too many things

include/td/simulation/WorldTicker.h

@@ -0,0 +1,40 @@
+#pragma once
+
+#include <td/protocol/command/Commands.h>
+#include <td/simulation/WorldSnapshot.h>
+
+namespace td {
+namespace game {
+class World;
+}
+
+namespace sim {
+
+class IWorldSystem {
+  public:
+	virtual void Tick(const game::World& a_World, WorldSnapshot& a_State, FpFloat a_Delta) = 0;
+};
+
+class WorldTicker {
+  private:
+	std::vector<std::unique_ptr<IWorldSystem>> m_Systems;
+
+  public:
+	WorldTicker();
+
+	WorldSnapshot NextStep(
+		const game::World& a_World, const WorldSnapshot& a_PreviousState, const protocol::LockStep& a_LockStep, FpFloat a_Delta);
+
+  private:
+	void ApplySteps(const game::World& a_World, WorldSnapshot& a_State, const protocol::LockStep& a_LockStep);
+	void Tick(const game::World& a_World, WorldSnapshot& a_State, FpFloat a_Delta);
+	WorldSnapshot CreateNext(const WorldSnapshot& a_PreviousState);
+
+	template <typename T>
+	void AddSystem() {
+		m_Systems.push_back(std::move(std::make_unique<T>()));
+	}
+};
+
+}  // namespace sim
+}  // namespace td