From a2972051a9cf8347249b989e96270506d5f921ea Mon Sep 17 00:00:00 2001
From: Anders Gidenstam <anders@gidenstam.org>
Date: Fri, 2 Sep 2011 20:26:55 +0200
Subject: [PATCH] Added an --materials-file option to select the materials file
 to use at startup.

The property /sim/rendering/materials-file can also be used for this purpose.
---
 src/Main/fg_init.cxx  | 5 +++--
 src/Main/fgviewer.cxx | 5 +++--
 src/Main/options.cxx  | 2 ++
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/src/Main/fg_init.cxx b/src/Main/fg_init.cxx
index c28c9d98e..25fe5a6f7 100644
--- a/src/Main/fg_init.cxx
+++ b/src/Main/fg_init.cxx
@@ -1362,10 +1362,11 @@ bool fgInitSubsystems() {
     ////////////////////////////////////////////////////////////////////
 
     SGPath mpath( globals->get_fg_root() );
-    mpath.append( "materials.xml" );
+    mpath.append( fgGetString("/sim/rendering/materials-file") );
     if ( ! globals->get_matlib()->load(globals->get_fg_root(), mpath.str(),
             globals->get_props()) ) {
-        SG_LOG( SG_GENERAL, SG_ALERT, "Error loading material lib!" );
+        SG_LOG( SG_GENERAL, SG_ALERT,
+                "Error loading materials file " << mpath.str() );
         exit(-1);
     }
 
diff --git a/src/Main/fgviewer.cxx b/src/Main/fgviewer.cxx
index 656836805..2f11aa66b 100644
--- a/src/Main/fgviewer.cxx
+++ b/src/Main/fgviewer.cxx
@@ -209,10 +209,11 @@ fgviewerMain(int argc, char** argv)
     // Initialize the material property subsystem.
 
     SGPath mpath( globals->get_fg_root() );
-    mpath.append( "materials.xml" );
+    mpath.append( fgGetString("/sim/rendering/materials-file") );
     if ( ! globals->get_matlib()->load(globals->get_fg_root(), mpath.str(),
             globals->get_props()) ) {
-        SG_LOG( SG_GENERAL, SG_ALERT, "Error loading material lib!" );
+        SG_LOG( SG_GENERAL, SG_ALERT,
+                "Error loading materials file " << mpath.str() );
         exit(-1);
     }
 
diff --git a/src/Main/options.cxx b/src/Main/options.cxx
index 472a4b742..172d133ea 100644
--- a/src/Main/options.cxx
+++ b/src/Main/options.cxx
@@ -215,6 +215,7 @@ fgSetDefaults ()
     fgSetBool("/sim/rendering/enhanced-lighting", false);
     fgSetBool("/sim/rendering/distance-attenuation", false);
     fgSetBool("/sim/rendering/specular-highlight", true);
+    fgSetString("/sim/rendering/materials-file", "materials.xml");
     fgSetInt("/sim/startup/xsize", 800);
     fgSetInt("/sim/startup/ysize", 600);
     fgSetInt("/sim/rendering/bits-per-pixel", 16);
@@ -1407,6 +1408,7 @@ struct OptionDesc {
     {"texture-filtering",            false, OPTION_INT,    "/sim/rendering/filtering", 1, "", 0 },
     {"disable-wireframe",            false, OPTION_BOOL,   "/sim/rendering/wireframe", false, "", 0 },
     {"enable-wireframe",             false, OPTION_BOOL,   "/sim/rendering/wireframe", true, "", 0 },
+    {"materials-file",               true,  OPTION_STRING, "/sim/rendering/materials-file", false, "", 0 },
     {"disable-terrasync",            false, OPTION_BOOL,   "/sim/terrasync/enabled", false, "", 0 },
     {"enable-terrasync",             false, OPTION_BOOL,   "/sim/terrasync/enabled", true, "", 0 },
     {"terrasync-dir",                true,  OPTION_STRING, "/sim/terrasync/scenery-dir", false, "", 0 },