OpenGL ES 2.x: Any way to reuse the depth buffer for screen off and on screen?

I am doing a two-pass rendering where for the first pass I pass the texture and for the second pass I render to the screen.

I am doing the same polygons in both passes, but I am using different shaders. Specifically, the second pass uses a shader that takes the texture generated by the first pass as a parameter.

Currently my first pass has a textured videobuffer to bind color and a renderbuffer to bind depth (stencil disabled), while the second pass renders a default framebuffer (0).

It occurred to me that since I am passing exactly the same polygons in pass-2, the depth buffer will be the same as my pass-1 depth buffer. If I could somehow run the pass-2 depth buffer initialized with the pass-1 depth buffer, I could then change my depth check function to GL_LEQUAL and avoid a lot of unnecessary work for the pass-2 shader. You can also disable depth recording for this pass.

So ... is there a way to do one of the following?

• create your own framebuffer that uses the screen depth buffer (but writes colors to the texture anyway)
• bind my own render to the default default framebuffer attachments.

The only workaround I can think of (and I haven't tried this yet, so I have no idea what effect this will have on performance) is for the second pass to render the texture as well, and then a third pass, which is just "blurs" the texture on the screen.