Added glSissor suppor via new osg::Scissor class.

Added .osg support for osg::Scissor.
Added .ive support for osg::Viewport and osg::Scissor.

src/osg/GNUmakefile

@@ -80,6 +80,7 @@ CXXFILES =\
 	ProxyNode.cpp\
 	Quat.cpp\
 	Referenced.cpp\
+	Scissor.cpp\
 	Sequence.cpp\
 	ShadeModel.cpp\
 	Shader.cpp\

src/osg/Scissor.cpp

@@ -0,0 +1,34 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2005 Robert Osfield 
+ *
+ * This library is open source and may be redistributed and/or modified under  
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
+ * OpenSceneGraph Public License for more details.
+*/
+#include <osg/Scissor>
+
+using namespace osg;
+
+Scissor::Scissor()
+{
+    _x = 0;
+    _y = 0;
+    _width = 800;
+    _height = 600;
+}
+
+
+Scissor::~Scissor()
+{
+}
+
+void Scissor::apply(State&) const
+{
+    glScissor(_x,_y,_width,_height);
+}
+