1 /* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 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/ClampColor>
14 #include <osg/GLExtensions>
15 #include <osg/State>
16 #include <osg/Notify>
17 #include <osg/buffered_value>
18
19
20 using namespace osg;
21
ClampColor()22 ClampColor::ClampColor():
23 _clampVertexColor(GL_FIXED_ONLY),
24 _clampFragmentColor(GL_FIXED_ONLY),
25 _clampReadColor(GL_FIXED_ONLY)
26 {
27 }
28
ClampColor(GLenum vertexMode,GLenum fragmentMode,GLenum readMode)29 ClampColor::ClampColor(GLenum vertexMode, GLenum fragmentMode, GLenum readMode):
30 _clampVertexColor(vertexMode),
31 _clampFragmentColor(fragmentMode),
32 _clampReadColor(readMode)
33 {
34 }
35
~ClampColor()36 ClampColor::~ClampColor()
37 {
38 }
39
apply(State & state) const40 void ClampColor::apply(State& state) const
41 {
42
43 // get the contextID (user defined ID of 0 upwards) for the
44 // current OpenGL context.
45 const GLExtensions* extensions = state.get<GLExtensions>();
46 if (!extensions->isClampColorSupported)
47 {
48 OSG_WARN<<"Warning: ClampColor::apply(..) failed, ClampColor is not support by OpenGL driver."<<std::endl;
49 return;
50 }
51
52 #if !defined(OSG_GL3_AVAILABLE)
53 extensions->glClampColor(GL_CLAMP_VERTEX_COLOR, _clampVertexColor);
54 extensions->glClampColor(GL_CLAMP_FRAGMENT_COLOR, _clampFragmentColor);
55 #endif
56 extensions->glClampColor(GL_CLAMP_READ_COLOR, _clampReadColor);
57 }
58