feat: implement TickSystem for managing world ticks and initialize World constructor

Signed-off-by: szdytom <szdytom@qq.com>

core/include/istd_core/world.h

@@ -2,17 +2,21 @@
 #define ISTD_CORE_WORLD_H
 
 #include "istd_core/room.h"
+#include "tilemap/generation.h"
 #include "tilemap/tilemap.h"
 #include <vector>
 
 namespace istd {
 
 struct World {
+	std::uint32_t tick;
 	TileMap tilemap;
 	std::vector<std::vector<Room>> rooms;
 	entt::registry registry;
 
 	World(std::uint8_t size);
+
+	void generateTilemap(const GenerationConfig &config);
 };
 
 } // namespace istd

core/src/world.cpp

@@ -0,0 +1,39 @@
+#include "istd_core/world.h"
+#include "istd_core/system.h"
+#include "tilemap/generation.h"
+
+namespace istd {
+
+namespace {
+
+struct TickSystem : public System {
+	void tick(World &world) const noexcept override {
+		world.tick += 1;
+	}
+
+	std::string_view name() const noexcept override {
+		return "Tick System";
+	}
+};
+
+static const TickSystem tick_system;
+static const SystemRegistry::Registar tick_registrar(
+	System::Precedence::Highest, &tick_system
+);
+
+} // namespace
+
+World::World(std::uint8_t size)
+	: tick(0), tilemap(size), rooms(size, std::vector<Room>(size, {0, 0})) {
+	for (std::uint8_t x = 0; x < size; ++x) {
+		for (std::uint8_t y = 0; y < size; ++y) {
+			rooms[x][y] = {x, y};
+		}
+	}
+}
+
+void World::generateTilemap(const GenerationConfig &config) {
+	map_generate(tilemap, config);
+}
+
+} // namespace istd