From 9b4e485686bdd679ad7d1bf578ba87cac01c8e1a Mon Sep 17 00:00:00 2001
From: Sally Coolatta <tehrealsalt@gmail.com>
Date: Wed, 27 Apr 2022 17:02:35 -0400
Subject: [PATCH] Fix frame pacing when game lags behind

The frame timestamp should've been made at the start of the frame, not the end.
---
 src/d_main.c       | 3 ++-
 src/sdl/i_system.c | 8 +++++++-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/d_main.c b/src/d_main.c
index 6aeaf61e5..eb01edd9d 100644
--- a/src/d_main.c
+++ b/src/d_main.c
@@ -755,6 +755,8 @@ void D_SRB2Loop(void)
 
 	for (;;)
 	{
+		frameEnd = I_GetFrameTime();
+
 		if (lastwipetic)
 		{
 			oldentertics = lastwipetic;
@@ -890,7 +892,6 @@ void D_SRB2Loop(void)
 		LUA_Step();
 
 		// Fully completed frame made.
-		frameEnd = I_GetFrameTime();
 		if (!singletics && !dedicated)
 		{
 			I_FrameCapSleep(frameEnd);
diff --git a/src/sdl/i_system.c b/src/sdl/i_system.c
index 2e1bf0c17..05386e9b5 100644
--- a/src/sdl/i_system.c
+++ b/src/sdl/i_system.c
@@ -2157,8 +2157,14 @@ static void UpdateElapsedTics(void)
 
 tic_t I_GetTime(void)
 {
+	float f = 0.0f;
+
 	UpdateElapsedTics();
-	return (tic_t) floor(elapsed_tics);
+
+	// This needs kept in a separate variable before converting
+	// to tic_t, due to stupid -Wbad-function-cast error.
+	f = floor(elapsed_tics);
+	return (tic_t)f;
 }
 
 float I_GetTimeFrac(void)