Hello Constantin,
On 08/25/10 06:15, Constantin Müller wrote:
>> hm, it appears readback was only implemented for color attachments :( The
>> attached patch should change it to also handle depth and stencil attachments
>> (including combined ones). Can you give it a try and see if it works for
>> you, thanks!
>
> I applied the patch and added
>
> #define GL_DEPTH_STENCIL_EXT 0x84F9
> #define GL_UNSIGNED_INT_24_8_EXT 0x84FA
> #define GL_DEPTH24_STENCIL8_EXT 0x88F0
> #define GL_TEXTURE_STENCIL_SIZE_EXT 0x88F1
>
> to OSGGLEXT.h
> Now I got some invalid enumerant calls. Here is the glTrace:
> ...
> | glEndList()
> | glCallList(1)
> | glColorMask(TRUE, TRUE, TRUE, TRUE)
> | glDepthFunc(GL_LEQUAL)
> | glDepthMask(TRUE)
> | glDisable(GL_LIGHTING)
> | glDisable(GL_COLOR_MATERIAL)
> | glDepthMask(FALSE)
> | glDepthMask(TRUE)
> | glMatrixMode(GL_PROJECTION)
> | glPopMatrix()
> | glMatrixMode(GL_MODELVIEW)
> | glPopAttrib()
> | glReadBuffer(GL_COLOR_ATTACHMENT0_EXT)
> | glReadPixels(0, 0, 64, 64, GL_RGB, GL_UNSIGNED_BYTE, 073310A8)
> | glReadBuffer(GL_POINTS)
> | glGetError()
> | glReadBuffer(GL_DEPTH_STENCIL_NV)
> W! OpenGL error GL_INVALID_ENUM detected
> | glReadPixels(0, 0, 64, 64, GL_UNSIGNED_INT_24_8_NV,
> GL_UNSIGNED_BYTE, 00000000)
> W! OpenGL error GL_INVALID_OPERATION detected
> | glReadBuffer(GL_POINTS)
> | glGetError()
> | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0)
>> glDepthMask(FALSE)
>
> I'm wondering why there is an _NV at the end of GL_DEPTH_STENCIL.
I guess the constants were originally specified by a vendor (_NV)
extension and your GL debugger has those names associated with their
numeric value instead of the newer multi vendor (_EXT) names.
Your card does support the GL_EXT_packed_depth_stencil extension, right?
> Any hint or solution?
I have missed a problem with the Image creation in your last mail, sorry
- I've never tried reading back or using a packed depth stencil buffer,
so this is a learning experience for me.
Try this:
depthimage = OSG::Image::create();
depthimage->set(GL_DEPTH_STENCIL_EXT, sizex, sizey,
1, 1, 1, 0.0, NULL, GL_UNSIGNED_INT_24_8_EXT);
The format has to be DEPTH_STENCIL and the data type is
UNSIGNED_INT_24_8 according to this in the glReadPixels call, according
to this page in the book "OpenGL Extensions Guide":
<http://books.google.com/books?id=VDqw6MK5NJMC&pg=PA345&lpg=PA345&dq=opengl+read+packed+depth+stencil&source=bl&ots=VbZVa8A85P&sig=gkf46Q9UYXp8dSrIlWsMnkIJ7ao&hl=en&ei=yiR1TN6XAoH58AbpxNypBg&sa=X&oi=book_result&ct=result&resnum=8&ved=0CEAQ6AEwBw#v=onepage&q=opengl%20read%20packed%20depth%20stencil&f=false>
Cheers,
Carsten
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