mp3butcher wrote:
> I haven't noticed the introduction of osgVolume::VolumeScene.
> It's a great feature.
> But At first glance, it seams to use an other mecanism than osg::view slave
> camera in order to copy matmodelview and matproj to the RTT camera...seams
> managed via uniforms in programs
>
> Further it seams to use a program (volume_color_depth.frag) in order to copy
> back texture stored color/depth to the framebuffer.
>
> So it bring me to the question: What is the best?:
> 1)use Render to Texture and copy back with a fragment program
> 2)use Render to renderbuffer and glBlitFrameBuffer to copyback
>
> (
> To return to my code:
> i've to set camrea graphic context (i'm dumb)
> And i put the blit on the maincamera predraw
> And i put the camera as nested_render (bad but work)
> I will post a nicer/cleaner code tomorrow to have your opinion
> )
>
> robertosfield wrote:
> > Hi Julien,
> > I am away from my computer so can't look at you whole post. You description
> > it sound rather like the osgVolume::MultiPassTechnique now part of The
> > svn/trunk version of the Osg.
> > Robert On 28 Nov 2014 19:50, "Julien Valentin" < ()> wrote:
> > > Hi,
> > > In the frame of mixed geometry/volume rendering, i would like to create
> > > depthtexture for a subgraph..this texture is used to stop forward raycast
> > > of the volume.
> > > In order to do that i would like to:
> > > 1)Render subgraph in a fbo with 3 attachements
> > > -depth to renderbuffer
> > > -depth to texture
> > > -color to renderbuffer
> > > 2)Copy back depth and color render buffers from the fbo to the frame
> > > buffer (using glblitframebuffer)
> > >
> > >
> > > Here my current code
> > >
> > > Code:
> > >
> > > class OSGMULTIGRID_EXPORT RenderDepth2Texture : public osg::Group{
> > > public:
> > > virtual bool addChild(osg::Node*n);
> > > RenderDepth2Texture();
> > > /** Copy constructor using CopyOp to manage deep vs
> > > shallow copy.*/
> > >
> > >
> > > inline osg::Texture2D*getDepthTexture()const{ return
> > > _depthtexture; }
> > > inline osg::Uniform*getDepthResolutionUniform()const{
> > > return _rdx; }
> > > void setRasterizationResolution(const osg::Vec2ui&);
> > > const osg::Vec2ui & getRasterizationResolution()const {
> > > return _resolution; }
> > >
> > > virtual void traverse(osg::NodeVisitor &nv);
> > > osg::ref_ptr<osg::Texture2D> _depthtexture,_colortexture;
> > > osg::Vec2ui _resolution;
> > > osg::ref_ptr<osg::Camera> _camera;
> > > osg::ref_ptr<osg::Uniform > _rdx;
> > > };
> > > class PreDrawFBOCallback : public osg::Camera::DrawCallback
> > > {
> > > public:
> > > PreDrawFBOCallback(osg::FrameBufferObject* fbo,
> > > osg::FrameBufferObject* source_fbo, unsigned int width, unsigned int
> > > height, osg::Texture2D *dt, osg::Texture2D *ct) :
> > > _fbo(fbo), _source_fbo(source_fbo), _depthTexture(dt),
> > > _colorTexture(ct), _width(width), _height(height) {}
> > >
> > > virtual void operator () (osg::RenderInfo& renderInfo) const
> > > {
> > > cerr << "PreDrawFBOCallback" << endl;
> > > // switching only the frame buffer attachments is
> > > actually faster than switching the framebuffer
> > > #ifdef USE_PACKED_DEPTH_STENCIL
> > > #ifdef USE_TEXTURE_RECTANGLE
> > >
> > > _fbo->setAttachment(osg::Camera::PACKED_DEPTH_STENCIL_BUFFER,
> > > osg::FrameBufferAttachment((osg::TextureRectangle*)(_depthTexture.get())));
> > > #else
> > >
> > > _fbo->setAttachment(osg::Camera::PACKED_DEPTH_STENCIL_BUFFER,
> > > osg::FrameBufferAttachment((osg::Texture2D*)(_depthTexture.get())));
> > >
> > > _fbo->setAttachment(osg::Camera::PACKED_DEPTH_STENCIL_BUFFER,
> > > osg::FrameBufferAttachment(new osg::RenderBuffer(_width, _height,
> > > GL_DEPTH24_STENCIL8_EXT)));// A16)));
> > > #endif
> > > #else
> > > #ifdef USE_TEXTURE_RECTANGLE
> > > _fbo->setAttachment(osg::Camera::DEPTH_BUFFER,
