Initial revision

src/osg/PolygonOffset.cpp

@@ -0,0 +1,85 @@
+#include "osg/GL"
+#include "osg/PolygonOffset"
+#include "osg/Input"
+#include "osg/Output"
+
+using namespace osg;
+
+
+PolygonOffset::PolygonOffset( void )
+{
+    _factor = 0.0f; // are these sensible defaut values?
+    _units = 0.0f;
+}
+
+
+PolygonOffset::~PolygonOffset( void )
+{
+}
+
+
+PolygonOffset* PolygonOffset::instance()
+{
+    static ref_ptr<PolygonOffset> s_PolygonOffset(new PolygonOffset);
+    return s_PolygonOffset.get();
+}
+
+void PolygonOffset::setOffset(float factor,float units)
+{
+    _factor = factor;
+    _units = units;
+}
+
+void PolygonOffset::enable( void )
+{
+    glEnable( GL_POLYGON_OFFSET_FILL);
+    glEnable( GL_POLYGON_OFFSET_LINE);
+    glEnable( GL_POLYGON_OFFSET_POINT);
+}
+
+
+void PolygonOffset::disable( void )
+{
+    glDisable( GL_POLYGON_OFFSET_FILL);
+    glDisable( GL_POLYGON_OFFSET_LINE);
+    glDisable( GL_POLYGON_OFFSET_POINT);
+}
+
+void PolygonOffset::apply( void )
+{
+    glPolygonOffset(_factor,_units);
+}
+
+bool PolygonOffset::readLocalData(Input& fr)
+{
+    bool iteratorAdvanced = false;
+
+    float data;
+    if (fr[0].matchWord("factor") && fr[1].getFloat(data))
+    {
+
+        _factor = data;
+        fr+=2;
+        iteratorAdvanced = true;
+    }
+
+    if (fr[0].matchWord("units") && fr[1].getFloat(data))
+    {
+
+        _units = data;
+        fr+=2;
+        iteratorAdvanced = true;
+    }
+
+    return iteratorAdvanced;
+}
+
+
+bool PolygonOffset::writeLocalData(Output& fw)
+{
+    fw.indent() << "factor " << _factor << endl;
+    fw.indent() << "units  " << _units << endl;
+    return true;
+}
+
+