Hi Carsten,
I've added the following lines at line 1438 in FBOViewport.cpp.
else if(getReadBuffer() && depthTex)
{
ImagePtr texImg = depthTex->getImage();
if((texImg->getWidth () != getStorageWidth ())
||
(texImg->getHeight() !=
getStorageHeight()) ||
(texImg->getData () == NULL ) )
{
SINFO << "FBOViewport::render: (Re)Allocating image "
<< "for read-back."
<< endLog;
texImg->set(texImg->getPixelFormat(),
getStorageWidth(),
getStorageHeight() );
}
glReadBuffer(GL_DEPTH_ATTACHMENT_EXT);
glReadPixels(0, 0,
getStorageWidth(),
getStorageHeight(),
texImg->getPixelFormat(),
texImg->getDataType(),
texImg->editData());
glReadBuffer(GL_NONE);
}
I had no chance to test yet, but I'll do tomorrow. I'm not sure about the FBO
emulation passage, as I have no idea what it should do? Do you think there has
to be something similar inserted?
Best regards,
Michael
-------- Original-Nachricht --------
> Datum: Tue, 14 Dec 2010 09:25:29 -0600
> Von: Carsten Neumann <carsten_neum...@gmx.net>
> An: opensg-users@lists.sourceforge.net
> Betreff: Re: [Opensg-users] OpenSG1.8 - FBOViewport Reading Depth Buffer
> Hello Michael,
>
> On 12/14/2010 08:34 AM, Michael Raab wrote:
> > was there a special reason why FBOViewport doesn't read back depth
> buffer values?
>
> don't think so, just nobody implemented it at the time.
>
> > Looking at the code it seems to me that changing the code around line
> 1013 - 1049 in OSGFBOViewport.cpp may do the trick, expecting that
> texturechunk internal format is something like GL_DEPTH_COMPONENT.
>
> yes, but note that lines 1013ff is the readback for emulating an FBO,
> the code path that uses a real FBO is at lines 1438ff.
>
> > What about the image format, that seems to be a litte bit more tricky.
>
> doesn't the OpenGL spec for FBOs say anything on the format/data type
> for reading the depth attachment? The FBOViewport only has to check if
> the image has a compatible format/data type to read depth data into.
> Sorry, not certain I understand the question.
>
> Cheers,
> Carsten
>
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