[PATCH] Add RGBA64 texture cpp for vc4 driver.

[Eric Anholt]

Nick Kreeger <nick.kreeger at gmail.com> writes:

> This patch is needed to help implement half-float texturing and
> rendering for the vc4 driver in mesa. This small patch introduces the
> cpp value for the RGBA64 texture. A future patch will include updates to
> vc4_render_cl.c to handle HDR color stores.

We'll need a GET_PARAM ioctl param to say "we support RGBA64 textures"
and use that from vc4_screen.c's format checking, otherwise new Mesa on
old kernels will try to expose RGBA64 textures and fail at rendering
time.  If we're introducing a GET_PARAM, we probably want to just do
half float rendering and texturing at the same time.
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