Add minimap for terrain map

	With accurate viewport shape display on minimap
	With Mapmode management
	With Region mapmode
	With Province mapmode
	With Index mapmode
	With Minimap single-click movement
	With Minimap drag-click movement

32 files changed, 1028 insertions, 269 deletions

diff --git a/extension/src/Checksum.hpp b/extension/src/Checksum.hpp
index ebdbd43..717910e 100644
--- a/extension/src/Checksum.hpp
+++ b/extension/src/Checksum.hpp
@@ -1,15 +1,13 @@
 #pragma once
 
-#include <godot_cpp/classes/object.hpp>
 #include <godot_cpp/core/class_db.hpp>
-#include <godot_cpp/variant/utility_functions.hpp>
 
 namespace OpenVic2 {
 	class Checksum : public godot::Object {
 		GDCLASS(Checksum, godot::Object)
 
 		//BEGIN BOILERPLATE
-		static Checksum* _checksum;
+		inline static Checksum* _checksum = nullptr;
 
 	protected:
 		static void _bind_methods() {
@@ -33,6 +31,4 @@ namespace OpenVic2 {
 			return godot::String("1234abcd");
 		}
 	};
-
-	Checksum* Checksum::_checksum = nullptr;
-}
\ No newline at end of file
+}
diff --git a/extension/src/LoadLocalisation.hpp b/extension/src/LoadLocalisation.hpp
index f54a025..49c0313 100644
--- a/extension/src/LoadLocalisation.hpp
+++ b/extension/src/LoadLocalisation.hpp
@@ -1,6 +1,5 @@
 #pragma once
 
-#include <godot_cpp/core/class_db.hpp>
 #include <godot_cpp/classes/translation.hpp>
 
 namespace OpenVic2 {
diff --git a/extension/src/MapMesh.cpp b/extension/src/MapMesh.cpp
index f0fc819..91c7611 100644
--- a/extension/src/MapMesh.cpp
+++ b/extension/src/MapMesh.cpp
@@ -111,7 +111,6 @@ Array MapMesh::_create_mesh_array() const {
 		uv.x = -repeat_proportion;
 
 		for (int i = 0; i <= subdivide_w + 1; ++i) {
-
 			points[point_index] = point;
 			normals[point_index] = normal;
 			tangents[point_index * 4 + 0] = 1.0f;
diff --git a/extension/src/MapSingleton.cpp b/extension/src/MapSingleton.cpp
index 0f5fe7c..73cf522 100644
--- a/extension/src/MapSingleton.cpp
+++ b/extension/src/MapSingleton.cpp
@@ -11,21 +11,50 @@ MapSingleton* MapSingleton::singleton = nullptr;
 
 void MapSingleton::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("load_province_identifier_file", "file_path"), &MapSingleton::load_province_identifier_file);
+	ClassDB::bind_method(D_METHOD("load_region_file", "file_path"), &MapSingleton::load_region_file);
 	ClassDB::bind_method(D_METHOD("load_province_shape_file", "file_path"), &MapSingleton::load_province_shape_file);
-	ClassDB::bind_method(D_METHOD("get_province_identifier_from_pixel_coords", "coords"), &MapSingleton::get_province_identifier_from_pixel_coords);
+
+	ClassDB::bind_method(D_METHOD("get_province_index_from_uv_coords", "coords"), &MapSingleton::get_province_index_from_uv_coords);
+	ClassDB::bind_method(D_METHOD("get_province_identifier_from_uv_coords", "coords"), &MapSingleton::get_province_identifier_from_uv_coords);
 	ClassDB::bind_method(D_METHOD("get_width"), &MapSingleton::get_width);
 	ClassDB::bind_method(D_METHOD("get_height"), &MapSingleton::get_height);
 	ClassDB::bind_method(D_METHOD("get_province_index_image"), &MapSingleton::get_province_index_image);
 	ClassDB::bind_method(D_METHOD("get_province_colour_image"), &MapSingleton::get_province_colour_image);
+
+	ClassDB::bind_method(D_METHOD("update_colour_image"), &MapSingleton::update_colour_image);
+	ClassDB::bind_method(D_METHOD("get_mapmode_count"), &MapSingleton::get_mapmode_count);
+	ClassDB::bind_method(D_METHOD("get_mapmode_identifier", "index"), &MapSingleton::get_mapmode_identifier);
+	ClassDB::bind_method(D_METHOD("set_mapmode", "identifier"), &MapSingleton::set_mapmode);
 }
 
 MapSingleton* MapSingleton::get_singleton() {
 	return singleton;
 }
 
+/* REQUIREMENTS:
+ * MAP-21, MAP-25
+ */
 MapSingleton::MapSingleton() {
 	ERR_FAIL_COND(singleton != nullptr);
 	singleton = this;
+
+	using mapmode_t = std::pair<std::string, Mapmode::colour_func_t>;
+	const std::vector<mapmode_t> mapmodes = {
+		{ "mapmode_province", [](Map const&, Province const& province) -> Province::colour_t { return province.get_colour(); } },
+		{ "mapmode_region", [](Map const&, Province const& province) -> Province::colour_t {
+			Region const* region = province.get_region();
+			if (region != nullptr) return region->get_provinces().front()->get_colour();
+			return province.get_colour();
+		} },
+		{ "mapmode_index", [](Map const& map, Province const& province) -> Province::colour_t {
+			const uint8_t f = float(province.get_index()) / float(map.get_province_count()) * 255.0f;
+			return (f << 16) | (f << 8) | f;
+		} }
+	};
+	std::string error_message = "";
+	for (mapmode_t mapmode : mapmodes)
+		if (map.add_mapmode(mapmode.first, mapmode.second, error_message) != SUCCESS)
+			UtilityFunctions::push_error(error_message.c_str());
 }
 
 MapSingleton::~MapSingleton() {
@@ -33,172 +62,171 @@ MapSingleton::~MapSingleton() {
 	singleton = nullptr;
 }
 
-Error MapSingleton::load_province_identifier_file(String const& file_path) {
-	UtilityFunctions::print("Loading identifier file: ", file_path);
+Error MapSingleton::parse_json_dictionary_file(String const& file_description, String const& file_path,
+	String const& identifier_prefix, parse_json_entry_func_t parse_entry) const {
+	UtilityFunctions::print("Loading ", file_description, " file: ", file_path);
 	Ref<FileAccess> file = FileAccess::open(file_path, FileAccess::ModeFlags::READ);
 	Error err = FileAccess::get_open_error();
 	if (err != OK || file.is_null()) {
-		UtilityFunctions::push_error("Failed to load province identifier file: ", file_path);
+		UtilityFunctions::push_error("Failed to load ", file_description, " file: ", file_path);
 		return err == OK ? FAILED : err;
 	}
-	String json_string = file->get_as_text();
+	const String json_string = file->get_as_text();
 	Ref<JSON> json;
 	json.instantiate();
 	err = json->parse(json_string);
-	if (err) {
-		UtilityFunctions::push_error("Failed to parse province identifier file as JSON: ", file_path,
+	if (err != OK) {
+		UtilityFunctions::push_error("Failed to parse ", file_description, " file as JSON: ", file_path,
 			"\nError at line ", json->get_error_line(), ": ", json->get_error_message());
 		return err;
 	}
-	Variant json_var = json->get_data();
-	Variant::Type type = json_var.get_type();
+	const Variant json_var = json->get_data();
+	const Variant::Type type = json_var.get_type();
 	if (type != Variant::DICTIONARY) {
-		UtilityFunctions::push_error("Invalid province identifier JSON: root has type ",
+		UtilityFunctions::push_error("Invalid ", file_description, " JSON: root has type ",
 			Variant::get_type_name(type), " (expected Dictionary)");
 		return FAILED;
 	}
-	Dictionary prov_dict = json_var;
-	Array prov_identifiers = prov_dict.keys();
-	for (int idx = 0; idx < prov_identifiers.size(); ++idx) {
-		String const& identifier = prov_identifiers[idx];
-		Variant const& colour_var = prov_dict[identifier];
+	const Dictionary dict = json_var;
+	const Array identifiers = dict.keys();
+	for (int idx = 0; idx < identifiers.size(); ++idx) {
+		String const& identifier = identifiers[idx];
+		Variant const& entry = dict[identifier];
 		if (identifier.is_empty()) {
-			UtilityFunctions::push_error("Empty province identifier with colour: ", colour_var);
+			UtilityFunctions::push_error("Empty identifier in ", file_description, " file with entry: ", entry);
 			err = FAILED;
 			continue;
 		}
-		static const String prov_prefix = "prov_";
-		if (!identifier.begins_with(prov_prefix))
-			UtilityFunctions::push_warning("Province identifier missing prefix: ", identifier);
-		type = colour_var.get_type();
-		Province::colour_t colour = Province::NULL_COLOUR;
-		if (type == Variant::ARRAY) {
-			Array colour_array = colour_var;
-			if (colour_array.size() == 3) {
-				for (int jdx = 0; jdx < 3; ++jdx) {
-					Variant var = colour_array[jdx];
-					if (var.get_type() != Variant::FLOAT) {
-						colour = Province::NULL_COLOUR;
-						break;
-					}
-					double colour_double = var;
-					if (std::trunc(colour_double) != colour_double) {
-						colour = Province::NULL_COLOUR;
-						break;
-					}
-					int64_t colour_int = static_cast<int64_t>(colour_double);
-					if (colour_int < 0 || colour_int > 255) {
-						colour = Province::NULL_COLOUR;
-						break;
-					}
-					colour = (colour << 8) | colour_int;
+		if (!identifier.begins_with(identifier_prefix))
+			UtilityFunctions::push_warning("Identifier in ", file_description, " file missing \"", identifier_prefix, "\" prefix: ", identifier);
+		if (parse_entry(identifier, entry) != OK) err = FAILED;
+	}
+	return err;
+}
+
+Error MapSingleton::_parse_province_identifier_entry(String const& identifier, Variant const& entry) {
+	const Variant::Type type = entry.get_type();
+	Province::colour_t colour = Province::NULL_COLOUR;
+	if (type == Variant::ARRAY) {
+		const Array colour_array = entry;
+		if (colour_array.size() == 3) {
+			for (int jdx = 0; jdx < 3; ++jdx) {
+				const Variant var = colour_array[jdx];
+				if (var.get_type() != Variant::FLOAT) {
+					colour = Province::NULL_COLOUR;
+					break;
 				}
-			}
-		} else if (type == Variant::STRING) {
-			String colour_string = colour_var;
-			if (colour_string.is_valid_hex_number()) {
-				int64_t colour_int = colour_string.hex_to_int();
-				if (0 <= colour_int && colour_int <= 0xFFFFFF)
-					colour = colour_int;
+				double colour_double = var;
+				if (std::trunc(colour_double) != colour_double) {
+					colour = Province::NULL_COLOUR;
+					break;
+				}
+				int64_t colour_int = static_cast<int64_t>(colour_double);
+				if (colour_int < 0 || colour_int > 255) {
+					colour = Province::NULL_COLOUR;
+					break;
+				}
+				colour = (colour << 8) | colour_int;
 			}
 		}
-		if (colour == Province::NULL_COLOUR) {
-			UtilityFunctions::push_error("Invalid province identifier colour for ", identifier, ": ", colour_var);
-			err = FAILED;
-			continue;
-		}
-		std::string error_message;
-		if (!map.add_province(identifier.utf8().get_data(), colour, error_message)) {
-			UtilityFunctions::push_error(error_message.c_str());
-			err = FAILED;
+	} else if (type == Variant::STRING) {
+		String colour_string = entry;
+		if (colour_string.is_valid_hex_number()) {
+			int64_t colour_int = colour_string.hex_to_int();
+			if (0 <= colour_int && colour_int <= 0xFFFFFF)
+				colour = colour_int;
 		}
+	} else {
+		UtilityFunctions::push_error("Invalid colour for province identifier \"", identifier, "\": ", entry);
+		return FAILED;
 	}
+	std::string error_message = "";
+	if (map.add_province(identifier.utf8().get_data(), colour, error_message) != SUCCESS) {
+		UtilityFunctions::push_error(error_message.c_str());
+		return FAILED;
+	}
+	return OK;
+}
+
+Error MapSingleton::load_province_identifier_file(String const& file_path) {
+	const Error err = parse_json_dictionary_file("province identifier", file_path, "prov_",
+		[this](String const& identifier, Variant const& entry) -> Error {
+			return this->_parse_province_identifier_entry(identifier, entry);
+		});
 	map.lock_provinces();
 	return err;
 }
 
