = value[1];
+	assert(lower.IsUint64());
+
+	this->upper = upper.GetUint64();
+	this->lower = lower.GetUint64();
+}
+
+void Uid::WriteInto(rapidjson::Value& value, rapidjson::Document& root) {
+	value.Reserve(2, root.GetAllocator());
+	value.PushBack((uint64_t)upper, root.GetAllocator());
+	value.PushBack((uint64_t)lower, root.GetAllocator());
+}
+
+rapidjson::Value Uid::Write(rapidjson::Document& root) {
+	rapidjson::Value result(rapidjson::kArrayType);
+	WriteInto(result, root);
+	return result;
+}
diff --git a/source/10-common/Uid.hpp b/source/10-common/Uid.hpp
new file mode 100644
index 0000000..f58129c
--- /dev/null
+++ b/source/10-common/Uid.hpp
@@ -0,0 +1,42 @@
+#pragma once
+
+#include "Utils.hpp"
+
+#include <rapidjson/fwd.h>
+#include <cinttypes>
+#include <functional>
+#include <string>
+#include <string_view>
+
+#define BRUSSEL_Uid_SCAN_STR "%" PRIx64 "-%" PRIx64
+#define BRUSSEL_Uid_SCAN_EXPAND(uid) &((uid).upper), &((uid).upper)
+#define BRUSSEL_Uid_FORMAT_STR "%016" PRIx64 "-%016" PRIx64
+#define BRUSSEL_Uid_FORMAT_EXPAND(uid) (uid).upper, (uid).lower
+
+struct Uid {
+	uint64_t upper = 0;
+	uint64_t lower = 0;
+
+	static Uid Create();
+
+	bool IsNull() const;
+
+	void ReadString(std::string_view str);
+	std::string WriteString();
+
+	void Read(const rapidjson::Value& value);
+	void WriteInto(rapidjson::Value& value, rapidjson::Document& root);
+	rapidjson::Value Write(rapidjson::Document& root);
+
+	auto operator<=>(const Uid&) const = default;
+};
+
+template <>
+struct std::hash<Uid> {
+	size_t operator()(const Uid& uid) const {
+		size_t hash = 0;
+		Utils::HashCombine(hash, uid.upper);
+		Utils::HashCombine(hash, uid.lower);
+		return hash;
+	}
+};
diff --git a/source/10-common/Utils.cpp b/source/10-common/Utils.cpp
new file mode 100644
index 0000000..53b3863
--- /dev/null
+++ b/source/10-common/Utils.cpp
@@ -0,0 +1,87 @@
+#include "Utils.hpp"
+
+#ifdef _WIN32
+#	include <Windows.h>
+#endif
+
+#ifdef _WIN32
+#	define BRUSSEL_MODE_STRING(string) L##string
+#else
+#	define BRUSSEL_MODE_STRING(string) string
+#endif
+
+#if _WIN32
+using FopenModeString = const wchar_t*;
+#else
+using FopenModeString = const char*;
+#endif
+
+static FopenModeString GetModeString(Utils::IoMode mode, bool binary) {
+	using namespace Utils;
+	if (binary) {
+		switch (mode) {
+			case Read: return BRUSSEL_MODE_STRING("rb");
+			case WriteTruncate: return BRUSSEL_MODE_STRING("wb");
+			case WriteAppend: return BRUSSEL_MODE_STRING("ab");
+		}
+	} else {
+		switch (mode) {
+			case Read: return BRUSSEL_MODE_STRING("r");
+			case WriteTruncate: return BRUSSEL_MODE_STRING("w");
+			case WriteAppend: return BRUSSEL_MODE_STRING("a");
+		}
+	}
+	return nullptr;
+}
+
+FILE* Utils::OpenCstdioFile(const std::filesystem::path& path, IoMode mode, bool binary) {
+#ifdef _WIN32
+	// std::filesystem::path::c_str() returns `const wchar_t*` under Windows, because NT uses UTF-16 natively
+	// NOTE: _wfopen() only affects the type of path parameter, otherwise the file stream created is identical to the one by fopen()
+	return _wfopen(path.c_str(), ::GetModeString(mode, binary));
+#else
+	return fopen(path.c_str(), ::GetModeString(mode, binary));
+#endif
+}
+
+FILE* Utils::OpenCstdioFile(const char* path, IoMode mode, bool binary) {
+#ifdef _WIN32
+	// On Windows, fopen() accepts ANSI codepage encoded path, convert our UTF-8 string to UTF-16 to ensure that no matter what the locale is, the path continues to work
+	WCHAR platformPath[MAX_PATH];
+	if (MultiByteToWideChar(CP_UTF8, 0, path, -1, platformPath, MAX_PATH) == 0) {
+		return nullptr;
+	}
+	return _wfopen(platformPath, ::GetModeString(mode, binary));
+#else
+	return fopen(path, ::GetModeString(mode, binary));
+#endif
+}
+
+bool Utils::InRangeInclusive(int n, int lower, int upper) {
+	if (lower > upper) {
+		std::swap(lower, upper);
+	}
+	return n >= lower && n <= upper;
+}
+
+bool Utils::LineContains(glm::ivec2 p1, glm::ivec2 p2, glm::ivec2 candidate) {
+	bool verticalLine = p1.x == p2.x && InRangeInclusive(candidate.x, p1.x, p2.x);
+	bool horizontalLine = p1.y == p2.y && InRangeInclusive(candidate.y, p1.y, p2.y);
+	return verticalLine && horizontalLine;
+}
+
+bool Utils::IsColinear(glm::ivec2 p1, glm::ivec2 p2) {
+	return p1.x == p2.x || p1.y == p2.y;
+}
+
+std::string Utils::MakeRandomNumberedName(const char* tag) {
+	int n = std::rand();
+#define RNG_NAME_PATTERN "Unnamed %s #%d", tag, n
+	// NOTE: does not include null-terminator
+	int size = snprintf(nullptr, 0, RNG_NAME_PATTERN);
+	std::string result;
+	result.resize(size); // std::string::resize handles storage for null-terminator alreaedy
+	snprintf(result.data(), size, RNG_NAME_PATTERN);
+#undef RNG_NAME_PATTERN
+	return result;
+}
diff --git a/source/10-common/Utils.hpp b/source/10-common/Utils.hpp
new file mode 100644
index 0000000..9f28aad
--- /dev/null
+++ b/source/10-common/Utils.hpp
@@ -0,0 +1,61 @@
+#pragma once
+
+#include <robin_hood.h>
+#include <cstdio>
+#include <cstring>
+#include <filesystem>
+#include <glm/glm.hpp>
+
+namespace Utils {
+
+enum IoMode {
+	Read,
+	WriteTruncate,
+	WriteAppend,
+};
+
+FILE* OpenCstdioFile(const std::filesystem::path& path, IoMode mode, bool binary = false);
+FILE* OpenCstdioFile(const char* path, IoMode mode, bool binary = false);
+
+constexpr float Abs(float v) noexcept {
+	return v < 0.0f ? -v : v;
+}
+
+bool InRangeInclusive(int n, int lower, int upper);
+bool LineContains(glm::ivec2 p1, glm::ivec2 p2, glm::ivec2 candidate);
+
+bool IsColinear(glm::ivec2 p1, glm::ivec2 p2);
+
+template <class T>
+void HashCombine(std::size_t& seed, const T& v) {
+	seed ^= std::hash<T>{}(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
+}
+
+std::string MakeRandomNumberedName(const char* tag);
+
+} // namespace Utils
+
+struct StringHash {
+	using is_transparent = void;
+
+	std::size_t operator()(const std::string& key) const { return robin_hood::hash_bytes(key.c_str(), key.size()); }
+	std::size_t operator()(std::string_view key) const { return robin_hood::hash_bytes(key.data(), key.size()); }
+	std::size_t operator()(const char* key) const { return robin_hood::hash_bytes(key, std::strlen(key)); }
+};
+
+struct StringEqual {
+	using is_transparent = int;
+
+	bool operator()(std::string_view lhs, const std::string& rhs) const {
+		const std::string_view view = rhs;
+		return lhs == view;
+	}
+
+	bool operator()(const char* lhs, const std::string& rhs) const {
+		return std::strcmp(lhs, rhs.c_str()) == 0;
+	}
+
+	bool operator()(const std::string& lhs, const std::string& rhs) const {
+		return lhs == rhs;
+	}
+};
diff --git a/source/10-common/YCombinator.hpp b/source/10-common/YCombinator.hpp
new file mode 100644
index 0000000..b1d2350
--- /dev/null
+++ b/source/10-common/YCombinator.hpp
@@ -0,0 +1,14 @@
+#pragma once
+
+template <class Func>
+struct YCombinator {
+	// NOTE: implicit constructor allows initializing this
+	Func func;
+
+	template <class... Ts>
+	decltype(auto) operator()(Ts&&... args) const {
+        // NOTE: static_cast<Ts>(args)... is equivalent to std::forward<Ts>(args)...
