452 lines
14 KiB
C++
452 lines
14 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2009 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 <osgVolume/MultipassTechnique>
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#include <osgVolume/VolumeTile>
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#include <osgVolume/VolumeScene>
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#include <osg/Geometry>
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#include <osg/ValueObject>
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#include <osg/io_utils>
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#include <osg/Program>
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#include <osg/Material>
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#include <osg/CullFace>
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#include <osg/TexGen>
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#include <osg/Texture1D>
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#include <osg/Texture2D>
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#include <osg/Texture3D>
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#include <osg/TransferFunction>
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#include <osgDB/ReadFile>
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#include <osgDB/WriteFile>
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namespace osgVolume
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{
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MultipassTechnique::MultipassTechnique()
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{
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}
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MultipassTechnique::MultipassTechnique(const MultipassTechnique& fft,const osg::CopyOp& copyop):
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VolumeTechnique(fft,copyop)
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{
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}
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MultipassTechnique::~MultipassTechnique()
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{
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}
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void MultipassTechnique::init()
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{
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OSG_INFO<<"MultipassTechnique::init()"<<std::endl;
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if (!_volumeTile)
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{
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OSG_NOTICE<<"MultipassTechnique::init(), error no volume tile assigned."<<std::endl;
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return;
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}
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if (_volumeTile->getLayer()==0)
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{
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OSG_NOTICE<<"MultipassTechnique::init(), error no layer assigend to volume tile."<<std::endl;
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return;
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}
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if (_volumeTile->getLayer()->getImage()==0)
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{
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OSG_NOTICE<<"MultipassTechnique::init(), error no image assigned to layer."<<std::endl;
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return;
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}
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OSG_NOTICE<<"MultipassTechnique::init() Need to set up"<<std::endl;
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CollectPropertiesVisitor cpv;
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if (_volumeTile->getLayer()->getProperty())
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{
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_volumeTile->getLayer()->getProperty()->accept(cpv);
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}
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osg::ref_ptr<osg::Geode> geode = new osg::Geode;
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{
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osg::Geometry* geom = new osg::Geometry;
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osg::Vec3Array* coords = new osg::Vec3Array(8);
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(*coords)[0] = osg::Vec3d(0.0,0.0,0.0);
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(*coords)[1] = osg::Vec3d(1.0,0.0,0.0);
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(*coords)[2] = osg::Vec3d(1.0,1.0,0.0);
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(*coords)[3] = osg::Vec3d(0.0,1.0,0.0);
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(*coords)[4] = osg::Vec3d(0.0,0.0,1.0);
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(*coords)[5] = osg::Vec3d(1.0,0.0,1.0);
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(*coords)[6] = osg::Vec3d(1.0,1.0,1.0);
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(*coords)[7] = osg::Vec3d(0.0,1.0,1.0);
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geom->setVertexArray(coords);
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osg::Vec4Array* colours = new osg::Vec4Array(1);
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(*colours)[0].set(1.0f,1.0f,1.0,1.0f);
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geom->setColorArray(colours, osg::Array::BIND_OVERALL);
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osg::DrawElementsUShort* drawElements = new osg::DrawElementsUShort(GL_QUADS);
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// bottom
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drawElements->push_back(3);
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drawElements->push_back(2);
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drawElements->push_back(1);
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drawElements->push_back(0);
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// bottom
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drawElements->push_back(7);//7623
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drawElements->push_back(6);
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drawElements->push_back(2);
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drawElements->push_back(3);
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// left
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drawElements->push_back(4);//4730
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drawElements->push_back(7);
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drawElements->push_back(3);
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drawElements->push_back(0);
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// right
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drawElements->push_back(1);//1265
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drawElements->push_back(2);
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drawElements->push_back(6);
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drawElements->push_back(5);
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// front
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drawElements->push_back(5);//5401
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drawElements->push_back(4);
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drawElements->push_back(0);
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drawElements->push_back(1);