-static Province::colour_t colour_at(PackedByteArray const& colour_data_array, int32_t idx) {
-	return (colour_data_array[idx * 3] << 16) | (colour_data_array[idx * 3 + 1] << 8) | colour_data_array[idx * 3 + 2];
+Error MapSingleton::_parse_region_entry(String const& identifier, Variant const& entry) {
+	Error err = OK;
+	Variant::Type type = entry.get_type();
+	std::vector<std::string> province_identifiers;
+	if (type == Variant::ARRAY) {
+		const Array province_array = entry;
+		for (int64_t idx = 0; idx < province_array.size(); ++idx) {
+			const Variant province_var = province_array[idx];
+			type = province_var.get_type();
+			if (type == Variant::STRING) {
+				String province_string = province_var;
+				province_identifiers.push_back(province_string.utf8().get_data());
+			} else {
+				UtilityFunctions::push_error("Invalid province identifier for region \"", identifier, "\": ", entry);
+				err = FAILED;
+			}
+		}
+	}
+	std::string error_message = "";
+	if (map.add_region(identifier.utf8().get_data(), province_identifiers, error_message) != SUCCESS) {
+		UtilityFunctions::push_error(error_message.c_str());
+		return FAILED;
+	}
+	return err;
+}
+
+Error MapSingleton::load_region_file(String const& file_path) {
+	const Error err = parse_json_dictionary_file("region", file_path, "region_",
+		[this](String const& identifier, Variant const& entry) -> Error {
+			return this->_parse_region_entry(identifier, entry);
+		});
+	map.lock_regions();
+	return err;
 }
 
 Error MapSingleton::load_province_shape_file(String const& file_path) {
-	if (province_shape_image.is_valid()) {
+	if (province_index_image.is_valid()) {
 		UtilityFunctions::push_error("Province shape file has already been loaded, cannot load: ", file_path);
 		return FAILED;
 	}
+	Ref<Image> province_shape_image;
 	province_shape_image.instantiate();
 	Error err = province_shape_image->load(file_path);
 	if (err != OK) {
 		UtilityFunctions::push_error("Failed to load province shape file: ", file_path);
-		province_shape_image.unref();
 		return err;
 	}
-	width = province_shape_image->get_width();
-	height = province_shape_image->get_height();
+	int32_t width = province_shape_image->get_width();
+	int32_t height = province_shape_image->get_height();
 	if (width < 1 || height < 1) {
 		UtilityFunctions::push_error("Invalid dimensions (", width, "x", height, ") for province shape file: ", file_path);
 		err = FAILED;
 	}
 	static const Image::Format expected_format = Image::FORMAT_RGB8;
-	Image::Format format = province_shape_image->get_format();
+	const Image::Format format = province_shape_image->get_format();
 	if (format != expected_format) {
 		UtilityFunctions::push_error("Invalid format (", format, ", should be ", expected_format, ") for province shape file: ", file_path);
 		err = FAILED;
 	}
-	if (err) {
-		province_shape_image.unref();
-		return err;
-	}
+	if (err != OK) return err;
 
-	std::vector<bool> province_checklist(map.get_province_count());
-
-	PackedByteArray shape_data_array = province_shape_image->get_data(), index_data_array;
-	index_data_array.resize(width * height * sizeof(Province::index_t));
-	Province::index_t* index_data = reinterpret_cast<Province::index_t*>(index_data_array.ptrw());
-
-	for (int32_t y = 0; y < height; ++y) {
-		for (int32_t x = 0; x < width; ++x) {
-			const int32_t idx = x + y * width;
-			const Province::colour_t colour = colour_at(shape_data_array, idx);
-			if (colour == Province::NULL_COLOUR) {
-				index_data[idx] = Province::NULL_INDEX;
-				continue;
-			}
-			if (x > 0) {
-				const int32_t jdx = idx - 1;
-				if (colour_at(shape_data_array, jdx) == colour) {
-					index_data[idx] = index_data[jdx];
-					continue;
-				}
-			}
-			if (y > 0) {
-				const int32_t jdx = idx - width;
-				if (colour_at(shape_data_array, jdx) == colour) {
-					index_data[idx] = index_data[jdx];
-					continue;
-				}
-			}
-			const Province* province = map.get_province_by_colour(colour);
-			if (province) {
-				Province::index_t index = province->get_index();
-				index_data[idx] = index;
-				province_checklist[index - 1] = true;
-				continue;
-			}
-			UtilityFunctions::push_error("Unrecognised province colour ", Province::colour_to_hex_string(colour).c_str(), " at (", x, ", ", y, ")");
-			err = FAILED;
-			index_data[idx] = Province::NULL_INDEX;
-		}
+	std::string error_message = "";
+	if (map.generate_province_index_image(width, height, province_shape_image->get_data().ptr(), error_message) != SUCCESS) {
+		UtilityFunctions::push_error(error_message.c_str());
+		err = FAILED;
 	}
 
-	for (size_t idx = 0; idx < province_checklist.size(); ++idx) {
-		if (!province_checklist[idx]) {
-			Province* province = map.get_province_by_index(idx + 1);
-			if (province) UtilityFunctions::push_error("Province missing from shape image: ", province->to_string().c_str());
-			else UtilityFunctions::push_error("Province missing for index: ", static_cast<int32_t>(idx + 1));
-			err = FAILED;
-		}
-	}
+	PackedByteArray index_data_array;
+	index_data_array.resize(width * height * sizeof(Province::index_t));
+	memcpy(index_data_array.ptrw(), map.get_province_index_image().data(), index_data_array.size());
 
 	province_index_image = Image::create_from_data(width, height, false, Image::FORMAT_RG8, index_data_array);
 	if (province_index_image.is_null()) {
@@ -206,45 +234,51 @@ Error MapSingleton::load_province_shape_file(String const& file_path) {
 		err = FAILED;
 	}
 
-	PackedByteArray colour_data_array;
-	colour_data_array.resize((Province::MAX_INDEX + 1) * 3);
-	for (size_t idx = 1; idx <= map.get_province_count(); ++idx) {
-		const Province* province = map.get_province_by_index(idx);
-		if (province) {
-			const Province::colour_t colour = province->get_colour();
-			colour_data_array[3 * idx + 0] = (colour >> 16) & 0xFF;
-			colour_data_array[3 * idx + 1] = (colour >> 8) & 0xFF;
-			colour_data_array[3 * idx + 2] = colour & 0xFF;
-		} else UtilityFunctions::push_error("Missing province at index ", static_cast<int32_t>(idx));
-	}
-	static const int32_t PROVINCE_INDEX_SQRT = 1 << (sizeof(Province::index_t) * 4);
-	province_colour_image = Image::create_from_data(PROVINCE_INDEX_SQRT, PROVINCE_INDEX_SQRT, false, Image::FORMAT_RGB8, colour_data_array);
-	if (province_colour_image.is_null()) {
-		UtilityFunctions::push_error("Failed to create province colour image");
-		err = FAILED;
-	}
+	if (update_colour_image() != OK) err = FAILED;
 
 	return err;
 }
 
-String MapSingleton::get_province_identifier_from_pixel_coords(Vector2i const& coords) {
+Province* MapSingleton::get_province_from_uv_coords(godot::Vector2 const& coords) {
+	if (province_index_image.is_valid()) {
+		const PackedByteArray index_data_array = province_index_image->get_data();
+		Province::index_t const* index_data = reinterpret_cast<Province::index_t const*>(index_data_array.ptr());
+		const int32_t x_mod_w = UtilityFunctions::fposmod(coords.x, 1.0f) * get_width();
+		const int32_t y_mod_h = UtilityFunctions::fposmod(coords.y, 1.0f) * get_height();
+		return map.get_province_by_index(index_data[x_mod_w + y_mod_h * get_width()]);
+	}
+	return nullptr;
+}
+
+Province const* MapSingleton::get_province_from_uv_coords(godot::Vector2 const& coords) const {
 	if (province_index_image.is_valid()) {
 		const PackedByteArray index_data_array = province_index_image->get_data();
-		const Province::index_t* index_data = reinterpret_cast<const Province::index_t*>(index_data_array.ptr());
-		const int32_t x_mod_w = UtilityFunctions::posmod(coords.x, width);
-		const int32_t y_mod_h = UtilityFunctions::posmod(coords.y, height);
-		const Province* province = map.get_province_by_index(index_data[x_mod_w + y_mod_h * width]);
-		if (province) return province->get_identifier().c_str();
+		Province::index_t const* index_data = reinterpret_cast<Province::index_t const*>(index_data_array.ptr());
+		const int32_t x_mod_w = UtilityFunctions::fposmod(coords.x, 1.0f) * get_width();
+		const int32_t y_mod_h = UtilityFunctions::fposmod(coords.y, 1.0f) * get_height();
+		return map.get_province_by_index(index_data[x_mod_w + y_mod_h * get_width()]);
 	}
+	return nullptr;
+}
+
+int32_t MapSingleton::get_province_index_from_uv_coords(Vector2 const& coords) const {
+	Province const* province = get_province_from_uv_coords(coords);
+	if (province != nullptr) return province->get_index();
+	return Province::NULL_INDEX;
+}
+
+String MapSingleton::get_province_identifier_from_uv_coords(Vector2 const& coords) const {
+	Province const* province = get_province_from_uv_coords(coords);
+	if (province != nullptr) return province->get_identifier().c_str();
 	return String{};
 }
 
 int32_t MapSingleton::get_width() const {
-	return width;
+	return map.get_width();
 }
 
 int32_t MapSingleton::get_height() const {
-	return height;
+	return map.get_height();
 }
 