+        //       written this way so that we don't have to include <utility>, as well as reducing template instanciations to help compile time
+		return func(*this, static_cast<Ts>(args)...);
+	}
+};
diff --git a/source/20-codegen-compiler/CodegenConfig.hpp b/source/20-codegen-compiler/CodegenConfig.hpp
new file mode 100644
index 0000000..b9dc56c
--- /dev/null
+++ b/source/20-codegen-compiler/CodegenConfig.hpp
@@ -0,0 +1,11 @@
+#pragma once
+
+#ifndef CODEGEN_DEBUG_PRINT
+#	define CODEGEN_DEBUG_PRINT 0
+#endif
+
+#if CODEGEN_DEBUG_PRINT
+#	define DEBUG_PRINTF(...) printf(__VA_ARGS__)
+#else
+#	define DEBUG_PRINTF(...)
+#endif
diff --git a/source/20-codegen-compiler/CodegenDecl.cpp b/source/20-codegen-compiler/CodegenDecl.cpp
new file mode 100644
index 0000000..7cf21ce
--- /dev/null
+++ b/source/20-codegen-compiler/CodegenDecl.cpp
@@ -0,0 +1,49 @@
+#include "CodegenDecl.hpp"
+
+#include <Utils.hpp>
+
+static EnumValuePattern NextPattern(EnumValuePattern val) {
+	return (EnumValuePattern)(val + 1);
+}
+
+EnumValuePattern DeclEnum::CalcPattern() const {
+	if (elements.empty()) return EVP_Continuous;
+
+	auto pattern = EVP_Continuous;
+restart:
+	auto lastVal = elements[0].value;
+	for (size_t i = 1; i < elements.size(); ++i) {
+		auto currVal = elements[i].value;
+		switch (pattern) {
+			case EVP_Continuous: {
+				bool satisfy = lastVal + 1 == currVal;
+				if (!satisfy) {
+					pattern = NextPattern(pattern);
+					goto restart;
+				}
+			} break;
+
+			case EVP_Bits: {
+				bool satisfy = (lastVal << 1) == currVal;
+				if (!satisfy) {
+					pattern = NextPattern(pattern);
+					goto restart;
+				}
+			} break;
+
+			// A random pattern can match anything
+			case EVP_Random:
+			case EVP_COUNT: break;
+		}
+		lastVal = currVal;
+	}
+
+	return pattern;
+}
+
+EnumValuePattern DeclEnum::GetPattern() const {
+	if (pattern == EVP_COUNT) {
+		pattern = CalcPattern();
+	}
+	return pattern;
+}
diff --git a/source/20-codegen-compiler/CodegenDecl.hpp b/source/20-codegen-compiler/CodegenDecl.hpp
new file mode 100644
index 0000000..32d5445
--- /dev/null
+++ b/source/20-codegen-compiler/CodegenDecl.hpp
@@ -0,0 +1,74 @@
+#pragma once
+
+#include <string>
+#include <vector>
+
+struct DeclNamespace {
+	DeclNamespace* container = nullptr;
+	std::string name;
+	std::string_view fullname; // View into storage map key
+};
+
+// Structs or classes
+struct DeclStruct {
+	DeclNamespace* container = nullptr;
+	std::string name;
+};
+
+enum EnumUnderlyingType {
+	EUT_Int8,
+	EUT_Int16,
+	EUT_Int32,
+	EUT_Int64,
+	EUT_Uint8,
+	EUT_Uint16,
+	EUT_Uint32,
+	EUT_Uint64,
+	EUT_COUNT,
+};
+
+enum EnumValuePattern {
+	// The numbers cover n..m with no gaps
+	EVP_Continuous,
+	// The numbers cover for i in n..m, 1 << i
+	// e.g. [0] = 1 << 0,
+	//      [1] = 1 << 1.
+	//      [2] = 1 << 2. etc.
+	EVP_Bits,
+	// The numbesr don't have a particular pattern
+	EVP_Random,
+	EVP_COUNT,
+};
+
+struct DeclEnumElement {
+	std::string name;
+	// TODO support int64_t, etc. enum underlying types
+	uint64_t value;
+};
+
+struct DeclEnum {
+	DeclNamespace* container = nullptr;
+	std::string name;
+	std::vector<DeclEnumElement> elements;
+	EnumUnderlyingType underlyingType;
+	// Start with invalid value, calculate on demand
+	mutable EnumValuePattern pattern = EVP_COUNT;
+
+	EnumValuePattern CalcPattern() const;
+	EnumValuePattern GetPattern() const;
+};
+
+struct DeclFunctionArgument {
+	std::string type;
+	std::string name;
+};
+
+struct DeclFunction {
+	DeclNamespace* container = nullptr;
+	// Things like extern, static, etc. that gets written before the function return type
+	std::string prefix;
+	std::string name;
+	std::string returnType;
+	std::vector<DeclFunctionArgument> arguments;
+	std::string body;
+};
diff --git a/source/20-codegen-compiler/CodegenInput.inl b/source/20-codegen-compiler/CodegenInput.inl
new file mode 100644
index 0000000..0809e7f
--- /dev/null
+++ b/source/20-codegen-compiler/CodegenInput.inl
@@ -0,0 +1,69 @@
+#pragma once
+
+#include "CodegenConfig.hpp"
+#include "CodegenDecl.hpp"
+
+#include "CodegenUtils.inl"
+
+#include <Utils.hpp>
+
+#include <robin_hood.h>
+#include <cinttypes>
+#include <string>
+#include <string_view>
+#include <vector>
+
+using namespace std::literals;
+
+class CodegenInput {
+private:
+	std::vector<DeclEnum> mEnums;
+	robin_hood::unordered_flat_map<std::string, size_t, StringHash, StringEqual> mDeclByName;
+	robin_hood::unordered_node_map<std::string, DeclNamespace, StringHash, StringEqual> mNamespaces;
+
+public:
+	void AddEnum(std::string fullname, DeclEnum decl) {
+#if CODEGEN_DEBUG_PRINT
+		printf("Committed enum '%s'\n", decl.name.c_str());
+		for (auto& elm : decl.elements) {
+			printf("  - element %s = %" PRId64 "\n", elm.name.c_str(), elm.value);
+		}
+#endif
+
+		mDeclByName.try_emplace(std::move(fullname), mEnums.size());
+		mEnums.push_back(std::move(decl));
+	}
+
+	DeclNamespace* AddNamespace(DeclNamespace ns) {
+		auto path = Utils::MakeFullName(""sv, &ns);
+		auto [iter, success] = mNamespaces.try_emplace(std::move(path), std::move(ns));
+		auto& nsRef = iter->second;
+		if (success) {
+			nsRef.fullname = iter->first;
+		}
+		return &nsRef;
+	}
+
+	const DeclEnum* FindEnumByName(std::string_view name) const {
+		// TODO handle multiple kinds of decl
+		auto iter = mDeclByName.find(name);
+		if (iter != mDeclByName.end()) {
+			return &mEnums[iter->second];
+		} else {
+			return nullptr;
+		}
+	}
+
+	const DeclNamespace* FindNamespace(std::string_view fullname) const {
+		auto iter = mNamespaces.find(fullname);
+		if (iter != mNamespaces.end()) {
+			return &iter->second;
+		} else {
+			return nullptr;
+		}
+	}
+
+	DeclNamespace* FindNamespace(std::string_view name) {
+		return const_cast<DeclNamespace*>(const_cast<const CodegenInput*>(this)->FindNamespace(name));
+	}
+};
diff --git a/source/20-codegen-compiler/CodegenMacros.hpp b/source/20-codegen-compiler/CodegenMacros.hpp
new file mode 100644
index 0000000..84c9d09
--- /dev/null
+++ b/source/20-codegen-compiler/CodegenMacros.hpp
@@ -0,0 +1,30 @@
+#pragma once
+
+#include <algorithm>
+
+// I give up, hopefully nothing overflows this buffer
+// TODO handle buffer sizing properly
+
+#define APPEND_LIT(out, str) out += str
+
+#define APPEND_FMT(out, format, ...)                           \