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// top
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drawElements->push_back(4);//4567
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drawElements->push_back(5);
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drawElements->push_back(6);
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drawElements->push_back(7);
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geom->addPrimitiveSet(drawElements);
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geode->addDrawable(geom);
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}
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_transform = new osg::MatrixTransform;
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// handle locators
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Locator* masterLocator = _volumeTile->getLocator();
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Locator* layerLocator = _volumeTile->getLayer()->getLocator();
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if (!masterLocator && layerLocator) masterLocator = layerLocator;
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if (!layerLocator && masterLocator) layerLocator = masterLocator;
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osg::Matrix geometryMatrix;
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if (masterLocator)
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{
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geometryMatrix = masterLocator->getTransform();
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_transform->setMatrix(geometryMatrix);
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masterLocator->addCallback(new TransformLocatorCallback(_transform.get()));
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}
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osg::Matrix imageMatrix;
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if (layerLocator)
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{
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imageMatrix = layerLocator->getTransform();
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}
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OSG_NOTICE<<"MultipassTechnique::init() : geometryMatrix = "<<geometryMatrix<<std::endl;
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OSG_NOTICE<<"MultipassTechnique::init() : imageMatrix = "<<imageMatrix<<std::endl;
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osg::ref_ptr<osg::StateSet> stateset = _transform->getOrCreateStateSet();
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unsigned int texgenTextureUnit = 0;
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unsigned int volumeTextureUnit = 2;
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// set up uniforms
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{
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stateset->addUniform(new osg::Uniform("colorTexture",0));
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stateset->addUniform(new osg::Uniform("depthTexture",1));
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stateset->setMode(GL_ALPHA_TEST,osg::StateAttribute::ON);
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float alphaFuncValue = 0.1;
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if (cpv._isoProperty.valid())
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{
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alphaFuncValue = cpv._isoProperty->getValue();
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}
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if (cpv._sampleDensityProperty.valid())
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stateset->addUniform(cpv._sampleDensityProperty->getUniform());
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else
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stateset->addUniform(new osg::Uniform("SampleDensityValue",0.0005f));
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if (cpv._transparencyProperty.valid())
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stateset->addUniform(cpv._transparencyProperty->getUniform());
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else
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stateset->addUniform(new osg::Uniform("TransparencyValue",1.0f));
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if (cpv._afProperty.valid())
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stateset->addUniform(cpv._afProperty->getUniform());
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else
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stateset->addUniform(new osg::Uniform("AlphaFuncValue",alphaFuncValue));
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#if 1
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osg::ref_ptr<osg::TexGen> texgen = new osg::TexGen;
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texgen->setMode(osg::TexGen::OBJECT_LINEAR);
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texgen->setPlanesFromMatrix( geometryMatrix * osg::Matrix::inverse(imageMatrix));
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if (masterLocator)
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{
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osg::ref_ptr<TexGenLocatorCallback> locatorCallback = new TexGenLocatorCallback(texgen, masterLocator, layerLocator);
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masterLocator->addCallback(locatorCallback.get());
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if (masterLocator != layerLocator)
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{
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if (layerLocator) layerLocator->addCallback(locatorCallback.get());
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}
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}
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stateset->setTextureAttributeAndModes(texgenTextureUnit, texgen.get(), osg::StateAttribute::ON);
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#endif
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}
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// set up 3D texture
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osg::ref_ptr<osg::Image> image_3d = _volumeTile->getLayer()->getImage();
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osg::ref_ptr<osg::Texture3D> texture3D = new osg::Texture3D;
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{
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osg::Texture::InternalFormatMode internalFormatMode = osg::Texture::USE_IMAGE_DATA_FORMAT;
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#if 1
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osg::Texture::FilterMode minFilter = osg::Texture::LINEAR;
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osg::Texture::FilterMode magFilter = osg::Texture::LINEAR;
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#else
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osg::Texture::FilterMode minFilter = osg::Texture::NEAREST;
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osg::Texture::FilterMode magFilter = osg::Texture::NEAREST;
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#endif
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// set up the 3d texture itself,
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// note, well set the filtering up so that mip mapping is disabled,
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// gluBuild3DMipsmaps doesn't do a very good job of handled the
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// imbalanced dimensions of the 256x256x4 texture.
