1 /* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2014 Robert Osfield
2  *
3  * This library is open source and may be redistributed and/or modified under
4  * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
5  * (at your option) any later version.  The full license is in LICENSE file
6  * included with this distribution, and on the openscenegraph.org website.
7  *
8  * This library is distributed in the hope that it will be useful,
9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11  * OpenSceneGraph Public License for more details.
12 */
13 #include <osg/BlendFunci>
14 #include <osg/GLExtensions>
15 #include <osg/State>
16 
17 using namespace osg;
18 
19 BlendFunci::BlendFunci():
BlendFunc()20     _index(0)
21 {
22 }
23 
24 
25 BlendFunci::~BlendFunci()
26 {
27 }
BlendFunc(GLenum source,GLenum destination)28 
29 void BlendFunci::apply(State& state) const
30 {
31     const GLExtensions* extensions = state.get<GLExtensions>();
32     if (_source_factor != _source_factor_alpha ||
33         _destination_factor != _destination_factor_alpha)
34     {
35         if (extensions->glBlendFuncSeparatei)
36         {
37             extensions->glBlendFuncSeparatei(static_cast<GLuint>(_index), _source_factor, _destination_factor, _source_factor_alpha, _destination_factor_alpha);
38         }
39         else
40         {
41             OSG_WARN<<"Warning: BlendFunc::apply(..) failed, BlendFuncSeparatei is not support by OpenGL driver."<<std::endl;
42         }
43     }
44     else
45     {
46         if (extensions->glBlendFunci)
47         {
48             extensions->glBlendFunci(static_cast<GLuint>(_index), _source_factor, _destination_factor);
49         }
50         else
51         {
52             OSG_WARN<<"Warning: BlendFunc::apply(..) failed, BlendFunci is not support by OpenGL driver."<<std::endl;
53         }
54     }
55 }
56 
57