Added osg::BlendFunci, osg::BlendEquationi and osg::ColorMaski StateAttrirbutes that wrap the glBlendFunci, glBlendEquationi and glColorMaski functions

git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@14563 16af8721-9629-0410-8352-f15c8da7e697

src/osg/ColorMaski.cpp

@@ -0,0 +1,47 @@
+/* -*-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/ColorMaski>
+#include <osg/GLExtensions>
+#include <osg/State>
+
+using namespace osg;
+
+// Set up extensions
+ColorMaski::Extensions::Extensions(unsigned int contextID)
+{
+    setGLExtensionFuncPtr(glColorMaski, "glColorMaski", "glColorMaskiARB");
+}
+
+
+ColorMaski::ColorMaski():
+    _index(0)
+{
+}
+
+ColorMaski::~ColorMaski()
+{
+}
+
+void ColorMaski::apply(State& state) const
+{
+    const Extensions* extensions = state.get<Extensions>();
+    if (extensions->glColorMaski)
+    {
+        extensions->glColorMaski((GLboolean)_index, (GLboolean)_red,(GLboolean)_green,(GLboolean)_blue,(GLboolean)_alpha);
+    }
+    else
+    {
+        OSG_WARN<<"Warning: ColorMaski::apply(..) failed, glColorMaski is not support by OpenGL driver."<<std::endl;
+    }
+}
+