Added glSissor suppor via new osg::Scissor class.

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

include/osg/Scissor

@@ -0,0 +1,110 @@
+/* -*-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.
+*/
+
+#ifndef OSG_Scissor
+#define OSG_Scissor 1
+
+#include <osg/StateAttribute>
+
+namespace osg {
+
+/** Encapsulate OpenGL glScissor. */     
+class OSG_EXPORT Scissor : public StateAttribute
+{
+    public :
+        Scissor();
+        
+        Scissor(int x,int y,int width,int height):
+            _x(x),
+            _y(y),
+            _width(width),
+            _height(height) {}
+            
+
+        /** Copy constructor using CopyOp to manage deep vs shallow copy. */
+        Scissor(const Scissor& vp,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
+            StateAttribute(vp,copyop),
+            _x(vp._x),
+            _y(vp._y),
+            _width(vp._width),
+            _height(vp._height) {}
+
+        META_StateAttribute(osg, Scissor, SCISSOR);
+        
+        /** Return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs. */
+        virtual int compare(const StateAttribute& sa) const
+        {
+            // check the types are equal and then create the rhs variable
+            // used by the COMPARE_StateAttribute_Paramter macro's below.
+            COMPARE_StateAttribute_Types(Scissor,sa)
+
+            // compare each paramter in turn against the rhs.
+            COMPARE_StateAttribute_Parameter(_x)
+            COMPARE_StateAttribute_Parameter(_y)
+            COMPARE_StateAttribute_Parameter(_width)
+            COMPARE_StateAttribute_Parameter(_height)
+            
+            return 0; // passed all the above comparison macro's, must be equal.
+        }
+
+
+        virtual bool getModeUsage(ModeUsage& usage) const
+        {
+            usage.usesMode(GL_SCISSOR_TEST);
+            return true;
+        }
+
+        inline void setScissor(int x,int y,int width,int height)
+        {
+            _x = x;
+            _y = y;
+            _width = width;
+            _height = height;
+        }
+        
+        void getScissor(int& x,int& y,int& width,int& height) const
+        {
+            x = _x;
+            y = _y;
+            width = _width;
+            height = _height;
+        }
+
+        inline int& x() { return _x; }
+        inline int x() const { return _x; }
+        
+        inline int& y() { return _y; }
+        inline int y() const { return _y; }
+
+        inline int& width() { return _width; }
+        inline int width() const { return _width; }
+
+        inline int& height() { return _height; }
+        inline int height() const { return _height; }
+
+        virtual void apply(State& state) const;
+
+    protected:
+    
+        virtual ~Scissor();
+
+        int _x;
+        int _y;
+        int _width;
+        int _height;
+
+};
+
+}
+
+#endif

include/osg/StateAttribute

@@ -149,6 +149,7 @@ class OSG_EXPORT StateAttribute : public Object
             COLORMASK,
             DEPTH,
             VIEWPORT,
+            SCISSOR,
             BLENDCOLOR,
             MULTISAMPLE,
 

include/osg/Viewport

@@ -74,9 +74,16 @@ class OSG_EXPORT Viewport : public StateAttribute
             height = _height;
         }
 
+        inline int& x() { return _x; }
         inline int x() const { return _x; }
+
+        inline int& y() { return _y; }
         inline int y() const { return _y; }
+
+        inline int& width() { return _width; }
         inline int width() const { return _width; }
+
+        inline int& height() { return _height; }
         inline int height() const { return _height; }
 
         inline bool valid() const { return _width!=0 && _height!=0; }