From abcc6049b9bbcd6e18998cd37268c20caac7433d Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <coelckers@zdoom.fake>
Date: Sun, 21 Feb 2016 12:04:52 +0100
Subject: [PATCH] - made the z coordinate part of the CheckResults for the
 MultiBlock iterators and use these for all height checks in the iterator
 loops. This will later make it easier to support arbitrary portals with
 height displacements.

---
 src/basictypes.h |  6 ++++++
 src/p_map.cpp    |  8 ++++----
 src/p_maputl.cpp | 10 +++++++++-
 src/p_maputl.h   |  2 +-
 4 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/src/basictypes.h b/src/basictypes.h
index ea56e90937..3159de4286 100644
--- a/src/basictypes.h
+++ b/src/basictypes.h
@@ -112,6 +112,12 @@ struct fixedvec3
 		return *this;
 	}
 
+	operator fixedvec2()
+	{
+		fixedvec2 ret = { x, y };
+		return ret;
+	}
+
 };
 
 inline fixedvec2 operator +(const fixedvec2 &v1, const fixedvec2 &v2)
diff --git a/src/p_map.cpp b/src/p_map.cpp
index 66c95d4956..a7346fa17d 100644
--- a/src/p_map.cpp
+++ b/src/p_map.cpp
@@ -462,8 +462,8 @@ bool P_TeleportMove(AActor *thing, fixed_t x, fixed_t y, fixed_t z, bool telefra
 		{
 			if (!(th->flags3 & thing->flags3 & MF3_DONTOVERLAP))
 			{
-				if (z > th->Top() ||	// overhead
-					z + thing->height < th->Z())	// underneath
+				if (z > cres.position.z + th->height ||	// overhead
+					z + thing->height < cres.position.z)	// underneath
 					continue;
 			}
 		}
@@ -557,9 +557,9 @@ void P_PlayerStartStomp(AActor *actor, bool mononly)
 		if (th->player != NULL && mononly)
 			continue;
 
-		if (actor->Z() > th->Top())
+		if (actor->Z() > cres.position.z + th->height)
 			continue;        // overhead
-		if (actor->Top() < th->Z())
+		if (actor->Top() < cres.position.z)
 			continue;        // underneath
 
 		P_DamageMobj(th, actor, actor, TELEFRAG_DAMAGE, NAME_Telefrag);
diff --git a/src/p_maputl.cpp b/src/p_maputl.cpp
index 59a7b9b546..722d1a6ddd 100644
--- a/src/p_maputl.cpp
+++ b/src/p_maputl.cpp
@@ -534,6 +534,12 @@ void AActor::SetOrigin (fixed_t ix, fixed_t iy, fixed_t iz, bool moving)
 	P_FindFloorCeiling(this, FFCF_ONLYSPAWNPOS);
 }
 
+//===========================================================================
+//
+// FBlockNode - allows to link actors into multiple blocks in the blockmap
+//
+//===========================================================================
+
 FBlockNode *FBlockNode::FreeBlocks = NULL;
 
 FBlockNode *FBlockNode::Create (AActor *who, int x, int y, int group)
@@ -789,7 +795,9 @@ bool FMultiBlockLinesIterator::Next(FMultiBlockLinesIterator::CheckResult *item)
 	if (line != NULL)
 	{
 		item->line = line;
-		item->position = offset;
+		item->position.x = offset.x;
+		item->position.y = offset.y;
+		item->position.z = checkpoint.z;
 		item->portalflags = portalflags;
 		return true;
 	}
diff --git a/src/p_maputl.h b/src/p_maputl.h
index 2aacf3dd1f..11260bcbfe 100644
--- a/src/p_maputl.h
+++ b/src/p_maputl.h
@@ -220,7 +220,7 @@ public:
 	struct CheckResult
 	{
 		line_t *line;
-		fixedvec2 position;
+		fixedvec3 position;
 		int portalflags;
 	};