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Completed firt pass implementation FixedFunction and ShaderTechnique.

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This commit is contained in:
Robert Osfield
2009-01-16 16:21:54 +00:00
parent 29ac92df0e
commit 9d4b44f956
3 changed files with 49 additions and 161 deletions
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105
src/osgVolume/FixedFunctionTechnique.cpp
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@@ -28,12 +28,14 @@
using namespace osgVolume;
FixedFunctionTechnique::FixedFunctionTechnique()
FixedFunctionTechnique::FixedFunctionTechnique():
_numSlices(500)
{
}
FixedFunctionTechnique::FixedFunctionTechnique(const FixedFunctionTechnique& fft,const osg::CopyOp& copyop):
VolumeTechnique(fft,copyop)
VolumeTechnique(fft,copyop),
_numSlices(fft._numSlices)
{
}
@@ -41,7 +43,16 @@ FixedFunctionTechnique::~FixedFunctionTechnique()
{
}
osg::Node* createCube(float size,float alpha, unsigned int numSlices, float sliceEnd=1.0f)
void FixedFunctionTechnique::setNumSlices(unsigned int numSlices)
{
if (_numSlices==numSlices) return;
_numSlices = numSlices;
if (_volumeTile) _volumeTile->setDirty(true);
}
osg::Node* createCube(const osg::Vec3& center, float size, unsigned int numSlices)
{
// set up the Geometry.
@@ -49,7 +60,7 @@ osg::Node* createCube(float size,float alpha, unsigned int numSlices, float slic
float halfSize = size*0.5f;
float y = halfSize;
float dy =-size/(float)(numSlices-1)*sliceEnd;
float dy =-size/(float)(numSlices-1);
//y = -halfSize;
//dy *= 0.5;
@@ -70,7 +81,7 @@ osg::Node* createCube(float size,float alpha, unsigned int numSlices, float slic
geom->setNormalBinding(osg::Geometry::BIND_OVERALL);
osg::Vec4Array* colors = new osg::Vec4Array(1);
(*colors)[0].set(1.0f,1.0f,1.0f,alpha);
(*colors)[0].set(1.0f,1.0f,1.0f,1.0);
geom->setColorArray(colors);
geom->setColorBinding(osg::Geometry::BIND_OVERALL);
@@ -79,7 +90,7 @@ osg::Node* createCube(float size,float alpha, unsigned int numSlices, float slic
osg::Billboard* billboard = new osg::Billboard;
billboard->setMode(osg::Billboard::POINT_ROT_WORLD);
billboard->addDrawable(geom);
billboard->setPosition(0,osg::Vec3(0.0f,0.0f,0.0f));
billboard->setPosition(0,center);
return billboard;
}
@@ -136,74 +147,37 @@ void FixedFunctionTechnique::init()
osg::notify(osg::NOTICE)<<"Matrix = "<<matrix<<std::endl;
unsigned int numSlices=500;
float sliceEnd=1.0f;
float xSize = 1.0;
float ySize = 1.0;
float zSize = 1.0;
float xMultiplier = 1.0;
float yMultiplier = 1.0;
float zMultiplier = 1.0;
osg::BoundingBox bb(-xSize*0.5f,-ySize*0.5f,-zSize*0.5f,xSize*0.5f,ySize*0.5f,zSize*0.5f);
osg::Texture::FilterMode minFilter = osg::Texture::NEAREST;
osg::Texture::FilterMode magFilter = osg::Texture::NEAREST;
float maxAxis = xSize;
if (ySize > maxAxis) maxAxis = ySize;
if (zSize > maxAxis) maxAxis = zSize;
osg::Group* group = new osg::Group;
osg::Vec3d v000 = osg::Vec3d(0.0,0.0,0.0) * matrix;
osg::Vec3d v100 = osg::Vec3d(1.0,0.0,0.0) * matrix;
