--- /dev/null
+#ifndef GONG_PHYSICS_SIMULATION_HPP_
+#define GONG_PHYSICS_SIMULATION_HPP_
+
+#include "../graphics/glm.hpp"
+
+#include <vector>
+
+
+namespace gong {
+namespace physics {
+
+struct Derivative;
+struct Object;
+struct State;
+
+class Simulation {
+
+public:
+ void Update(float dt);
+
+private:
+ void Integrate(State &, float dt);
+ Derivative Evaluate(const State &, float dt, const Derivative &);
+
+private:
+ std::vector<Object *> objects;
+ glm::vec3 gravity;
+
+};
+
+}
+}
+
+#endif