Adding Spectre/System/Stopwatch

engine.build.lua

@@ -34,7 +34,8 @@ local system_module = Module("source/System", {
 	"MessageQueue.cpp",
 	"Event.cpp",
 	"EventListener.cpp",
-	"Log.cpp"
+	"Log.cpp",
+	"Stopwatch.cpp"
 })
 
 local platform_common_module = Module("source/Platform", {

include/Spectre/System/Stopwatch.h

@@ -0,0 +1,27 @@
+
+#ifndef SPECTRE_SYSTEM_STOPWATCH_H
+#define SPECTRE_SYSTEM_STOPWATCH_H
+
+#include <Spectre/Math/Time.h>
+
+namespace sp {
+
+class Stopwatch {
+public :
+	Stopwatch();
+
+	// Restart the watch. also returns the elapsed time before
+	// the watch was restarted.
+	Time restart();
+
+	// Get the elapsed time since the watch was restarted.
+	Time elapsed() const;
+
+private :
+
+	Time m_start;
+};
+
+} // namespace sp
+
+#endif /* SPECTRE_SYSTEM_STOPWATCH_H */

source/System/Stopwatch.cpp

@@ -0,0 +1,25 @@
+
+#include <Spectre/System/Stopwatch.h>
+#include <Spectre/System/System.h>
+
+namespace sp {
+
+Stopwatch::Stopwatch()
+{
+	m_start = Time::milliseconds(system::getMilliseconds());
+}
+
+Time Stopwatch::restart()
+{
+	Time now = Time::milliseconds(system::getMilliseconds());
+	Time elapsed = now - m_start;
+	m_start = now;
+	return elapsed;
+}
+
+Time Stopwatch::elapsed() const
+{
+	return Time::milliseconds(system::getMilliseconds()) - m_start;
+}
+
+} // namespace sp