+	{                                                          \
+		char buffer[65536];                                    \
+		snprintf(buffer, sizeof(buffer), format, __VA_ARGS__); \
+		out += buffer;                                         \
+	}
+
+#define WRITE_LIT(file, str) fwrite(str, sizeof(char), sizeof(str) - 1, file)
+
+// NOTE: snprintf() returns the size written (given an infinite buffer) not including \0
+#define WRITE_FMT(file, format, ...)                                             \
+	{                                                                            \
+		char buffer[65536];                                                      \
+		int size = snprintf(buffer, sizeof(buffer), format, __VA_ARGS__);        \
+		fwrite(buffer, sizeof(char), std::min<int>(size, sizeof(buffer)), file); \
+	}
+
+#define APPEND_LIT_LN(out, str) APPEND_LIT(out, (str "\n"))
+#define APPEND_FMT_LN(out, format, ...) APPEND_FMT(out, (format "\n"), __VA_ARGS__)
+#define WRITE_LIT_LN(out, str) WRITE_LIT(out, (str "\n"))
+#define WRITE_FMT_LN(out, format, ...) WRITE_FMT(out, (format "\n"), __VA_ARGS__)
diff --git a/source/20-codegen-compiler/CodegenOutput.inl b/source/20-codegen-compiler/CodegenOutput.inl
new file mode 100644
index 0000000..ff7b912
--- /dev/null
+++ b/source/20-codegen-compiler/CodegenOutput.inl
@@ -0,0 +1,76 @@
+#pragma once
+
+#include "CodegenDecl.hpp"
+#include "CodegenMacros.hpp"
+
+#include <Utils.hpp>
+
+#include <robin_hood.h>
+#include <algorithm>
+#include <cstdio>
+#include <cstdlib>
+#include <string>
+#include <vector>
+
+// A generic "thing" (could be anything, comments, string-concated functionsm, etc.) to spit into the output file
+struct CodegenOutputThing {
+	std::string text;
+};
+
+class CodegenOutput {
+private:
+	robin_hood::unordered_set<std::string, StringHash, StringEqual> mRequestIncludes;
+	std::vector<CodegenOutputThing> mOutThings;
+	std::vector<DeclStruct> mOutStructs;
+	std::vector<DeclEnum> mOutEnums;
+	std::vector<DeclFunction> mOutFunctions;
+
+public:
+	std::string optionOutPrefix;
+	// Whether to add prefixes mOutPrefix to all global names or not
+	bool optionAutoAddPrefix : 1 = false;
+
+public:
+	void AddRequestInclude(std::string_view include) {
+		if (!mRequestIncludes.contains(include)) {
+			mRequestIncludes.insert(std::string(include));
+		}
+	}
+
+	void AddOutputThing(CodegenOutputThing thing) {
+		mOutThings.push_back(std::move(thing));
+	}
+
+	void MergeContents(CodegenOutput other) {
+		std::move(other.mOutThings.begin(), other.mOutThings.end(), std::back_inserter(this->mOutThings));
+		std::move(other.mOutStructs.begin(), other.mOutStructs.end(), std::back_inserter(this->mOutStructs));
+		std::move(other.mOutEnums.begin(), other.mOutEnums.end(), std::back_inserter(this->mOutEnums));
+		std::move(other.mOutFunctions.begin(), other.mOutFunctions.end(), std::back_inserter(this->mOutFunctions));
+	}
+
+	void Write(FILE* file) const {
+		for (auto& include : mRequestIncludes) {
+			// TODO how to resolve to the correct include paths?
+			WRITE_FMT_LN(file, "#include <%s>", include.c_str());
+		}
+
+		for (auto& thing : mOutThings) {
+			fwrite(thing.text.c_str(), sizeof(char), thing.text.size(), file);
+			WRITE_LIT(file, "\n");
+		}
+
+		for (auto& declStruct : mOutStructs) {
+			WRITE_FMT_LN(file, "struct %s {", declStruct.name.c_str());
+			// TODO
+			WRITE_LIT_LN(file, "};");
+		}
+
+		for (auto& declEnum : mOutEnums) {
+			// TODO
+		}
+
+		for (auto& declFunc : mOutFunctions) {
+			// TODO
+		}
+	}
+};
diff --git a/source/20-codegen-compiler/CodegenUtils.inl b/source/20-codegen-compiler/CodegenUtils.inl
new file mode 100644
index 0000000..6feb654
--- /dev/null
+++ b/source/20-codegen-compiler/CodegenUtils.inl
@@ -0,0 +1,106 @@
+#pragma once
+
+#include "CodegenConfig.hpp"
+#include "CodegenMacros.hpp"
+
+#include "CodegenOutput.inl"
+
+#include <Macros.hpp>
+#include <ScopeGuard.hpp>
+
+#include <cstdio>
+#include <cstdlib>
+#include <filesystem>
+
+namespace Utils {
+
+std::string ReadFileAsString(const std::filesystem::path& path) {
+	auto file = Utils::OpenCstdioFile(path, Utils::Read);
+	if (!file) throw std::runtime_error("Failed to open source file.");
+	DEFER { fclose(file); };
+
+	fseek(file, 0, SEEK_END);
+	auto fileSize = ftell(file);
+	rewind(file);
+
+	std::string result(fileSize, '\0');
+	fread(result.data(), fileSize, 1, file);
+
+	return result;
+}
+
+bool WriteOutputFile(const CodegenOutput& output, std::string_view dir, std::string_view filename, std::string_view additionalSuffix = {}) {
+	char path[2048];
+	snprintf(path, sizeof(path), "%.*s/%.*s%.*s", PRINTF_STRING_VIEW(dir), PRINTF_STRING_VIEW(filename), PRINTF_STRING_VIEW(additionalSuffix));
+
+	auto outputFile = Utils::OpenCstdioFile(path, Utils::WriteTruncate);
+	if (!outputFile) {
+		printf("[ERROR] unable to open output file %s\n", path);
+		return false;
+	}
+	DEFER { fclose(outputFile); };
+
+	DEBUG_PRINTF("Writing output %s\n", path);
+	output.Write(outputFile);
+
+	return true;
+}
+
+std::string MakeFullName(std::string_view name, DeclNamespace* ns = nullptr) {
+	size_t length = 0;
+	std::vector<std::string_view> components;
+	if (!name.empty()) {
+		components.push_back(name);
+		length += name.length();
+	}
+
+	DeclNamespace* currentNamespace = ns;
+	while (currentNamespace) {
+		components.push_back(currentNamespace->name);
+		length += currentNamespace->name.size() + /*::*/ 2;
+		currentNamespace = currentNamespace->container;
+	}
+
+	std::string fullname;
+	fullname.reserve(length);
+	for (auto it = components.rbegin(); it != components.rend(); ++it) {
+		fullname += *it;
+		fullname += "::";
+	}
+	// Get rid of the last "::"
+	fullname.pop_back();
+	fullname.pop_back();
+
+	return fullname;
+}
+
+void ProduceGeneratedHeaderFileHeader(CodegenOutput& output) {
+	output.AddOutputThing(CodegenOutputThing{
+		.text = &R"""(
+// This file is generated. Any changes will be overidden when building.
+#pragma once
+
+#include <MetadataBase.hpp>
+
+#include <cstddef>
+#include <cstdint>
+)"""[1],
+	});
+}
+
+void ProduceGeneratedSourceFileHeader(CodegenOutput& output) {
+	output.AddOutputThing(CodegenOutputThing{
+		// TODO we need to get the header name
+		.text = &R"""(
+// This file is generated. Any changes will be overidden when building.
