Added osg::ShadeModel state attribute which encapsulates glShadeModel.

src/osg/Makefile

@@ -42,6 +42,7 @@ C++FILES = \
 	PolygonMode.cpp\
 	PolygonOffset.cpp\
 	Quat.cpp\
+	ShadeModel.cpp\
 	State.cpp\
 	StateSet.cpp\
 	Stencil.cpp \

src/osg/ShadeModel.cpp

@@ -0,0 +1,19 @@
+#include <osg/GL>
+#include <osg/ShadeModel>
+
+using namespace osg;
+
+ShadeModel::ShadeModel()
+{
+    _mode = SMOOTH;
+}
+
+
+ShadeModel::~ShadeModel()
+{
+}
+
+void ShadeModel::apply(State&) const
+{
+    glShadeModel((GLenum)_mode);
+}

src/osgGLUT/Viewer.cpp

@@ -26,6 +26,7 @@
 #include <osg/LineSegment>
 #include <osg/PolygonMode>
 #include <osg/Texture>
+#include <osg/ShadeModel>
 #include <osg/Notify>
 
 #include <osgDB/WriteFile>
@@ -852,14 +853,23 @@ void Viewer::keyboard(unsigned char key, int x, int y)
             break;
 
         case 's' :
+        {
             flat_shade = 1  - flat_shade ;
+            osg::StateSet* stateset = sceneView->getGlobalStateSet();
+            osg::ShadeModel* shademodel = dynamic_cast<osg::ShadeModel*>(stateset->getAttribute(osg::StateAttribute::SHADEMODEL));
+            if (!shademodel)
+            {
+                shademodel = new osg::ShadeModel;
+                stateset->setAttribute(shademodel,osg::StateAttribute::OVERRIDE);
+            }
+
             if( flat_shade )
-                glShadeModel( GL_FLAT );
+                shademodel->setMode( osg::ShadeModel::FLAT );
             else
-                glShadeModel( GL_SMOOTH );
-
+                shademodel->setMode( osg::ShadeModel::SMOOTH );
+            
             break;
-
+        }
         case 'S' :
         {
             osg::notify(osg::NOTICE) << "Smoothing scene..."<< std::endl;

src/osgPlugins/osg/Makefile

@@ -30,6 +30,7 @@ C++FILES = \
         PolygonMode.cpp\
         PolygonOffset.cpp\
         ReaderWriterOSG.cpp\
+        ShadeModel.cpp\
         StateSet.cpp\
         Stencil.cpp\
         Switch.cpp\

src/osgPlugins/osg/ShadeModel.cpp

@@ -0,0 +1,62 @@
+#include "osg/ShadeModel"
+
+#include "osgDB/Registry"
+#include "osgDB/Input"
+#include "osgDB/Output"
+
+using namespace osg;
+using namespace osgDB;
+
+// forward declare functions to use later.
+bool ShadeModel_readLocalData(Object& obj, Input& fr);
+bool ShadeModel_writeLocalData(const Object& obj, Output& fw);
+
+// register the read and write functions with the osgDB::Registry.
+RegisterDotOsgWrapperProxy g_ShadeModelFuncProxy
+(
+    new osg::ShadeModel,
+    "ShadeModel",
+    "Object StateAttribute ShadeModel",
+    &ShadeModel_readLocalData,
+    &ShadeModel_writeLocalData
+);
+
+
+bool ShadeModel_readLocalData(Object& obj,Input& fr)
+{
+    bool iteratorAdvanced = false;
+
+    ShadeModel& shademodel = static_cast<ShadeModel&>(obj);
+
+    if (fr[0].matchWord("mode"))
+    {
+        if (fr[1].matchWord("FLAT"))
+        {
+            shademodel.setMode(ShadeModel::FLAT);
+            fr+=2;
+            iteratorAdvanced = true;
+        }
+        else if (fr[1].matchWord("SMOOTH"))
+        {
+            shademodel.setMode(ShadeModel::SMOOTH);
+            fr+=2;
+            iteratorAdvanced = true;
+        }
+    }
+
+    return iteratorAdvanced;
+}
+
+
+bool ShadeModel_writeLocalData(const Object& obj, Output& fw)
+{
+
+    const ShadeModel& shademodel = static_cast<const ShadeModel&>(obj);
+
+    switch(shademodel.getMode())
+    {
+        case(ShadeModel::FLAT):     fw.indent() << "mode FLAT" <<std::endl; break;
+        case(ShadeModel::SMOOTH):   fw.indent() << "mode SMOOTH" <<std::endl; break;
+    }
+    return true;
+}