Re: [PyOpenGL-Users] Reading Depth Component - not working anymore?

[Hart's A. <bha...@ya...>]

--- "Mike C. Fletcher" <mcf...@vr...> wrote:

> Hart's Antler wrote:
> > I am using the latest pyopengl (ctypes based) release for Ubuntu Gusty.  I am unable to read
> the
> > zbuffer using glreadpixels GL_DEPTH_COMPONENT, my function had worked before with the much
> older
> > pyopengl2.x series.  I'm not sure if this is a bug in new ctypes-pyopengl or is it my ATI
> drivers
> > not supporting that feature.  I'm wondering if anybody has had any luck doing this?  One note
> is
> > that i can read the zbuffer directly into a texture (for shadows) with no problem using
> glCopyTexSub2d.
> >   
> If you can send me a sample script that demonstrates the problem I can
> far more easily fix the bug.  It does sound like a bug, incidentally.
> The image handling code is completely rewritten, so it's not unlikely
> there would be differences between the old and new implementations.
> 

i dont have a stripped down example, but the code is just 3 lines you can insert into any pyopengl
demo.
data = glReadPixels(0,0,x,y, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE) # note x,y are screen size
img = Image.fromstring( 'L', (x,y), data )  # requires PIL
img.save( 'z.bmp' )  # when you open z.bmp you will find that it is blank - all white.



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