2 files changed, 109 insertions, 0 deletions
diff --git a/extension/src/openvic2/GameAdvancementHook.cpp b/extension/src/openvic2/GameAdvancementHook.cpp
new file mode 100644
index 0000000..3db3224
--- /dev/null
+++ b/extension/src/openvic2/GameAdvancementHook.cpp
@@ -0,0 +1,69 @@
+#include "GameAdvancementHook.hpp"
+
+namespace OpenVic2 {
+	GameAdvancementHook::GameAdvancementHook(AdvancementFunction function, bool startPaused, GameSpeed startingSpeed) {
+		triggerFunction = function;
+		lastPolledTime = std::chrono::high_resolution_clock::now();
+		isPaused = startPaused;
+		currentSpeed = startingSpeed;
+	}
+
+	void GameAdvancementHook::increaseSimulationSpeed() {
+		switch (currentSpeed) {
+		case(GameSpeed::Speed1):
+			currentSpeed = GameSpeed::Speed2;
+			break;
+		case(GameSpeed::Speed2):
+			currentSpeed = GameSpeed::Speed3;
+			break;
+		case(GameSpeed::Speed3):
+			currentSpeed = GameSpeed::Speed4;
+			break;
+		case(GameSpeed::Speed4):
+			currentSpeed = GameSpeed::Speed5;
+			break;
+		}
+	}
+
+	void GameAdvancementHook::decreaseSimulationSpeed() {
+		switch (currentSpeed) {
+		case(GameSpeed::Speed2):
+			currentSpeed = GameSpeed::Speed1;
+			break;
+		case(GameSpeed::Speed3):
+			currentSpeed = GameSpeed::Speed2;
+			break;
+		case(GameSpeed::Speed4):
+			currentSpeed = GameSpeed::Speed3;
+			break;
+		case(GameSpeed::Speed5):
+			currentSpeed = GameSpeed::Speed4;
+			break;
+		}
+	}
+
+	GameAdvancementHook GameAdvancementHook::operator++(int) {
+		GameAdvancementHook oldCopy = *this;
+		increaseSimulationSpeed();
+		return oldCopy;
+	};
+
+	GameAdvancementHook GameAdvancementHook::operator--(int) {
+		GameAdvancementHook oldCopy = *this;
+		decreaseSimulationSpeed();
+		return oldCopy;
+	};
+
+	void GameAdvancementHook::conditionallyAdvanceGame() {
+		if (!isPaused) {
+			std::chrono::time_point<std::chrono::high_resolution_clock> previousTime = lastPolledTime;
+			std::chrono::time_point<std::chrono::high_resolution_clock> currentTime = std::chrono::high_resolution_clock::now();
+			if (std::chrono::duration_cast<std::chrono::milliseconds>(currentTime - previousTime).count() >= static_cast<int64_t>(currentSpeed)) {
+				lastPolledTime = currentTime;
+				if (triggerFunction) {
+					triggerFunction();
+				}
+			}
+		}
+	}
+}
+\ No newline at end of file
diff --git a/extension/src/openvic2/GameAdvancementHook.hpp b/extension/src/openvic2/GameAdvancementHook.hpp
new file mode 100644
index 0000000..72af4ac
--- /dev/null
+++ b/extension/src/openvic2/GameAdvancementHook.hpp
@@ -0,0 +1,40 @@
+#pragma once
+
+#include <chrono>
+#include <functional>
+
+namespace OpenVic2 {
+	//Value of different game speeds are the minimum number of miliseconds before the simulation advances
+	enum class GameSpeed {
+		Speed1 = 4000,
+		Speed2 = 3000,
+		Speed3 = 2000,
+		Speed4 = 1000,
+		Speed5 = 100,
+		Speed6 = 1
+	};
+
+	//Conditionally advances game with provided behaviour
+	//Class governs game speed and pause state
+	class GameAdvancementHook {
+		public:
+		using AdvancementFunction = std::function<void()>;
+
+		private:
+		std::chrono::time_point<std::chrono::high_resolution_clock> lastPolledTime;
+		//A function pointer that advances the simulation, intended to be a capturing lambda or something similar. May need to be reworked later
+		AdvancementFunction triggerFunction;
+
+		public:
+		bool isPaused;
+		GameSpeed currentSpeed;
+
+		GameAdvancementHook(AdvancementFunction function = nullptr, bool startPaused = false, GameSpeed startingSpeed = GameSpeed::Speed1);
+
+		void increaseSimulationSpeed();
+		void decreaseSimulationSpeed();
+		GameAdvancementHook operator++(int);
+		GameAdvancementHook operator--(int);
+		void conditionallyAdvanceGame();
+	};
+}
+\ No newline at end of file