From c19cf094a74bfc329ef58c5d664626d620c59ea1 Mon Sep 17 00:00:00 2001
From: Erik Hofman <erik@ehofman.com>
Date: Thu, 27 May 2021 15:55:02 +0200
Subject: [PATCH] Backport the code to be able to display the region name of
 the file that holds the selected material.

---
 simgear/scene/material/mat.cxx    |  8 ++++++--
 simgear/scene/material/mat.hxx    | 14 ++++++++++++--
 simgear/scene/material/matlib.cxx |  3 ++-
 3 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/simgear/scene/material/mat.cxx b/simgear/scene/material/mat.cxx
index d2b1d9cc..7ed00bde 100644
--- a/simgear/scene/material/mat.cxx
+++ b/simgear/scene/material/mat.cxx
@@ -97,11 +97,13 @@ SGMaterial::SGMaterial( const SGReaderWriterOptions* options,
                         const SGPropertyNode *props,
                         SGPropertyNode *prop_root,
                         AreaList *a,
-						SGSharedPtr<const SGCondition> c)
+                        SGSharedPtr<const SGCondition> c,
+                        const std::string& n)
 {
     init();
     areas = a;
     condition = c;
+    region = n;
     read_properties( options, props, prop_root );
     buildEffectProperties(options);
 }
@@ -110,12 +112,14 @@ SGMaterial::SGMaterial( const osgDB::Options* options,
                         const SGPropertyNode *props,
                         SGPropertyNode *prop_root,
                         AreaList *a,
-                        SGSharedPtr<const SGCondition> c)
+                        SGSharedPtr<const SGCondition> c,
+                        const std::string& n)
 {
     osg::ref_ptr<SGReaderWriterOptions> opt;
     opt = SGReaderWriterOptions::copyOrCreate(options);
     areas = a;
     condition = c;
+    region = n;
     init();
     read_properties(opt.get(), props, prop_root);
     buildEffectProperties(opt.get());
diff --git a/simgear/scene/material/mat.hxx b/simgear/scene/material/mat.hxx
index c48caf9b..e499735c 100644
--- a/simgear/scene/material/mat.hxx
+++ b/simgear/scene/material/mat.hxx
@@ -97,14 +97,16 @@ public:
              const SGPropertyNode *props,
              SGPropertyNode *prop_root,
              AreaList *a,
-			 SGSharedPtr<const SGCondition> c);
+             SGSharedPtr<const SGCondition> c,
+             const std::string& n);
 
 
   SGMaterial(const simgear::SGReaderWriterOptions*,
              const SGPropertyNode *props,
              SGPropertyNode *prop_root,
              AreaList *a,
-			 SGSharedPtr<const SGCondition> c);
+             SGSharedPtr<const SGCondition> c,
+             const std::string& n);
 
   /**
    * Destructor.
@@ -123,6 +125,11 @@ public:
   simgear::Effect* get_one_effect(int texIndex);
   simgear::Effect* get_effect();
 
+  /**
+   * Get the region Name.
+   */
+  const std::string get_region_name() const { return region; }
+
   /**
    * Get the Effect Name.
    */
@@ -487,6 +494,9 @@ private:
   SGVec4f ambient, diffuse, specular, emission;
   double shininess;
 
+  // region of this material
+  std::string region;
+
   // effect for this material
   std::string effect;
 
diff --git a/simgear/scene/material/matlib.cxx b/simgear/scene/material/matlib.cxx
index 3459d7e0..2ff1624e 100644
--- a/simgear/scene/material/matlib.cxx
+++ b/simgear/scene/material/matlib.cxx
@@ -128,12 +128,13 @@ bool SGMaterialLib::load( const SGPath &fg_root, const SGPath& mpath,
 
 		// Now build all the materials for this set of areas and conditions
 
+		const std::string region = node->getStringValue("name");
 		const simgear::PropertyList materials = node->getChildren("material");
 		simgear::PropertyList::const_iterator materials_iter = materials.begin();
 		for (; materials_iter != materials.end(); materials_iter++) {
 			const SGPropertyNode *node = materials_iter->get();
 			SGSharedPtr<SGMaterial> m =
-					new SGMaterial(options.get(), node, prop_root, arealist, condition);
+					new SGMaterial(options.get(), node, prop_root, arealist, condition, region);
 
 			std::vector<SGPropertyNode_ptr>names = node->getChildren("name");
 			for ( unsigned int j = 0; j < names.size(); j++ ) {