[Piglit] [PATCH] fbo-maxsize: Try to avoid allocating miplevels.

Eric Anholt eric at anholt.net
Mon Dec 12 18:14:35 UTC 2016

Kenneth Graunke <kenneth at whitecape.org> writes:

> A 16384x16384 RGBA8888 buffer takes 1GB of RAM.  If the driver allocates
> mipmap levels, that increases our storage requirements to 1.5GB.  The
> test doesn't use mipmapping, so this seems like a waste.
> Disabling mipmap filtering before allocating the texture provides a hint
> to the driver, suggesting that it should only allocate space for the
> base level.  Most Mesa drivers (Gallium and i965) follow this practice.
> Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>

It would probably be good for coverage if the fbo-maxsize test tested
that you could render all the way down the miptree of a maximum-sized
FBO, but given that it doesnt, this is:

Reviewed-by: Eric Anholt <eric at anholt.net>
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