It sounds like you are after:
Image::readImageFromCurrentTexture(..)
This will require the texture to be bound, something you can do via
Texture::apply(State&).
On 7/27/07, Brian <[EMAIL PROTECTED]> wrote:
> Hi,
>
> I was wondering what the best approach to capturing an image that has been
> rendered to texture is? In my application, I'm needing to capture frames to
> file and/or memory buffers at various intervals. In my camera node that I
> have set up, the texture that is associated has a NULL osg::Image (using
> getImage()); and I believe that is the case for all RTT examples that I have
> looked at.
>
> I imagine that I could simply bind the texture and call glReadPixels,
> however it seems to me that doing this might not give the results that I'm
> wanting which is the actual texture's image. I don't want to do a screen
> capture, per se, which is what I think that using glReadPixels would
> ultimately accomplish. Capturing the output of the texture to a buffer is
> what I need. I am hoping there is a way to do this that is already built
> into OSG.
>
> My first stab at this was to get the TextureObjectList to obtain the texture
> ID, bind that texture ID, and then call glReadPixels. I've tried the
> following code, but nothing is ever copied to the data buffer. Of course,
> my OpenGL knowledge is a bit limited in this area, so I have no idea as to
> the correctness of this approach. Any help would be greatly appreciated.
>
> osg::Image *image = tex->getImage();
> unsigned char *data = new unsigned char[512 * 512 *4];
>
> osg::Texture::TextureObjectListMap map;
>
> tex->takeTextureObjects(map);
> osg::Texture::TextureObjectList& tol = map[0];
>
> // reset the time of any uninitialized objects.
> osg::Texture::TextureObjectList::iterator iter;
> iter = tol.begin();
>
> osg::Texture::TextureObject* obj = (*iter).get();
>
> if (data && obj)
> {
> glBindTexture(GL_TEXTURE_2D, obj->_id);
> glReadPixels(0, 0, obj->_width, obj->_height, GL_RGBA,
> GL_UNSIGNED_BYTE, data);
> glBindTexture(GL_TEXTURE_2D, 0);
> }
>
>
> Thanks,
> Brian
>
>
>
>
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