add chili timer

hw3d/ChiliTimer.cpp

+#include "ChiliTimer.h"
+
+using namespace std::chrono;
+
+ChiliTimer::ChiliTimer()
+{
+	last = steady_clock::now();
+}
+
+float ChiliTimer::Mark()
+{
+	const auto old = last;
+	last = steady_clock::now();
+	const duration<float> frameTime = last - old;
+	return frameTime.count();
+}
+
+float ChiliTimer::Peek() const
+{
+	return duration<float>( steady_clock::now() - last ).count();
+}

hw3d/ChiliTimer.h

+#pragma once
+#include <chrono>
+
+class ChiliTimer
+{
+public:
+	ChiliTimer();
+	float Mark();
+	float Peek() const;
+private:
+	std::chrono::steady_clock::time_point last;
+};
\ No newline at end of file

hw3d/hw3d.vcxproj

@@ -147,6 +147,7 @@
   <ItemGroup>
     <ClCompile Include="App.cpp" />
     <ClCompile Include="ChiliException.cpp" />
+    <ClCompile Include="ChiliTimer.cpp" />
     <ClCompile Include="Keyboard.cpp" />
     <ClCompile Include="Mouse.cpp" />
     <ClCompile Include="Window.cpp" />
@@ -156,6 +157,7 @@
   <ItemGroup>
     <ClInclude Include="App.h" />
     <ClInclude Include="ChiliException.h" />
+    <ClInclude Include="ChiliTimer.h" />
     <ClInclude Include="ChiliWin.h" />
     <ClInclude Include="Keyboard.h" />
     <ClInclude Include="Mouse.h" />

hw3d/hw3d.vcxproj.filters

@@ -36,6 +36,9 @@
     <ClCompile Include="App.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="ChiliTimer.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="WindowsMessageMap.h">
@@ -62,6 +65,9 @@
     <ClInclude Include="App.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="ChiliTimer.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ResourceCompile Include="hw3d.rc">