root/OpenSceneGraph/trunk/src/osg/Light.cpp @ 13041

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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/Light>
14#include <osg/StateSet>
15#include <osg/Notify>
16
17using namespace osg;
18
19Light::Light( void )
20{
21    init();
22}
23
24Light::Light(unsigned int lightnum)
25{
26    init();
27    _lightnum = lightnum;
28}
29
30Light::~Light( void )
31{
32}
33
34
35void Light::init( void )
36{
37    _lightnum = 0;
38    _ambient.set(0.05f,0.05f,0.05f,1.0f);
39    _diffuse.set(0.8f,0.8f,0.8f,1.0f);
40    _specular.set(0.05f,0.05f,0.05f,1.0f);
41    _position.set(0.0f,0.0f,1.0f,0.0f);
42    _direction.set(0.0f,0.0f,-1.0f);
43    _spot_exponent = 0.0f;
44    _spot_cutoff = 180.0f;
45    _constant_attenuation = 1.0f;
46    _linear_attenuation = 0.0f;
47    _quadratic_attenuation = 0.0f;
48
49    //     OSG_DEBUG << "_ambient "<<_ambient<<std::endl;
50    //     OSG_DEBUG << "_diffuse "<<_diffuse<<std::endl;
51    //     OSG_DEBUG << "_specular "<<_specular<<std::endl;
52    //     OSG_DEBUG << "_position "<<_position<<std::endl;
53    //     OSG_DEBUG << "_direction "<<_direction<<std::endl;
54    //     OSG_DEBUG << "_spot_exponent "<<_spot_exponent<<std::endl;
55    //     OSG_DEBUG << "_spot_cutoff "<<_spot_cutoff<<std::endl;
56    //     OSG_DEBUG << "_constant_attenuation "<<_constant_attenuation<<std::endl;
57    //     OSG_DEBUG << "_linear_attenuation "<<_linear_attenuation<<std::endl;
58    //     OSG_DEBUG << "_quadratic_attenuation "<<_quadratic_attenuation<<std::endl;
59}
60
61void Light::setLightNum(int num)
62{
63    if (_lightnum==num) return;
64
65    if (_parents.empty())
66    {
67        _lightnum = num;
68        return;
69    }
70
71    // take a reference to this clip plane to prevent it from going out of scope
72    // when we remove it temporarily from its parents.
73    osg::ref_ptr<Light> lightRef = this;
74
75    // copy the parents as they _parents list will be changed by the subsequent removeAttributes.
76    ParentList parents = _parents;
77
78    // remove this attribute from its parents as its position is being changed
79    // and would no longer be valid.
80    ParentList::iterator itr;
81    for(itr = parents.begin();
82        itr != parents.end();
83        ++itr)
84    {
85        osg::StateSet* stateset = *itr;
86        stateset->removeAttribute(this);
87    }
88
89    // assign the hint target
90    _lightnum = num;
91
92    // add this attribute back into its original parents with its new position
93    for(itr = parents.begin();
94        itr != parents.end();
95        ++itr)
96    {
97        osg::StateSet* stateset = *itr;
98        stateset->setAttribute(this);
99    }
100}
101
102void Light::captureLightState()
103{
104#ifdef OSG_GL_FIXED_FUNCTION_AVAILABLE
105    glGetLightfv( (GLenum)((int)GL_LIGHT0 + _lightnum), GL_AMBIENT, _ambient.ptr() );
106    glGetLightfv( (GLenum)((int)GL_LIGHT0 + _lightnum), GL_DIFFUSE, _diffuse.ptr() );
107    glGetLightfv( (GLenum)((int)GL_LIGHT0 + _lightnum), GL_SPECULAR, _specular.ptr() );
108    glGetLightfv( (GLenum)((int)GL_LIGHT0 + _lightnum), GL_POSITION, _position.ptr() );
109    glGetLightfv( (GLenum)((int)GL_LIGHT0 + _lightnum), GL_SPOT_DIRECTION, _direction.ptr() );
110    glGetLightfv( (GLenum)((int)GL_LIGHT0 + _lightnum), GL_SPOT_EXPONENT, &_spot_exponent );
111    glGetLightfv( (GLenum)((int)GL_LIGHT0 + _lightnum), GL_SPOT_CUTOFF,   &_spot_cutoff );
112    glGetLightfv( (GLenum)((int)GL_LIGHT0 + _lightnum), GL_CONSTANT_ATTENUATION,   &_constant_attenuation );
113    glGetLightfv( (GLenum)((int)GL_LIGHT0 + _lightnum), GL_LINEAR_ATTENUATION,   &_linear_attenuation );
114    glGetLightfv( (GLenum)((int)GL_LIGHT0 + _lightnum), GL_QUADRATIC_ATTENUATION,   &_quadratic_attenuation );
115#else
116    OSG_NOTICE<<"Warning: Light::captureLightState() - not supported."<<std::endl;
117#endif
118}
119
120void Light::apply(State&) const
121{
122#ifdef OSG_GL_FIXED_FUNCTION_AVAILABLE
123    glLightfv( (GLenum)((int)GL_LIGHT0 + _lightnum), GL_AMBIENT,               _ambient.ptr() );
124    glLightfv( (GLenum)((int)GL_LIGHT0 + _lightnum), GL_DIFFUSE,               _diffuse.ptr() );
125    glLightfv( (GLenum)((int)GL_LIGHT0 + _lightnum), GL_SPECULAR,              _specular.ptr() );
126    glLightfv( (GLenum)((int)GL_LIGHT0 + _lightnum), GL_POSITION,              _position.ptr() );
127    glLightfv( (GLenum)((int)GL_LIGHT0 + _lightnum), GL_SPOT_DIRECTION,        _direction.ptr() );
128    glLightf ( (GLenum)((int)GL_LIGHT0 + _lightnum), GL_SPOT_EXPONENT,         _spot_exponent );
129    glLightf ( (GLenum)((int)GL_LIGHT0 + _lightnum), GL_SPOT_CUTOFF,           _spot_cutoff );
130    glLightf ( (GLenum)((int)GL_LIGHT0 + _lightnum), GL_CONSTANT_ATTENUATION,  _constant_attenuation );
131    glLightf ( (GLenum)((int)GL_LIGHT0 + _lightnum), GL_LINEAR_ATTENUATION,    _linear_attenuation );
132    glLightf ( (GLenum)((int)GL_LIGHT0 + _lightnum), GL_QUADRATIC_ATTENUATION, _quadratic_attenuation );
133#else
134    OSG_NOTICE<<"Warning: Light::apply(State&) - not supported."<<std::endl;
135#endif
136}
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