From d73d89762d0205a3a63fcc89eb8285e2c07179b9 Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <coelckers@users.noreply.github.com>
Date: Tue, 19 Jun 2018 08:32:25 +0200
Subject: [PATCH] Don't let DEarthquake depend on r_viewpoint.

The ticFrac value should be passed as a parameter, especially since this gets called from code that sets up r_viewpoint.
---
 src/g_shared/a_quake.cpp      | 14 +++++++-------
 src/g_shared/a_sharedglobal.h |  4 ++--
 src/r_utility.cpp             |  2 +-
 3 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/src/g_shared/a_quake.cpp b/src/g_shared/a_quake.cpp
index 39ffd3c79..c81e1ff28 100644
--- a/src/g_shared/a_quake.cpp
+++ b/src/g_shared/a_quake.cpp
@@ -177,9 +177,9 @@ void DEarthquake::Tick ()
 //
 //==========================================================================
 
-double DEarthquake::GetModWave(double waveMultiplier) const
+double DEarthquake::GetModWave(double ticFrac, double waveMultiplier) const
 {
-	double time = m_Countdown - r_viewpoint.TicFrac;
+	double time = m_Countdown - ticFrac;
 	return g_sin(waveMultiplier * time * (M_PI * 2 / TICRATE));
 }
 
@@ -292,7 +292,7 @@ double DEarthquake::GetFalloff(double dist) const
 //
 //==========================================================================
 
-int DEarthquake::StaticGetQuakeIntensities(AActor *victim, FQuakeJiggers &jiggers)
+int DEarthquake::StaticGetQuakeIntensities(double ticFrac, AActor *victim, FQuakeJiggers &jiggers)
 {
 	if (victim->player != NULL && (victim->player->cheats & CF_NOCLIP))
 	{
@@ -339,12 +339,12 @@ int DEarthquake::StaticGetQuakeIntensities(AActor *victim, FQuakeJiggers &jigger
 				}
 				else
 				{
-					jiggers.RollWave = r * quake->GetModWave(quake->m_RollWave) * falloff * strength;
+					jiggers.RollWave = r * quake->GetModWave(ticFrac, quake->m_RollWave) * falloff * strength;
 
 					
-					intensity.X *= quake->GetModWave(quake->m_WaveSpeed.X);
-					intensity.Y *= quake->GetModWave(quake->m_WaveSpeed.Y);
-					intensity.Z *= quake->GetModWave(quake->m_WaveSpeed.Z);
+					intensity.X *= quake->GetModWave(ticFrac, quake->m_WaveSpeed.X);
+					intensity.Y *= quake->GetModWave(ticFrac, quake->m_WaveSpeed.Y);
+					intensity.Z *= quake->GetModWave(ticFrac, quake->m_WaveSpeed.Z);
 					intensity *= strength * falloff;
 
 					// [RH] This only gives effect to the last sine quake. I would
diff --git a/src/g_shared/a_sharedglobal.h b/src/g_shared/a_sharedglobal.h
index ce2376cec..ca6c60144 100644
--- a/src/g_shared/a_sharedglobal.h
+++ b/src/g_shared/a_sharedglobal.h
@@ -145,10 +145,10 @@ public:
 	double m_RollIntensity, m_RollWave;
 
 	double GetModIntensity(double intensity, bool fake = false) const;
-	double GetModWave(double waveMultiplier) const;
+	double GetModWave(double ticFrac, double waveMultiplier) const;
 	double GetFalloff(double dist) const;
 
-	static int StaticGetQuakeIntensities(AActor *viewer, FQuakeJiggers &jiggers);
+	static int StaticGetQuakeIntensities(double ticFrac, AActor *viewer, FQuakeJiggers &jiggers);
 
 private:
 	DEarthquake ();
diff --git a/src/r_utility.cpp b/src/r_utility.cpp
index 05dafee9b..127ac4597 100644
--- a/src/r_utility.cpp
+++ b/src/r_utility.cpp
@@ -872,7 +872,7 @@ void R_SetupFrame (FRenderViewpoint &viewpoint, FViewWindow &viewwindow, AActor
 		FQuakeJiggers jiggers;
 
 		memset(&jiggers, 0, sizeof(jiggers));
-		if (DEarthquake::StaticGetQuakeIntensities(viewpoint.camera, jiggers) > 0)
+		if (DEarthquake::StaticGetQuakeIntensities(viewpoint.TicFrac, viewpoint.camera, jiggers) > 0)
 		{
 			double quakefactor = r_quakeintensity;
 			DAngle an;