A little patch that makes the nv50 mesa driver use the
correct GPU values for the matching depth formats.
There doesn't seem to be Z16, but I added Z32_FLOAT to
show the tile_flags the various formats need in the page
tables.
There'd also be Z32_FLOAT_S8_UNORM (0x19, tile flags 0xe000),
but that's not yet defined in the pipe formats header,
and I actually don't know if it's even possbible to define
that cleanly the way pipe_format is laid out.
Christoph
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