From 512b396c540e702ad4eef0d9877191211074c643 Mon Sep 17 00:00:00 2001
From: pogokeen <pogokeen@1a8010ca-5511-0410-912e-c29ae57300e0>
Date: Fri, 16 Feb 2018 06:38:40 +0000
Subject: [PATCH] screens.cpp: Fixed a bug in FPS calculation

git-svn-id: https://svn.eduke32.com/eduke32@6660 1a8010ca-5511-0410-912e-c29ae57300e0
---
 source/duke3d/src/screens.cpp | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/source/duke3d/src/screens.cpp b/source/duke3d/src/screens.cpp
index 46ad8599b..252edaf72 100644
--- a/source/duke3d/src/screens.cpp
+++ b/source/duke3d/src/screens.cpp
@@ -782,11 +782,12 @@ static void G_ShowCacheLocks(void)
 
 static void G_PrintFPS(void)
 {
-    static int32_t frameCount = 0, lastFPS = 0, lastFrameTime = 0;
+    static int32_t frameCount = 0, lastFPS = 0, lastFrameTime = 0, cumulativeFrameDelay = 0;
     static int32_t minFPS = -1, maxFPS = 0;
 
     int32_t frameTime = getticks();
     int32_t frameDelay = frameTime - lastFrameTime;
+    cumulativeFrameDelay += frameDelay;
 
     if (frameDelay >= 0)
     {
@@ -826,13 +827,11 @@ static void G_PrintFPS(void)
             }
         }
 
-        int32_t const thisSec = tabledivide32_noinline(frameTime, 1000);
-        int32_t const lastSec = tabledivide32_noinline(lastFrameTime, 1000);
-
-        if (thisSec - lastSec)
+        if (cumulativeFrameDelay >= 1000)
         {
-            g_frameRate = lastFPS = tabledivide32_noinline(frameCount, thisSec - lastSec);
+            g_frameRate = lastFPS = tabledivide32_noinline(1000*frameCount, cumulativeFrameDelay);
             frameCount = 0;
+            cumulativeFrameDelay = 0;
 
             if (ud.showfps > 1)
             {