 Ref<Image> MapSingleton::get_province_index_image() const {
@@ -254,3 +288,48 @@ Ref<Image> MapSingleton::get_province_index_image() const {
 Ref<Image> MapSingleton::get_province_colour_image() const {
 	return province_colour_image;
 }
+
+Error MapSingleton::update_colour_image() {
+	static PackedByteArray colour_data_array;
+	static const int64_t colour_data_array_size = (Province::MAX_INDEX + 1) * 3;
+	colour_data_array.resize(colour_data_array_size);
+
+	Error err = OK;
+	std::string error_message = "";
+	if (map.generate_mapmode_colours(mapmode_index, colour_data_array.ptrw(), error_message) != SUCCESS) {
+		UtilityFunctions::push_error(error_message.c_str());
+		err = FAILED;
+	}
+
+	static const int32_t PROVINCE_INDEX_SQRT = 1 << (sizeof(Province::index_t) * 4);
+	if (province_colour_image.is_null())
+		province_colour_image.instantiate();
+	province_colour_image->set_data(PROVINCE_INDEX_SQRT, PROVINCE_INDEX_SQRT,
+		false, Image::FORMAT_RGB8, colour_data_array);
+	if (province_colour_image.is_null()) {
+		UtilityFunctions::push_error("Failed to update province colour image");
+		return FAILED;
+	}
+	return err;
+}
+
+int32_t MapSingleton::get_mapmode_count() const {
+	return map.get_mapmode_count();
+}
+
+String MapSingleton::get_mapmode_identifier(int32_t index) const {
+	Mapmode const* mapmode = map.get_mapmode_by_index(index);
+	if (mapmode != nullptr) return mapmode->get_identifier().c_str();
+	return String{};
+}
+
+Error MapSingleton::set_mapmode(godot::String const& identifier) {
+	Mapmode const* mapmode = map.get_mapmode_by_identifier(identifier.utf8().get_data());
+	if (mapmode != nullptr) {
+		mapmode_index = mapmode->get_index();
+		return OK;
+	} else {
+		UtilityFunctions::push_error("Failed to set mapmode to: ", identifier);
+		return FAILED;
+	}
+}
diff --git a/extension/src/MapSingleton.hpp b/extension/src/MapSingleton.hpp
index 71761cd..9205e92 100644
--- a/extension/src/MapSingleton.hpp
+++ b/extension/src/MapSingleton.hpp
@@ -1,19 +1,27 @@
 #pragma once
 
+#include <functional>
+
 #include <godot_cpp/classes/image.hpp>
+
 #include "openvic2/Map.hpp"
 
 namespace OpenVic2 {
 	class MapSingleton : public godot::Object {
+		using parse_json_entry_func_t = std::function<godot::Error (godot::String const&, godot::Variant const&)>;
 
 		GDCLASS(MapSingleton, godot::Object)
 
 		static MapSingleton* singleton;
 
-		godot::Ref<godot::Image> province_shape_image, province_index_image, province_colour_image;
-		int32_t width = 0, height = 0;
+		godot::Ref<godot::Image> province_index_image, province_colour_image;
 		Map map;
+		Mapmode::index_t mapmode_index = 0;
 
+		godot::Error parse_json_dictionary_file(godot::String const& file_description, godot::String const& file_path,
+			godot::String const& identifier_prefix, parse_json_entry_func_t parse_entry) const;
+		godot::Error _parse_province_identifier_entry(godot::String const& identifier, godot::Variant const& entry);
+		godot::Error _parse_region_entry(godot::String const& identifier, godot::Variant const& entry);
 	protected:
 		static void _bind_methods();
 
@@ -24,11 +32,21 @@ namespace OpenVic2 {
 		~MapSingleton();
 
 		godot::Error load_province_identifier_file(godot::String const& file_path);
+		godot::Error load_region_file(godot::String const& file_path);
 		godot::Error load_province_shape_file(godot::String const& file_path);
-		godot::String get_province_identifier_from_pixel_coords(godot::Vector2i const& coords);
+
+		Province* get_province_from_uv_coords(godot::Vector2 const& coords);
+		Province const* get_province_from_uv_coords(godot::Vector2 const& coords) const;
+		int32_t get_province_index_from_uv_coords(godot::Vector2 const& coords) const;
+		godot::String get_province_identifier_from_uv_coords(godot::Vector2 const& coords) const;
 		int32_t get_width() const;
 		int32_t get_height() const;
 		godot::Ref<godot::Image> get_province_index_image() const;
 		godot::Ref<godot::Image> get_province_colour_image() const;
+
+		godot::Error update_colour_image();
+		int32_t get_mapmode_count() const;
+		godot::String get_mapmode_identifier(int32_t index) const;
+		godot::Error set_mapmode(godot::String const& identifier);
 	};
 }
diff --git a/extension/src/Simulation.hpp b/extension/src/Simulation.hpp
index 8959310..b84016b 100644
--- a/extension/src/Simulation.hpp
+++ b/extension/src/Simulation.hpp
@@ -1,8 +1,6 @@
 #pragma once
 
-#include <godot_cpp/classes/object.hpp>
 #include <godot_cpp/core/class_db.hpp>
-#include <godot_cpp/variant/utility_functions.hpp>
 #include <vector>
 
 namespace OpenVic2 {
@@ -11,7 +9,7 @@ namespace OpenVic2 {
 		std::vector<uint64_t> exampleProvinces;
 
 		//BEGIN BOILERPLATE
-		static Simulation* _simulation;
+		inline static Simulation* _simulation = nullptr;
 
 		protected:
 		static void _bind_methods() {
@@ -47,6 +45,4 @@ namespace OpenVic2 {
 			return exampleProvinces[provinceID];
 		}
 	};
-
-	Simulation* Simulation::_simulation = nullptr;
 }
diff --git a/extension/src/TestSingleton.hpp b/extension/src/TestSingleton.hpp
index d140516..1261573 100644
--- a/extension/src/TestSingleton.hpp
+++ b/extension/src/TestSingleton.hpp
@@ -1,7 +1,6 @@
 #pragma once
 
 #include <godot_cpp/classes/object.hpp>
-#include <godot_cpp/core/class_db.hpp>
 
 namespace OpenVic2 {
 	class TestSingleton : public godot::Object
diff --git a/extension/src/openvic2/Map.cpp b/extension/src/openvic2/Map.cpp
index d980b88..1654189 100644
--- a/extension/src/openvic2/Map.cpp
+++ b/extension/src/openvic2/Map.cpp
@@ -1,73 +1,126 @@
 #include "Map.hpp"
 
 #include <cassert>
-#include <sstream>
-#include <iomanip>
 
 using namespace OpenVic2;
 
-Province::Province(index_t new_index, std::string const& new_identifier, colour_t new_colour) :
-	index(new_index), identifier(new_identifier), colour(new_colour) {
-	assert(index != NULL_INDEX);
-	assert(!identifier.empty());
-	assert(colour != NULL_COLOUR);
-}
+static const std::string SEPARATOR = "\n - ";
 
-std::string Province::colour_to_hex_string(colour_t colour) {
-	std::ostringstream stream;
-	stream << std::hex << std::setfill('0') << std::setw(6) << colour;
-	return stream.str();
+Mapmode::Mapmode(index_t new_index, std::string const& new_identifier, colour_func_t new_colour_func)
+	: index(new_index), identifier(new_identifier), colour_func(new_colour_func) {
+	assert(!identifier.empty());
+	assert(colour_func != nullptr);
 }
 
-Province::index_t Province::get_index() const {
+Mapmode::index_t Mapmode::get_index() const {
 	return index;
 }
 
-std::string const& Province::get_identifier() const {
+std::string const& Mapmode::get_identifier() const {
 	return identifier;
 }
 
-Province::colour_t Province::get_colour() const {
-	return colour;
-}
-
-std::string Province::to_string() const {
-	return "(#" + std::to_string(index) + ", " + identifier + ", 0x" + colour_to_hex_string(colour) + ")";
+Mapmode::colour_func_t Mapmode::get_colour_func() const {
+	return colour_func;
 }
 
-bool Map::add_province(std::string const& identifier, Province::colour_t colour, std::string& error_message) {
+return_t Map::add_province(std::string const& identifier, Province::colour_t colour, std::string& error_message) {
 	if (provinces_locked) {
 		error_message = "The map's province list has already been locked!";
-		return false;
+		return FAILURE;
 	}
 	if (provinces.size() >= Province::MAX_INDEX) {
 		error_message = "The map's province list is full - there can be at most " + std::to_string(Province::MAX_INDEX) + " provinces";
-		return false;
+		return FAILURE;
+	}
+	if (identifier.empty()) {
+		error_message = "Empty province identifier for colour " + Province::colour_to_hex_string(colour);
+		return FAILURE;
 	}
 	if (colour == Province::NULL_COLOUR || colour > Province::MAX_COLOUR) {
 		error_message = "Invalid province colour: " + Province::colour_to_hex_string(colour);
-		return false;
+		return FAILURE;
 	}
 	Province new_province{ static_cast<Province::index_t>(provinces.size() + 1), identifier, colour };
 	for (Province const& province : provinces) {
-		if (province.identifier == identifier) {
+		if (province.get_identifier() == identifier) {
 			error_message = "Duplicate province identifiers: " + province.to_string() + " and " + new_province.to_string();
-			return false;
+			return FAILURE;
 		}
-		if (province.colour == colour) {
+		if (province.get_colour() == colour) {
 			error_message = "Duplicate province colours: " + province.to_string() + " and " + new_province.to_string();
-			return false;
+			return FAILURE;
 		}
 	}
 	provinces.push_back(new_province);
 	error_message = "Added province: " + new_province.to_string();
-	return true;
+	return SUCCESS;
 }
 
