FGFS-4.1/OpenSceneGraph
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Added support for event handler for non shader path, enable alpha func

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This commit is contained in:
Robert Osfield 2008-08-25 10:38:39 +00:00
parent a2c1dc85dc
commit 94c6c9d32a
1 changed files with 38 additions and 7 deletions
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37
examples/osgvolume/osgvolume.cpp
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@ -672,7 +672,8 @@ class FollowMouseCallback : public osgGA::GUIEventHandler, public osg::StateSet:
{
public:
FollowMouseCallback()
FollowMouseCallback(bool shader = false):
_shader(shader)
{
_updateTransparency = false;
_updateAlphaCutOff = false;
@ -713,10 +714,34 @@ class FollowMouseCallback : public osgGA::GUIEventHandler, public osg::StateSet:
case(osgGA::GUIEventAdapter::DRAG):
{
float v = (ea.getY()-ea.getYmin())/(ea.getYmax()-ea.getYmin());
if (_shader)
{
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));
}
else
{
if (_updateAlphaCutOff)
{
osg::AlphaFunc* alphaFunc = dynamic_cast<osg::AlphaFunc*>(stateset->getAttribute(osg::StateAttribute::ALPHAFUNC));
if (alphaFunc)
{
alphaFunc->setReferenceValue(v);
}
}
if (_updateTransparency)
{
osg::Material* material = dynamic_cast<osg::Material*>(stateset->getAttribute(osg::StateAttribute::MATERIAL));
if (material)
{
material->setAlpha(osg::Material::FRONT_AND_BACK,v);
}
}
}
break;
}
case(osgGA::GUIEventAdapter::KEYDOWN):
@ -739,6 +764,7 @@ class FollowMouseCallback : public osgGA::GUIEventHandler, public osg::StateSet:
return false;
}
bool _shader;
bool _updateTransparency;
bool _updateAlphaCutOff;
bool _updateSampleDensity;
@ -754,7 +780,7 @@ 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);
stateset->setEventCallback(new FollowMouseCallback(true));
stateset->setMode(GL_ALPHA_TEST,osg::StateAttribute::ON);
@ -1043,9 +1069,11 @@ osg::Node* createModel(osg::ref_ptr<osg::Image>& image_3d, osg::ref_ptr<osg::Ima
osg::StateSet* stateset = texgenNode_0->getOrCreateStateSet();
stateset->setEventCallback(new FollowMouseCallback(false));
stateset->setMode(GL_LIGHTING,osg::StateAttribute::ON);
stateset->setMode(GL_BLEND,osg::StateAttribute::ON);
stateset->setAttribute(new osg::AlphaFunc(osg::AlphaFunc::GREATER,alphaFuncValue));
stateset->setAttributeAndModes(new osg::AlphaFunc(osg::AlphaFunc::GREATER,alphaFuncValue), osg::StateAttribute::ON);
osg::Material* material = new osg::Material;
material->setDiffuse(osg::Material::FRONT_AND_BACK,osg::Vec4(1.0f,1.0f,1.0f,1.0f));
@ -1085,6 +1113,7 @@ osg::Node* createModel(osg::ref_ptr<osg::Image>& image_3d, osg::ref_ptr<osg::Ima
tec->setSource0_RGB(osg::TexEnvCombine::CONSTANT);
tec->setOperand0_RGB(osg::TexEnvCombine::SRC_COLOR);
tec->setSource1_RGB(osg::TexEnvCombine::TEXTURE);
tec->setOperand1_RGB(osg::TexEnvCombine::SRC_COLOR);
tec->setCombine_Alpha(osg::TexEnvCombine::REPLACE);
@ -1497,6 +1526,8 @@ int main( int argc, char **argv )
// construct the viewer.
osgViewer::Viewer viewer(arguments);
viewer.getCamera()->setClearColor(osg::Vec4(0.0f,0.0f,0.0f,0.0f));
// if user request help write it out to cout.
if (arguments.read("-h") || arguments.read("--help"))
{