I don't have time to examine the patch in detail.  One thing to keep
in mind is the i915 doesn't have T&L hardware so the vertices we send
to the chip are in window coords.  So just changing the viewport
between rendering to the two buffers probably won't be sufficient.

The Chromium project's tilesort mode basically replays a buffer of
OpenGL commands to render very large images.  It has to manipulate the
projection matrix, viewport and scissor box to achieve the effect.
Doing the same with Mesa/DRI drivers will probably require some work
in core Mesa.  Maybe this could be done with an extra T&L pipeline
stage.  But like I said, I'm a little too busy with other things to
dig into it.

-Brian

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