> > > osg::FrameBufferAttachment((osg::TextureRectangle*)(_depthTexture.get())));
> > > #else
> > > _fbo->setAttachment(osg::Camera::DEPTH_BUFFER,
> > > osg::FrameBufferAttachment(_depthTexture.get()));//
> > > osg::FrameBufferAttachment(new osg::RenderBuffer(_width, _height,
> > > GL_RGBA16)));
> > > #endif
> > > #endif
> > > #ifdef USE_TEXTURE_RECTANGLE
> > > _fbo->setAttachment(osg::Camera::COLOR_BUFFER0,
> > > osg::FrameBufferAttachment((osg::TextureRectangle*)(_colorTexture.get())));
> > > #else
> > > _fbo->setAttachment(osg::Camera::COLOR_BUFFER0,
> > > osg::FrameBufferAttachment((_colorTexture.get())));//
> > > osg::FrameBufferAttachment(new osg::RenderBuffer(_width, _height,
> > > GL_DEPTH_COMPONENT16_ARB)));
> > >
> > > _fbo->setAttachment(osg::Camera::COLOR_BUFFER,
> > > osg::FrameBufferAttachment(new osg::RenderBuffer(_width, _height,
> > > GL_RGBA)));// A16)));
> > > #endif
> > > /*
> > > // check if we need to do some depth buffer copying from
> > > a source FBO into the current FBO
> > > if (_source_fbo.get() != NULL)
> > > {
> > > osg::FBOExtensions* fbo_ext =
> > > osg::FBOExtensions::instance(renderInfo.getContextID(), true);
> > > bool fbo_supported = fbo_ext && fbo_ext->isSupported();
> > > if (fbo_supported && fbo_ext->glBlitFramebuffer)
> > > {
> > > // blit the depth buffer from the solid geometry fbo into
> > > the current transparency fbo
> > > (_fbo.get())->apply(*renderInfo.getState(),
> > > osg::FrameBufferObject::DRAW_FRAMEBUFFER);
> > > (_source_fbo.get())->apply(*renderInfo.getState(),
> > > osg::FrameBufferObject::READ_FRAMEBUFFER);
> > >
> > > // glReadBuffer(GL_COLOR_ATTACHMENT0_EXT); //
> > > only needed to blit the color buffer
> > > // glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT); //
> > > only needed to blit the color buffer
> > > fbo_ext->glBlitFramebuffer(
> > > 0, 0, static_cast<GLint>(_width),
> > > static_cast<GLint>(_height),
> > > 0, 0, static_cast<GLint>(_width),
> > > static_cast<GLint>(_height),
> > > #ifdef USE_PACKED_DEPTH_STENCIL
> > > GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT, GL_NEAREST);
> > > #else
> > > GL_DEPTH_BUFFER_BIT, GL_NEAREST);
> > > #endif
> > > (_fbo.get())->apply(*renderInfo.getState(),
> > > osg::FrameBufferObject::READ_FRAMEBUFFER);
> > > (_fbo.get())->apply(*renderInfo.getState(),
> > > osg::FrameBufferObject::DRAW_FRAMEBUFFER);
> > > }
> > > }*/
> > > // switch to this fbo, if it isn't already bound
> > > (_fbo.get())->apply(*renderInfo.getState());// ,
> > > osg::FrameBufferObject::READ_FRAMEBUFFER);
> > > //(_fbo.get())->apply(*renderInfo.getState(),
> > > osg::FrameBufferObject::DRAW_FRAMEBUFFER);
> > > }
> > > protected:
> > > osg::ref_ptr<osg::FrameBufferObject> _fbo;
> > > osg::ref_ptr<osg::FrameBufferObject> _source_fbo;
> > > osg::ref_ptr<osg::Texture2D> _depthTexture;
> > > osg::ref_ptr<osg::Texture2D> _colorTexture;
> > > unsigned int _width;
> > > unsigned int _height;
> > > };
> > >
> > >
> > > class PostDrawFBOCallback : public osg::Camera::DrawCallback
> > > {
> > > public:
> > > PostDrawFBOCallback(osg::FrameBufferObject* fbo,
> > > osg::FrameBufferObject* source_fbo, unsigned int width, unsigned int
> > > height, osg::Texture *dt, osg::Texture *ct) :
> > > _fbo(fbo), _width(width), _height(height) {
> > > // in order to select FrameBuffer instead of FBO
> > > _dummyfbo = new osg::FrameBufferObject();
> > > }
> > > virtual void operator () (osg::RenderInfo& renderInfo) const
> > > {
> > > cerr << "PostDrawFBOCallback" << endl;
> > > osg::FBOExtensions* fbo_ext =
> > > osg::FBOExtensions::instance(renderInfo.getContextID(), false);
> > >
> > >
> > >
> > > (_fbo.get())->apply(*renderInfo.getState(),
> > > osg::FrameBufferObject::READ_FRAMEBUFFER);
> > > (_dummyfbo.get())->apply(*renderInfo.getState(),
> > > osg::FrameBufferObject::DRAW_FRAMEBUFFER);
