From 05a5a4be51dccf4d11489bf43cdb46ed8cd33c66 Mon Sep 17 00:00:00 2001
From: inkoalawetrust <56005600+inkoalawetrust@users.noreply.github.com>
Date: Sun, 25 Sep 2022 06:41:23 +0300
Subject: [PATCH] Added the QF_GROUNDONLY flag.

The QF_GROUNDONLY flag makes earthquakes only shake the player while they are standing on the ground.
---
 src/playsim/a_sharedglobal.h        | 1 +
 src/playsim/mapthinkers/a_quake.cpp | 2 +-
 wadsrc/static/zscript/constants.zs  | 1 +
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/playsim/a_sharedglobal.h b/src/playsim/a_sharedglobal.h
index d9497bc73..3a9a02272 100644
--- a/src/playsim/a_sharedglobal.h
+++ b/src/playsim/a_sharedglobal.h
@@ -113,6 +113,7 @@ enum
 	QF_FULLINTENSITY =	1 << 4,
 	QF_WAVE =			1 << 5,
 	QF_3D =				1 << 6,
+	QF_GROUNDONLY =		1 << 7,
 };
 
 struct FQuakeJiggers
diff --git a/src/playsim/mapthinkers/a_quake.cpp b/src/playsim/mapthinkers/a_quake.cpp
index f207a523d..ca69d305e 100644
--- a/src/playsim/mapthinkers/a_quake.cpp
+++ b/src/playsim/mapthinkers/a_quake.cpp
@@ -295,7 +295,7 @@ int DEarthquake::StaticGetQuakeIntensities(double ticFrac, AActor *victim, FQuak
 
 	while ( (quake = iterator.Next()) != nullptr)
 	{
-		if (quake->m_Spot != nullptr)
+		if (quake->m_Spot != nullptr && !(quake->m_Flags & QF_GROUNDONLY && victim->Z() > victim->floorz))
 		{
 			double dist;
 
diff --git a/wadsrc/static/zscript/constants.zs b/wadsrc/static/zscript/constants.zs
index f5fcfc33b..1887ddce1 100644
--- a/wadsrc/static/zscript/constants.zs
+++ b/wadsrc/static/zscript/constants.zs
@@ -643,6 +643,7 @@ enum EQuakeFlags
 	QF_FULLINTENSITY =	1 << 4,
 	QF_WAVE =			1 << 5,
 	QF_3D =				1 << 6,
+	QF_GROUNDONLY =		1 << 7,
 };
 
 // A_CheckProximity flags