 void Map::lock_provinces() {
 	provinces_locked = true;
 }
 
+return_t Map::add_region(std::string const& identifier, std::vector<std::string> const& province_identifiers, std::string& error_message) {
+	if (regions_locked) {
+		error_message = "The map's region list has already been locked!";
+		return FAILURE;
+	}
+	if (identifier.empty()) {
+		error_message = "Empty region identifier!";
+		return FAILURE;
+	}
+	if (provinces.empty()) {
+		error_message = "Empty province list for region " + identifier;
+		return FAILURE;
+	}
+	Region new_region{ identifier };
+	error_message = "Error message for region: " + identifier;
+	for (std::string const& province_identifier : province_identifiers) {
+		Province* province = get_province_by_identifier(province_identifier);
+		if (province != nullptr) {
+			if (new_region.contains_province(province))
+				error_message += SEPARATOR + "Duplicate province identifier " + province_identifier;
+			else {
+				size_t other_region_index = reinterpret_cast<size_t>(province->get_region());
+				if (other_region_index != 0) {
+					other_region_index--;
+					error_message += SEPARATOR + "Province " + province_identifier + " is already part of ";
+					if (other_region_index < regions.size())
+						error_message += regions[other_region_index].get_identifier();
+					else
+						error_message += "an unknown region with index " + std::to_string(other_region_index);
+				} else new_region.provinces.push_back(province);
+			}
+		} else error_message += SEPARATOR + "Invalid province identifier " + province_identifier;
+	}
+	if (!new_region.get_province_count()) {
+		error_message += SEPARATOR + "No valid provinces in region's list";
+		return FAILURE;
+	}
+	for (Region const& region : regions) {
+		if (region.get_identifier() == identifier) {
+			error_message += SEPARATOR + "Duplicate region identifiers: " + region.get_identifier() + " and " + identifier;
+			return FAILURE;
+		}
+	}
+	regions.push_back(new_region);
+	error_message += SEPARATOR + "Added region: " + identifier;
+	// Used to detect provinces listed in multiple regions, will
+	// be corrected once regions is stable (i.e. lock_regions).
+	Region* tmp_region_index = reinterpret_cast<Region*>(regions.size());
+	for (Province* province : new_region.get_provinces())
+		province->region = tmp_region_index;
+	return SUCCESS;
+}
+
+void Map::lock_regions() {
+	regions_locked = true;
+	for (Region& region : regions)
+		for (Province* province : region.get_provinces())
+			province->region = &region;
+}
+
 size_t Map::get_province_count() const {
 	return provinces.size();
 }
@@ -76,14 +129,178 @@ Province* Map::get_province_by_index(Province::index_t index) {
 	return index != Province::NULL_INDEX && index <= provinces.size() ? &provinces[index - 1] : nullptr;
 }
 
+Province const* Map::get_province_by_index(Province::index_t index) const {
+	return index != Province::NULL_INDEX && index <= provinces.size() ? &provinces[index - 1] : nullptr;
+}
+
 Province* Map::get_province_by_identifier(std::string const& identifier) {
-	for (Province& province : provinces)
-		if (province.identifier == identifier) return &province;
+	if (!identifier.empty())
+		for (Province& province : provinces)
+			if (province.get_identifier() == identifier) return &province;
+	return nullptr;
+}
+
+Province const* Map::get_province_by_identifier(std::string const& identifier) const {
+	if (!identifier.empty())
+		for (Province const& province : provinces)
+			if (province.get_identifier() == identifier) return &province;
 	return nullptr;
 }
 
 Province* Map::get_province_by_colour(Province::colour_t colour) {
-	for (Province& province : provinces)
-		if (province.colour == colour) return &province;
+	if (colour != Province::NULL_COLOUR)
+		for (Province& province : provinces)
+			if (province.get_colour() == colour) return &province;
+	return nullptr;
+}
+
+Province const* Map::get_province_by_colour(Province::colour_t colour) const {
+	if (colour != Province::NULL_COLOUR)
+		for (Province const& province : provinces)
+			if (province.get_colour() == colour) return &province;
+	return nullptr;
+}
+
+static Province::colour_t colour_at(uint8_t const* colour_data, int32_t idx) {
+	return (colour_data[idx * 3] << 16) | (colour_data[idx * 3 + 1] << 8) | colour_data[idx * 3 + 2];
+}
+
+return_t Map::generate_province_index_image(size_t new_width, size_t new_height, uint8_t const* colour_data, std::string& error_message) {
+	if (!province_index_image.empty()) {
+		error_message = "Province index image has already been generated!";
+		return FAILURE;
+	}
+	if (!provinces_locked) {
+		error_message = "Province index image cannot be generated until after provinces are locked!";
+		return FAILURE;
+	}
+	if (new_width < 1 || new_height < 1) {
+		error_message = "Invalid province image dimensions: " + std::to_string(new_width) + "x" + std::to_string(new_height);
+		return FAILURE;
+	}
+	if (colour_data == nullptr) {
+		error_message = "Province colour data pointer is null!";
+		return FAILURE;
+	}
+	width = new_width;
+	height = new_height;
+	province_index_image.resize(width * height);
+
+	std::vector<bool> province_checklist(provinces.size());
+	return_t ret = SUCCESS;
+
+	error_message = "Error message for province index image generation:";
+
+	for (int32_t y = 0; y < height; ++y) {
+		for (int32_t x = 0; x < width; ++x) {
+			const int32_t idx = x + y * width;
+			const Province::colour_t colour = colour_at(colour_data, idx);
+			if (colour == Province::NULL_COLOUR) {
+				province_index_image[idx] = Province::NULL_INDEX;
+				continue;
+			}
+			if (x > 0) {
+				const int32_t jdx = idx - 1;
+				if (colour_at(colour_data, jdx) == colour) {
+					province_index_image[idx] = province_index_image[jdx];
+					continue;
+				}
+			}
+			if (y > 0) {
+				const int32_t jdx = idx - width;
+				if (colour_at(colour_data, jdx) == colour) {
+					province_index_image[idx] = province_index_image[jdx];
+					continue;
+				}
+			}
+			Province const* province = get_province_by_colour(colour);
+			if (province != nullptr) {
+				const Province::index_t index = province->get_index();
+				province_index_image[idx] = index;
+				province_checklist[index - 1] = true;
+				continue;
+			}
+			error_message += SEPARATOR + "Unrecognised province colour " + Province::colour_to_hex_string(colour) + " at (" + std::to_string(x) + ", " + std::to_string(x) + ")";
+			ret = FAILURE;
+			province_index_image[idx] = Province::NULL_INDEX;
+		}
+	}
+
+	for (size_t idx = 0; idx < province_checklist.size(); ++idx) {
+		if (!province_checklist[idx]) {
+			error_message += SEPARATOR + "Province missing from shape image: " + provinces[idx].to_string();
+			ret = FAILURE;
+		}
+	}
+
+	error_message += SEPARATOR + "Generated province index image";
+	return ret;
+}
+
+size_t Map::get_width() const {
+	return width;
+}
+
+size_t Map::get_height() const {
+	return height;
+}
+
+std::vector<Province::index_t> const& Map::get_province_index_image() const {
+	return province_index_image;
+}
+
+return_t Map::add_mapmode(std::string const& identifier, Mapmode::colour_func_t colour_func, std::string& error_message) {
+	if (identifier.empty()) {
+		error_message = "Empty mapmode identifier!";
+		return FAILURE;
+	}
+	if (colour_func == nullptr) {
+		error_message = "Mapmode colour function is null for identifier: " + identifier;
+		return FAILURE;
+	}
+	Mapmode new_mapmode{ mapmodes.size(), identifier, colour_func };
+	for (Mapmode const& mapmode : mapmodes) {
+		if (mapmode.get_identifier() == identifier) {
+			error_message = "Duplicate mapmode identifiers: " + mapmode.get_identifier() + " and " + identifier;
+			return FAILURE;
+		}
+	}
+	mapmodes.push_back(new_mapmode);
+	error_message = "Added mapmode: " + identifier;
+	return SUCCESS;
+}
+
+size_t Map::get_mapmode_count() const {
+	return mapmodes.size();
+}
+
+Mapmode const* Map::get_mapmode_by_index(size_t index) const {
+	return index < mapmodes.size() ? &mapmodes[index] : nullptr;
+}
+
+Mapmode const* Map::get_mapmode_by_identifier(std::string const& identifier) const {
+	if (!identifier.empty())
+		for (Mapmode const& mapmode : mapmodes)
+			if (mapmode.get_identifier() == identifier) return &mapmode;
 	return nullptr;
 }
+
+return_t Map::generate_mapmode_colours(Mapmode::index_t index, uint8_t* target, std::string& error_message) const {
+	if (target == nullptr) {
+		error_message = "Mapmode colour target pointer is null!";
+		return FAILURE;
+	}
+	if (index >= mapmodes.size()) {
+		error_message = "Invalid mapmode index: " + std::to_string(index);
+		return FAILURE;
+	}
+	Mapmode const& mapmode = mapmodes[index];
+	target += 3; // Skip past Province::NULL_INDEX
+	for (Province const& province : provinces) {
+		const Province::colour_t colour = mapmode.get_colour_func()(*this, province);
+		*target++ = (colour >> 16) & 0xFF;
+		*target++ = (colour >> 8) & 0xFF;
+		*target++ = colour & 0xFF;
+	}
+	return SUCCESS;
+}
diff --git a/extension/src/openvic2/Map.hpp b/extension/src/openvic2/Map.hpp
index 365d78b..42963c9 100644
--- a/extension/src/openvic2/Map.hpp
+++ b/extension/src/openvic2/Map.hpp
@@ -3,43 +3,111 @@
 #include <string>
 #include <cstdint>
 #include <vector>
+#include <functional>
+
+#include "Types.hpp"
 
 namespace OpenVic2 {
+	struct Region;
+	struct Map;
 
+	/* REQUIREMENTS:
+	 * MAP-43, MAP-47
+	 */
 	struct Province {
+		friend struct Map;
+
 		using colour_t = uint32_t;
 		using index_t = uint16_t;
-		friend struct Map;
+
 		static const colour_t NULL_COLOUR = 0, MAX_COLOUR = 0xFFFFFF;
 		static const index_t NULL_INDEX = 0, MAX_INDEX = 0xFFFF;
 	private:
 		index_t index;
 		std::string identifier;
 		colour_t colour;
+		Region* region = nullptr;
 
-		Province(index_t index, std::string const& identifier, colour_t colour);
+		Province(index_t new_index, std::string const& new_identifier, colour_t new_colour);
 	public:
 		static std::string colour_to_hex_string(colour_t colour);
 
 		index_t get_index() const;
 		std::string const& get_identifier() const;
 		colour_t get_colour() const;
+		Region* get_region() const;
 		std::string to_string() const;
 	};
 
+	/* REQUIREMENTS:
+	 * MAP-6, MAP-44, MAP-48
+	 */
+	struct Region {
+		friend struct Map;
+	private:
+		std::string identifier;
+		std::vector<Province*> provinces;
+
+		Region(std::string const& new_identifier);
+	public:
+		std::string const& get_identifier() const;
+		size_t get_province_count() const;
+		bool contains_province(Province const* province) const;
+		std::vector<Province*> const& get_provinces() const;
+	};
+
+	struct Mapmode {
+		friend struct Map;
+
+		using colour_func_t = std::function<Province::colour_t (Map const&, Province const&)>;
+		using index_t = size_t;
+	private:
+		index_t index;
+		std::string identifier;
+		colour_func_t colour_func;
+
+		Mapmode(index_t new_index, std::string const& new_identifier, colour_func_t new_colour_func);
+	public:
+		index_t get_index() const;
+		std::string const& get_identifier() const;
+		colour_func_t get_colour_func() const;
+	};
+
+	/* REQUIREMENTS:
+	 * MAP-4
+	 */
 	struct Map {
 	private:
 		std::vector<Province> provinces;
-		bool provinces_locked = false;
+		std::vector<Region> regions;
+		bool provinces_locked = false, regions_locked = false;
 