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texture3D->setResizeNonPowerOfTwoHint(false);
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texture3D->setFilter(osg::Texture3D::MIN_FILTER,minFilter);
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texture3D->setFilter(osg::Texture3D::MAG_FILTER, magFilter);
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texture3D->setWrap(osg::Texture3D::WRAP_R,osg::Texture3D::CLAMP_TO_BORDER);
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texture3D->setWrap(osg::Texture3D::WRAP_S,osg::Texture3D::CLAMP_TO_BORDER);
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texture3D->setWrap(osg::Texture3D::WRAP_T,osg::Texture3D::CLAMP_TO_BORDER);
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texture3D->setBorderColor(osg::Vec4(0.0,0.0,0.0,0.0));
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if (image_3d->getPixelFormat()==GL_ALPHA ||
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image_3d->getPixelFormat()==GL_LUMINANCE)
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{
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texture3D->setInternalFormatMode(osg::Texture3D::USE_USER_DEFINED_FORMAT);
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texture3D->setInternalFormat(GL_INTENSITY);
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}
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else
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{
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texture3D->setInternalFormatMode(internalFormatMode);
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}
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texture3D->setImage(image_3d);
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stateset->setTextureAttributeAndModes(volumeTextureUnit, texture3D, osg::StateAttribute::ON);
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osg::ref_ptr<osg::Uniform> baseTextureSampler = new osg::Uniform("volumeTexture", int(volumeTextureUnit));
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stateset->addUniform(baseTextureSampler.get());
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osg::ref_ptr<osg::Uniform> volumeCellSize = new osg::Uniform("volumeCellSize", osg::Vec3(1.0f/static_cast<float>(image_3d->s()),1.0f/static_cast<float>(image_3d->t()),1.0f/static_cast<float>(image_3d->r())));
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stateset->addUniform(volumeCellSize.get());
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}
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osg::ref_ptr<osg::Shader> computeRayColorShader = osgDB::readRefShaderFile(osg::Shader::FRAGMENT, "shaders/volume_compute_ray_color.frag");
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#if 0
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if (!computeRayColorShader)
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{
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#include "Shaders/volume_compute_ray_color_frag.cpp";
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computeRayColorShader = new osg::Shader(osg::Shader::FRAGMENT, volume_compute_ray_color_frag);
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}
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#endif
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// set up the renderin of the front faces
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{
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osg::ref_ptr<osg::Group> front_face_group = new osg::Group;
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front_face_group->addChild(geode.get());
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_transform->addChild(front_face_group.get());
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osg::ref_ptr<osg::StateSet> front_face_stateset = front_face_group->getOrCreateStateSet();
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front_face_stateset->setAttributeAndModes(new osg::CullFace(osg::CullFace::BACK), osg::StateAttribute::ON);
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osg::ref_ptr<osg::Program> program = new osg::Program;
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front_face_stateset->setAttribute(program);
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// get vertex shaders from source
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osg::ref_ptr<osg::Shader> vertexShader = osgDB::readRefShaderFile(osg::Shader::VERTEX, "shaders/volume_multipass_front.vert");
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if (vertexShader.valid())
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{
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program->addShader(vertexShader.get());
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}
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#if 0
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else
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{
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#include "Shaders/volume_color_depth_vert.cpp"
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program->addShader(new osg::Shader(osg::Shader::VERTEX, volume_color_depth_vert));
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}
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#endif
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// get fragment shaders from source
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osg::ref_ptr<osg::Shader> fragmentShader = osgDB::readRefShaderFile(osg::Shader::FRAGMENT, "shaders/volume_multipass_front.frag");
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if (fragmentShader.valid())
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{
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program->addShader(fragmentShader.get());
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}
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#if 0
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else
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{
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#include "Shaders/volume_color_depth_frag.cpp"
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program->addShader(new osg::Shader(osg::Shader::FRAGMENT, volume_color_depth_frag));
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}
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#endif
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if (computeRayColorShader.valid())
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{
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program->addShader(computeRayColorShader.get());
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}
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}
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// set up the rendering of the back faces
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{
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osg::ref_ptr<osg::Group> back_face_group = new osg::Group;
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back_face_group->addChild(geode.get());
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_transform->addChild(back_face_group.get());
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osg::ref_ptr<osg::StateSet> back_face_stateset = back_face_group->getOrCreateStateSet();
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back_face_stateset->setAttributeAndModes(new osg::CullFace(osg::CullFace::FRONT), osg::StateAttribute::ON);
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osg::ref_ptr<osg::Program> program = new osg::Program;
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back_face_stateset->setAttribute(program);
