From 1d86d7080defdf398ba1b49bcdf17b55ee8babb4 Mon Sep 17 00:00:00 2001
From: Rachael Alexanderson <madame-rachelle@users.noreply.github.com>
Date: Thu, 8 Aug 2024 00:17:29 -0400
Subject: [PATCH] - beginning levelmeshupdater work

---
 src/gamedata/r_defs.h |  6 ++++++
 src/levelmeshhelper.h | 15 +++++++++++++++
 src/playsim/p_map.cpp |  1 +
 3 files changed, 22 insertions(+)
 create mode 100644 src/levelmeshhelper.h

diff --git a/src/gamedata/r_defs.h b/src/gamedata/r_defs.h
index 54295a12b..babb940a5 100644
--- a/src/gamedata/r_defs.h
+++ b/src/gamedata/r_defs.h
@@ -30,6 +30,7 @@
 #ifndef __R_DEFS_H__
 #define __R_DEFS_H__
 
+#include "levelmeshhelper.h"
 #include "doomdef.h"
 
 #include "m_bbox.h"
@@ -978,6 +979,7 @@ public:
 		FTextureID old = planes[pos].Texture;
 		planes[pos].Texture = tex;
 		if (floorclip && pos == floor && tex != old) AdjustFloorClip();
+		if (tex != old) LevelMeshUpdater->SectorChanged((void*)this);
 	}
 
 	double GetPlaneTexZ(int pos) const
@@ -987,7 +989,9 @@ public:
 
 	void SetPlaneTexZQuick(int pos, double val)	// For the *FakeFlat functions which do not need to have the overlap checked.
 	{
+		auto old = planes[pos].TexZ;
 		planes[pos].TexZ = val;
+		if (val != old) LevelMeshUpdater->SectorChanged((void*)this);
 	}
 
 	void SetPlaneTexZ(int pos, double val, bool dirtify = false)	// This mainly gets used by init code. The only place where it must set the vertex to dirty is the interpolation code.
@@ -1289,7 +1293,9 @@ struct side_t
 	}
 	void SetTexture(int which, FTextureID tex)
 	{
+		auto old = textures[which].texture;
 		textures[which].texture = tex;
+		if (old != tex) LevelMeshUpdater->SideChanged((void*)this);
 	}
 
 	void SetTextureXOffset(int which, double offset)
diff --git a/src/levelmeshhelper.h b/src/levelmeshhelper.h
new file mode 100644
index 000000000..616c4eac0
--- /dev/null
+++ b/src/levelmeshhelper.h
@@ -0,0 +1,15 @@
+// level mesh helper
+// this is a minimal include to keep the other source files a little bit leaner
+
+struct UpdateLevelMesh
+{
+	void SectorChanged(void *sector)
+	{
+	}
+
+	void SideChanged(void *side)
+	{
+	}
+};
+
+UpdateLevelMesh* LevelMeshUpdater;
diff --git a/src/playsim/p_map.cpp b/src/playsim/p_map.cpp
index af8df92a7..2a5cc02a4 100644
--- a/src/playsim/p_map.cpp
+++ b/src/playsim/p_map.cpp
@@ -7058,6 +7058,7 @@ bool P_ChangeSector(sector_t *sector, int crunch, double amt, int floorOrCeil, b
 
 	}
 
+	LevelMeshUpdater->SectorChanged((void*)sector);	// update levelmesh
 	return cpos.nofit;
 }