Maybe :
textureDepthStencil->setInternalFormat( GL_DEPTH_STENCIL_EXT );
...
camera->attach(osg::Camera::PACKED_DEPTH_STENCIL_BUFFER, textureDepthStencil);
Could work. As the depth and stencil buffer are packed, so should the texture.
(re)read http://www.opengl.org/registry/specs/EXT/packed_depth_stencil.txt
there is a paragraph that starts with :
In addition, a new base internal format, GL_DEPTH_STENCIL_EXT, can
be used by both texture images and renderbuffer storage. When an
image with a DEPTH_STENCIL_EXT internal format is attached to both
the depth and stencil attachment points of a framebuffer object (see
EXT_framebuffer_object), then it becomes both the depth and stencil
buffers of the framebuffer...
-Fred
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