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Added event handler to shader code so that alphaCuttOff, transparency and

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sampleDensity are controlled via 'a', 't' and 'd' respectively.
This commit is contained in:
Robert Osfield 2005-09-05 13:19:20 +00:00
parent efc4f2436f
commit b8d7a3bf44
1 changed files with 87 additions and 1 deletions
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88
examples/osgvolume/osgvolume.cpp
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@ -21,6 +21,8 @@
#include <osgDB/FileUtils>
#include <osgDB/FileNameUtils>
#include <osgGA/EventVisitor>
#include <osgUtil/CullVisitor>
#include <osgProducer/Viewer>
@ -640,6 +642,88 @@ osg::Node* createCube(float size,float alpha, unsigned int numSlices, float slic
return billboard;
}
class FollowMouseCallback : public osgGA::GUIEventHandler, public osg::StateSet::Callback
{
public:
FollowMouseCallback()
{
_updateTransparency = false;
_updateAlphaCutOff = false;
_updateSampleDensity = false;
}
FollowMouseCallback(const FollowMouseCallback&,const osg::CopyOp&) {}
META_Object(osg,FollowMouseCallback);
virtual void operator() (osg::StateSet* stateset, osg::NodeVisitor* nv)
{
osgGA::EventVisitor* ev = dynamic_cast<osgGA::EventVisitor*>(nv);
if (nv->getVisitorType()==osg::NodeVisitor::EVENT_VISITOR || ev)
{
if (ev)
{
osgGA::GUIActionAdapter* aa = ev->getActionAdapter();
osgGA::EventVisitor::EventList& events = ev->getEventList();
for(osgGA::EventVisitor::EventList::iterator itr=events.begin();
itr!=events.end();
++itr)
{
handle(*(*itr), *aa, stateset, ev);
}
}
}
}
virtual bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter&, osg::Object* object, osg::NodeVisitor*)
{
osg::StateSet* stateset = dynamic_cast<osg::StateSet*>(object);
if (!stateset) return false;
switch(ea.getEventType())
{
case(osgGA::GUIEventAdapter::MOVE):
case(osgGA::GUIEventAdapter::DRAG):
{
float v = ea.getY()*0.5f+0.5f;
osg::Uniform* uniform = 0;
if (_updateTransparency && (uniform = stateset->getUniform("transparency"))) uniform->set(v);
if (_updateAlphaCutOff && (uniform = stateset->getUniform("alphaCutOff"))) uniform->set(v);
if (_updateSampleDensity && (uniform = stateset->getUniform("sampleDensity"))) uniform->set(powf(v,5));
break;
}
case(osgGA::GUIEventAdapter::KEYDOWN):
{
if (ea.getKey()=='t') _updateTransparency = true;
if (ea.getKey()=='a') _updateAlphaCutOff = true;
if (ea.getKey()=='d') _updateSampleDensity = true;
break;
}
case(osgGA::GUIEventAdapter::KEYUP):
{
if (ea.getKey()=='t') _updateTransparency = false;
if (ea.getKey()=='a') _updateAlphaCutOff = false;
if (ea.getKey()=='d') _updateSampleDensity = false;
break;
}
default:
break;
}
return false;
}
virtual void accept(osgGA::GUIEventHandlerVisitor& v)
{
v.visit(*this);
}
bool _updateTransparency;
bool _updateAlphaCutOff;
bool _updateSampleDensity;
};
osg::Node* createShaderModel(osg::ref_ptr<osg::Image>& image_3d, osg::ref_ptr<osg::Image>& normalmap_3d,
osg::Texture::InternalFormatMode internalFormatMode,
float xSize, float ySize, float zSize,
@ -649,6 +733,8 @@ osg::Node* createShaderModel(osg::ref_ptr<osg::Image>& image_3d, osg::ref_ptr<os
osg::Geode* geode = new osg::Geode;
osg::StateSet* stateset = geode->getOrCreateStateSet();
stateset->setEventCallback(new FollowMouseCallback);
// set up the 3d texture itself,
// note, well set the filtering up so that mip mapping is disabled,
// gluBuild3DMipsmaps doesn't do a very good job of handled the
@ -748,7 +834,7 @@ osg::Node* createShaderModel(osg::ref_ptr<osg::Image>& image_3d, osg::ref_ptr<os
osg::Uniform* baseTextureSampler = new osg::Uniform("baseTexture",0);
stateset->addUniform(baseTextureSampler);
osg::Uniform* sampleDensity = new osg::Uniform("sampleDensity", 1.0f/(float)numSlices);
osg::Uniform* sampleDensity = new osg::Uniform("sampleDensity", 0.01f);
stateset->addUniform(sampleDensity);
osg::Uniform* transpancy = new osg::Uniform("transparency",0.5f);