From a15e5399fa5227224b022ee20a053eeca715e50a Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <coelckers@users.noreply.github.com>
Date: Mon, 27 Dec 2021 23:14:16 +0100
Subject: [PATCH] - don't use a full sector backup in the triangulator for
 comparing changes.

Instead use a smaller struct only containing the relevant data.
---
 source/core/sectorgeometry.cpp |  6 +-----
 source/core/sectorgeometry.h   | 31 ++++++++++++++++++++++++++++++-
 2 files changed, 31 insertions(+), 6 deletions(-)

diff --git a/source/core/sectorgeometry.cpp b/source/core/sectorgeometry.cpp
index 28def5e2a..20aa82271 100644
--- a/source/core/sectorgeometry.cpp
+++ b/source/core/sectorgeometry.cpp
@@ -379,11 +379,7 @@ bool SectionGeometry::ValidateSection(Section* section, int plane)
 
 		section->dirty &= ~EDirty::CeilingDirty;
 	}
-#ifdef SECTOR_HACKJOB
-	memcpy(compare, sec, sizeof(*sec));
-#else
-	*compare = *sec;
-#endif
+	compare->copy(sec);
 	sdata.poscompare[plane] = sec->firstWall()->pos;
 	sdata.poscompare2[plane] = sec->firstWall()->point2Wall()->pos;
 	return false;
diff --git a/source/core/sectorgeometry.h b/source/core/sectorgeometry.h
index 269b94bfa..a1afb18b1 100644
--- a/source/core/sectorgeometry.h
+++ b/source/core/sectorgeometry.h
@@ -23,12 +23,41 @@ enum GeomFlags
 
 using SectionGeometryPlane = SectorGeometryPlane;
 
+struct sectortypelight
+{
+	float ceilingxpan_;
+	float ceilingypan_;
+	float floorxpan_;
+	float floorypan_;
+
+	ESectorFlags ceilingstat;
+	ESectorFlags floorstat;
+	int16_t ceilingpicnum;
+	int16_t ceilingheinum;
+	int16_t floorpicnum;
+	int16_t floorheinum;
+
+	void copy(sectortype* sec)
+	{
+		ceilingxpan_ = sec->ceilingxpan_;
+		ceilingypan_ = sec->ceilingypan_;
+		floorxpan_ = sec->floorxpan_;
+		floorypan_ = sec->floorypan_;
+		ceilingstat = sec->ceilingstat;
+		floorstat = sec->floorstat;
+		ceilingheinum = sec->ceilingheinum;
+		floorheinum = sec->floorheinum;
+		ceilingpicnum = sec->ceilingpicnum;
+		floorpicnum = sec->floorpicnum;
+	}
+};
+
 struct SectionGeometryData
 {
 	SectorGeometryPlane planes[2];
 	TArray<FVector2> meshVertices;	// flat vertices. Stored separately so that plane changes won't require completely new triangulation.
 	TArray<int> meshIndices;
-	sectortype compare[2] = {};
+	sectortypelight compare[2] = {};
 	vec2_t poscompare[2] = {};
 	vec2_t poscompare2[2] = {};
 	FVector3 normal[2];