79 lines
2.1 KiB
C++
79 lines
2.1 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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#include <osg/LightSource>
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using namespace osg;
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LightSource::LightSource():
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_value(StateAttribute::ON),
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_referenceFrame(RELATIVE_TO_PARENTS)
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{
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// switch off culling of light source nodes by default.
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setCullingActive(false);
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_stateset = new StateSet;
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_light = new Light;
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}
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LightSource::~LightSource()
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{
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// ref_ptr<> automactially decrements the reference count of attached lights.
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}
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void LightSource::setReferenceFrame(ReferenceFrame rf)
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{
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_referenceFrame = rf;
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setCullingActive(_referenceFrame==RELATIVE_TO_PARENTS);
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}
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void LightSource::setLight(Light* light)
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{
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_light = light;
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setLocalStateSetModes(_value);
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}
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// Set the GLModes on StateSet associated with the ClipPlanes.
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void LightSource::setStateSetModes(StateSet& stateset,StateAttribute::GLModeValue value) const
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{
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if (_light.valid())
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{
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stateset.setAssociatedModes(_light.get(),value);
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}
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}
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void LightSource::setLocalStateSetModes(StateAttribute::GLModeValue value)
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{
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if (!_stateset) _stateset = new StateSet;
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_stateset->setAllToInherit();
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setStateSetModes(*_stateset,value);
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}
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bool LightSource::computeBound() const
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{
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Group::computeBound();
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if (_light.valid() && _referenceFrame==RELATIVE_TO_PARENTS)
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{
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const Vec4& pos = _light->getPosition();
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if (pos[3]!=0.0f)
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{
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float div = 1.0f/pos[3];
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_bsphere.expandBy(Vec3(pos[0]*div,pos[1]*div,pos[2]*div));
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}
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}
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_bsphere_computed = true;
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return true;
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}
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