+
+#include <cstddef>
+#include <cstdint>
+#include <frozen/string.h>
+#include <frozen/unordered_map.h>
+using namespace std::literals;
+		)"""[1],
+	});
+}
+
+} // namespace Utils
diff --git a/source/20-codegen-compiler/main.cpp b/source/20-codegen-compiler/main.cpp
new file mode 100644
index 0000000..b139515
--- /dev/null
+++ b/source/20-codegen-compiler/main.cpp
@@ -0,0 +1,761 @@
+#include "CodegenConfig.hpp"
+#include "CodegenDecl.hpp"
+#include "CodegenMacros.hpp"
+
+#include "CodegenInput.inl"
+#include "CodegenOutput.inl"
+#include "CodegenUtils.inl"
+
+#include <Enum.hpp>
+#include <LookupTable.hpp>
+#include <Macros.hpp>
+#include <ScopeGuard.hpp>
+#include <Utils.hpp>
+
+#include <frozen/string.h>
+#include <frozen/unordered_map.h>
+#include <robin_hood.h>
+#include <stb_c_lexer.h>
+#include <cinttypes>
+#include <cstdlib>
+#include <filesystem>
+#include <memory>
+#include <span>
+#include <string>
+#include <string_view>
+
+using namespace std::literals;
+namespace fs = std::filesystem;
+
+// TODO handle namespace
+// TODO support codegen target in .cpp files
+
+struct AppState {
+	std::string_view outputDir;
+	CodegenOutput mainHeaderOutput;
+	CodegenOutput mainSourceOutput;
+};
+
+enum {
+	CLEX_ext_single_char = CLEX_first_unused_token,
+	CLEX_ext_COUNT,
+};
+
+STR_LUT_DECL(ClexNames, CLEX_eof, CLEX_ext_COUNT) {
+	STR_LUT_MAP_FOR(ClexNames);
+	STR_LUT_MAP_ENUM(CLEX_intlit);
+	STR_LUT_MAP_ENUM(CLEX_floatlit);
+	STR_LUT_MAP_ENUM(CLEX_id);
+	STR_LUT_MAP_ENUM(CLEX_dqstring);
+	STR_LUT_MAP_ENUM(CLEX_sqstring);
+	STR_LUT_MAP_ENUM(CLEX_charlit);
+	STR_LUT_MAP_ENUM(CLEX_eq);
+	STR_LUT_MAP_ENUM(CLEX_noteq);
+	STR_LUT_MAP_ENUM(CLEX_lesseq);
+	STR_LUT_MAP_ENUM(CLEX_greatereq);
+	STR_LUT_MAP_ENUM(CLEX_andand);
+	STR_LUT_MAP_ENUM(CLEX_oror);
+	STR_LUT_MAP_ENUM(CLEX_shl);
+	STR_LUT_MAP_ENUM(CLEX_shr);
+	STR_LUT_MAP_ENUM(CLEX_plusplus);
+	STR_LUT_MAP_ENUM(CLEX_minusminus);
+	STR_LUT_MAP_ENUM(CLEX_pluseq);
+	STR_LUT_MAP_ENUM(CLEX_minuseq);
+	STR_LUT_MAP_ENUM(CLEX_muleq);
+	STR_LUT_MAP_ENUM(CLEX_diveq);
+	STR_LUT_MAP_ENUM(CLEX_modeq);
+	STR_LUT_MAP_ENUM(CLEX_andeq);
+	STR_LUT_MAP_ENUM(CLEX_oreq);
+	STR_LUT_MAP_ENUM(CLEX_xoreq);
+	STR_LUT_MAP_ENUM(CLEX_arrow);
+	STR_LUT_MAP_ENUM(CLEX_eqarrow);
+	STR_LUT_MAP_ENUM(CLEX_shleq);
+	STR_LUT_MAP_ENUM(CLEX_shreq);
+	STR_LUT_MAP_ENUM(CLEX_ext_single_char);
+}
+
+enum CppKeyword {
+	CKw_Namespace,
+	CKw_Struct,
+	CKw_Class,
+	CKw_Enum,
+	CKw_COUNT,
+};
+
+BSTR_LUT_DECL(CppKeyword, 0, CKw_COUNT) {
+	BSTR_LUT_MAP_FOR(CppKeyword);
+	BSTR_LUT_MAP(CKw_Namespace, "namespace");
+	BSTR_LUT_MAP(CKw_Struct, "struct");
+	BSTR_LUT_MAP(CKw_Class, "class");
+	BSTR_LUT_MAP(CKw_Enum, "enum");
+}
+
+enum CodegenDirective {
+	CD_ClassInfo,
+	CD_EnumInfo,
+	CD_COUNT,
+};
+
+BSTR_LUT_DECL(CodegenDirective, 0, CD_COUNT) {
+	BSTR_LUT_MAP_FOR(CodegenDirective);
+	BSTR_LUT_MAP(CD_ClassInfo, "BRUSSEL_CLASS");
+	BSTR_LUT_MAP(CD_EnumInfo, "BRUSSEL_ENUM");
+}
+
+struct StbLexerToken {
+	std::string text;
+	// Can either be CLEX_* or CLEX_ext_* values
+	int type;
+};
+
+bool StbTokenIsSingleChar(int lexerToken) {
+	return lexerToken >= 0 && lexerToken < 256;
+}
+
+bool StbTokenIsMultiChar(int lexerToken) {
+	return !StbTokenIsMultiChar(lexerToken);
+}
+
+void CheckBraceDepth(int braceDpeth) {
+	if (braceDpeth < 0) {
+		printf("[WARNING] unbalanced brace\n");
+	}
+}
+
+const StbLexerToken*
+PeekTokenOfTypeAt(const std::vector<StbLexerToken>& tokens, size_t idx, int type) {
+	auto& token = tokens[idx];
+	if (token.type != type) {
+		return nullptr;
+	}
+
+	return &token;
+}
+
+std::pair<const StbLexerToken*, size_t>
+PeekTokenOfType(const std::vector<StbLexerToken>& tokens, size_t current, int type) {
+	for (size_t i = current; i < tokens.size(); ++i) {
+		if (auto token = PeekTokenOfTypeAt(tokens, i, type)) {
+			return { token, i };
+		}
+	}
+	return { nullptr, current };
+}
+
+std::pair<std::vector<std::vector<const StbLexerToken*>>, size_t>
+PeekDirectiveArgumentList(const std::vector<StbLexerToken>& tokens, size_t current) {
+	std::vector<std::vector<const StbLexerToken*>> result;
+	decltype(result)::value_type currentArg;
+
+	size_t i = current;
+	int parenDepth = 0;
+	for (; i < tokens.size(); ++i) {
+		auto& token = tokens[i];
+		if (token.text[0] == '(') {
+			if (parenDepth > 0) {
+				currentArg.push_back(&token);
+			}
+			++parenDepth;
+		} else if (token.text[0] == ')') {
+			--parenDepth;
+			if (parenDepth == 0) {
+				// End of argument  list
+				break;
+			}
+		} else if (parenDepth > 0) {
+			// Parse these only if we are inside the argument list
+			if (token.text[0] == ',') {
+				result.push_back(std::move(currentArg));
+				currentArg = {};
+			} else {
+				currentArg.push_back(&token);
+			}
+		}
+	}
+
+	if (!currentArg.empty()) {
+		result.push_back(std::move(currentArg));
+	}
+
+	return { result, i };
+}
+
+std::vector<StbLexerToken> RecordTokens(std::string_view source) {
+	stb_lexer lexer;
+	char stringStorage[65536];
+	const char* srcBegin = source.data();
+	const char* srcEnd = srcBegin + source.length();
+	stb_c_lexer_init(&lexer, srcBegin, srcEnd, stringStorage, sizeof(stringStorage));
+
+	std::vector<StbLexerToken> tokens;
+	while (true) {
+		// See stb_c_lexer.h's comments, here are a few additinos that aren't made clear in the file:
+		// - `lexer->token` (noted as "token" below) after calling stb_c_lexer_get_token() contains either:
+		//     1. 0 <= token < 256:          an ASCII character (more precisely a single char that the lexer ate; technically can be an incomplete code unit)
+		//     2. token < 0:                 an unknown token
+		//     3. One of the `CLEX_*` enums: a special, recognized token such as an operator
+
+		int stbToken = stb_c_lexer_get_token(&lexer);
+		if (stbToken == 0) {
+			// EOF
+			break;
+		}
+
+		if (lexer.token == CLEX_parse_error) {
+			printf("[ERROR] stb_c_lexer countered a parse error.\n");
+			// TODO how to handle?
