From 8b585db2386d289d812ece809db32027dcdd4c3b Mon Sep 17 00:00:00 2001
From: Stuart Buchanan <stuart_d_buchanan@yahoo.co.uk>
Date: Wed, 1 Aug 2012 21:06:59 +0100
Subject: [PATCH] Allow a <parameters> section of a material definition, to
 pass parameters straight into the effect.

---
 simgear/scene/material/mat.cxx | 10 ++++++++++
 simgear/scene/material/mat.hxx |  3 +++
 2 files changed, 13 insertions(+)

diff --git a/simgear/scene/material/mat.cxx b/simgear/scene/material/mat.cxx
index 6152cc55..7f70c633 100644
--- a/simgear/scene/material/mat.cxx
+++ b/simgear/scene/material/mat.cxx
@@ -387,6 +387,13 @@ SGMaterial::read_properties(const SGReaderWriterOptions* options,
         if (name)
             glyphs[name] = new SGMaterialGlyph(glyph_nodes[i]);
     }
+    
+    // Read parameters entry, which is passed into the effect
+    if (props->hasChild("parameters")) {
+        parameters = props->getChild("parameters");
+    } else {
+        parameters = new SGPropertyNode();
+    }
 
     // Read conditions node
     const SGPropertyNode *conditionNode = props->getChild("condition");
@@ -481,7 +488,10 @@ void SGMaterial::buildEffectProperties(const SGReaderWriterOptions* options)
     ref_ptr<SGMaterialUserData> user = new SGMaterialUserData(this);
     SGPropertyNode_ptr propRoot = new SGPropertyNode();
     makeChild(propRoot, "inherits-from")->setStringValue(effect);
+    
     SGPropertyNode* paramProp = makeChild(propRoot, "parameters");
+    copyProperties(parameters, paramProp);
+    
     SGPropertyNode* materialProp = makeChild(paramProp, "material");
     makeChild(materialProp, "ambient")->setValue(SGVec4d(ambient));
     makeChild(materialProp, "diffuse")->setValue(SGVec4d(diffuse));
diff --git a/simgear/scene/material/mat.hxx b/simgear/scene/material/mat.hxx
index 7115a8ef..57b6c24c 100644
--- a/simgear/scene/material/mat.hxx
+++ b/simgear/scene/material/mat.hxx
@@ -484,6 +484,9 @@ private:
   
   // Condition, indicating when this material is active
   SGSharedPtr<const SGCondition> condition;
+  
+  // Parameters from the materials file
+  const SGPropertyNode* parameters;
 
   ////////////////////////////////////////////////////////////////////
   // Internal constructors and methods.
-- 
2.39.5