Hi,
I just implement a kind of dirty texture read back node and ran into several
problems:
As you can notice in the attached code, I had a problem with
Image::readImageFromCurrentTexture.
I have would like to read back a 2D texture but as a 1D texture is binded too
it the 1D->2d->3d->cubemap priority scheme in osg::Image
( GLenum textureMode = binding1D ? GL_TEXTURE_1D : binding2D ? GL_TEXTURE_2D
: binding3D ? GL_TEXTURE_3D : binding2DArray ? GL_TEXTURE_2D_ARRAY_EXT : 0;
)
force me to disable the 1D binding.
My proposal would be to make textureMode a parameter of
readImageFromCurrentTexture.
Further I suggest to remove Image::dirty() at the end of
readImageFromCurrentTexture (as image is read from the actual texture i don't
think it usefull to make it dirty, but i may miss a usecase)
Code:
class ImageReadBackNode:public osg::Group{
void ImageReadBackNode::setTexture(osg::Texture*tex){
//assert(tex->getImage());
class ImageReadBackNodeCallback : public osg::Camera::DrawCallback
{
osg::Texture *_texture; osg::Node *_n;
public:
ImageReadBackNodeCallback(osg::Texture3D *texture,
osg::Node*toremove) :_texture(texture), _n(toremove){ };
virtual void operator () (osg::RenderInfo& renderInfo) const
{
// get OpenGL driver to create texture from image.
_texture->apply(*renderInfo.getState());
///
glBindTexture(GL_TEXTURE_1D, 0);
// restore the original setting
glDisable(GL_TEXTURE_1D);
_texture->getImage()->readImageFromCurrentTexture(renderInfo.getContextID(),true,GL_FLOAT);
glEnable(GL_TEXTURE_1D);
///Node self removal in drawthread (dirty but seams to works:/ ..)
std::list<osg::Group*> gr;
for (int i = 0; i < _n->getNumParents();
i++)gr.push_back((_n->getParent(i)));
for (std::list<osg::Group*>::iterator it = gr.begin();
it != gr.end(); it++)
(*it)->removeChild(_n);
}
};
osg::ref_ptr<osg::Camera > cam = new osg::Camera();
cam->setFinalDrawCallback(new ImageReadBackNodeCallback(tex,this));
this->addChild(cam);
}
};
Thank you!
Any advice would be welcome
Cheers,
Julien
Code:
[/code]
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=61592#61592
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