+			continue;
+		}
+
+		StbLexerToken token;
+		if (StbTokenIsSingleChar(lexer.token)) {
+			token.type = CLEX_ext_single_char;
+			token.text = std::string(1, lexer.token);
+		} else {
+			token.type = lexer.token;
+			// WORKAROUND: use null terminated string, stb_c_lexer doens't set string_len properly when parsing identifiers
+			token.text = std::string(lexer.string);
+		}
+		tokens.push_back(std::move(token));
+		token = {};
+	}
+	return tokens;
+}
+
+enum StructMetaGenOptions {
+	SMGO_InheritanceHiearchy,
+	SMGO_PublicFields,
+	SMGO_ProtectedFields,
+	SMGO_PrivateFields,
+	SMGO_COUNT,
+};
+
+BSTR_LUT_DECL(StructMetaGenOptions, 0, SMGO_COUNT) {
+	BSTR_LUT_MAP_FOR(StructMetaGenOptions);
+	BSTR_LUT_MAP(SMGO_InheritanceHiearchy, "GenInheritanceHiearchy");
+	BSTR_LUT_MAP(SMGO_PublicFields, "GenPublicFields");
+	BSTR_LUT_MAP(SMGO_ProtectedFields, "GenProtectedFields");
+	BSTR_LUT_MAP(SMGO_PrivateFields, "GenPrivateFields");
+}
+
+enum EnumMetaGenOptions {
+	EMGO_ToString,
+	EMGO_FromString,
+	EMGO_ExcludeUseHeuristics,
+	EMGO_COUNT,
+};
+
+BSTR_LUT_DECL(EnumMetaGenOptions, 0, EMGO_COUNT) {
+	BSTR_LUT_MAP_FOR(EnumMetaGenOptions);
+	BSTR_LUT_MAP(EMGO_ToString, "ToString");
+	BSTR_LUT_MAP(EMGO_FromString, "FromString");
+	BSTR_LUT_MAP(EMGO_ExcludeUseHeuristics, "ExcludeHeuristics");
+}
+
+std::string GenerateEnumStringArray(CodegenOutput& out, const DeclEnum& decl, bool useHeruistics) {
+	std::string arrayName;
+	APPEND_FMT(arrayName, "gCG_%s_Val2Str", decl.name.c_str());
+
+	CodegenOutputThing thing;
+	APPEND_FMT_LN(thing.text, "const char* %s[] = {", arrayName.c_str());
+	for (auto& elm : decl.elements) {
+		if (useHeruistics && elm.name.ends_with("COUNT")) {
+			continue;
+		}
+
+		APPEND_FMT_LN(thing.text, "\"%s\",", elm.name.c_str());
+	}
+	APPEND_LIT_LN(thing.text, "};");
+	out.AddOutputThing(std::move(thing));
+
+	return arrayName;
+}
+
+std::string GenerateEnumStringMap(CodegenOutput& out, const DeclEnum& decl, bool useHeruistics) {
+	std::string mapName;
+	// TODO
+
+	return mapName;
+}
+
+void GenerateForEnum(CodegenOutput& headerOut, CodegenOutput& sourceOut, const DeclEnum& decl, EnumFlags<EnumMetaGenOptions> options) {
+	char enumName[2048];
+	if (decl.container) {
+		snprintf(enumName, sizeof(enumName), "%.*s::%s", PRINTF_STRING_VIEW(decl.container->fullname), decl.name.c_str());
+	} else {
+		strncpy(enumName, decl.name.c_str(), sizeof(enumName));
+	}
+
+	auto useExcludeHeuristics = options.IsSet(EMGO_ExcludeUseHeuristics);
+	auto filteredElements = [&]() {
+		if (useExcludeHeuristics) {
+			decltype(decl.elements) result;
+			for (auto& elm : decl.elements) {
+				if (elm.name.ends_with("COUNT")) continue;
+
+				result.push_back(elm);
+			}
+			return result;
+		} else {
+			return decl.elements;
+		}
+	}();
+
+	if (options.IsSet(EMGO_ToString)) {
+		// Generate value -> string lookup table and function
+
+		switch (decl.GetPattern()) {
+			case EVP_Continuous: {
+				auto arrayName = GenerateEnumStringArray(sourceOut, decl, useExcludeHeuristics);
+				int minVal = filteredElements.empty() ? 0 : filteredElements.front().value;
+				int maxVal = filteredElements.empty() ? 0 : filteredElements.back().value;
+
+				CodegenOutputThing lookupFunctionDef;
+				{
+					auto& o = lookupFunctionDef.text;
+					APPEND_LIT_LN(o, "template <>");
+					APPEND_FMT_LN(o, "std::string_view Metadata::EnumToString<%s>(%s value) {", enumName, enumName);
+					APPEND_FMT_LN(o, "    if (value < %d || value > %d) return {};", minVal, maxVal);
+					APPEND_FMT_LN(o, "    return %s[value - %d];", arrayName.c_str(), minVal);
+					APPEND_LIT_LN(o, "}");
+				}
+
+				sourceOut.AddOutputThing(std::move(lookupFunctionDef));
+			} break;
+
+			case EVP_Bits: {
+				auto arrayName = GenerateEnumStringArray(sourceOut, decl, useExcludeHeuristics);
+				// TODO
+			} break;
+
+			case EVP_Random: {
+				auto mapName = GenerateEnumStringMap(sourceOut, decl, useExcludeHeuristics);
+				// TODO
+			} break;
+
+			case EVP_COUNT: break;
+		}
+	}
+
+	if (options.IsSet(EMGO_FromString)) {
+		// Generate string -> value lookup table
+		char mapName[1024];
+		// TODO mangle to prevent name conflicts of enum in different namespaces
+		snprintf(mapName, sizeof(mapName), "gCG_%s_Str2Val", decl.name.c_str());
+
+		CodegenOutputThing lookupTable;
+		{
+			auto& o = lookupTable.text;
+			// TODO use correct underlying type
+			APPEND_FMT_LN(o, "constinit frozen::unordered_map<frozen::string, uint64_t, %" PRId64 "> %s = {", filteredElements.size(), mapName);
+			for (auto& elm : filteredElements) {
+				APPEND_FMT_LN(o, "{\"%s\", %" PRId64 "},", elm.name.c_str(), elm.value);
+			}
+			APPEND_LIT_LN(o, "};");
+		}
+
+		// Generate lookup function
+		CodegenOutputThing lookupFunctionDef;
+		{
+			auto& o = lookupFunctionDef.text;
+			APPEND_LIT_LN(o, "template <>");
+			APPEND_FMT_LN(o, "std::optional<%s> Metadata::EnumFromString<%s>(std::string_view value) {", enumName, enumName);
+			APPEND_FMT_LN(o, "    auto iter = %s.find(value);", mapName);
+			APPEND_FMT_LN(o, "    if (iter != %s.end()) {", mapName);
+			APPEND_FMT_LN(o, "        return (%s)iter->second;", enumName);
+			APPEND_LIT_LN(o, "    } else {");
+			APPEND_LIT_LN(o, "        return {};");
+			APPEND_LIT_LN(o, "    }");
+			APPEND_LIT_LN(o, "}");
+		}
+
+		sourceOut.AddOutputThing(std::move(lookupTable));
+		sourceOut.AddOutputThing(std::move(lookupFunctionDef));
+	}
+}
+
+void HandleInputFile(AppState& state, std::string_view filenameStem, std::string_view source) {
+	auto tokens = RecordTokens(source);
+	size_t idx = 0;
+
+#if CODEGEN_DEBUG_PRINT
+	printf("BEGIN tokens\n");
+	for (auto& token : tokens) {
+		printf("  token %-32s '%s'\n", STR_LUT_LOOKUP(ClexNames, token.type), token.text.c_str());
+	}
+	printf("END tokens\n");
+#endif
+
+	CodegenInput cgInput;
+	CodegenOutput cgHeaderOutput;
+	Utils::ProduceGeneratedHeaderFileHeader(cgHeaderOutput);
+	CodegenOutput cgSourceOutput;
+	Utils::ProduceGeneratedSourceFileHeader(cgSourceOutput);
+
+	int currentBraceDepth = 0;
+	// The current effective namespace, see example
+	DeclNamespace* currentNamespace = nullptr;
+
+	struct NamespaceStackframe {
+		// The current namespace that owns the brace level, see example
+		DeclNamespace* ns = nullptr;
+		// Brace depth `ns` was created at (e.g. [std::details].depth == 0)
+		int depth = 0;
+	};
+	std::vector<NamespaceStackframe> nsStack;
+
+	// Example:
+	// namespace std::details {
+	//   /* [stack top].ns = std::details */
+	//   /* [stack top].depth = std */
+	// }
+	// namespace foo {
+	//   /* [stack top].ns = foo */
+	//   /* [stack top].depth = foo */
+	// namespace details {
+	//   /* [stack top].ns = foo::details */
+	//   /* [stack top].depth = foo::details */
+	// }
+	// }
+
+	while (idx < tokens.size()) {
+		auto& token = tokens[idx];
+
+		bool incrementTokenIdx = true;
+
+		switch (token.type) {
+			case CLEX_id: {
+				CppKeyword keyword;
+				{
+					auto& map = BSTR_LUT_S2V(CppKeyword);
+					auto iter = map.find(token.text);
+					if (iter != map.end()) {
+						keyword = iter->second;
+					} else {
+						keyword = CKw_COUNT; // Skip keyword section
+					}
+				}
+				switch (keyword) {
+					case CKw_Namespace: {
+						++idx;
+						incrementTokenIdx = false;
+
+						while (true) {
+							if (tokens[idx].type != CLEX_id) {
+								// TODO better error recovery
+								printf("[ERROR] invalid syntax for namespace\n");
+								break;
+							}
+
+							currentNamespace = cgInput.AddNamespace(DeclNamespace{
+								.container = currentNamespace,
+								.name = tokens[idx].text,
+							});
+
+							if (tokens[idx + 1].text[0] == ':' &&
+								tokens[idx + 2].text[0] == ':')