+		size_t width = 0, height = 0;
+		std::vector<Province::index_t> province_index_image;
+		std::vector<Mapmode> mapmodes;
 	public:
-		bool add_province(std::string const& identifier, Province::colour_t colour, std::string& error_message);
+		return_t add_province(std::string const& identifier, Province::colour_t colour, std::string& error_message);
 		void lock_provinces();
+		return_t add_region(std::string const& identifier, std::vector<std::string> const& province_identifiers, std::string& error_message);
+		void lock_regions();
 		size_t get_province_count() const;
 
 		Province* get_province_by_index(Province::index_t index);
+		Province const* get_province_by_index(Province::index_t index) const;
 		Province* get_province_by_identifier(std::string const& identifier);
+		Province const* get_province_by_identifier(std::string const& identifier) const;
 		Province* get_province_by_colour(Province::colour_t colour);
-	};
+		Province const* get_province_by_colour(Province::colour_t colour) const;
+
+		return_t generate_province_index_image(size_t new_width, size_t new_height, uint8_t const* colour_data, std::string& error_message);
+		size_t get_width() const;
+		size_t get_height() const;
+		std::vector<Province::index_t> const& get_province_index_image() const;
 
+		return_t add_mapmode(std::string const& identifier, Mapmode::colour_func_t colour_func, std::string& error_message);
+		size_t get_mapmode_count() const;
+		Mapmode const* get_mapmode_by_index(Mapmode::index_t index) const;
+		Mapmode const* get_mapmode_by_identifier(std::string const& identifier) const;
+		return_t generate_mapmode_colours(Mapmode::index_t index, uint8_t* target, std::string& error_message) const;
+	};
 }
diff --git a/extension/src/openvic2/Province.cpp b/extension/src/openvic2/Province.cpp
new file mode 100644
index 0000000..49f1b0e
--- /dev/null
+++ b/extension/src/openvic2/Province.cpp
@@ -0,0 +1,40 @@
+#include "Map.hpp"
+
+#include <cassert>
+#include <sstream>
+#include <iomanip>
+
+using namespace OpenVic2;
+
+Province::Province(index_t new_index, std::string const& new_identifier, colour_t new_colour) :
+	index(new_index), identifier(new_identifier), colour(new_colour) {
+	assert(index != NULL_INDEX);
+	assert(!identifier.empty());
+	assert(colour != NULL_COLOUR);
+}
+
+std::string Province::colour_to_hex_string(colour_t colour) {
+	std::ostringstream stream;
+	stream << std::hex << std::setfill('0') << std::setw(6) << colour;
+	return stream.str();
+}
+
+Province::index_t Province::get_index() const {
+	return index;
+}
+
+std::string const& Province::get_identifier() const {
+	return identifier;
+}
+
+Province::colour_t Province::get_colour() const {
+	return colour;
+}
+
+Region* Province::get_region() const {
+	return region;
+}
+
+std::string Province::to_string() const {
+	return "(#" + std::to_string(index) + ", " + identifier + ", 0x" + colour_to_hex_string(colour) + ")";
+}
diff --git a/extension/src/openvic2/Region.cpp b/extension/src/openvic2/Region.cpp
new file mode 100644
index 0000000..6ee05f5
--- /dev/null
+++ b/extension/src/openvic2/Region.cpp
@@ -0,0 +1,26 @@
+#include "Map.hpp"
+
+#include <cassert>
+#include <algorithm>
+
+using namespace OpenVic2;
+
+Region::Region(std::string const& new_identifier) : identifier(new_identifier) {
+	assert(!identifier.empty());
+}
+
+std::string const& Region::get_identifier() const {
+	return identifier;
+}
+
+size_t Region::get_province_count() const {
+	return provinces.size();
+}
+
+bool Region::contains_province(Province const* province) const {
+	return province && std::find(provinces.begin(), provinces.end(), province) != provinces.end();
+}
+
+std::vector<Province*> const& Region::get_provinces() const {
+	return provinces;
+}
diff --git a/extension/src/openvic2/Types.hpp b/extension/src/openvic2/Types.hpp
new file mode 100644
index 0000000..0fb1c8b
--- /dev/null
+++ b/extension/src/openvic2/Types.hpp
@@ -0,0 +1,7 @@
+#pragma once
+
+namespace OpenVic2 {
+	using return_t = bool;
+	// This mirrors godot::Error, where `OK = 0` and `FAILED = 1`.
+	static const return_t SUCCESS = false, FAILURE = true;
+}
diff --git a/extension/src/register_types.cpp b/extension/src/register_types.cpp
index 16e59b2..9fd934e 100644
--- a/extension/src/register_types.cpp
+++ b/extension/src/register_types.cpp
@@ -1,8 +1,5 @@
 #include "register_types.h"
-#include <gdextension_interface.h>
-#include <godot_cpp/core/class_db.hpp>
-#include <godot_cpp/core/defs.hpp>
-#include <godot_cpp/godot.hpp>
+
 #include <godot_cpp/classes/engine.hpp>
 
 #include "TestSingleton.hpp"
@@ -74,7 +71,7 @@ extern "C" {
 
 	// Initialization.
 
-	GDExtensionBool GDE_EXPORT openvic2_library_init(const GDExtensionInterface* p_interface, const GDExtensionClassLibraryPtr p_library, GDExtensionInitialization* r_initialization) {
+	GDExtensionBool GDE_EXPORT openvic2_library_init(GDExtensionInterface const* p_interface, const GDExtensionClassLibraryPtr p_library, GDExtensionInitialization* r_initialization) {
 		GDExtensionBinding::InitObject init_obj(p_interface, p_library, r_initialization);
 
 		init_obj.register_initializer(initialize_openvic2_types);
diff --git a/extension/src/register_types.h b/extension/src/register_types.h
index 860359f..1bc96f8 100644
--- a/extension/src/register_types.h
+++ b/extension/src/register_types.h
@@ -1,6 +1,6 @@
 #pragma once
 
-#include <godot_cpp/core/class_db.hpp>
+#include <godot_cpp/godot.hpp>
 
 void initialize_openvic2_types(godot::ModuleInitializationLevel);
 void uninitialize_openvic2_types(godot::ModuleInitializationLevel);
\ No newline at end of file
diff --git a/game/common/map/terrain/terrain.png b/game/art/terrain/terrain.png
index 6d36dee..6d36dee 100644
--- a/game/common/map/terrain/terrain.png
+++ b/game/art/terrain/terrain.png
diff --git a/game/common/map/terrain/terrain.png.import b/game/art/terrain/terrain.png.import
index 56ba5dc..d7a078f 100644
--- a/game/common/map/terrain/terrain.png.import
+++ b/game/art/terrain/terrain.png.import
@@ -3,15 +3,15 @@
 importer="texture"
 type="CompressedTexture2D"
 uid="uid://cmw0pvjthnn8c"
-path="res://.godot/imported/terrain.png-c443b8a709ca7acc4b3bb3df1d3095a9.ctex"
+path="res://.godot/imported/terrain.png-06c63c2b87b3131a2067f668f87a9d67.ctex"
 metadata={
 "vram_texture": false
 }
 
 [deps]
 
-source_file="res://common/map/terrain/terrain.png"
-dest_files=["res://.godot/imported/terrain.png-c443b8a709ca7acc4b3bb3df1d3095a9.ctex"]
+source_file="res://art/terrain/terrain.png"
+dest_files=["res://.godot/imported/terrain.png-06c63c2b87b3131a2067f668f87a9d67.ctex"]
 
 [params]
 
@@ -25,7 +25,7 @@ mipmaps/generate=true
 mipmaps/limit=-1
 roughness/mode=0
 roughness/src_normal=""
-process/fix_alpha_border=true
+process/fix_alpha_border=false
 process/premult_alpha=false
 process/normal_map_invert_y=false
 process/hdr_as_srgb=false
diff --git a/game/art/ui/minimap.png b/game/art/ui/minimap.png
new file mode 100644
index 0000000..9922b28
--- /dev/null
+++ b/game/art/ui/minimap.png
diff --git a/game/art/ui/minimap.png.import b/game/art/ui/minimap.png.import
new file mode 100644
index 0000000..36f22e7
--- /dev/null
+++ b/game/art/ui/minimap.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://c0sm1jfu4kyv3"
+path="res://.godot/imported/minimap.png-05ee44469856e77fd05107fe9e259e25.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://art/ui/minimap.png"
+dest_files=["res://.godot/imported/minimap.png-05ee44469856e77fd05107fe9e259e25.ctex"]
+
+[params]
+
+compress/mode=3
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=2
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=false
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=0
diff --git a/game/art/ui/minimap_frame.png b/game/art/ui/minimap_frame.png
new file mode 100644
index 0000000..21aa2ce
--- /dev/null
+++ b/game/art/ui/minimap_frame.png
diff --git a/game/art/ui/minimap_frame.png.import b/game/art/ui/minimap_frame.png.import
new file mode 100644
index 0000000..3d2aeee
--- /dev/null
+++ b/game/art/ui/minimap_frame.png.import
@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://vr1hq2stk8ny"
+path="res://.godot/imported/minimap_frame.png-3668393435d2582fb1dc8a9598573e80.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://art/ui/minimap_frame.png"
+dest_files=["res://.godot/imported/minimap_frame.png-3668393435d2582fb1dc8a9598573e80.ctex"]
+
+[params]
+
+compress/mode=3
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=2
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=false
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=0
diff --git a/game/common/map/regions.json b/game/common/map/regions.json
new file mode 100644
index 0000000..bbeeb56
--- /dev/null
+++ b/game/common/map/regions.json
@@ -0,0 +1,6 @@
+{
+	"region_europe": ["prov_britain", "prov_ireland", "prov_iceland"],
+	"region_america": ["prov_cuba"],
+	"region_africa": ["prov_madagascar"],
+	"region_asia": ["prov_ceylon", "prov_formosa"]
+}
diff --git a/game/localisation/en_GB/mapmodes.csv b/game/localisation/en_GB/mapmodes.csv
new file mode 100644
index 0000000..c5b1bb0
--- /dev/null
+++ b/game/localisation/en_GB/mapmodes.csv
@@ -0,0 +1,5 @@
+
+,, Test Mapmodes
+mapmode_province,Province Mapmode
+mapmode_region,Region Mapmode
+mapmode_index,Index Mapmode
diff --git a/game/localisation/en_GB/mapmodes.csv.import b/game/localisation/en_GB/mapmodes.csv.import
new file mode 100644
index 0000000..8dd0c09
--- /dev/null
+++ b/game/localisation/en_GB/mapmodes.csv.import
@@ -0,0 +1,3 @@
+[remap]
+
+importer="keep"
diff --git a/game/src/Autoload/Events.gd b/game/src/Autoload/Events.gd
index 040cb06..f4aac70 100644
--- a/game/src/Autoload/Events.gd
+++ b/game/src/Autoload/Events.gd
@@ -4,10 +4,15 @@ var Options = preload("Events/Options.gd").new()
 var Localisation = preload("Events/Localisation.gd").new()
 
 const _province_identifier_file : String = "res://common/map/provinces.json"
+const _region_file : String = "res://common/map/regions.json"
 const _province_shape_file : String = "res://common/map/provinces.png"
 