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// get vertex shaders from source
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osg::ref_ptr<osg::Shader> vertexShader = osgDB::readRefShaderFile(osg::Shader::VERTEX, "shaders/volume_multipass_back.vert");
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if (vertexShader.valid())
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{
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program->addShader(vertexShader.get());
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}
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#if 0
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else
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{
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#include "Shaders/volume_color_depth_vert.cpp"
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program->addShader(new osg::Shader(osg::Shader::VERTEX, volume_color_depth_vert));
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}
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#endif
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// get fragment shaders from source
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osg::ref_ptr<osg::Shader> fragmentShader = osgDB::readRefShaderFile(osg::Shader::FRAGMENT, "shaders/volume_multipass_back.frag");
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if (fragmentShader.valid())
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{
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program->addShader(fragmentShader.get());
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}
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#if 0
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else
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{
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#include "Shaders/volume_color_depth_frag.cpp"
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program->addShader(new osg::Shader(osg::Shader::FRAGMENT, volume_color_depth_frag));
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}
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#endif
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if (computeRayColorShader.valid())
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{
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program->addShader(computeRayColorShader.get());
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}
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}
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}
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void MultipassTechnique::update(osgUtil::UpdateVisitor* /*uv*/)
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{
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// OSG_NOTICE<<"MultipassTechnique:update(osgUtil::UpdateVisitor* nv):"<<std::endl;
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}
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void MultipassTechnique::cull(osgUtil::CullVisitor* cv)
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{
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std::string traversalPass;
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bool postTraversal = cv->getUserValue("VolumeSceneTraversal", traversalPass) && traversalPass=="Post";
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// OSG_NOTICE<<"MultipassTechnique::cull() traversalPass="<<traversalPass<<std::endl;
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if (postTraversal)
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{
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// OSG_NOTICE<<" OK need to handle postTraversal"<<std::endl;
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_transform->accept(*cv);
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}
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else
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{
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osg::NodePath& nodePath = cv->getNodePath();
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for(osg::NodePath::reverse_iterator itr = nodePath.rbegin();
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itr != nodePath.rend();
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++itr)
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{
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osgVolume::VolumeScene* vs = dynamic_cast<osgVolume::VolumeScene*>(*itr);
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if (vs)
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{
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vs->tileVisited(cv, getVolumeTile());
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break;
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}
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}
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}
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}
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void MultipassTechnique::cleanSceneGraph()
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{
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OSG_NOTICE<<"MultipassTechnique::cleanSceneGraph()"<<std::endl;
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}
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void MultipassTechnique::traverse(osg::NodeVisitor& nv)
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{
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// OSG_NOTICE<<"MultipassTechnique::traverse(osg::NodeVisitor& nv)"<<std::endl;
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if (!_volumeTile) return;
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// if app traversal update the frame count.
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if (nv.getVisitorType()==osg::NodeVisitor::UPDATE_VISITOR)
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{
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if (_volumeTile->getDirty()) _volumeTile->init();
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osgUtil::UpdateVisitor* uv = dynamic_cast<osgUtil::UpdateVisitor*>(&nv);
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if (uv)
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{
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update(uv);
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return;
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}
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}
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else if (nv.getVisitorType()==osg::NodeVisitor::CULL_VISITOR)
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{
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osgUtil::CullVisitor* cv = dynamic_cast<osgUtil::CullVisitor*>(&nv);
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if (cv)
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{
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cull(cv);
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return;
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}
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}
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if (_volumeTile->getDirty())
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{
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OSG_INFO<<"******* Doing init ***********"<<std::endl;
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_volumeTile->init();
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}
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}
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} // end of osgVolume namespace
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