+							{
+								// Skip the two ':' tokens, try parse the next identifier
+								idx += 3;
+							} else {
+								break;
+							}
+						}
+
+						nsStack.push_back(NamespaceStackframe{
+							.ns = currentNamespace,
+							.depth = currentBraceDepth,
+						});
+
+						goto endIdenCase;
+					}
+
+					case CKw_Struct:
+					case CKw_Class: {
+						auto& idenTok = tokens[idx + 1]; // TODO handle end of list
+						DEBUG_PRINTF("[DEBUG] found struct named %s\n", idenTok.text.c_str());
+						goto endIdenCase;
+					}
+
+					case CKw_Enum: {
+						// Consume the "enum" keyword
+						++idx;
+						incrementTokenIdx = false;
+
+						DeclEnum enumDecl;
+						enumDecl.container = currentNamespace;
+						enumDecl.underlyingType = EUT_Int32; // TODO
+
+						if (tokens[idx].text == "class") {
+							// Consume the "class" keyword
+							++idx;
+							DEBUG_PRINTF("[DEBUG] found enum class named %s\n", tokens[idx].text.c_str());
+						} else {
+							DEBUG_PRINTF("[DEBUG] found enum named %s\n", tokens[idx].text.c_str());
+						}
+
+						// Consume the enum name identifier
+						enumDecl.name = tokens[idx].text;
+						++idx;
+
+						int enumClosingBraceCount = 0;
+						int enumBraceDepth = 0;
+						while (enumClosingBraceCount == 0 && idx < tokens.size()) {
+							auto& token = tokens[idx];
+							switch (token.type) {
+								case CLEX_id: {
+									auto& vec = enumDecl.elements;
+									// Set to the previous enum element's value + 1, or starting from 0 if this is the first
+									// Also overridden in the CLEX_intlit branch
+									auto value = vec.empty() ? 0 : vec.back().value + 1;
+									vec.push_back(DeclEnumElement{
+										.name = token.text,
+										.value = value,
+									});
+								} break;
+
+								case CLEX_intlit: {
+
+								} break;
+
+								case CLEX_ext_single_char: {
+									switch (token.text[0]) {
+										case '{': {
+											++enumBraceDepth;
+										} break;
+
+										case '}': {
+											--enumBraceDepth;
+											++enumClosingBraceCount;
+										} break;
+									}
+								} break;
+							}
+
+							++idx;
+						}
+
+						auto fullname = Utils::MakeFullName(enumDecl.name, currentNamespace);
+						cgInput.AddEnum(std::move(fullname), std::move(enumDecl));
+						goto endIdenCase;
+					}
+
+					case CKw_COUNT: break;
+				}
+
+				CodegenDirective directive;
+				{
+					auto& map = BSTR_LUT_S2V(CodegenDirective);
+					auto iter = map.find(token.text);
+					if (iter != map.end()) {
+						directive = iter->second;
+					} else {
+						directive = CD_COUNT; // Skip directive section
+					}
+				}
+				switch (directive) {
+					case CD_ClassInfo: {
+						// TODO
+						goto endIdenCase;
+					}
+
+					case CD_EnumInfo: {
+						// Consume the directive
+						++idx;
+						incrementTokenIdx = false;
+
+						auto& optionsStrMap = BSTR_LUT_S2V(EnumMetaGenOptions);
+						auto [argList, newIdx] = PeekDirectiveArgumentList(tokens, idx);
+						if (argList.size() < 1) {
+							printf("[ERROR] invalid syntax for BRUSSEL_ENUM\n");
+							break; // TODO handle this error case gracefully (advance to semicolon?)
+						}
+
+						auto& enumName = argList[0][0]->text;
+						auto enumDecl = cgInput.FindEnumByName(Utils::MakeFullName(enumName, currentNamespace));
+						if (!enumDecl) {
+							printf("[ERROR] BRUSSEL_ENUM: referring to non-existent enum '%s'\n", enumName.c_str());
+							break;
+						}
+
+						auto& directiveOptions = argList[1];
+						EnumFlags<EnumMetaGenOptions> options;
+						for (auto optionTok : directiveOptions) {
+							auto iter = optionsStrMap.find(optionTok->text);
+							if (iter != optionsStrMap.end()) {
+								options |= iter->second;
+							} else {
+								printf("[ERROR] BRUSSEL_ENUM: invalid option '%s'\n", optionTok->text.c_str());
+							}
+						}
+
+						GenerateForEnum(cgHeaderOutput, cgSourceOutput, *enumDecl, options);
+
+						idx = newIdx;
+						incrementTokenIdx = false;
+						goto endIdenCase;
+					}
+
+					case CD_COUNT: break;
+				}
+
+			endIdenCase:
+				break;
+			}
+
+			case CLEX_ext_single_char:
+				switch (token.text[0]) {
+					case '{': {
+						currentBraceDepth++;
+						CheckBraceDepth(currentBraceDepth);
+					} break;
+
+					case '}': {
+						currentBraceDepth--;
+						CheckBraceDepth(currentBraceDepth);
+
+						if (!nsStack.empty()) {
+							auto& ns = nsStack.back();
+							if (ns.depth == currentBraceDepth) {
+								nsStack.pop_back();
+
+								if (!nsStack.empty()) {
+									currentNamespace = nsStack.back().ns;
+								} else {
+									currentNamespace = nullptr;
+								}
+							}
+						}
+					} break;
+				}
+				break;
+		}
+
+		if (incrementTokenIdx) {
+			++idx;
+		}
+	}
+
+	if (currentBraceDepth != 0) {
+		printf("[WARNING] unbalanced brace at end of file.");
+	}
+
+	Utils::WriteOutputFile(cgHeaderOutput, state.outputDir, filenameStem, ".gh.inl"sv);
+	Utils::WriteOutputFile(cgSourceOutput, state.outputDir, filenameStem, ".gs.inl"sv);
+
+	// TODO see CMakeLists.txt for rationale, clean this up to be a proper citizen
+	Utils::WriteOutputFile(CodegenOutput{}, state.outputDir, filenameStem, ".gs.cpp"sv);
+}
+
+enum InputOpcode {
+	IOP_ProcessSingleFile,
+	IOP_ProcessRecursively,
+	IOP_COUNT,
+};
+
+void HandleArgument(AppState& state, InputOpcode opcode, std::string_view operand) {
+	switch (opcode) {
+		case IOP_ProcessSingleFile: {
+			DEBUG_PRINTF("Processing single file %.*s\n", PRINTF_STRING_VIEW(operand));
+
+			fs::path path(operand);
+			auto filenameStem = path.stem().string();
+			auto source = Utils::ReadFileAsString(path);
+			HandleInputFile(state, filenameStem, source);
+		} break;
+
+		case IOP_ProcessRecursively: {
+			DEBUG_PRINTF("Recursively processing folder %.*s\n", PRINTF_STRING_VIEW(operand));
+
+			fs::path startPath(operand);
+			for (auto& item : fs::recursive_directory_iterator(startPath)) {
+				if (!item.is_regular_file()) {
+					continue;
+				}
+
+				auto& path = item.path();
+				auto pathExt = path.extension();
+				auto pathStem = path.stem();
+				if (pathExt != ".h" &&
+					pathExt != ".hpp")
+				{
+					continue;
+				}
+
+				DEBUG_PRINTF("Processing subfile %s\n", path.string().c_str());
+
+				auto filenameStem = pathStem.string();
+				auto source = Utils::ReadFileAsString(path);
+				HandleInputFile(state, filenameStem, source);
+			}
+		} break;
+
+		case IOP_COUNT: break;
+	}
+}
+
+InputOpcode ParseInputOpcode(std::string_view text) {
+	if (text == "single"sv) {
+		return IOP_ProcessSingleFile;
+	} else if (text == "rec"sv) {
+		return IOP_ProcessRecursively;
+	} else {
+		DEBUG_PRINTF("Unknown input opcode %s\n", text.data());
+		throw std::runtime_error("Unknown input opcode");
+	}
+}
+
+int main(int argc, char* argv[]) {
+	STR_LUT_INIT(ClexNames);
+	BSTR_LUT_INIT(CppKeyword);
+	BSTR_LUT_INIT(CodegenDirective);
+	BSTR_LUT_INIT(StructMetaGenOptions);
+	BSTR_LUT_INIT(EnumMetaGenOptions);
+
+	// TODO better arg parser
+	//      option 1: use cxxopts and positional arguments
+	//      option 2: take one argument only, being a json objecet
+
+	AppState state;
+
+	Utils::ProduceGeneratedHeaderFileHeader(state.mainHeaderOutput);
+	Utils::ProduceGeneratedSourceFileHeader(state.mainSourceOutput);
+
+	// If no cli is provided (argv[0] conventionally but not mandatorily the cli), this will do thing
+	// Otherwise, start with the 2nd element in the array, which is the 1st actual argument
+	if (argc < 2) {
+		// NOTE: keep in sync with various enum options and parser code
+		printf(&R"""(
+USAGE: codegen.exe <output path> [<opcode>:<input path>]...
