Added osg::ViewportIndexed that adds support for glViewportIndexed

src/osg/ViewportIndexed.cpp

@@ -0,0 +1,53 @@
+/* -*-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/ViewportIndexed>
+#include <osg/GLExtensions>
+#include <osg/State>
+
+using namespace osg;
+
+ViewportIndexed::ViewportIndexed():
+    _index(0)
+{
+}
+
+ViewportIndexed::~ViewportIndexed()
+{
+}
+
+void ViewportIndexed::setIndex(unsigned int index)
+{
+    if (_index==index) return;
+
+    ReassignToParents needToReassingToParentsWhenMemberValueChanges(this);
+
+    _index = index;
+}
+
+void ViewportIndexed::apply(State& state) const
+{
+    const GLExtensions* extensions = state.get<GLExtensions>();
+    if (extensions->glViewportIndexedf)
+    {
+        extensions->glViewportIndexedf(static_cast<GLuint>(_index),
+                                       static_cast<GLfloat>(_x),
+                                       static_cast<GLfloat>(_y),
+                                       static_cast<GLfloat>(_width),
+                                       static_cast<GLfloat>(_height));
+    }
+    else
+    {
+        OSG_WARN<<"Warning: ViewportIndexed::apply(..) failed, glViewportIndexed is not support by OpenGL driver."<<std::endl;
+    }
+}
+