+# REQUIREMENTS
+# * FS-333, FS-335, FS-341
 func _ready():
 	if MapSingleton.load_province_identifier_file(_province_identifier_file) != OK:
 		push_error("Failed to load province identifiers")
+	if MapSingleton.load_region_file(_region_file) != OK:
+		push_error("Failed to load regions")
 	if MapSingleton.load_province_shape_file(_province_shape_file) != OK:
 		push_error("Failed to load province shapes")
diff --git a/game/src/GameSession/GameSession.tscn b/game/src/GameSession/GameSession.tscn
index 390040e..e270f8a 100644
--- a/game/src/GameSession/GameSession.tscn
+++ b/game/src/GameSession/GameSession.tscn
@@ -7,7 +7,7 @@
 [ext_resource type="PackedScene" uid="uid://byq323jbel48u" path="res://src/GameSession/ProvinceOverviewPanel.tscn" id="5_osjnn"]
 
 [node name="GameSession" type="Node" node_paths=PackedStringArray("_game_session_menu")]
-editor_description = "SS-102"
+editor_description = "SS-102, UI-546"
 script = ExtResource("1_eklvp")
 _game_session_menu = NodePath("GameSessionMenu")
 
@@ -29,6 +29,8 @@ anchor_left = 1.0
 anchor_top = 1.0
 anchor_right = 1.0
 anchor_bottom = 1.0
+offset_left = -350.0
+offset_top = -210.0
 grow_horizontal = 0
 grow_vertical = 0
 
@@ -39,6 +41,11 @@ anchor_right = 0.15625
 offset_top = 0.0
 offset_right = 0.0
 
+[connection signal="map_view_camera_changed" from="MapView" to="MapControlPanel" method="_on_map_view_camera_changed"]
 [connection signal="province_selected" from="MapView" to="ProvinceOverviewPanel" method="_on_province_selected"]
 [connection signal="close_button_pressed" from="GameSessionMenu" to="." method="_on_game_session_menu_close_button_pressed"]
 [connection signal="game_session_menu_button_pressed" from="MapControlPanel" to="." method="_on_game_session_menu_button_pressed"]
+[connection signal="mapmode_changed" from="MapControlPanel" to="MapView" method="_update_colour_texture"]
+[connection signal="minimap_clicked" from="MapControlPanel" to="MapView" method="_on_minimap_clicked"]
+[connection signal="mouse_entered" from="MapControlPanel" to="MapView" method="_on_mouse_exited_viewport"]
+[connection signal="mouse_exited" from="MapControlPanel" to="MapView" method="_on_mouse_entered_viewport"]
diff --git a/game/src/GameSession/MapControlPanel.gd b/game/src/GameSession/MapControlPanel.gd
index ad56536..693890f 100644
--- a/game/src/GameSession/MapControlPanel.gd
+++ b/game/src/GameSession/MapControlPanel.gd
@@ -1,8 +1,46 @@
 extends PanelContainer
 
 signal game_session_menu_button_pressed
+signal mapmode_changed
+signal map_view_camera_changed(near_left : Vector2, far_left : Vector2, far_right : Vector2, near_right : Vector2)
+signal minimap_clicked(pos_clicked : Vector2)
+
+@export var _mapmodes_grid : GridContainer
+
+var _mapmode_button_group : ButtonGroup
+
+# REQUIREMENTS:
+# * UI-550, UI-554
+func _add_mapmode_button(identifier : String) -> void:
+	var button := Button.new()
+	button.text = identifier
+	button.tooltip_text = identifier
+	button.toggle_mode = true
+	button.button_group = _mapmode_button_group
+	_mapmodes_grid.add_child(button)
+	if _mapmode_button_group.get_pressed_button() == null:
+		button.button_pressed = true
+
+func _ready():
+	_mapmode_button_group = ButtonGroup.new()
+	_mapmode_button_group.pressed.connect(_mapmode_pressed)
+	for index in MapSingleton.get_mapmode_count():
+		_add_mapmode_button(MapSingleton.get_mapmode_identifier(index))
 
 # REQUIREMENTS:
 # * UIFUN-10
-func _on_game_session_menu_button_pressed():
+func _on_game_session_menu_button_pressed() -> void:
 	game_session_menu_button_pressed.emit()
+
+# REQUIREMENTS:
+# * SS-76
+# * UIFUN-129, UIFUN-133
+func _mapmode_pressed(button : BaseButton) -> void:
+	MapSingleton.set_mapmode(button.tooltip_text)
+	mapmode_changed.emit()
+
+func _on_map_view_camera_changed(near_left : Vector2, far_left : Vector2, far_right : Vector2, near_right : Vector2) -> void:
+	map_view_camera_changed.emit(near_left, far_left, far_right, near_right)
+
+func _on_minimap_clicked(pos_clicked : Vector2) -> void:
+	minimap_clicked.emit(pos_clicked)
diff --git a/game/src/GameSession/MapControlPanel.tscn b/game/src/GameSession/MapControlPanel.tscn
index 2a0c971..70d7eab 100644
--- a/game/src/GameSession/MapControlPanel.tscn
+++ b/game/src/GameSession/MapControlPanel.tscn
@@ -1,6 +1,9 @@
-[gd_scene load_steps=4 format=3 uid="uid://g524p8lr574w"]
+[gd_scene load_steps=7 format=3 uid="uid://g524p8lr574w"]
 
 [ext_resource type="Script" path="res://src/GameSession/MapControlPanel.gd" id="1_ign64"]
+[ext_resource type="Texture2D" uid="uid://c0sm1jfu4kyv3" path="res://art/ui/minimap.png" id="2_r613r"]
+[ext_resource type="Script" path="res://src/GameSession/Minimap.gd" id="3_s4dml"]
+[ext_resource type="Texture2D" uid="uid://vr1hq2stk8ny" path="res://art/ui/minimap_frame.png" id="4_f1exl"]
 
 [sub_resource type="InputEventAction" id="InputEventAction_5nck3"]
 action = &"ui_cancel"
@@ -8,23 +11,42 @@ action = &"ui_cancel"
 [sub_resource type="Shortcut" id="Shortcut_fc1tk"]
 events = [SubResource("InputEventAction_5nck3")]
 
-[node name="PanelContainer" type="PanelContainer"]
+[node name="MapControlPanel" type="PanelContainer" node_paths=PackedStringArray("_mapmodes_grid")]
 editor_description = "SS-103"
+mouse_filter = 1
 script = ExtResource("1_ign64")
+_mapmodes_grid = NodePath("HBoxContainer/VBoxContainer/MapmodesGrid")
 
 [node name="HBoxContainer" type="HBoxContainer" parent="."]
 layout_mode = 2
+alignment = 2
 
 [node name="VBoxContainer" type="VBoxContainer" parent="HBoxContainer"]
 layout_mode = 2
 
-[node name="MapmodesPlaceholder" type="Label" parent="HBoxContainer/VBoxContainer"]
+[node name="MapmodesGrid" type="GridContainer" parent="HBoxContainer/VBoxContainer"]
+editor_description = "UI-750"
 layout_mode = 2
-text = "MAPMODES"
+columns = 11
 
-[node name="MinimapPlaceholder" type="Label" parent="HBoxContainer/VBoxContainer"]
+[node name="Minimap" type="PanelContainer" parent="HBoxContainer/VBoxContainer"]
+editor_description = "UI-549"
 layout_mode = 2
-text = "MINIMAP"
+mouse_filter = 1
+
+[node name="TextureRect" type="TextureRect" parent="HBoxContainer/VBoxContainer/Minimap"]
+editor_description = "UI-751, FS-338"
+layout_mode = 2
+texture = ExtResource("2_r613r")
+
+[node name="ViewportQuad" type="Control" parent="HBoxContainer/VBoxContainer/Minimap"]
+layout_mode = 2
+mouse_filter = 2
+script = ExtResource("3_s4dml")
+
+[node name="Frame" type="NinePatchRect" parent="HBoxContainer/VBoxContainer/Minimap"]
+layout_mode = 2
+texture = ExtResource("4_f1exl")
 
 [node name="AuxiliaryPanel" type="VBoxContainer" parent="HBoxContainer"]
 editor_description = "UI-761"
@@ -36,4 +58,6 @@ layout_mode = 2
 shortcut = SubResource("Shortcut_fc1tk")
 text = "ESC"
 
+[connection signal="map_view_camera_changed" from="." to="HBoxContainer/VBoxContainer/Minimap/ViewportQuad" method="_on_map_view_camera_changed"]
+[connection signal="minimap_clicked" from="HBoxContainer/VBoxContainer/Minimap/ViewportQuad" to="." method="_on_minimap_clicked"]
 [connection signal="pressed" from="HBoxContainer/AuxiliaryPanel/GameSessionMenuButton" to="." method="_on_game_session_menu_button_pressed"]
diff --git a/game/src/GameSession/MapView.gd b/game/src/GameSession/MapView.gd
index faf90e8..54d8df8 100644
--- a/game/src/GameSession/MapView.gd
+++ b/game/src/GameSession/MapView.gd
@@ -1,6 +1,7 @@
 extends Node3D
 
 signal province_selected(identifier : String)
+signal map_view_camera_changed(near_left : Vector2, far_left : Vector2, far_right : Vector2, near_right : Vector2)
 
 const _action_north : StringName = &"map_north"
 const _action_east : StringName = &"map_east"
@@ -13,17 +14,19 @@ const _action_click : StringName = &"map_click"
 
 const _shader_param_province_index : StringName = &"province_index_tex"
 const _shader_param_province_colour : StringName = &"province_colour_tex"
-const _shader_param_hover_pos : StringName = &"hover_pos"
-const _shader_param_selected_pos : StringName = &"selected_pos"
+const _shader_param_hover_index : StringName = &"hover_index"
+const _shader_param_selected_index : StringName = &"selected_index"
 
 @export var _camera : Camera3D
 
 @export var _cardinal_move_speed : float = 1.0
-@export var _edge_move_threshold: float = 0.15
+@export var _edge_move_threshold: float = 0.02
 @export var _edge_move_speed: float = 2.5
 var _drag_anchor : Vector2
 var _drag_active : bool = false
 