osg::Vec3d v010 = osg::Vec3d(0.0,1.0,0.0) * matrix;
osg::Vec3d v110 = osg::Vec3d(1.0,1.0,0.0) * matrix;
osg::TexGenNode* texgenNode_0 = new osg::TexGenNode;
texgenNode_0->setTextureUnit(0);
texgenNode_0->getTexGen()->setMode(osg::TexGen::EYE_LINEAR);
texgenNode_0->getTexGen()->setPlane(osg::TexGen::S, osg::Plane(xMultiplier/xSize,0.0f,0.0f,0.5f));
texgenNode_0->getTexGen()->setPlane(osg::TexGen::T, osg::Plane(0.0f,yMultiplier/ySize,0.0f,0.5f));
texgenNode_0->getTexGen()->setPlane(osg::TexGen::R, osg::Plane(0.0f,0.0f,zMultiplier/zSize,0.5f));
osg::Vec3d v001 = osg::Vec3d(0.0,0.0,1.0) * matrix;
osg::Vec3d v101 = osg::Vec3d(1.0,0.0,1.0) * matrix;
osg::Vec3d v011 = osg::Vec3d(0.0,1.0,1.0) * matrix;
osg::Vec3d v111 = osg::Vec3d(1.0,1.0,1.0) * matrix;
group->addChild(texgenNode_0);
float cubeSize = sqrtf(xSize*xSize+ySize*ySize+zSize*zSize);
double cubeSize = (v111-v000).length();
osg::Vec3d center = (v000+v111)*0.5;
osg::ClipNode* clipnode = new osg::ClipNode;
clipnode->addChild(createCube(cubeSize,1.0f, numSlices,sliceEnd));
clipnode->createClipBox(bb);
clipnode->addChild(createCube(center, cubeSize, _numSlices));
{
// set up the Geometry to enclose the clip volume to prevent near/far clipping from affecting billboard
osg::Geometry* geom = new osg::Geometry;
osg::Vec3Array* coords = new osg::Vec3Array();
coords->push_back(bb.corner(0));
coords->push_back(bb.corner(1));
coords->push_back(bb.corner(2));
coords->push_back(bb.corner(3));
coords->push_back(bb.corner(4));
coords->push_back(bb.corner(5));
coords->push_back(bb.corner(6));
coords->push_back(bb.corner(7));
geom->setVertexArray(coords);
osg::Vec4Array* colors = new osg::Vec4Array(1);
(*colors)[0].set(1.0f,1.0f,1.0f,1.0f);
geom->setColorArray(colors);
geom->setColorBinding(osg::Geometry::BIND_OVERALL);
geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::POINTS,0,coords->size()));
osg::Geode* geode = new osg::Geode;
geode->addDrawable(geom);
clipnode->addChild(geode);
}
clipnode->addClipPlane(new osg::ClipPlane(0, osg::Plane(v000, v011, v001)));
clipnode->addClipPlane(new osg::ClipPlane(1, osg::Plane(v100, v111, v110)));
clipnode->addClipPlane(new osg::ClipPlane(2, osg::Plane(v000, v101, v100)));
clipnode->addClipPlane(new osg::ClipPlane(3, osg::Plane(v110, v011, v010)));
clipnode->addClipPlane(new osg::ClipPlane(4, osg::Plane(v000, v110, v010)));
clipnode->addClipPlane(new osg::ClipPlane(5, osg::Plane(v001, v111, v101)));
osg::TexGenNode* texgenNode_0 = new osg::TexGenNode;
texgenNode_0->addChild(clipnode);
texgenNode_0->setTextureUnit(0);
texgenNode_0->getTexGen()->setMode(osg::TexGen::EYE_LINEAR);
texgenNode_0->getTexGen()->setPlanesFromMatrix(osg::Matrix::inverse(matrix));
osg::StateSet* stateset = texgenNode_0->getOrCreateStateSet();
@@ -254,8 +228,7 @@ void FixedFunctionTechnique::init()
stateset->setTextureAttributeAndModes(0,new osg::TexEnv(),osg::StateAttribute::ON);
_node = group;
_node = texgenNode_0;
}
void FixedFunctionTechnique::update(osgUtil::UpdateVisitor* uv)