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

src/osg/CMakeLists.txt

@@ -66,6 +66,7 @@ SET(TARGET_H
     ${HEADER_PATH}/CullStack
     ${HEADER_PATH}/DeleteHandler
     ${HEADER_PATH}/Depth
+    ${HEADER_PATH}/DepthRangeIndexed
     ${HEADER_PATH}/DisplaySettings
     ${HEADER_PATH}/Drawable
     ${HEADER_PATH}/DrawPixels
@@ -274,6 +275,7 @@ SET(TARGET_SRC
     CullStack.cpp
     DeleteHandler.cpp
     Depth.cpp
+    DepthRangeIndexed.cpp
     DisplaySettings.cpp
     Drawable.cpp
     DrawPixels.cpp

src/osg/DepthRangeIndexed.cpp

@@ -0,0 +1,51 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2014 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/DepthRangeIndexed>
+#include <osg/GLExtensions>
+#include <osg/State>
+
+using namespace osg;
+
+DepthRangeIndexed::DepthRangeIndexed():
+    _index(0),
+    _zNear(0.0),
+    _zFar(1.0)
+{
+}
+
+DepthRangeIndexed::~DepthRangeIndexed()
+{
+}
+
+void DepthRangeIndexed::setIndex(unsigned int index)
+{
+    if (_index==index) return;
+
+    ReassignToParents needToReassingToParentsWhenMemberValueChanges(this);
+
+    _index = index;
+}
+
+void DepthRangeIndexed::apply(State& state) const
+{
+    const GLExtensions* extensions = state.get<GLExtensions>();
+    if (extensions->glDepthRangeIndexed)
+    {
+        extensions->glDepthRangeIndexed(static_cast<GLuint>(_index), static_cast<GLclampd>(_zNear), static_cast<GLclampd>(_zFar));
+    }
+    else
+    {
+        OSG_WARN<<"Warning: DepthRangeIndexed::apply(..) failed, glDepthRangeIndexed is not support by OpenGL driver."<<std::endl;
+    }
+}
+