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Copy pbuffer depth

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Hey everyone, Finally got a stable pbuffer system in place, and the final thing I need to be able to do is copy the depth buffer from one pbuffer to the other. I've seen a variety of possible solutions for this. One is to use glReadPixels and glDrawPixels, but that method is WAYYYY to slow. I've also seen recommendations for NV_copy_depth_to_color (not even sure this would work). Finally, I saw someone say to use a shader to copy over the depth information. The last seems like the best solution, but I was hoping for a non-shader solution for older video cards that was still fast. Maybe such support is not necessary, but I figured it'd be nice to have. Anyways, any thoughts on the best approach to this? Thanks! ~fixxorion

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Please people...I just need to copy the depth from one pbuffer to the another, and I really can't figure it out. Any help on this would be awesome!!!

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