From 321103ea84cf61f58a26d59700284d84f11833f5 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sat, 15 Jun 2024 17:35:13 +0100
Subject: Move main application loop into the library

---
 application/main.cpp   | 37 ++++---------------------------------
 ui/mainApplication.cpp | 34 ++++++++++++++++++++++++++++++++++
 ui/mainApplication.h   | 18 ++++++++++++++++++
 3 files changed, 56 insertions(+), 33 deletions(-)
 create mode 100644 ui/mainApplication.cpp
 create mode 100644 ui/mainApplication.h

diff --git a/application/main.cpp b/application/main.cpp
index 04c88f3..d58cf6d 100644
--- a/application/main.cpp
+++ b/application/main.cpp
@@ -1,7 +1,7 @@
+#include "ui/mainApplication.h"
 #include "ui/mainWindow.h"
 #include <array>
 #include <assetFactory/assetFactory.h>
-#include <chrono>
 #include <collection.h>
 #include <game/activities/go.h>
 #include <game/activities/idle.h>
@@ -32,16 +32,13 @@
 static const int DISPLAY_WIDTH = 1280;
 static const int DISPLAY_HEIGHT = 1024;
 
-class MainApplication : public GameState, public ApplicationBase {
+class DummyMainApplication : public GameState, public MainApplication {
 public:
-	using Windows = Collection<Window>;
-
 	int
 	run()
 	{
 		geoData = std::make_shared<GeoData>(GeoData::loadFromAsciiGrid("test/fixtures/height/SD19.asc"));
 
-		Windows windows;
 		windows.create<MainWindow>(DISPLAY_WIDTH, DISPLAY_HEIGHT)->setContent<GameMainWindow>();
 
 		world.create<Terrain>(geoData);
@@ -90,41 +87,15 @@ public:
 			}
 		}
 
-		auto t_start = std::chrono::high_resolution_clock::now();
-		while (isRunning) {
-			processInputs(windows);
-			const auto t_end = std::chrono::high_resolution_clock::now();
-			const auto t_passed = std::chrono::duration_cast<TickDuration>(t_end - t_start);
-
-			world.apply(&WorldObject::tick, t_passed);
-			windows.apply(&Window::tick, t_passed);
-			windows.apply(&Window::refresh);
-
-			t_start = t_end;
-		}
+		mainLoop();
 
 		world.objects.clear();
 		return 0;
 	}
-
-private:
-	void
-	processInputs(const Windows & windows)
-	{
-		for (SDL_Event e; SDL_PollEvent(&e);) {
-			if (e.type == SDL_QUIT) {
-				isRunning = false;
-				return;
-			}
-			windows.applyOne(&Window::handleInput, e);
-		}
-	}
-
-	bool isRunning {true};
 };
 
 int
 main(int, char **)
 {
-	return std::make_shared<MainApplication>()->run();
+	return std::make_shared<DummyMainApplication>()->run();
 }
diff --git a/ui/mainApplication.cpp b/ui/mainApplication.cpp
new file mode 100644
index 0000000..08f49a4
--- /dev/null
+++ b/ui/mainApplication.cpp
@@ -0,0 +1,34 @@
+#include "mainApplication.h"
+#include "game/gamestate.h"
+#include "game/worldobject.h"
+
+void
+MainApplication::mainLoop()
+{
+	auto t_start = std::chrono::high_resolution_clock::now();
+	while (isRunning) {
+		processInputs();
+		const auto t_end = std::chrono::high_resolution_clock::now();
+		const auto t_passed = std::chrono::duration_cast<TickDuration>(t_end - t_start);
+
+		if (gameState) {
+			gameState->world.apply(&WorldObject::tick, t_passed);
+		}
+		windows.apply(&Window::tick, t_passed);
+		windows.apply(&Window::refresh);
+
+		t_start = t_end;
+	}
+}
+
+void
+MainApplication::processInputs()
+{
+	for (SDL_Event e; SDL_PollEvent(&e);) {
+		if (e.type == SDL_QUIT) {
+			isRunning = false;
+			return;
+		}
+		windows.applyOne(&Window::handleInput, e);
+	}
+}
diff --git a/ui/mainApplication.h b/ui/mainApplication.h
new file mode 100644
index 0000000..a6cb126
--- /dev/null
+++ b/ui/mainApplication.h
@@ -0,0 +1,18 @@
+#pragma once
+
+#include "applicationBase.h"
+#include "collection.h"
+#include "window.h"
+
+class MainApplication : public ApplicationBase {
+public:
+	using Windows = Collection<Window>;
+	void mainLoop();
+
+protected:
+	Windows windows;
+
+private:
+	void processInputs();
+	bool isRunning {true};
+};
-- 
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