+var _mouse_over_viewport : bool = false
+
 @export var _zoom_target_min : float = 0.2
 @export var _zoom_target_max : float = 5.0
 @export var _zoom_target_step : float = 0.1
@@ -38,38 +41,33 @@ var _map_mesh : MapMesh
 var _map_shader_material : ShaderMaterial
 var _map_image_size : Vector2
 var _map_province_index_image : Image
+var _map_province_colour_image : Image
+var _map_province_colour_texture : ImageTexture
 var _map_mesh_corner : Vector2
 var _map_mesh_dims : Vector2
 
 var _mouse_pos_viewport : Vector2 = Vector2(0.5, 0.5)
 var _mouse_pos_map : Vector2 = Vector2(0.5, 0.5)
+var _viewport_dims : Vector2 = Vector2(1, 1)
 
+# ??? Strange Godot/GDExtension Bug ???
+# Upon first opening a clone of this repo with the Godot Editor,
+# if MapSingleton.get_province_index_image is called before MapMesh
+# is referenced in the script below, then the editor will crash due
+# to a failed HashMap lookup. I'm not sure if this is a bug in the
+# editor, GDExtension, my own extension, or a combination of them.
+# This was an absolute pain to track down. --- hop311
 func _ready():
 	if _camera == null:
 		push_error("MapView's _camera variable hasn't been set!")
 		return
+	_zoom_target = _camera.position.y
 	if _map_mesh_instance == null:
 		push_error("MapView's _map_mesh variable hasn't been set!")
 		return
-	if not _map_mesh_instance.mesh is MapMesh:
-		push_error("Invalid map mesh class: ", _map_mesh_instance.mesh.get_class(), "(expected MapMesh)")
-		return
-	_map_mesh = _map_mesh_instance.mesh
-
-	# Set map mesh size and get bounds
-	_map_image_size = Vector2(Vector2i(MapSingleton.get_width(), MapSingleton.get_height()))
-	_map_mesh.aspect_ratio = _map_image_size.x / _map_image_size.y
-	var map_mesh_aabb := _map_mesh.get_core_aabb() * _map_mesh_instance.transform
-	_map_mesh_corner = Vector2(
-		min(map_mesh_aabb.position.x, map_mesh_aabb.end.x),
-		min(map_mesh_aabb.position.z, map_mesh_aabb.end.z)
-	)
-	_map_mesh_dims = abs(Vector2(
-		map_mesh_aabb.position.x - map_mesh_aabb.end.x,
-		map_mesh_aabb.position.z - map_mesh_aabb.end.z
-	))
 
-	var map_material = _map_mesh_instance.get_active_material(0)
+	# Shader Material
+	var map_material := _map_mesh_instance.get_active_material(0)
 	if map_material == null:
 		push_error("Map mesh is missing material!")
 		return
@@ -77,6 +75,7 @@ func _ready():
 		push_error("Invalid map mesh material class: ", map_material.get_class())
 		return
 	_map_shader_material = map_material
+
 	# Province index texture
 	_map_province_index_image = MapSingleton.get_province_index_image()
 	if _map_province_index_image == null:
@@ -84,22 +83,72 @@ func _ready():
 		return
 	var province_index_texture := ImageTexture.create_from_image(_map_province_index_image)
 	_map_shader_material.set_shader_parameter(_shader_param_province_index, province_index_texture)
+
 	# Province colour texture
-	var province_colour_image = MapSingleton.get_province_colour_image()
-	if province_colour_image == null:
+	_map_province_colour_image = MapSingleton.get_province_colour_image()
+	if _map_province_colour_image == null:
 		push_error("Failed to get province colour image!")
 		return
-	var province_colour_texture := ImageTexture.create_from_image(province_colour_image)
-	_map_shader_material.set_shader_parameter(_shader_param_province_colour, province_colour_texture)
+	_map_province_colour_texture = ImageTexture.create_from_image(_map_province_colour_image)
+	_map_shader_material.set_shader_parameter(_shader_param_province_colour, _map_province_colour_texture)
+
+	if not _map_mesh_instance.mesh is MapMesh:
+		push_error("Invalid map mesh class: ", _map_mesh_instance.mesh.get_class(), "(expected MapMesh)")
+		return
+	_map_mesh = _map_mesh_instance.mesh
+
+	# Set map mesh size and get bounds
+	_map_image_size = Vector2(Vector2i(MapSingleton.get_width(), MapSingleton.get_height()))
+	_map_mesh.aspect_ratio = _map_image_size.x / _map_image_size.y
+	var map_mesh_aabb := _map_mesh.get_core_aabb() * _map_mesh_instance.transform
+	_map_mesh_corner = Vector2(
+		min(map_mesh_aabb.position.x, map_mesh_aabb.end.x),
+		min(map_mesh_aabb.position.z, map_mesh_aabb.end.z)
+	)
+	_map_mesh_dims = abs(Vector2(
+		map_mesh_aabb.position.x - map_mesh_aabb.end.x,
+		map_mesh_aabb.position.z - map_mesh_aabb.end.z
+	))
+
+func _notification(what : int):
+	match what:
+		NOTIFICATION_WM_MOUSE_ENTER: # Mouse inside window
+			_on_mouse_entered_viewport()
+		NOTIFICATION_WM_MOUSE_EXIT: # Mouse out of window
+			_on_mouse_exited_viewport()
+
+func _update_colour_texture() -> void:
+	MapSingleton.update_colour_image()
+	_map_province_colour_texture.update(_map_province_colour_image)
+
+func _world_to_map_coords(pos : Vector3) -> Vector2:
+	return (Vector2(pos.x, pos.z) - _map_mesh_corner) / _map_mesh_dims
+
+func _viewport_to_map_coords(pos_viewport : Vector2) -> Vector2:
+	var ray_origin := _camera.project_ray_origin(pos_viewport)
+	var ray_normal := _camera.project_ray_normal(pos_viewport)
+	# Plane with normal (0,1,0) facing upwards, at a distance 0 from the origin
+	var intersection = Plane(0, 1, 0, 0).intersects_ray(ray_origin, ray_normal)
+	if typeof(intersection) == TYPE_VECTOR3:
+		return _world_to_map_coords(intersection as Vector3)
+	else:
+		# Normals parallel to the xz-plane could cause null intersections,
+		# but the camera's orientation should prevent such normals
+		push_error("Invalid intersection: ", intersection)
+		return Vector2(0.5, 0.5)
 
+# REQUIREMENTS
+# * SS-31
 func _unhandled_input(event : InputEvent):
 	if event.is_action_pressed(_action_click):
 		# Check if the mouse is outside of bounds
 		if _map_mesh.is_valid_uv_coord(_mouse_pos_map):
-			_map_shader_material.set_shader_parameter(_shader_param_selected_pos, _mouse_pos_map)
-			var mouse_pixel_pos := Vector2i(_mouse_pos_map * _map_image_size)
-			var province_identifier := MapSingleton.get_province_identifier_from_pixel_coords(mouse_pixel_pos)
+			var selected_index := MapSingleton.get_province_index_from_uv_coords(_mouse_pos_map)
+			_map_shader_material.set_shader_parameter(_shader_param_selected_index, selected_index)
+			var province_identifier := MapSingleton.get_province_identifier_from_uv_coords(_mouse_pos_map)
 			province_selected.emit(province_identifier)
+		else:
+			print("Clicked outside the map!")
 	elif event.is_action_pressed(_action_drag):
 		if _drag_active:
 			push_warning("Drag being activated while already active!")
@@ -116,6 +165,7 @@ func _unhandled_input(event : InputEvent):
 
 func _physics_process(delta : float):
 	_mouse_pos_viewport = get_viewport().get_mouse_position()
+	_viewport_dims = Vector2(Resolution.get_current_resolution())
 	# Process movement
 	_movement_process(delta)
 	# Keep within map bounds
@@ -124,9 +174,13 @@ func _physics_process(delta : float):
 	_zoom_process(delta)
 	# Orient based on height
 	_update_orientation()
+	# Update viewport on minimap
+	_update_minimap_viewport()
 	# Calculate where the mouse lies on the map
 	_update_mouse_map_position()
 
+# REQUIREMENTS
+# * UIFUN-124
 func _movement_process(delta : float) -> void:
 	var direction : Vector2
 	if _drag_active:
@@ -137,13 +191,18 @@ func _movement_process(delta : float) -> void:
 		direction *= _camera.position.y * delta
 	_camera.position += Vector3(direction.x, 0, direction.y)
 
+# REQUIREMENTS
+# * UIFUN-125
 func _edge_scrolling_vector() -> Vector2:
-	var viewport_dims := Vector2(Resolution.get_current_resolution())
-	var mouse_vector := _mouse_pos_viewport / viewport_dims - Vector2(0.5, 0.5);
-	if pow(mouse_vector.x, 4) + pow(mouse_vector.y, 4) < pow(0.5 - _edge_move_threshold, 4):
+	if not _mouse_over_viewport:
+		return Vector2()
+	var mouse_vector := _mouse_pos_viewport / _viewport_dims - Vector2(0.5, 0.5)
+	if abs(mouse_vector.x) < 0.5 - _edge_move_threshold and abs(mouse_vector.y) < 0.5 - _edge_move_threshold:
 		mouse_vector *= 0
 	return mouse_vector * _edge_move_speed
 
+# REQUIREMENTS
+# * SS-75
 func _cardinal_movement_vector() -> Vector2:
 	var move := Vector2(
 		float(Input.is_action_pressed(_action_east)) - float(Input.is_action_pressed(_action_west)),
@@ -155,6 +214,9 @@ func _clamp_over_map() -> void:
 	_camera.position.x = _map_mesh_corner.x + fposmod(_camera.position.x - _map_mesh_corner.x, _map_mesh_dims.x)
 	_camera.position.z = clamp(_camera.position.z, _map_mesh_corner.y, _map_mesh_corner.y + _map_mesh_dims.y)
 
+# REQUIREMENTS
+# * SS-74
+# * UIFUN-123
 func _zoom_process(delta : float) -> void:
 	var height := _camera.position.y
 	var zoom := _zoom_target - height
@@ -169,17 +231,27 @@ func _update_orientation() -> void:
 	var dir := Vector3(0, -1, -exp(-_camera.position.y * 2.0 + 0.5))
 	_camera.look_at(_camera.position + dir)
 
