test app loop

hw3d/App.cpp

 #include "App.h"
+#include <sstream>
+#include <iomanip>
 
 App::App()
 	:
@@ -30,5 +32,8 @@ int App::Go()
 
 void App::DoFrame()
 {
-
+	const float t = timer.Peek();
+	std::ostringstream oss;
+	oss << "Time elapsed: " << std::setprecision( 1 ) << std::fixed << t << "s";
+	wnd.SetTitle( oss.str() );
 }
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hw3d/App.h

 #pragma once
 #include "Window.h"
+#include "ChiliTimer.h"
 
 class App
 {
@@ -11,4 +12,5 @@ private:
 	void DoFrame();
 private:
 	Window wnd;
+	ChiliTimer timer;
 };
\ No newline at end of file