+where   <output path>: the directory to write generated contents to. This will NOT automatically create the directory.
+        <opcode> is one of:
+            "single" process this <input path> file only
+            "rec" starting at the given directory <input path>, recursively process all .h .hpp files
+)"""[1]);
+		return -1;
+	}
+
+	state.outputDir = std::string_view(argv[1]);
+	DEBUG_PRINTF("Outputting to directory %.*s.\n", PRINTF_STRING_VIEW(state.outputDir));
+
+	for (int i = 2; i < argc; ++i) {
+		const char* argRaw = argv[i];
+		std::string_view arg(argRaw);
+		DEBUG_PRINTF("Processing input command %s\n", argRaw);
+
+		auto separatorLoc = arg.find(':');
+		if (separatorLoc != std::string_view::npos) {
+			auto opcodeString = arg.substr(0, separatorLoc);
+			auto opcode = ParseInputOpcode(opcodeString);
+			auto operand = arg.substr(separatorLoc + 1);
+
+			HandleArgument(state, opcode, operand);
+		}
+	}
+
+	// TODO do we even need these?
+	// Utils::WriteOutputFile(state.mainHeaderOutput, state.outputDir, "GeneratedCode.hpp"sv);
+	// Utils::WriteOutputFile(state.mainSourceOutput, state.outputDir, "GeneratedCode.cpp"sv);
+
+	return 0;
+}
diff --git a/source/20-codegen-compiler/test/examples/TestEnum.hpp.txt b/source/20-codegen-compiler/test/examples/TestEnum.hpp.txt
new file mode 100644
index 0000000..441d97c
--- /dev/null
+++ b/source/20-codegen-compiler/test/examples/TestEnum.hpp.txt
@@ -0,0 +1,43 @@
+enum MyEnum {
+	EnumElement1,
+	EnumElement2,
+	EnumElement3,
+};
+BRUSSEL_ENUM(MyEnum, ToString FromString);
+
+enum CountedEnumAll {
+	CEA_Foo,
+	CEA_Bar,
+	CEA_COUNT,
+};
+BRUSSEL_ENUM(CountedEnumAll, ToString FromString);
+
+enum CountedEnum {
+	CE_Foo,
+	CE_Bar,
+	CE_FooBar,
+	CE_COUNT,
+};
+BRUSSEL_ENUM(CountedEnum, ToString FromString ExcludeHeuristics);
+
+namespace MyNamespace {
+enum MyNamespacedEnum {
+	MNE_Foo,
+	MNE_Bar,
+};
+BRUSSEL_ENUM(MyNamespacedEnum, ToString FromString ExcludeHeuristics);
+
+namespace details {
+	enum MyNamespacedEnum {
+		MNE_Foo,
+		MNE_Bar,
+	};
+	BRUSSEL_ENUM(MyNamespacedEnum, ToString FromString ExcludeHeuristics);
+}
+}
+
+namespace foo::details {
+enum Enum {
+};
+BRUSSEL_ENUM(Enum, ToString FromString ExcludeHeuristics);
+}
diff --git a/source/20-codegen-runtime/MacrosCodegen.hpp b/source/20-codegen-runtime/MacrosCodegen.hpp
new file mode 100644
index 0000000..6803023
--- /dev/null
+++ b/source/20-codegen-runtime/MacrosCodegen.hpp
@@ -0,0 +1,7 @@
+// NOTE: contents of this file is coupled with buildtools/codegen/
+// when updating, change both sides at the same time
+
+#pragma once
+
+#define BRUSSEL_CLASS(name, options)
+#define BRUSSEL_ENUM(name, options)
diff --git a/source/20-codegen-runtime/Metadata.cpp b/source/20-codegen-runtime/Metadata.cpp
new file mode 100644
index 0000000..ee32054
--- /dev/null
+++ b/source/20-codegen-runtime/Metadata.cpp
@@ -0,0 +1 @@
+#include "Metadata.hpp"
diff --git a/source/20-codegen-runtime/Metadata.hpp b/source/20-codegen-runtime/Metadata.hpp
new file mode 100644
index 0000000..a038c15
--- /dev/null
+++ b/source/20-codegen-runtime/Metadata.hpp
@@ -0,0 +1,4 @@
+#pragma once
+
+#include "MacrosCodegen.hpp"
+#include "MetadataBase.hpp"
diff --git a/source/20-codegen-runtime/MetadataBase.cpp b/source/20-codegen-runtime/MetadataBase.cpp
new file mode 100644
index 0000000..3ccf870
--- /dev/null
+++ b/source/20-codegen-runtime/MetadataBase.cpp
@@ -0,0 +1 @@
+#include "MetadataBase.hpp"
diff --git a/source/20-codegen-runtime/MetadataBase.hpp b/source/20-codegen-runtime/MetadataBase.hpp
new file mode 100644
index 0000000..8be668d
--- /dev/null
+++ b/source/20-codegen-runtime/MetadataBase.hpp
@@ -0,0 +1,14 @@
+#pragma once
+
+#include <optional>
+#include <string_view>
+
+namespace Metadata {
+
+template <class TEnum>
+std::string_view EnumToString(TEnum value);
+
+template <class TEnum>
+std::optional<TEnum> EnumFromString(std::string_view str);
+
+} // namespace Metadata
diff --git a/source/App.cpp b/source/30-game/App.cpp
index 45a7545..45a7545 100644
--- a/source/App.cpp
+++ b/source/30-game/App.cpp
diff --git a/source/App.hpp b/source/30-game/App.hpp
index c73c5a1..c73c5a1 100644
--- a/source/App.hpp
+++ b/source/30-game/App.hpp
diff --git a/source/AppConfig.hpp b/source/30-game/AppConfig.hpp
index 794bee5..794bee5 100644
--- a/source/AppConfig.hpp
+++ b/source/30-game/AppConfig.hpp
diff --git a/source/Camera.cpp b/source/30-game/Camera.cpp
index 39f0369..39f0369 100644
--- a/source/Camera.cpp
+++ b/source/30-game/Camera.cpp
diff --git a/source/Camera.hpp b/source/30-game/Camera.hpp
index 7bf0a6c..7bf0a6c 100644
--- a/source/Camera.hpp
+++ b/source/30-game/Camera.hpp
diff --git a/source/CommonVertexIndex.cpp b/source/30-game/CommonVertexIndex.cpp
index 786274e..786274e 100644
--- a/source/CommonVertexIndex.cpp
+++ b/source/30-game/CommonVertexIndex.cpp
diff --git a/source/CommonVertexIndex.hpp b/source/30-game/CommonVertexIndex.hpp
index adb81b6..adb81b6 100644
--- a/source/CommonVertexIndex.hpp
+++ b/source/30-game/CommonVertexIndex.hpp
diff --git a/source/EditorAccessories.cpp b/source/30-game/EditorAccessories.cpp
index 08d08ec..08d08ec 100644
--- a/source/EditorAccessories.cpp
+++ b/source/30-game/EditorAccessories.cpp
diff --git a/source/EditorAccessories.hpp b/source/30-game/EditorAccessories.hpp
index 687b509..687b509 100644
--- a/source/EditorAccessories.hpp
+++ b/source/30-game/EditorAccessories.hpp
diff --git a/source/EditorAttachment.hpp b/source/30-game/EditorAttachment.hpp
index 61b824b..61b824b 100644
--- a/source/EditorAttachment.hpp
+++ b/source/30-game/EditorAttachment.hpp
diff --git a/source/EditorAttachmentImpl.cpp b/source/30-game/EditorAttachmentImpl.cpp
index 62d15eb..62d15eb 100644
--- a/source/EditorAttachmentImpl.cpp
+++ b/source/30-game/EditorAttachmentImpl.cpp
diff --git a/source/EditorAttachmentImpl.hpp b/source/30-game/EditorAttachmentImpl.hpp
index 53bcd37..53bcd37 100644
--- a/source/EditorAttachmentImpl.hpp
+++ b/source/30-game/EditorAttachmentImpl.hpp
diff --git a/source/EditorCommandPalette.cpp b/source/30-game/EditorCommandPalette.cpp
index 0e7b894..0e7b894 100644
--- a/source/EditorCommandPalette.cpp
+++ b/source/30-game/EditorCommandPalette.cpp
diff --git a/source/EditorCommandPalette.hpp b/source/30-game/EditorCommandPalette.hpp
index 101344d..101344d 100644
--- a/source/EditorCommandPalette.hpp
+++ b/source/30-game/EditorCommandPalette.hpp
diff --git a/source/EditorCore.hpp b/source/30-game/EditorCore.hpp
