Added osg::DepthRangeIndexed class to wrap up glDepthRangeIndexed functionality.

include/osg/DepthRangeIndexed

@@ -0,0 +1,86 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2016 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_DepthRangeIndexed
+#define OSG_DepthRangeIndexed 1
+
+#include <osg/Depth>
+
+namespace osg {
+
+/** Encapsulates glDepthRangeIndexed function : the index version of glDepth
+*/
+class OSG_EXPORT DepthRangeIndexed : public osg::StateAttribute
+{
+    public :
+
+        DepthRangeIndexed();
+
+        DepthRangeIndexed(unsigned int index, double zNear=0.0, double zFar=1.0):
+            _index(index),
+            _zNear(zNear),
+            _zFar(zFar) {}
+
+        /** Copy constructor using CopyOp to manage deep vs shallow copy. */
+        DepthRangeIndexed(const DepthRangeIndexed& dp,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
+            StateAttribute(dp,copyop),
+            _index(dp._index),
+            _zNear(dp._zNear),
+            _zFar(dp._zFar) {}
+
+        META_StateAttribute(osg, DepthRangeIndexed, DEPTHRANGEINDEXED);
+
+        /** Return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs. */
+        virtual int compare(const StateAttribute& sa) const
+        {
+            // Check for equal types, then create the rhs variable
+            // used by the COMPARE_StateAttribute_Parameter macros below.
+            COMPARE_StateAttribute_Types(DepthRangeIndexed,sa)
+
+            COMPARE_StateAttribute_Parameter(_index);
+            COMPARE_StateAttribute_Parameter(_zNear)
+            COMPARE_StateAttribute_Parameter(_zFar)
+
+            return 0;
+        }
+
+        /** Return the buffer index as the member identifier.*/
+        virtual unsigned int getMember() const { return _index; }
+
+        /** Set the index of the DepthRangeIndexed. */
+        void setIndex(unsigned int index);
+
+        /** Get the index of the DepthRangeIndexed. */
+        unsigned int getIndex() const { return _index; }
+
+        inline void setZNear(double zNear) { _zNear=zNear; }
+        inline double getZNear() const { return _zNear; }
+
+        inline void setZFar(double zFar) { _zFar=zFar; }
+        inline double getZFar() const { return _zFar; }
+
+        virtual void apply(State& state) const;
+
+    protected:
+
+        virtual ~DepthRangeIndexed();
+
+        unsigned int    _index;
+        double          _zNear;
+        double          _zFar;
+
+};
+
+}
+
+#endif

include/osg/StateAttribute

@@ -204,6 +204,8 @@ class OSG_EXPORT StateAttribute : public Object
 
             INDIRECTDRAWBUFFERBINDING,
 
+            DEPTHRANGEINDEXED,
+
             CAPABILITY = 100
         };