Initial commit

source/Game/FPSCounter.cpp

@@ -0,0 +1,55 @@
+
+#include <Spectre/Game/FPSCounter.h>
+#include <Spectre/System/System.h>
+
+FPSCounter::FPSCounter() :
+m_fps		(60.0f),
+m_updateRate	(2000)
+{
+	reset();
+}
+
+void FPSCounter::addFrame()
+{
+	m_count++;
+}
+
+float FPSCounter::getFPS() const
+{
+	return m_fps;
+}
+
+void FPSCounter::setUpdateRate(unsigned int ups)
+{
+	// Clamp to 1.
+	if (ups < 1) {
+		ups = 1;
+	}
+	
+	m_updateRate = ups * 1000;
+
+	// Must reset the counter.
+	reset();
+}
+
+bool FPSCounter::update()
+{
+	unsigned int current = System::getMilliseconds();
+	unsigned int elapsed = current - m_time;
+
+	if (elapsed >= m_updateRate) {
+		float fraction = m_count / ((float) elapsed);
+		m_fps = fraction * 1000.f;
+
+		m_time = current;
+		m_count = 0;
+		return true;
+	}
+	return false;
+}
+
+void FPSCounter::reset()
+{
+	m_time = System::getMilliseconds();
+	m_count = 0;
+}