> > > //same as glBind(GL_DRAW_FRAMEBUFFER,0);
> > >
> > > fbo_ext->glBlitFramebuffer(
> > > 0, 0, static_cast<GLint>(_width),
> > > static_cast<GLint>(_height),
> > > 0, 0, static_cast<GLint>(_width),
> > > static_cast<GLint>(_height),
> > > GL_COLOR_BUFFER_BIT, GL_NEAREST);
> > >
> > > fbo_ext->glBlitFramebuffer(
> > > 0, 0, static_cast<GLint>(_width),
> > > static_cast<GLint>(_height),
> > > 0, 0, static_cast<GLint>(_width),
> > > static_cast<GLint>(_height),
> > > #ifdef USE_PACKED_DEPTH_STENCIL
> > > GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT,
> > > GL_NEAREST);
> > > #else
> > > GL_DEPTH_BUFFER_BIT, GL_NEAREST);
> > > #endif
> > >
> > > ///restore fbo
> > > (_dummyfbo.get())->apply(*renderInfo.getState(),
> > > osg::FrameBufferObject::READ_FRAMEBUFFER);
> > >
> > >
> > > }
> > > protected:
> > > bool _restore;
> > > protected:
> > > osg::ref_ptr<osg::FrameBufferObject> _fbo, _dummyfbo;
> > >
> > > unsigned int _width;
> > > unsigned int _height;
> > > };
> > >
> > > RenderDepth2Texture::RenderDepth2Texture() :osg::Group()
> > > {
> > >
> > > _camera = new osg::Camera();
> > > _camera->setClearColor(osg::Vec4(0, 1, 0, 1));
> > > _camera->setClearDepth(1);
> > >
> > > _camera->setAllowEventFocus(false);
> > >
> > > setCullingActive(false);
> > >
> > >
> > > _rdx = new osg::Uniform();
> > > _rdx->setName("rviewport");
> > > _rdx->setType(osg::Uniform::FLOAT_VEC2);
> > >
> > > _resolution = osg::Vec2ui(0, 0);
> > > _rdx->set(osg::Vec2f(1.0f / (float)_resolution.x(), 1.0f /
> > > (float)_resolution.y()));
> > > _colortexture = new osg::Texture2D();
> > >
> > > _colortexture->setInternalFormat(GL_RGBA);//
> > > GL_DEPTH_COMPONENT32_ARB perhaps ARB should be cool
> > > _colortexture->setSourceFormat(GL_RGBA);//RGBA
> > > _colortexture->setSourceType(GL_UNSIGNED_BYTE);//don give a shit
> > > cause its not client data
> > >
> > > _colortexture->setDataVariance(osg::Texture2D::DYNAMIC);
> > > _colortexture->setFilter(osg::Texture2D::MIN_FILTER,
> > > osg::Texture2D::NEAREST);
> > > _colortexture->setFilter(osg::Texture2D::MAG_FILTER,
> > > osg::Texture2D::NEAREST);
> > >
> > > _depthtexture = new osg::Texture2D();
> > >
> > > _depthtexture->setInternalFormat(GL_DEPTH_COMPONENT16_ARB);//
> > > GL_DEPTH_COMPONENT32_ARB perhaps ARB should be cool
> > > _depthtexture->setSourceFormat(GL_DEPTH_COMPONENT);//RGBA
> > > _depthtexture->setSourceType(GL_UNSIGNED_BYTE);//don give a shit
> > > cause its not client data
> > >
> > > _depthtexture->setDataVariance(osg::Texture2D::DYNAMIC);
> > > _depthtexture->setFilter(osg::Texture2D::MIN_FILTER,
> > > osg::Texture2D::NEAREST);
> > > _depthtexture->setFilter(osg::Texture2D::MAG_FILTER,
> > > osg::Texture2D::NEAREST);
> > > #ifdef USE_PACKED_DEPTH_STENCIL
> > > _depthtexture->setInternalFormat(GL_DEPTH24_STENCIL8_EXT);
> > > _depthtexture->setSourceFormat(GL_DEPTH_STENCIL_EXT);
> > > _depthtexture->setSourceType(GL_UNSIGNED_INT_24_8_EXT);
> > > #else
> > > _depthtexture->setInternalFormat(GL_DEPTH_COMPONENT);
> > > #endif
> > >
> > >
> > >
> > > }
> > >
> > >
> > > void RenderDepth2Texture::setRasterizationResolution(const osg::Vec2ui&
> > > size)
> > > {
> > > _resolution = size; _rdx->set(osg::Vec2f(1.0f /
> > > (float)_resolution.x(), 1.0f / (float)_resolution.y()));
> > > _rdx->dirty();
> > >
> > > _depthtexture->setTextureSize(_resolution.x(), _resolution.y());
> > > _colortexture->setTextureSize(_resolution.x(), _resolution.y());
> > > _colortexture->dirtyTextureObject();
> > > _depthtexture->dirtyTextureObject();
> > >
> > >
> > > }
> > > bool RenderDepth2Texture::addChild(osg::Node*n){
> > > osg::Group::addChild(n);//dummy node for serialisaetion
> > > return _camera->addChild(n);//real one
> > > }
> > > void RenderDepth2Texture::traverse(osg::NodeVisitor &nv)
> > > {
> > > // record the traversal mask on entry so we can reapply it later.
