too many things

src/td/simulation/RealTimeSimulation.cpp

@@ -0,0 +1,32 @@
+#include <td/simulation/RealTimeSimulation.h>
+
+#include <chrono>
+
+namespace td {
+namespace sim {
+
+std::uint64_t GetTime() {
+	return static_cast<std::uint64_t>(
+		std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock().now().time_since_epoch()).count());
+}
+
+RealTimeSimulation::RealTimeSimulation(game::World& a_World, GameHistory&& a_History, std::uint64_t a_StepTime) :
+	m_StepTime(a_StepTime),
+	m_World(a_World),
+	m_History(std::move(a_History)),
+	m_CurrentTime(0),
+	m_LastTime(GetTime()),
+	m_CurrentStep(0) {}
+
+void RealTimeSimulation::Update() {
+	m_CurrentTime += GetTime() - m_LastTime;
+	m_LastTime = GetTime();
+	if (m_CurrentTime > m_StepTime) {
+		m_World.Tick(m_History[m_CurrentStep], FpFloat(m_StepTime) / FpFloat(1000));
+		m_CurrentStep++;
+		m_CurrentTime -= m_StepTime;
+	}
+}
+
+}  // namespace sim
+}  // namespace td