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/GLExtensions>
14 #include <osg/State>
15 #include <osg/Fog>
16 #include <osg/Notify>
17
18 using namespace osg;
19
20 #ifndef GL_FOG_COORDINATE_SOURCE
21 #define GL_FOG_COORDINATE_SOURCE 0x8450
22 #endif
23
Fog()24 Fog::Fog()
25 {
26 _mode = EXP;
27 _density = 1.0f;
28 _start = 0.0f;
29 _end = 1.0f;
30 _color.set( 0.0f, 0.0f, 0.0f, 0.0f);
31 _fogCoordinateSource = FRAGMENT_DEPTH;
32 _useRadialFog = false;
33 }
34
35
~Fog()36 Fog::~Fog()
37 {
38 }
39
apply(State & state) const40 void Fog::apply(State& state) const
41 {
42 #ifdef OSG_GL_FIXED_FUNCTION_AVAILABLE
43
44 #ifdef OSG_GLES1_AVAILABLE
45 #define glFogi glFogx
46 #endif
47
48 glFogi( GL_FOG_MODE, _mode );
49
50 glFogf( GL_FOG_DENSITY, _density );
51 glFogf( GL_FOG_START, _start );
52 glFogf( GL_FOG_END, _end );
53 glFogfv( GL_FOG_COLOR, (GLfloat*)_color.ptr() );
54
55 static bool fogCoordExtensionSupported = osg::isGLExtensionSupported(state.getContextID(),"GL_EXT_fog_coord");
56 if (fogCoordExtensionSupported)
57 {
58 glFogi(GL_FOG_COORDINATE_SOURCE,_fogCoordinateSource);
59 }
60
61 static bool fogDistanceExtensionSupported = osg::isGLExtensionSupported(state.getContextID(),"GL_NV_fog_distance");
62 if (fogDistanceExtensionSupported)
63 {
64 if(_useRadialFog)
65 glFogf(GL_FOG_DISTANCE_MODE_NV, GL_EYE_RADIAL_NV);
66 else
67 glFogf(GL_FOG_DISTANCE_MODE_NV, GL_EYE_PLANE_ABSOLUTE_NV);
68 }
69
70 #else
71 OSG_NOTICE<<"Warning: Fog::apply(State&) - not supported."<<std::endl;
72 #endif
73 }
74