Imported update to FrameRate

common/frame_rate.cpp

@@ -0,0 +1,26 @@
+/* Copyright: (c) Kayne Ruse 2013
+ * 
+ * This software is provided 'as-is', without any express or implied
+ * warranty. In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ * 
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ * 
+ * 1. The origin of this software must not be misrepresented; you must not
+ * claim that you wrote the original software. If you use this software
+ * in a product, an acknowledgment in the product documentation would be
+ * appreciated but is not required.
+ * 
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ * misrepresented as being the original software.
+ * 
+ * 3. This notice may not be removed or altered from any source
+ * distribution.
+*/
+#include "frame_rate.hpp"
+
+int FrameRate::frameCount = 0;
+int FrameRate::lastFrameRate = 0;
+FrameRate::Clock::time_point FrameRate::tick = FrameRate::Clock::now();

common/frame_rate.hpp

@@ -22,29 +22,27 @@
 #ifndef FRAMERATE_HPP_
 #define FRAMERATE_HPP_
 
-#include <ctime>
+#include <chrono>
 
 class FrameRate {
 public:
-	FrameRate() {
-		frameCount = lastFrameRate = tick = 0;
-	}
-	int Calculate() {
+	typedef std::chrono::high_resolution_clock Clock;
+
+	FrameRate() = delete;
+	static int Calculate() {
 		frameCount++;
-		if (clock() - tick >= CLOCKS_PER_SEC) {
+		if (Clock::now() - tick >= std::chrono::duration<int>(1)) {
 			lastFrameRate = frameCount;
 			frameCount = 0;
-			tick = clock();
+			tick = Clock::now();
 		}
 		return lastFrameRate;
 	}
-	int GetFrameRate() const {
-		return lastFrameRate;
-	}
+	static int GetFrameRate() { return lastFrameRate; }
 private:
-	int frameCount;
-	int lastFrameRate;
-	int tick;
+	static int frameCount;
+	static int lastFrameRate;
+	static Clock::time_point tick;
 };
 
 #endif