index 726f43e..726f43e 100644
--- a/source/EditorCore.hpp
+++ b/source/30-game/EditorCore.hpp
diff --git a/source/EditorCorePrivate.cpp b/source/30-game/EditorCorePrivate.cpp
index 9fd6087..9fd6087 100644
--- a/source/EditorCorePrivate.cpp
+++ b/source/30-game/EditorCorePrivate.cpp
diff --git a/source/EditorCorePrivate.hpp b/source/30-game/EditorCorePrivate.hpp
index 4fbfb72..4fbfb72 100644
--- a/source/EditorCorePrivate.hpp
+++ b/source/30-game/EditorCorePrivate.hpp
diff --git a/source/EditorGuizmo.cpp b/source/30-game/EditorGuizmo.cpp
index 3e4f890..3e4f890 100644
--- a/source/EditorGuizmo.cpp
+++ b/source/30-game/EditorGuizmo.cpp
diff --git a/source/EditorGuizmo.hpp b/source/30-game/EditorGuizmo.hpp
index 0560050..0560050 100644
--- a/source/EditorGuizmo.hpp
+++ b/source/30-game/EditorGuizmo.hpp
diff --git a/source/EditorNotification.cpp b/source/30-game/EditorNotification.cpp
index e4a869e..e4a869e 100644
--- a/source/EditorNotification.cpp
+++ b/source/30-game/EditorNotification.cpp
diff --git a/source/EditorNotification.hpp b/source/30-game/EditorNotification.hpp
index 3af8c2d..3af8c2d 100644
--- a/source/EditorNotification.hpp
+++ b/source/30-game/EditorNotification.hpp
diff --git a/source/EditorUtils.cpp b/source/30-game/EditorUtils.cpp
index 20caef7..20caef7 100644
--- a/source/EditorUtils.cpp
+++ b/source/30-game/EditorUtils.cpp
diff --git a/source/EditorUtils.hpp b/source/30-game/EditorUtils.hpp
index 99c522b..99c522b 100644
--- a/source/EditorUtils.hpp
+++ b/source/30-game/EditorUtils.hpp
diff --git a/source/FuzzyMatch.cpp b/source/30-game/FuzzyMatch.cpp
index 0ab604d..0ab604d 100644
--- a/source/FuzzyMatch.cpp
+++ b/source/30-game/FuzzyMatch.cpp
diff --git a/source/FuzzyMatch.hpp b/source/30-game/FuzzyMatch.hpp
index 7a26b7e..7a26b7e 100644
--- a/source/FuzzyMatch.hpp
+++ b/source/30-game/FuzzyMatch.hpp
diff --git a/source/GameObject.cpp b/source/30-game/GameObject.cpp
index 8bb3ec7..8bb3ec7 100644
--- a/source/GameObject.cpp
+++ b/source/30-game/GameObject.cpp
diff --git a/source/GameObject.hpp b/source/30-game/GameObject.hpp
index 77488b9..77488b9 100644
--- a/source/GameObject.hpp
+++ b/source/30-game/GameObject.hpp
diff --git a/source/GraphicsTags.cpp b/source/30-game/GraphicsTags.cpp
index 522a58f..522a58f 100644
--- a/source/GraphicsTags.cpp
+++ b/source/30-game/GraphicsTags.cpp
diff --git a/source/GraphicsTags.hpp b/source/30-game/GraphicsTags.hpp
index f83b99c..f83b99c 100644
--- a/source/GraphicsTags.hpp
+++ b/source/30-game/GraphicsTags.hpp
diff --git a/source/Image.cpp b/source/30-game/Image.cpp
index 3673acc..3673acc 100644
--- a/source/Image.cpp
+++ b/source/30-game/Image.cpp
diff --git a/source/Image.hpp b/source/30-game/Image.hpp
index c577c24..c577c24 100644
--- a/source/Image.hpp
+++ b/source/30-game/Image.hpp
diff --git a/source/Ires.cpp b/source/30-game/Ires.cpp
index 10a6867..10a6867 100644
--- a/source/Ires.cpp
+++ b/source/30-game/Ires.cpp
diff --git a/source/Ires.hpp b/source/30-game/Ires.hpp
index 83ca175..83ca175 100644
--- a/source/Ires.hpp
+++ b/source/30-game/Ires.hpp
diff --git a/source/Level.cpp b/source/30-game/Level.cpp
index 5881084..5881084 100644
--- a/source/Level.cpp
+++ b/source/30-game/Level.cpp
diff --git a/source/Level.hpp b/source/30-game/Level.hpp
index c1170a3..c1170a3 100644
--- a/source/Level.hpp
+++ b/source/30-game/Level.hpp
diff --git a/source/Material.cpp b/source/30-game/Material.cpp
index e648970..e648970 100644
--- a/source/Material.cpp
+++ b/source/30-game/Material.cpp
diff --git a/source/Material.hpp b/source/30-game/Material.hpp
index f1cd7dd..f1cd7dd 100644
--- a/source/Material.hpp
+++ b/source/30-game/Material.hpp
diff --git a/source/Mesh.cpp b/source/30-game/Mesh.cpp
index 244e2e3..244e2e3 100644
--- a/source/Mesh.cpp
+++ b/source/30-game/Mesh.cpp
diff --git a/source/Mesh.hpp b/source/30-game/Mesh.hpp
index f86fd55..f86fd55 100644
--- a/source/Mesh.hpp
+++ b/source/30-game/Mesh.hpp
diff --git a/source/Player.cpp b/source/30-game/Player.cpp
index 34c4549..34c4549 100644
--- a/source/Player.cpp
+++ b/source/30-game/Player.cpp
diff --git a/source/Player.hpp b/source/30-game/Player.hpp
index d003a25..d003a25 100644
--- a/source/Player.hpp
+++ b/source/30-game/Player.hpp
diff --git a/source/Renderer.cpp b/source/30-game/Renderer.cpp
index 3497449..3497449 100644
--- a/source/Renderer.cpp
+++ b/source/30-game/Renderer.cpp
diff --git a/source/Renderer.hpp b/source/30-game/Renderer.hpp
index 98a9f28..98a9f28 100644
--- a/source/Renderer.hpp
+++ b/source/30-game/Renderer.hpp
diff --git a/source/SceneThings.cpp b/source/30-game/SceneThings.cpp
index 3fa0436..3fa0436 100644
--- a/source/SceneThings.cpp
+++ b/source/30-game/SceneThings.cpp
diff --git a/source/SceneThings.hpp b/source/30-game/SceneThings.hpp
index c261fbb..c261fbb 100644
--- a/source/SceneThings.hpp
+++ b/source/30-game/SceneThings.hpp
diff --git a/source/Shader.cpp b/source/30-game/Shader.cpp
index 48881f0..48881f0 100644
--- a/source/Shader.cpp
+++ b/source/30-game/Shader.cpp
diff --git a/source/Shader.hpp b/source/30-game/Shader.hpp
index 707e6cc..707e6cc 100644
--- a/source/Shader.hpp
+++ b/source/30-game/Shader.hpp
diff --git a/source/Sprite.cpp b/source/30-game/Sprite.cpp
index 2b4923c..2b4923c 100644
--- a/source/Sprite.cpp
+++ b/source/30-game/Sprite.cpp
diff --git a/source/Sprite.hpp b/source/30-game/Sprite.hpp
index e163a01..e163a01 100644
--- a/source/Sprite.hpp
+++ b/source/30-game/Sprite.hpp
diff --git a/source/Texture.cpp b/source/30-game/Texture.cpp
index 6fa7c8a..6fa7c8a 100644
--- a/source/Texture.cpp
+++ b/source/30-game/Texture.cpp
diff --git a/source/Texture.hpp b/source/30-game/Texture.hpp
index 108dfa7..108dfa7 100644
--- a/source/Texture.hpp
+++ b/source/30-game/Texture.hpp
diff --git a/source/VertexIndex.cpp b/source/30-game/VertexIndex.cpp
index ac68289..ac68289 100644
--- a/source/VertexIndex.cpp
+++ b/source/30-game/VertexIndex.cpp
diff --git a/source/VertexIndex.hpp b/source/30-game/VertexIndex.hpp
index 2d65617..2d65617 100644
--- a/source/VertexIndex.hpp
+++ b/source/30-game/VertexIndex.hpp
diff --git a/source/World.cpp b/source/30-game/World.cpp
index d4a8344..d4a8344 100644
--- a/source/World.cpp
+++ b/source/30-game/World.cpp
diff --git a/source/World.hpp b/source/30-game/World.hpp
index 288142e..288142e 100644
--- a/source/World.hpp
+++ b/source/30-game/World.hpp
diff --git a/source/main.cpp b/source/30-game/main.cpp
index c49fc0b..c49fc0b 100644
--- a/source/main.cpp
+++ b/source/30-game/main.cpp