game history

include/td/game/GameHistory.h

@@ -0,0 +1,57 @@
+#pragma once
+
+#include <optional>
+#include <td/protocol/command/Commands.h>
+
+namespace td {
+namespace game {
+
+class GameHistory {
+  private:
+	using HistorySizeType = std::uint16_t;
+
+	std::vector<std::optional<protocol::LockStep>> m_History {std::numeric_limits<HistorySizeType>::max()};
+	
+	HistorySizeType m_Cursor = 0;
+
+  public:
+	GameHistory(){}
+
+	void SetLockStep(HistorySizeType a_Index, protocol::LockStep&& a_LockStep) {
+		m_History[a_Index] = std::move(a_LockStep);
+	}
+
+	const protocol::LockStep& GetLockStep(HistorySizeType a_Index) const {
+		return *m_History[a_Index];
+	}
+
+	bool HasLockStep(HistorySizeType a_Index) const {
+		return m_History[a_Index].has_value();
+	}
+
+	const protocol::LockStep& GetNextStep() {
+		return GetLockStep(m_Cursor++);
+	}
+
+	bool HasNextStep() const {
+		return HasLockStep(m_Cursor);
+	}
+
+	void FromPacket(td::protocol::pdata::LockSteps&& a_Steps) {
+		for (int i = 0; i < LOCKSTEP_BUFFER_SIZE; i++) {
+			protocol::LockStep& step = a_Steps.m_LockSteps[i];
+			SetLockStep(i + a_Steps.m_FirstFrameNumber, std::move(step));
+		}
+	}
+
+	td::protocol::packets::LockSteps ToPacket(HistorySizeType a_StartIndex) {
+		std::array<protocol::LockStep, LOCKSTEP_BUFFER_SIZE> steps;
+		for (int i = 0; i < LOCKSTEP_BUFFER_SIZE; i++) {
+			steps[i] = GetLockStep(a_StartIndex + i);
+		}
+		return {{a_StartIndex, std::move(steps)}};
+	}
+};
+
+}  // namespace game
+}  // namespace td