From c05b299e016ea55fa21538e6bee1e913221a650d Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Sun, 22 May 2022 21:31:44 +0200
Subject: feat: add update speed limit

---
 src/engine/engine.cpp | 20 ++++++++++++++++++++
 src/engine/engine.hpp |  2 ++
 2 files changed, 22 insertions(+)

(limited to 'src')

diff --git a/src/engine/engine.cpp b/src/engine/engine.cpp
index fda1fc2..774220a 100644
--- a/src/engine/engine.cpp
+++ b/src/engine/engine.cpp
@@ -2,6 +2,7 @@
 
 #include "util/function.hpp"
 
+#include <chrono>
 #include <thread>
 #include <utility>
 
@@ -45,9 +46,28 @@ void CLIGameEngine::start() noexcept
 			_input_handler->listen();
 		}));
 
+	auto last_update_time = std::chrono::system_clock::now();
+
+	const auto get_millis_since_update = [&last_update_time]()
+	{
+		return std::chrono::duration_cast<std::chrono::milliseconds>(
+			std::chrono::system_clock::now() - last_update_time);
+	};
+
 	while (true)
 	{
+		const auto time_since_last_update = get_millis_since_update();
+
+		if (time_since_last_update.count() < MIN_TIME_SINCE_LAST_UPDATE_MILLIS)
+		{
+			while (get_millis_since_update().count() < MIN_TIME_SINCE_LAST_UPDATE_MILLIS)
+			{
+			}
+		}
+
 		game->on_update();
+
+		last_update_time = std::chrono::system_clock::now();
 	}
 }
 
diff --git a/src/engine/engine.hpp b/src/engine/engine.hpp
index 7b322b5..1e8a217 100644
--- a/src/engine/engine.hpp
+++ b/src/engine/engine.hpp
@@ -12,6 +12,8 @@
 #include <memory>
 #include <unordered_map>
 
+constexpr auto MIN_TIME_SINCE_LAST_UPDATE_MILLIS = 100;
+
 class CLIGameEngine : public ICLIGameEngine,
 					  public yacppdic::AutoWirable<
 						  ICLIGameEngine,
-- 
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