From c5775edc95bd70ca1c9429f9e9e039b9000b8516 Mon Sep 17 00:00:00 2001
From: Rachael Alexanderson <raa-eruanna@users.noreply.github.com>
Date: Tue, 14 Nov 2017 16:36:21 -0500
Subject: [PATCH] - fixed: Reset the renderer timer to 0 at the start of
 render. This prevents screen jankiness with systems at longer than ~2 days
 uptime.

---
 src/d_main.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/d_main.cpp b/src/d_main.cpp
index 540b002b3..f94d158b5 100644
--- a/src/d_main.cpp
+++ b/src/d_main.cpp
@@ -779,7 +779,10 @@ void D_Display ()
 
 
 	{
-		screen->FrameTime = I_msTime();
+		static uint32_t firstFrame = 0;
+		if (firstFrame == 0)
+			firstFrame = screen->FrameTime;
+		screen->FrameTime = I_msTime() - firstFrame;
 		TexMan.UpdateAnimations(screen->FrameTime);
 		R_UpdateSky(screen->FrameTime);
 		switch (gamestate)