+func _update_minimap_viewport() -> void:
+	var near_left := _viewport_to_map_coords(Vector2(0, _viewport_dims.y))
+	var far_left := _viewport_to_map_coords(Vector2(0, 0))
+	var far_right := _viewport_to_map_coords(Vector2(_viewport_dims.x, 0))
+	var near_right := _viewport_to_map_coords(_viewport_dims)
+	map_view_camera_changed.emit(near_left, far_left, far_right, near_right)
+
 func _update_mouse_map_position() -> void:
-	var ray_origin := _camera.project_ray_origin(_mouse_pos_viewport)
-	var ray_normal := _camera.project_ray_normal(_mouse_pos_viewport)
-	# Plane with normal (0,1,0) facing upwards, at a distance 0 from the origin
-	var intersection = Plane(0, 1, 0, 0).intersects_ray(ray_origin, ray_normal)
-	if typeof(intersection) == TYPE_VECTOR3:
-		var intersection_vec := intersection as Vector3
-		# This loops both horizontally (good) and vertically (bad)
-		_mouse_pos_map = (Vector2(intersection_vec.x, intersection_vec.z) - _map_mesh_corner) / _map_mesh_dims
-		_map_shader_material.set_shader_parameter(_shader_param_hover_pos, _mouse_pos_map)
-	else:
-		# Normals parallel to the xz-plane could cause null intersections,
-		# but the camera's orientation should prevent such normals
-		push_error("Invalid intersection: ", intersection)
+	_mouse_pos_map = _viewport_to_map_coords(_mouse_pos_viewport)
+	var hover_index := MapSingleton.get_province_index_from_uv_coords(_mouse_pos_map)
+	if _mouse_over_viewport:
+		_map_shader_material.set_shader_parameter(_shader_param_hover_index, hover_index)
+
+func _on_mouse_entered_viewport():
+	_mouse_over_viewport = true
+
+func _on_mouse_exited_viewport():
+	_mouse_over_viewport = false
+
+func _on_minimap_clicked(pos_clicked : Vector2):
+	pos_clicked *= _map_mesh_dims
+	_camera.position.x = pos_clicked.x
+	_camera.position.z = pos_clicked.y
+	_clamp_over_map()
\ No newline at end of file
diff --git a/game/src/GameSession/MapView.tscn b/game/src/GameSession/MapView.tscn
index 4650acb..93fc162 100644
--- a/game/src/GameSession/MapView.tscn
+++ b/game/src/GameSession/MapView.tscn
@@ -2,26 +2,28 @@
 
 [ext_resource type="Script" path="res://src/GameSession/MapView.gd" id="1_exccw"]
 [ext_resource type="Shader" path="res://src/GameSession/TerrainMap.gdshader" id="1_upocn"]
-[ext_resource type="Texture2D" uid="uid://cmw0pvjthnn8c" path="res://common/map/terrain/terrain.png" id="3_l8pnf"]
+[ext_resource type="Texture2D" uid="uid://cmw0pvjthnn8c" path="res://art/terrain/terrain.png" id="3_l8pnf"]
 
 [sub_resource type="ShaderMaterial" id="ShaderMaterial_tayeg"]
 render_priority = 0
 shader = ExtResource("1_upocn")
-shader_parameter/hover_pos = Vector2(0.5, 0.5)
-shader_parameter/selected_pos = Vector2(0.5, 0.5)
+shader_parameter/hover_index = null
+shader_parameter/selected_index = null
 shader_parameter/terrain_tex = ExtResource("3_l8pnf")
 
 [sub_resource type="MapMesh" id="MapMesh_3gtsd"]
 
 [node name="MapView" type="Node3D" node_paths=PackedStringArray("_camera", "_map_mesh_instance")]
+editor_description = "SS-73"
 script = ExtResource("1_exccw")
 _camera = NodePath("MapCamera")
 _map_mesh_instance = NodePath("MapMeshInstance")
 
 [node name="MapCamera" type="Camera3D" parent="."]
-transform = Transform3D(1, 0, 0, 0, 0.707107, 0.707107, 0, -0.707107, 0.707107, 0, 1, 1)
+transform = Transform3D(1, 0, 0, 0, 0.707107, 0.707107, 0, -0.707107, 0.707107, 0.25, 1.5, -2.75)
 
 [node name="MapMeshInstance" type="MeshInstance3D" parent="."]
+editor_description = "FS-343"
 transform = Transform3D(10, 0, 0, 0, 10, 0, 0, 0, 10, 0, 0, 0)
 material_override = SubResource("ShaderMaterial_tayeg")
 mesh = SubResource("MapMesh_3gtsd")
diff --git a/game/src/GameSession/Minimap.gd b/game/src/GameSession/Minimap.gd
new file mode 100644
index 0000000..25c7cac
--- /dev/null
+++ b/game/src/GameSession/Minimap.gd
@@ -0,0 +1,89 @@
+extends Control
+
+signal minimap_clicked(pos_clicked : Vector2)
+
+const _action_click : StringName = &"map_click"
+
+var _viewport_points : PackedVector2Array
+
+# REQUIREMENTS
+# * SS-80
+# * UI-752
+func _draw() -> void:
+	if _viewport_points.size() > 1:
+		draw_multiline(_viewport_points, Color.WHITE, -1)
+
+# REQUIREMENTS
+# * SS-81
+# * UIFUN-127
+func _unhandled_input(event : InputEvent):
+	if event is InputEventMouse and Input.is_action_pressed(_action_click):
+		var pos_clicked := get_local_mouse_position() / size - Vector2(0.5, 0.5)
+		if abs(pos_clicked.x) < 0.5 and abs(pos_clicked.y) < 0.5:
+			minimap_clicked.emit(pos_clicked)
+
+# Returns the point on the line going through p and q with the specific x coord
+func _intersect_x(p : Vector2, q : Vector2, x : float) -> Vector2:
+	if p.x == q.x:
+		return Vector2(x, 0.5 * (p.y + q.y))
+	var t := (x - q.x) / (p.x - q.x)
+	return q + t * (p - q)
+
+# Returns the point on the line going through p and q with the specific y coord
+func _intersect_y(p : Vector2, q : Vector2, y : float) -> Vector2:
+	if p.y == q.y:
+		return Vector2(0.5 * (p.x + q.x), y)
+	var t := (y - q.y) / (p.y - q.y)
+	return q + t * (p - q)
+
+const _one_x := Vector2(1, 0)
+
+func _add_line_looped_over_x(left : Vector2, right : Vector2) -> void:
+	if left.x < 0:
+		if right.x < 0:
+			_viewport_points.push_back(left + _one_x)
+			_viewport_points.push_back(right + _one_x)
+		else:
+			var mid_point := _intersect_x(left, right, 0)
+			_viewport_points.push_back(mid_point)
+			_viewport_points.push_back(right)
+			mid_point.x = 1
+			_viewport_points.push_back(left + _one_x)
+			_viewport_points.push_back(mid_point)
+	elif right.x > 1:
+		if left.x > 1:
+			_viewport_points.push_back(left - _one_x)
+			_viewport_points.push_back(right - _one_x)
+		else:
+			var mid_point := _intersect_x(left, right, 1)
+			_viewport_points.push_back(left)
+			_viewport_points.push_back(mid_point)
+			mid_point.x = 0
+			_viewport_points.push_back(mid_point)
+			_viewport_points.push_back(right - _one_x)
+	else:
+		_viewport_points.push_back(left)
+		_viewport_points.push_back(right)
+
+# This can break if the viewport is rotated too far!
+func _on_map_view_camera_changed(near_left : Vector2, far_left : Vector2, far_right : Vector2, near_right : Vector2) -> void:
+	# Bound far y coords
+	if far_left.y < 0:
+		far_left = _intersect_y(near_left, far_left, 0)
+	if far_right.y < 0:
+		far_right = _intersect_y(near_right, far_right, 0)
+	# Bound near y coords
+	if near_left.y > 1:
+		near_left = _intersect_y(near_left, far_left, 1)
+	if near_right.y > 1:
+		near_right = _intersect_y(near_right, far_right, 1)
+
+	_viewport_points.clear()
+	_add_line_looped_over_x(near_left, near_right)
+	_add_line_looped_over_x(far_left, far_right)
+	_add_line_looped_over_x(far_left, near_left)
+	_add_line_looped_over_x(near_right, far_right)
+
+	for i in _viewport_points.size():
+		_viewport_points[i] *= size
+	queue_redraw()
diff --git a/game/src/GameSession/ProvinceOverviewPanel.tscn b/game/src/GameSession/ProvinceOverviewPanel.tscn
index e21b1c3..2df95fb 100644
--- a/game/src/GameSession/ProvinceOverviewPanel.tscn
+++ b/game/src/GameSession/ProvinceOverviewPanel.tscn
@@ -3,6 +3,7 @@
 [ext_resource type="Script" path="res://src/GameSession/ProvinceOverviewPanel.gd" id="1_3n8k5"]
 
 [node name="ProvinceOverviewPanel" type="Panel" node_paths=PackedStringArray("_province_name_label")]
+editor_description = "UI-56"
 anchors_preset = 2
 anchor_top = 1.0
 anchor_bottom = 1.0
@@ -23,6 +24,7 @@ offset_right = -10.0
 offset_bottom = -5.0
 
 [node name="ProvinceName" type="Label" parent="VBoxContainer"]
+editor_description = "UI-57"
 layout_mode = 2
 text = "PROVINCE_NAME"
 vertical_alignment = 1
diff --git a/game/src/GameSession/TerrainMap.gdshader b/game/src/GameSession/TerrainMap.gdshader
index a6774fd..7aca0f9 100644
--- a/game/src/GameSession/TerrainMap.gdshader
+++ b/game/src/GameSession/TerrainMap.gdshader
@@ -8,10 +8,10 @@ uniform sampler2D terrain_tex: source_color, repeat_enable, filter_linear;
 uniform sampler2D province_index_tex : repeat_enable, filter_nearest;
 // Province colour texture
 uniform sampler2D province_colour_tex: source_color, repeat_enable, filter_nearest;
-// Position of the mouse over the map mesh in UV coords
-uniform vec2 hover_pos;
-// Position in UV coords of a pixel belonging to the currently selected province
-uniform vec2 selected_pos;
+// Index of the mouse over the map mesh
+uniform uint hover_index;
+// Index of the currently selected province
+uniform uint selected_index;
 
 uvec2 vec2_to_uvec2(vec2 v) {
 	return uvec2(v * 255.0);
@@ -31,13 +31,10 @@ uint read_uint16(sampler2D tex, vec2 uv) {
 
 void fragment() {
 	uvec2 prov_idx_split = read_uvec2(province_index_tex, UV);
-
 	uint prov_index = uvec2_to_uint(prov_idx_split);
-	uint hover_index = read_uint16(province_index_tex, hover_pos);
-	uint selected_index = read_uint16(province_index_tex, selected_pos);
 
 	// Boost prov_colour's contribution if it matches hover_colour or selected_colour
-	float mix_val = float(prov_index == hover_index) * 0.3 + float(prov_index == selected_index) * 0.5;
+	float mix_val = 0.3 + float(prov_index == hover_index) * 0.3 + float(prov_index == selected_index) * 0.3;
 	// Don't mix if the province index is 0
 	mix_val *= float(prov_index != 0u);