Added osgFX::MultiTextureControl node for managing blending between

different texture layers.

src/osgPlugins/osgFX/IO_MultiTextureControl.cpp

@@ -0,0 +1,79 @@
+#include <osgFX/MultiTextureControl>
+
+#include <osgDB/Registry>
+#include <osgDB/Input>
+#include <osgDB/Output>
+
+bool MultiTextureControl_readLocalData(osg::Object &obj, osgDB::Input &fr);
+bool MultiTextureControl_writeLocalData(const osg::Object &obj, osgDB::Output &fw);
+
+osgDB::RegisterDotOsgWrapperProxy MultiTextureControl_Proxy
+(
+    new osgFX::MultiTextureControl,
+    "osgFX::MultiTextureControl",
+    "Object Node osgFX::MultiTextureControl Group",
+    MultiTextureControl_readLocalData,
+    MultiTextureControl_writeLocalData
+);
+
+bool MultiTextureControl_readLocalData(osg::Object &obj, osgDB::Input &fr)
+{
+    osgFX::MultiTextureControl &mtc = static_cast<osgFX::MultiTextureControl &>(obj);
+    bool iteratorAdvanced = false;
+
+    bool matchFirst = false;
+    if ((matchFirst=fr.matchSequence("TextureWeights {")) || fr.matchSequence("TextureWeights %i {"))
+    {
+
+        // set up coordinates.
+        int entry = fr[0].getNoNestedBrackets();
+        if (matchFirst)
+        {
+            fr += 2;
+        }
+        else
+        {
+            fr += 3;
+        }
+
+        float weight=0.0f;
+        unsigned int i=0;
+        while (!fr.eof() && fr[0].getNoNestedBrackets()>entry)
+        {
+            if (fr[0].getFloat(weight))
+            {
+                mtc.setTextureWeight(i,weight);
+                ++fr;
+                ++i;
+            }
+            else
+            {
+                ++fr;
+            }
+        }
+
+        iteratorAdvanced = true;
+        ++fr;
+
+    }
+
+    return iteratorAdvanced;
+}
+
+bool MultiTextureControl_writeLocalData(const osg::Object &obj, osgDB::Output &fw)
+{
+    const osgFX::MultiTextureControl &mtc = static_cast<const osgFX::MultiTextureControl &>(obj);
+
+    fw.indent() << "TextureWeights "<<mtc.getNumTextureWeights()<<" {"<< std::endl;
+    fw.moveIn();
+    
+    for(unsigned int i=0; i<mtc.getNumTextureWeights();++i)
+    {
+        fw.indent() << mtc.getTextureWeight(i)<<std::endl;
+    }
+    fw.moveOut();
+    fw.indent() << "}"<< std::endl;
+
+
+    return true;
+}