From dc9c7afa246f1e318e2b03cd17e6d9e39b3b2694 Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <coelckers@users.noreply.github.com>
Date: Sat, 15 Dec 2018 16:05:48 +0100
Subject: [PATCH] - reimplemented the GetRawTexture redirect.

---
 src/textures/formats/multipatchtexture.h |  2 ++
 src/textures/texture.cpp                 | 16 +++++++++++++++-
 src/textures/textures.h                  |  5 +++--
 3 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/src/textures/formats/multipatchtexture.h b/src/textures/formats/multipatchtexture.h
index f1284e0a9..3d7800832 100644
--- a/src/textures/formats/multipatchtexture.h
+++ b/src/textures/formats/multipatchtexture.h
@@ -1,4 +1,5 @@
 #pragma once
+#include "sc_man.h"
 
 //==========================================================================
 //
@@ -28,6 +29,7 @@ struct TexPart
 
 class FMultiPatchTexture : public FImageSource
 {
+	friend class FTexture;
 public:
 	FMultiPatchTexture(int w, int h, const TArray<TexPart> &parts, bool complex, bool textual);
 
diff --git a/src/textures/texture.cpp b/src/textures/texture.cpp
index ec09c3898..6f01f0e4f 100644
--- a/src/textures/texture.cpp
+++ b/src/textures/texture.cpp
@@ -50,6 +50,7 @@
 #include "swrenderer/textures/r_swtexture.h"
 #include "imagehelpers.h"
 #include "image.h"
+#include "formats/multipatchtexture.h"
 
 FTexture *CreateBrightmapTexture(FImageSource*);
 
@@ -221,7 +222,20 @@ FBitmap FTexture::GetBgraBitmap(PalEntry *remap, int *ptrans)
 
 FTexture *FTexture::GetRawTexture()
 {
-	return this;
+	if (OffsetLess) return OffsetLess;
+	// Reject anything that cannot have been a single-patch multipatch texture in vanilla.
+	auto image = static_cast<FMultiPatchTexture *>(GetImage());
+	if (bMultiPatch != 1 || UseType != ETextureType::Wall || Scale.X != 1 || Scale.Y != 1 || bWorldPanning || image == nullptr || image->NumParts != 1)
+	{
+		OffsetLess = this;
+		return this;
+	}
+	// Set up a new texture that directly references the underlying patch.
+	// From here we cannot retrieve the original texture made for it, so just create a new one.
+	FImageSource *source = image->Parts[0].Image;
+	OffsetLess = new FImageTexture(source, "");
+	TexMan.AddTexture(OffsetLess);
+	return OffsetLess;
 }
 
 void FTexture::SetScaledSize(int fitwidth, int fitheight)
diff --git a/src/textures/textures.h b/src/textures/textures.h
index d25026634..e40b9fc0a 100644
--- a/src/textures/textures.h
+++ b/src/textures/textures.h
@@ -338,7 +338,7 @@ public:
 	int GetSkyOffset() const { return SkyOffset; }
 	FTextureID GetID() const { return id; }
 	PalEntry GetSkyCapColor(bool bottom);
-	virtual FTexture *GetRawTexture();		// for FMultiPatchTexture to override
+	FTexture *GetRawTexture();
 	virtual int GetSourceLump() { return SourceLump; }	// needed by the scripted GetName method.
 	void GetGlowColor(float *data);
 	bool isGlowing() const { return bGlowing; }
@@ -371,11 +371,12 @@ protected:
 public:
 	FHardwareTextureContainer SystemTextures;
 protected:
-	//IHardwareTexture *SystemTexture[2] = { nullptr, nullptr };
 	FSoftwareTexture *SoftwareTexture = nullptr;
 
 	// None of the following pointers are owned by this texture, they are all controlled by the texture manager.
 
+	// Offset-less version for COMPATF_MASKEDMIDTEX
+	FTexture *OffsetLess = nullptr;
 	// Paletted variant
 	FTexture *PalVersion = nullptr;
 	// External hires texture