From 2dd2aead13f62a3658bdddb3777a383a19949c97 Mon Sep 17 00:00:00 2001
From: Kayne Ruse <kayneruse@gmail.com>
Date: Sun, 23 Aug 2015 01:52:03 +1000
Subject: [PATCH] Tweaked FPS implementation

---
 utilities/frame_rate.hpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/utilities/frame_rate.hpp b/utilities/frame_rate.hpp
index 3a52c2f..31970db 100644
--- a/utilities/frame_rate.hpp
+++ b/utilities/frame_rate.hpp
@@ -28,16 +28,21 @@ public:
 	typedef std::chrono::high_resolution_clock Clock;
 
 	FrameRate() = default;
+
+	//DOCS: for usage purposes, this returns -1 unless a new framerate value is set
 	int Calculate() {
 		frameCount++;
 		if (Clock::now() - tick >= std::chrono::duration<int>(1)) {
 			lastFrameRate = frameCount;
 			frameCount = 0;
 			tick = Clock::now();
+			return lastFrameRate;
 		}
-		return lastFrameRate;
+		return -1;
 	}
+
 	int GetFrameRate() { return lastFrameRate; }
+
 private:
 	int frameCount = 0;
 	int lastFrameRate = 0;