> > > unsigned int traversalMask = nv.getTraversalMask();
> > > if (nv.getVisitorType() == osg::NodeVisitor::CULL_VISITOR)
> > > {
> > > osgUtil::CullVisitor* cv =
> > > dynamic_cast<osgUtil::CullVisitor*>(&nv);
> > > osg::Camera*cam = cv->getCurrentCamera();
> > > osg::Camera::Attachment attach =
> > > cam->getBufferAttachmentMap()[osg::Camera::DEPTH_BUFFER];
> > >
> > > unsigned int w, h;
> > > w = cam->getViewport()->width();
> > > h = cam->getViewport()->height();
> > >
> > > if (getRasterizationResolution() != osg::Vec2ui(w, h)){
> > > //no texture resoltuion changes fuck the stuff..
> > > _resolution
> > > setRasterizationResolution
> > > (osg::Vec2ui(w, h));
> > > //_camera =
> > > (osg::Camera*)cam->clone(osg::CopyOp::DEEP_COPY_ALL);
> > > osg::ref_ptr<osg::FrameBufferObject> fbo = new
> > > osg::FrameBufferObject();
> > > _camera->setViewport(cam->getViewport());
> > >
> > > _camera->setClearColor(osg::Vec4(0, 1, 0, 0));
> > > _camera->setClearDepth(1.0f);
> > > #ifndef USE_PACKED_DEPTH_STENCIL
> > > _camera->setClearMask(GL_DEPTH_BUFFER_BIT |
> > > GL_COLOR_BUFFER_BIT);
> > > #else
> > > _camera->setClearMask(GL_DEPTH_BUFFER_BIT |
> > > GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
> > > #endif
> > > _camera->setPreDrawCallback(new
> > > PreDrawFBOCallback(fbo, 0, w, h, _depthtexture, _colortexture));
> > > _camera->setFinalDrawCallback(new
> > > PostDrawFBOCallback(fbo, 0, w, h, 0, 0));
> > >
> > >
> > > cam->getView()->addSlave(_camera, false);
> > > /*for (int i = 0; i < getNumChildren(); i++)
> > > _camera->addChild(getChild(i));
> > > */
> > >
> > > _camera->dirtyBound();
> > > this->dirtyBound(); std::cerr << "ATTACHING DEPTH
> > > TARGET TO CAMERA" << _camera->getNumChildren() << endl;
> > >
> > > }
> > >
> > >
> > >
> > > nv.apply(*_camera.get());
> > >
> > >
> > >
> > > }
> > > else nv.apply(*_camera.get());
> > >
> > > }
> > >
> > >
> > >
> > > I took osgdepthpeeling as an example but i may missed something because
> > > it s no working....I only getback the FBO clearColor to FrameBuffer as
> > > if _camera haven't any children drawn ...
> > > Note that I overload Group and delegate traversal to _camera...It's the
> > > only way i found to retrieve the main view...
> > > It's the first time I use a slave camera ...is there something i missed
> > > All help is welcome
> > >
> > > Thank you!
> > >
> > > Cheers,
> > > Julien [/code]
> > >
> > > ------------------
> > > Read this topic online here:
> > > http://forum.openscenegraph.org/viewtopic.php?p=61914#61914
> > > (http://forum.openscenegraph.org/viewtopic.php?p=61914#61914)
> > >
> > >
> > >
> > >
> > >
> > > _______________________________________________
> > > osg-users mailing list
> > > ()
> > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
> > > (http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org)
> > >
> >
> >
> > ------------------
> > Post generated by Mail2Forum
>
------------------
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http://forum.openscenegraph.org/viewtopic.php?p=61917#61917
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