i post my source code for more clarity.. Maybe someone already try to have
the same effect.
DepthBuffer.cpp include a main method for test.
#include "DepthBuffer.h"
#include <osgFX/Registry>
#include <osgViewer/Viewer>
#include <osgDB/ReadFile>
namespace
{
osgFX::Registry::Proxy proxy(new osgFX::DepthBuffer);
class DefaultTechnique: public osgFX::Technique
{
public:
DefaultTechnique(osg::Texture2D* tex_depth)
: osgFX::Technique(),
_tex_depth(tex_depth) {}
META_Technique("GLSL Depth Buffer", "GLSL Depth Buffer");
void getRequiredExtensions(std::vector<std::string>&
extensions) const
{
//extensions.push_back( "GL_ARB_shader_objects" );
//extensions.push_back( "GL_ARB_vertex_shader" );
//extensions.push_back( "GL_ARB_fragment_shader" );
}
protected:
void define_passes()
{
const unsigned int tex_depth_unit = 0;
osg::ref_ptr<osg::StateSet> ss = new osg::StateSet;
ss->setTextureAttributeAndModes(tex_depth_unit,
_tex_depth.get(), osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
/*
ss->setTextureMode(tex_depth_unit, GL_TEXTURE_GEN_S,
osg::StateAttribute::ON);
ss->setTextureMode(tex_depth_unit, GL_TEXTURE_GEN_T,
osg::StateAttribute::ON);
ss->setTextureMode(tex_depth_unit, GL_TEXTURE_GEN_R,
osg::StateAttribute::ON);
ss->setTextureMode(tex_depth_unit, GL_TEXTURE_GEN_Q,
osg::StateAttribute::ON);
*/
addPass(ss.get());
}
private:
osg::ref_ptr<osg::Texture2D> _tex_depth;
};
}
///////////////////////////////////////////////////////////////////////////
osgFX::DepthBuffer::DepthBuffer()
: Effect()
{
}
osgFX::DepthBuffer::DepthBuffer(const DepthBuffer& copy, const osg::CopyOp&
copyop)
: Effect(copy, copyop),
_tex_depth(static_cast<osg::Texture2D* >(copyop(copy._tex_depth.get())))
{
}
void osgFX::DepthBuffer::setUpEffect(osg::Group* root, osg::Node* object)
{
const unsigned int tex_depth_width = 1024;
const unsigned int tex_depth_height = 1024;
_tex_depth = new osg::Texture2D;
_tex_depth->setTextureSize(tex_depth_width, tex_depth_height);
_tex_depth->setInternalFormat(GL_DEPTH_COMPONENT);
//_tex_depth->setWrap(osg::Texture2D::WRAP_R,
osg::Texture2D::CLAMP_TO_BORDER);
//_tex_depth->setWrap(osg::Texture2D::WRAP_S,
osg::Texture2D::CLAMP_TO_BORDER);
//_tex_depth->setWrap(osg::Texture2D::WRAP_T,
osg::Texture2D::CLAMP_TO_BORDER);
_tex_depth->setFilter(osg::Texture2D::MIN_FILTER,
osg::Texture2D::LINEAR);
_tex_depth->setFilter(osg::Texture2D::MAG_FILTER,
osg::Texture2D::LINEAR);
osg::Camera* camera = new osg::Camera;
camera->setName("DepthBufferCamera");
camera->setClearColor( osg::Vec4(1.0f,1.0f,1.0f,1.0f) );
camera->setClearMask( GL_DEPTH_BUFFER_BIT );
camera->setReferenceFrame(osg::Camera::RELATIVE_RF);
camera->setComputeNearFarMode( osg::Camera::DO_NOT_COMPUTE_NEAR_FAR );
camera->setViewport(0, 0, tex_depth_width, tex_depth_height);
camera->setProjectionMatrix( osg::Matrix::identity() );
camera->setViewMatrix( osg::Matrix::identity() );
camera->setRenderOrder(osg::Camera::PRE_RENDER);
camera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
camera->attach(osg::Camera::DEPTH_BUFFER, _tex_depth.get());
camera->addChild( object );
root->addChild( camera );
dirtyTechniques();
}
bool osgFX::DepthBuffer::define_techniques()
{
addTechnique( new DefaultTechnique(_tex_depth.get()) );
return true;
}
int main(int argc, char *argv[])
{
osgViewer::Viewer viewer;
osg::ref_ptr<osg::Group> rootNode = new osg::Group;
osg::ref_ptr<osg::Node> objectNode = osgDB::readNodeFile("cow.osg");
osg::ref_ptr<osgFX::DepthBuffer> effect = new osgFX::DepthBuffer;
effect->setUpEffect(rootNode.get(), objectNode.get());
effect->addChild( objectNode.get() );
rootNode->addChild( effect.get() );
viewer.setSceneData( rootNode.get() );
return viewer.run();
}#ifndef _DEPTHBUFFER_HPP_
#define _DEPTHBUFFER_HPP_
#include <osgFX/Export>
#include <osgFX/Effect>
#include <osg/Texture2D>
namespace osgFX
{
class DepthBuffer : public osgFX::Effect
{
public:
DepthBuffer();
DepthBuffer(const DepthBuffer& copy, const osg::CopyOp& copyop
= osg::CopyOp::SHALLOW_COPY);
// effect class informations
META_Effect(
osgFX,
DepthBuffer,
"Depth Buffer",
"",
"");
void setUpEffect(osg::Group* root, osg::Node* object);
protected:
virtual ~DepthBuffer() {}
DepthBuffer& operator=(const DepthBuffer&) { return *this; }
bool define_techniques();
private:
osg::ref_ptr<osg::Texture2D> _tex_depth;
};
}
#endif_______________________________________________
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